Patent
1975-03-03
1976-08-24
Hix, L. T.
354 29, 354271, G03B 902, G03B 924
Patent
active
039770141
ABSTRACT:
An exposure control apparatus is provided for a photographic camera of the type suitable for use with a source of artificial illumination and includes a follow focus system for determining a maximum exposure aperture in correspondence with lens focusing as a direct function of camera to subject distance. The maximum exposure aperture is determined by the position of an interceptor which is rotated about a select pivot point by the coaction of a cam follower engaged by a cam surface. The cam surface moves in concert with lens focusing in a manner whereby a predetermined number of degrees rotation of the interceptor about the select pivot point corresponds to a predetermined number of F stop changes in the determined maximum exposure aperture. There may also be included means for selectively trimming the determined maximum aperture size defining position of the interceptor by rotating the interceptor about its select pivot point without displacing the cam follower along its associated cam surface.
REFERENCES:
patent: 3478660 (1969-11-01), Land
patent: 3641891 (1972-02-01), Burgarella
patent: 3750543 (1973-08-01), Eloranta et al.
patent: 3832722 (1974-08-01), Douglas
Hix L. T,.
O'Connor E. M.
Polaroid Corporation
Roman Edward S.
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