Laser diode controller for laser printer

The laser diode controller (30) includes a constant current source (60) which supplies current to a laser diode (90). A shunt switch (40) feeds current to the laser diode or to a bypass circuit (42). A thermal compensator (70) varies the current of the constant current source in accordance with the...

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Bibliographische Detailangaben
Hauptverfasser:	SPURR, ROBERT WARREN, ROCHESTER, N.Y., US, SANGER, KURT MICHAEL, ROCHESTER, N.Y., US, BAEK, SEUNG HO, PITTSFORD, N.Y., US, MARKIS, WILLIAM R., SPENCERPORT, N.Y., US, MACKIN, THOMAS ANDREW, HAMLIN, N.Y., US
Format:	Patent
Sprache:	eng ; ger
Schlagworte:	BASIC ELECTRIC ELEMENTS CORRECTION OF TYPOGRAPHICAL ERRORS DEVICES USING STIMULATED EMISSION ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR ELECTRICITY i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME LINING MACHINES PERFORMING OPERATIONS PRINTING SELECTIVE PRINTING MECHANISMS SEMICONDUCTOR DEVICES STAMPS TRANSPORTING TYPEWRITERS
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Beschreibung
Zusammenfassung:	The laser diode controller (30) includes a constant current source (60) which supplies current to a laser diode (90). A shunt switch (40) feeds current to the laser diode or to a bypass circuit (42). A thermal compensator (70) varies the current of the constant current source in accordance with the duty cycle of the laser diode, to even out the variations in optical efficiency of power conversion in the laser diode caused by temperature variations. A thermoelectric cooling controller (80) maintains the substrate (14) on which the laser diode is arranged at a constant temperature. The constant current source is preferably connected to system earth, and the shunt switch to the laser power supply (62).