Patent ID: 11933468
Assignee: MITSUBISHI ELECTRIC CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC F  B | IPC F

Claim 12:
13. A headlight device comprising:
a first optical system that emits first light in a predetermined emission direction, the first optical system having a first optical axis; and
a second optical system on which second light traveling in an incidence direction opposite to the emission direction is incident, the second optical system having a second optical axis, and including a light receiver and a first optical part with a light reflecting surface that reflects the second light and guides the light to the light receiver,
wherein:
part of the first optical axis coincides with part of the second optical axis in the emission direction,
part of an optical axis of the first optical system coincides with part of an optical axis of the second optical system in the emission direction,
the light reflecting surface includes a central part arranged on the optical axis of the first optical system, an area of the central part is less than or equal to 20% of area of the light reflecting surface and a reflectance higher than 50% and less than or equal to 100%, and
the central part sets a diameter of the second light traveling toward the light receiver through the second optical system to be smaller than a diameter of the second light when entering the second optical system.