Semiconductor laser driving circuit, semiconductor laser device,

Details Semiconductor laser driving circuit, semiconductor laser device, Semiconductor laser driving circuit, semiconductor laser device,

1996-08-15

1998-12-08

Huber, Paul W.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 54, G11B 700

Patent

active

058480447

ABSTRACT:
There is provided a semiconductor laser driving circuit. The circuit has: an amplifier for receiving an emission level setting voltage, and outputting a first driving signal on the basis of the emission level setting voltage; a driving signal generation circuit for receiving a control signal for instructing a light-emission period of a semiconductor laser, and the first driving signal output from said amplifier, and outputting a second driving signal corresponding to a level of the first driving signal in accordance with a light-emission or extinction period; a driving circuit for receiving the second driving signal output from said driving signal generation circuit, and generating and outputting a driving current to be supplied to the semiconductor laser; and a control circuit for receiving the emission level setting voltage, and adjusting a level of the second driving signal during the extinction period in correspondence with the emission level setting voltage.

REFERENCES:
patent: 4701609 (1987-10-01), Koishi et al.
patent: 4754460 (1988-06-01), Kimura et al.
patent: 4791632 (1988-12-01), Anderson et al.

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