Holographic efficiency adjustment

Details Holographic efficiency adjustment Holographic efficiency adjustment

1991-03-29

1993-05-11

Arnold, Bruce Y.

Optical: systems and elements

Holographic system or element

359 9, 359900, 430 1, 430 2, G03H 108

Patent

active

052106250

ABSTRACT:
A hologram efficiency adjusting process that includes scanning the brightness effect of a hologram, which is either the hologram to be adjusted or a hologram representative of the hologram to be adjusted, to provide brightness vs. position information. The brightness information is utilized to produce a variable duty cycle half-tone mask that contains a pattern defining the areas of the hologram which are to be removed, with the pattern being unresolvable by the viewer of the hologram from which holograms have been removed pursuant to the mask pattern. The hologram to be adjusted is then photoresist coated and etched in accordance with the mask. Alternatively, the brightness information can be utilized to directly expose, for example by a laser scanner, photoresist disposed on the hologram to be adjusted.

REFERENCES:
patent: 3619022 (1971-11-01), Hirsch et al.
patent: 4960311 (1990-10-01), Moss et al.
patent: 4966428 (1990-10-01), Phillips
patent: 4969700 (1990-11-01), Haines
patent: 5003386 (1991-03-01), Doyle et al.

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