Automatic focus detecting circuit

Details Automatic focus detecting circuit Automatic focus detecting circuit

1984-02-24

1986-12-16

Lev, Robert G.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358213, H04N 326

Patent

active

046301216

ABSTRACT:
An automatic focus detecting circuit in which dark current is completely compensated for. At least one element of an array of photoelectric elements is shielded from light to obtain a photoelectric output corresponding to a dark current component. The entire array is scanned, and the output corresponding to the dark current component derived from the shielded element is sampled and held. The sampled-and-held output is subtracted from the outputs of all of the other elements to obtain a final output compensated completely for dark current.

REFERENCES:
patent: 4301478 (1981-11-01), Sakane et al.
patent: 4366501 (1982-12-01), Tsunekawa et al.
patent: 4484223 (1984-11-01), Tsunekawa
patent: 4489350 (1984-12-01), Kimura

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