Ambient turn-on suppression hologram

Details Ambient turn-on suppression hologram Ambient turn-on suppression hologram

1992-02-13

1993-09-07

Lerner, Martin

Optical: systems and elements

Holographic system or element

Head up display

340479, 359 15, 359 24, 359494, 359630, G02B 532, G02B 530

Patent

active

052434494

ABSTRACT:
A guard hologram blocks ambient turn-on of an image hologram. In a center high-mounted rearview stoplight assembly, a guard hologram is used to prevent ambient turn-on by the sun and still allow optical transparency of the image hologram. The guard hologram preferred is optically mounted to the lamp side of the image hologram and includes two 0-degree reflection holograms separated by a halfwave film.

REFERENCES:
patent: 4601533 (1986-07-01), Moss
patent: 4790613 (1988-12-01), Moss
patent: 4798426 (1989-01-01), Malcolm et al.
patent: 4892369 (1990-01-01), Moss
patent: 4916593 (1990-04-01), Moss et al.
patent: 4932731 (1990-06-01), Suzuki et al.
patent: 4966426 (1990-10-01), Moss et al.
patent: 4973132 (1990-11-01), McDonald et al.
patent: 5013107 (1991-05-01), Biles
patent: 5138470 (1992-08-01), Moss et al.

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