Optical projector/reader

Details Optical projector/reader Optical projector/reader

1074-10-29

1976-03-02

Aegerter, Richard E.

Optics: image projectors

Composite projected image

Plural projection paths with single light source

353 33, 353 27R, 350291, 350286, G03B 2110

Patent

active

039414671

ABSTRACT:
Light from a bulb is projected through the microfiche transparency by a condensor and a projection lens system and the projected image therefrom is passed through a prism to viewing screen means. The prism has a flat or curved, transparent entrant surface for receiving the projected image, a flat, transparent exit surface facing the viewing screen means, a first, metal coated reflecting surface opposite to the entrant surface and forming a predetermined acute angle with the exit surface such that a major portion of the light beam passing through the entrant surface is reflected by the first reflecting surface to the exit surface at an incident angle greater than the critical angle for total internal reflection by the exit surface and a second, metal coated reflecting surface angularly facing the exit surface for returning the light beam reflected internally by the exit surface back to the exit surface at an incident angle which is less than the critical angle such that the returned light beam passes through the exit surface to impinge on the viewing screen means.

REFERENCES:
patent: 3054326 (1962-09-01), Giesecke
patent: 3711188 (1973-01-01), Zehnpfenning
patent: 3814514 (1974-06-01), Douglas et al.

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