Patent
1976-03-01
1977-11-29
Gonzales, John
354219, 354289, G03B 300, G03B 1302
Patent
active
040608174
ABSTRACT:
Photographic apparatus including an indicating device bearing indicia for relating to the operator a distance at which a variable focusing lens assembly of the apparatus is focused. The indicating device is coupled to a focusing control system of the apparatus for movement therewith as the lens assembly is moved between distant and nearmost foci to bring the camera into coincidence with a predetermined estimation of a camera-to-subject distance for a photographic scene.
In a preferred embodiment, an image of the indicia is presented in or beneath a field of view of a viewfinder mounted upon the apparatus and serves as a reminder to the operator of the distance at which the lens assembly is focused whereby an error in the focused position of the lens assembly is made obvious to the operator and a proper correction can be made before the shutter of the apparatus is released.
REFERENCES:
patent: 2936690 (1960-05-01), Whitman
patent: 3046863 (1962-07-01), Bretthauer et al.
patent: 3478660 (1969-11-01), Land
patent: 3583300 (1971-06-01), Johnson et al.
patent: 3914777 (1975-10-01), Slavitter
patent: 3971052 (1976-07-01), Plummer
"Theory & Design of Long-Deflection Constant-Force Spring Elements", By Votta & Lansdale in Transactions of ASME, May, 1952, pp. 439-444.
Anderson Kenneth W.
Gonzales John
Polaroid Corporation
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