| 摘要 |
The invention relates to a very precise temperature sensing function of an optical pickup in an optical reproducing/recording apparatus such as an optical disc drive with a small hardware effort. Rather than including dedicated hardware components for temperature sensing, such as PTC elements in the apparatus, a monitor diode (photodetector) employed for automatic laser power control is additionally employed as temperature sensor. Due to direct thermal coupling between laser diode and monitor diode, the operation temperature of the laser diode itself can be precisely determined. Therefore, the present invention is particularly suitable for lifetime estimation of the laser diode.
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