| 摘要 |
PURPOSE:To report the film loading miss surely with alarm, by generating an alarm on a basis of the unoperated state of a perforation detecting switch and the operated state of a shutter charge detecting switch when the film is advanced. CONSTITUTION:When a shutter release switch SW2 is interlocked with the shutter release to turn on, a frequency dividing circuit DVD is reset. Meanwhile, when shutter charging is performed in accordance with the shutter release, a shutter charge detecting switch SW4 is turned off, and an FF1 is reset for a constant time through an inverter IN1 and a monostable multivibrator MSM2. In this case, if the film loading is defective and the film cannot be advanced, a perforation detecting switch SW3 is not turned on and off, and the output is not generated from the circuit DVD, and the output of the FF1 is high-level still and is not inverted. Thus, an oscillating circuit VIV is operated for a constant time through a monostable multivibrator MSM3, and the film loading miss is reported surely with alarm by a buzzer BU. |
