Source: http://www.google.com/patents/US7355805?dq=4484186
Timestamp: 2014-10-23 10:23:49
Document Index: 654723587

Matched Legal Cases: ['art 32', 'art 33', 'art 32', 'art 33', 'art 32', 'art 32', 'art 33', 'art 33']

Patent US7355805 - Magnetic tape and method of manufacturing magnetic tape, servo writer, and ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsData for specifying servo bands SB1 to SB5 is embedded in each servo signal S1 to S5 that is written on a plurality of servo bands SB1 to SB5 formed on a magnetic tape MT....http://www.google.com/patents/US7355805?utm_source=gb-gplus-sharePatent US7355805 - Magnetic tape and method of manufacturing magnetic tape, servo writer, and method of and apparatus for specifying servo bandAdvanced Patent SearchPublication numberUS7355805 B2Publication typeGrantApplication numberUS 10/823,675Publication dateApr 8, 2008Filing dateApr 14, 2004Priority dateApr 15, 2003Fee statusPaidAlso published asUS20040207943Publication number10823675, 823675, US 7355805 B2, US 7355805B2, US-B2-7355805, US7355805 B2, US7355805B2InventorsToru Nakao, Takahisa IzumidaOriginal AssigneeFujifilm CorporationExport CitationBiBTeX, EndNote, RefManPatent Citations (19), Referenced by (5), Classifications (22), Legal Events (3) External Links: USPTO, USPTO Assignment, EspacenetMagnetic tape and method of manufacturing magnetic tape, servo writer, and method of and apparatus for specifying servo bandUS 7355805 B2Abstract Data for specifying servo bands SB1 to SB5 is embedded in each servo signal S1 to S5 that is written on a plurality of servo bands SB1 to SB5 formed on a magnetic tape MT.
BACKGROUND OF THE INVENTION The present invention relates to a magnetic tape, method of manufacturing the magnetic tape, servo writer, and method of and apparatus for specifying a servo band, which contribute to specify a servo band formed on a magnetic tape.
SUMMARY OF THE INVENTION According to the present invention, there is provided a magnetic tape comprising: a plurality of servo bands on which are written servo signals for tracking control of a magnetic head, wherein data is embedded in a servo signal written on one of the servo bands, and the data is for specifying the servo band where the servo signal positions.
DETAILED DESCRIPTION OF THE INVENTION With reference to the accompanying drawings, a magnetic tape, and method of manufacturing the magnetic tape, a servo writer, method of and apparatus for specifying a servo band where a servo signal positions, and method of embedding data according to the present invention will be described in detail. With reference to FIGS. 1 and 2, description will be given firstly for servo signals S1 to S5 which are written on a magnetic tape MT
As described above, the first subframes 11, 21 of the first servo pattern 1 and the second servo pattern 2 are formed differently so that the data indicating �1� is embedded in the first servo pattern 1 and the data indicating �0� is embedded in the second servo pattern 2. With arbitrary arrangement of these first and second servo patterns 1, 2 along the longitudinal direction of the tape, it is possible to read out a predetermined data, upon reading out, for example, the whole servo signal S1.
As one example of data structure embedded in the whole servo signal S1, the data structure on the basis of �ECMA-319 standard� will be described with reference to FIG. 3. Since the servo signals S2 to S5 have substantially the same data structure as the servo signal S1, detailed description thereof will be omitted.
As shown in FIG. 4, by reading the 97 longitudinal direction positional information LW the manufacturer data Tx is recognized as one manufacturer information MI. The manufacturer data Tx is constructed by writing on the head of the manufacturer data Tx the data indicating the head position (e.g. 4 bit data to become �0001� is converted by a certain table to indicate the data of �D�), and by writing on the following 96 manufacturer data Tx arbitrary data other than the �D� (e.g. 0, 1, . . . , 9, A, B, C). Embedded in the 96 manufacturer data Tx are data such as a manufacturer ID, a manufacturing data information of the tape, a serial number of the tape, a servo writer ID, and an operator ID, and servo band information indicating any one of the five servo bands SB1 to SB5.
As shown in FIG. 7, the recording/reproducing apparatus 3 mainly includes a head unit 31, a data decoding part 32 as a servo band specifying part, and a servo band specifying part 33. The head unit 31 mainly includes a plurality of heads 31 a for recording/reproducing data on the data bands DB1 to DB4, a servo read head 31 b for reading the servo signals S1 to S5 (FIG. 1) written on the servo bands SB1 to SB5, and a reserve servo read head 31 c. The servo read head 31 b mainly reads out a pulse signal of the servo signals S1 to S5 written on the servo bands SB to SB5. The reserve servo read head 31 c is used, for example, when the servo read head 31 b malfunctions or temporarily or permanently jams. The reserve servo read head 31 c also functions to read the servo signals S1 to S5 likewise the servo read head 31 b. The data decoding part 32 decodes one servo signal that is read out by the servo read head 31 b or the reserve servo read head 31 c, such as data (encoded for specifying the servo bands SB1 to SB5) embedded in the servo signal S1. The servo band specifying part 33 specifies the servo bands SB1 to SB5 based on a signal outputted from the data decoding part 32.
As seen in FIG. 7, when the servo read head 31 b positions on the servo band SB1, the whole servo signal S1 written on the servo band SB1 is read out by the servo read head 31 b. The thus read out servo signal S1 is outputted to the data decoding part 32 and decoded. During the decoding process, only the data indicating the servo band information is extracted from the 96 manufacturer data Tx and decoded. For example, two data �0� �0� are extracted from a predetermined position in the 96 manufacturer data Tx, and the data are converted (decoded) by a certain table to produce the data of �A�.
When the servo band information as the decoded data is outputted to the servo band specifying part 33, the servo band specifying part 33 specifies the servo band SB1 where the servo signal S1 positions. Other servo bands SB2 to SB4 are also specified based on the data read out by the servo read head 31 b. In the case of a malfunction of the servo read head 31 b, each of the servo bands SB2 to SB5 are specified based on the data read out by the reserve servo read head 31 c. According to the aforementioned embodiments of the present invention, because data indicating the respective servo bands SB1 to SB5 are embedded in the corresponding servo signals S1 to S5 written on a plurality of servo bands SB1 to SB5, it is possible to specify the servo band without comparing the servo signals written on the adjacent servo bands. Further, because the servo band can be specified from one servo signal, even if one servo read head 31 b malfunctions, another reserve servo read head 31 c can specify, for example, the servo band SB2, to thereby reliably determine that the head unit 31 positions on the data band DB4.
Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS5353176 *Dec 4, 1992Oct 4, 1994Hitachi, Ltd.Method of reproducing magnetic recording data and a magnetic storage system using switching between plural heads provided to a trackUS5689384 *Jun 30, 1994Nov 18, 1997International Business Machines CorporationTiming based servo system for magnetic tape systemsUS5898533 *Feb 21, 1997Apr 27, 1999Storage Technology CorporationTape servo pattern with embedded servo track number identificationUS5930065May 16, 1997Jul 27, 1999International Business Machines CorporationTiming based servo longitudinal addressingUS5946156 *Mar 4, 1997Aug 31, 1999Imation Corp.Tape servo system and methods, write/read heads, and servo track configurations regarding sameUS5963400 *Feb 21, 1997Oct 5, 1999Storage Technology CorporationThin film tape head including split top poleUS5982711 *Jun 5, 1997Nov 9, 1999Hewlett-Packard Co.Device for reading data from or writing data to magnetic storage media and a method of positioning a tape head relative to the magnetic storage mediaUS6031673 *Mar 4, 1998Feb 29, 2000Hewlett-Packard CompanyServo band verification in linear tape systems having timing-based servo formatsUS6122124 *Oct 20, 1998Sep 19, 2000Hewlett-Packard Co.Servo system and method with digitally controlled oscillatorUS6124996 *Oct 20, 1998Sep 26, 2000Hewlett-Packard Co.Servo system and method with multiple phase clockUS6169640 *Mar 4, 1998Jan 2, 2001Hewlett-Packard Co.Servo band identification in linear tape systems having timing based servo formatsUS6330123 *May 19, 2000Dec 11, 2001Imation Corp.Head assembly having a single pass servo writerUS6433949 *Jul 7, 2000Aug 13, 2002Design & Test Technology, Inc.Servo write headUS6563659 *Mar 8, 2000May 13, 2003Hewlett-Packard Development Company, L.P.Method and apparatus for servo code based tape tension measurementUS6580581 *Aug 16, 2000Jun 17, 2003International Business Machines CorporationRecovery of lateral position of a servo system with respect to longitudinal servo bands of a magnetic tapeUS6710967 *Dec 28, 2001Mar 23, 2004Storage Technology CorporationHigh frequency and low frequency servo patternUS6791781 *Jul 17, 2001Sep 14, 2004International Business Machines CorporationMethod and apparatus for providing linear position (LPOS) estimationsUS6937413 *Aug 8, 2003Aug 30, 2005International Business Machines CorporationTape servo information with superimposed data information providing servo band identificationUS6940682 *Sep 10, 2003Sep 6, 2005International Business Machines CorporationData read transducers for determining lateral position of a tape head with respect to longitudinal servo bands of magnetic tape* Cited by examinerReferenced byCiting PatentFiling datePublication dateApplicantTitleUS7898763 *Jan 13, 2009Mar 1, 2011International Business Machines CorporationServo pattern architecture to uncouple position error determination from linear position informationUS8446686 *Sep 30, 2009May 21, 2013Kabushiki Kaisha ToshibaInformation storage apparatus, servo pattern formation control apparatus, and recording mediumUS8611039Apr 29, 2009Dec 17, 2013Hewlett-Packard Development Company, L.P.Arrangement and processing of longitudinal position information on a data storage mediumUS20100123972 *Sep 30, 2009May 20, 2010Fujitsu LimitedInformation storage apparatus, servo pattern formation control apparatus, and recording mediumWO2010126494A1 *Apr 29, 2009Nov 4, 2010Hewlett-Packard Development Company, L.P.Arrangement and processing of longitudinal position information on a data storage medium* Cited by examinerClassifications U.S. Classification360/48, G9B/5.291, 360/55, G9B/5.203, G9B/5.005, G9B/27.043, 360/77.12International ClassificationG11B27/32, G11B5/584, G11B5/78, G11B5/008, G11B5/02, G11B5/09Cooperative ClassificationG11B5/584, G11B2220/90, G11B5/78, G11B5/00813, G11B27/322European ClassificationG11B5/584, G11B5/78, G11B27/32B, G11B5/008TLegal EventsDateCodeEventDescriptionSep 7, 2011FPAYFee paymentYear of fee payment: 4Feb 15, 2007ASAssignmentOwner name: FUJIFILM CORPORATION, JAPANFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:FUJIFILM HOLDINGS CORPORATION (FORMERLY FUJI PHOTO FILM CO., LTD.);REEL/FRAME:018904/0001Effective date: 20070130Owner name: FUJIFILM CORPORATION,JAPANFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:FUJIFILM HOLDINGS CORPORATION (FORMERLY FUJI PHOTO FILM CO., LTD.);US-ASSIGNMENT DATABASE UPDATED:20100203;REEL/FRAME:18904/1Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:FUJIFILM HOLDINGS CORPORATION (FORMERLY FUJI PHOTO FILM CO., LTD.);US-ASSIGNMENT DATABASE UPDATED:20100209;REEL/FRAME:18904/1Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:FUJIFILM HOLDINGS CORPORATION (FORMERLY FUJI PHOTO FILM CO., LTD.);US-ASSIGNMENT DATABASE UPDATED:20100211;REEL/FRAME:18904/1Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:FUJIFILM HOLDINGS CORPORATION (FORMERLY FUJI PHOTO FILM CO., LTD.);US-ASSIGNMENT DATABASE UPDATED:20100216;REEL/FRAME:18904/1Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:FUJIFILM HOLDINGS CORPORATION (FORMERLY FUJI PHOTO FILM CO., LTD.);US-ASSIGNMENT DATABASE UPDATED:20100223;REEL/FRAME:18904/1Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:FUJIFILM HOLDINGS CORPORATION (FORMERLY FUJI PHOTO FILM CO., LTD.);US-ASSIGNMENT DATABASE UPDATED:20100302;REEL/FRAME:18904/1Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:FUJIFILM HOLDINGS CORPORATION (FORMERLY FUJI PHOTO FILM CO., LTD.);US-ASSIGNMENT DATABASE UPDATED:20100309;REEL/FRAME:18904/1Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:FUJIFILM HOLDINGS CORPORATION (FORMERLY FUJI PHOTO FILM CO., LTD.);US-ASSIGNMENT DATABASE UPDATED:20100316;REEL/FRAME:18904/1Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:FUJIFILM HOLDINGS CORPORATION (FORMERLY FUJI PHOTO FILM CO., LTD.);US-ASSIGNMENT DATABASE UPDATED:20100323;REEL/FRAME:18904/1Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:FUJIFILM HOLDINGS CORPORATION (FORMERLY FUJI PHOTO FILM CO., LTD.);US-ASSIGNMENT DATABASE UPDATED:20100330;REEL/FRAME:18904/1Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:FUJIFILM HOLDINGS CORPORATION (FORMERLY FUJI PHOTO FILM CO., LTD.);US-ASSIGNMENT DATABASE UPDATED:20100406;REEL/FRAME:18904/1Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:FUJIFILM HOLDINGS CORPORATION (FORMERLY FUJI PHOTO FILM CO., LTD.);US-ASSIGNMENT DATABASE UPDATED:20100413;REEL/FRAME:18904/1Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:FUJIFILM HOLDINGS CORPORATION (FORMERLY FUJI PHOTO FILM CO., LTD.);US-ASSIGNMENT DATABASE UPDATED:20100420;REEL/FRAME:18904/1Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:FUJIFILM HOLDINGS CORPORATION (FORMERLY FUJI PHOTO FILM CO., LTD.);US-ASSIGNMENT DATABASE UPDATED:20100427;REEL/FRAME:18904/1Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:FUJIFILM HOLDINGS CORPORATION (FORMERLY FUJI PHOTO FILM CO., LTD.);US-ASSIGNMENT DATABASE UPDATED:20100504;REEL/FRAME:18904/1Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:FUJIFILM HOLDINGS CORPORATION (FORMERLY FUJI PHOTO FILM CO., LTD.);US-ASSIGNMENT DATABASE UPDATED:20100511;REEL/FRAME:18904/1Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:FUJIFILM HOLDINGS CORPORATION (FORMERLY FUJI PHOTO FILM CO., LTD.);US-ASSIGNMENT DATABASE UPDATED:20100518;REEL/FRAME:18904/1Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:FUJIFILM HOLDINGS CORPORATION (FORMERLY FUJI PHOTO FILM CO., LTD.);US-ASSIGNMENT DATABASE UPDATED:20100525;REEL/FRAME:18904/1Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:FUJIFILM HOLDINGS CORPORATION (FORMERLY FUJI PHOTO FILM CO., LTD.);REEL/FRAME:18904/1Apr 14, 2004ASAssignmentOwner name: FUJI PHOTO FILM CO. LTD., JAPANFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:NOKAO, TORU;IZUMIDA, TAKAHISA;REEL/FRAME:015205/0635Effective date: 20040304RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services©2012 Google