Automatic focusing device

Details Automatic focusing device Automatic focusing device

1994-02-09

1996-05-28

Perkey, W. B.

G03B 1336

Patent

active

055216722

ABSTRACT:
A defocus amount of an object is detected by a focus detection unit of a camera, whereby a defocus velocity is calculated according to the detected amount. An average velocity is calculated using a plurality of defocus velocities and then a smoothing velocity is calculated, whereby a reversed position of a velocity direction is detected using the data. An average velocity, a smoothing velocity, and the time of a velocity direction reversed are calculated, whereby a correction velocity is obtained according to the calculation. A driving amount of lens is calculated according to the calculated correction velocity, whereby the photographic lens is driven by the lens driving device so as to follow the moving of an object.

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patent: 5223886 (1993-06-01), Ishida et al.

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