Photography – With exposure objective focusing means – focusing aid – or... – Having pursuit mode
Patent
1995-09-01
1997-03-25
Adams, Russell E.
Photography
With exposure objective focusing means, focusing aid, or...
Having pursuit mode
396133, G03B 1336
Patent
active
056149824
ABSTRACT:
An automatic focus adjustment device for use with a camera having a photographic lens. The device includes, but is not limited to, a drive unit changing the amount of extension of a photographic lens, a lens position detection unit detecting the position of the photographic lens, a position deviation detection unit detecting the position deviation between a position of a subject as imaged by the photographic lens and an imaging plane, a speed deviation calculation unit inputting the position deviation detected by the position deviation detection unit and calculating the speed deviation due to a time change of the detected position deviation, a target drive speed calculation unit which, based on the position of the photographic lens as detected by the lens position detection unit and on the position deviation detected by the position deviation detection unit, calculates a target drive position for the photographic lens and calculates a target drive speed based on the time change of the target drive position, an ideal speed setting unit which, based on the position deviation detected by the position deviation detection unit, determines the ideal speed which has been previously set, a movement decision unit determining whether the subject is a moving body, a speed selection unit selecting the target drive speed when it has been determined by the movement decision unit that the subject is a moving body and selecting the ideal speed when it has been determined by the movement decision unit that the subject is a non-moving body and a calculation unit calculating the actuation amount to be output by the drive unit based on the position deviation detected by the position deviation detection unit, the speed deviation calculated by the speed deviation calculation unit and the speed selected by the speed selection unit.
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patent: 5210562 (1993-05-01), Miyazawa et al.
Adams Russell E.
Nikon Corporation
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