Title:
LIGHT-AMOUNT ADJUSTMENT DEVICE
Document Type and Number:
Japanese Patent JP2017120347
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a light-amount adjustment device that slides a plurality of diaphragm blades between an open side of an optical path aperture and a minimum diaphragm side thereof by a fixed loading torque, and thereby can smoothly and accurately perform a series of diaphragm operations.SOLUTION: In a light-amount adjustment device comprising: a ring-shape base member 18 having an optical path aperture at a center part; an opening/closing guide plate 14 provided so as to oppose the base member 18; and a plurality of diaphragm blades 15 sliding in a circumferential direction as mutually overlapping in a sliding space S to be provided between the base member 18 and the opening/closing guide plate 14, and opening/closing the optical path aperture, interval change means, which is composed of a cam surface 33 and cam reception part 34, is provided that changes an interval of the sliding space S between the base member 18 and the opening/closing guide plate 14 in conjunction with the sliding of the plurality of diaphragm blades 15.SELECTED DRAWING: Figure 7
Inventors:
FUKAZAWA RYOZO
AMINO KEIJIRO
MASUYAMA KENJI
AMINO KEIJIRO
MASUYAMA KENJI
Application Number:
JP2015257626A
Publication Date:
July 06, 2017
Filing Date:
December 29, 2015
Export Citation:
Assignee:
NISCA CORP
International Classes:
G03B9/06
Attorney, Agent or Firm:
Satoshi Asakawa
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