In-focus indicator for a camera

Details In-focus indicator for a camera In-focus indicator for a camera

1982-04-16

1984-08-21

Gellner, Michael L.

354406, G03B 300

Patent

active

044667264

ABSTRACT:
An in-focus indicator for a camera includes a focussing condition detector which is adapted to produce a forward focussing signal and a backward focussing signal. An RS-flipflop forms a set signal save circuit which is set at an in-focus position where a switching occurs between the levels of the forward focussing signal and backward focussing signal. When the save circuit is set, an element is activated for a given time interval to produce sound. The detector is also adapted to produce an in-focus zone signal, and the set signal save circuit is reset when the level of the in-focus zone signal changes in response to a movement of the focal point out of the in-focus zone.

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

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