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Disk driving unit

A drive unit and disc technology, applied to information recording, magnetic recording, information storage, etc. on the magnetic disc, can solve the problems of difficult recording operation and increased number of retries

Inactive Publication Date: 2004-04-28
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, there is a problem that the number of retries increases, and it becomes difficult to stably perform a recording operation when contamination on the disc surface increases

Method used

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  • Disk driving unit
  • Disk driving unit
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0019] Next, an embodiment of the disk drive unit of the present invention will be explained. The optical disc loaded in the disc drive unit of this example may be a CD-type disc such as a CD-R and a disc called a DVD (Digital Versatile Disc / Digital Video Disc). The invention is also applicable to disc drive units adapted to other types of discs.

[0020] figure 1 is a block diagram of the main part of the example disk drive unit. Such a disk drive unit implements data recording / reproducing operations corresponding to requests from the connected host 100 .

[0021] For example, the disc 90 is a DVD type disc or a CD type disc such as CD-R and CD-ROM. The disk 90 is mounted on a turn table 7 and rotated at a constant linear velocity (CLV) or a constant angular velocity (CAV) by a pickup 1 in recording / reproducing data.

[0022] The pickup 1 reads data recorded in the disc 90 in an emboss pit pattern or a phase change pit (mark) pattern, or records / erases data such as a phas...

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PUM

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Abstract

There is provided a disk drive unit which is capable of making control corresponding to contaminant and defect by discriminating the contaminant (dust, scratch) on the disk surface from the defect on the recording plane. In a pull-in signal PI corresponding to reflected light from a disk, a defect detecting signal corresponding to a signal whose level change is relatively quick corresponding to the defect of the recording plane and a contaminant detecting signal which corresponds to a signal whose level change is relatively slow corresponding to the contaminant on the disk surface are generated. When the defect detecting signal is at low level for example, a system controller retries a recording operation or increases laser light when the contaminant detecting signal is at low level. A quantity of output light of a laser diode is controlled so that a product of output light of a laser diode and reflected light from the disk amounts to a predetermined level.

Description

technical field [0001] The present invention relates to disc drive units. Background technique [0002] Hitherto, there have been various devices that record / reproduce data by irradiating laser light to a recording medium such as a disc. [0003] For example, as such an optical disc recording medium, a CD (Compact Disc) type disc suitable for multimedia use and a disc called DVD (Digital Versatile Disc / Digital Video Disc) have been developed. A recording apparatus adapted to those optical discs irradiates laser light modulated by recording data onto tracks on the disc to record data using, for example, phase change recording. [0004] However, since the DVD itself is handled, for example, in a naked manner, there is a possibility that the surface of the disc collects dust or is scratched when a user uses the disc. Such dust and scratches (hereinafter, those such as dust and scratches on the surface of the disc will be referred to as contaminants) become a factor for blocki...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/126G11B7/00G11B7/0037G11B7/0045G11B7/125G11B19/04
CPCG11B7/0045G11B7/126G11B7/00375
Inventor 近藤真通三上达郎西田纪夫
Owner SONY CORP