Laser power-drive circuit having a scaling DAC supplying a scale

Details Laser power-drive circuit having a scaling DAC supplying a scale Laser power-drive circuit having a scaling DAC supplying a scale

1996-03-08

1997-06-17

Edun, Muhammad N.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 54, 369 47, 369 59, 369124, G11B 700

Patent

active

056403810

ABSTRACT:
An optical disk recorder employs laser drive signals having diverse current or power levels. A scaling digital-analog-converter (DAC) supplies a scaled reference signal to a plurality of scaled DACs. The scaled DACs supply the diverse laser drive signals. Calibrating the scaling DAC calibrates the scaled DACs. A base array of DACs include not only the scaling DAC but a plurality of base array DACs. Such base array DACs control reading operations as well as supplying a threshold current. The threshold current is that laser drive signal current level below which laser 25 does not emit a laser beam. During writing, the CUT current is added to the laser drive currents supplied by the scaled DACs. A desired CUT current is determined by calculating a slope of the laser drive current to emission of radiation. Then the slope is extrapolated to a zero emission point below which no coherent emission of radiation occurs.

REFERENCES:
patent: 5172352 (1992-12-01), Kobayashi
patent: 5436880 (1995-07-01), Eastman et al.
patent: 5446716 (1995-08-01), Eastman et al.

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