Optical disk including a barcode pattern formed by a laser using pulse width modulation
First Claim
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1. A marking forming apparatus comprising:
- marking forming means for applying at least one marking to at least one reflective film formed to a disk;
marking position detecting means for detecting at least one position of said marking; and
position information output means for outputting said detected position as position information of said marking.
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Abstract
An object of the present invention is to provide a marking forming apparatus, a method of forming a laser marking on an optical disk, a reproduction apparatus, an optical disk, and a method of manufacturing an optical disk, capable of providing a greatly improved copy prevention capability as compared to prior known construction. To achieve this object, in the optical disk of the invention, for example, a marking is formed by a laser on a reflective film of a disk holding data written thereon and at least position information of the marking or information concerning the position information is written on the disk in an encrypted form or with a digital signature appended thereto.
22 Citations
35 Claims
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1. A marking forming apparatus comprising:
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marking forming means for applying at least one marking to at least one reflective film formed to a disk; marking position detecting means for detecting at least one position of said marking; and position information output means for outputting said detected position as position information of said marking. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 27)
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12. A method of forming a laser marking to an optical disk, comprising the steps of:
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forming at least one disk; forming a reflective film to said formed disk; laminating two disks together, said disks including at least one disk with said reflective film formed thereon; and forming at least one marking by a laser on said reflective layer of the laminated disks.
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13. A reproduction apparatus comprising:
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position information reading means for reading position information of it least one marking or information concerning said position information, said marking being formed to at least one reflective film formed to a disk and being detected for a position thereof, at least the position thus detected being output as said position information of said marking; marking reading means for reading information concerning at least one actual position of said marking; comparing/judging means for performing comparison and judgement by using a result of reading by said position information reading means and a result of reading by said marking reading means; and reproducing means for reproducing recorded data on said optical disk in accordance with a result of the comparison and judgement performed by said comparing/judging means. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method of manufacturing an optical disk, comprising the steps of:
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forming at least one disk; forming a reflective film to said formed disk; applying at least one marking to said reflective film; detecting at least one position of said marking; and outputting said detected position as position information of said marking, and encrypting said information for writing to said disk.
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24. A method of manufacturing an optical disk, comprising the steps of:
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forming at least one disk; forming a reflective film to said formed disk; applying at least one marking to said reflective film; detecting at least one position of said marking; and outputting said detected position as position information of said marking, and applying a digital signature in relation to said position information for writing to said disk.
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25. An optical disk wherein at least one marking is formed by a laser to at least one reflective film of the disk holding data written thereon and at least position information of said marking or information concerning said position information is written to said disk in an encrypted form or with a digital signature applied thereto.
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26. An optical disk having a structure such that at least one reflective film is one of sandwiched directly and sandwiched indirectly between two members formed from material resistant to laser light,
wherein at least one marking is formed by a laser to said reflective film.
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28. An optical disk comprising:
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a data zone for recording information readable by light radiation; a track formed on the optical disk; a barcode pattern formed by a laser on the optical disk using a 4-value pulse width modulation; and the data zone and a part of the barcode pattern are formed on the track. - View Dependent Claims (29)
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30. A method of manufacturing an optical disk comprising the steps of:
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forming a data zone for recording information readable by light radiation; forming a track on the optical disk; forming a barcode pattern by a laser on the optical disk using a 4-value pulse width modulation; and forming the data zone and a part of the barcode pattern on the track. - View Dependent Claims (31)
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32. A method of reproducing data on an optical disk comprising the steps of:
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forming a track on the optical disk; forming a data zone and part of a barcode pattern on the track; reading information recorded on an information recording layer of the optical disk, and reading data recorded as the barcode pattern formed on the optical disk using a 4-value pulse width demodulation. - View Dependent Claims (33)
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34. A reproduction apparatus for reproducing data on an optical disk comprising:
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a track formed on the optical disk; a data zone and a part of a barcode pattern formed on the track; a pick-up device for reading information recorded on an information recording layer of the optical disk, and a reading device for reading data recorded as the barcode pattern formed on the optical disk using a 4-value pulse width demodulation. - View Dependent Claims (35)
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Specification