发明授权
US5359376A Camera and film winding-up apparatus for camera 失效
照相机和胶卷清洗设备

Camera and film winding-up apparatus for camera
摘要:
An apparatus for winding up film in a camera has a direct current brush motor and an arrangement for producing a pulse train of pulses in response to the production of brush noise by said motor as it rotates. A control circuit is responsive to the pulse train of pulses to control the advancing and rewinding of the film as well as to detect the winding ends and to detect the occurrence of film loading errors.
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