Optical storage apparatus having an automatic laser power contro

Details Optical storage apparatus having an automatic laser power contro Optical storage apparatus having an automatic laser power contro

1998-02-13

2000-06-06

Neyzari, Ali

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 54, 369 58, G11B 700

Patent

active

060727616

ABSTRACT:
A light emission fine adjustment processing unit of an optical storage apparatus brings a light beam to a test zone in an on-track state, sequentially instructs testing powers at two points to a light emission current source circuit, allows a laser diode to emit light, simultaneously instructs a subtraction current of the testing powers at two points to a subtraction current source circuit, and adjusts an instruction value so that a measuring power of a monitor power measuring unit is equal to the instructed testing power. An automatic power control holding unit holds an automatic power control unit at the time of the light emission of the laser diode. A test zone confirming unit activates a light emission adjustment process when the present position lies within a range of the test zone, and prevents a breakage of user data when the present position is out of the test zone range. A light emission timing control unit allows the light emission to be performed in only a data field while avoiding an ID field of a sector.

REFERENCES:
patent: 5398227 (1995-03-01), Miyaoka et al.
patent: 5450383 (1995-09-01), Call et al.
patent: 5790491 (1998-08-01), Jaquette et al.

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