Apparatus for and method of controlling playback light intensity

Details Apparatus for and method of controlling playback light intensity Apparatus for and method of controlling playback light intensity

1997-01-08

2000-08-29

Hindi, Nabil

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 47, 369 54, G11B 700

Patent

active

061118419

ABSTRACT:
A recording and playback device having a recording and playback controller that determines a temperature of a recording and playback medium. The controller determines the temperature by finding a recording light intensity at which a duty ratio of a playback light signal matches a duty ratio of the data to be recorded and estimating the temperature based on the recording light intensity. The controller may also determine the temperature by measuring the temperature with a temperature sensor. Based on the temperature, the recording and playback device calculates a playback light intensity at which a temperature distribution remains constant in a portion of the recording and playback medium illuminated by a playback light having the playback light intensity when the temperature of the recording and playback medium changes. The recording and playback controller also adjusts the playback light intensity based on a linear velocity of the recording and playback medium.

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