| 摘要 |
PURPOSE:To protect surely an optical system and each member of device main body supplying each sensing signal of a couple of detection sensors to a solenoid drive circuit as a forced control signal and stopping forcibly the optical system of the drive source reciprocated at program runaway. CONSTITUTION:A detection signal of sensors 31, 32 is fetched normally by a CPU, a drive signal or a drive release signal is generated and fed to circuits 102, 103 to drive a solenoid 41 or 42. A detection signal is given to control transistors(TRs) Q1, Q2, since the signal is the same as the drive signal or drive release signal formed by the CPU, the TRs Q1, Q2 are neglected at normal operation. The detection signal is supplied directly to the control elements Q1, Q2 at control program runaway of the CPU, the sensor 31 senses the arrival of the optical system and when the signal is inputted to the CPU, the same detection signal is fed also to the TR Q2 to turn on the TR Q1, a driver 105 is operated to interrupt power application of the solenoid 42 thereby stopping the return of the optical system and preventing collision due to runaway.
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