Method of focus detection

Details Method of focus detection Method of focus detection

1982-08-24

1985-01-01

Perkey, William B.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

250204, G03B 708, G01J 144

Patent

active

044914024

ABSTRACT:
A method of focus detection is disclosed, in which at least two pairs of light receiving element rows are arranged with respect to a photographing lens, and light splitters, each of which wave front splits the light flux from the photographing lens into two light fluxes, are provided for the respective light receiving element rows in the light receiving element row pairs. Light intensity distributions detected by the light receiving element rows at least between two light receiving element row pairs are compared to determine whether an image forming plane is in pre- or post-focus or in focus. Contrast signal values of the object image detected from the light receiving element rows between the light receiving element rows of at least one of the light receiving element row pairs are compared to determine whether the image forming plate is in pre- or post-focus or in focus. The result of at least either comparison is used for focus adjustment.

REFERENCES:
patent: 4083056 (1978-04-01), Nakamura et al.
patent: 4349254 (1982-09-01), Jyojiki et al.

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