Title:
FOCAL-PLANE SHUTTER
Document Type and Number:
Japanese Patent JP3801728
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a strong focal-plane shutter for a camera having simple constitution and capable of detecting the abnormal operation of a rear blade driving member.
SOLUTION: A front blade driving member 8 has the operation pin 8e of a front blade group. A rear blade operating member 11 pressed and operated by the rear blade driving member 12 has the operation pin 11c of a rear blade group. The respective driving members 8 and 12 are held at exposure operation starting positions against their driving springs by the magnetic force of their electromagnets. A mediate member 15 is energized counterclockwise. When the holding power of the member 12 by the electromagnet is not obtained, the member 12 rotates, its projecting part 12d presses the bent part 15a of the member 15, and d bent part 15d presses the member 8. The member 8 is separated from the electromagnet and travels by the force of two driving springs, then a switch is operated by a pressing pin 8c so as to give the warning of the abnormal operation.
Inventors:
Kiyota Masato
Application Number:
JP12735097A
Publication Date:
July 26, 2006
Filing Date:
May 16, 1997
Export Citation:
Assignee:
Nidec Copal Corporation
International Classes:
G03B9/36; (IPC1-7): G03B9/36
Domestic Patent References:
| JP8304876A | ||||
| JP57017935A | ||||
| JP2090833U |
Attorney, Agent or Firm:
Yasushi Shinohara