Laser writer having high speed high current laser driver

Details Laser writer having high speed high current laser driver Laser writer having high speed high current laser driver

1995-05-31

1997-01-28

Shoop, Jr., William M.

Electrical transmission or interconnection systems

Plural load circuit systems

Selectively connected or controlled load circuits

307 11, 372 9, 372 26, 372 38, 372 50, H02J 314

Patent

active

055980406

ABSTRACT:
A diode laser writer having a high speed, high current, precision laser driver provides for switching a constant current source between a write laser and a dump load. An inductor is provided in a leg of the circuit such that the inductor and the constant current source form a series circuit with whichever of the dump load and the write laser that is switched ON. The inductor keeps the current constant because the inductor produces an e.m.f. counter to the e.m.f. of the load inductance. The added inductance will generate an e.m.f. counter to that of the load inductance, serving to augment the compliance voltage. The overall effect of the added inductor is to restore the constant current property of the circuit.

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