Off-photometric-range indicator for exposure meter

Details Off-photometric-range indicator for exposure meter Off-photometric-range indicator for exposure meter

1977-05-13

1978-04-18

Hix, L. T.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

250214P, 356226, G03B 700, G01J 144

Patent

active

RE0296155

ABSTRACT:
An off-photometric-range indicating device for photometric circuits for cameras visually indicates to a photographer when the brightness of an object to be photographed is off the set photometric range of the photometric circuit. The indicating device includes a detection circuit to detect the brightness of the object and to produce an output signal when the detected value of the brightness is out of the photometric range of the photometric circuit, a switching circuit connected to the detection circuit and operated by said output signal, and a circuit connected to the switching circuit and actuated by the operation of the switching circuit to scale out the indicator, which may be visually observed by the photographer.

REFERENCES:
patent: 3620142 (1971-11-01), Engelsmann et al.
patent: 3712192 (1973-01-01), Ono et al.
patent: 3818495 (1974-06-01), Sagara et al.

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