| 摘要 |
PROBLEM TO BE SOLVED: To simplify the circuit constitution which is formed for lowering the noise caused by a turn-back light from a recording medium. SOLUTION: When the information recorded on an optical disk 6 is reproduced by a controller 10, etc., a signal with the frequency higher than the channel clock period based on the specific recording modulation system is generated, and a driving current for reproduction, to which the high frequency component is added by superposing the high frequency signal to the driving DC current of an LD light source 2, is produced. When the information is recorded on the optical disk 6, the recording operation is executed in such a manner that a light emitting pulse according to the specific light emitting regulation is formed by using the channel clock period and the high frequency signal generated like the above mentioned manner. |
