| 摘要 |
PURPOSE:To display the remaining number of frames where photographing is possible, by winding up the whole film around a wind up reel before photographing and by feeding the film into a case at every photographing. CONSTITUTION:As switch 5 is short-circuited with loaded film 2, motor 12 is driven to wind up the whole film around reel 3 in the direction shown by arrow I. At this time, the signal which nearly corresponds to the number of wound up frames by light emitting element 7, photodetector 8 and slit plate 9 is counted by counter 11 and the number of frames is displayed on display part 13. On one-frame photographing, motor 14 is driven to rewind the film in the direction shown by arrow II. At this time, the number of perforations 15 of the film is detected by switch 17 through the rotation of sprockets 16 and once the film is fed by just one frame, motor 14 is stopped and the display value on display part 13 is decreased by one through counter 11. |
