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Device and method for reading multilayer optical disk

A kind of equipment, beam technology, applied in the direction of optical recording/reproduction, optical recording/reproduction/erasing method, beam source, etc., to achieve the effect of easy further processing

Inactive Publication Date: 2005-11-30
THOMSON LICENSING SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned problems occur not only in double-layer phase-change materials, but also in multi-layer discs of combinations of materials, in which information is stored sequentially, which results in a dark-bright sequence in transmitted light.

Method used

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  • Device and method for reading multilayer optical disk
  • Device and method for reading multilayer optical disk
  • Device and method for reading multilayer optical disk

Examples

Experimental program
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Embodiment Construction

[0020] Figure 1 shows a simplified diagram of a device according to the invention. The optical data carrier in this embodiment is a disc 1, shown in cross section. Dimensions are not drawn to scale and are intended to more clearly illustrate features. The disc 1 is provided with a first recording layer 11 and a second recording layer 12 . The first layer 11 is a translucent layer and the second layer 12 is a reflective layer. A transparent cover layer 13 and an intermediate layer 14 are also provided, but will not be described in detail here. To the right of layer 11 a stack 15 is indicated, instead of a single layer 11 , again multiple layers may be arranged above layer 12 . However, only the case of a single layer 11 is described here, and the application to a stack 15 is a task within the scope of a person skilled in the art.

[0021]The device comprises a semiconductor laser 2 used as a light source to generate a scanning beam 3 . The provided lasers 2 are driven with...

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Abstract

The invention refers to a device and a method for scanning an optical data carrier (1) by means of a main scanning beam (3) being reflected by the data carrier (1) and being detected by means of a photodetector (10), the data carrier (1) having first and second layers (11,12) to be scanned, the second layer (12) being scanned through the first layer (11), light passing the first layer (11) being shaded dependent on local properties of the first layer (11). An object of the invention is to propose a device having increased performance even for use with multi layer disks (1) having a layer (11) causing light fluctuations on a layer (12) to be scanned, as well as a respective method. According to the invention such device is provided with means (2,7,17) for keeping an output signal (D) of the photodetector (10) independent of variations of shading.

Description

technical field [0001] The invention relates to a device and a method for reading and / or writing to a dual-layer or multi-layer optical disc, also called scanning of such an optical data carrier. Background technique [0002] Using multi-layer discs is one possible way to increase the storage capacity of optical discs. Among other methods, phase-change double-layer recording is considered to be one of the most promising techniques for recording optical discs. A dual layer disc is provided with a translucent and partially reflective first layer and a reflective second layer. The second layer is scanned with a beam passing through the first layer. In the case of a partially written first layer or in the case of discs according to the so-called hard disk partition format, the first layer leads to a Light intensity fluctuates. These light fluctuations are also referred to below as shading or shading effects. According to the partitioning format of the hard disk, the partiti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B20/10G11B7/00G11B7/005G11B7/007G11B7/013G11B7/09G11B7/125G11B7/13G11B7/24G11B7/24038G11B7/24085G11B7/24088G11B20/00G11B23/28
CPCG11B20/00586G11B23/281G11B7/1263G11B20/00086G11B7/24085G11B7/00736G11B7/0903G11B2007/0013G11B7/0052G11B7/00718G11B7/00745G11B7/24088G11B7/24038G11B7/13G11B7/005G11B20/10
Inventor 霍尔格·霍夫曼哈特穆特·里克特
Owner THOMSON LICENSING SA
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