Title:
DRIVING DEVICE AND AMOUNT-OF-LIGHT ADJUSTING UNIT
Document Type and Number:
Japanese Patent JP3950756
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To enable a state of a non-driving member interlocked with a rotation of a magnet to be set as three states by setting the rotating state of the magnet to the three states by switching a coil energizing control to a non-energizing, positive energizing or negative energizing.
SOLUTION: A driving device includes the magnet 1 divided in the circumferential direction and alternatively magnetized in different polarities, a coil 2, a first magnetic pole part 3 of a comb-tooth shape energized by the coil, and a second magnetic pole part 4 of a comb-tooth shape energized by the coil. A condition of "-0.333X+0.9<Y" is set to be satisfied, wherein A is an angle of one of each magnetic pole of the comb-tooth shape, B is an angle of one pole of the magnet 1, Y is "A/B", and X is a value of a ratio of the length of the outer periphery of one pole of the magnet to the thickness of the magnet in a virtual axis direction.
Inventors:
Miyawaki Makoto
Application Number:
JP2002200993A
Publication Date:
August 01, 2007
Filing Date:
July 10, 2002
Export Citation:
Assignee:
Canon Inc
International Classes:
G03B9/02; H02K33/16; G03B9/04; G03B9/06; G03B9/08; G03B9/10; G03B9/14; G03B9/22; H02K1/27; H02K3/04; H02K21/12; H02K26/00; H04N5/225; (IPC1-7): H02K33/16; G03B9/02; G03B9/04; G03B9/06; G03B9/10; G03B9/22
Domestic Patent References:
| JP3118527A | ||||
| JP55087187U |
Attorney, Agent or Firm:
Minoru Nakamura
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