| 摘要 |
PURPOSE:To stop rewinding exactly and uniformly, by providing a motor speed control device for controlling a rewinding speed of a motor in accordance with an output of a film tip part detecting device. CONSTITUTION:A titled device is provided with a light emitting element 4, optical fibers 5a-5d, light emitting ends 6a-6d, photodetectors 7a-7d, an electric power source 8, a switch 9, a rear cover opening and closing interlocking circuit 10 for generating a control signal by interlocking with opening and closing of a rear cover of a camera, a latching circuit 11 for latching an output of the photodetectors 7a-7d, a film sensitivity operating circuit 1 for calculating film sensitivity by receiving an output from the latching circuit 11, and an exposure operating circuit 13. A film tip part detecting circuit 14, a motor controlling circuit 15, a winding and rewinding motor 16 and a rewinding switch 17 are also provided. The total number of information holes is counted by a counter 18 from the output of the latching circuit 11, and a counter 19 for counting the number of information holes passing through in front of the photodetector 7a, at the time of rewinding is provided. |
