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Method and device for writing multiple-layer optical discs

An access device and write-inhibiting technology, which is applied in the direction of optical recording/reproduction, optical recording/reproduction/erasing method, head configuration/installation, etc., and can solve problems such as information damage

Inactive Publication Date: 2007-03-28
KONINK PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In such multi-layer discs, especially for recordable / rewritable optical media, maintaining proper focus conditions is more important than in the case of single-layer discs: non-optimal focus conditions inherently pose a threat to adjacent layers, information that exists there may be inadvertently corrupted

Method used

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  • Method and device for writing multiple-layer optical discs
  • Method and device for writing multiple-layer optical discs
  • Method and device for writing multiple-layer optical discs

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Embodiment Construction

[0013] Fig. 1 schematically depicts an optical disc drive device 1, suitable for storing information on an optical disc 2, typically a DVD or a CD. In order to rotate the disk 2 , the disk drive 1 comprises a motor 4 fixed to a frame (not shown for simplicity) for defining an axis of rotation 5 .

[0014] In this embodiment the disc 2 (the thickness of which is shown exaggerated) has 2 storage layers 2A and 2B, but it should be noted that the invention also relates to discs having 3 or more layers. The term "multilayer" is used to mean two or more layers.

[0015] The disk drive apparatus 1 further includes an optical system 30 for scanning a track (not shown) of the disk 2 by a light beam. More specifically, in the typical configuration depicted in FIG. 1 , the optical system 30 includes a beam generating device 31 (typically a laser such as a laser diode) configured to generate a beam 32 . In the following, different parts of the light beam 32 following the optical path 39...

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Abstract

A method of writing information in a storage layer (2A,2B) of a multi-layer optical storage medium (2) comprising two or more storage layers (2A,2B), especially multi-layer recordable and rewritable optical discs, especially DVD discs or BD discs. The method comprises the steps of monitoring a focus condition of an optical write beam (32b), and inhibiting the writing process in case of an axial focus displacement event. Also described is a medium access device (10), capable of writing information in a storage layer (2A,2B) of a multi-layer optical storage medium (2). The medium access device (10) comprises: light beam generating means (31) for generating a write light beam (32); focussing means (34) for focussing the write (32) in a focal spot (F) at a target storage layer (2A); write inhibit means (64) for inhibiting a writing process in case of an axial focus displacement event.

Description

technical field [0001] The present invention generally relates to a method and apparatus for writing information to a multilayer optical disc. Background technique [0002] As is known, optical storage discs comprise a storage space of at least one track, either in the form of a continuous spiral or in the form of a plurality of concentric circles, where information can be stored in the form of data patterns. Optical discs are very successful, and several different types of discs have been developed. One type is DVD (Digital Versatile Disc), and the invention relates in particular to DVD discs. However, the gist of the present invention is also applicable to other types of optical media, such as Blu-ray discs. [0003] Optical discs may be of the read-only type, in which case the disc contains information that is recorded during the manufacturing process and can only be read by the user. Optical storage discs can also be of the writable type, in which case information is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/24G11B7/00G11B7/0045G11B7/09G11B7/24038
CPCG11B2007/0013G11B7/0045G11B7/24038G11B7/0946G11B7/09
Inventor G·S·斯坦
Owner KONINK PHILIPS ELECTRONICS NV