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Optical information recording medium

A technology for recording media and optical information, applied in optical recording media, data recording, information storage, etc., can solve problems such as inability to reproduce, record and reproduce, and tracking

Inactive Publication Date: 2008-08-27
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, when viewed from a playback device such as a drive, the eccentricity of the inner substrate is the worst case: it becomes the eccentricity of the front substrate + the eccentricity of the inner substrate viewed from the light incident side, and even tracking cannot be performed. Perform reproduction and record reproduction

Method used

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  • Optical information recording medium
  • Optical information recording medium
  • Optical information recording medium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0102]

[0103] On a polycarbonate substrate with a thickness of 0.6 mm and guide grooves with a track pitch of 0.80 μm, a reflective heat dissipation layer made of Ag with a film thickness of 120 nm was sequentially formed by sputtering as the first recording layer structure, and a reflective heat dissipation layer made of ZnSSiO 2 The first protective layer with a film thickness of 70nm, made of Ag 5 In 5 Ge 5 Sb 67 Te 18 The first recording layer composed of a film thickness of 17nm, made of ZnSSiO 2 Constitute the second protective layer with a film thickness of 17 nm.

[0104] On the other hand, on a cover substrate made of polycarbonate with a thickness of 0.6 mm and guide grooves having a track pitch of 0.74 μm, as a second recording layer structure, ZnSSiO was sequentially formed by sputtering. 2 The fifth protective layer with a film thickness of 70nm, made of Ag 5 In 5 Ge 5 Sb 67 Te 18 The second recording layer composed of a film thickness of 7nm, made o...

Embodiment 2

[0111]

[0112] On a polycarbonate substrate with a thickness of 0.6 mm and guide grooves with a track pitch of 0.74 μm, a first dye layer composed of a blue-green color with a film thickness of 100 μm was formed by spin coating, and the first dye layer was formed by sputtering on it. IZO (InOx, ZnOx) with a film thickness of 80 μm in the translucent layer.

[0113] On the other hand, Ag with a thickness of 150 nm was formed on a polycarbonate lid substrate with a thickness of 0.6 mm and a guide groove with a track pitch of 0.80 μm. 97 In 1 Cu 1 PD 1 layer, on which a second pigment layer composed of a blue-green color with a film thickness of 100 μm was formed by spin coating, and an IZO with a film thickness of 100 μm as a second semitransparent layer was formed thereon by sputtering.

[0114] Then, the substrate on which the above-mentioned layers were formed and the cover substrate were bonded with the recording layer facing inward through a resin intermediate layer c...

Embodiment 3

[0119] In addition to the ZnSSiO fabricated on the guide groove cover substrate with a track pitch of 0.74 μm 2 The refractive index was set to 2.4, the film thickness was set to 60nm, and the Ar flow rate during sputtering was adjusted from 1mTorr to 12mTorr, except that it was the same as in Example 1 to obtain an optical information recording medium.

[0120] As a result, the reflectance variation ratio [(reflectance-average value of reflectance) / average value of reflectance] of the recording layer on the cover substrate side with a track pitch of 0.74 μm on the light incident side was 0.19. The layer focus is entered, but the tracking is unstable, and the jitter characteristics of the recording and reproduction characteristics are good at 12.3%.

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Abstract

A practical write once or rewritable optical information recording medium having two sets of recording layer component, and its recorder / reproducer. The two-layer write once or rewritable optical information recording medium having two sets of recording layer component formed in layers on a substrate while sandwiching a resin intermediate layer and being irradiated with recording and reproducing lights from one side, characterized in that the traffic pitch is different between two sets of recording layer component and the ratio of traffic pitch difference of two sets of recording layer component = (T2-T1) / T1 (where, T1 is the traffic pitch of the light incident-side recording layer component, T2 is the traffic pitch of the rear-side recording layer component) is +0.03 through +0.15.

Description

technical field [0001] The present invention relates to an optical information recording medium such as an optical disc, and more specifically relates to an optical information recording medium with two recording layers and a recording and reproducing device thereof. Background technique [0002] Compact disks (CDs) have been popularized, and optical disks have established an important position as recording media. Furthermore, the popularity of CD-R / RW and DVD±R / RW as write-once and rewritable discs capable of recording information is notable, not only for playback only. In recent years, research and development of higher-density optical discs has been vigorously carried out. [0003] When these discs are write-once CD-R and DVD±R, they are recorded and reproduced by changing the reflectivity caused by the deformation of the pigment, and in the case of rewritable discs, they use amorphous and crystal The recorded information signal is detected by the reflectance difference...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/24G11B7/004G11B7/257
Inventor 篠塚道明岩佐博之真贝胜
Owner RICOH KK