Title:
光量調節装置
Document Type and Number:
Japanese Patent JP6999477
Kind Code:
B2
Abstract:
To provide a light quantity adjusting device, in which the accuracy of blade travel is improved and a blade drive speed is speeded up.SOLUTION: The light quantity adjusting device comprises: a bottom plate having an opening; an aperture blade for adjusting the quantity of light passing through the opening; a drive ring for driving the aperture blade; a presser plate for operably holding the aperture blade and the drive ring between the bottom plate and itself; and a ring-shaped sheet member arranged between the aperture blade and the drive ring. The drive ring includes a blade presser protruding toward the aperture blade side than a surface of the sheet member facing the aperture blade on the center side of the opening than the inside diameter of the ring-shaped sheet member and supporting the aperture blade between the bottom plate and itself.SELECTED DRAWING: Figure 7
Inventors:
Kato Shou
Application Number:
JP2018068982A
Publication Date:
January 18, 2022
Filing Date:
March 30, 2018
Export Citation:
Assignee:
Canon Electronics Inc.
International Classes:
G03B9/02; G03B9/24
Domestic Patent References:
| JP20173993A | ||||
| JP2017207561A |
Attorney, Agent or Firm:
Patent Business Corporation Otsuka International Patent Office
Yasunori Otsuka
Yasuhiro Otsuka
Shiro Takayanagi
Shuji Kimura
Osamu Shimoyama
Nagakawa Yumitsu
Yasunori Otsuka
Yasuhiro Otsuka
Shiro Takayanagi
Shuji Kimura
Osamu Shimoyama
Nagakawa Yumitsu