Method of electrically detecting focal point of cameras or the l

Details Method of electrically detecting focal point of cameras or the l Method of electrically detecting focal point of cameras or the l

1979-06-26

1981-03-10

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

354 25, G01J 136

Patent

active

042556546

ABSTRACT:
A method of 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: 3988747 (1976-10-01), Lermann et al.
patent: 4173402 (1979-11-01), Horike et al.
patent: 4185191 (1980-01-01), Stauffer

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