Focus condition detecting device

Details Focus condition detecting device Focus condition detecting device

1993-08-30

1995-02-14

Perkey, W. B.

G03B 1336

Patent

active

053899954

ABSTRACT:
The output signal trains generated through photoelectric conversion of an object image in the image sensor array are filtered to remove the DC component, generating the filtered signal trains. The difference between the value of the filtered signal trains and the predetermined value, for example, 0, is determined and the filtered signal trains are divided into a plurality of ranges on the basis of the above differential data train. A microcomputer detects the focus condition of the photographing lens for each range thus divided on the basis of the filtered signal trains.

REFERENCES:
patent: 4561749 (1985-12-01), Utagawa
patent: 4922279 (1990-05-01), Hamada et al.
patent: 4977311 (1990-12-01), Kusaka et al.
patent: 5068682 (1991-11-01), Utagawa
patent: 5138357 (1992-08-01), Utagawa

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