Digital exposure meter

Details Digital exposure meter Digital exposure meter

1975-01-13

1976-11-09

Corbin, John K.

Optics: measuring and testing

Photometers

Photoelectric

354 23D, 356224, 356228, G01J 144

Patent

active

039907996

ABSTRACT:
In an exposure meter having a row of lighting elements, such as lamps or light-emitting diodes, which correspond to respective exposure values, an improvement is made in that by utilizing a capacitor-charging integrating circuit, a constant current circuit and a ring-counter, an exposure value between two neighboring steps of the above-mentioned exposure values can be indicated by lighting said two lighting elements, and in that ranges of exposure indication can be switched by shifting a dial plate, which is facing the lighting elements, in interlocking relation with a range-shifting switch for switching its circuit for range selection, thus enabling a doubling of the steps of exposure values to be indicated with a limited number of lighting elements.

REFERENCES:
patent: 2501547 (1950-03-01), Stimson
patent: 3818495 (1974-06-01), Sagara et al.
patent: 3828253 (1974-08-01), Mori
patent: 3836262 (1974-09-01), Yata et al.
patent: 3876876 (1975-04-01), Kitai et al.

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