US 12,320,490 B2
Lamp device
Masayuki Kanechika, Tokyo (JP)
Assigned to STANLEY ELECTRIC CO., LTD., Tokyo (JP)
Appl. No. 18/708,748
Filed by Stanley Electric Co., Ltd., Tokyo (JP)
PCT Filed Sep. 21, 2022, PCT No. PCT/JP2022/035153
§ 371(c)(1), (2) Date May 9, 2024,
PCT Pub. No. WO2023/089948, PCT Pub. Date May 25, 2023.
Claims priority of application No. 2021-189687 (JP), filed on Nov. 22, 2021.
Prior Publication US 2025/0003570 A1, Jan. 2, 2025
Int. Cl. B60Q 1/04 (2006.01); B60Q 1/00 (2006.01); F21S 41/148 (2018.01); F21S 41/33 (2018.01); F21S 45/00 (2018.01); G01S 13/931 (2020.01)
CPC F21S 45/00 (2018.01) [B60Q 1/0023 (2013.01); B60Q 1/04 (2013.01); F21S 41/148 (2018.01); F21S 41/336 (2018.01); G01S 13/931 (2013.01); G01S 2013/93277 (2020.01)] 20 Claims
OG exemplary drawing
 
1. A lamp device for a vehicle, comprising:
a lamp unit comprised of a light source and a reflector having a mirror part which reflects light from the light source forward, and
a radar unit arranged behind the lamp unit,
wherein the radar unit is arranged so that at least a portion of the mirror part falls within a radiation range of an electromagnetic wave radiated from the radar unit,
wherein the mirror part includes a resin member and a light reflecting surface formed on a surface of the resin member and comprised of a metallic layer which is partitioned by fine cracks and reflects the light from the light source,
wherein the resin member is comprised of a resin substrate and an intermediate layer formed on the resin substrate, and the metallic layer is formed on the intermediate layer,
wherein the light source emits the light from a position which does not fall within the radiation range of the electromagnetic wave radiated from the radar unit, toward the light reflecting surface which is located within the radiation range of the electromagnetic wave radiated from the radar unit, and
wherein when a thickness of the resin substrate is TR, the thickness of the resin satisfies following conditions (1) and/or (2):
(1) when an effective wavelength of the radiated electromagnetic wave in the intermediate layer is λr,

OG Complex Work Unit Math
(where m is a natural number) is satisfied; and
(2) when an effective wavelength of the radiated electromagnetic wave in the intermediate layer is λr, TR<λr/2 is satisfied when a reflection loss of the resin substrate with respect to the radiated electromagnetic wave is less than a transmission loss, and when the reflection loss is greater than or equal to the transmission loss, TR is set so that the reflection loss is −10 dB or less.