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Title:
LIGHT AMOUNT ADJUSTMENT DEVICE AND OPTICAL DEVICE
Document Type and Number:
Japanese Patent JP2014119609
Kind Code:
A
Abstract:

To provide a structure suitable for miniaturization of a light amount adjustment device with a simple structure.

The light amount adjustment device has: a light amount adjustment part 3; and a blade driving member 2 that is rotatably held by a blade support part 1e of a base member 1, held rotatably in a circumferential direction of a light passage aperture by the base member 1 and rotates a light amount adjustment blade via a blade engagement part 2e. The blade driving member 2 is assembled to the base member 1 so that the blade engagement part 2e is arranged closer onto a stationary aperture 1a side than the blade support part 1e of the base member 1 from an opposite direction to a direction having a light amount adjustment blade 3 assembled to the base member 1 of an optical axis direction. A light amount adjustment blade 3 has a shape that has the light amount adjustment part 3 located away on one side of an optical axis direction with respect to a supported part so that a recessed space is formed closer onto the stationary aperture 1a side than the blade engagement part 2e. The base member 1 and the blade driving member 2 are arranged closer onto the recessed space than the light amount blade 3.


Inventors:
KOZU SATOSHI
Application Number:
JP2012274970A
Publication Date:
June 30, 2014
Filing Date:
December 17, 2012
Export Citation:
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Assignee:
CANON DENSHI KK
International Classes:
G03B9/02; G03B9/06
Domestic Patent References:
JP2007500869A2007-01-18
JP2002051524A2002-02-15
JP2004048874A2004-02-12
JP2010281970A2010-12-16
JP2012053492A2012-03-15
JP2007500869A2007-01-18
Attorney, Agent or Firm:
Ryosuke Fujimoto
Atsushi Mizumoto