JP5479054B2 - Vehicle lighting - Google Patents

Description

  The present invention relates to a vehicular lamp. More specifically, the present invention relates to a vehicular lamp in which a semiconductor light emitting device as a light source is arranged in a lamp chamber formed by a lamp body having an opening on the front side of the lamp and a cover attached to cover the opening.

  2. Description of the Related Art In recent years, a vehicular lamp using a semiconductor light emitting element represented by an LED (Light Emitting Diode) excellent in luminous efficiency and power consumption characteristics as a light source is known (see, for example, Patent Document 1). Such a vehicular lamp emits light from the LED toward the front of the lamp directly or by reflecting it with a reflector.

JP 2007-323839 A

  In such a vehicular lamp, it is important to take measures to dissipate heat generated from a semiconductor light emitting element as a light source and a lighting circuit of the semiconductor light emitting element. Therefore, for example, a method in which the substrate on which the semiconductor light emitting element and the lighting circuit are arranged is brought into contact with a part of the lamp body using a clip or the like to dissipate the heat of the substrate through the lamp body.

  However, in such a method, the substrate cannot be sufficiently brought into contact with the lamp body only by a pressing force by a clip or the like, and as a result, heat from the substrate cannot be efficiently radiated.

  In order to solve the above-described problems, the present invention provides a vehicular lamp that uses a semiconductor light emitting element as a light source, and is disposed in a lamp chamber formed by at least a lamp body that opens on the front side of the lamp and a cover that covers the opening. A substrate support member that is fixed to the lamp body and supports the substrate on which the semiconductor light emitting element is mounted, and a protrusion disposed on the front side of the lamp in the lamp chamber and provided on the rear side of the lamp And an optical member that presses the substrate toward the substrate support member at the tip of the vehicle lamp.

  According to such a vehicular lamp, the substrate can be more closely attached to the substrate support member, so that heat generated from the substrate can be efficiently radiated through the substrate support member.

  In the vehicular lamp, it is preferable that the optical member is fixed to the substrate support member, and a flexible heat transfer sheet is disposed between the substrate and the substrate support member.

  Thereby, the adhesiveness with respect to the board | substrate support member of a board | substrate can further improve, and the heat which generate | occur | produces from a board | substrate can be thermally radiated more efficiently.

  In the vehicular lamp, it is preferable that a lighting circuit for the semiconductor light emitting element is provided on the substrate.

  Thereby, the heat generated from the lighting circuit can be efficiently radiated through the substrate support member.

  In the vehicular lamp, it is preferable that the substrate support member and the lamp body are made of metal, and an outer edge portion of the substrate support member is in contact with an inner surface of the lamp body.

  Thereby, the contact area of a board | substrate support member and a lamp body becomes large, and heat dissipation efficiency improves more.

  In the vehicular lamp, it is preferable that the substrate support member is a heat conductive plate-like member that is arranged at a substantially central portion of the lamp body and partitions the lamp chamber forward and backward.

  Thereby, the heat generated from the substrate and transmitted to the substrate support member can be radiated from the surface of the substrate support member on the rear side of the lamp to the lamp chamber space, so that the heat dissipation efficiency is further improved.

  The above summary of the invention does not enumerate all the necessary features of the present invention, and sub-combinations of these feature groups can also be the invention.

1 is a front view of a vehicular lamp 100 according to an embodiment of the present invention. 1 is a rear view of a vehicular lamp 100. FIG. FIG. 3 is a rear view of the vehicular lamp 100 with the rear cover 130 removed. It is sectional drawing in the AA cross section shown in FIG. 5 is an enlarged plan view of the vicinity of one LED 140 on a substrate 150. FIG.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. However, the following embodiment does not limit the invention according to the scope of claims, and all combinations of features in the embodiment are solutions of the invention. It is not always essential to the means.

  FIG. 1 is a front view of a vehicular lamp 100 according to an embodiment of the present invention. FIG. 2 is a rear view of the vehicular lamp 100. FIG. 3 is a rear view of the vehicular lamp 100 with the rear cover 130 removed. 4 is a cross-sectional view taken along a line AA shown in FIG. FIG. 5 is an enlarged plan view of the vicinity of one LED 140 on the substrate 150.

  The vehicular lamp 100 of the present embodiment covers a lamp body 110 that is open on the front and rear sides of the lamp, a front cover 120 that is attached so as to cover an opening on the front side of the lamp body 110, and an opening on the rear side. The outer cover is configured by the rear cover 130 attached in this manner. In the lamp chamber formed by the lamp body 110, the front cover 120, and the rear cover 130, a substrate 150, a base 160, a heat transfer sheet 170, and a reflector 180 are disposed.

  The base 160 in the vehicular lamp 100 is an example of the substrate support member of the present invention, and the reflector 180 is an example of the optical member of the present invention. Moreover, LED140 is an example of the semiconductor light emitting element of this invention.

  Further, in the present specification, “lamp front” or “front” is the left direction in FIG. 4, for example, and means a direction from the rear cover 800 side to the front cover 100 side in the vehicle lamp 10. “Ramp rear” or “rear” means the direction opposite to the front of the lamp (for example, the right direction in FIG. 4). The “lamp side” is a direction orthogonal to the front of the lamp (the rear of the lamp).

  The lamp body 110 is a cylindrical metal member having a substantially square cross section, and is formed by, for example, aluminum die casting. One end of the lamp body 110 is provided with a front flange portion 111 in which a groove cut from the lamp front side to the lamp rear side is formed over the entire outer periphery, and four screw holes 113 are provided at the other end. A formed rear flange 112 is provided.

  Further, on the inner surface of the lamp body 110, a base mounting portion 114 on a flat plate protruding inward is provided. In this example, the base attachment portion 114 is provided at a substantially central portion of the lamp body 110, and the base 160 is attached with two screws 203.

  The front cover 120 is formed of a transparent or translucent resin, and a lamp is formed by inserting a distal end portion of an outer peripheral edge of the dome-shaped main body portion into a groove formed in the front flange portion 111 of the lamp body 110. It is fixed to the body 110.

  The rear cover 130 is made of resin or metal, and has a substantially circular main body portion and a flange-shaped flange portion 131 that extends to the side of the lamp over the entire outer periphery of the main body portion. A through hole (not shown) is formed in the flange portion 131 at a position corresponding to the screw hole 113 when the rear cover 130 is attached to the lamp body 110. The rear cover 130 is fixed to the lamp body 110 by attaching the flange portion 131 to the rear flange portion 112 of the lamp body 110 and inserting the screw 201 into each of the through hole and the screw hole 113. The

  The base 160 is a plate-like member arranged so as to partition the lamp chamber forward and backward at a substantially central portion inside the lamp body 110, and is attached to the base attaching portion 114 with the two screws 203 as described above. A part of the surface of the base 160 on the rear side of the lamp and the surface of the base mounting portion 114 on the front side of the lamp are in contact with each other. Further, the shape of the base 160 substantially coincides with the cross-sectional shape orthogonal to the lamp front-rear direction in the lamp body 110. Therefore, the outer edge portion of the base 160 is in contact with the inner surface of the lamp body 110.

  In this example, the base 160 is made of an aluminum alloy. As the material of the base 160, other metals or the like may be used as long as they have excellent heat conductivity.

  The substrate 150 is a substantially rectangular plate member. The substrate 150 is formed of a semiconductor material such as crystalline silicon, for example, and is disposed on the surface of the base 160 on the front side of the lamp with the heat transfer sheet 170 interposed therebetween. The heat transfer sheet 170 is a sheet material disposed between the substrate 150 and the base 160 as described above. The heat transfer sheet 170 is formed of a flexible material such as silicon rubber having high thermal conductivity, for example.

  Six LEDs 140 are arranged on the rear surface of the substrate 150. In this example, each LED 140 is fixed at a position away from each other on the substrate 150 and has a light emitting surface orthogonal to the front-rear direction of the lamp on the front side of the lamp. When the LED 140 is turned on, light centering on the optical axis substantially parallel to the front-rear direction of the lamp is emitted from the light emitting surface to the front of the lamp.

  Further, a circuit for lighting the LED 140 is formed in the vicinity of each LED 140 (a position indicated by “P2” in FIG. 5). Although the detailed configuration of the lighting circuit is omitted in FIG. 5, the circuit includes a resistor, a rectifier diode, and the like.

  The reflector 180 is integrally formed of, for example, resin, and is provided with a reflective surface 182 on the front surface and bosses 183 and ribs 185 on the rear surface. The reflective surface 182 is a concave surface that is recessed in a substantially parabolic shape toward the rear side of the lamp, and is provided corresponding to each of the six LEDs 140 as shown in FIG.

  In addition, a through hole 181 is provided in the center of each reflecting surface 182, and the light emitting surface of the corresponding LED 140 is exposed through the through hole 181. Each reflecting surface 182 reflects the light from the LED 140 toward the front of the lamp (the front cover 120 side) while condensing the light from the LED 140.

  Further, the screw 202 is inserted into a screw hole 184 formed in the boss 183 in the reflector 180 and a through hole (not shown) formed in a position corresponding to the screw hole 184 in the base 160. 180 is fixed to the base 160.

  The rib 185 is provided on the rear surface of the reflector 180 at a position surrounded by a broken line in FIG. In this example, a plurality of ribs 185 are provided on the rear surface of the reflector 180 so as to surround the LED 140. Each rib 185 is a protrusion that protrudes toward the rear side of the lamp, and a tip portion of the rib 185 contacts the front surface of the substrate 150 to press the substrate 150 toward the base 160. Here, the position where the tip of the rib 185 contacts the front surface of the substrate 150 is, for example, a position indicated by being surrounded by a broken line with “P1” in FIG.

  By pressing the substrate 150 to the base 160 side with the rib 185 in this manner, the substrate 150 can be pressed with a larger pressing force than when the substrate 150 is fixed to the base 160 with a clip or the like. It can be adhered. Therefore, the heat generated from the lighting circuit formed on the LED 140 or the substrate 150 can be efficiently radiated through the base 160. In addition to the ribs 185, a clip or the like for pressing the substrate 150 against the base 160 may be further provided.

  Further, by arranging the flexible heat transfer sheet 170 between the substrate 150 and the base 160 as in this example, the substrate 150 can be brought into close contact with the base 160 via the heat transfer sheet 170. Therefore, the heat generated from the lighting circuit formed on the LED 140 or the substrate 150 can be efficiently radiated to the outside via the heat transfer sheet 170 and the base 160.

  Further, in this example, the base 160 and the lamp body 110 are made of a metal having excellent thermal conductivity. Furthermore, since the outer edge portion of the base 160 is in contact with the inner surface of the lamp body 110, the base 150 and the base body 110 are in contact with each other. The heat transmitted to 160 can be efficiently radiated to the outside through the lamp body 110.

  In this example, since the base 160 is arranged so as to partition the lamp chamber forward and backward, there is also a space between the base 160 and the rear cover 130 as shown in FIG. Therefore, the heat transmitted from the substrate 150 to the base 160 can be dissipated to the space on the rear side.

  By the way, the arrangement of the ribs 185 on the rear surface of the reflector 180 is not limited to this example. For example, the rib 185 may be disposed so that the tip of the rib 185 is in contact with a position closer to the LED 140 on the front surface of the substrate 150 (for example, a position indicated by “P3” in FIG. 5 and surrounded by a broken line). . As a result, even when the substrate 150 is warped, the warp of the substrate 150 at least in the vicinity of the LED 140 is reliably corrected by the pressing force of the rib 185, and thus variation in the optical axis direction of each LED 140 can be suppressed. .

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiment.

DESCRIPTION OF SYMBOLS 100 ... Vehicle lamp 110 ... Lamp body 111 ... Front side flange part 112 ... Back side flange part 113 ... Screw hole 114 ... Base attachment part 120 ... Front cover 130 ... Rear cover 131 ... Flange part 140 ... LED (semiconductor light emitting element) )
150 ... substrate 160 ... base (substrate support member)
170 ... Heat transfer sheet 180 ... Reflector (optical member)
181 ... Through hole 182 ... Reflecting surface 183 ... Boss 184 ... Screw hole 185 ... Rib (projection)
201, 202, 203 ... screw

Claims (5)

A vehicle lamp using a semiconductor light emitting element as a light source,
A substrate support member disposed at least in a lamp chamber formed by a lamp body having an opening on the front side of the lamp and a cover covering the opening, and fixed to the lamp body and supporting a substrate on which the semiconductor light emitting element is mounted;
An optical member that is disposed on the front side of the lamp in the lamp chamber and that presses the substrate against the substrate support member at the tip of a protrusion provided on the rear side of the lamp;
Equipped with a,
The substrate support member and the lamp body are made of metal, and an outer edge portion of the substrate support member is in contact with an inner surface of the lamp body,
Furthermore, a pair of mounting portions projecting toward the inside of the lamp chamber are provided on the inner surface of the lamp body, and the front surface of each of the pair of mounting portions is behind the lamp of the substrate support member. A vehicle lamp characterized by being in contact with a side surface . The surface of the optical member on the lamp rear side is provided with a boss that protrudes toward the lamp rear side and has a screw hole that opens toward the lamp rear side,
A screw is inserted through the through hole and the screw hole formed in the substrate support member from the lamp rear side, and the optical member is fixed to the substrate support member,
The surface on the lamp rear side of the substrate support member is fixed to the pair of mounting portions with screws inserted from the lamp rear side into the pair of mounting portions, respectively . Vehicle lamp. The optical member is fixed to the substrate support member, and a flexible heat transfer sheet is disposed between the substrate and the substrate support member . Vehicle lamp. 4. The vehicular lamp according to claim 1 , wherein a lighting circuit for the semiconductor light emitting element is provided on the substrate . 5. The said board | substrate support member is a heat conductive plate-shaped member which is distribute | arranged to the approximate center part of the said lamp body, and partitions off the said lamp chamber back and forth, The Claim 1 characterized by the above-mentioned. Vehicle lamp.

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