Photography – With exposure objective focusing means – focusing aid – or... – Having pursuit mode
Patent
1995-06-29
1997-07-29
Metjahic, Safet
Photography
With exposure objective focusing means, focusing aid, or...
Having pursuit mode
G03B 310, G03B 1334, G03B 1516, G03B 3900
Patent
active
056529244
ABSTRACT:
An automatic focus adjustment device is provided for focusing on a moving object with precision. The automatic focus adjustment device includes a photographic lens driver assembly to vary the forwarding amount of the phototaking lens assembly. A focus detection assembly detects the defocus amount of the subject image plane. An image plane velocity computation assembly computes the moving velocity of the subject image plane based on the defocus amount. A lens drive control assembly controls the photographic lens driver assembly based on the moving velocity of the subject image plane and the defocus amount. An adaptive controller reduces an instruction amount corresponding to the defocus amount for controlling focus adjustment when the detected defocus amount and the computed moving velocity have opposite arithmetic signs.
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patent: 5270763 (1993-12-01), Ogasawara
patent: 5327190 (1994-07-01), Nakamura et al.
patent: 5392088 (1995-02-01), Abe et al.
patent: 5434621 (1995-07-01), Yu
Metjahic Safet
Nelson Eric
Nikon Corp.
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