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    • 62. 发明授权
    • Electromagnetically operated shutter mechanism
    • 电磁式快门机构
    • US4121235A
    • 1978-10-17
    • US725201
    • 1976-09-22
    • Susumu FujitaSeijiro KushibeHiroshi Shimizu
    • Susumu FujitaSeijiro KushibeHiroshi Shimizu
    • G03B9/40G03B9/08
    • G03B9/40
    • An electromagnetically operated shutter mechanism comprising first and second shutter members supported for movement in the opposite directions to each other for selectively closing and opening an exposure aperture. Permanent magnets are respectively mounted on the first and second shutter members. Cooperative with these permanent magnets are first and second solenoid coils for driving at least either one of the first and second shutter members accompanying corresponding movement of the other of the first and second shutter members. For energizing the solenoid coils, some electric drive circuits including push-pull amplifiers are also disclosed.
    • 一种电磁操作的快门机构,包括第一和第二快门部件,该第一和第二快门部件被支撑为在彼此相反的方向上移动以选择性地关闭和打开曝光孔。 永磁体分别安装在第一和第二挡板部件上。 与这些永磁体合作的是第一和第二电磁线圈,用于驱动第一和第二活门构件中的至少一个伴随第一和第二活门构件中另一个的相应运动。 为了激励螺线管线圈,还公开了包括推挽放大器的一些电驱动电路。