Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1980-03-12
1982-04-27
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
354 25, G01J 136
Patent
active
043272843
ABSTRACT:
A focusing detection device is disclosed wherein an electric output obtained by sequentially driving a group of photoelectric elements disposed adjacent to one another on an imaging surface is sampled and held for part or the entirety of the output of a photoelectric converter, this held output is nonlinearized to be compared with a preceding held and nonlinearized output of part or the entirety of the output of the photoelectric converter, the compared value is sampled and held, and extreme values of the displacement of the focus of an image rendered to the photoelectric elements from this held output are derived.
REFERENCES:
patent: 3945037 (1976-03-01), Johnson
Hostetter Darwin R.
Nelms David C.
Ricoh Co. Ltd.
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