Patent
1978-04-25
1980-04-29
Adams, Russell E.
354 25, G03B 300
Patent
active
042003784
ABSTRACT:
An automatic focusing camera which upon initiation of a camera cycle drives the lens to a focus position, and responsive thereto, provides an exposure operation, and termination of the camera cycle includes a jam sensor arrangement operable, responsive to a lens jam, to actuate the shutter mechanism of the camera and terminate the exposure cycle. The jam sensor arrangement, in conjunction with an auto-focus circuit, terminates the lens drive and completes the camera cycle whenever a malfunction occurs in the lens drive mechanism such that its motor is energized but the lens fails to move. In addition, the use of such a jam sensor permits the same electronic package comprising a range finder system and a lens drive mechanism to be incorporated, without significant modification, into cameras having different lens drive ranges because the jam sensor automatically provides for actuation of the shutter and ultimately, termination of the camera cycle when an attempt is made to focus on and photograph a subject outside the limits to which the lens may be moved.
REFERENCES:
patent: 3442193 (1969-05-01), Pagel
patent: 3522764 (1970-08-01), Biber et al.
patent: 3779440 (1973-12-01), Casale et al.
patent: 3798517 (1974-03-01), Whitehouse
patent: 3917142 (1975-11-01), Guarderas
Adams Russell E.
Polaroid Corporation
Thornton David R.
LandOfFree
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