Lens stop braking in automatic exposure cameras of stop value co

Details Lens stop braking in automatic exposure cameras of stop value co Lens stop braking in automatic exposure cameras of stop value co

1977-09-06

1979-12-18

Gellner, Michael L.

354 43, 354271, G03B 708, G03B 906

Patent

active

041792017

ABSTRACT:
An automatic exposure camera of the stop value control type is provided with lens stop braking to improve the accuracy of the lens stopping operation while at the same time maintaining a high operating speed. A brake magnet mechanism is provided for decelerating the lens stopping mechanism in response to a control circuit. In one form, the control circuit operates the brake magnet mechanism to effect deceleration slightly before the quantity of light reaches a suitable exposure value. Thereafter, when a stop value providing a suitable exposure value is obtained, stopping the lens stopping operation can be done with very high accuracy. In another form, the control circuit compares the variation in light due to the change in aperture with a variation rate to control the energization and de-energization of the brake magnet. In this way, the non-linear operation which is particularly evident at minimal aperture values is eliminated.

REFERENCES:
patent: 3820131 (1974-06-01), Tanaka
patent: 3868702 (1975-02-01), Strauss et al.
patent: 3921186 (1975-11-01), Lermann

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