Laser light power control system having reflected light detector

Details Laser light power control system having reflected light detector Laser light power control system having reflected light detector

1996-01-18

1998-01-27

Nelms, David C.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 58, 369107, 369 59, G11B 712, G11B 713

Patent

active

057128391

ABSTRACT:
A power control system controls power of light emitted from a light source to a recording medium. The light having a first power is used to erase previous information from the recording medium and the light having a second power is used to record information in the recording medium in a recording operation. The power control system includes a detecting unit for detecting reflected light from the recording medium when the light source emits the light having the first power to erase the information from the recording medium. The detecting unit outputs a reflection signal corresponding to the reflected light. The power control system further has a control unit for controlling the first power of the light emitted from the light source so that a level of the reflection signal output from the detecting means is controlled at a predetermined target level.

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patent: 5479392 (1995-12-01), Holtslag et al.
patent: 5561642 (1996-10-01), Saito et al.
"CD-R and the compatibility with CD", Optical Memory Symposium 1994.

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