当记录活动图像并且发出记录静止图像的指令时，成像设备允许取景器立即显示快门帘幕(shutter curtain)的图像。此外，为了预览，成像设备在指定时间段内在取景器上显示所记录的静止图像。
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electronic first shutter curtain 电子优先快门帘
curtain shutter 帘幕式快门 ; 焦面快门 ; 帘式快门
Trsuffering-shutter curtain 后帘同步
shutter r curtain 快门帘幕
trailing-shutter r curtain 后帘同步
curtain-type shutter 帘幕式快门
When the shutter has been set for a very short exposure period, such as 1/200th sec or faster, the twin curtain system comes into its own.
当快门被设置为高速曝光，像1/200秒或更快时，两部分幕帘系统就相互配合完成。
After a period determined by the set shutter speed, the rear curtain now drops to close the camera to light and end the exposure.
度过由快门速度设置的曝光时间后，后幕帘落下闭合，曝光停止。
Tubular motors are used to drive shutter mechanisms and curtain machines, which are convenient in the daily life.
管状电机是卷帘机和窗帘机的驱动设备。在日常生活中的应用日益增多。
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