Focus indicating device for camera

Details Focus indicating device for camera Focus indicating device for camera

1980-02-21

1981-11-17

Hix, L. T.

Photocopying

Contact printing

Light boxes

354198, 354199, 354289, 354 53, 355 61, G03B 1318

Patent

active

043008267

ABSTRACT:
A focus position indicating device for a camera including an array of electrically activatable display elements such as light emitting diodes or liquid crystal elements, the number of which are activated being dependent upon the state of focusing. A drive contrast signal is converted into a digital signal and compared with the count output of a continuously-cycling digital counter. The output of the counter is also decoded into a set of signals one of which is activated for each possible state of the counter output. The decoder output signals are gated by the output of a comparator circuit with the outputs of the gates connected to drive the display elements.

REFERENCES:
patent: 4047022 (1977-09-01), Holle
patent: 4089012 (1978-05-01), Kawasaki
patent: 4142788 (1979-03-01), Matsumoto

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