Lens control apparatus, lens control method and camera

Details Lens control apparatus, lens control method and camera Lens control apparatus, lens control method and camera

2005-10-11

2005-10-11

Gray, David M. (Department: 2851)

Photography

Having variable focal length of camera objective

Power zoom

C396S082000

Reexamination Certificate

active

06954589

ABSTRACT:
A lens control apparatus with which a lens can be moved accurately to a target position is disclosed. The lens control apparatus comprises a position sensor that outputs a detection signal that changes periodically in accordance with a movement of the lens; a first calculation unit that calculates a differential value between a phase component of position detection data that have been obtained based on a detection signal of the position sensor when the lens has been moved to a predetermined reference position and a phase component of position control data for controlling the position of the lens and corresponding to the reference position and a second calculation unit that calculates the target position in the position control data based on the position detection data and the differential value.

REFERENCES:
patent: 5204710 (1993-04-01), Tsukamoto et al.
patent: 5406345 (1995-04-01), Hirasawa
patent: 5687403 (1997-11-01), Ohtake
patent: 6115552 (2000-09-01), Kaneda
patent: 2003/0030920 (2003-02-01), Okawara

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