Stop-down signal adjusting circuit in automatic aperture control

Details Stop-down signal adjusting circuit in automatic aperture control Stop-down signal adjusting circuit in automatic aperture control

1987-07-24

1989-05-16

Gellner, Michael L.

354446, 354448, G03B 7085

Patent

active

048314005

ABSTRACT:
The oscillation wave signal generated during lens stop-down is amplified by an adjustable gain amplifier the gain of which is controlled in accordance with the peak value of the oscillation wave signal detected during a predetermined time period, to thereby maintain a substantially constant oscillation wave signal amplitude during lens stop-down.

REFERENCES:
patent: 4124825 (1978-11-01), Webb et al.
patent: 4621918 (1986-11-01), Kawasaki et al.

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