Source: http://www.google.com/patents/US7050386?dq=7,194,691
Timestamp: 2016-10-29 00:43:37
Document Index: 770785287

Matched Legal Cases: ['art 601', 'art 601', 'art 601', 'art 601', 'art 602', 'art 602', 'art 902', 'art 901', 'art 901', 'art 503', 'art 2002', 'art 2002']

Patent US7050386 - Optical recording medium and misalignment measuring instrument - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsTo provide an optical recording medium and an eccentricity amount detecting device using the same that can detect an eccentricity amount representing a relative displacement amount in a radiation direction between a beam spot irradiated onto the optical recording medium and the optical recording medium....http://www.google.com/patents/US7050386?utm_source=gb-gplus-sharePatent US7050386 - Optical recording medium and misalignment measuring instrumentAdvanced Patent SearchTry the new Google Patents, with machine-classified Google Scholar results, and Japanese and South Korean patents.Publication numberUS7050386 B2Publication typeGrantApplication numberUS 10/333,059PCT numberPCT/JP2001/007443Publication dateMay 23, 2006Filing dateAug 29, 2001Priority dateAug 31, 2000Fee statusLapsedAlso published asCN1222937C, CN1449560A, EP1315155A1, EP1315155A4, US20040100887, WO2002019323A1Publication number10333059, 333059, PCT/2001/7443, PCT/JP/1/007443, PCT/JP/1/07443, PCT/JP/2001/007443, PCT/JP/2001/07443, PCT/JP1/007443, PCT/JP1/07443, PCT/JP1007443, PCT/JP107443, PCT/JP2001/007443, PCT/JP2001/07443, PCT/JP2001007443, PCT/JP200107443, US 7050386 B2, US 7050386B2, US-B2-7050386, US7050386 B2, US7050386B2InventorsEiji UedaOriginal AssigneeMatsushita Electric Industrial Co., Ltd.Export CitationBiBTeX, EndNote, RefManPatent Citations (12), Referenced by (3), Classifications (28), Legal Events (5) External Links: USPTO, USPTO Assignment, EspacenetOptical recording medium and misalignment measuring instrument
US 7050386 B2Abstract
To provide an optical recording medium and an eccentricity amount detecting device using the same that can detect an eccentricity amount representing a relative displacement amount in a radiation direction between a beam spot irradiated onto the optical recording medium and the optical recording medium. In the optical recording medium, a plurality (N) of servo areas (113) each including a first wobble mark (211) and a second wobble mark (212) and a plurality (N) of data areas for performing information recording and reproduction are arranged alternatively in a circumferential direction. Each of the servo areas is composed of a plurality of servo pattern areas (210 a to 210 c) arranged in the radial direction, which vary in a distance in the circumferential direction between the first wobble mark and the second wobble mark. The plurality of servo pattern areas include the same number of tracks, and the number is less than N/(2�π).
The present invention relates to an optical recording medium with respect to which data recording/reproduction is performed using light, and an eccentricity amount detecting device using the optical recording medium.
In recent years, optical recording media have been put to wide and practical use in the forms of, for example, a CD and a DVD, as media for storing music and images. For further expansion of the field of application, such optical media have been undergoing improvements in capacity and performance.
JP 63(1988)-225924 A discloses an optical disk as a measure to solve the above-mentioned problem. That is, “the optical disk is characterized in that a distance between at least one pit of a pair of wobble pits and a clock pit as a reference pit to information data varies between at least three predetermined distances, and the distance is changed in a predetermined order repeatedly for every at least one information track”, thereby allowing the above-mentioned problem to be solved.
With the foregoing in mind, it is an object of the present invention to provide an information recording medium and an eccentricity amount detecting device that enables accurate detection of an eccentricity amount representing a relative movement amount in a radial direction between a beam spot irradiated onto the optical recording medium and the optical recording medium.
FIG. 1 is a schematic plan view showing an example of a configuration of an optical recording medium according to Embodiment 1 of the present invention.
In Embodiment 1, the description is directed to an example of an optical recording medium according to the present invention.
In Embodiment 2, the description is directed to an example of an eccentricity amount detecting device using the above-described optical recording medium according to Embodiment 1.
As shown in FIG. 6, the reproduction signal DRF from the detecting circuit 501 is input to each of a first wobble mark position detecting part 601 a and a second wobble mark position detecting part 601 b. In the first wobble mark position detecting part 601 a, it is judged whether the distance in the circumferential direction between the clock mark 202 and the first wobble mark 203 is either of L1 a and L1 b or either of L1 c and L1 d as shown in FIG. 2. When the distance in the circumferential direction between the clock mark 202 and the first wobble mark 203 is either of L1 c and L1 d, a first wobble mark position detection signal WBL1 that is to be of an “H” level (“H” indicates the high potential level) is output. On the other hand, when the distance in the circumferential direction between the clock mark 202 and the first wobble mark 203 is either of L1 a and L1 b, a first wobble mark position detection signal WBL1 that is to be of an “L” level (“L” indicates the low potential level) is output.
Similarly, in the second wobble mark position detecting part 601 b, it is judged whether the distance in the circumferential direction between the clock mark 202 and the second wobble mark 204 is either of L2 a and L2 d or either of L2 b and L2 c. When the distance in the circumferential direction between the clock mark 202 and the second wobble mark 204 is either of L2 b and L2 c, a second wobble mark position detection signal WBL2 that is to be of the “H” level (“H” indicates the high potential level) is output. On the other hand, when the distance in the circumferential direction between the clock mark 202 and the second wobble mark 204 is either of L2 a and L2 d, a second wobble mark position detection signal WBL2 that is to be of the “L” level (“L” indicates the low potential level) is output.
In the direction judging part 602, when the beam spot moves in the outer circumferential direction on the optical recording medium 101, that is, when the first wobble mark position detection signal WBL1 has a waveform having a phase lag of 90 degrees with respect to the second wobble mark position detection signal WBL2, a signal with the “L” level is output as the direction detection signal DIR.
Furthermore, when the beam spot moves in the inner circumferential direction on the optical recording medium 101, the direction judging part 602 outputs a signal with the “H” level as the direction detection signal DIR.
In a counting part 902 shown in FIG. 9, a first wobble mark position detection signal WBL91 output from the first wobble mark position detecting part 901 a, a second wobble mark position detection signal WBL92 output from the second wobble mark position detecting part 901 b, and the direction detection signal DIR output from the direction detecting part 503 are input, and thus a count signal CNT is output. Specifically, with respect to the number of changes of the first wobble mark position detection signal WBL91 and the number of changes of the second wobble mark position detection signal WBL92, addition and subtraction are performed according to a state of the direction detection signal DIR, and thus a result thus obtained is output as the count signal CNT. More specifically, when the direction detection signal DIR is of the “H” level (when a beam spot on the optical recording medium 101 is moving to an outer circumference), an adding operation is performed; when the direction detection signal DIR is of the “L” level (when the beam spot on the optical recording medium 101 is moving to an inner circumference), a subtracting operation is performed.
In Embodiment 3, the description is directed to another example of the optical recording medium according to the present invention.
In Embodiment 4, the description is directed to an example of an eccentricity amount detecting device using the above-mentioned optical recording medium 110 according to Embodiment 3.
FIG. 20 is a timing chart showing changes over time of the content of the pattern judgment signal PTN when a beam spot moves in an outer circumferential direction on the optical recording medium 110. In FIG. 20, when the pattern judgment signal PTN has a content indicated by Pattern_a, the type of the servo pattern area is of the first servo pattern area 210 a. Further, when the pattern judgment signal PTN has a content indicated by Pattern_b, the type of the servo pattern area is of the second servo pattern area 210 b. Furthermore, when the pattern judgment signal PTN has a content indicated by Pattern_c, the type of the servo pattern area is of the third servo pattern area 210 c. In FIG. 20, since the beam spot moves in the outer circumferential direction on the optical recording medium 110, the content of the pattern judgement signal PTN varies from Pattern_a to Pattern_b, further from Pattern_b to Pattern_c, and still further from Pattern_c to Pattern_a. The direction determining circuit 616 shown in FIG. 19 detects these changes, namely the change from Pattern_a to Pattern_b, the change from Pattern_b to Pattern_c, and the change from Pattern_c to Pattern_a, and outputs a signal with a logical level of “H” as the direction detection signal DIR.
In FIG. 21, since the beam spot moves in the inner circumferential direction on the optical recording medium 110, the content of the pattern judgment signal PTN varies from Pattern_a to Pattern_c, further from Pattern_c to Pattern_b, and still further from Pattern_b to Pattern_a. The direction determining circuit 616 shown in FIG. 19 detects these changes, namely the change from Pattern_a to Pattern_c, the change from Pattern_c to Pattern_b, and the change from Pattern_b to Pattern_a, and outputs a signal with a logical level of “L” as the direction detection signal DIR.
Specifically, when the direction detection signal DIR has a content of a logical level of “H”, the counting part 2002 counts the number of changes in the content of the servo pattern judgment signal PTR by addition. On the other hand, when the direction detection signal DIR has a content of a logical level “L”, the counting part 2002 counts the number of changes in the content of the servo pattern judgment signal PTR by subtraction.
Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS4707816 *Dec 8, 1986Nov 17, 1987Hitachi, Ltd.Method and apparatus for composite wobbled and push-pull tracking servo systemUS4866688 *Dec 17, 1986Sep 12, 1989Hitachi, Ltd.Composite tracking servo system for optical disc apparatus with track offset correctionUS5063546Mar 11, 1988Nov 5, 1991Mitsubishi Denki Kabushiki KaishaOptic disc with servo pattern and apparatus for accessing the optical discUS5459710 *Nov 8, 1994Oct 17, 1995Hitachi, Ltd.Apparatus for recording information in data sections having number of bytes which increases with increase in circumference of tracks on mediumUS5815485 *Aug 27, 1996Sep 29, 1998Matsushita Electric Industrial Co., Ltd.Recording medium, a method for producing the same, a control method using the recording medium, and a recording/reproducing apparatus using the recording mediumUS5859820 *Mar 19, 1997Jan 12, 1999Mitsubishi Denki Kabushiki KaishaOptical disk drive and optical disk having a continuous information track formed of alternating land and groove revolutionsUS6118752 *Jul 2, 1996Sep 12, 2000Matsushita Electric Industrial Co., Ltd.Optical information recording medium offset pre-pit array indicating identification informationUS6128272 *Sep 9, 1999Oct 3, 2000Sony CorporationRecording mediumUS6628578 *Jan 27, 2000Sep 30, 2003Matsushita Electric Industrial Co., Ltd.Disklike storage medium and tracking method using the sameJPH01223634A Title not availableJPS63225924A Title not availableJPS63281006A Title not available* Cited by examinerReferenced byCiting PatentFiling datePublication dateApplicantTitleUS7167436 *May 14, 2003Jan 23, 2007Canon Kabushiki KaishaOptical recording medium having servo area and groove sectionUS20030214901 *May 14, 2003Nov 20, 2003Canon Kabushiki KaishaOptical recording medium having servo area and groove sectionUS20060120264 *Oct 20, 2003Jun 8, 2006Sony CorporationDisk substrate and optical disk* Cited by examinerClassifications U.S. Classification369/275.4, 369/44.26, G9B/7.034, G9B/7.029, 369/53.23, 369/275.3, G9B/7.088, G9B/7.064, G9B/7.039International ClassificationG11B7/095, G11B7/09, G11B7/013, G11B7/00, G11B7/007, G11B7/085Cooperative ClassificationG11B7/0953, G11B7/0901, G11B7/08517, G11B7/0938, G11B7/24085, G11B7/007, G11B7/00745, G11B7/00European ClassificationG11B7/24085, G11B7/007S, G11B7/09F, G11B7/007, G11B7/095ELegal EventsDateCodeEventDescriptionJan 14, 2003ASAssignmentOwner name: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD., JAPANFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:UEDA, EIJI;REEL/FRAME:014353/0150Effective date: 20021206Oct 21, 2009FPAYFee paymentYear of fee payment: 4Jan 3, 2014REMIMaintenance fee reminder mailedMay 23, 2014LAPSLapse for failure to pay maintenance feesJul 15, 2014FPExpired due to failure to pay maintenance feeEffective date: 20140523RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services