| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical pickup in which laser power of a laser beam projected to an optical disk can be kept constant. <P>SOLUTION: In the optical pickup provided with first and second LD 51, 52 projecting a plurality of laser beams having different wavelengths, an optical axis composing prism 53 composing a plurality of optical axes of the laser beams projected from the first and the second LD 51, 52, a leakage mirror 54 reflecting the laser beam on the composed optical axis composed by this optical axis composing prism 53 to a direction of an optical disk 56, and a LD monitor 56 detecting light quantity of the laser beam projected to the optical disk 56, a film unformed region 12 in which a reflecting film 11 is not formed is provided at a part of the leakage mirror 54, light quantity of the laser beam transmitting this film unformed region 12 is detected by the LD monitor 55. <P>COPYRIGHT: (C)2007,JPO&INPIT |
