Title:
LIGHT-AMOUNT ADJUSTMENT DEVICE AND OPTICAL DEVICE
Document Type and Number:
Japanese Patent JP2017032632
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a light-adjustment device and optical device that enable corrections of an aperture diameter to be more simply made.SOLUTION: The present invention relates to a light-amount adjustment device 100 of a lens barrel 1, and the light-amount adjustment device thereof comprises: a plurality of first blades 112 that forms a first aperture around an optical axis OA with the blades mutually overlapped; a plurality of second blades 111 that forms a second aperture different in a diameter from the first aperture therewith; a base plate 103 that has at least one portion of the first blade 112 and at least one portion of the second blade 111 engaged; and a first cam member 104 that has at least one portion of the first blade engaged and is relatively rotatable with respect to the base plate 103. At least one portion of the base plate 103 and the first cam member 104 is relatively rotated, resulting in a change in the diameter of the first aperture.SELECTED DRAWING: Figure 3
Inventors:
IMAE ICHIRO
Application Number:
JP2015149286A
Publication Date:
February 09, 2017
Filing Date:
July 29, 2015
Export Citation:
Assignee:
NIKON CORP
International Classes:
G03B9/02
Domestic Patent References:
| JP2000250093A | 2000-09-14 | |||
| JPS56138727A | 1981-10-29 | |||
| JP2008175936A | 2008-07-31 | |||
| JPH01171428U | 1989-12-05 |
Foreign References:
| US20080260376A1 | 2008-10-23 |
Attorney, Agent or Firm:
Masao Sekiguchi
Takamasa Nakano
Takamasa Nakano