Holographic diffusion screen and methods for the production ther

Details Holographic diffusion screen and methods for the production ther Holographic diffusion screen and methods for the production ther

1982-12-03

1986-07-29

Corbin, John K.

354201, 350320, G02B 532, G03B 300

Patent

active

046028439

ABSTRACT:
An optically-generated or computer-generated holographic diffusing screen usable in bringing an image to focus thereon is a hologram which upon reconstruction displays a substantially transparent annulus on a substantially opaque background. The annulus preferably has an outer diameter substantially equal to the exit pupil of the image-forming lens, which image is to be focused. The radial width of the transparent annular portion is very small relative to the outer diameter of the annulus. The holographic diffusion screen may be formed by making a holographic image of the substantially annular pattern or by exposing a holographic plate with two collimated mutually coherent beams of light, one beam being perpendicular to the plate while the other is at an angle with respect to the first beam, rotating the holographic recording plate a predetermined amount, and repeating the exposing and rotating steps until a predetermined number of exposures has been completed.

REFERENCES:
patent: 3619021 (1971-11-01), Biederman
patent: 3619022 (1971-11-01), Hirsch et al.
patent: 3708217 (1973-01-01), McMahon
patent: 3909111 (1975-09-01), Meyerhofer
patent: 3953105 (1976-04-01), Ih
patent: 4027327 (1977-05-01), Harada
Glaser, I., thesis: "Processing and Display of Three Dimensional Data by Optical and Holographic Methods", title, contents pages and chapter 3: pp. 3-1-3-23.

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