Automatic focus device

Details Automatic focus device Automatic focus device

1996-12-11

1998-04-28

Malley, Daniel P.

Photography

With exposure objective focusing means, focusing aid, or...

Lens characteristic compensating

396 89, 396 79, G03B 300

Patent

active

057458049

ABSTRACT:
An automatic focus device capable of optimum focus lens driving control corresponding to the magnitude of the positional error of the focus lens. The automatic focus device specifies the target position of the focus lens based on information relating to the defocus distance of the focus lens, the velocity of the subject image, the current position of the focus lens and controls the driving power of the focus lens based on non-linear functions of the positional error defined as the difference between the target position and the current position of the focus lens.

REFERENCES:
patent: 4560864 (1985-12-01), Kinoshita et al.
patent: 4728980 (1988-03-01), Nakamura et al.
patent: 4837594 (1989-06-01), Nakamura et al.
patent: 4931820 (1990-06-01), Matsuzawa et al.

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