Title:
DIAPHRAGM DEVICE, AND CAMERA PROVIDED WITH THE SAME
Document Type and Number:
Japanese Patent JP2016012029
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a diaphragm device that can improve accuracy of a diaphragm opening by eliminating backlash occurring between a connecting shaft of a diaphragm blade and a cam groove of a driving ring.SOLUTION: A driving ring 4 is rotatably disposed in a recess of a bottom plate 1, and has seven cam grooves 4a. A diaphragm blade 3 has a rotating shaft 3a rotatably attached to the bottom plate 1, and a connecting shaft 3b inserted into the cam groove 4a of the driving ring 4. Cam surfaces 4a-1, 4a-2 are provided in the cam groove 4a, which are in contact to each other with no gap at all times while sandwiching the connecting shaft 3b, thereby improving accuracy of a diaphragm opening.
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Inventors:
KAWAGUCHI HIDEYUKI
Application Number:
JP2014133341A
Publication Date:
January 21, 2016
Filing Date:
June 27, 2014
Export Citation:
Assignee:
NIDEC COPAL CORP
International Classes:
G03B9/02; G03B9/06
Domestic Patent References:
| JPH06265973A | 1994-09-22 | |||
| JP2002277713A | 2002-09-25 | |||
| JPS53125017A | 1978-11-01 | |||
| JPS5491322A | 1979-07-19 |