Title:
光量調節装置
Document Type and Number:
Japanese Patent JP5847438
Kind Code:
B2
Abstract:
A light amount adjustment device capable of adjusting the amount of light at high speed and with accuracy. When a rotary plate is rotatively driven by a motor, diaphragm blades disposed between the rotary plate and a cam plate are rotatively driven by the rotary plate in a plane perpendicular to an optical axis. When a coil disposed on the cam plate through a back yoke is energized and a magnetic field is generated around the coil, a magnetic attracting force is applied to the rotary plate rotating under the magnetic field, whereby the rotary plate is displaced toward the back yoke and frictions between the diaphragm blades and the rotary plate, etc. increase, so that rotations of the diaphragm blades are decelerated.
Inventors:
Junichi Saito
Application Number:
JP2011119161A
Publication Date:
January 20, 2016
Filing Date:
May 27, 2011
Export Citation:
Assignee:
Canon Inc
International Classes:
G03B9/02; G03B9/06
Domestic Patent References:
JP49058341U | ||||
JP58159524A | ||||
JP49014143U | ||||
JP57184915U | ||||
JP53082325A | ||||
JP10138596A | ||||
JP2007159061A | ||||
JP63084125U |
Foreign References:
WO2010041501A1 | ||||
US20110150458 |
Attorney, Agent or Firm:
Another role Shigehisa
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