| 摘要 |
PURPOSE:To stably perform a reproducing operation extending over a long period by providing a high frequency oscillation circuit to generate one high frequency signal, and a distributor having plural output terminals to distribute output to plural output setting one high frequency signal as an input signal and to connect the output terminal to an individual selected by plural semiconductor laser elements, respectively. CONSTITUTION:One high frequency oscillation circuit 4 and one distributor 5 to transmit the input signal to the output terminal of same number as that of selected semiconductor laser elements 2a-2n are provided. And the output of the high frequency oscillation circuit 4 is inputted to the distributor, and one output terminal of the distributor is connected to one of the selected semiconductor laser elements 2a-2n individually, respectively, and a system is constituted so as to superimpose and apply the high frequency signal of same frequency on all selected semiconductor laser elements 2a-2n. In such a manner, since no unrequired beat signal to be mixed in a reproduced signal area occurs, a reproduced signal with high quality can be maintained extending over the long period. |
