Title:
STEPPING MOTOR DRIVE CONTROL METHOD, LENS DRIVE CONTROL DEVICE, AND LENS DRIVE CONTROL METHOD
Document Type and Number:
WIPO Patent Application WO/2007/138856
Kind Code:
A1
Abstract:
It is possible to obtain a high rotation accuracy and a high stop accuracy when
driving a stepping motor for lens movement by the 1-2-phase excitation drive
method. In a lens origin position detection process, when a lens holder has reached
the PI position, the stepping motor (4) is stopped in a 2-phase excitation pattern
capable of giving the most stable magnetic force to a magnetization rotor. Accordingly,
even when the lens holder is driven by the 1-2-phase excitation drive method of
the stepping motor (4) of a small diameter, it is possible to always obtain a high
rotation accuracy and a high stop accuracy.
Inventors:
KAMO TOMONORI
OZAKI MASAAKI
OZAKI MASAAKI
Application Number:
PCT/JP2007/060008
Publication Date:
December 06, 2007
Filing Date:
May 16, 2007
Export Citation:
Assignee:
SHARP KK (JP)
KAMO TOMONORI
OZAKI MASAAKI
KAMO TOMONORI
OZAKI MASAAKI
International Classes:
G02B7/08; G02B7/04; H02P8/32
Foreign References:
| JPH0646597A | 1994-02-18 | |||
| JP2005055706A | 2005-03-03 | |||
| JPH04195110A | 1992-07-15 | |||
| JPH05163988A | 1993-06-29 |
Attorney, Agent or Firm:
TANAKA, Mitsuo et al. (IMP Building3-7, Shiromi 1-chome,Chuo-ku, Osaka-sh, Osaka 01, JP)
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