Prism reflector for optical projector/reader

Details Prism reflector for optical projector/reader Prism reflector for optical projector/reader

1975-08-13

1976-10-26

Stern, Ronald J.

350299, G02B 504, G02B 508

Patent

active

039880575

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 at 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.
In one preferred embodiment the prism further includes a third, metal coated reflecting surface which is co-planar with the exit surface for receiving a minor portion of the light beam reflected by the first reflecting surface and for reflecting it to tne second reflecting surface.

REFERENCES:
patent: 2472600 (1949-06-01), Luboshez
patent: 3720463 (1973-03-01), Taylor

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