Patent ID: 8550730
Filing Date: 2013-10-08
Classification: G03B

Abstract:
1. A focal plane shutter for cameras comprising a support plate which has a missing portion and is placed while a plate plane of the support plate is parallel to a shutter base plate, a driving member which is rotatably fitted to a shaft erectly provided on the shutter base plate, between the shutter base plate and the support plate, and which is rotated by biasing force of a driving spring from its shooting-operation-starting position in shooting to run a shutter blade, an electromagnet which includes a coil wounded around a bobbin, the both ends of the coil being wound around two terminal pins that are provided for the bobbin and are inserted into the missing portion, respectively, and an iron core member magnetized by electrifying the coil, which is fitted on the support plate with the electromagnet between the shutter base plate and the support plate, and which attracts and holds the driving member by magnetization of the iron core member in shooting and then releases the driving member to make it possible to rotate the driving member from its shooting-operation-starting position by demagnetization of the iron core member after a predetermined lapse of time, and a printed wiring board which is placed in the missing portion and is soldered to the both ends of the coil.