Apparatus for electrically detecting focal point of cameras or t

Details Apparatus for electrically detecting focal point of cameras or t Apparatus for electrically detecting focal point of cameras or t

1979-06-26

1982-02-23

Hix, L. T.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

354 25, 354 31, 354 60A, 354152, 250201, G03B 310, G03B 1912, G01J 144

Patent

active

043166571

ABSTRACT:
An apparatus for comparing analog signals delivered from a number of light detecting elements with analog signals delivered from a digital-analog converter by means of a plurality of comparator circuits whose output analog signals are supplied as write enable signals to a plurality of digital memories which are controlled by means of digital signals delivered from a central control circuit such that an illumination intensity information of each picture element is read out as the digital signal in the digital memories, thereby obtaining a signal of detecting a focal point of cameras or the like optical devices.

REFERENCES:
patent: 2828482 (1958-03-01), Schumann
patent: 3582940 (1971-06-01), Kihlberg
patent: 3588876 (1971-06-01), Chatelon et al.
patent: 4047187 (1977-09-01), Mashimo et al.
patent: 4162839 (1979-07-01), Mashimo et al.
patent: 4173402 (1979-11-01), Horike et al.

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