EP-4421382-B1 - LAMP FITTING, AND VEHICULAR HEADLAMP

EP4421382B1EP 4421382 B1EP4421382 B1EP 4421382B1EP-4421382-B1

Inventors

IKUTA RYUJIRO
NOZUE Shuhei
KATSUURA Yasutaka
UTSUMI RYOSUKE
MOCHIZUKI KAZUMA

Dates

Publication Date: 20260506
Application Date: 20221013

Claims (2)

A vehicular headlamp (1) comprising: a board (140) on which a light source (141) and an integrated circuit (142) that performs switching of power supply to the light source (141) are mounted; and a heat sink (150) on which the board (140) is disposed, wherein a board (140) facing region of the heat sink (150) that faces the board (140) includes a separated portion (155) that is separated from the board (140), and a disposition portion (154) that protrudes toward the board : (140) from the separated portion (155) and on which the board (140) is disposed, and the disposition portion (154) includes a light source facing region (154e) that faces a rear surface of a region (141a) of the board (140) in which the light source (141) is mounted, an integrated circuit facing region (154i) that faces a rear surface of a region (142a) of the board (140) in which the integrated circuit (142) is mounted, and a first coupling region (154c1) that couples the light source facing region (154e) and the integrated circuit facing region (154i), wherein the light source (141) includes a plurality of light emitting elements (141e) arranged in parallel, the light source facing region (154e) extends in a parallel arrangement direction of the plurality of light emitting elements (141e), the integrated circuit facing region (154i) overlaps a straight line orthogonal to a line segment connecting the light emitting elements (141e) positioned at both ends, characterized in that the separated portion (155) is positioned on both sides of the first coupling region (154c1) in the parallel arrangement direction.
The vehicular headlamp according to claim 1, wherein the disposition portion (154) includes an adjustment region (154a) that extends in the parallel arrangement direction over a width larger than a width of the integrated circuit (142) facing region on a side opposite to the light source facing region (154e) with respect to the integrated circuit facing region (154i) and a second coupling region (154c2) that couples the adjustment region (154a) and the integrated circuit facing region (154i).

Description

Technical Field The present invention relates to a a vehicular headlamp. Background Art A lamp fitting including a reflector unit for forming a predetermined light distribution pattern is known, and WO 2019/177050 A1 discloses such a lamp fitting. The lamp fitting of WO 2019/177050 A1 includes a board on which a light source is mounted, a heat sink on which the board is disposed, and the reflector unit. The reflector unit reflects a part of light emitted from the light source in such a way as to form a predetermined light distribution pattern. The reflector unit presses a plurality of parts of the board to press the board against the heat sink, whereby the board is fixed to the heat sink. In addition, the lamp fitting of WO 2019/177050 A1 is a vehicular headlamp, and includes a first light source, a second light source disposed below the first light source, a reflector unit disposed in front of a board, and a projection lens disposed in front of the reflector unit. The reflector unit includes a first reflector disposed between the first light source and the second light source, and a pair of second reflectors disposed above and below the first reflector. A part of light emitted from the first light source is directly incident on the projection lens through between the first reflector and the upper second reflector, another part of the light is reflected toward the projection lens by an upper surface of the first reflector, and still another part of the light is reflected toward the projection lens by the upper second reflector. Thus, the light emitted from the first light source and incident on the projection lens forms a low beam light distribution pattern having a cutoff line corresponding to a shape of a front end of the first reflector. In addition, a part of light emitted from the second light source is directly incident on the projection lens through between the first reflector and the lower second reflector, another part of the light is reflected toward the projection lens by a lower surface of the first reflector, and still another part of the light is reflected toward the projection lens by the lower second reflector. As described above, the light emitted from the second light source and incident on the projection lens forms an additional light distribution pattern, and the additional light distribution pattern and the low beam light distribution pattern form a high beam light distribution pattern. Therefore, the vehicular headlamp can switch light to be emitted between a low beam and a high beam by switching emission and non-emission of light of the second light source. In addition, there is a vehicular headlamp including a light source, a projection lens that transmits emitted light and emits desired light, and a lens holder that holds the projection lens.JP 2017-45616 A discloses such a vehicular headlamp. In the vehicular headlamp, the lens holder is made of a resin, and a light blocking portion is provided between the projection lens and the lens holder in order to prevent the lens holder from being damaged due to concentration of sunlight entering the vehicular headlamp through the projection lens on the lens holder. In addition, there is a vehicular headlamp in which a board on which a light source is mounted is disposed on a heat sink, so that heat generated from the light source is released from the heat sink, and WO 2016/013447 A1 discloses such a vehicular headlamp. In the vehicular headlamp, the board on which a light emitting element array including a plurality of light emitting diodes (LEDs) is mounted is disposed on the heat sink. Specifically, a rear surface of the board where the light emitting element array is mounted is disposed on a protruding board placement surface of the heat sink. Therefore, heat generated from the light emitting element array is conducted from the light emitting element array to the heat sink through the board, and is released from the heat sink. WO 2021/025136 A1 is related to the preamble of claim 1, and EP 3 379 139 A1 as well as JP 2019 046713 A show further prior art. Summary of Invention A lamp fitting according to a first aspect of the present dislosure , not according to the claimed invention, includes: a board on which a light source is mounted; a heat sink on which the board is disposed; and a reflector unit that presses the board against the heat sink and reflects a part of light emitted from the light source, in which the board has recesses which are recessed portions of side surfaces facing each other, the light source is positioned at an inner position with respect to a bottom portion of each of the recesses, and the reflector unit presses parts of the board that are positioned at outer positions with respect to the bottom portion of each of the recesses. In the lamp fitting according to the first aspect, as described above, the board has the recesses which are recessed portions of the side surfaces facing each other. Therefore, a strength of