Illuminating multiple data tracks of an optical disk with a lase

Details Illuminating multiple data tracks of an optical disk with a lase Illuminating multiple data tracks of an optical disk with a lase

1996-07-08

1998-10-20

Epps, Georgia Y.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4437, 369102, 369107, 369116, G11B 700

Patent

active

058257438

ABSTRACT:
Methods and apparatus are provided for illuminating an optical disk in a multi-track optical disk reader. A laser beam is collimated and focused onto an area including multiple, adjacent data tracks on the optical disk. To minimize noise caused by interference resulting from the reflection of multiple beams from the optical disk the coherency of the laser beam is reduced. This is accomplished by one or more of the following techniques: passing the laser beam through a multi-mode optical fiber, combining laser beams from multiple independent laser sources, and modulating the laser operating current at high frequency.

REFERENCES:
patent: 4116542 (1978-09-01), Moncur et al.
patent: 4486870 (1984-12-01), Pettigrew et al.
patent: 5426623 (1995-06-01), Alon et al.
patent: 5535189 (1996-07-01), Alon et al.
patent: 5608716 (1997-03-01), Koyama et al.

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