IN-VEHICLE PROJECTION DEVICE

摘要

[Problem] To provide an in-vehicle projection device that can safely project a display image onto a windshield even when using laser light and can be made small in size. [Solution] A collimated beam of laser light emitted by a light-emitting unit (23A, 23B) is converted by an FT lens (33), reflected by a light-transmission mirror (34), and reflected by a first intermediate mirror (35) and a second intermediate mirror (36) such that a holographic image is formed on a screen (51). Projection light (B7) that contains said holographic image is reflected by a first projection mirror (55) and the reflected projection light (B8) is further reflected by a second projection mirror (56) such that a display image is projected onto a windshield. Since the modulating light beam (B4) and the projection light (B8) intersect each other between the first projection mirror (55) and the second projection mirror (56), the device as a whole can be made small in size even if the light path is long.