Iris servo apparatus

Details Iris servo apparatus Iris servo apparatus

1981-04-15

1983-10-11

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250229, 358228, G01J 120, H04N 534

Patent

active

044094728

ABSTRACT:
An iris servo apparatus comprises a first servo system (iris servo) and a second servo system (AGC circuit). When the first servo system is saturated, which state corresponds to full opening of iris, the second servo system automatically starts. That is, the second servo system does not effect gain control until the level of an output signal of the first servo system becomes sufficiently high. Switching the first servo system to the second servo system or vice versa is automatically conducted.

REFERENCES:
patent: 3123724 (1964-03-01), Schrenk et al.
patent: 3555181 (1971-01-01), Thommen
patent: 4174526 (1979-11-01), Geurts

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