Title:
羽根駆動装置
Document Type and Number:
Japanese Patent JP7336941
Kind Code:
B2
Abstract:
To provide a blade drive device and imaging device that can adjust an amount of light down to a small diaphragm.SOLUTION: A blade drive device, which adjusts a size of an aperture light passes through by a plurality of blade members, comprises: an aperture formation member that forms an aperture part light passes through; a revolving member that revolves around the aperture part on one side of the aperture formation member in an optical axis direction; and a plurality of blade members that, by power of the revolving member being transmitted, get in and out of the aperture part and form a diaphragm aperture. The blade member has a cam pin that is inserted into a cam groove provided in the aperture formation member. In a process for forming a small diaphragm in the diaphragm aperture, in an area overlapping another cam groove through which the cam pin of another blade member is inserted in the optical axis direction, a tip part of a part traversing the other cam groove in the blade member moves while overlapping the other blade member in the optical axis direction.SELECTED DRAWING: Figure 8
Inventors:
Yoshiyuki Koyama
Application Number:
JP2019179616A
Publication Date:
September 01, 2023
Filing Date:
September 30, 2019
Export Citation:
Assignee:
Canon Electronics Inc.
International Classes:
G03B9/06; G03B9/26
Domestic Patent References:
| JP2014206768A | ||||
| JP2017207561A | ||||
| JP2012108380A | ||||
| JP2001174861A |
Attorney, Agent or Firm:
Patent Attorney Corporation Otsuka International Patent Office