In-focus state detecting device for camera

Details In-focus state detecting device for camera In-focus state detecting device for camera

1982-09-20

1984-09-25

Hix, L. T.

354409, G03B 1318

Patent

active

044732848

ABSTRACT:
An in-focus state detecting device which is provided with erroneous signal discriminating means is arranged such that: The lens cap of a photo-taking lens has the whole surface or a part of the surface thereof formed into a diffuse transmission face. With this lens cap put on the photo-taking lens, a light flux is allowed to be diffused by the diffuse transmission face to obtain a uniform brightness face at the cap. Then, a light flux from the uniform brightness face of the cap is guided to the in-focus detecting device to perform a checking operation with the discriminating means to check for an erroneous action of the device.

REFERENCES:
patent: 4252425 (1981-02-01), Aoki et al.
patent: 4264160 (1981-04-01), Aoki
patent: 4286850 (1981-09-01), Aoki
patent: 4309093 (1982-01-01), Kuwayama et al.
patent: 4329032 (1982-05-01), Aoki et al.
patent: 4381890 (1983-05-01), Wallace

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