Laser light control circuit, optical pickup unit and optical pic

Details Laser light control circuit, optical pickup unit and optical pic Laser light control circuit, optical pickup unit and optical pic

1998-03-04

2000-01-04

Tran, Thang V.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

G11B 700

Patent

active

060117680

ABSTRACT:
A laser light control circuit with low power consumption and a small amount of heat generation by superposing a control current output from a light quantity control circuit with a high-frequency current output from a high frequency current generator on the basis of the control current, includes a bias circuit which sets a bias current of the high-frequency current in response to the operation voltage of a semiconductor laser element.

REFERENCES:
patent: 4426693 (1984-01-01), Satoh et al.
patent: 4733398 (1988-03-01), Shibagaki et al.
patent: 5036519 (1991-07-01), Ena et al.
patent: 5097473 (1992-03-01), Taguchi
patent: 5495464 (1996-02-01), Fujikawa et al.
patent: 5579329 (1996-11-01), Taguchi
patent: 5835476 (1998-11-01), Yamasaki et al.

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