Title:
LIGHT-AMOUNT ADJUSTMENT DEVICE
Document Type and Number:
Japanese Patent JP2016157035
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a light-amount adjustment device that allows a size of an aperture blade to be small, allows a length of a drive arm to be small, and is not enlarged as an entire diaphragm device.SOLUTION: A light-amount adjustment device includes: an aperture blade with a short drive stroke; an aperture blade with a long drive stroke; and a drive arm that causes the aperture blades to be reciprocally operative. The aperture blade with the short drive stroke is configured to engage with a drive pin part provided on the drive arm, and be driven from an opening position to a closed position, and the aperture blade with the long drive stroke is configured to be driven from the opening position to the closed position in conjunction with an operation of a link member driving the aperture blade with the short drive stroke with the amount of movement of the aperture blade therewith enlarged.SELECTED DRAWING: Figure 1
Inventors:
IWASAKI YOICHI
NOGUCHI KAZUHIRO
NOGUCHI KAZUHIRO
Application Number:
JP2015035982A
Publication Date:
September 01, 2016
Filing Date:
February 26, 2015
Export Citation:
Assignee:
CANON KK
International Classes:
G03B9/02; G03B9/18; G03B9/24
Attorney, Agent or Firm:
Yukio Takanashi
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