Pickup head having two laser light sources for separately readin

Details Pickup head having two laser light sources for separately readin Pickup head having two laser light sources for separately readin

1995-11-13

1999-05-04

Swann, Tod R.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4437, 369 94, 369116, G11B 700

Patent

active

059011327

ABSTRACT:
An optical pickup system for regenerating information stored on an optical disk including a pair of recording surfaces thereon, is provided with a pair of light sources, a detector, an objective lens, a signal detection unit, and a beam splitter having a first and a second recording surface. In this system, when the first light source is used for reproducing an information signal on the first recording surface of the optical disk, the first light beam transmitted through the second surface of the beam splitter is used for detecting the focusing error signal of the first recording surface of the optical disk. When the second light source is used for detecting the focusing error signal of the second recording surface of the optical disk, the second light beam reflected from the second surface of the beam splitter is utilized for reproducing an information signal on the second recording surface with the first light source turned off.

REFERENCES:
patent: 5485452 (1996-01-01), Maeda
patent: 5526336 (1996-06-01), Park et al.
patent: 5627814 (1997-05-01), Lee

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