Prism camera

Details Prism camera Prism camera

1976-09-02

1978-10-10

Griffin, Donald A.

G03B 1500

Patent

active

041199804

ABSTRACT:
A compact, rigid camera for use with self-developing film utilizes a prism element having an exit face overlying the film and which is both reflective and transmissive to fold the optical path of useful light rays between an objective lens and a film plane in a relatively small volume. A prism entrance face is oriented with respect to the reflective/transmissive exit face so that entering light is totally internally reflected at the exit face to at least two other faces of the prism which are reflective and oriented to return the light to the exit face substantially along its perpendicular. The exit face is coextensive with the film plane so that the reflected light transmitted through the exit face exposes the film. In one form the exit face of the prism is planar and closely spaced from the film plane. In another form the exit face has two mutually inclined planar surfaces, each of which internally reflects one image beam and transmits another beam internally reflected from the other face. In the latter form an auxiliary emergent prism is interposed between the exit face reflective/transmissive surfaces and the film plane.

REFERENCES:
patent: 3818498 (1974-06-01), Zehrpfennig

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