Auto focus controlling system

Details Auto focus controlling system Auto focus controlling system

1992-02-12

1992-10-06

Adams, Russell E.

354400, 354408, G03B 1336

Patent

active

051536307

ABSTRACT:
A dynamic servo-controlled auto-focusing system for a camera lens, in which range finding and lens driving operations overlap, comprises a light receiving element or a charge storage sensor, a computing element for computing defocus information corresponding to a postional relation between a subject image and a predetermined plane by processing output data of the light receiving element, a driving element for servoing the camera lens to a focused position according to information from the computing element, and a lens movement detecting element for detecting movement of the camera lens in real time. In a preferred mode of operation, the equivalent lens position for the range finding portion of each cycle is determined on a time-weighted mean basis. At the completion of each cycle, the current position of the driven lens relative to the equivalent position during range finding is determined, and the difference is applied to the defocus amount corresponding to the equivalent position, thereby to obtain a corrected defocus amount corresponding to the current position of the lens. The lens is then driven according to the corrected defocus amount in the next servo cycle.

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patent: 4812636 (1989-03-01), Kusaka et al.
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