Camera focus detecting device

Details Camera focus detecting device Camera focus detecting device

1980-02-04

1982-09-14

Rubinson, G. Z.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

354 31, 354195, 250201, G03B 708

Patent

active

043492541

ABSTRACT:
A focus detecting device for a camera in which at least first and second groups of light receiving elements are disposed in planes parallel to each other and to the plane of the film in the camera. The absolute values of the difference between the signals from adjacent elements in each group are summed from which is determined the amount of high frequency components in the frequency spectrum of the image being photographed. From this, a processing circuit produces a signal representative of correct focalization when the amounts of the high frequency components are higher than a predetermined level and are equal to each other.

REFERENCES:
patent: 3450883 (1969-06-01), Thomas
patent: 4005443 (1977-01-01), Albrecht
patent: 4214826 (1980-07-01), Uchida
patent: 4220850 (1980-09-01), McEachern
IBM Technical Disclosure Bulletin, vol. 15, No. 2, Jul. 1972, pp. 504, 505, Optical Surface Microtopography Measurement and for Automatic Focussing.

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