Title:
BLADE DRIVE DEVICE AND OPTICAL DEVICE
Document Type and Number:
WIPO Patent Application WO/2012/120735
Kind Code:
A1
Abstract:
The rotational angle range of a rotor according to the present invention is limited to an operating angle range which is smaller than a total rotational angle range of the rotor, in which the rotor can be rotated with an excited stator. When the rotor is positioned at a first end of the operating angle range, a blade is overlapped with an opening and when the rotor is positioned at a second end of the operating angle range, the blade is away from the opening. The operating angle range includes a position in the total rotational angle range, at which the torque value of the rotor becomes the maximum value in the case that the rotor rotates in the first direction when the rotational angle range of the rotor is not limited. A biasing member biases the rotor in the second direction directly or indirectly in a section at least from a halfway position to the first end in the operating angle range.
Inventors:
YASUDA AKIRA (JP)
ITO AKIHIRO (JP)
YAMAMOTO MASAMI (JP)
ITO AKIHIRO (JP)
YAMAMOTO MASAMI (JP)
Application Number:
PCT/JP2011/077144
Publication Date:
September 13, 2012
Filing Date:
November 25, 2011
Export Citation:
Assignee:
SEIKO PRECISION KK (JP)
YASUDA AKIRA (JP)
ITO AKIHIRO (JP)
YAMAMOTO MASAMI (JP)
YASUDA AKIRA (JP)
ITO AKIHIRO (JP)
YAMAMOTO MASAMI (JP)
International Classes:
G03B9/36
Foreign References:
| JP2001174867A | 2001-06-29 | |||
| JP2002116478A | 2002-04-19 |
Attorney, Agent or Firm:
KATAYAMA, SHUHEI (JP)
Shuhei Katayama (JP)
Shuhei Katayama (JP)
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Claims: