Method and apparatus for making wide exit pupil viewable hologra

Details Method and apparatus for making wide exit pupil viewable hologra Method and apparatus for making wide exit pupil viewable hologra

1978-04-10

1981-08-11

Stern, Ronald J.

350 383, 350 384, G03H 130, G03H 122

Patent

active

042831091

ABSTRACT:
In a method and apparatus for recording a holographic image on a photosensitive medium or film which is capable of being viewed from a wide vertical viewing angle when illuminated by incoherent light, a source of coherent light (10) is divided by splitter (14) into a reference beam (16) and an image or object beam (18). The image beam is directed toward the object, either a transparency (20) or a three-dimensional object (20a), and the image thereof is focused in the vertical plane by means of an anamorphic lens (30) onto a vertical dispersion element (35) and the image thereon is gathered and focused in the vertical plane by means of anamorphic lenses (36 and 38) onto the film (40). In the horizontal plane, the image is focused by an anamorphic lens (42) onto a horizontal exit pupil forming means which may include horizontal dispersion element (45) and the light therefrom is directed onto the film (40). The reference beam (16) is directed onto the film from either the back or the front at a predetermined angle in a vertical plane. The holographic image may be recorded in full color by simultaneously or sequentially generating coherent light in the primary colors and directing the reference beam of each color onto the film at a unique predetermined angle in a vertical plane. The image is reconstructed by directing incoherent light onto the film at the same angles in the vertical plane as the reference beam.

REFERENCES:
patent: 3625584 (1971-12-01), St. John
patent: 3834785 (1974-09-01), Kimura
patent: 4039245 (1977-08-01), Yano
patent: 4067638 (1978-01-01), Yano et al.

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