The present invention claims priority under 35 U.S.C. ยง119 to Japanese Patent Application No. 2009-221634 filed on Sep. 25, 2009. The contents of these applications are incorporated herein by reference in their entirety.
Embodiments described herein relate generally to a light-emitting module using semiconductor light-emitting elements, a self-ballasted lamp using the light-emitting module and lighting equipment using the self-ballasted lamp.
In a conventional self-ballasted lamp using LED chips as semiconductor light-emitting elements, a light-emitting module mounting the LED chips and a globe that covers the light-emitting module are attached to one side of a metallic base body, a cap is attached to the other side of the base body via an insulating member, a lighting circuit is housed inside the insulating member, and the lighting circuit and a module substrate are connected to each other through electric wires, and power is supplied from the lighting circuit to the LED chips mounted on the module substrate.
The light-emitting module has the module substrate. For example, SMD (Surface Mount Device) packages with connection terminals, on which the LED chips are loaded respectively, are mounted on one face of the module substrate, and the other face of the module substrate is thermally-conductively brought into contact with and attached to the base body.
In order to connect the electric wires, which extend from the lighting circuit, to the module substrate, a terminal block is attached to one face of the module substrate, and the electric wires which extend from the lighting circuit and are routed from the other face side to the one face side through a side face of the module substrate, are connected to the terminal block.
For example, in the self-ballasted lamp, it is effective to use a substrate, which is made of metal such as aluminum excellent in thermal conductivity, for the module substrate so that heat generated by the LED chips is effectively thermally conducted from the module substrate to the base body side and radiated during lighting. On the metallic substrate, parts cannot be mounted by inserting part of the parts through hole penetrated on the insulation substrate like an insulating substrate because it has conductivity. Therefore, all parts to be mounted on the metallic substrate are required to be a surface mount type, and a surface mount type terminal block is tall but used as the terminal block.
However, since the tall terminal block is arranged on one face on which the LED chips are mounted on the module substrate, light emitted from the LED chips is easily blocked by the terminal block, optical characteristics are affected and a shadow of the terminal block is easily reflected on the globe.
The present invention has been made in view of the above problems and aims to provide a light-emitting module, a self-ballasted lamp and lighting equipment, the module being capable of reducing influence on optical characteristics caused by connection portions of electric wires to the module substrate.
A light-emitting module of each embodiment includes a module substrate, semiconductor light-emitting elements and a connection substrate. On one face side of the module substrate, a conductive layer is formed. The semiconductor light-emitting elements and the connection substrate are mounted on the conductive layer of the module substrate. Electric wires which extend from a lighting circuit are connected to the connection substrate. Power is supplied to the semiconductor light-emitting elements through the connection substrate and the conductive layer of the module substrate.
Next, Embodiment 1 will be described with reference to
The reference numeral 11 denotes a self-ballasted lamp in
The base body 12 is integrally formed of, for example, metal such as aluminum or ceramics, excellent in thermal conductivity and heat radiation performance, a base body portion 21 as a body portion is formed in a center region of the base body 12, and a plurality of heat radiating fins 22 are projected in a radiating manner around the lamp axis along the lamp axial direction on a circumference of the base body portion 21.
On one end side of the base body portion 21, a columnar solid portion 23 is formed, and on the other end side thereof, a cylindrical portion 24 opening toward the other end side is formed.
The heat radiating fin 22 is obliquely formed so that the amount of projection of the fin in a radial direction from the other end side to the one end side of the base body 12 slowly increases. Additionally, the heat radiating fins 22 are formed in a radiating manner at an approximately even interval in the circumferential direction of the base body 12, and a gap 25 is formed between the adjacent heat radiating fins 22. The gaps 25 are opened toward the other end side and the periphery of the base body 12, and closed at one end side of the base body 12. On one end sides of the heat radiating fins 22 and gaps 25, an annular edge portion 26 continuing to the solid portion 23 is formed on the circumference of the solid portion 23.
As shown in
In the base body portion 21 of the base body 21, a wiring hole 31 for making the face of one end side of the base body 12 communicate with an inner face of the cylindrical portion 24 of the other end side of the base body 12 is formed along the lamp axial direction at a position away from the center of the lamp axis.
Additionally, as shown in
As shown in
As shown in
As shown in
Solder paste is applied to the pad portions 50 and 51 of the module substrate 41, the SMD package 53 is mounted on the solder paste of each pad portion 50 so that the terminals on the back face of the SMD package 53 are connected to the solder paste, and the connection substrate 43 is mounted on the solder paste of the pad portions 51 so that the substrate connection portions 58 of the other face side of the substrate 43 are connected to the solder paste. Since the flat portion 63 is here formed at the center of the connection substrate 43, the flat portion 63 can be mounted sticking on the solder paste by a mounting machine. Accordingly, the connection substrate 43 can be automatically mounted together with the SMD packages 53 by the mounting machine. By applying heat after mounting, the SMD packages 53 and the connection substrate 43 are connected and fixed to the module substrate 41 by solder.
The other face of the module substrate 41 is joined and arranged to the attachment face 27 of the base body 12, screws 64 are screwed into the attachment holes 28 of the base body 12 through the attachment grooves 47 of the module substrate 41, and thus the other face of the module substrate 41 is attached to the base body 12 brought into face-contact with the attachment face 27 of the base body 12. Here, a thermally conductive material such as a sheet or grease excellent in thermal conductivity is interposed between the other face of the module substrate 41 and the attachment face 27 of the base body 12. The through-hole 46 of the module substrate 41 coaxially communicates with the wiring hole 31 of the base body 12 with the module substrate 41 attached to the attachment face 27 of the base body 12.
The cover 14 is cylindrically formed of an insulating material such as PBT resin so as to be opened toward the other end side. An annular flange portion 71, which is interposed between the base body 12 and the cap 15 for insulating these from each other, is formed at an outer circumferential portion of the other end side of the cover 14. A wiring hole 72 coaxially communicating with the wiring hole 31 of the base body 12 is formed in a face of one end side of the cover 14.
The cap 15 is, for example, an E26 type or E17 type cap which can be connected to a socket for general bulbs and has a shell 75 engaged with, caulked by and fixed to the cover 14; an insulating portion 76 provided at the other end side of the shell 75; and an eyelet 77 provided at a top portion of the insulating portion 76.
The globe 16 is formed of glass or synthetic resin, which has light diffuseness is in a dome shape so as to cover the light-emitting module 13. The other end side of the globe 16 is opened, and an engaging portion 79, which is engaged with and fixed to an inner circumferential side of the attachment portion 29 of the base body 12 by adhesive or the like, is formed at an edge portion of the opening of the globe 16.
The lighting circuit 17 is, for example, a circuit for supplying constant current to the LED chips 42 of the light-emitting module 13, and has a circuit substrate (not shown) on which a plurality of circuit elements constituting the circuit are mounted, and the circuit substrate is housed in the cover 14.
The shell 75 and eyelet 77 of the cap 15 are electrically connected to an input side of the lighting circuit 17 via connection wires (not shown).
A pair of electric wires 81 is connected to an output side of the lighting circuit 17, these electric wires 81 are inserted into the wiring hole 72 of the cover 14, the wiring hole 31 of the base body 12 and the through-hole 46 of the module substrate 41 and connected to the electric wire connection portions 57 of the connection substrate 43 by solder 82 respectively. A coated electric wire, in which a lead wire 83 is coated with a coating body 84, is used for the electric wire 81, the coating body 84 at the top end is peeled off, the lead wire 83 is exposed, and the lead wires 83 at the top end are connected to the electric wire connection portions 57 of the connection substrate 43 by the solder 82 respectively.
In assembling the self-ballasted lamp 11, before the light-emitting module 13 is screwed into the base body 12, the pair of electric wires 81 of the lighting circuit 17 is pulled out to one end side of the base body 12 through the wiring hole 72 of the cover 14 and the wiring hole 31 of the base body 12, inserted into the through-hole 46 of the module substrate 41 and connected to the electric wire connection portions 57 of the connection substrate 43 by the solder 82 respectively.
Here, the electric wires 81 inserted in the through-hole 46 of the module substrate 41 are fitted into the notch portion 62, which is the electric wire holding portion 61 of the connection substrate 43 and thus positioned and held in relation to the connection substrate 43. Therefore, if a top end side of each electric wire 81 is brought down onto the connection substrate 43, the lead wire 83 at the top end of each electric wire 81 can be easily arranged on each electric wire connection portion 57 of the connection substrate 43 and can be easily soldered onto each electric wire connection portion 57.
When the self-ballasted lamp 11 is energized by attaching the cap 15 to the socket 92 of the lighting equipment 90, the lighting circuit 17 operates, power is supplied to the plurality of LED chips 42 of the light-emitting module 13, the plurality of LED chips 42 emit light, and the light is diffused and emitted through the globe 16.
Heat generated when the plurality of LED chips 42 are lit is conducted to the module substrate 41 and further conducted from the module substrate 41 to the base body 12, and of radiated into the air from surfaces of the base body portion 21 and the plurality of heat radiating fins 22, which are exposed outward of the base body 12.
In the self-ballasted lamp 11, since the connection substrate 43 is mounted on the conductive layer 49 constituting one face of the module substrate 41 and the electric wires 81, which extend from the lighting circuit 17 and are inserted into the through-hole 46 from the other face side to the one face side of the module substrate 41, can be connected to the connection substrate 43, a connection portion of the electric wires 81 to the module substrate 41 can be suppressed to only the height of the connection substrate 43 and the electric wires 81. Thus, light emitted from the LED chips 42 is difficult to block at the connection portions of the electric wires 81 to the module substrate 41, and influence on optical characteristics can be reduced. Additionally, no connector is required to be used for connection of the electric wires 81, and the cost can be suppressed.
On one face side of the connection substrate 43, the electric wire connection portions 57 to which the electric wires 81 are connected are formed, on the other face side thereof, the substrate connection portions 58 connected to the conductive layer 49 constituting one face of the module substrate 41 are formed, and the plurality of through-holes 59 for connecting the electric wire connection portions 57 and substrate connection portions 58 to each other are formed. Therefore, in the cases where the connection substrate 43 is connected to the module substrate 41 by soldering and the electric wires 81 are connected to the connection substrate 43 by soldering, a part of the solder paste enters the through-holes 59, connection intensity and electrical properties can be improved, and protrusion of the excess solder paste from an edge of the connection substrate 43 can be reduced. Moreover, the through-holes 59 may be in plural or singular number.
Additionally, by the electric wire holding portion 61 of the connection substrate 43, the electric wires 81, which are inserted into the through-hole 46 from the other face side to the one face side of the module substrate 41, can be positioned and held, and can be easily connected to the connection substrate 43.
Additionally, since the connection substrate 43 can be connected to the module substrate 41 together with the SMD packages 53, on which the LED chips 42 are loaded, respectively, by reflow soldering, productivity can be improved.
Next, Embodiment 2 will be described with reference to
On the other face side of the connection substrate 43 to be mounted on the module substrate 41, a pair of substrate connection portions 58 and a pair of dummy pad portions 101 not electrically connected to the module substrate 41 are formed. These dummy pad portions 101 are formed at one end side, on which the electric wire holding portion 61 of the connection substrate 43 is formed, that is, approximately symmetrically arranged at one end side opposite from the other end side of the connection substrate on which the pair of substrate connection portions 58 are arranged. Accordingly, the electric wire holding portion 61 and the dummy pad portions 101 are arranged in the vicinity of four corners of the connection substrate 43, respectively.
In the reflow soldering, the solder paste is applied to the pad portions 51 and positions corresponding to the dummy pad portions 101 of the connection substrate 43 of one face of the module substrate 41, and both the electric wire holding portion 61 and dummy pad portions 101 of the connection substrate 43, which are to be mounted on the module substrate 41, are arranged on the solder paste.
Since the solder melts by heating after mounting, the connection substrate 43 moves so as to approach be connected to the module substrate 41. Here, the electric wire holding portion 61 and the dummy pad portions 101 are arranged in the vicinity of the corners of the connection substrate 43, thereby the connection substrate 43 balancedly moves so as to approach the module substrate 41 so that positional deviation of the connection substrate 43 can be reduced.
Assuming that only the electric wire holding portion 61 is disposed at the other end side of the connection substrate 43, the connection substrate 43 sometimes moves to one end side or the other end side and positionally deviates when the solder melts. However, since the electric wire holding portion 61 and the dummy pad portions 101 are arranged in the vicinity of the corners of the connection substrate 43, such positional deviation of the connection substrate 43 can be reduced.
Next, Embodiment 3 will be described with reference to
The electric wire holding portion 61 of the connection substrate 43 is formed by a pair of groove portions 104 into which the electric wires 81 are inserted respectively. Afar end side of the groove portion 104 is curved and has a groove width smaller than a diameter of the coating body 84 of the electric wire 81 so that the electric wire 81 inserted into the groove portion 104 is strongly clamped and can be positioned and held.
Next, Embodiment 4 will be described with reference to
The connection substrate 43 is rectangular, and the electric wire connection portions 57, the substrate connection portions 58 and the through-holes 59 are respectively formed at both end sides symmetrically with respect to a center line as a border in the longitudinal direction. A pair of insertion holes 107, into which the lead wires 83 of the electric wires 81 are inserted from the other face side to the one face side of the connection substrate 43, as the electric wire holding portion 61 is formed at the center portion of the connection substrate 43.
The substrate connection portions 58 at both ends of the connection substrate 43 are mounted on the module substrate 41 by the reflow soldering. In assembling the self-ballasted lamp 11, the lead wire 83 of each electric wire 81 inserted in the base body 12 is inserted into the insertion hole 107 of the connection substrate 43 and connected to the electric wire connection portion 57 by the solder 82.
The electric wires 81 thus can be soldered to the electric wire connection portions 57 from the one face side of the connection substrate 43 from the one face side of the module substrate 41 mounting the connection substrate 43, and connection work can be easily performed.
Moreover, the electric wire connection portion 57 of the connection substrate 43 is constituted by the pad portion in the above embodiments, but is not limited to this, for example, wrapping pins may be erected from the connection substrate 43 and wrapped around by the electric wires 81 for solder connection.
Additionally, although the through-hole 46 is formed on the module substrate 41 and the electric wires 81 are inserted into the through-hole 46 so as to be connected to the connection substrate 43 in the above embodiments, the through-hole 46 does not have to be formed in the module substrate 41 and the electric wires 81 may be connected to the connection substrate 43 through the outside of the module substrate 41.
Additionally, as the semiconductor light-emitting element, an EL (Electro Luminescence) element can be used in place of the LED chip 42. In the case of LEDs, a COB (Chip On Board) module may be used on which a plurality of LED chips are mounted on a module substrate and covered with a phosphor layer.
Additionally, the light-emitting module 13 can be used for not only the self-ballasted lamp 11 but also ceiling attachment type or wall attachment type lighting equipment, etc.
While certain embodiments have been described, these embodiments have been presented by way of example only, and are not intended to limit the scope of the inventions. Indeed, the novel methods and systems described herein may be embodied in a variety of other forms; furthermore, various omissions, substitutions and changes in the form of the methods and systems described herein may be made without departing from the spirit of the inventions. The accompanying claims and their equivalents are intended to cover such forms or modifications as would fall within the scope and spirit of the inventions.
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Number | Date | Country | |
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20110074291 A1 | Mar 2011 | US |