Optical disk, an optical disk barcode forming method, an optical disk reproduction apparatus, a marking forming apparatus, a method of forming a laser marking on an optical disk, and a method of manufacturing an optical disk

• US 6,144,742 A
• Filed: 09/22/1999
• Issued: 11/07/2000
• Est. Priority Date: 05/16/1996
• Status: Expired due to Term

• Current Assignee: Mitsushita Electric Industrial Company Limited
• Original Assignee: Mitsushita Electric Industrial Company Limited
• Inventors: Tanaka, Shinichi, Oshima, Mitsuaki, Gotoh, Yoshiho, Koishi, Kenji, Moriya, Mitsuro
• Primary Examiner(s): OEN, WILLIAM L
• Application Number:
  US09/401,669
• Time in Patent Office: 412 Days
• Field of Search: 380/4, 380/21, 380/23, 307/10.2, 713/200, 340/825.31
• US Class Current: 369/53.21
• CPC Class Codes: G11B 20/00115 wherein the record carrier stores a unique medium identifier
• CPC Class Codes: G11B 20/00123 the record carrier being identified by recognising some of its unique characteristics, e.g. a unique defect pattern serving as a physical signature of the record carrier
• CPC Class Codes: G11B 20/0021 involving encryption or decryption of contents recorded on or reproduced from a record carrier
• CPC Class Codes: G11B 20/1217 on discs
• CPC Class Codes: G11B 20/1833 by adding special lists or symbols to the coded information G11B20/1806, G11B20/1866 take precedence
• CPC Class Codes: G11B 2020/122 Burst cutting area [BCA]
• CPC Class Codes: G11B 2020/1288 Formatting by padding empty spaces with dummy data, e.g. writing zeroes or random data when de-icing optical discs
• CPC Class Codes: G11B 2020/1836 using a Reed Solomon [RS] code
• CPC Class Codes: G11B 2220/237 having exactly two recording layers
• CPC Class Codes: G11B 2220/2537 Optical discs
• CPC Class Codes: H04L 2209/60 Digital content management, e.g. content distribution
• CPC Class Codes: H04L 9/32 including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials

Abstract

Disclosed is an optical disk barcode forming method wherein, as information to be barcoded, position information for piracy prevention, which is a form of ID, is coded as a barcode and is recorded by laser trimming on a reflective film in PCA area of an optical disk. When playing back the thus manufactured optical disk on a reproduction apparatus, the barcode data can be played back using the same optical pickup.

Claims

1. An optical disk in which mark array of sub information is recorded on such region where main information is not recorded, wherein

said mark has stripe-like configuration in a radius direction,

said sub information is divided into a plurality of frames each of which has a predetermined number of information words,

m(natural number) pieces of information symbols comprising at least one word of each said frame are added with n(natural number) pieces of dummy symbols to generate m+n pieces of information symbols,

i(natural number) pieces of parity symbols are generated for said information symbols having (m+n) pieces of symbols so as to generate code for error correction, and

said m pieces of information symbols and said parity symbols are recorded with using mark array.

2. An optical disk according to claim 1, wherein

optical reflection characteristics of said mark is different from that of such area neighboring on said mark.

3. An optical disk according to claim 1, wherein

Reed-Solomon correction method is used for said error correction.

4. An optical disk recording method for recording sub information as mark array on such region where main information is not recorded, said mark having stripe-like configuration in a radius direction, comprising

said sub information is divided into a plurality of frames each of which has a predetermined number of information words,

m(natural number) pieces of information symbols comprising at least one word of each said frame are added with n(natural number) pieces of dummy symbols to generate m+n pieces of information symbols,

i(natural number) pieces of parity symbols are generated for said information symbols having (m+n) pieces of symbols, and

said m pieces of information symbols and said parity symbols are recorded with using said mark array.

5. A reproducing apparatus for reproducing information on an optical disk, wherein

a sub information is recorded as mark array on such region where main information is not recorded, said mark having stripe-like configuration in a radius direction, and

there are at least two modes where a first mode is to decode code data for error correction with considering reproduced data of said mark array into which dummy symbols are inserted at a certain position, as error correction words and a second mode is to decode code data for error correction with considering data at a certain position of said reproduced data, as error correction words itself.

6. A reproducing apparatus according to claim 5, wherein

Reed-Solomon correction method is used for said error correction.

7. A reproducing apparatus according to claim 5, wherein 0 is inserted as said dummy symbols.