Lens stop auxiliary brake control device in automatic exposure c

Details Lens stop auxiliary brake control device in automatic exposure c Lens stop auxiliary brake control device in automatic exposure c

1978-02-01

1979-02-13

Hix, L. T.

354271, G03B 708, G03B 906

Patent

active

041392906

ABSTRACT:
An auxiliary brake control device for use in an automatic exposure camera of the lens stop value control type permits the lens stop operation to be controlled with high accuracy without substantially increasing the lens stop operation time. The auxiliary brake control device is controlled by comparing the variation rate in the measured light which passes through the lens stop with a preset value. In this way, lenses which have different characteristic variation rates can be freely interchanged.

REFERENCES:
patent: 3657987 (1972-04-01), Babcock et al.
patent: 3757655 (1973-09-01), Kobayashi et al.
patent: 3820131 (1974-06-01), Tanaka
patent: 3921186 (1975-11-01), Lermann

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