Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for performing servo control for blank discs

A servo control, disc technology, applied in the field of servo control, can solve problems such as instability

Inactive Publication Date: 2006-07-26
HITACHI LG DATA STORAGE KOREA
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such servo control based on the tracking error signal may become unstable compared with the servo control based on the playback RF signal
In particular, the tilt or defocus in the servo control based on the tracking error signal may be different from the tilt or defocus in the servo control based on the playback RF signal

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
  • Method for performing servo control for blank discs
  • Method for performing servo control for blank discs

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0014] A preferred embodiment of a method of servo controlling a blank optical disc according to the present invention will now be described with reference to the accompanying drawings.

[0015] figure 1 It is a block diagram of an embodiment of an optical disc device to which a method for servo control of a blank optical disc according to the present invention is applied. This optical disc device includes an optical pickup 20, a digital recording signal processor 30a, a digital playback signal processor 30b, a channel bit encoder 40, an optical drive 41, an R / F section 50, a servo section 60, a drive section 61, and a microcomputer. 70. The digital recording signal processor 30a adds error correction code (ECC) and the like to input digital data to convert it into a recording format. Then, the channel bit encoder 40 converts the data in the recording format into a bit stream. According to the signal received from the channel bit encoder 40, the optical drive 41 outputs a d...

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 servo control method for blank discs is provided. When an optical disc is loaded, servo control suitable for the type of the loaded disc is performed. When the optical disc is a blank disc, data of a specific size is recorded in a predetermined area of the optical disc and servo control is performed again based on a playback characteristic (for example, a playback RF signal level) of the recorded data. Thus, fine servo control is performed for the blank disc based on the playback RF signal so that an accurate and stable servo operation is achieved and thus an optimal recording power can be detected, thereby improving the recording quality of the optical disc.

Description

technical field [0001] The present invention relates to a method of performing servo control on a blank disc, and more particularly to a servo control method which performs optimal servo control on a blank disc based on a playback RF signal. Background technique [0002] A general optical disc device can realize preset servo control when an optical disc is inserted. [0003] Specifically, the optical disc device determines whether the type of the inserted optical disc is CD or DVD, and also determines whether the type of the inserted optical disc is read-only (ROM), recordable (+ / -R), or repeatable. Erasable (+ / -RW or RAM). After performing the normal servo controls for laser power, tracking servo type, servo gain, etc. to suit them for the determined type, the servo gain, offset, tilt, dispersion, etc. can be finely controlled (adjusted) based on the playback RF signal. focus, etc., wherein the playback RF signal is detected when reading data recorded at a specific positi...

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
Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/004G11B7/09
CPCG11B7/1267G11B7/0945G11B7/09
Inventor 金正祐
Owner HITACHI LG DATA STORAGE KOREA