Photographic camera with interchangeable lens

Details Photographic camera with interchangeable lens Photographic camera with interchangeable lens

1976-11-08

1978-12-19

Gonzales, John

354202, 354286, G03B 1700

Patent

active

041303580

ABSTRACT:
A photographic camera has an interchangeable lens movable from a first or fully seated position on the camera body to a second disengaged position whereupon it may be removed from the camera body. An electric warning signal device has a circuit containing a switch responsive to the position of the interchangeable lens in such a way that the switch is closed to activate the warning signal as soon as the interchangeable lens begins to move away from its fully seated position. In a further development of the invention there is also a second switch in series with the first switch, and this second switch is kept closed so long as the interchangeable lens is in its first position or is in an intermediate position between its first and second positions, and this second switch is opened when the interchangeable lens reaches its second position disengaged from the camera body and ready to be removed therefrom. This second switch opens the circuit and saves drain on the battery when the interchangeable lens is completely removed from the camera.

REFERENCES:
patent: 2975688 (1961-03-01), Harter
patent: 4051495 (1977-09-01), Rentschler et al.

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