Focus detection system

Details Focus detection system Focus detection system

1979-11-29

1982-06-08

Hix, L. T.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

250201, 250209, 352140, 358227, G03B 7099

Patent

active

043337163

ABSTRACT:
Disclosed is a focus detecting system in which first and second signals corresponding to image forming states at first and second positions each almost at the same distance before and behind a predetermined focal plane of an image forming optical system are obtained. A third signal corresponding to an image forming state at a third position different from the first and the second positions is also obtained. The in-focus state of the image formed by the image forming optical system is detected on the basis of a first comparison signal obtained by comparing the first and the second signals with each other, a second comparison signal obtained by comparing the first and the third signals with each other and a third comparison signal obtained by comparing the second and the third signals with each other.

REFERENCES:
patent: 2831057 (1958-04-01), Orthuber
patent: 2838600 (1958-06-01), Salinger
patent: 3532045 (1970-10-01), Genahr
patent: 3764213 (1973-10-01), O'Meara
patent: 3896304 (1975-07-01), Aoki et al.
patent: 4183642 (1980-01-01), Fukuoka

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