Method and apparatus for automatically controlling a power of a laser diode
AssigneeSamsung Electronics Co., Ltd.
InventorHong-gie Hwang
Life of this patent
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Abstract
A method and apparatus to automatically control an output power of a laser diode, include generating an error voltage between an output voltage of the laser diode sampled during an automatic power control period and a reference voltage, and performing proportional-integral processing on the error voltage to generate a compensated control voltage and applying the compensated control voltage to the laser diode.
Claims34
A method of automatically controlling an output power of a laser diode, the method comprising:
- generating an error voltage between an output voltage of the laser diode sampled during an automatic power control period and a reference voltage;
- and
- performing proportional-integral processing on the error voltage to generate a compensated control voltage and applying the compensated control voltage to the laser diode.
A method of automatically controlling an output power of a laser diode, the method comprising:
- setting an automatic power control period for the laser diode;
- converting an output voltage of the laser diode from an analog form to a digital form;
- generating an error voltage between a reference voltage and an effective output voltage extracted from digital output voltages sampled during the automatic power control period;
- performing proportional-integral processing on the error voltage to generate a compensated control voltage and generating an effective control voltage using the compensated control voltage;
- and
- converting the effective control voltage from the digital form to the analog form.
A computer readable medium having embodied thereon a computer program for automatically controlling an output power of a laser diode comprising:
- generating an error voltage between an output voltage of the laser diode sampled during an automatic power control period and a reference voltage;
- and
- performing proportional-integral processing on the error voltage to generate a compensated control voltage and applying the compensated control voltage to the laser diode.
A computer readable medium having embodied thereon a computer program for automatically controlling an output power of a laser diode, comprising:
- setting an automatic power control period for the laser diode;
- converting an output voltage of the laser diode from an analog form to a digital form;
- generating an error voltage between a reference voltage and an effective output voltage extracted from digital output voltages sampled during the automatic power control period;
- performing proportional-integral processing on the error voltage to generate a compensated control voltage and generating an effective control voltage using the compensated control voltage;
- and
- converting the effective control voltage from the digital form to the analog form.
An apparatus to automatically control an output power of a laser diode, the apparatus comprising:
- an error voltage generation unit generating an error voltage between an output voltage of the laser diode sampled during an automatic power control period and a reference voltage;
- and
- a control voltage generation unit performing proportional-integral processing on the error voltage provided from the error voltage generation unit to generate an effective control voltage.
A laser printer controller with a laser diode, comprising:
- an engine processor module controlling an entire operation of a printer engine;
- and
- an automatic power control module of the laser diode automatically controlling an output power of the laser diode positioned within a laser scanning unit by sampling an effective output voltage from an output power of the laser diode during a automatic power control period and performing proportional-integral processing on the effective output voltage, wherein the laser printer controller is structured in a single integrated circuit.
A printer controller controlling a laser diode and connected to a printer engine, comprising:
- an engine processor module controlling an operation of the printer engine;
- and
- an automatic power control module automatically controlling an output power of the laser diode by generating an error voltage between an output voltage of the laser diode sampled during an automatic power control period and a reference voltage, and performing proportional-integral processing on the error voltage to generate a compensated control voltage and applying the compensated control voltage to the laser diode.
A method of a printer controller controlling a laser diode and connected to a printer engine, the method comprising:
- controlling an operation of the printer engine;
- automatically controlling an output power of the laser diode by generating an error voltage between an output voltage of the laser diode sampled during an automatic power control period and a reference voltage;
- and
- performing proportional-integral processing on the error voltage to generate a compensated control voltage and applying the compensated control voltage to the laser diode.
A computer readable medium having embodied thereon a computer program for automatically controlling an output power of a laser diode, comprising:
- controlling an operation of the printer engine;
- automatically controlling an output power of the laser diode by generating an error voltage between an output voltage of the laser diode sampled during an automatic power control period and a reference voltage;
- and
- performing proportional-integral processing on the error voltage to generate a compensated control voltage and applying the compensated control voltage to the laser diode.
Dependencies are inferred from the claim text.