Focus state indicator

Details Focus state indicator Focus state indicator

1982-09-21

1984-04-17

Gellner, Michael L.

354403, G03B 300

Patent

active

044430876

ABSTRACT:
A focus state indicator for a camera is provided such that the photographer may know a focus state in accordance with electrical signals respectively corresponding to the lens position in the previous focusing operation and a distance between a camera and a subject to be photographed. A circuit is arranged to generate a differential signal between the output electrical signals. The alarm operation of an alarm element is continuously changed between focused and out of focused states in accordance with the differential signal, so that the photographer can know the focus state.

REFERENCES:
patent: 4358190 (1982-11-01), Sakai
patent: 4361390 (1982-11-01), Yamada

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