Guard holograms

Details Guard holograms Guard holograms

1990-12-14

1992-08-11

Arnold, Bruce Y.

Optical: systems and elements

Holographic system or element

Head up display

359 15, 359 16, G02B 532

Patent

active

051384701

ABSTRACT:
A head-up display for a vehicle, including a primary image reflection hologram supported by a transparent substrate located in the vehicle operator's field of view for the ambient scene in front of the vehicle, a light source for providing playback illumination to the primary image hologram, and a guard hologram in front of the primary image hologram for substantially reflecting ambient illumination that otherwise could spuriously turn on the first reflection hologram, the guard hologram having an angular bandwidth and a spectral bandwidth that are greater than the angular bandwidth and the spectral bandwidth of the primary image hologram, and having an optical density of 2.0 or greater. The guard hologram can be parallel fringe reflection hologram or a slant fringe reflection hologram.

REFERENCES:
patent: 4966426 (1990-10-01), Moss et al.
patent: 4973132 (1990-11-01), McDonald et al.
patent: 5066525 (1991-11-01), Nakamachi et al.

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