Patent Grant
9909733
This application claims the benefit of priority of Japanese Patent Application Number 2014-098146, filed May 9, 2014, Japanese Patent Application Number 2014-098158, filed May 9, 2014, and Japanese Patent Application Number 2014-098144, filed May 9, 2014, the entire content of which is hereby incorporated by reference.
1. Field of the Invention
The present disclosure relates to a lighting apparatus and an automobile including the lighting apparatus.
2. Description of the Related Art
Vehicles such as automobiles are equipped with headlights in the front. These headlights include a housing (chassis) and a lighting apparatus attached to the housing.
Lighting apparatuses used in vehicle headlights include, for example, a base, a low beam light emitting device and a high beam light emitting device disposed on the base, and a lens positioned in front of the low beam light emitting device and the high beam light emitting device (see Japanese Unexamined Patent Application Publication No. 2005-108554).
Examples of conventional low beam light emitting devices and high beam light emitting devices used include high intensity discharge (HID) lamps. In recent years, due to the luminous efficiency and long lifespan of light emitting diodes (LEDs), which exceed HID lamps, lighting apparatuses using LEDs as the low beam light emitting devices and high beam light emitting devices have been researched and developed.
Vehicle lighting apparatuses include two light emitting devices (light sources)—a low beam light emitting device and a high beam light emitting device. For this reason, lighting apparatuses are optically designed so that the two light emitting devices each illuminate a prescribed area only. However, light from the low beam light emitting device may leak toward the high beam, which results in light leaking outside the prescribed area to be illuminated.
An object of the present disclosure is to provide a lighting apparatus and automobile with which light leak can be reduced and lighting efficiency can be increased.
In order to achieve the aforementioned object, according to one aspect of the present disclosure, a lighting apparatus for vehicle use that projects light forward is provided. The lighting apparatus includes: a base; a first light emitting device disposed on the base; a second light emitting device disposed on the base; a first lens body disposed in front of the first light emitting device; a second lens body disposed in front of the second light emitting device; and a light restrictor adjacent to the first lens body, the light restrictor restricting light emitted by the second light emitting device from entering the first lens body.
Accordingly, light leak can be reduced and lighting efficiency can be increased.
The figures depict one or more implementations in accordance with the present teaching, by way of examples only, not by way of limitations. In the figures, like reference numerals refer to the same or similar elements.
Hereinafter, a lighting apparatus and automobile according to embodiments are described in detail with reference to the accompanying drawings. Note that the embodiments described below show a specific preferred example of the present disclosure. Therefore, the numerical values, shapes, materials, structural elements, arrangement and connection of the structural elements, etc., shown in the following embodiment are mere examples, and are not intended to limit the present disclosure. Consequently, among the structural elements in the following embodiments, elements not recited in any one of the independent claims which indicate the broadest concepts of the present disclosure are described as arbitrary structural elements.
Hereinafter, in this disclosure, “front” and “forward” refer to the direction in which light is emitted from the lighting apparatus (i.e., the light-emitting direction) and the light-extraction direction in which light is extracted, and “back” and “behind” refer to the direction opposite the front/forward direction. Furthermore, “front” and “forward” refer to the direction of travel when an automobile moves forward, “right” and “left” are from the perspective of the driver, “up”, “upward”, and “above” refer to the direction toward the ceiling of the automobile, and “down”, “downward”, and “below” refer to the direction opposite the up/upward/above direction. Additionally, the Z axis corresponds to the anteroposterior direction, the Y axis corresponds to the up and down (vertical) directions, and the X axis corresponds to the left and right (horizontal, lateral) directions.
It should be noted that the respective figures are schematic diagrams and are not necessarily precise illustrations. Additionally, components that are essentially the same share the same reference numerals in the respective figures, and overlapping explanations thereof are omitted or simplified.
First, automobile 100 according to a first embodiment will be described with reference to
As illustrated in
In the first embodiment, headlights 120 are headlight assemblies used in a vehicle and include housing 121, front cover 122, and a lighting apparatus (not shown in
Housing 121 is, for example, a metal chassis and has an opening from which light emitted from the lighting apparatus exits. Front cover 122 is a headlight cover that transmits light and covers the opening of housing 121. Housing 121 and front cover 122 are sealed together so as to keep water and dust from entering housing 121.
The lighting apparatus is disposed behind front cover 122 and attached to housing 121. The light emitted by the lighting apparatus transmits through front cover 122 and travels outward.
Lighting Apparatus
Next, lighting apparatus 1 according to the first embodiment will be described with reference to
Lighting apparatus 1 according to the first embodiment is a vehicle lighting apparatus used in, for example, a vehicle headlight, and projects light forward. As illustrated in
Base 2 includes heat sink 30 and shield 40.
More specifically, high beam lamp 3 includes first high beam lamp 3a, first high beam lamp 3b, and second high beam lamp 3c. Here, first high beam lamp 3a includes first high beam light emitting device 11a and first collimating lens 21a. First high beam lamp 3b includes first high beam light emitting device 11b and first collimating lens 21b. Second high beam lamp 3c includes second high beam light emitting device 11c and second collimating lens 21c.
Low beam lamp 4 includes low beam light emitting device 14 (also referred to as second light emitting device) and low beam lens unit 22 (also referred to as second lens body).
High beam light source module 10 and low beam light source module 13 are herein defined as follows. As illustrated in
Lens body 20 is herein defined as follows. As illustrated in
As illustrated in
Light restrictor 60 restricts light emitted by the second light emitting device (low beam light emitting device 14) from traveling into the high beam light path. Here, light restrictor 60 restricts light emitted by the second light emitting device (low beam light emitting device 14) from entering the first lens body (high beam lens unit 21). Light restrictor 60 may diffusely reflect light emitted by the second light emitting device and, alternatively, may absorb light emitted by the second light emitting device. When light restrictor 60 is to reflect light diffusely, the surface of light restrictor 60 may be roughened instead of treated to have a mirror finish. For example, the surface of light restrictor 60 (the bottom surface in
As illustrated in
In the first embodiment, heat sink 30 and shield 40 together form base 2, and high beam light source module 10 and low beam light source module 13 are disposed on base 2. In other words, high beam light emitting device 11 and low beam light emitting device 14 are disposed on base 2.
As illustrated in
As illustrated in
Note that high beam lamp 3 and low beam lamp 4 may include other optical components.
As illustrated in
Moreover, light restrictor 60 is adjacent to high beam lens unit 21 (i.e., below high beam lens unit 21). Light restrictor 60 is integrally formed with base 2. In other words, light restrictor 60 is integrally formed with at least one of heat sink 30 or shield 40. In the first embodiment, light restrictor 60 is exemplified as being integrally formed with shield 40.
Hereinafter, each structural element will be described in detail.
Light Source Modules
High beam light source module 10 is an LED module for producing the high beam, and is used to illuminate an area a far distance ahead. Low beam light source module 13 is an LED module for producing the low beam, and is used to illuminate the road immediately ahead.
A plurality of high beam light emitting devices 11 (first high beam light emitting device 11a, first high beam light emitting device 11b, and second high beam light emitting device 11c) are mounted on substrate 12 in high beam light source module 10. In the first embodiment, first high beam light emitting device 11a, first high beam light emitting device 11b, and second high beam light emitting device 11c are mounted so as to correspond to first collimating lens 21a, first collimating lens 21b, and second collimating lens 21c, respectively. Low beam light emitting device 14 is mounted on substrate 15 in low beam light source module 13.
High beam light source module 10 and low beam light source module 13 are, for example, white light sources, such as B-Y white LED light sources that use a blue LED chip and a yellow phosphor to emit white light. Alternatively, high beam light source module 10 and low beam light source module 13 may be white LED light sources that use an LED chip that emits red light, an LED chip that emits green light, and an LED chip that emits blue light to collectively emit white light.
Moreover, high beam light source module 10 and low beam light source module 13 may be surface mount device (SMD) modules, and alternatively may be chip on board (COB) modules.
When high beam light source module 10 and low beam light source module 13 are SMD modules, high beam light emitting device 11 and low beam light emitting device 14 are each an SMD LED mounted on an LED chip (bare chip) and sealed with a sealant (phosphor-containing resin) in a resin package. When high beam light source module 10 and low beam light source module 13 are COB modules, high beam light emitting device 11 and low beam light emitting device 14 are each LED chips themselves, and are directly mounted on substrate 12 and substrate 15, respectively. In this case, the LED chips mounted on substrate 12 and substrate 15 are sealed with a sealant such as a phosphor-containing resin.
Substrate 12 and substrate 15 are, for example, ceramic substrates made of, for example, alumina, resin substrates made of resin, or insulated metal substrates consisting of a metal baseplate covered by a layer of insulating material. Substrate 12 and substrate 15 have a shape in plan view corresponding to the shape of the mounting surface on heat sink 30 to which substrate 12 and substrate 15 are mounted.
High beam light source module 10 having such as structure is fixed to first heat sink 31 of heat sink 30. More specifically, substrate 12 is mounted and fixed to a predetermined mounting surface on first heat sink 31. Moreover, in the first embodiment, substrate 12 is arranged standing (i.e., vertically) so that high beam light source module 10 projects light in a forward direction. In other words, the optical axis of high beam light source module 10 (high beam light emitting device 11) is parallel to the Z axis.
Low beam light source module 13 is fixed to second heat sink 32 of heat sink 30. More specifically, substrate 15 is mounted and fixed to a predetermined mounting surface on second heat sink 32. Moreover, in the first embodiment, substrate 15 is arranged laying flat (i.e., horizontally) so that low beam light source module 13 projects light in an upward direction. In other words, the optical axis of low beam light source module 13 (low beam light emitting device 14) is parallel to the Y axis.
Lens Body
As illustrated in
As described above, high beam lens unit 21 is disposed in front of high beam light source module 10 and configured of three collimating lenses—first collimating lens 21a, first collimating lens 21b, and second collimating lens 21c.
As illustrated in
More specifically, first collimating lens 21a, first collimating lens 21b, and second collimating lens 21c each have a truncated cone shape whose diameter increases toward the front. The plurality of high beam light emitting devices 11 (first high beam light emitting device 11a, first high beam light emitting device 11b, and second high beam light emitting device 11c) are disposed in the smaller diameter regions of these truncated cones (i.e., toward the back).
With this configuration, light emitted by first high beam light emitting device 11a, first high beam light emitting device 11b, and second high beam light emitting device 11c is collimated by totally reflecting off the inner face of the truncated conical and curved outer wall. The collimated light then exits the front surface (planar surface) of first collimating lens 21a, first collimating lens 21b, and second collimating lens 21c, and travels forward.
Low beam lens unit 22 is disposed in front of low beam light source module 13. Low beam lens unit 22 is also disposed in front of shield 40. More specifically, low beam lens unit 22 is disposed so as to cover an opening formed in front of shield 40.
The lower portion of low beam lens unit 22 has the shape of a quarter slice of a sphere (one quarter of a sphere), and the upper portion has the shape of one quarter of a sphere with portions in front of the three lenses included in high beam lens unit 21 removed.
As illustrated in
Heat Sink
Heat sink 30 is a heat dissipating component for dissipating heat generated by high beam light source module 10 and low beam light source module 13 (to the atmosphere). Consequently, heat sink 30 is preferably made of a material with a high rate of heat transfer, such as metal. Heat sink 30 is, for example, an aluminum die cast heat sink made from composite aluminum.
As illustrated in
First heat sink 31 is a heat dissipating component for dissipating heat generated mainly by high beam light source module 10 (high beam light emitting device 11). First heat sink 31 includes a mounting surface (installation surface) for mounting high beam light source module 10.
Second heat sink 32 is a heat dissipating component for dissipating heat generated mainly by low beam light source module 13 (low beam light emitting device 14). Second heat sink 32 includes a mounting surface (installation surface) for mounting low beam light source module 13.
In the first embodiment, the front end portion of first heat sink 31 protrudes further forward than the front end portion of second heat sink 32. This allows high beam light source module 10 to be disposed further forward than low beam light source module 13.
Shield
Shield 40 is for defining a predetermined cut-off line. Shield 40 defines the predetermined cut-off line by shielding a portion of the light emitted by low beam light source module 13. As illustrated in
As illustrated in
Note that reflector 41 and shield 40 may be separate components instead of being formed integrally.
Next, light restrictor 60, which is integrally formed with shield 40, will be described with reference to
As illustrated in
As illustrated in
Edge Portion of Light Restrictor
Next, the connection of the edge portion of light restrictor 60 and reflector 41 will be discussed.
As described above, with lighting apparatus 1 according to the first embodiment, light restrictor 60 is capable of reducing the amount of or preventing light leaking from low beam light emitting device 14 toward high beam lens unit 21. This increases the lighting efficiency. Moreover, since light restrictor 60 is integrally formed with shield 40, manufacturing costs are reduced.
In the first embodiment, light restrictor 60 is exemplified as being integrally formed with shield 40, but in the second embodiment, light restrictor 60 is integrally formed with heat sink 30.
In
Light restrictor 60 is integrally formed with first heat sink 31 and adjacent to first lens body (i.e., high beam lens unit 21). More specifically, light restrictor 60 has a curved surface that corresponds to the sides of first collimating lens 21a, first collimating lens 21b, and second collimating lens 21c. First heat sink 31 is made of a metal such as aluminum. Consequently, light restrictor 60 can restrict or prevent light from entering.
As described above, with lighting apparatus 1 according to the second embodiment, light restrictor 60 is capable of reducing the amount of or preventing light leaking from low beam light emitting device 14 toward high beam lens unit 21. This increases the lighting efficiency. Moreover, since light restrictor 60 is integrally formed with heat sink 30, manufacturing costs are reduced.
Note that the two protrusions disposed on the front (Z axis direction) top (Y axis direction) portion of first heat sink 31 are provided to support the top portions of high beam light source module 10 and high beam lens unit 21.
Variations
Next, as a variation of light restrictor 60, an example will be given where a portion of light restrictor 60 is integrally formed with shield 40 and the remaining portion is integrally formed with heat sink 30.
As illustrated in
The first component (light restrictor 60a) and the second component (light restrictor 60b) partially overlap one another. This overlapping portion eliminates any gap between the portion where the first component and the second component connect.
Moreover, the protruding portions of the first component and the second component resulting from the integral design (i.e., the length of light restrictor 60 in the anteroposterior direction) are shorter than the first and second embodiments. This consequently makes formation (manufacturing) of shield 40 and heat sink 30 more simple.
Next, the method used to fix low beam light source module 13 mounted on second heat sink 32 will be described.
The four recessed portions 15a abut against substrate stops disposed on second heat sink 32 on which substrate 15 is mounted. Recessed portions 15a in
Moreover, movement of substrate 15 in a direction perpendicular to the surface of substrate 15 is restricted by substrate retainer 41a. Substrate retainer 41a is disposed on and integrally formed with base 2 (e.g., first heat sink 31). Note that substrate retainer 41a and reflector 41 may be integrally formed with first heat sink 31.
With this configuration of substrate 15, the substrate stop, and substrate retainer 41a, movement of substrate 15 in directions both parallel and perpendicular to the surface of substrate 15 can be easily inhibited. In other words, positional deviation of substrate 15 can be easily inhibited.
Note that in
As described above, lighting apparatus 1 according to the first and second embodiments is a lighting apparatus for vehicle use that projects light forward, and includes: base 2; first light emitting device 11 disposed on base 2; second light emitting device 14 disposed on base 2; first lens body 21 disposed in front of first light emitting device 11; second lens body 22 disposed in front of second light emitting device 14; and light restrictor 60 adjacent to first lens body 21, light restrictor 60 restricting light emitted by second light emitting device 14 from entering first lens body 21
With this, leak light from the second light emitting device (low beam light emitting device 14) can be restricted from entering the first lens body (high beam lens unit 21).
Here, base 2 may include: heat sink 30 that dissipates heat from first light emitting device 11 and second light emitting device 14; and shield 40 that defines a cut-off line for light emitted forward by second light emitting device 14, and light restrictor 60 may be integrally formed with at least one of heat sink 30 and shield 40.
With this, since the light restrictor is integrally formed with the base, manufacturing costs are reduced.
Here, light restrictor 60 may be integrally formed with shield 40.
With this, since the light restrictor is integrally formed with the shield, manufacturing costs are reduced.
Here, light restrictor 60 may be integrally formed with heat sink 30.
With this, since the light restrictor is integrally formed with the heat sink, manufacturing costs are reduced.
Here, light restrictor 60 may include first component 60a integrally formed with shield 40 and second component 60b integrally formed with heat sink 30, and first component 60a and second component 60b may at least partially overlap one another.
With this, since a portion of the light restrictor is integrally formed with the shield, and the remaining portion is integrally formed with the heat sink, formation (manufacturing) is simplified.
Here, shield 40 may include reflector 41 that reflects light from second light emitting device 14 toward second lens body 22, and light restrictor 60 may be connected to an edge portion of reflector 41.
This makes it possible to reduce or prevent light leak at the portion where the light restrictor and the reflector are connected.
Here, at least one of an edge portion of light restrictor 60 and the edge portion of reflector 41 may include a recessed portion, and the edge portion of light restrictor 60 and the edge portion of reflector 41 may be connected via the recessed portion.
This makes it possible to reduce or prevent light leak at the portion where the light restrictor and the reflector are connected.
Here, the lighting apparatus may include substrate 15 on which second light emitting device 14 is mounted, and base 2 may include: substrate retainer 41a that restricts movement of substrate 15 in a direction perpendicular to a surface of substrate 15; and a substrate stop that inhibits movement of substrate 15 in a direction parallel to the surface of substrate 15.
With this, movement of the substrate in directions both parallel and perpendicular to the surface of the substrate can be easily inhibited. In other words, positional deviation of the substrate can be easily inhibited.
Here, substrate 15 may be substantially rectangular and may include, in a corner, recessed portion 15a abutting the substrate stop.
With this, since recessed portions 15a are formed in the four corners of the substrate, manufacturing of the substrate is easier.
Here, one of first light emitting device 11 and second light emitting device 14 may be a low beam light source for use in an automobile, and the remaining one of first light emitting device 11 and second light emitting 14 device may be a high beam light source for use in the automobile.
This makes it possible to restrict light leaking from second light emitting device toward first lens body in the automobile, in particular.
Here, lighting apparatus 1 may further include first light source module 10 disposed on base 2 and second light source module 13 disposed on base 2, wherein first light source module 10 may include substrate 12 and a plurality of first light emitting devices 11 mounted on substrate 12, second light source module 13 may include second light emitting device 14, first lens body 21 may include a plurality of lenses (for example, first collimating lens 21a, first collimating lens 21b, and second collimating lens 21c) disposed in front of the plurality of first light emitting devices 11 in a one-to-one relationship, substrate 12 may be held down onto base 2 by substrate retainer 21e, 21f, and substrate retainer 21e,21f may be disposed in a position that does not overlap with the plurality of lenses in a front view of lighting apparatus 1.
Here, base 2 may include heat sink 30, heat sink 30 may include first heat sink 31 thermally coupled to first light emitting device 11 and second heat sink 32 thermally coupled to second light emitting device 14, and first heat sink 31 and second heat sink 32 may be adjoined in a direction intersecting the anteroposterior direction.
Moreover, automobile 100 according to each embodiment includes the above-described lighting apparatus 1.
This makes it possible to restrict light leaking from second light emitting device toward first lens body.
Other Variations
Although the lighting apparatus, automobile, etc., according to the present disclosure have been described based on the above embodiments and variations thereof, the present disclosure is not limited thereto.
For example, light restrictor 60 is exemplified as being integrally formed with at least one of heat sink 30 or shield 40, but light restrictor 60 may be an independent component.
In the third embodiment, a lighting apparatus and automobile with which the light emitting devices and lenses can be accurately positioned.
Typically, the accuracy of the optical axis of the optical system of the lighting apparatus is critical in achieving a desired light distribution pattern when the low beams and the high beams are used. More specifically, the accuracy of positioning of the low beam light emitting device and the lens as well as the positioning of the high beam light emitting device and the lens is critical. However, accurately positioning these light emitting devices and lenses is not simple.
Accordingly, a lighting apparatus according to one aspect of the third embodiment that is for vehicle use and projects light forward is provided. The lighting apparatus includes: a first light source module disposed on the base; a second light source module disposed on the base; a first optical component disposed in front of the; and a second optical component disposed in front of the second light source module, wherein the first light source module includes a substrate and a plurality of first light emitting devices mounted on the substrate, the first optical component includes a plurality of lenses disposed in front of the plurality of the first light emitting devices in a one-to-one relationship, the substrate is held down onto the base by a substrate retainer, and the substrate retainer is disposed in a position that does not overlap with the plurality of lenses in a front view of the lighting apparatus.
With this, the positioning of the light emitting devices and lenses can be controlled, making it possible to increase the positioning accuracy of the light emitting devices and lenses.
The external view of automobile 100 according to the third embodiment is the same as illustrated in
Lighting Apparatus
Next, lighting apparatus 1 according to the third embodiment will be described with reference to
Lighting apparatus 1 according to the third embodiment is a vehicle lighting apparatus used in, for example, a vehicle headlight, and projects light forward. As illustrated in
As illustrated in
As illustrated in
As illustrated in
In the third embodiment, heat sink 30 and shield 40 together form base 2, and high beam light source module 10 and low beam light source module 13 are disposed on base 2. In other words, high beam light emitting device 11 and low beam light emitting device 14 are disposed on base 2.
As illustrated in
Note that although two first high beam lamps 3a and 3b are exemplified here, a configuration including one is acceptable as well. Moreover, high beam lamp 3 may be only one of first high beam lamp 3a, first high beam lamp 3b, and second high beam lamp 3c.
As illustrated in
Note that high beam lamp 3 and low beam lamp 4 may include other optical components.
As illustrated in
Hereinafter, each structural element will be described in detail.
Light Source Modules
High beam light source module (first light source module) 10 is an LED module for producing the high beam, and is used to illuminate an area a far distance ahead. Low beam light source module (second light source module) 13 is an LED module for producing the low beam, and is used to illuminate the road immediately ahead.
As the high beam light source, a plurality of high beam light emitting devices 11 (first high beam light emitting device 11a, first high beam light emitting device 11b, and second high beam light emitting device 11c) are mounted on substrate 12 in high beam light source module 10. In the third embodiment, first high beam light emitting device 11a, first high beam light emitting device 11b, and second high beam light emitting device 11c are mounted so as to correspond to first collimating lens 21a, first collimating lens 21b, and second collimating lens 21c, respectively. As the low beam light source, low beam light emitting device 14 is mounted on substrate 15 in low beam light source module 13.
High beam light source module 10 and low beam light source module 13 are, for example, white light sources, such as B-Y white LED light sources that use a blue LED chip and a yellow phosphor to emit white light. Alternatively, high beam light source module 10 and low beam light source module 13 may be white LED light sources that use an LED chip that emits red light, an LED chip that emits green light, and an LED chip that emits blue light to collectively emit white light.
Moreover, high beam light source module 10 and low beam light source module 13 may be surface mount device (SMD) modules, and alternatively may be chip on board (COB) modules.
When high beam light source module 10 and low beam light source module 13 are SMD modules, high beam light emitting device 11 and low beam light emitting device 14 are each an SMD LED mounted on an LED chip (bare chip) and sealed with a sealant (phosphor-containing resin) in a resin package. When high beam light source module 10 and low beam light source module 13 are COB modules, high beam light emitting device 11 and low beam light emitting device 14 are each LED chips themselves, and are directly mounted on substrate 12 and substrate 15, respectively. In this case, the LED chips mounted on substrate 12 and substrate 15 are sealed with a sealant such as a phosphor-containing resin.
Substrate 12 and substrate 15 are, for example, ceramic substrates made of, for example, alumina, resin substrates made of resin, or insulated metal substrates consisting of a metal baseplate covered by a layer of insulating material. Substrate 12 and substrate 15 have a shape in plan view corresponding to the shape of the mounting surface on heat sink 30 to which substrate 12 and substrate 15 are mounted.
High beam light source module 10 having such as structure is fixed to first heat sink 31 of heat sink 30. More specifically, substrate 12, on which high beam light emitting device 11 is mounted, is mounted and fixed to a predetermined mounting surface on first heat sink 31. Moreover, in the third embodiment, substrate 12 is arranged standing (i.e., vertically) so that high beam light source module 10 projects light in a forward direction. In other words, the optical axis of high beam light source module 10 (high beam light emitting device 11) is parallel to the Z axis.
Low beam light source module 13 is fixed to second heat sink 32 of heat sink 30. More specifically, substrate 15, on which low beam light emitting device 14 is mounted, is mounted and fixed to a predetermined mounting surface on second heat sink 32. Moreover, in the third embodiment, substrate 15 is arranged laying flat (i.e., horizontally) so that low beam light source module 13 projects light in an upward direction. In other words, the optical axis of low beam light source module 13 (low beam light emitting device 14) is parallel to the Y axis.
Lens Body
As illustrated in
In the third embodiment, high beam lens unit 21 and low beam lens unit 22 are integrally formed together to form lens body 20. For example, lens body 20 can be made by, for example, injection molding using a clear resin such as acryl, polycarbonate, or cyclic olefin. Note that high beam lens unit 21 and low beam lens unit 22 are not required to be integrally formed.
High beam lens unit 21 is a first optical component disposed in front of high beam light source module 10. As described above, high beam lens unit 21 is disposed in front of high beam light source module 10 and includes three lenses—first collimating lens 21a, first collimating lens 21b, and second collimating lens 21c.
The light paths for the high beam and the low beam are the same as illustrated in
Note that in the third embodiment, the optical axis of second collimating lens 21c is oblique to the optical axes of first collimating lens 21a and first collimating lens 21b. This makes it possible to horizontally space apart the center of the area illuminated by second high beam lamp 3c and the center of the area illuminated by first high beam lamp 3a and first high beam lamp 3b.
Heat Sink
Heat sink 30 is a heat dissipating component for dissipating heat generated by high beam light source module 10 and low beam light source module 13 (to the atmosphere). Consequently, heat sink 30 is preferably made of a material with a high rate of heat transfer, such as metal. Heat sink 30 is, for example, an aluminum die cast heat sink made from composite aluminum.
As illustrated in
First heat sink 31 is a heat dissipating component for dissipating heat generated mainly by high beam light source module 10 (high beam light emitting device 11). First heat sink 31 includes a mounting surface (installation surface) for mounting high beam light source module 10.
Second heat sink 32 is a heat dissipating component for dissipating heat generated mainly by low beam light source module 13 (low beam light emitting device 14). Second heat sink 32 includes a mounting surface (installation surface) for mounting low beam light source module 13.
In the third embodiment, the front end portion of first heat sink 31 protrudes further forward than the front end portion of second heat sink 32. This allows high beam light source module 10 to be disposed further forward than low beam light source module 13.
Shield
Shield 40 is for defining a predetermined cut-off line. Shield 40 defines the predetermined cut-off line by shielding a portion of the light emitted by low beam light source module 13. As illustrated in
As illustrated in
Note that reflector 41 and shield 40 may be separate components instead of being formed integrally.
On/Off Control
As illustrated in
In the third embodiment, when the high beams are turned on, lighting controller 130 turns on high beam light source module 10 (first high beam light emitting device 11a, first high beam light emitting device 11b, and second high beam light emitting device 11c) and low beam light source module 13 (low beam light emitting device 14). In other words, lighting controller 130 turns on all light emitting devices when the high beams are turned on. When the low beams are turned on, however, lighting controller 130 only turns on low beam light emitting device 14.
Engine control unit (ECU) 140 controls the engine of automobile 100. Engine control unit 140 is, for example, a microcontroller. Lighting controller 130 and switch 150 are connected to engine control unit 140. Engine control unit 140 transmits an instruction input from switch 150 to lighting controller 130.
Switch 150 switches lighting apparatus 1 on and off. More specifically, switch 150 switches the low beams on and off and switches the high beams on and off. More specifically, switch 150 switches on and off high beam light source module 10 (first high beam light emitting device 11a, first high beam light emitting device 11b, and second high beam light emitting device 11c) and low beam light source module 13 (low beam light emitting device 14).
For example, when driving at night and an oncoming vehicle is present, the driver of automobile 100 operates switch 150 to cause lighting apparatus 1 to project the low beam. More specifically, lighting controller 130 turns on only low beam light source module 13 (low beam light emitting device 14) to form the low beam and illuminate the road with a predetermined low beam lighting pattern.
Moreover, when driving at night and an oncoming vehicle is not present, the driver of automobile 100 operates switch 150 to cause lighting apparatus 1 to project the high beam. More specifically, lighting controller 130 turns on high beam light source module 10 and low beam light source module 13 to form the high beam and illuminate the area ahead with a predetermined high beam lighting pattern.
Note that in the third embodiment, all light emitting devices are turned on when the high beams are turned on, but this example is not limiting. For example, only high beam light source module 10 may be turned on when the high beams are turned on, and only low beam light source module 13 may be turned on when the low beams are turned on. In other words, high beam light source module 10 and low beam light source module 13 may have a mutually exclusive relationship when turned on.
Configuration of High Beam Lens Unit and High Beam Light Source Module
Next, the configuration of high beam lens unit 21 and high beam light source module 10 will be described in detail with reference to
As illustrated in
High beam lens unit 21 can be integrally molded from a transparent resin material. In this case, first collimating lens 21a, first collimating lens 21b, second collimating lens 21c, connecting portion 21d, substrate retainer 21e, substrate retainer 21f, and extension 21g are integrally formed as a single component.
Moreover, in the third embodiment, since high beam lens unit 21 includes three collimating lenses, high beam lens unit includes two connecting portions 21d. More specifically, high beam lens unit 21 includes one connecting portion 21d connecting first collimating lens 21a and first collimating lens 21b, and one connecting portion 21d connecting first collimating lens 21b and second collimating lens 21c.
Connecting portions 21d are formed so as to fill in the gap between the two adjacent lenses. Connecting portion 21d is, for example, a plate having a substantially arc-shaped outer edge in a front view of lighting apparatus 1. In a front view of the plate, the outer perimeter of the plate is defined by a portion of the outer edges of two adjacent collimating lenses in high beam lens unit 21 and the arc-shaped outer edge described above. In the third embodiment, connecting portion 21d is substantially fan-shaped in front view.
Note that high beam lens unit 21 may be formed such that each outer edge of first collimating lens 21a, first collimating lens 21b, and second collimating lens 21c is inscribed in the substantially arc-shaped boundary of connecting portion 21d.
Connecting portion 21d includes notches 21d1. Notches 21d1 are cut out from the curved top edge of connecting portion 21d. Protrusions 31d protruding from heat sink 30 (first heat sink 31) are inserted into notches 21d1.
Substrate retainers 21e (first substrate retainers) are disposed on connecting portion 21d and formed so as to protrude from connecting portion 21d toward substrate 12 of high beam light source module 10. In the third embodiment, substrate retainers 21e are, for example, cylindrical columns. Moreover, one substrate retainer 21e is formed on each of the two connecting portions 21d.
Substrate retainers 21f (second substrate retainers) are disposed on extension 21g and formed so as to protrude from extension 21g toward substrate 12 of high beam light source module 10. In the third embodiment, substrate retainers 21f are, for example, cylindrical columns. Moreover, one substrate retainer 21f is formed on each of the two extensions 21g.
The four substrate retainers 21e and 21f are disposed in positions that do not overlap with the plurality of lenses included in high beam lens unit 21 (first collimating lens 21a, first collimating lens 21b, and second collimating lens 21c) in front view.
In the third embodiment, the two substrate retainers 21e are disposed in a region within a line enveloping the outer edges of the plurality of lenses included in high beam lens unit 21 (first collimating lens 21a, first collimating lens 21b, and second collimating lens 21c) in front view.
More specifically, each substrate retainer 21e is disposed within the region of connecting portion 21d (substantial fan shape) in plan view. Furthermore, each substrate retainer 21e is disposed substantially equidistant from the outer edges of two adjacent lenses in plan view. Note that “substantially equidistant” does not exclusively refer to actual substantial equidistance, but also includes substantial equidistance in design, and is a general concept intended to include a margin of error to account for, for example, production tolerance. Each substrate retainer 21f is disposed within the region of extension 21g in plan view.
Substrate retainers 21e and substrate retainers 21f have the same shape and length, and a recessed portion is formed in the tip of each of substrate retainers 21e and substrate retainers 21f. More specifically, cylindrical columns (small diameter portions) smaller in diameter than the main cylindrical columns of substrate retainers 21e and substrate retainers 21f are formed on the tips of substrate retainers 21e and substrate retainers 21f. In other words, the tips of substrate retainers 21e and substrate retainers 21f have a stepped surface such that a recessed surface is formed one step down from the tip surface.
Extensions 21g extend outward (i.e., in the X axis direction) from the outer positioned ones of the plurality of lenses. Extensions 21g are formed on the right and left peripheries of high beam lens unit 21 in a front view.
As illustrated in
Two notches 12a are cut out of the top edge of the arc shape of substrate 12. Additionally, notch 12b is cut out of the right edge of substrate 12, and notch 12b is cut out of the left edge of substrate 12. Notches 12a are located in positions corresponding to substrate retainers 21e formed on high beam lens unit 21. Notches 12b are located in positions corresponding to substrate retainers 21f formed on high beam lens unit 21.
Next, how high beam lens unit 21, high beam light source module 10, and heat sink 30 are connected together will be described with reference to
As illustrated in
With this configuration, high beam light source module 10 is held down onto heat sink 30 by high beam lens unit 21. More specifically, substrate 12 included in high beam light source module 10 is held down onto first heat sink 31 by substrate retainers 21e and substrate retainers 21f formed on high beam lens unit 21.
Note that in this case, high beam lens unit 21 is held down by another holding member (not shown in the drawings) from the front. This holding member may be, for example, a screw.
Moreover, in the third embodiment, protrusions 31d formed on first heat sink 31 are inserted into notches 21d1 cut into connecting portion 21d of high beam lens unit 21. In other words, protrusions 31d are lens holding members, and hold the top portion of connecting portion 21d. In this way, high beam lens unit 21 is also held in place by protrusion 31d.
As illustrated in
Here, the stepped surface (recessed surface) of the tip of substrate retainer 21f engages with the front surface of substrate 12. As such, substrate 12 is held down on first heat sink 31 by a pressing force applied by the stepped surface of the tip of substrate retainer 21f. Consequently, high beam lens unit 21 and high beam light source module 10 can be accurately aligned.
Moreover, the side surface of small diameter portion and the inner surface of notch 12b come into contact when the small diameter portion of the tip of substrate retainer 21f is inserted into notch 12b cut out of substrate 12. This makes it possible to restrict horizontal (XY plane) movement of high beam lens unit 21, thereby making it possible to even more accurately align high beam lens unit 21 and high beam light source module 10 with ease.
Although not illustrated in
As described above, with lighting apparatus 1 according to the third embodiment, substrate 12 included in high beam light source module 10 is pressed onto base 2 by substrate retainers 21e and substrate retainers 21f formed on high beam lens unit 21. In the third embodiment, substrate 12 included in high beam light source module 10 is pressed onto heat sink 30 (first heat sink 31) by substrate retainers 21e and substrate retainers 21f.
This makes it easy to align high beam lens unit 21 and high beam light source module 10.
Moreover, in the third embodiment, substrate retainers 21e and substrate retainers 21f are disposed in positions that do not overlap with the plurality of lenses included in high beam lens unit 21 (first collimating lens 21a, first collimating lens 21b, and second collimating lens 21c), in a front view of lighting apparatus 1.
With this, substrate retainers 21e and substrate retainers 21f can be formed without affecting the plurality of lenses included in high beam lens unit 21 (first collimating lens 21a, first collimating lens 21b, and second collimating lens 21c). Consequently, even when substrate retainers 21e and substrate retainers 21f are formed, the anteroposterior length of high beam lens unit 21 can be kept from being too long, making it possible to reduce the overall size of lighting apparatus 1.
In this way, with lighting apparatus 1 and automobile 100 according to the third embodiment, high beam lens unit 21 and high beam light source module 10 can be accurately aligned and the size of lighting apparatus 1 can be reduced.
Moreover, in the third embodiment, substrate retainers 21e are disposed on connecting portion 21d and protrude from connecting portion 21d toward substrate 12 of high beam light source module 10.
With this, by applying a pressing force in a backward direction on high beam lens unit 21, substrate 12 also receives this backward pressing force from substrate retainers 21e and substrate retainers 21f, and is consequently held in place. This allows for high beam light source module 10 to be easily and securely held in place.
Moreover, in the third embodiment, connecting portion 21d of high beam lens unit 21 is substantially fan-shaped in front view, and substrate retainer 21e is disposed within the fan-shaped region in front view.
This makes it possible to arrange lighting apparatus so as to fit in a given circular region (e.g., a φ70 mm region) in front view.
Moreover, in the third embodiment, heat sink 30 of base 2 includes protrusions 31d as a lens holding member. Protrusions 31d hold the top portion of connecting portion 21d.
This makes it possible to easily hold high beam lens unit 21 in place.
Moreover, in the third embodiment, each substrate retainer 21e is disposed substantially equidistant from the outer edges of two adjacent lenses among the plurality of lenses (first collimating lens 21a, first collimating lens 21b, and second collimating lens 21c) in plan view.
When substrate retainer 21e is made from resin, pressing down on substrate 12 places stress on substrate retainers 21e, which can lead to substrate retainers 21e breaking, for example. However, by disposing each substrate retainer 21e is substantially equidistant from the outer edges of two adjacent lenses, stress placed on substrate retainers 21e from pressing down on substrate 12 can be equally distributed. This makes it possible to control, for example, breakage of substrate retainers 21e.
Moreover, in the third embodiment, substrate retainers 21f are formed on extensions 21g extending from both ends of high beam lens unit 21.
This makes it possible to securely hold substrate 12 included in high beam light source module 10 in place since both ends of substrate 12 are held down.
Moreover, in the third embodiment, heat sink 30 may include holding members that hold extensions 21g of high beam lens unit 21. In this case, substrate retainers 21e and substrate retainers 21f formed on high beam lens unit 21 may have a thermal expansion coefficient (linear expansion coefficient) that is greater than the thermal expansion coefficient (linear expansion coefficient) of the holding members. For example, the holding members may be made of metal, and substrate retainers 21e may be made from resin. With this, extensions 21g are pinched by the holding members when substrate retainers 21e thermally expand due the heat generated by high beam light emitting device 11 when the high beams are used. As a result, the pressing force on substrate 12 by substrate retainer 21e increases and substrate 12 can be held in place even more securely.
As described above, lighting apparatus 1 according to the third embodiment is for vehicle use, projects light forward, and includes: base 2; first light source module 10 disposed on base 2; second light source module 13 disposed on base 2; a first optical component (first lens body 21) disposed in front of first light source module 10; and a second optical component (second lens body 22) disposed in front of second light source module 13, wherein first light source module 10 includes substrate 12 and a plurality of first light emitting devices 11 mounted on substrate 12, the first optical component (first lens body 21) includes a plurality of lenses (for example, first collimating lens 21a, first collimating lens 21b, and second collimating lens 21c) disposed in front of the plurality of first light emitting devices 11 in a one-to-one relationship, substrate 12 is held down onto base 2 by substrate retainers 21e, 21f, and substrate retainers 21e, 21f are disposed in a position that does not overlap with the plurality of lenses in a front view of lighting apparatus 1.
This makes it possible to control the positioning of the light emitting devices and the lenses and thus accurately align the light emitting devices and the lenses.
Here, base 2 may include heat sink 30, and substrate 12 may be held down onto heat sink 30 by substrate retainers 21e, 21f.
Here, heat sink 30 may include first heat sink 31 to which first light source module 10 is fixed and second heat sink 32 to which second light source module 13 is fixed, and substrate 12 may be held down onto first heat sink 31 by substrate retainers 21e, 21f.
Here, the first optical component (first lens body 21) may include connecting portion 21d that connects adjacent ones of the plurality of lenses (first collimating lens 21a, first collimating lens 21b, and second collimating lens 21c), and substrate retainers 21e, 21f may be disposed on connecting portion 21d and protrude toward substrate 12.
Here, connecting portion 21d may be a plate having a substantially arc-shaped outer edge in a front view of lighting apparatus 1, and an outer perimeter of the plate in a front view of lighting apparatus 1 may be defined by a portion of an outer edge of the adjacent ones of the plurality of lenses (first collimating lens 21a, first collimating lens 21b, and second collimating lens 21c) and the substantially arc-shaped outer edge.
Here, connecting portion 21d may be substantially fan-shaped in front view, and substrate retainers 21e, 21f may be disposed within the fan-shaped region in a front view of lighting apparatus 1.
Here, base 2 may include a lens holding member (protrusion 31d) and the lens holding member (protrusion 31d) may hold a top portion of connecting portion 21d.
Here, substrate retainers 21e, 21f may be disposed substantially equidistant from the outer edges of two adjacent lenses (first collimating lens 21a, first collimating lens 21b, and second collimating lens 21c) in a plan view of lighting apparatus 1.
Here, the first optical component (first lens body 21) may include extension 21g that extends outward from the outer positioned ones of the plurality of lenses (first collimating lens 21a, first collimating lens 21b, and second collimating lens 21c), and substrate retainers 21e, 21f may be disposed on extension 21g.
Here, heat sink 30 may include a holding member that holds extension 21g, and substrate retainers 21e, 21f may have a thermal expansion coefficient that is greater than the thermal expansion coefficient of the holding member.
Here, lighting apparatus 1 may further include shield 40 that shields a portion of light from at least one of first light source module 10 and second light source module 13, and substrate retainers 21e, 21f may be disposed on shield 40.
Here, one of first light source module 10 and second light source module 13 may be a high beam light source module, and the remaining one of first light source module 10 and second light source module 13 may be a low beam light source module.
Moreover, automobile 100 according to the third embodiment includes the above-described lighting apparatus 1, and vehicle body 110 including lighting apparatus 1 disposed in front.
Other Variations
Although the lighting apparatus, automobile, etc. according to the present disclosure are described based on embodiments, the present disclosure is not limited to these embodiments.
For example, in the above embodiments, substrate retainers 21e and substrate retainers 21f are disposed on high beam lens unit 21, but may be disposed in other locations so long as those locations do not overlap with first collimating lens 21a, first collimating lens 21b, and second collimating lens 21c. For example, substrate retainers 21e and substrate retainers 21f may be disposed on shield 40.
Moreover, in the above embodiments, substrate 12 of high beam light source module 10 is held onto heat sink 30 using substrate retainers 21e and substrate retainers 21f of high beam lens unit 21, but substrate 15 of low beam light source module 13 may also be held onto heat sink 30 based on the same principle. In this case, a desired structural element disposed on lighting apparatus 1 may be used as the substrate retainer.
Moreover, in the above embodiments, heat sink 30 is divided into two components—and upper component and a lower component—but heat sink 30 is not limited to this configuration. For example, heat sink 30 may be divided into a left component and a right component.
In the fourth embodiment, a lighting apparatus and automobile with which both optical alignment and thermal efficiency can be achieved for two light emitting devices without compromising the ease of assembly of the lighting apparatus, even when a heat sink for dissipating the heat generated by the two light emitting devices is used, will be described.
Generally, an LED generates heat when it outputs light. This heat increases the temperature of the LED, decreasing the light output of the LED. For this reason, lighting apparatuses generally include a heat sink to dissipate the heat generated by the LED.
However, vehicle lighting apparatuses include two light emitting devices (light sources)—a low beam light emitting device and a high beam light emitting device. This makes it difficult to include a heat sink while achieving both optical alignment and thermal efficiency for two light emitting devices without compromising the ease of assembly of other components in the lighting apparatus.
In order to overcome this, according to one aspect of the present disclosure, a lighting apparatus for vehicle use that projects light forward is provided. The lighting apparatus includes: a base including a heat sink; a first light emitting device disposed on the base; a second light emitting device disposed on the base; and a lens body disposed in front of the first light emitting device and the second light emitting device, wherein the heat sink includes a first heat sink thermally coupled to the first light emitting device and a second heat sink thermally coupled to the second light emitting device, and the first heat sink and the second heat sink are adjoined in a direction intersecting the anteroposterior direction.
This makes it possible to provide a lighting apparatus and automobile which achieve both optical alignment and thermal efficiency for two light emitting devices without compromising the ease of assembly of the lighting apparatus.
The external view of automobile 100 according to the fourth embodiment is the same as illustrated in
Lighting Apparatus
The perspective, front, top, cross sectional views as well as the light paths of lighting apparatus 1 according to the fourth embodiment are the same as illustrated in
Moreover, details regarding structural elements such as high beam light source module 10, low beam light source module 13, high beam lens unit (first lens body) 21, low beam lens unit (second lens body) 22, heat sink 30, shield 40, etc., are the same as previously described.
On/Off Control
The block diagram illustrated
Heat Sink Configuration
Next, heat sink 30 will be described in detail with reference to
As illustrated in
Moreover, heat sink 30 includes a rotation restricting structure that restricts rotational movement of first heat sink 31 and second heat sink 32. Rotational movement of first heat sink 31 and second heat sink 32 is, for example, rotational movement of one or both of first heat sink 31 and second heat sink 32 in the XZ plane (horizontal plane) that results in a misalignment between first heat sink 31 and second heat sink 32, or rotational movement of one or both of first heat sink 31 and second heat sink 32 about the Z axis that results in a misalignment between first heat sink 31 and second heat sink 32.
As illustrated in
Recessed portion 31a is formed in first heat sink 31 so as to recede away from second heat sink 32. Moreover, recessed portion 31a includes planar side surface 31a1 facing the anteroposterior direction.
In the fourth embodiment, planar side surface 31a1 is parallel to the XY plane, and extends along the X axis. In front view, planar side surface 31a1 has, for example, an elongated rectangular shape that is horizontally long.
Protruding portion 32a is formed on second heat sink 32 so as to protrude toward first heat sink 31. Protruding portion 32a includes a planar side surface (planar wall) 32a1 facing the anteroposterior direction. The cross sectional shape of planar side surface 32a1 through the ZX plane is rectangular.
In the fourth embodiment, protruding portion 32a is a laterally extending (i.e., extends along the X axis) elongated protrusion. Planar side surface 32a1 is thus parallel to the XY plane, and extends laterally (along the X axis). In front view, planar side surface 32a1 has, for example, an elongated rectangular shape that is horizontally long.
Moreover, a plurality of protruding portions 32a are formed. More specifically, two protruding portions 32a are disposed so as to be spaced apart from each other and have a lengthwise dimension along the X axis. In this example, the two protruding portions 32a are formed such that planar side surfaces 32a1 thereof are flush.
Moreover, in the fourth embodiment, the adjoining portions of first heat sink 31 and second heat sink 32 (i.e., the surfaces of first heat sink 31 and second heat sink 32 that are in contact) are sloping surfaces. In other words, sloping surface 31b formed on first heat sink 31 and sloping surface 32b formed on second heat sink 32 are in contact.
Sloping surface 31b of first heat sink 31 and sloping surface 32b of second heat sink 32 slope forward (the direction in which light is extracted). In other words, the distance between sloping surface 31b of first heat sink 31 and the Z axis as illustrated in
Recessed portion 31a of first heat sink 31 is formed at an end portion of the slope of sloping surface 31b of first heat sink 31. In other words, recessed portion 31a is formed so as to recede at the forward terminal end portion of sloping surface 31b.
Moreover, protruding portion 32a of second heat sink 32 is formed at an end portion of the slope of sloping surface 32b of second heat sink 32. In other words, protruding portion 32a is formed at the forward terminal end portion of sloping surface 32b.
First heat sink 31 and second heat sink 32 having the hereinbefore described configurations are assembled by bringing recessed portion 31a and protruding portion 32a into contact. More specifically, when first heat sink 31 and second heat sink 32 are in an assembled state, planar side surface 31a1 of recessed portion 31a and planar side surface 32a1 of protruding portion 32a are in contact. Note that in the fourth embodiment, the depth of recessed portion 31a and the height of protruding portion 32a are, but not limited to being, approximately equal.
Next, the method of putting together first heat sink 31 and second heat sink 32 will be described with reference to
As illustrated in (a) in
Here, first heat sink 31 and second heat sink 32 are slid so as to bring recessed portion 31a of first heat sink 31 and protruding portion 32a of second heat sink 32 closer together.
Moreover, as illustrated in (b) in
Main Functional Effect
Next, the functional effect of lighting apparatus 1 according to the fourth embodiment will be described.
As described above, heat sink 30 in lighting apparatus 1 includes first heat sink 31 (high beam heat sink) thermally coupled to high beam light emitting device 11 (first light emitting device) and second heat sink 32 (low beam heat sink) thermally coupled to low beam light emitting device 14 (second light emitting device). First heat sink 31 and second heat sink 32 are adjoined in a direction intersecting the anteroposterior direction.
Therefore, by dividing heat sink 30 into first heat sink 31 and second heat sink 32 and assembling the two together, the portions where first heat sink 31 and second heat sink 32 are connected (i.e., the surfaces of first heat sink 31 and second heat sink 32 that are in contact) or a layer of air between first heat sink 31 second heat sink become resistant to heat. With this, the heat dissipation paths for high beam light emitting device 11 and low beam light emitting device 14 are separated. Consequently, with respect to high beam light emitting device 11 and low beam light emitting device 14, the effect heat generated by one has on the other is reduced.
In particular, in the fourth embodiment, all light emitting devices are turned on when the low beams are turned on, and the heat generated by high beam light source module 10 is greater than the heat generated by low beam light source module 13. Thus, in the fourth embodiment, by separating the heat dissipation paths for high beam light emitting device 11 and low beam light emitting device 14, a decrease in the output of low beam light source module 13 (low beam light emitting device 14) caused by the heat generated by high beam light source module 10 (high beam light emitting device 11) can be, for example, reduced.
Note that in the fourth embodiment, the portions where first heat sink 31 and second heat sink 32 are connected (i.e., the surfaces of first heat sink 31 and second heat sink 32 that are in contact) are in the rear portion of heat sink 30, positioned far away from high beam light emitting device 11 and low beam light emitting device 14. Consequently, with respect to high beam light emitting device 11 and low beam light emitting device 14, the effect heat generated by one has on the other is further reduced.
Moreover, such as is the case with the fourth embodiment, heat sink 30 can be manufactured with ease by dividing heat sink 30 into a plurality of components. Furthermore, since dividing heat sink 30 into a plurality of components increases flexibility with respect to assembly (design flexibility), it is possible to manufacture multiple types of heat sink 30 each suited to a particular product destination. Furthermore, dividing heat sink 30 into a plurality of components makes routing power supply connector wires connected to each of high beam light source module 10 and low beam light source module 13 easier, making assembly of lighting apparatus 1 easier.
Furthermore, dividing heat sink 30 into a high beam heat sink (first heat sink 31) and a low beam heat sink (second heat sink 32) makes it possible to thermally design high beam light emitting device 11 and low beam light emitting device 14 individually. In other words, flexibility with respect to thermal design is increased.
Moreover, in the fourth embodiment, high beam light emitting device 11 is fixed to first heat sink 31 and low beam light emitting device 14 is fixed to second heat sink 32.
With this, the vector of the optical axis (high beam optical axis) of high beam light emitting device 11 can be controlled with the positioning and orientation of first heat sink 31, and the vector of the optical axis (low beam optical axis) of low beam light emitting device 14 can be controlled with the positioning and orientation of second heat sink 32.
Therefore, optical alignment of high beam lamp 3 including high beam light emitting device 11 and optical alignment of low beam lamp 4 including low beam light emitting device 14 can be accomplished simply by assembling together first heat sink 31 and second heat sink 32 in addition to allowing for individual thermal design of high beam light emitting device 11 and low beam light emitting device 14.
The optical axis of high beam lamp 3 and the optical axis of low beam lamp 4 may be aligned when performing optical alignment. For example, the vector of the optical axis of high beam lamp 3 and the vector of the optical axis of low beam lamp 4 may be made to be the same.
In this case, if first heat sink 31 to which high beam light emitting device 11 is fixed and second heat sink 32 to which low beam light emitting device 14 were to shift out of alignment, desired light distribution patterns would not be achieved when the high beams and low beams were used.
In this case, if first heat sink 31 and second heat sink 32 were to shift horizontally (in the X axis direction), this would not affect the light distribution pattern, but if one or both of first heat sink 31 and second heat sink 32 were to rotationally shift in the XZ plane (horizontal plane) or rotationally shift about the Z axis, desired light distribution patterns would not be achieved. When this sort of rotational shift occurs, the low beam light distribution pattern in particular is greatly affected.
In light of this, lighting apparatus 1 includes a rotation restricting structure that restricts rotational movement of first heat sink 31 and second heat sink 32. In the fourth embodiment, the rotation restricting structure includes recessed portion 31a of first heat sink 31 and protruding portion 32a of second heat sink 32. Moreover, planar side surface 31a1 of recessed portion 31a and planar side surface 32a1 and protruding portion 32a are in contact.
With this, one or both of first heat sink 31 and second heat sink 32 can be restricted from rotating in the XZ plane (horizontal plane). This makes it possible to achieve both optical alignment and thermal efficiency.
Moreover, in the fourth embodiment, the heat sink is divided into two upper and lower portions (first heat sink 31 and second heat sink 32), and the portions of first heat sink 31 and second heat sink 32 that join together are planar surfaces (contact surfaces).
With this, one or both of first heat sink 31 and second heat sink 32 can be restricted from rotating about the Z axis.
Moreover, in the fourth embodiment, first heat sink 31 includes sloping surface 31b that slopes toward the front and second heat sink 32 includes sloping surface 32b that slopes toward the front. Moreover, recessed portion 31a of first heat sink 31 is formed at an end portion of the slope of sloping surface 31b of first heat sink 31, and protruding portion 32a of second heat sink 32 is formed at an end portion of the slope of sloping surface 32b of second heat sink 32.
With this, when sloping surface 31b and sloping surface 32b are placed in contact with each other upon assembling first heat sink 31 and second heat sink 32 together, the weight of first heat sink 31 causes first heat sink 31 to slide, making it easy to bring recessed portion 31a of first heat sink 31 and protruding portion 32a of second heat sink 32 into contact. This makes it easy to assemble first heat sink 31 and second heat sink 32 together while also aligning first heat sink 31 and second heat sink 32 in the Z axis direction.
Moreover, lighting apparatus 1 according to the fourth embodiment includes an anteroposterior movement restricting structure that restricts anteroposterior movement (movement along the Z axis) of first heat sink 31 and second heat sink 32. In the fourth embodiment, recessed portion 31a of first heat sink 31 and protruding portion 32a of second heat sink 32 restrict anteroposterior movement of first heat sink 31 and second heat sink 32. More specifically, one of recessed portion 31a of first heat sink 31 and protruding portion 32a of second heat sink 32 pushes against the other to restrict anteroposterior movement of first heat sink 31 and second heat sink 32.
As described above, lighting apparatus 1 and automobile 100 according to the fourth embodiment can achieve both optical alignment and thermal efficiency for two light emitting devices (high beam light emitting device 11 and low beam light emitting device 14) without compromising the ease of assembly of the lighting apparatus.
As described above, lighting apparatus 1 according to the fourth embodiment is for vehicle use, projects light forward, and includes: base 2 including heat sink 30; first light emitting device 11 disposed on base 2; second light emitting device 14 disposed on base 2; and lens body 20 disposed in front of first light emitting device 11 and second light emitting device 14, wherein heat sink 30 includes first heat sink 31 thermally coupled to first light emitting device 11 and second heat sink 32 thermally coupled to second light emitting device 14, and first heat sink 31 and second heat sink 32 are adjoined in a direction intersecting the anteroposterior direction.
Here, first light emitting device 11 may be fixed to first heat sink 31, and second light emitting device 14 may be fixed to second heat sink 32.
Here, lighting apparatus 1 may further include a rotation restricting structure that restricts rotational movement of first heat sink 31 and second heat sink 32.
Here, rotation restricting structure may include recessed portion 31a formed in first heat sink 31, in a portion facing second heat sink 32, and protruding portion 32a formed on second heat sink 32, on a portion facing first heat sink 31; recessed portion 31a may be formed so as to recede away from second heat sink 32 and include a planar side surface facing the anteroposterior direction; protruding portion 32a may be formed so as to protrude toward first heat sink 31 and include a planar side surface facing the anteroposterior direction; and the planar side surface of recessed portion 31a and the planar side surface of protruding portion 32a are in contact.
Here, first heat sink 31 and second heat sink 32 may each include a sloping surface, the sloping surface of first heat sink 31 and the sloping surface of second heat sink 32 may slope forward and be in contact, recessed portion 31a may be formed at an end portion of the sloping surface of first heat sink 31, and protruding portion 32a may be formed at an end portion of the sloping surface of second heat sink 32.
Here, the lighting apparatus may include an anteroposterior movement restricting structure that restricts anteroposterior movement of first heat sink 31 and second heat sink 32.
Here, anteroposterior movement restricting structure may include recessed portion 31a formed in first heat sink 31, in a portion facing second heat sink 32, and protruding portion 32a formed on second heat sink 32, on a portion facing first heat sink 31; recessed portion 31a may be formed so as to recede away from second heat sink 32 and include a planar side surface facing the anteroposterior direction; protruding portion 32a may be formed so as to protrude toward first heat sink 31 and include a planar side surface facing the anteroposterior direction; and the planar side surface of recessed portion 31a and the planar side surface of protruding portion 32a are in contact.
Here, first heat sink 31 and second heat sink 32 may each include a sloping surface, the sloping surface of first heat sink 31 and the sloping surface of second heat sink 32 may slope forward and be in contact, recessed portion 31a may be formed at an end portion of the sloping surface of first heat sink 31, and protruding portion 32a may be formed at an end portion of the sloping surface of second heat sink 32.
Here, one of first light emitting device 11 and second light emitting device 14 may be a high beam light source, and the remaining one of first light emitting device 11 and second light emitting device 14 may be a low beam light source.
Moreover, automobile 100 according to the fourth embodiment includes the above-described lighting apparatus 1, and vehicle body 110 including lighting apparatus 1 disposed in front.
Although the lighting apparatus, automobile, etc., according to the present disclosure are described based on the first through fourth embodiments, the present disclosure is not limited to these embodiments.
For example, in the above embodiments, the rotation restricting structure is exemplified as recessed portion 31a and protruding portion 32a, where planar side surface 31a1 of recessed portion 31a and planar side surface 32a1 of protruding portion 32a are brought into contact to restrict rotational movement of first heat sink 31 and second heat sink 32. However, the rotation restricting structure is not limited to this example; the rotation restricting structure may, for example, be configured as illustrated in
Note that protruding portion 31c may have a circular or quadrilateral shape in a bottom view and recessed portion 32c may have a circular or quadrilateral shape in a top view, but by forming protruding portion 31c and recessed portion 32c to have a non-circular shape, such as a quadrilateral shape, in bottom and top views, respectively, only one protruding portion 31c and one recessed portion 32c need be formed. Moreover, in
Moreover, in the above embodiments, recessed portion 31a is formed on first heat sink 31 and protruding portion 32a is formed on second heat sink 32, but conversely a protruding portion equivalent to protruding portion 32a may be formed on first heat sink 31 and a recessed portion equivalent to recessed portion 31a may be formed on second heat sink 32.
Moreover, in the above embodiments, heat sink 30 is divided into two components—and upper component and a lower component—but heat sink 30 is not limited to this configuration. For example, heat sink 30 may be divided into a left component and a right component, and first heat sink 31 and second heat sink 32 may be horizontally adjacent to each other. Moreover, heat sink 30 is not limited to two components; heat sink 30 may be divided into three or more components.
Moreover, in the above embodiments, the lighting apparatus is exemplified as being applied to a headlight that projects a high beam and a low beam, but the lighting apparatus may be applied to an auxiliary light such as a fog light or a daylight/daytime running light (DRL).
Moreover, although the automobile is exemplified as a four-wheeled automobile in the above embodiments, the automobile may be other automobiles such as a two-wheeled automobile (motorbike).
Moreover, in the above embodiments, the light emitting devices are exemplified as LEDs, but the light emitting devices may be semiconductor devices such as semiconductor lasers, electroluminescent (EL) devices such as organic EL devices or non-organic EL devices, or any other solid state light emitting device.
While the foregoing has described what are considered to be the best mode and/or other examples, it is understood that various modifications may be made therein and that the subject matter disclosed herein may be implemented in various forms and examples, and that they may be applied in numerous applications, only some of which have been described herein. It is intended by the following claims to claim any and all modifications and variations that fall within the true scope of the present teachings.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2014-098144 | May 2014 | JP | national |
| 2014-098146 | May 2014 | JP | national |
| 2014-098158 | May 2014 | JP | national |
| Number | Name | Date | Kind |
|---|---|---|---|
| 7156544 | Ishida | Jan 2007 | B2 |
| 8154864 | Nearman | Apr 2012 | B1 |
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| 20150323147 A1 | Nov 2015 | US |
