Light receptor device

Details Light receptor device Light receptor device

1975-10-31

1977-07-12

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250214P, 354 31, H01J 3912

Patent

active

040356345

ABSTRACT:
A pair of photocells having substantially the same characteristics and directly connected in opposite relation to each other are used as a light receptor device which gives photometric input to the exposure control unit or regulator in a camera. According to this arrangement, the composite illuminance-output characteristic provided by the pair of photocells diverges from the usual proportional relation in the high illuminance range, and this feature is advantageously utilized for iris stops in cameras.

REFERENCES:
patent: 3028499 (1962-04-01), Farrall
patent: 3240943 (1966-03-01), White
patent: 3781119 (1973-12-01), Mori
patent: 3850530 (1974-11-01), Uno et al.

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