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Method and apparatus for measuring the depth of a data record layer in an information record medium

A technology for data recording and information recording, applied in data recording, recording of information on disks, optical recording/reproduction, etc., can solve problems such as insufficient multi-layer disks

Inactive Publication Date: 2006-12-06
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This may be sufficient for discs with only a single layer, but not for multi-layer discs

Method used

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  • Method and apparatus for measuring the depth of a data record layer in an information record medium
  • Method and apparatus for measuring the depth of a data record layer in an information record medium
  • Method and apparatus for measuring the depth of a data record layer in an information record medium

Examples

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Embodiment Construction

[0028] Figure 4 A known optical disc device 100 is shown, comprising: an aberration correction element driving circuit 102, which applies a voltage to an aberration correction element (such as a liquid crystal aberration correction element 104) and a control circuit 106 which receives a voltage from an optical pickup 108. signal and controls and drives the actuator 110; the aberration correction element drive circuit 102; and the laser source 112. The control circuit 106 enables the laser source 112 to emit light beams and controls the position of the objective lens 114 according to the signal from the optical pickup 108 . Also, it drives the aberration correcting element drive circuit 102 to improve the information signal from the optical pickup 108 .

[0029] Figure 5The components of the optical system are shown in addition to the laser source, collimating lens and photodetector. The light beam that has been converted into parallel light by the collimator lens passes t...

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Abstract

This invention provides apparatus and method for measuring the depth of data record layers of an optical storage disc having a cover layer of thickness, an entrance surface, and, for example, a first data layer (L0), a second data layer (L1) and a third data layer. The optical apparatus comprises a spherical aberration compensator, and an objective lens mounted in an actuator. In order to provide the spherical aberration compensator with right control signal, the depth of each data layer must be measured and means are provided for measuring the depth of the data layer(s) of a single- or multi- layer disc, and this achieved by using the distance between zero-crossings of the focus error signal (FES). A proportionality constant between the actuator current and the depth of the record layer can be calculated. Oscillations of the rotating medium may compensated.

Description

technical field [0001] The present invention relates to a method and device for measuring the depth of a data recording layer in an information recording medium, a spherical aberration compensation device utilizing such a depth measurement, and a method for obtaining data from one or more devices comprising such a spherical aberration compensation device. Data recording layer A data recording and / or retrieval device for retrieving data from an information recording medium. Background technique [0002] Optical data storage systems provide a means for storing large amounts of data on disks. Data is accessed by focusing a laser beam on 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 the data is detected as changes in reflectivity as a laser beam passes through these marks. [0003] Erasable optical systems are also known. These systems typically use lasers to heat the...

Claims

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Application Information

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IPC IPC(8): G11B19/12G11B7/09G11B7/00G11B7/135
CPCG11B19/12G11B7/13927G11B2007/0013G11B7/09
Inventor S·斯塔林加T·W·塔克
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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