Title:
絞り装置、レンズ鏡筒及び撮像装置又は投影装置
Document Type and Number:
Japanese Patent JP6857917
Kind Code:
B2
Abstract:
Provided is an optical diaphragm device 10 which includes: a plurality of diaphragm blades 100 each including: a first fixing boss 120 which protrudes from one surface of a first planar plate 102 toward a side in a first direction; and a moving boss 130 which protrudes from the other surface of the first planar plate 102 toward a side in a second direction; a plurality of light leakage prevention blades 200 each including a second fixing boss 220 which protrudes from one surface of a second planar plate 202 toward the side in the first direction, the light leakage prevention blade 200 forming a pair with the diaphragm blade 100; a drive ring 300 in which a plurality of first cam grooves 330 are formed; a housing body 400 capable of accommodating the diaphragm blades 100, the light leakage prevention blades 200, and the drive ring 300, wherein a second cam groove 230 is formed in the light leakage prevention blade 200, the moving boss 130 of the diaphragm blade 100 is inserted into the second cam groove 230 of the light leakage prevention blade 200, and is inserted into the first cam groove 330 of the drive ring 300, and a position where the first fixing boss 120 is disposed and a position where the second fixing boss 220 is disposed differ from each other in distance from the optical axis OA. According to the optical diaphragm device of the present invention, it is possible to provide the optical diaphragm device where the number of diaphragm blades can be easily increased.
Inventors:
Takafumi Hanaoka
Application Number:
JP2018554917A
Publication Date:
April 14, 2021
Filing Date:
November 22, 2017
Export Citation:
Assignee:
Nittoh corporation
International Classes:
G03B9/06; G03B9/02
Domestic Patent References:
| JP2011215319A | ||||
| JP2006154312A | ||||
| JP2016133626A | ||||
| JP4326691A |
Attorney, Agent or Firm:
Mebuki International Patent Business Corporation
Seigo Matsuo
Seigo Matsuo