Focus detection apparatus for a camera

Details Focus detection apparatus for a camera Focus detection apparatus for a camera

1984-05-03

1986-07-22

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250204, 354408, G02B 711

Patent

active

046021531

ABSTRACT:
A focusing detection apparatus comprises an optical system for forming a plurality of images a relative positional relation of which changes in accordance with a focusing state of an object lens, a sensor for producing signals representing the images by detecting the images by a plurality of photo-electric elements, and arithmetic circuitry for determining the focusing state of the object lens based on the signals from the sensor. In order to determine the focusing state, the arithmetic circuitry carries out an operation of ##EQU1## where V is a correlation, a(i) and b(i) are outputs of i-th photoelectric element of the sensor for the respective images, and {x.quadrature.y} is a constant operational relationship for two real numbers x and y.

REFERENCES:
patent: 4047022 (1977-09-01), Holle
patent: 4250376 (1981-02-01), Joseph et al.
patent: 4251143 (1981-02-01), Stemme et al.
patent: 4297571 (1981-10-01), Utagawa et al.
patent: 4333007 (1982-06-01), Langlais et al.

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