| 摘要 |
PURPOSE:To execute the suppression to the lowest power at a home position by switching respectively a laser light power source part with the home position of an information recording medium, the recording part of information and a control signal due to the position detection and mode detection of the reproduction by a command from a CPU. CONSTITUTION:Both a mode switch SM and a switch SR for adjusting a power respond to a signal from a CPU to issue a command based on the signal of a position detector provided at a reader writer corresponding to respective control of the driving part of the reader writer, a home position in the moving direction of an information recording medium, a track No. part and a data part and contacts KL, KS and K1, K2 are switched. Consequently, when a head to emit the laser light is returned to the home position of a card by the com mand from the CPU first, the CPU to receive the output signal of a position detector issues a switching command to the contact K2 so as to make minimum the output of a power source part to a switch for adjusting a power regardless of the recording and reproducing. Thus, while a light beam is radiated to the home position, it is suppressed to the minimum energy.
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