Photography – With exposure objective focusing means – focusing aid – or... – Having pursuit mode
Patent
1995-05-17
1996-12-24
Gray, David M.
Photography
With exposure objective focusing means, focusing aid, or...
Having pursuit mode
G03B 1300
Patent
active
055877613
ABSTRACT:
An automatic focusing apparatus repetitively detects a defocus amount of a photographing lens, discriminates whether or not an object is moving, and calculates a pursuit correction amount for a moving object on the basis of present and previous defocus amounts. When a non-moving object is discriminated, a drive amount of the lens is calculated on the basis of the present defocus amount, and when a moving object is discriminated the drive amount is calculated on the basis of a pursuit drive amount as a sum of the present defocus amount and the pursuit correction amount. A pursuit enable/disable determining device determines whether the drive amount is calculated on the basis of the discrimination result or on the basis of the present defocus amount. When a drive direction of the lens is reversed, the pursuit enable/disable determining device causes calculation of the drive amount of the photographing lens on the basis of the present defocus amount for driving the lens in a predetermined number of drive operations after the reversal.
REFERENCES:
patent: 4537487 (1985-08-01), Taniguchi et al.
patent: 4561749 (1985-12-01), Utagawa
patent: 4588278 (1986-03-01), Horigome
patent: 4816856 (1987-03-01), Hamada et al.
patent: 4829331 (1987-05-01), Aihara
patent: 4860045 (1989-08-01), Hamada et al.
Kusaka Yosuke
Muramatsu Masaru
Utagawa Ken
Yamano Shozo
Gray David M.
Nikon Corporation
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