Method for controlling read power and open-loop read control...

Details Method for controlling read power and open-loop read control... Method for controlling read power and open-loop read control...

2011-08-09

2011-08-09

Haley, Joseph (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S053260

Reexamination Certificate

active

07995447

ABSTRACT:
A method for controlling read power and an open-loop read control device using the same. The open-loop read control device is used in an optical disk writer and includes a memory, a DAC and an amplifier. The optical disk writer includes a pickup head device having a laser diode. When writing is disabled, the read power of the optical disk writer for reading the disk corresponds to a specific voltage. The memory stores a relationship curve and outputs a corresponding reference value corresponding to the specific voltage. The DAC converts the corresponding reference value into an analog corresponding reference value. The amplifier receives the analog corresponding reference value and outputs a read power control voltage, which controls the laser diode to generate a substantially constant read power in the write process.

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patent: 1402231 (2003-03-01), None
patent: 1416121 (2003-05-01), None

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