Patent ID: 11970108
Assignee: MITSUBISHI ELECTRIC CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC B  F | IPC B  F

Claim 0:
1. A headlight device comprising:
a light source unit to emit first light, the light source unit including a plurality of controlled units being capable of controlling amount of light emission independently;
a first optical unit to change a light distribution pattern of the first light incident on the first optical unit;
a light-reception unit to detect incident second light, the light-reception unit including a plurality of detection units being corresponding to the plurality of controlled units and being capable of detecting amount of receiving light independently;
a second optical unit to project the light distribution pattern in a predetermined projection direction and receive incident light traveling in a direction opposite to the projection direction;
a third optical unit to emit the first light traveling toward the second optical unit and emit the incident light that has passed through the second optical unit as the second light traveling toward the light-reception unit; and
a fourth optical unit to focus the second light emitted from the third optical unit and direct toward the light-reception unit, wherein
a part of an optical axis of a projection optical system including the light source unit, the first optical unit and the second optical unit coincides with a part of an optical axis of an image pickup optical system including the second optical unit, the fourth optical unit and the light-reception unit;
wherein the first optical unit forms the light distribution pattern in which an aspect ratio of each light emitting face of a plurality of light emitting faces as the plurality of controlled units is enlarged in a vertical direction of the headlight device; and
a first position and a second position overlap with each other or the first position is shifted within a range of ±2 mm or less from a second position in a horizontal direction of the headlight device, the first position being a position of the plurality of light emitting faces, the second position being a position of a synthesis focal point formed of the first optical unit and the second optical unit,
the light distribution pattern is controlled by changing the amount of emission of controlled units corresponding to the plurality of detection units based on a detection result of the second light in the plurality of detection units of the light-reception unit.