| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical disk and a light receiving IC that can reduce influence of an asynchronous noise component with respect to a high-frequency signal. <P>SOLUTION: A first light receiving circuit 31 in the light receiving IC 30 which constitutes an optical disk apparatus 1 generates a voltage signal 102 showing an amount of light of a laser light L1 oscillated in a multimode. A second light receiving circuit 32 generates a voltage signal 101 showing an amount of light of a return light L2 from the optical disk 2. A binarization circuit 33 extracts and binarizes a band component of predetermined frequency in the voltage signal 102 and obtains a digital signal 103. A delay element 34 delays a phase of the digital signal 103 by a time corresponding to a phase difference between the voltage signals 101 and 102 and outputs the result as a timing signal 104. A sample/hold circuit (S/H) 35 samples and holds the voltage signal 101 in synchronization with the timing signal 104. An LPF 36 removes the band component of the frequency from an output signal 105 of the S/H 35. <P>COPYRIGHT: (C)2010,JPO&INPIT |
