Optical pick-up head unit and information record and playback eq

Details Optical pick-up head unit and information record and playback eq Optical pick-up head unit and information record and playback eq

1999-12-06

2000-11-28

Edun, Muhammad

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

36912401, 36912412, G11B 700

Patent

active

061544264

ABSTRACT:
The present invention provides an optical pick-up head unit comprising a light source to radiate a beam, a focusing optical system to converge the beam on an optical recording medium, and a photodetector to output an electric signal corresponding to the quantity of received light. The photodetector includes a plurality of receiving parts and a plurality of I-V converting parts that receive respectively current signals outputted from the receiving parts and convert the current signals into voltage signals. First I-V receiving parts output signals that change in the positive direction when light enters the receiving parts while second I-V converting parts output signals that change in the negative direction when light enters the receiving parts. The receiving parts are respectively connected to any one of the first I-V converting parts or the second I-V converting parts. As a result, the optical pick-up head unit is less influenced by extraneous noise even at a high-speed reproduction, and it can reproduce information recorded on a medium with high reliability. The present invention also provides information record and playback equipment using the optical pick-up head unit.

REFERENCES:
patent: 4369367 (1983-01-01), Horikawa
patent: 4377217 (1983-03-01), Nishikawa et al.
patent: 4975566 (1990-12-01), Uda
patent: 5650987 (1997-07-01), Kadowaki
patent: 5729512 (1998-03-01), Alon
patent: 5892741 (1999-04-01), Kadowaki et al.

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