Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Multi layer disc

A technology of optical discs and Blu-ray discs, which is applied in the direction of optical record carrier, optical record carrier manufacturing, optical recording/reproduction, etc., and can solve the problems of increased manufacturing cost of optical discs, deterioration of signal characteristics, and reduced output.

Inactive Publication Date: 2007-10-10
LG ELECTRONICS INC
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this causes a reduction in yield under the current given manufacturing conditions, thereby causing a significant increase in the cost of disc manufacturing
On the other hand, when the thickness tolerance increases unnecessarily, the signal characteristics deteriorate
In this case, errors are generated during recording and reproducing operations

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Multi layer disc
  • Multi layer disc
  • Multi layer disc

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0023] Here, preferred embodiments of the multilayer optical disc according to the present invention will be described in detail with reference to the accompanying drawings.

[0024] The present invention is applicable to various types of multilayer optical discs in which a plurality of recording layers are laminated on a single substrate.

[0025] Referring to FIG. 3 , a dual-layer Blu-ray Disc (BD) 300 is shown. The dual-layer BD has a laminated optical disc structure including a substrate 30 , a first recording layer 31 ( L0 ), a space layer 34 , a second recording layer 33 ( L1 ), and a cover layer 32 .

[0026] The double layer BD300 has a total thickness Dt of 1200 μm. The sum of the thicknesses of the cover layer 32, the second recording layer 33, and the space layer 34 corresponds to the thickness from the exposed surface of the cover layer 32 to the first recording layer 31, that is, the thickness L0t, which is 100 μm, and in which the cover layer 32 With a refracti...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A multi-layer disc is disclosed which includes a plurality of recording layers, as in a dual layer blu-ray disc. In the multi- layer disc, the tolerance of a transparent substrate thickness from a surface of a cover layer to each recording layer is set to be different from those of transparent substrate thicknesses to other recording layers within a range in which no degradation in the characteristics of recording and reproduction signals for each recording layer occurs. Accordingly, it is possible to more efficiently manufacture multi -layer discs, to achieve an improvement in the manufacturing yield of multi-layer discs, and to achieve a reduction in the manufacturing costs of multi-layer discs.

Description

technical field [0001] The present invention relates to multilayer optical disks, and more particularly to multilayer optical disks in which the tolerance of the thickness from the surface of the cover layer to each recording layer in the optical disk is set differently from the thickness tolerances to other recording layers. Background technique [0002] A high-density optical disc, such as a Blu-ray Disc (BD), capable of recording or reproducing a large amount of high-quality video and audio data, is being developed and is expected to be commercially available. Generally, such an optical disc has a multilayer structure in which a plurality of recording layers are formed on a single optical disc substrate to achieve an increase in recording capacity. [0003] Referring to FIG. 1 , a single layer BD 100 is shown. The single-layer BD100 has a laminated optical disc structure including a substrate 10, a recording layer 11 and a cover layer 12. [0004] Typically, a single-la...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G11B7/24G11B7/24038
CPCG11B7/24038G11B7/26
Inventor 金进镛朴景灿
Owner LG ELECTRONICS INC
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com