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Optical storage in discs having multiple data layers

A data and data retrieval technology, applied in optics, data recording, optical components, etc., can solve the problems of serious adverse effects, deterioration of readout signal error signals, etc.

Inactive Publication Date: 2006-12-13
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This parasitic part will be added to the main part and has the detrimental effect of degrading the readout signal as well as the error signal used to keep the scanning spot focused on the track
For dual-layer discs (M = 2), this adverse effect is relatively small, but for multi-layer discs (> 2), the adverse effect becomes more and more serious. Therefore, it is obvious that some means is needed to suppress the multi-layer layer-to-layer crosstalk

Method used

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  • Optical storage in discs having multiple data layers
  • Optical storage in discs having multiple data layers
  • Optical storage in discs having multiple data layers

Examples

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Embodiment Construction

[0019] US Patent No. 6385157B1 describes an optical pickup device for recording and reproducing information from an information recording medium having a plurality of recording layers. Such an optical pick-up device includes an outward routing system, wherein the laser light from the semiconductor laser is collimated by a collimator lens to form a light flux, and then a beam splitter is used to reflect the laser light, And through an objective lens, the laser light is irradiated on the multi-layer optical disc, and the optical pickup device also includes an inward routing optical system, wherein the light reflected by the optical disc passes through the diaphragm after being transmitted through the beam splitter and the objective lens The lens and pinhole receive on the photodetector, whereby the information recorded on the desired recording layer can be reproduced.

[0020] However, if the diameter of the pinhole is made too small, then while a substantial portion of the para...

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Abstract

Optical pick-up apparatus for retrieving data stored on an optical storage disc having a plurality of record layers (6, 7), the radiation beam reflected back from the disc when a first layer (7) is irradiated comprising radiation reflected back from the first layer (7) and radiation reflected back from one or more of the other layers(6). A spatial filter (8) is provided which is arranged and configured to spatially filter the radiation beam so as to cause the radiation reflected by the first record layer (7) and the radiation reflected by any of the other record layers (6) of the optical storage disc to be spatially separated, such that at least a substantial portion of the radiation reflected back from the other layers (6) can be selectively eliminated from the radiation beam prior to retrieval therefrom of the data.

Description

technical field [0001] This invention relates generally to optical data storage systems and, more particularly, to apparatus for reading data stored on optical discs having multiple data storage surfaces or layers. Background technique [0002] Optical data storage systems provide means for storing large amounts of data on disks. The data is accessed by focusing a laser beam onto the data layer of the disc and then detecting the reflected beam. In one known system, data is permanently embedded in the disc as marks, such as pits, and is detected as changes in reflectivity when a laser beam passes over the marks. [0003] Erasable optical systems are also known. These systems typically use lasers to heat the data layer above a critical temperature for writing and erasing data. Magneto-optical recording systems record data by orienting the magnetic domains of an optical spot in an upward or downward position. Data is read out by directing a low-power laser at the data layer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/005G11B7/13G02B21/00G11B7/135
CPCG11B7/1381G11B7/133G11B7/005
Inventor S·斯塔林加
Owner KONINKLIJKE PHILIPS ELECTRONICS NV