Patent ID: 7693022

Claim:
An optical disk writer, comprising: a pickup head device for receiving a read power control voltage and a write control device output voltage, the pickup head device comprising a laser diode for generating a light beam to write information onto a disk; an open-loop read control device for outputting the read power control voltage, wherein the open-loop read control device comprises: a memory configured to store a relationship curve specifying multiple output read power control voltages corresponding to multiple reference values and to output a selected reference value of the multiple reference values, wherein the selected reference value is output as a fixed value during the write process; a DAC (Digital to Analog Converter) for converting the reference value into an analog reference value; and an amplifier for receiving the analog reference value and outputting the corresponding read power control voltage based on the stored relationship curve, and a write control device for outputting the write control device output voltage; wherein the read power control voltage is substantially constant during the write process.