| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical disk drive capable of accurately detecting the dirt on a lens of an optical pickup and the deterioration of a laser diode. <P>SOLUTION: At the time of shipping the optical disk drive, the power Qo of a transmitted light through an objective lens 22 when the laser diode 21 is emitted by light emitting power Po and a current Io of the laser diode 21 are stored as respective initial values. In the case of performing a test after shipment, the laser diode 21 is emitted by the same light emitting power as that of shipment and the power Qt of transmitted light through the objective lens 22 and the current It of the laser diode 21 are measured. The measured value Qt is compared with the initial value Qo, and when a difference between both values It, Io exceeds a fixed value, the dirt of the objective lens 22 is judged. The measured value It is compared with the initial value Io, and when a difference between both the values It, Io exceeds a fixed value, the deterioration of the laser diode 21 is judged. <P>COPYRIGHT: (C)2004,JPO |
