Focus detecting device for single-lens reflex cameras

Details Focus detecting device for single-lens reflex cameras Focus detecting device for single-lens reflex cameras

1976-08-26

1978-04-04

Wintercorn, Richard A.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

354 31, 354 53, 354 60E, 354 60L, 354201, 250201, G03B 708

Patent

active

040830560

ABSTRACT:
In a single lens reflex camera a focus detecting device is provided to identify or control the in-focus condition of a lens. The detecting device operates on the same principle as that used in visual focusing, namely the bringing together of a split image or the observation of the clarity of an image or both. A group of photo-electric light detecting elements is positioned to receive a part of the object's image, which part corresponds to that watched by the photographer in determining an in-focus condition. For split image focusing the group is divided into two lines of elements located adjacent to and on opposite sides of the line splitting the image. Each line of elements effectively measures the spatial light intensity impinging thereon. When the spatial light intensity detected by both lines are the same, an in-focus condition is detected. For image clarity focusing the adjacent elements of a line of photo electric elements are connected so as to subtractively combine their photo current outputs. Thus a maximum output is achieved when the image has maximum clarity. A combination of both techniques is particularly suitable for providing increased accuracy of detection.

REFERENCES:
patent: 3274914 (1966-09-01), Biedermann et al.
patent: 3733989 (1973-05-01), Wick et al.
patent: 3762294 (1973-10-01), Kosaka et al.
patent: 3827064 (1974-07-01), Kiyohara et al.
patent: 3860935 (1975-01-01), Stauffer
patent: 3938894 (1976-02-01), Nanba
patent: 4047187 (1977-09-01), Mashimo et al.

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