1978-09-11
1985-03-12
Gellner, Michael L.
3542891, G03B 1738
Patent
active
045041334
ABSTRACT:
A camera includes a manually adjustable photographic parameter such as diaphragm aperture, shutter speed, focus distance or the like and an electrically energizable network indicating the value of the adjusted parameter or a related value. The indicator network is connected through a normally open signal controlled semiconductor switch to a current source and a device is located on the manually accessible face of the photographic parameter adjusting member and is electrically connected to the switch network input and is touch responsive to produce of switch network closing signal so as to automatically energize the indicator network upon manual engagement of the adjusting member. The sensing member is alternatively a pair of spaced conductor electrodes or a piezo-electric element and the switch is respectively responsive to resistance or voltage values applied to its input. A network is provided for opening the closed switch after a predetermined period.
REFERENCES:
patent: 3741089 (1973-06-01), Takada et al.
Kobori Toshio
Kogure Yasuzi
Nakai Masaaki
Sahara Masayoshi
Gellner Michael L.
Minolta Camera Kabushiki Kaisha
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