Apparatus for head up display comprising a parabolic reflective

Details Apparatus for head up display comprising a parabolic reflective Apparatus for head up display comprising a parabolic reflective

1994-03-17

1996-04-02

Epps, Georgia Y.

Optical: systems and elements

Single channel simultaneously to or from plural channels

By partial reflection at beam splitting or combining surface

359631, 359637, 345 7, G02B 2714, G09G 500

Patent

active

055046223

ABSTRACT:
The present invention provides an apparatus for a head up display for the use of a motor vehicle, which can make a presentation of an image information in a remote place and which can remove a height-wise positional displacement of a double image and distortion of the double image caused by the curved shape of a vehicle front glass to the extent possible. In the apparatus for a head up display for the use of a motor vehicle according to the present invention, a projector (3) has a middle mirror (6) for reflecting an image information (9) such as characters or marks toward a reflective face. The middle mirror (6) includes a portion (18) of the parabolic reflective face which is located away from a main axis of a parabolic mirror. The portion (18) of the parabolic reflective face includes a first curved surface having a small curvature, corresponding to that portion of a vehicle front glass (2) which has a large curvature, and a second curved surface having a large curvature, corresponding t that portion of the vehicle front glass (2) which has a small curvature, so that distortion of the image information due to difference in curvature of the vehicle front glass (2) is corrected and a height-wise positional displacement of a double image, which may occur when the image information is looked through a pair of eyes (10) and (11) of a person riding on the motor vehicle, is corrected.

REFERENCES:
patent: 3848974 (1974-11-01), Hosking
patent: 4761056 (1988-08-01), Evans
patent: 5006072 (1991-04-01), Letovsky
patent: 5289315 (1994-02-01), Makita

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