Optical pickup having a light-reception photodiode and a monitor

Details Optical pickup having a light-reception photodiode and a monitor Optical pickup having a light-reception photodiode and a monitor

1997-12-04

2000-05-09

Huber, Paul W.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369116, 369120, G11B 390, G11B 700

Patent

active

060613173

ABSTRACT:
An optical pickup that does not require adjustment of the input/output characteristic of its automatic power control circuit to keep its signal output level at a specific level is proposed. In an optical pickup comprising a light-reception photodiode for converting light reflected from a disk into a current signal, a current-to-voltage converter for converting the current signal outputted from the light-reception photodiode into a voltage signal, a monitoring photodiode for converting part of the light emitted from a semiconductor laser device into a current signal, and an automatic power control circuit for controlling the semiconductor laser device by feedback based on the current signal outputted from the monitoring photodiode, a pair of photodiodes that convert a light signal into a current signal with equal efficiency are used as the light-reception and monitoring photodiodes.

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