Title:
LIGHT-AMOUNT ADJUSTMENT DEVICE AND CAMERA INCLUDING THE SAME
Document Type and Number:
Japanese Patent JP2016142766
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide an aperture device that increases the accuracy of an aperture diameter by eliminating looseness between an aperture blade and a drive ring.SOLUTION: There are provided a plurality of aperture blades 5 caused to be operative in the same direction in cooperation with a drive ring 4 rotatably arranged on a base plate 1. Each aperture blade 5 is urged in one direction by a spring 6 at any time, and engages with one of a plurality of engaged units 4c formed in a cam groove 4b of the drive ring 4. Accordingly, looseness between the drive ring 4 and the aperture blade 5 can be eliminated, and a prescribed aperture diameter can be maintained, which in turn accuracy of the aperture diameter can be increased and maintained.SELECTED DRAWING: Figure 2
Inventors:
KOJIMA TETSUYA
Application Number:
JP2015016119A
Publication Date:
August 08, 2016
Filing Date:
January 29, 2015
Export Citation:
Assignee:
NIDEC COPAL CORP
International Classes:
G03B9/06