Compact camera with prism folded optical path

Details Compact camera with prism folded optical path Compact camera with prism folded optical path

G - Physics

03

B

95/43, 88/99

G03B 17/17 (2006.01) G03B 17/52 (2006.01)

Patent

CA 1088795

ABSTRACT OF THE DISCLOSURE A compact, rigid camera has a folded optical path between an object- ive lens and a film plane and formed at least in part with a prism element having an entrance face, an exit face overlying and closely spaced from the film plane, and a reflective face. The exit face both reflects light which enters the prism at the entrance face and transmits light out of the prism. The reflective face is inclined to return to the exit face, for transmission to the film plane, the entering light internally reflected at the exit face. The entrance face of the prism is inclined relative to the reflective/trans- missive face by an angle larger than the relative inclination of the re- flective face. Light transmitting prism surfaces, spacings between optical elements, light absorptive coatings, and mechanical light controlling elements including a light collimator, prevent the entry of unwanted non- functional light into the prism and eliminate such light that does enter the prism. In a preferred form, the prism is of a transparent, low dis- persion plastic material, and the exit face is at least coextensive with the film plane.

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