Photography – With exposure objective focusing means – focusing aid – or... – Having pursuit mode
Reexamination Certificate
2011-08-16
2011-08-16
Laballe, Clayton E (Department: 2862)
Photography
With exposure objective focusing means, focusing aid, or...
Having pursuit mode
C396S096000
Reexamination Certificate
active
08000591
ABSTRACT:
An automatic focusing apparatus includes: a focus detector photoelectrically converting at least a part of a photographing beam; a defocus computer calculating a defocus amount based on an output of the focus detector; a driver driving a focus lens based on the defocus amount; and a unit setting a maximum time period for charge accumulation in the focus detector. If the accumulated charge in the focus detector reaches a threshold within the period, when the accumulated charge in the focus detector reaches the threshold, the defocus computer calculates a defocus amount using an output of the focus detector and outputs the defocus amount to the driver. If the accumulated charge in the focus detector does not reach the threshold within the period, when the period lapses, the defocus computer calculates a defocus amount using an output of the focus detector and outputs the defocus amount to the driver.
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Karasawa, Katsumi. “Automatic Focusing Apparatus”, Specification and Drawings of unpublished related co-pending U.S. Appl. No. 12/769,223, filed Apr. 28, 2010. pp. 1-31.
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Canon Kabushiki Kaisha
Hancock Dennis
LaBalle Clayton E
Rossi Kimms & McDowell LLP
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