Focus condition detecting device

Details Focus condition detecting device Focus condition detecting device

1995-01-23

1996-01-02

Perkey, W. B.

G03B 1336

Patent

active

054813298

ABSTRACT:
A focus condition detecting device comprises an object judgment means to judge an object pattern condition on the basis of the output signal provided by the image sensor in proportion to the object light in a photographing field having passed through the photographing lens and an operation means to detect the focus condition by means of a selected method which is either a first operation method in which the focus condition of the photographing lens is detected on the basis of the data obtained through first filtering of the output signal or a second operation method in which the focus condition of the photographing lens is detected on the basis of the data obtained through second filtering of the output signal according to the judgment result of the object judgment means. For example, in the first filtering, the DC component is completely removed, while in the second filtering, the DC component is not completely removed.

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
patent: 5367153 (1994-11-01), Suda et al.

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