Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1977-04-04
1978-07-11
Griffin, Donald A.
Optics: measuring and testing
Range or remote distance finding
With photodetection
354219, 356 8, G03B 1320, G03B 1302, G01C 304
Patent
active
041005554
ABSTRACT:
A combined view and rangefinder for use in cameras having a variable focus objective lens includes means for establishing a primary image of the scene to be photographed framed in a generally rectangular field of view together with a secondary focusing image superposed on the primary image and movable obliquely across the primary image in correspondence with camera focusing so that substantial coincidence between the primary and secondary images is indicative of the camera assuming a focused condition with respect to the scene to be photographed. In addition, the path of movement for the movable secondary image of the combined view and rangefinder is located above the geometric center of the primary image so as to facilitate the framing of a human photographic subject to locate the subject's head above the geometric center of the picture. The combined view and rangefinder may also be conveniently and easily assembled through snap-fitted components.
REFERENCES:
patent: 2191027 (1940-02-01), Ort
patent: 2970511 (1961-02-01), Ruhle
patent: 3057249 (1962-10-01), Miles
patent: 3529527 (1970-09-01), Leitz
patent: 3543665 (1970-12-01), Reed et al.
patent: 3782259 (1974-01-01), Noble
Griffin Donald A.
Polaroid Corporation
Roman Edward S.
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