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 JP6892121
Kind Code:
B2
Abstract:
An optical diaphragm device 10 includes: a plurality of diaphragm blades 100 each including a first fixing boss 120 and a moving boss 130 which protrudes from the other surface of a first planar plate 102 toward a side in a second direction; a plurality of light leakage prevention blades 200 each having a second fixing boss 220 and forming a pair with the diaphragm blade 100; a drive ring 300 on which a plurality of first cam grooves 330 are formed; and a housing body 400 capable of housing the diaphragm blades 100, the light leakage prevention blades 200, and the drive ring 300. A second cam groove 230 is further 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. The light leakage prevention blade 200 has a light leakage prevention blade extending portion 250 which extends toward the other side from the second fixing boss 220. According to the optical diaphragm device 10, compared to a conventional optical diaphragm device, the number of diaphragm blades can be easily increased, and the overlapping order of the diaphragm blade and the light leakage prevention blade can be maintained.
Inventors:
Takafumi Hanaoka
Application Number:
JP2017244881A
Publication Date:
June 18, 2021
Filing Date:
December 21, 2017
Export Citation:
Assignee:
Nittoh corporation
International Classes:
G03B9/06
Domestic Patent References:
| JP2011215319A | ||||
| JP43026691B1 |
Attorney, Agent or Firm:
Mebuki International Patent Business Corporation
Seigo Matsuo
Seigo Matsuo