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Recording medium, recording and reproducing method and recording and reproducing device

A technology for recording media and recording areas, applied in optical recording/reproducing/erasing methods, optical recording carriers, optical recording carrier manufacturing, etc., capable of solving problems such as servo signals and adverse effects of recording signals

Inactive Publication Date: 2002-04-03
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, especially for optical recording media that record and reproduce information by laser light, it will have adverse effects on its servo signals and recording signals

Method used

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  • Recording medium, recording and reproducing method and recording and reproducing device
  • Recording medium, recording and reproducing method and recording and reproducing device
  • Recording medium, recording and reproducing method and recording and reproducing device

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0218] In this example, a light-transmitting substrate 1 made of polycarbonate resin having a diameter of 120 nm was provided. The selection range of the thickness of the light-transmitting substrate 1 is as follows: as long as the change of the transmittance and reflectance of the light-transmitting substrate 1 can be detected. Here, the selected thickness of the light-transmitting substrate 1 is 0.6 mm.

[0219] The following is the correlation between wavelength and transmission coefficient measured by two samples, one obtained after irradiating the light-transmitting substrate with ultraviolet rays from a UV lamp for 110 minutes, and the other after irradiating the light-transmitting substrate with ultraviolet rays1 got before. In FIG. 19, a solid-line curve 61 shows a correlation between wavelength and transmittance corresponding to a sample obtained before light-transmitting the substrate 1 with ultraviolet radiation. In FIG. 19, a dotted line curve 62 shows a correlat...

example 2

[0230] In this example, recording of information is carried out by selectively irradiating the light-transmissive substrate 1 with ultraviolet rays.

[0231] In particular, in this case, a light-transmitting substrate made of polycarbonate resin with a diameter of 120 mm was used, and in the design of the substrate, formed such as figure 1 Very small bumps shown. Moreover, in this case, the thickness of the substrate 1 can be selected in the following range: as long as changes in the transmittance and reflectance of the substrate 1 can be detected. Here, the selected thickness of the substrate 1 is 0.6 mm.

[0232] On one main surface of said light transmissive substrate 1, grooves including four memory areas having a track pitch of 0.40 µm to 0.36 µm and a minimum variation of 0.02 µm are formed.

[0233] In actual design, needless to say, pit marks and wobble grooves for reading addresses and the like may also be formed on one main surface of this light-transmitting substr...

example 3

[0240] In this Invention Example 3, referring to Invention Example 2 as described above, since information can be recorded on the light-transmitting substrate 1 by selectively irradiating an arbitrary position of the light-transmitting substrate 1 with ultraviolet rays, it is possible to The light-transmitting substrate 1 is selectively irradiated, information is recorded B to the light-transmitting substrate 1, and the recorded information B is reproduced using the reproducing apparatus according to the present invention.

[0241] Also in this case, as described above, there is provided a light-transmitting substrate 1 having a diameter of 120 mm. Still in this case, although the selection range of the thickness of the light-transmitting substrate 1 is as follows: as long as the change of the transmission coefficient and the reflection coefficient can be detected, but here, the thickness of the selected light-transmitting substrate 1 is 0.6 mm.

[0242] When ultraviolet rays...

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Abstract

Information is recorded on a light transmission material such as a light transmission substrate ( 1 ) or a light transmission protecting film as a change of refractive index or a change of extinction coefficient or a change of transmittance or a change of reflectance.

Description

technical field [0001] The present invention relates to a recording method, a recording and reproducing method, and a recording and reproducing apparatus, and more particularly, the present invention relates to a recording method, a recording and reproducing method, and a recording and reproducing apparatus, wherein the The above-mentioned recording and reproducing method generally involves one or both of a recording method and a reproducing method, and the recording and reproducing device generally involves a device that either has the function of a recording device, or has the function of a reproducing device, or It not only has the function of recording device, but also has the function of reproducing device. Background technique [0002] So far, as a rewritable high-density optical recording system, we know that there is a magneto-optical recording and reproducing system, the basic principle of which is to use the thermal energy of the laser beam, using a temperature exc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K19/06G06K17/00G11B5/00G11B7/004G11B7/0045G11B7/007G11B7/24G11B7/24047G11B7/24094G11B7/24097G11B7/26G11B11/105G11B13/00G11B13/04G11B20/00G11B23/28
CPCG11B20/00086G11B20/00746G11B13/04G11B20/00173G11B7/007G11B2005/0002G11B7/00455G11B7/24G11B11/10582G11B23/282G11B13/00G11B23/281G11B7/2533G11B7/004
Inventor 篠田昌孝
Owner SONY CORP
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