Automatic focusing device for camera

Details Automatic focusing device for camera Automatic focusing device for camera

1988-09-16

1989-06-20

Adams, Russell E.

354400, 354408, 354286, G03B 300

Patent

active

048413259

ABSTRACT:
An automatic focusing device for use in camera lens systems comprises lens means such as a zoom lens for forming the image of an object, detecting means for detecting the amount of defocus of the image of the object formed by the lens means from a predetermined plane such as a film surface, memory means for storing at least one value of conversion coefficient and at least one value of correction coefficient which is used in a calculation for correcting the conversion coefficient, calculating means for correcting the conversion coefficient in accordance with the amount of defocus and the correction coefficient and for calculating the driving amount of at least a portion of the lens means on the basis of the corrected conversion coefficient and the amount of defocus, and lens driving means for driving at least a portion of the lens means, e.g., the front lens group of a zoom lens, in accordance with the driving amount calculated by the calculating means. Disclosed also a lens system, as well as a camera, incorporating this automatic focusing device.

REFERENCES:
patent: 4474449 (1984-10-01), Kusaka
patent: 4509846 (1985-04-01), Nakai et al.
patent: 4537487 (1985-08-01), Taniguchi et al.
patent: 4550993 (1985-11-01), Taniguchi et al.

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