Title:
LIGHT AMOUNT ADJUSTMENT DEVICE AND IMAGING DEVICE
Document Type and Number:
Japanese Patent JP2014228559
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To cause a stable drive of a plurality of light amount adjustment blades, and to enable a formation of an excellent shape of a light passing opening.SOLUTION: A light amount adjustment device comprises: a base member 1 that has an opening part 1a serving as an optical path provided; and a plurality of light amount adjustment blades provided rotatably from a periphery of the opening part 1a of the base member 1 toward an inward of the opening part thereof and adjusting an amount of light passing through the opening part 1a. When the plurality of light amount adjustment blades 4 are positioned at the periphery of the opening part 1a, the plurality of light amount adjustment blades advances at a plurality of portions including a blade tip part 4e from an overlapped state in an optical axis direction toward the inward of the opening part, and thereby the plurality of light amount adjustment blades 4 enables the opening part 1a to be stopped down in a state where the tip part 4e is prevented from warping toward the optical axis direction.
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Inventors:
YAJIMA SATORU
Application Number:
JP2013105387A
Publication Date:
December 08, 2014
Filing Date:
May 17, 2013
Export Citation:
Assignee:
CANON DENSHI KK
International Classes:
G03B9/06
Domestic Patent References:
| JP2006337948A | 2006-12-14 | |||
| JP2011039178A | 2011-02-24 | |||
| JP2007264645A | 2007-10-11 | |||
| JPH06308569A | 1994-11-04 | |||
| JPS61256333A | 1986-11-13 | |||
| JP2002014388A | 2002-01-18 | |||
| JP2011107584A | 2011-06-02 | |||
| JPH1138467A | 1999-02-12 |
Foreign References:
| US4257086A | 1981-03-17 |
Attorney, Agent or Firm:
Ryosuke Fujimoto
Atsuya Mizumoto
Atsuya Mizumoto