Title:
BLADE DRIVING DEVICE AND OPTICAL DEVICE
Document Type and Number:
Japanese Patent JP2017058680
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a small-sized blade driving device which forms a circular light passage aperture from an open state to a small aperture diameter, and to provide an optical device.SOLUTION: The blade driving device comprises a plurality of aperture blade groups which are advanced into and retracted from a light passage aperture allowing light to pass therethrough, to form a plurality of stop apertures different in diameter, and driving means for driving the aperture blade groups, and is characterized in that peaks of load received by the driving means due to respective aperture blade groups are dispersed in a process of advancing respective aperture blade groups into the light passage aperture to successively form the plurality of stop apertures.SELECTED DRAWING: Figure 1
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Inventors:
SHIBATA MITSUO
YOSHIZAWA TAKAHITO
YOSHIZAWA TAKAHITO
Application Number:
JP2016181467A
Publication Date:
March 23, 2017
Filing Date:
September 16, 2016
Export Citation:
Assignee:
CANON DENSHI KK
International Classes:
G03B9/02; G03B9/06
Domestic Patent References:
| JP2014206768A | 2014-10-30 | |||
| JP2013029693A | 2013-02-07 | |||
| JP2002090798A | 2002-03-27 | |||
| JP2002090978A | 2002-03-27 |
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