Catadioptric projection lantern

Details Catadioptric projection lantern Catadioptric projection lantern

1987-07-10

1988-10-04

Haroian, Harry N.

Optics: image projectors

Unitary plural refracting surfaces

353 67, G03B 2106

Patent

active

047752327

ABSTRACT:
In the particular embodiments described in the specification, a transparency projector includes a transparent sheet having one surface formed with a field of corner reflectors in which corresponding surfaces of each of the corner reflectors are deviated from orthogonality. A transparency adjacent to the retrodirectional reflector sheet is illuminated by a light source adjacent to a projection lens and light reflected from the retrodirectional reflector sheet back through the transparency forms images of the light source at positions on each side of the light source which are within the aperture of the projection lens. A transparency having three-dimensional ink spots which form dioptric lenticules can be projected by the transparency projection system without degradation of color.

REFERENCES:
patent: 1743834 (1930-01-01), Stimson
patent: 3293982 (1966-12-01), Appeldorn
patent: 3401593 (1968-09-01), Actman
patent: 3525566 (1970-08-01), Actman
patent: 3935359 (1976-01-01), Rowland
patent: 4526439 (1985-07-01), Okoshi
patent: 4618518 (1986-10-01), Pricone

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