Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1995-06-07
1999-03-02
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, G11B 700
Patent
active
058780157
ABSTRACT:
A laser driver for controlling an electrical current supplied to a laser in an optical disc system. The laser driver includes pass transistors for delivering electrical current to the laser, an operational amplifier for setting a reference voltage on the bases of the pass transistors, and a CMOS buffer for applying a drive voltage to emitter circuits of the pass transistors. The drive voltage has a first voltage level and a second voltage level, and the electrical current is supplied to the emitter circuits only when the drive voltage is at the first voltage level. The laser driver further includes a switch for switching the drive voltage between the first voltage level and the second voltage level so that electrical power is consumed only when the laser is energized and enhanced rise and fall switching characteristics are thereby achieved.
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pate
Lewis David E.
Schell David L.
Braun Robert T.
Clark Ronald J.
Discovision Associates
Edun Muhammad N.
Thyfault Paul M.
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