Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Information recording medium, recording/reproducing apparatus, and stamper

A technology for information recording and media, which is applied to the recording of information on magnetic disks, different record carrier forms, disk-shaped carriers, etc., can solve problems such as difficult graphics of the protective layer, and achieve the effect of maintaining flatness and stable recording and reproduction

Inactive Publication Date: 2008-02-06
TDK CORPARATION
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, since it takes a certain amount of time to draw the exposure pattern, it becomes difficult to form a protective layer pattern (mask) for etching the recording magnetic layer in a short time.

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
  • Information recording medium, recording/reproducing apparatus, and stamper
  • Information recording medium, recording/reproducing apparatus, and stamper
  • Information recording medium, recording/reproducing apparatus, and stamper

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0046] Hereinafter, preferred embodiments of the information recording medium, recording and reproducing apparatus, and disk master of the present invention will be described with reference to the accompanying drawings.

[0047] The hard disk drive 1 shown in Fig. 1 is a magnetic recording and reproducing device as an example of the recording and reproducing device of the present invention, and its structure has: Data detection unit 6 , driver 7 , control unit 8 , ROM 9 and magnetic disk 10 . In this case, as an example, the magnetic disk 10 is a disk read track type magnetic disk (graphic medium) capable of recording recording data in a perpendicular recording system, and corresponds to the information recording medium of the present invention. Specifically, as shown in FIG. 2 , in this magnetic disk 10 , a soft magnetic layer 12 , an intermediate layer 13 , and a magnetic layer 14 are formed on a glass substrate 11 in this order. In this case, the magnetic layer 14 formed o...

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

On an information recording medium, a data track pattern and a servo pattern composed of a concave / convex pattern (20) including a plurality of convex parts (21, 21...) are formed on at least one surface of a glass substrate (11) and respective concave parts (22, 22...) in the concave / convex pattern (20) are filled with non-magnetic material (15). In the concave / convex pattern (20) that constructs the data track pattern, the respective convex parts (21, 21...) are formed concentrically or in a spiral. In the concave / convex pattern (20) that constructs the servo pattern, a unit convex part length along a direction (arrow R direction) of rotation of the substrate (11) is set so that a value produced by dividing the unit convex part length by a distance from a center of the data track pattern decreases from an inner periphery to an outer periphery. The information recording medium which flatness is good in the whole area from an inner peripheral side to an outer peripheral side is provided.

Description

technical field [0001] The present invention relates to an information recording medium in which a data track pattern and a servo pattern are formed using a concave-convex pattern, and a non-magnetic material is embedded in each concave portion of the concave-convex pattern, a recording and reproducing device having the information recording medium, and a magnetic disk for manufacturing the information recording medium Master model. Background technique [0002] As a recording and reproducing apparatus having such an information recording medium, Japanese Patent Application Laid-Open No. 9-97419 discloses a magnetic recording apparatus having a disk read track (discry-totrack) type magnetic disk. In this case, in the magnetic disk, concentric recording tracks (strip-shaped protrusions) are formed by a recording magnetic member (magnetic material) on one side of a glass disk substrate (substrate). Also, guard band members (non-magnetic material) are embedded between recordin...

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
IPC IPC(8): G11B5/82G11B5/012G11B5/84
Inventor 添野佳一诹访孝裕
Owner TDK CORPARATION
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com