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Title:
DIAPHRAGM DEVICE AND LENS BARREL
Document Type and Number:
WIPO Patent Application WO/2019/124028
Kind Code:
A1
Abstract:
[Problem] To provide a diaphragm device in which downsizing is possible in the radial direction, even though the diameter of an aperture stop can still be set accurately. [Solution] This diaphragm device is provided with: an annular bottom plate 12a in which an aperture M for an optical path is formed; a plurality of diaphragm blades 13 that are rotatably attached to the bottom plate 12a; a blade rotation member for rotating the diaphragm blades 13 with respect to the bottom plate 12a; and a biasing member 16 that biases, with respect to the bottom plate 12a, each of the plurality of diaphragm blades 13 toward one side of the rotation direction of the diaphragm blade 13. In the blade rotation member, a cam groove 14a is formed for changing the diameter of an aperture stop by rotating the diaphragm blades 13 with respect to the bottom plate 12a. To each of the diaphragm blades 13, a cam projection 19 engaged with the cam groove 14a is fixed. To the diaphragm blade 13, a biasing projection 20 which is erected from the surface of the diaphragm blade 13 and with which the biasing member 16 is engaged is fixed. The cam projection 19 is in contact with a side surface of the cam groove 14a by a biasing force of the biasing member 16.

Inventors:
ENDO JUNICHI (JP)
Application Number:
PCT/JP2018/044342
Publication Date:
June 27, 2019
Filing Date:
December 03, 2018
Export Citation:
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Assignee:
NITTOH INC (JP)
International Classes:
G03B9/06; G02B7/02; G03B9/02
Foreign References:
JP2015079200A2015-04-23
JP2012168237A2012-09-06
JP2015222392A2015-12-10
Other References:
See also references of EP 3731013A4
Attorney, Agent or Firm:
KODAIRA Shin (JP)
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