Optical disk, optical disk barcode forming method, 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 6,122,373 A
• Filed: 09/23/1999
• Issued: 09/19/2000
• Est. Priority Date: 10/09/1995
• Status: Expired due to Term

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Tanaka, Shinichi, Oshima, Mitsuaki, Gotoh, Yoshiho, Koishi, Kenji, Moriya, Mitsuro
• Primary Examiner(s): OEN, WILLIAM L
• Application Number:
  US09/404,506
• Time in Patent Office: 362 Days
• Field of Search: 380/3, 380/4, 380/21, 380/28, 380/30, 369/272, 369/275.1, 369/275.2, 369/275.3, 369/275.4, 369/275.5, 369/284, 369/286, 369/44.11, 369/93, 369/100, 235/454, 235/462, 235/482
• US Class Current: 705/52
• CPC Class Codes: G06K 1/126 by photographic or thermographic registration recording apparatus for measuring instruments G01D15/00
• CPC Class Codes: G06K 19/04 characterised by the shape
• CPC Class Codes: G06K 19/06018 one-dimensional coding
• CPC Class Codes: G06K 19/06028 using bar codes
• CPC Class Codes: G06K 19/08 using markings of different kinds or more than one marking of the same kind in the same record carrier, e.g. one marking being sensed by optical and the other by magnetic means
• CPC Class Codes: G06K 19/14 the marking being sensed by radiation
• CPC Class Codes: G06K 2019/06243 concentric-code
• CPC Class Codes: G06K 2019/06271 Relief-type marking
• CPC Class Codes: G11B 13/04 magnetically or by magnetisation and optically or by radiation, for changing or sensing optical properties
• CPC Class Codes: G11B 13/045 combined recording by magnetic and optic means
• CPC Class Codes: G11B 19/04 Arrangements for preventing, inhibiting, or warning against double recording on the same blank or against other recording or reproducing malfunctions
• CPC Class Codes: G11B 19/12 by sensing distinguishing features of or on records, e.g. diameter end mark
• CPC Class Codes: G11B 19/122 involving the detection of an identification or authentication mark record carriers indicating unauthorised or prior use G11B23/28
• CPC Class Codes: G11B 20/00086 Circuits for prevention of unauthorised reproduction or copying, e.g. piracy indicating unauthorised use of record carriers in general G11B23/28; scrambling for television signal recording H04N5/913; network architectures or network protocols for network security H04L63/00; cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
• CPC Class Codes: G11B 20/00094 involving measures which result in a restriction to authorised record carriers
• 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 20/00137 involving measures which result in a restriction to contents recorded on or reproduced from a record carrier to authorised users
• CPC Class Codes: G11B 20/00144 involving a user identifier, e.g. a unique customer ID
• CPC Class Codes: G11B 20/00152 involving a password
• CPC Class Codes: G11B 20/0021 : involving encryption or decryption of contents recorded on or reproduced from a record carrier
• CPC Class Codes: G11B 20/0026 : the key being stored as a barcode
• CPC Class Codes: G11B 20/00268 : said barcode being recorded in a burst cutting area [BCA]
• CPC Class Codes: G11B 20/00326 : the key being embossed on the record carrier
• CPC Class Codes: G11B 20/00347 : wherein the medium identifier is used as a key
• CPC Class Codes: G11B 20/00384 : the key being derived from a physical signature of the record carrier, e.g. unique feature set
• CPC Class Codes: G11B 20/00492 : wherein content or user data is encrypted
• CPC Class Codes: G11B 20/00528 : wherein each title is encrypted with a separate encryption key for each title, e.g. title key for movie, song or data file
• CPC Class Codes: G11B 20/00543 : wherein external data is encrypted, e.g. for secure communication with an external device or for encrypting content on a separate record carrier
• CPC Class Codes: G11B 20/00557 : wherein further management data is encrypted, e.g. sector headers, TOC or the lead-in or lead-out areas
• CPC Class Codes: G11B 20/00586 : said format change concerning the physical format of the recording medium
• CPC Class Codes: G11B 20/0071 : involving a purchase action
• CPC Class Codes: G11B 20/0084 : wherein the usage restriction can be expressed as a specific time or date
• CPC Class Codes: G11B 20/00855 : involving a step of exchanging information with a remote server
• CPC Class Codes: G11B 20/00876 : wherein physical copy protection means are attached to the medium, e.g. holograms, sensors, or additional semiconductor circuitry
• CPC Class Codes: G11B 20/0092 : involving measures which are linked to media defects or read/write errors
• CPC Class Codes: G11B 20/10 : Digital recording or reproducing
• CPC Class Codes: G11B 20/1217 : on discs
• CPC Class Codes: G11B 20/1252 : for discontinuous data, e.g. digital information signals, computer programme data
• CPC Class Codes: G11B 20/1403 : characterised by the use of two levels
• CPC Class Codes: G11B 20/1419 : to or from biphase level coding, i.e. to or from codes where a one is coded as a transition from a high to a low level during the middle of a bit cell and a zero is encoded as a transition from a low to a high level during the middle of a bit cell or vice versa, e.g. split phase code, Manchester code conversion to or from biphase space or mark coding, i.e. to or from codes where there is a transition at the beginning of every bit cell and a one has no second transition and a zero has a second transition one half of a bit period later or vice versa, e.g. double frequency code, FM code
• CPC Class Codes: G11B 20/1426 : conversion to or from block codes or representations thereof
• 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 2007/0013 : for carriers having multiple discrete layers
• CPC Class Codes: G11B 2020/122 : Burst cutting area [BCA]
• CPC Class Codes: G11B 2020/1259 : with ROM/RAM areas
• CPC Class Codes: G11B 2220/213 : Read-only discs
• CPC Class Codes: G11B 2220/2545 : CDs
• CPC Class Codes: G11B 2220/2562 : DVDs [digital versatile discs]; Digital video discs; MMCDs; HDCDs
• CPC Class Codes: G11B 2220/61 : wherein solid state memory is used for storing A/V content storing computer data in solid state memories G06F
• CPC Class Codes: G11B 23/0042 : with provision for auxiliary features sensing such features G11B17/00, G11B19/02
• CPC Class Codes: G11B 23/281 : by changing the physical properties of the record carrier
• CPC Class Codes: G11B 23/283 : Security features, e.g. digital codes
• CPC Class Codes: G11B 23/284 : on the record carrier
• CPC Class Codes: G11B 23/30 : with provision for auxiliary signals
• CPC Class Codes: G11B 23/34 : Signal means additional to the main recording track, e.g. photoelectric sensing of sprocket holes for timing
• CPC Class Codes: G11B 23/38 : Visual features other than those contained in record tracks or represented by sprocket holes the visual signals being auxiliary signals
• CPC Class Codes: G11B 27/24 : by sensing features on the record carrier other than the transducing track ; sensing signals or marks recorded by another method than the main recording
• CPC Class Codes: G11B 5/86 : Re-recording, i.e. transcribing information from one magnetisable record carrier on to one or more similar or dissimilar record carriers by varying the order of the information G11B27/029, G11B27/036
• CPC Class Codes: G11B 7/0037 : with discs
• CPC Class Codes: G11B 7/005 : Reproducing G11B7/0065 takes precedence
• CPC Class Codes: G11B 7/0053 : Reproducing non-user data, e.g. wobbled address, prepits, BCA
• CPC Class Codes: G11B 7/007 : Arrangement of the information on the record carrier, e.g. form of tracks , actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
• CPC Class Codes: G11B 7/00736 : Auxiliary data, e.g. lead-in, lead-out, Power Calibration Area [PCA], Burst Cutting Area [BCA], control information sector headers or adresses in prepits G11B7/00745; address data in track wobble G11B7/24082
• CPC Class Codes: G11B 7/24038 : Multiple laminated recording layers
• CPC Class Codes: G11B 7/26 : Apparatus or processes specially adapted for the manufacture of record carriers
• CPC Class Codes: G11B 7/268 : Post-production operations, e.g. initialising phase-change recording layers, checking for defects investigating the presence of flaws or contamination in optical discs G01N21/9506

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 a 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. A reproducing apparatus for reproducing information on an optical disk where a first signal is recorded by a bit pattern with a first recording clock T1 and a second signal is recorded with overlapping state on said first signal with a second recording clock T2 (≧

14T1), comprising high frequency suppressing means for suppressing a high frequency signal which is higher than a predetermined frequency, and wherein

said second signal is extracted from a reproduced information by suppressing said first signal by using said high frequency suppressing means.

2. A reproducing apparatus according to claim 1, wherein

said high frequency suppressing means is a low pass filter.

3. An optical disk reproducing apparatus wherein recorded contents of a recording area on which a main information recorded by forming pits on an optical disk are reproduced by an optical head with using rotational phase control for a motor, while recorded contents of a different recording area other than said recording area, on which sub information is recorded by selectively forming low-reflectivity marks are reproduced by an optical head using rotational speed control for said motor and thereby

the main information recorded on said recording area and the sub information recorded on said different recording area are both reproduced by using the same optical pickup.

4. An optical disk reproducing apparatus according to claim 3, wherein tracking control is not performed in said different recording area.

5. An optical disk reproducing apparatus according to claim 3 wherein tracking control is performed in said recording area.

6. An optical disk reproducing apparatus according to claim 5, wherein said rotational speed is the rotational speed that would be achieved in said different recording area if said rotational phase control were applied.

7. An optical disk reproducing apparatus according to claim 3, wherein the rotational speed of said motor in said rotational speed control is maintained at a prescribed value based on a result obtained by measuring a minimum-length pit in said different recording area.

8. An optical disk reproducing apparatus according to claim 3, wherein said marks are a barcode-like pattern formed on a circle of a predetermined radius.

9. An optical disk reproducing apparatus according to claim 3, wherein

said marks are a barcode-like pattern, and said different recording area is recorded with pits, and

when reproducing the recorded contents of said different recording area, a high-frequency-component signal generated during reproduction of said pits on said different recording area is reduced or eliminated by a low-pass filter thereby making it possible to separate a signal which is reproduced from said barcode.

10. An optical disk reproducing apparatus according to claim 3, wherein

said marks are a barcode-like pattern and when reproducing the recorded contents of said different recording area, the width of a signal obtained by reading said barcode is increased to a prescribed width and then measured with sampling pulses from a control section.

11. An optical disk reproducing apparatus according to any one of claims 3 to 10, wherein said optical disk is constructed from two disk-substrates laminated together.

12. An optical disk reproducing apparatus according to claim 3, wherein said optical disk includes a control data area for holding therein physical feature information concerning said optical disk, and an identifier for indicating the presence or absence of said barcode is recorded in said control data area.

13. An optical disk reproducing apparatus according to claim 12, wherein, after reading recorded contents of said control data area and judging the presence or absence of said barcode, it is determined whether an optical pickup should be moved to an inner portion or an outer portion of said optical disk.