Focus detecting device in single lens reflex camera

Details Focus detecting device in single lens reflex camera Focus detecting device in single lens reflex camera

1978-11-27

1981-05-05

Hix, L. T.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

354 25, 354 31, 250204, G03B 310

Patent

active

042655200

ABSTRACT:
A focus detecting device in a single lens reflex camera having a lens system and an optical image splitter for splitting an object image into various partial images disposed at a position optically equivalent to that of a film surface in said single lens reflex camera. An array of photo-electric conversion devices are arranged into at least two rows, each row having a plurality of photo-electric conversion elements. The rows are disposed symmetrically with respect to a center line. The device includes an image projecting device for projecting the partial images onto the photo-electric conversion arrays. The projecting device has an optical axis which optically corresponds to said center line, the output of said conversion array defined by ##EQU1## The output of the conversion array has a maximum value when proper focus is obtained. In the equation: n is the number of said photo-electric conversion elements, p is the parameter of the mutual positional relationship of said photo-electric conversion elements for obtaining output difference, m is the element number of said photo-electric conversion elements, i and i' are outputs corresponding to incident light quantities of photo-electric conversion elements in said rows, and l is an integer defined by 1.ltoreq.l.ltoreq.(n-1) and in the range of p.

REFERENCES:
patent: 3898676 (1975-08-01), Hosoe et al.
patent: 3938894 (1976-02-01), Nanba
patent: 3945023 (1976-03-01), Stauffer
patent: 4047187 (1977-09-01), Mashimo et al.
patent: 4083056 (1978-04-01), Nakamura et al.
patent: 4133606 (1979-01-01), Hosoe et al.
patent: 4176928 (1979-12-01), Nakamura et al.

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