Windshield reflector for imaging signals into view of driver

Details Windshield reflector for imaging signals into view of driver Windshield reflector for imaging signals into view of driver

1986-09-02

1992-09-01

Bovernick, Rodney B.

Optical: systems and elements

Holographic system or element

Head up display

359630, 340705, G02B 532, G02B 2710

Patent

active

051444593

ABSTRACT:
A windshield (1) for motor vehicles provided with a reflecting arrangement (6) for making optical information or signals visible to the driver of the vehicle; said information or signals being made recognizable in the same field of view as is suitable for the observation of traffic and the road ahead by said driver. According to the invention, the reflecting arrangement (6) is a hologram with the characteristic of a mirror. The angle of reflection .alpha. of the holographic mirror is different from the angle of reflection .beta. of the surface of the glass upon which said hologram is mounted. As a result the rays R' reflected from the surface of the glass do not reach the eye (8) of the observer, whereas the rays R reflected from the holographic mirror do. In the case of a bent windshield, a hologram with the function of a flat mirror will be disposed on a carrier layer curved corresponding to the shape of the windshield so that even in the case of bent windshields, the reflected image of the optical signals or information is free of aberrations.

REFERENCES:
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Collier, R., et al, Optical Holography, New York: Academic Press, 1971 pp. 514-522.
Sincerbox, G. IBM Tech. Disc. Bull. 10(3), Aug. 1967, pp. 267-268.
(S04570087) Rao, S., et al, "Holographic Methods for the Fabrication of Various types of Mirrors," Rev. Sci. Instrum. 51(6), Jun., 1980, pp. 809-813.
Magarinos et al; "Holographic Mirrors"; Optical Engineering; vol. 24, No. 5; Sep./Oct. 1985; pp. 769-780.

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