Optical disk player

Details Optical disk player Optical disk player

1997-10-16

2000-02-15

Huber, Paul W.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 54, 369116, G11B 700, G11B 390

Patent

active

060260718

ABSTRACT:
An optical disk player for obtaining a read data signal by the use of laser light beams incident on an optical disk, wherein any laser noise component included in the read data signal due to wavelength and power variation in the light beam incident on the optical disk can be suppressed efficiently and completely. The optical disk player comprises a first light receiver for producing a read output signal by detecting a light beam which is based on the laser light emitted from a semiconductor laser device to be incident on the optical disk and is reflected therefrom; a read signal processor for producing a read data signal on the basis of the read output signal; a second light receiver for partially detecting the light beam transmitted toward the optical disk to be incident thereon and producing a variation detection signal representative of any variation in the detected light beam; and a noise suppressor for reducing the laser noise component in the read data signal by first inverting the phase of the variation detection signal obtained from the second light receiver and then adding the phase-inverted signal to the read data signal outputted from the read signal processor.

REFERENCES:
patent: 4150402 (1979-04-01), Tietze et al.
patent: 5250796 (1993-10-01), Taguchi et al.
patent: 5363363 (1994-11-01), Gage

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