Focus detection condition display device for camera

Details Focus detection condition display device for camera Focus detection condition display device for camera

1988-12-15

1991-03-19

Adams, Russell E.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

354409, 358227, G03B 1336

Patent

active

050015079

ABSTRACT:
A focus detection condition display device suitable for use in a camera provided with an electronic viewfinder. The pattern signal corresponding to a focus detection zone on which focus detection is conducted by a focus detecting system is superimposed on the video signal of the object field and said signal is output to an electronic viewfinder. When the focus detection has become impracticable for such reason as lack of contrast of the object field, or focusing has become impracticable because of the object coming too close to the camera, an alarm is issued by the pattern corresponding to a focus detection zone displayed on the electronic viewfinder displaying in a manner different from that ordinarily used.

REFERENCES:
patent: 4475800 (1984-10-01), Kinoshita et al.
patent: 4557578 (1985-12-01), Seely
patent: 4599653 (1986-07-01), Kimura et al.
patent: 4614975 (1986-09-01), Kaite
patent: 4716429 (1987-12-01), Misawa

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