Automatic focus control device

Details Automatic focus control device Automatic focus control device

1990-04-11

1991-08-13

Adams, Russell E.

354400, 3541951, G03B 1336

Patent

active

050400150

ABSTRACT:
In an automatic focus control device of a camera there are provided defocus amount calculation means for calculating a defocus amount for a predetermined focus plane of a photographic lens in the camera on the basis of the electric signal generated by a light receiving means, comparing means for comparing the obtained value on the basis of the calculated defocus amount with a reference value, control means controlling driving speed of the photographic lens by the lens driving means in response to the comparison result of a comparing means, photographic condition setting means for setting the photographic condition and reference value setting means for setting said reference value in response to the set photographic condition.

REFERENCES:
patent: 4466726 (1984-08-01), Nakajima
patent: 4470683 (1984-09-01), Nakajima
patent: 4538892 (1985-09-01), Sakai et al.
patent: 4671640 (1987-07-01), Adaka et al.
patent: 4860045 (1989-08-01), Hamada et al.
patent: 4972221 (1990-11-01), Ohnuki et al.

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