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Patent Searching and Data


Title:
AMOUNT OF LIGHT ADJUSTMENT DEVICE AND OPTICAL APPARATUS
Document Type and Number:
Japanese Patent JP2017026834
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To improve durability of a light shielding blade without deteriorating acceleration of shutter speed.SOLUTION: An amount of light adjustment device includes: one or more sheets of an amount of light adjustment member whose driving source is a rotatable rotor magnet and that can advance or retreat relative to a light passage opening while rotating in response to rotation of the rotor magnet; a transmission member for transmitting rotation of the rotor magnet to the amount of light adjustment member; and an apparatus base for supporting a driving unit. An angle defined by the rotation direction of a drive pin provided with the transmission member and the operation direction of a cum provided with the amount of light adjustment member significantly changes and rotation speed of the amount of light adjustment member is changed by the rotational position of the rotor magnet.SELECTED DRAWING: Figure 6

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Inventors:
KAWAKUBO NAOKI
Application Number:
JP2015145614A
Publication Date:
February 02, 2017
Filing Date:
July 23, 2015
Export Citation:
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Assignee:
CANON DENSHI KK
International Classes:
G03B9/10; G03B9/02