The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 10, 1978
Filed:
Sep. 02, 1976
James G Baker, Winchester, MA (US);
Polaroid Corporation, Cambridge, MA (US);
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.