| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an I/V conversion circuit, an optical head and a recording/ reproducing device, by which the level of the detection signal outputted from the IV conversion circuit is optimized without being affected by noise at both of recording and reproducing time. <P>SOLUTION: The IV conversion circuit 20 is constituted by furnishing eight amplification means 22A to 22H and one adding amplification means 24. When a feedback resistor 2204 is selected by a switch means 2208, an amplification factor of the amplification means 22A becomes a factor Aw for the recording time, and when a feedback resistor 2206 is selected, the amplification factor of the amplification means 22A becomes higher amplification factor Ar for the reproducing time. When the feedback resistor 2404 is selected by the switch means 2408, an amplification factor of the adding amplification means 24 becomes the amplification factor Asw for the recording time, and when the feedback resistor 2406 is selected, the amplification factor of the amplification means 24 becomes the higher amplification factor Asr for the reproducing time. <P>COPYRIGHT: (C)2004,JPO |
