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Method for identifying double-layer disc and optical disc apparatus

A discrimination method and a technology of an optical disc device, which are applied to optical recording/reproduction/erasing methods, optical recording carriers, recording information on magnetic disks, etc., and can solve the problems of inability to distinguish types and complex discrimination processing, etc.

Inactive Publication Date: 2008-09-10
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, in the case of Patent Document 1, the disc discrimination of the 2-layer type is not preset, and the type cannot be discriminated between DVD discs of the 2-layer type (DVD-ROM, DVD±R, DVD±RW), and Judgment is made comprehensively based on reflection signal, focus error signal, tracking error signal, etc., and the judgment process becomes complicated
[0010] Moreover, in the case of Patent Document 2, DVD-RAM and DVD±RW are discriminated based on the frequency of the wobble signal of the push-pull signal, and these DVD1-layer disks and DVD-2-layer ROMs can be discriminated. However, regarding 2 The type cannot be distinguished between layer type DVD discs (DVD-ROM, DVD±R, DVD±RW)

Method used

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  • Method for identifying double-layer disc and optical disc apparatus
  • Method for identifying double-layer disc and optical disc apparatus
  • Method for identifying double-layer disc and optical disc apparatus

Examples

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specific example 1

[0087] In the case of DVD+RW (two-layer phase-change samples), the first protective layer (ZnSSiO 2 , thickness 70nm), the first information recording layer (Ag 5 In 5 Ge 5 Sb 67 Te 18 , thickness 17nm), the second protective layer (ZnSSiO 2 , thickness 17nm), and a reflective layer (Ag, thickness 120nm) that is easy to dissipate heat was provided thereon to form a first information recording structure.

[0088] On the other hand, on a transparent substrate (polycarbonate) with guide grooves, a protective layer (ZnSSiO2, thickness 65nm), a recording layer (Ag 5 In 5 Ge 5 Sb 67 Te 18 , thickness 7nm), protective layer (ZnSSiO2, thickness 18nm), ZrCO layer (thickness 3nm), reflective layer Ag, thickness 10nm), translucent layer (ITO, In 2 o 3 and SnO, thickness 100nm) to form the second recording layer structure.

[0089] The first recording layer structure and the second recording layer structure were bonded together with a UV curable resin (SD318) having a thicknes...

specific example 2

[0093] Screen printing (ultraviolet curing) lacquer (lacquer) on the light incident surface and reflective surface of the disc produced in Specific Example 1, the resin surface was added to the light incident surface and the result of loading it into the optical disc device 1 is based on the following The reflectance obtained from the RF signal when DVD wavelength = 660nm and CD wavelength = 780nm were focused was 1%, and it was judged not to be any of the ROM type, R type, and RW type. That is, according to figure 2 In the schematic flow shown, it can be determined that the disk is out of specification in step S23.

specific example 3

[0095] On the first substrate made of polycarbonate, the first pigment layer (cyanine) was formed by spin coating (spin coat), and the IZO (In 2 o 3 and ZnO mixture). On the other hand, after IZO was formed by sputtering as a second translucent layer on a second substrate made of polycarbonate, a second dye layer (cyanine) was formed by spin coating. Next, the first substrate on which the first pigment layer was formed and the second substrate on which the second pigment layer was formed were faced to each other so that the pigment layer was located inside, and they were bonded with UV curable resin (SD318) to obtain a two-layer disk. .

[0096] Furthermore, the thickness of each structural layer was controlled as follows and produced.

[0097] Two substrates: 0.6mm, 1st pigment layer: 60nm, 1st translucent layer: 80nm, resin intermediate layer: 55μm, 2nd pigment layer: 70nm, 2nd translucent layer: 100nm

[0098] Furthermore, the track pitch of the first substrate was set ...

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Abstract

The object of the present invention is to enable the identification of double-layer disc type (recordable double-layer disc, rewritable double-layer disc and ROM-type double-layer disc) to be easily and accurately performed. The method for identifying double-layer disc contains obtaining a reflectance of each light by irradiating light of different wavelengths under focused state to each layer of a double-layer disc loaded in an optical apparatus, and identifying if the double-layer disc is a recordable double-layer disc, a rewritable double-layer disc or a ROM-type double-layer disc corresponding to the combination of reflectance of each obtained light. It is preferable that the wavelength of one light is a wavelength for DVD-based disc and the wavelength of the other light is a wavelength for CD-based disc.

Description

technical field [0001] The present invention relates to a two-layer disk discrimination method and an optical disk device. Background technique [0002] In recent years, there are various types of optical discs. In addition to the original CD series discs (CD-ROM, CD-R, CD-RW, etc.), DVD series discs (DVD-ROM, DVD±R, DVD ±RW, etc.) have also been actively developed and have reached the stage of marketing, and various proposals have been made for multilayer disks for further increasing storage capacity, generally two-layer disks, for one disk. Especially about 2-layer DVD-ROM has reached the marketing stage. [0003] Under such circumstances, an optical disc drive that mounts these various discs is required to be a compatible type that can handle these various discs with one unit. For example, in an optical disc device capable of handling DVD-based optical discs, it is required to be able to record or reproduce not only DVD-based optical discs but also CD-based optical disc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/24G11B7/004G11B19/12
Inventor 篠塚道明岩佐博之真贝胜
Owner RICOH KK
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