Method and appts. for mfg. disc-shaped recording medium

A recording medium and disk-shaped technology, which is applied in the field of manufacturing disk-shaped recording media such as magneto-optical disks, can solve problems such as fluctuations in the thickness of the protective film, achieve uniform thickness of the protective film, eliminate film thickness differences between the inner and outer edges of the recording medium, and stabilize The effect formed

Inactive Publication Date: 2003-12-24
SONY CORP
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has not been possible to completely eliminate fluctuations in the thickness of the protective film by this method, which still produces a very small difference in thickness between the inner and outer edges of the disc.

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 and appts. for mfg. disc-shaped recording medium
  • Method and appts. for mfg. disc-shaped recording medium
  • Method and appts. for mfg. disc-shaped recording medium

Examples

Experimental program
Comparison scheme
Effect test

no. 2 approach

[0116] A second embodiment of the disc-shaped recording medium according to the present invention will be described below.

[0117] refer to Figure 5 to Figure 7 , the manufacturing apparatus of a disc-shaped recording medium includes a rotating shaft 31 having a flange 33 having a substantially annular planar configuration on an end 31a thereof, the end 31a supporting a disc substrate 32 of the disc-shaped recording medium. The rotating shaft 31 has a central groove 34, which is opened on the end 31a. The disk-shaped recording medium manufacturing equipment also includes a rotating disk unit 38 , the disk body 36 of which covers the central hole 35 on the disk substrate 32 of the disk-shaped recording medium, and the central shaft 37 inserted into the groove 34 of the rotating shaft 31 .

[0118] The rotating shaft 31 is substantially cylindrical in shape and has a flange 33 at its end 31a. The flange 33 is provided not at the top end of the end 31 a but slightly below the...

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

PropertyMeasurementUnit
thicknessaaaaaaaaaa
diameteraaaaaaaaaa
refractive indexaaaaaaaaaa
Login to view more

Abstract

When applying a coating film by a spin coating method on a disc-shaped recording medium, the film thickness difference between the inner rim and the outer rim of the disc has to be suppressed. To this end, a coating liquid is supplied to a center portion of the disc-shaped recording medium and a rotary disc, as a center shaft of a rotary disc is inserted into a recess formed in a turntable on which the disc-shaped recording medium is set and the disc-shaped recording medium and a rotary disc are run in rotation. The coating liquid is spread under the centrifugal force caused by rotation for forming a coating film on the disc-shaped recording medium.

Description

technical field [0001] The present invention relates to a method and apparatus for manufacturing a disk-shaped recording medium such as a magneto-optical disk. More particularly, it relates to methods and apparatus for applying coating fluids, such as protective film materials, on disc-shaped recording media. Background technique [0002] The magneto-optical recording system is such a system: this system uses optical radiation to locally heat the recording layer of the magnetic material to a temperature higher than the Curie temperature or the temperature compensation point to reduce the coercive force of this part, and the recording magnetic field is applied To this portion to partially change the direction of the magnetic field of the recording layer to record an information signal. The magneto-optical recording system is being put into practical use in an optical storage system, an external memory device of a computer or an audiovisual signal recording device. [0003] ...

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 Patents(China)
IPC IPC(8): B05C11/08B05D1/00B29D17/00G11B7/26G11B11/105
CPCB05D1/005G11B11/10582Y10S425/81B05C11/08B29D17/005G11B7/26
Inventor 菊地稔
Owner SONY CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap