Title:
Light volume control device
Document Type and Number:
Japanese Patent JP5947550
Kind Code:
B2
Abstract:
An arm member is capable of moving to a first position, a second position, a third position, and a fourth position, in order, by driving a stepping motor in one direction. A shutter blade is in a closed state and a light quantity adjustment blade is in an insertion state when the arm member is at the first position, the shutter blade is in an open state and the light quantity adjustment blade is in the insertion state when the arm member is at the second position, the shutter blade is in the open state and the light quantity adjustment blade is in the evacuation state when the arm member is at the third position, and the shutter blade is in the closed state and the light quantity adjustment blade is in the evacuation state when the arm member is at the fourth position.
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Inventors:
Yoshitaka Hashimoto
Application Number:
JP2012009668A
Publication Date:
July 06, 2016
Filing Date:
January 20, 2012
Export Citation:
Assignee:
Canon Inc
International Classes:
G03B9/14; G03B9/10
Domestic Patent References:
| JP2007212645A | ||||
| JP2005354875A | ||||
| JP59010934A | ||||
| JP2003274629A | ||||
| JP2001117135A | ||||
| JP9054354A | ||||
| JP2005077760A |
Attorney, Agent or Firm:
Ryosuke Fujimoto
Atsushi Mizumoto
Hirayama Tomoya
Atsushi Mizumoto
Hirayama Tomoya
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