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Recording medium, and playback apparatus and method, production apparatus and method and recording apparatus, for same

a technology which is applied in the field of recording medium and playback device and method, production apparatus and method and recording device, for the same, can solve the problems of insufficient copyright protection of digital data and insufficient payment of copyrighters for digital data, and achieve the effect of superior quality

Inactive Publication Date: 2010-06-17
KONDO TETABUJIRO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The enhanced quality of read information requires multiple recording media for complete reproduction, effectively preventing illegal copying and ensuring copyright holders receive payment for their work.

Problems solved by technology

However, if data can be copied as above without any degradation in value and quality, the copyright for the digital data will not possibly be protected adequately.
If the digital data copied without permission of the copyrighter is the same in value and quality as the original digital data, however, a person going to use the digital data will not use a low-price recording medium having the digital data copied thereto without buying the regular recording medium at the regular price including the royalty.
Thus, the copyrighter for the digital data will not be paid appropriately for a number of persons actually having the digital data as well as for a number of times the digital data has been used.

Method used

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  • Recording medium, and playback apparatus and method, production apparatus and method and recording apparatus, for same
  • Recording medium, and playback apparatus and method, production apparatus and method and recording apparatus, for same
  • Recording medium, and playback apparatus and method, production apparatus and method and recording apparatus, for same

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0152 of the Disk-Shaped Recording Medium

[0153]In this embodiment of the present invention, the disk-shaped recording medium is formed as an optical disk having a single recording layer. As shown in FIG. 5, the disk-shaped recording medium 1 as an optical disk has a recording layer having basic data recorded as pits 6 therein. The basic data is recorded as digital data. When demodulated, the basic data becomes basic information such as video information as in the foregoing. When irradiated with a focused laser beam L from the optical pickup head, the pits 6 scatters the leader beam L. The optical pickup head detects a reflected light from the disk-shaped recording medium 1 to check whether the reflected light contains any signals. The height of the pits 6 is a quarter of the wavelength of the laser beam L irradiated from the optical pickup head.

[0154]In the disk-shaped recording medium 1 formed as an optical disk, a step-like portion 7 is formed in a part of each pit 6 to record add...

second embodiment

[0160 of the Disk-Shaped Recording Medium

[0161]Also, the disk-shaped recording medium 1 according to the present invention may be formed as a so-called two-layer disk including two similar recording layers 8 and 9 as shown in FIG. 6. In this case, at least the first and second recording layers 8 and 9 are stacked one on the other.

[0162]To record the additional data as the step-like portions, the step-like portion is formed in a part of each pit in the first and second recording layers 8 and 9. From such step-like portions, there is read the additional data as a reflected light of the laser beam focused in a position between the first and second recording layers 8 and 9. To focus the laser beam between the first and second recording layers 8 and 9, an astigmatism has only to be caused by the optical pickup head 25 in the playback apparatus which will further be described later to take place in the reflected light of the laser beam from the disk-shaped recording medium 1 as shown in F...

third embodiment

[0163 of the Disk-Shaped Recording Medium

[0164]Also, the disk-shaped recording medium according to the present invention may be formed as a two-layer disk including a first recording layer 18 formed on a disk substrate 17 and where basic data is recorded as pits, and a second recording layer 19 formed in a stacked relation on the first recording layer 18 and where additional data is recorded as a change in transmittance of the second recording layer 19, as shown in FIG. 8.

[0165]Basic data is recorded as pits in the first recording layer 18. From this first recording layer 18, there is read the basic data as a change in light amount of a reflected light of a laser beam irradiated from the optical pickup head.

[0166]In case the pits are formed in the first recording layer 18, the light amount of the reflected light of the laser beam irradiated from the optical pickup head is nearly zero. Such basic data is defined as “0” (or “1”) herein. In case no pits are formed in the first recordin...

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Abstract

In a recording medium (1), read information is calculated with additional information as a coefficient and superior in quality to basic information. Namely, the read information contains a larger amount of information than the basic information. So, even if it is tried to record the read information as it is to any other recording medium, the recording medium should be a one having a sufficiently large capacity for storage of the read information. Thus, copy of recorded data in the recording medium (1) to any other recording medium is highly difficult.

Description

TECHNICAL FIELD[0001]The present invention relates to a recording medium for recording various kinds of information signals such as video signals, music signals, etc., and a playback apparatus and method, production apparatus and method, and a recording apparatus, for the recording medium.[0002]This application claims the priority of the Japanese Patent Application Nos. 2002-064576, 2002-064577, 2002-064578, 2002-064579 and 2002-064580, all filed on Mar. 8, 2002, the entirety of which is incorporated by reference herein.BACKGROUND ART[0003]Heretofore, there have been proposed various types of recording media for recording various kinds of information signals such as video signals, music signals, computer programs or the like. Such recording media are used in the form of a so-called magnetic disk, optical disk or semiconductor memory. Also, information signals to be recorded to these recording medium are digital and analog.[0004]For example, an optical disk having digital data record...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G11B7/24H04N5/00G11B7/013G11B7/24085G11B20/00G11B20/10H04N5/926H04N5/945H04N9/79
CPCG11B7/013G11B7/24085G11B20/00086H04N9/7925H04N5/926H04N5/945G11B20/10G11B7/09G11B7/0045G11B7/007
Inventor KONDO, TETSUJIRO
Owner KONDO TETABUJIRO