Switch means for cameras

Details Switch means for cameras Switch means for cameras

1976-04-22

1978-03-14

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307218, 307308, 338 99, 338114, 200211, 200264, 200265, H03K 1716

Patent

active

040792692

ABSTRACT:
A switch means for electrically operating a device in a photographic camera is composed of a mechanical switch and a semiconductor switching element connected with the mechanical switch. The mechanical switch has a pair of contacts made of resilient conductive material and increases its conductivity as the pressure applied thereto increases. By the increase of the conductivity of the mechanical switch an input voltage supplied to the semiconductor switching element is raised and the switching element is turned on when the input voltage has reached a predetermined level. Thus, chattering and large consumption of electric power are prevented.

REFERENCES:
patent: 3123792 (1964-03-01), Klemm
patent: 3226568 (1965-12-01), Samwel
patent: 3239687 (1966-03-01), Steele
patent: 3386067 (1968-05-01), Costanzo
patent: 3588525 (1971-06-01), Hatsukano et al.
patent: 3758733 (1973-09-01), Durocher et al.
patent: 3875434 (1975-04-01), Harden et al.

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