Focus controller, optical apparatus using the same, and...

Details Focus controller, optical apparatus using the same, and... Focus controller, optical apparatus using the same, and...

2008-12-30

2010-06-08

Koval, Melissa J (Department: 2862)

Photography

With exposure objective focusing means, focusing aid, or...

Lens drive circuit or motor structure

Reexamination Certificate

active

07734167

ABSTRACT:
A focus controller configured to control focus of an optical system that has a focus lens includes a switching circuit configured to select a first driver for the electrization to a coil of a motor in performing focus control using a first focus detector, and to select a second driver in an electrization to the coil of the motor in performing focus control using a second focus detector. The first driver is configured to switch an electrization to the coil in the motor according to an output of the position sensor. The second driver is configured to switch an electrization to the coil of the motor according to a determined time interval.

REFERENCES:
patent: 6999684 (2006-02-01), Sato et al.
patent: 2009/0189990 (2009-07-01), Kiyamura et al.
patent: 2009/0190910 (2009-07-01), Yasuda et al.
patent: 09-331666 (1997-12-01), None
patent: 2004-109690 (2004-04-01), None

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