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Track jumping for optical recording media

A technology for optical recording media and magnetic tracks, applied in optical recording/reproduction, data recording, recording information storage, etc., capable of solving unspecified problems

Inactive Publication Date: 2004-12-01
THOMSON LICENSING SA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the signal does not give any indication about the disturbing influence of the eccentricity during the track jump

Method used

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  • Track jumping for optical recording media
  • Track jumping for optical recording media

Examples

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Embodiment Construction

[0023] figure 1A track jumping method according to the present invention is exemplarily given in . Before performing a track jump, in a first step 1, data relating to the eccentricity of the recording medium is obtained and the eccentricity is determined. This is preferably done on the fly, ie during normal operation with a closed tracking loop, preferably as part of a general alignment performed during start-up of a new recording medium. Of course it is also possible to determine the eccentricity only when a track jump is to be performed, eg by using the reaction of the PID controller. However, this will significantly increase the time required for track jumping. Once the eccentricity has been assessed, the angular position of the disk as measured by a dedicated calculator is taken into account to determine at which point on the recording medium the jump is initiated. To simplify the phase control operation and reduce the computational power required, the system is set to ...

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Abstract

The present invention relates to a method for track jumping for optical recording media exhibiting eccentricity, and to an apparatus for reading from and / or writing to optical recording media (16) using such method. According to the invention, a method for track jumping for optical recording media (16) exhibiting eccentricity, whereby a sled (10) and / or an actuator are moved from a start track to an end track, comprises the steps of: determining (1) the eccentricity of the optical recording medium (16), initiating (4) the track jump at minimum eccentric acceleration, completing (6) the track jump at minimum eccentric acceleration.

Description

technical field [0001] The invention relates to a method for track jumping of an optical recording medium exhibiting eccentricity and a device for reading and / or writing to an optical recording medium using this method. Background technique [0002] On optical recording media such as CDs and DVDs, data is stored in the form of pits along the tracks. Media such as DVD-RAM or DVD-RW often use a land-groove track structure in which data is written in the grooves or in both lands and grooves. The track is centered on the center of the optical recording medium, and its shape is concentric or spiral. Advantageously, the center of the track corresponds to the axis of rotation of the optical recording medium when played back in a device for reading from and / or writing to the optical recording medium. However, due to manufacturing tolerances of the device's optical recording medium and / or drive, the center of the track often does not exactly coincide with the axis of rotation durin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/09G11B7/085G11B7/095
CPCG11B7/08541G11B7/0953G11B7/08505E04G11/50
Inventor 埃里克·法尼克里斯琴·比克勒格哈德·雷纳
Owner THOMSON LICENSING SA
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