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Title:
FOCAL PLANE SHUTTER AND CAMERA
Document Type and Number:
Japanese Patent JP2015105989
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To increase resolution of a detection object member detected by an optical sensor while achieving simplification, miniaturization, and so on of a structure in a focal plane shutter.SOLUTION: A focal plane shutter includes a plate 10 with an aperture for exposure, a blade member 40 freely movably provided on the plate so as to open/close the aperture, a driving member 60 for driving the blade member, a detection object plate 80 moved according to the blade member, and an optical sensor 90 disposed so as to face the detection object plate. The detection object plate 80 includes; a plurality of slits 83a and 84a formed to open radially at intervals of a prescribed angle; and light-transmissive plate parts 83b and 84b which are disposed in each of the plurality of slits so as to equally divide the slit in a circumferential direction and have prescribed light transmissivities. Thus the resolution of the detection object plate detected by the optical sensor can be increased while simplification, miniaturization, and so on of a structure are achieved.

Inventors:
SUZUKI YUSUKE
Application Number:
JP2013247032A
Publication Date:
June 08, 2015
Filing Date:
November 29, 2013
Export Citation:
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Assignee:
NIDEC COPAL CORP
International Classes:
G03B9/36
Domestic Patent References:
JP2007240783A2007-09-20
JPH04346029A1992-12-01
JP2004028724A2004-01-29
JP2004069427A2004-03-04
Attorney, Agent or Firm:
Takatoshi Yamamoto