An optical apparatus capable of generating adaptive control signals

An adaptive control and optical device technology, applied in the configuration/installation of the head, optical recording/reproduction, information storage, etc., to achieve the effect of reducing demand and efficient surface defect treatment

Inactive Publication Date: 2008-07-09
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This has the disadvantage that extensive use of memory devices is required for storing the control signals and computing resources must be allocated for interpolation

Method used

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  • An optical apparatus capable of generating adaptive control signals
  • An optical apparatus capable of generating adaptive control signals
  • An optical apparatus capable of generating adaptive control signals

Examples

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Embodiment Construction

[0039] Figure 1 shows an optical device and an optical information carrier 1 according to the invention. The carrier 1 is fixed and rotated by holding means 30 .

[0040] The carrier 1 comprises a material suitable for recording information by means of a radiation beam 5 . The recording material can be eg magneto-optical, phase change, dye, metal alloys like copper / silicon or any other suitable material. Information can be recorded on the carrier 1 in the form of optically detectable areas, also called marks for rewritable media and pits for write-once media.

[0041] The device comprises an optical head 20, sometimes referred to as an optical pick-up (OPU), which is displaceable by an actuating means 21, such as a stepper motor. The optical head 20 includes a photodetection system 10 , a radiation source 4 , a beam splitter 6 , an objective lens 7 and a lens shifting device 9 . The optical head 20 may also comprise a beam splitting device 22, such as a grating or a hologra...

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Abstract

The present invention discloses an optical apparatus capable of reproducing/recording information from/to an optical carrier, e.g. a DVD or BD disk. The apparatus has control means for positioning/focusing a radiation beam (5) on the carrier and photo detection means for detection of radiation reflected from the carrier. Additionally, defect detection means (DEFO) for detection of surface defect areas (Al, A2) can indicate where surface defects, e.g. scratches etc., are present. Processing means are adapted for integrating, and preferably differentiate, error signals (RE, FE) immediately after the beam (5.b) is exiting a defect area (Al) for generating adaptive control signals (AD_ RE, AD_ FE). The optical system is adapted to apply the adaptive control signals (AD_ RE, AD_ FE) when the beam is positioned in the defect area (Al) again, thereby reducing off-track deviation as the beam (5.d) exits the defect area (Al).

Description

technical field [0001] The present invention relates to an optical device capable of reproducing / recording information from / to an optical carrier such as a CD, DVD, HD-DVD or BD disc. The optical device is capable of generating an adaptive control signal in response to surface imperfections on the carrier. The invention also relates to a corresponding method for operating an optical device. Background technique [0002] Optical storage of information on optical disc media such as CDs, DVDs and BDs is becoming more widely used in more applications. Information or data is arranged in a spiral track and is written into or read from the optical disc medium by a laser unit disposed inside the optical drive device. [0003] For example, optical disc media will inevitably contain surface defects due to careless handling by the user and / or imperfections in the manufacturing process. Various surface defects are known to exist, see eg WO2004 / 07321 for classification schemes for dif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/09
CPCG11B7/0948G11B7/09
Inventor M-H·埃尔休塞尼S·格森斯J·A·L·J·拉伊马克斯
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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