Patent Application
20070279927
A vehicle lamp in accordance with embodiments of the invention will be explained in reference to the drawings below. Further, an illustrated embodiments may apply to a headlamp for an automobile.
The lamp body 2 is constituted by a shape of a vessel having a front face that is open, and covered by the transparent front face cover 3. A plurality of LED units 5, 6, 7 are arranged inside of a lamp chamber 4 partitioned by the lamp body 2 and the front face cover 3.
The LED units 5, 6 are light emitting elements of a so-called projector type, and include LEDs as light sources, reflectors for converging light of the LEDs, and projecting lenses for projecting converged light of the LEDs to a front side.
The LED unit 5 is an LED unit for irradiating a pattern having a left skewed cutoff line and having a large spread in a left and right direction (hereinafter referred to as a “middle diffusing left light distribution unit”). As can be seen in
The reflector 52 is for converging light of the LED 51 and includes a reflecting face 52a by a shape of, for example, substantially an ellipsoid of revolution. The LED 51 is arranged at a first focal point position thereof. Therefore, light of the LED 51 is converged to a second focal point position of the reflector 52 having a slight width in the left and right direction. Further, the reflector 52 may converge light of the LED 51 to a desired position and a shape thereof is not limited to the paraboloid of revolution.
The projecting lens 54 is for projecting light of the LED 51 converged by the reflector 52 to the front side by inverting the light in an up and down direction and the left and right direction. The projecting lens 54 is constituted by a shape of a convex lens in which a rear face thereof, i.e., a face thereof on a side opposed to the reflector 52, is constituted by a flat face, and a front face thereof is constituted by a convex curve face (substantially spherical face). A rear side focal point thereof is disposed substantially at the second focal point of the reflector 52.
The shade 53 is for limiting an upper edge of an irradiated pattern. A limit edge 53A for limiting the upper edge of the pattern is disposed at the light converging region, i.e., substantially at the second focal point of the reflector 52. Further, a left side portion 53Al of the limit edge 53A in view from a center thereof (in view from a front side) is inclined in a left downward direction by an angle of about 15°, and a right side portion 53Ar in view therefrom is formed substantially horizontally.
Therefore, according to the middle diffusing left light distribution unit 5, light of the LED 51 is converged to a portion at which the limit edge 53A of the shade 53 is disposed by the reflector 52 having a slight width in the left and right direction, and a portion of the converged light is blocked by the shade 53 to constitute a pattern a lower edge of which is limited by a shape of substantially a mountain in view from the front side. By invertedly projecting the pattern to the front side by the projecting lens 54, as shown by
Further,
Further, a metal-made support member 8 made by a metal, for example, as an aluminum diecast product, is supported by the lamp body 2 to be inclinable in the up and down direction and the left and right direction inside of the lamp chamber 4. That is, 3 pieces of adjusting shafts 82 (only 2 pieces thereof are shown in the drawing) are rotatably supported by a rear face wall 21 of the lamp body 2, and screwed shaft portions 82a formed at front half portions of the adjusting shafts 82 are screwed to nut members 83 supported by the metal-made support member 8. Therefore, when the adjusting shaft 82 is rotated, the screwed shaft portion 82a is screwed to or screwed from the nut member 83. Thereby, the nut member 83 is moved in a front and rear direction along the screwed shaft portion 82a of the adjusting shaft 82. That is, a portion supporting the nut member 83 of the metal-made support member 8 is moved in the front and rear direction. Therefore, a portion by which the nut member 83 screwed with the screwed shaft portion 82a of the adjusting shaft 82 operated to rotate is supported displaced in the front and rear direction relative to a portion by which the other nut member 83 is supported. Thereby, the metal-made support member 8 is inclined relative to the lamp body 2. Further, one of the portions connected to the lamp body 2 by 3 pieces of the adjusting shafts 82 of the metal-made support member 8 may be connected to the lamp body 2 by a pivoting fulcrum portion, or the metal-made support member 8 may inclinably be supported by the lamp body 2 by other support structure.
An LED board 51a mounted with the LED 51 is supported by an upper face of a light source arranging portion 81 integrally projected from a front face of the metal-made support member 8. A back face of the LED board 51a, i.e., a face thereof on a side opposed to the face mounted with the LED 51, is brought into contact with the upper face of the light source arranging portion 81. Further, the reflector 52 is supported on the light source arranging portion 81 to cover the LED 51 from an upper side.
The shade 53 is formed by a synthetic resin. The projecting lens 54 is supported by a front end portion of a support portion 53b projected to the front side from the front end portion. The shade 53 supporting the projecting lens 54 in this way is attached to the front end portion of the light source arranging portion 81. Thereby, the LED 51, the reflector 52, the limit edge 53A of the shade 53, and the projecting lens 54 are integrated by the above-described predetermined positional relationship.
The LED unit 6 is an LED unit for irradiating a pattern having a left skewed cutoff line and having a small spread in the left and right direction (hereinafter referred to as a “left light distribution unit”). The LED unit 6 is provided with a structure substantially the same as that of the LED unit 5. However, light of the LED is converged by an amount smaller than that of the LED unit 5 by a reflector 62. Therefore, as shown by
The LED unit 6 is integrated to a light source arranging portion (not illustrated) projected to a right side in view from the light source arranging portion 81 of the front face of the metal-made support member 8 and the front side.
Further, heat discharge fins 84 are projected from positions of a rear face of the metal-made support member 8 in correspondence with the two light source arranging portions 81.
The LED unit 7 is a diffusing unit for irradiating a diffusing pattern.
The LED unit 7 includes 2 pieces of LEDs 71 and a reflector 72 arranged on a lower side of the LED 71. The reflector 72 includes a reflecting face 72a constituted by a paraboloid curve face having a focal line FL horizontally extended in the left and right direction. Further, 2 pieces of the LEDs 71 are arranged to be spaced apart from each other by a predetermined interval along the focal line FL.
Therefore, when the LED 71 of the LED unit 7 is lighted, light of the LED 71 is reflected by the reflector 72 to the front side along an emitting optical axis X-X of the LED unit 7. Further, because the reflector 72 includes a paraboloid reflecting face 72a, light reflected by the reflecting face 72a constitutes light of a pattern PD (refer to
The LED unit 7 includes an LED support portion 73 for supporting the LED 71, the reflector 72, and a connecting portion 74 connected to the metal-made support member 8. The LED support portion 73, the reflector 72, and the connecting portion 74 are integrally formed as an aluminum diecast product.
The LED support portion 73 is formed in a shape of a plate a face direction of which is extended substantially in the horizontal direction, and is formed with two of mounting faces 73a in a shape of a flat face at a lower face thereof. The LED support portion 73 is integrally connected to an upper end portion of the connecting portion 74. Further, the LED 71 is supported by the LED support portion 73 such that the back face of the LED board 71a mounted with the LED 71, i.e., a face thereof on a side opposed to a face of mounting the LED 71, into face contact with the mounting face 73a. Therefore, the LED 71 is supported by the LED support portion 73 such that an optical axis x71, i.e., an emitting direction, is directed to the lower side.
The reflector 72 is constituted such that the reflecting face 72a is disposed to cover the front side in the irradiating direction of the LED 71 and light from the LED 71 is reflected to the front side of the LED unit 7.
The connecting portion 74 is extended substantially in the vertical direction to be disposed on the rear side of the reflector 72 and an upper end portion thereof is integrally connected with the upper end portion of the reflector 72. A rear face 74a constitutes a contact face brought into contact with the front face of the metal-made support member 8.
A plurality of ribs 75 are formed to align in the left and right direction to bridge the rear face of the reflector 72 and the front face of the connecting portion 74.
Therefore, when the LED 71 of the LED unit 7 is lighted, light of the LED 71 is reflected to the front side by the reflecting face 72a of the reflector 72. Further, because the reflector 72 includes the paraboloid reflecting face 72a, light reflected by the reflecting face 72a becomes light of the pattern PD constituting substantially parallel light with regard to the up and down direction and considerably diffused in the right direction.
Further, the LED unit 7 is attached to the metal-made support member 8 such that the rear face (contact face) 74a of the connecting portion 74 into contact with the front face of the metal-made support member 8. Further, the heat discharge fin 85 is formed at the rear face of the portion of the metal-made support member 8 attached with the connecting portion 74.
Further, the pattern PD is irradiated in a wide range widened in the left right direction, and therefore, a heat generation amount caused by lighting the LED 71 becomes considerable because the LED 71 has a large capacitance and a large light emitting amount is used. Alternatively, a plurality of the LEDs need to be used. However, in the LED unit 7, the LED support portion 73, the reflector 72, and the connecting portion 74 are formed integrally as the aluminum diecast product. Further, an interval between the reflector 72 and the connecting portion 74 is connected by the plurality of ribs 75. Therefore, the heat of the LED 71 is swiftly conducted to the LED support portion 73 with which the back face of the LED board 71a is brought into contact. Additionally, the heat is conducted from the LED support portion 73 to the metal-made support member 8 by way of the reflector 72 and the connecting portion 74, and is swiftly discharged. Further, heat conducted to the reflector 72 is conducted to the connecting portion 74 by way of the rib 75 projected from the back face of the reflector 72 and is discharged from the rib 75 into air (inside the lamp). Therefore, the heat of the LED 71 does not stay at the site of the LED, and it can be avoided that the temperature of the LED 71 is elevated by the heat of lighting the LED 71, which may lead to impairing the function thereof.
Further, because the reflector 72 and the connecting portion 74 are connected by the plurality of ribs 75, the reflector 72 and the connecting portion 74 are reinforced, and the shape stability is promoted. Also, the shape of the reflecting face 72a of the reflector 72 is accurately formed, and the desired light distribution function can be achieved.
In the vehicle lamp 1, when the LED units 5, 6, 7 are lighted, the patterns PB, PS, PD irradiated by the respective LED units 5, 6, 7 are synthesized and the low beam of the pattern P (L) shown in
Although the above-described embodiments are examples applying to the headlamps for an automobile, these examples do not signify that the invention is limited to headlamps for an automobile. Those skilled in the art will appreciate that the range of lamps to which the invention is applicable, for example, a fog lamp, a bending lamp, or the like.
[Description of Reference Numerals and Signs]1 . . . vehicle lamp, 7 . . . LED unit, 71 . . . LED, 71a . . . LED board, 72 . . . reflector, 72a . . . reflecting face, 73 . . . LED support portion, 73a . . . mountuing face, 74 . . . connecting portion, 74a . . . contact face, 75 . . . rib, 8 . . . metal-made support member, X-X . . . emitting optical axis of LED unit, x71 . . . optical axis of LED
While the invention has been described with respect to a limited number of embodiments, those skilled in the art, having benefit of this disclosure, will appreciate that other embodiments can be devised which do not depart from the scope of the invention as disclosed herein. Accordingly, the scope of the invention should be limited only by the attached claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2006-154878 | Jun 2006 | JP | national |
