Exposure control device for camera

Details Exposure control device for camera Exposure control device for camera

1997-12-02

1999-07-27

Perkey, W. B.

Photography

Exposure control circuit

Diaphragm function only

361159, 335229, G03B 7085, H01F 718

Patent

active

059305355

ABSTRACT:
Disclosed is an exposure control device for a camera. The exposure control device has a magnetic plunger including a permanent magnet and a plunger coil. The plunger coil generates, when energized, a magnetic field which weakens a magnetic force of the permanent magnet. A resistor is connected in parallel with the plunger coil. Resistance of the resistor is substantially equal to a DC resistance of the plunger coil.

REFERENCES:
patent: 3790264 (1974-02-01), Heinrich
patent: 3797028 (1974-03-01), Miyakawa et al.
patent: 3922693 (1975-11-01), Matsui
patent: 4396272 (1983-08-01), Shono et al.
patent: 4458289 (1984-07-01), Lukasczyk
patent: 4514075 (1985-04-01), Negishi et al.
patent: 4769553 (1988-09-01), Tomita
patent: 5347186 (1994-09-01), Konotchick

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