Focusing time period and power control of a multilaser diode arr

Details Focusing time period and power control of a multilaser diode arr Focusing time period and power control of a multilaser diode arr

1995-11-15

1997-09-23

Epps, Georgia Y.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369112, 369122, 369 4414, 369 4437, G11B 709, G11B 7125

Patent

active

056712090

ABSTRACT:
A method for controlling intensities of a plurality of laser beams respectively emitted on a track of an optical disk by a plurality of laser diodes according to the present invention includes a step of performing focusing servo control for focusing one of the plurality of laser beams emitted by one of the plurality of laser diodes onto the track, and concurrently controlling an intensity of the laser beam emitted by each of plurality of laser diodes to be within a predetermined range by comparing a signal which is in accordance with an intensity of the laser beam emitted by that laser beam with a reference signal. A period during which the one of the plurality of laser diodes used for the focusing does not emit the one laser beam is shorter than a response time of the focus servo control.

REFERENCES:
patent: 4811348 (1989-03-01), Arimoto et al.
patent: 4825064 (1989-04-01), Ando
patent: 5295125 (1994-03-01), Oonishi et al.
patent: 5398228 (1995-03-01), Maeda
patent: 5508990 (1996-04-01), Nagasaki et al.

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