Title:
FOCAL PLANE SHUTTER AND CAMERA
Document Type and Number:
Japanese Patent JP2015143773
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To reduce or suppress effects of reactive force and the like affected when generating drive force of a drive spring (torsion coil spring) in focal plane shutters.SOLUTION: A focal plane shutter comprises: blade members 30 and 40 that are reciprocatively provided to a base plate to open/close an aperture 10a and are urged in an inverse direction with respect to a shutter action; drive members 50 and 60 that are coupled and rotatably supported to the blade members; and drive springs 70 and 80 and the like that urge the drive members in a direction where the blade members are caused to perform the shutter action. The drive springs 70 and 80 are a torsion coil spring that includes coils 70a and 80a arranged around an axial line, stationarily locked lips 71 and 81, and movable lips 72 and 82 unlockably locked to the drive members. The stationary lips 71 and 81 are locked at a location where a tangential direction is directed at a direction approximately perpendicular to a reciprocating direction of the blade members in the coils. Accordingly, effects affected by reactive force and the like when the drive springs generate drive force can be reduced.
Inventors:
TANAKA HIROKAZU
Application Number:
JP2014017131A
Publication Date:
August 06, 2015
Filing Date:
January 31, 2014
Export Citation:
Assignee:
NIDEC COPAL CORP
International Classes:
G03B9/36
Domestic Patent References:
| JP2012177765A | 2012-09-13 | |||
| JP2009122206A | 2009-06-04 | |||
| JP2012177765A | 2012-09-13 | |||
| JP2009122206A | 2009-06-04 | |||
| JP2008164804A | 2008-07-17 | |||
| JPH09304808A | 1997-11-28 | |||
| JP2008164804A | 2008-07-17 | |||
| JPH09304808A | 1997-11-28 |
Attorney, Agent or Firm:
Takatoshi Yamamoto