Title:
APERTURE DEVICE AND OPTICAL INSTRUMENT
Document Type and Number:
WIPO Patent Application WO/2012/093511
Kind Code:
A1
Abstract:
An aperture device comprises the following: a base plate having an opening; a step motor that can stop at specific rotation angles; an output member that has first and second pins and that rotates in a specific range due to the action of the step motor; first and second blades that are connected respectively to the first and second pins, are driven by the output member, and move in a straight line in mutually opposite directions, thereby overlapping the opening and adjusting the area thereof. When a virtual line segment that passes through the rotation center of the output member and extends in the movement direction of the blades is the X-axis, the angle between the x-axis and the directional line segment that connects the rotation center when the area of the opening is smallest and the first pin, is -20° to +30°.
Inventors:
KAWAMOTO HISASHI (JP)
Application Number:
PCT/JP2011/071645
Publication Date:
July 12, 2012
Filing Date:
September 22, 2011
Export Citation:
Assignee:
SEIKO PRECISION KK (JP)
KAWAMOTO HISASHI (JP)
KAWAMOTO HISASHI (JP)
International Classes:
G03B9/02
Foreign References:
| JP2010078754A | 2010-04-08 | |||
| JPH0520020U | 1993-03-12 | |||
| JPH11194382A | 1999-07-21 |
Attorney, Agent or Firm:
KATAYAMA, SHUHEI (JP)
Shuhei Katayama (JP)
Shuhei Katayama (JP)
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Claims: