A lamp device suppresses attenuation and reflection of a radar wave attributable to a light guide body, does not change an electromagnetic wave radiation pattern, and does not impair a radar function. The lamp device includes: a light guide body covering a part of an electromagnetic wave radiation surface of a radar device; and a light source, wherein, when the thickness of the light guide body is denoted by TG, and the wavelength of a radiated electromagnetic wave from the radar device in the light guide body is denoted by λd, TG is set such that TG<λd/2 is satisfied when the reflection loss of the light guide body with respect to the radiated electromagnetic wave is below a transmission loss, and a reflection loss is −10 dB or less when the reflection loss is equal to or more than a transmission loss.
Light emitting unit, and lamp device having a radar device covered with light guide
2023-04-18
Patent
Electronic Resource
English
IPC: | B60Q ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL , Anordnung von Signal- oder Beleuchtungsvorrichtungen, deren Einbau oder Halterung oder deren Schaltkreise bei Fahrzeugen allgemein / F21S Ortsfeste Leuchten , NON-PORTABLE LIGHTING DEVICES |
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European Patent Office | 2019
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