| 摘要 |
PURPOSE:To enable the photographer to know in which part of a film is wound, by providing a display circuit for film winding and changing and displaying the mode of display at every prescribed time from the start of winding. CONSTITUTION:A timer T3 for displaying operates for one second since the supply of an electric power source so that a light emitting diode ED lights and a sounding body P produces 2kHz sound with an oscillator 20. Since the time required for feeding one frame is within one second, only the displaying with said continuous oscillating sound is accomplished, and the feeding of one frame is known to the user when the power source is turned off and the display ends. The leader part and terminal end of the film are detected in about two seconds after the winding is started, and the electric power source is turned off upon the detection thereof; therefore, the emission of light and the production of the sound are made for about one second at 10Hz intermission intervals after the above-described continuous light emission and sounding for about one second, from which the user is able to know that the leader part and terminal end of the film are under winding. |
