Car head-up display including a Fresnel mirror and a curved mirr

Details Car head-up display including a Fresnel mirror and a curved mirr Car head-up display including a Fresnel mirror and a curved mirr

1992-09-30

1994-05-17

Henry, Jon W.

Optical: systems and elements

Single channel simultaneously to or from plural channels

By partial reflection at beam splitting or combining surface

359633, 359851, 359857, 359834, 359727, 359730, G02B 2710, G02B 510

Patent

active

053133269

ABSTRACT:
A projection unit for a car head-up display comprises a display source, a curved mirror which provides the optical power of the projection unit and, in use, receives light from the display source, and a Fresnel mirror extending generally between the display source and the curved mirror and disposed to receive reflected light from the curved mirror and to reflect that light in a desired direction. The curved mirror and the Fresnel mirror may be disposed on a solid block of transparent material having one curved end coated to provide the curved mirror, the display source being located at an opposite end of the block, and the Fresnel mirror being formed in a block face extending from the opposite end of the block to the curved end of the block. A car head-up display including the projection unit may be located in a car with the projection unit being oriented whereby the said desired direction is towards a combiner which, in use, reflects light towards the driver's eyes, the combiner preferably being the car windscreen.

REFERENCES:
patent: 3690240 (1972-09-01), Gold
patent: 3744391 (1973-07-01), Plummer
patent: 4006971 (1977-02-01), Plummer
patent: 4220400 (1980-09-01), Vizenor
patent: 4711512 (1987-12-01), Upatnieks
patent: 5087116 (1992-02-01), Taylor

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