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公开(公告)号：JPH10241155A
公开(公告)日：1998-09-11
申请号：JP2465098
申请日：1998-02-05
Applicant: IBM
Inventor： THOMAS ROBERT ALBRECH , BAUMGART PETER MICHAEL , TAO AN GUEN , KIRT ALLEN RUBIN , TAM ANDREW C
IPC: G11B5/00 , G11B5/012 , G11B5/016 , G11B5/09 , G11B5/65 , G11B5/73 , G11B5/738 , G11B5/82 , G11B5/84 , G11B11/10 , G11B13/00 , G11B20/10 , G11B27/11 , G11B27/24
Abstract: PROBLEM TO BE SOLVED: To utilize information such as manufacturer, batch number, date of manufacture, serial number, etc., for fault analysis by storing information as a series of non-magnetic marks written by the laser to a disk surface, using such information as the encoded identification information and then reading such ID information. SOLUTION: The CSS area 113 is formed in the spiral shape with many bumps to have a landing zone of 3mm width. To encode the magnetic disk information in the CSS area 113, the laser bump in the CSS area 113 is encoded. The identification information is encoded in the CSS area 113 by changing little the interval of the laser bumps. Since bump interval is used for encoding, the apparatus can be simplified. Influence on friction is minimized by keeping constant the bump density within the CSS area 113. Since many bumps are provided in the cover area of the slider 120, laser bump enables encoding of the identifier without giving bad influence on the performance of texturing of area.
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公开(公告)号：JPH10275357A
公开(公告)日：1998-10-13
申请号：JP7405698
申请日：1998-03-23
Applicant: IBM
Inventor： BAUMGART PETER MICHAEL , BRANNON JAMES HAMMOND , POON CHIE CHING , TAM ANDREW C
Abstract: PROBLEM TO BE SOLVED: To provide a multichannel acoustooptical modulator(MCAOM) using a crystal having plural mounting surfaces for an acoustic modulator and to provide a laser device utilizing the MCAOM. SOLUTION: Mounting surfaces 12b, 12d are oriented so that acoustic modulators (13a, 13b) mounted on them so as to generate sound fields 41, 42 intersecting an incident beam 16 at a common angle that is a Bragg's angle α. The MCAOM of two channels use two modulators 13a, 13b. Channels are increased in this manner. A corresponding 1-st order beam 16 is diffracted by activating the modulators 13a, 13b. Since the sound fields of respective modulators 13a, 13b intersect the incident laser beam 16 with intrinsic directions, the 1-st order beam is diffracted (14a, 14b) in respective intrinsic aces. A device utilizing the MCAOM controls respective channels in accordance with purposes by controlling driving signals to the modulators with an electronic means. Intensities and directions of the beams re controlled by amplitudes of the driving signals and modulations of frequencies.
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公开(公告)号：JPH10275341A
公开(公告)日：1998-10-13
申请号：JP7425498
申请日：1998-03-23
Applicant: IBM
Inventor： BAUMGART PETER MICHAEL , BRANNON JAMES HAMMOND , POON CHIE CHING , POUR IRAJ KAKESH , TAM ANDREW C
Abstract: PROBLEM TO BE SOLVED: To provide a laser device capable of directing diffracted beams generated from initial laser beam and having high equality toward both surfaces of a substrate simultaneously. SOLUTION: Diffracted beams are generated with energies sufficient to form texture bumps to be used on the substrate of a magnetic disk 95 by softening spots being on surfaces of the substrate. The beams are generated by a multichannel acoustic optical modulator (MCAOM) which has at least two channels (here, two channel modulator (DCAOM)). The crystal of the MCAOM has at least two mounting surfaces oriented so as to intersect an incident laser beam 16 at a common angle, that is, a Bragg angle (α). A corresponding 1-st order beam 16 is diffracted (14a, 14b) by activating arbitrary modulators 13a, 13b. The diffracted beams are preferably generated by generating two beams whose pulse intensities exceed 50% of the incident beam and which can be directed toward counter surfaces of the substrate in order to uniformize textures extremely while alternating driving signals to the modulators.
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公开(公告)号：JPH10116422A
公开(公告)日：1998-05-06
申请号：JP21458297
申请日：1997-08-08
Applicant: IBM
Inventor： BARENBOIM MICHAEL , BAUMGART PETER MICHAEL , CHRUSCH PETER B , HARPER BENNY MICHAEL , KARNI BENJAMIN , KERSTENS PIETER J M , KRAJNOVICH DOUG JOHN , POUR IRAJ KAHKESH , SEING HONG S , TAM ANDREW C
Abstract: PROBLEM TO BE SOLVED: To provide a disk texture tool for giving a texture spot by irradiating annular parts on both sides of a hard file disk with a laser beam. SOLUTION: A disk is moved while being housed in a cassette and subjected to the texture process through two disk processing stations. An optical system introduces a laser beam 131 to a beam splitter 132 and the laser beam is divided into two beams. Two beams have approximately equal power, travel toward a power control optical block along a parallel paths and both surfaces of the disk to be given by the texture are irradiated with the beams through the block. The power control optical block 136 has an attenuating/measuring means of two beams, respectively. A mirror moving left and right alternately sends two beams to the two disk processing stations.
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公开(公告)号：JPH1027340A
公开(公告)日：1998-01-27
申请号：JP5461797
申请日：1997-03-10
Applicant: IBM
Inventor： BARENBOIM MICHAEL , BAUMGART PETER MICHAEL , CHRUSCH PETER PAUL , KARNI BENJAMIN , KERSTENS PIETER J M , THAO ANH NGUYEN , SEING HONG S , ANDREW CHING TAM
Abstract: PROBLEM TO BE SOLVED: To provide a device for forming a disk having a surface roughened by pulse laser exposure. SOLUTION: The disk 49 in a cassette 48 is roughened through disk processing stations 38, 39. A lifter 59 lifts up each disk form the cassette, and transfers it to a pick-and-place mechanism 71 to be moved to a spindle 86. The spindle is rotated, and the disk is advanced side by side, and its both sides are exposed to beams led out from a pulse laser 108. Then, the pick-and-place mechanism returns the disk to the lifter, and lowers the disk to an original cassette pocket. While the pick-and-place mechanism of one side disk processing station moves the disk, the disk in the spindle of another disk processing station is exposed to the laser beam.
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Patent Agency Ranking
公开(公告)号：DE69806198D1
公开(公告)日：2002-08-01
申请号：DE69806198
申请日：1998-03-09
Applicant: IBM
Inventor： BAUMGART PETER MICHAEL , BRANNON JAMES HAMMOND , POON CHIE CHING , POUR IRAJ KAKESH , TAM ANDREW CHING
Abstract: A laser system concurrently directs highly equivalent diffracted beams (14a,14b) derived from an initial laser beam (16) to both sides of a substrate. The diffracted beams are generated with sufficient energy to soften spots on the surfaces of a substrate (95) to form texture bumps as are used on substrates for magnetic disks. The diffracted beams are generated by a multichannel acousto-optic modulator (MCAOM) having at least two channels. The crystal (12) in the MCAOM has at least two mounting faces oriented so that the acoustic transducers (13a,13b) mounted thereon generate acoustic fields which intersect the incident laser beam at a common angle. i.e.. the Bragg angle. Energising any of the transducers causes a corresponding first order beam to be diffracted out. Preferably the diffracted beams are generated by alternating driving signals to transducers to produce two beams with pulse intensity greater than 50% of that of the incident beam which can be directed to opposite sides of the substrate (95) for extremely uniform texturing.
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公开(公告)号：DE69726361D1
公开(公告)日：2004-01-08
申请号：DE69726361
申请日：1997-09-01
Applicant: IBM
Inventor： BARENBOIM MICHAEL , BAUMGART PETER MICHAEL , CHRUSCH PETER B , HARPER BENNY MICHAEL , KARNI BENJAMIN , KERSTENS PIETER J M , KRAJNOVICH DOUG JOHN , POUR IRAJ KAHKESH , SEING HONG S , TAM ANDREW C
Abstract: A disk texturing tool is used, for example, to provide textured spots in an annular portion of both sides of a hardfile disk. Disks are moved into and out of the texturing process in cassettes, through two disk-handling stations. An optical system includes a laser directed at a beamsplitter to split the laser beam into two beams having approximately power, which are directed along parallel paths through a power control optics block to expose simultaneously opposite sides of a disk to be textured. The power control optics block includes means for attenuating and measuring each of the two beams. A shuttling mirror directs these two beams alternately at a disk within each of the two disk handling stations.
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公开(公告)号：SG53024A1
公开(公告)日：1998-09-28
申请号：SG1997002725
申请日：1997-07-31
Applicant: IBM
Inventor： BARENBOIM MICHAEL , BAUMGART PETER MICHAEL , CHRUSCH PETER PAUL , HARPER BENNY MICHAEL , KARNI BENJAMIN , KERSTENS PIETER J M , SEING HONG S , TAM ANDREW CHING
Abstract: A disk texturing tool is used, for example, to provide textured spots in an annular portion of both sides of a disk for a hard disk drive. Disks are moved into and out of the texturing process in cassettes, through two disk-handling stations. An optical system includes a laser directed at a beamsplitter to split the laser beam into two beams having approximately power, which are directed along parallel paths through a power control optics block to expose simultaneously opposite sides of a disk to be textured. The power level of each of these two beams is controlled by a program which operates in a teach mode to develop a look up table describing laser beam power as a function of a signal driving an attenuator, in a set point mode setting this drive signal to provide a certain laser beam power, in a run mode controlling this power through a feedback loop, and in a display mode showing laser beam power as a function of time.
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公开(公告)号：SG44357A1
公开(公告)日：1997-12-19
申请号：SG1995002207
申请日：1993-08-12
Applicant: IBM
Inventor： BAUMGART PETER MICHAEL , DIENY BERNARD , GURNEY BRUCE ALVIN , SPERIOSU VIRGIL SIMON , WILHOIT DENNIS RICHARD
Abstract: A magnetoresistive read sensor based on the spin valve effect in which a component of the read element resistance varies as the cosine of the angle between the magnetization directions in two adjacent magnetic layers is described. The sensor read element includes two adjacent ferromagnetic layers separated by a nonmagnetic metallic layer. A layer of antiferromagnetic material is formed over one of the ferromagnetic layers to provide an exchange bias field which fixes or "pins" the magnetization direction in the one ferromagnetic layer. An interlayer of magnetically soft material is deposited between the ferromagnetic and antiferromagnetic layers separating the ferromagnetic layer from the antiferromagnetic layer and enhancing the exchange coupling, particularly in the instance where the ferromagnetic material is iron or an iron alloy.
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公开(公告)号：MY116946A
公开(公告)日：2004-04-30
申请号：MYPI9703518
申请日：1997-08-01
Applicant: IBM
Inventor： BARENBOIM MICHAEL , BAUMGART PETER MICHAEL , CHRUSCH PETER B , HARPER BENNY MICHAEL , KARNI BENJAMIN , KERSTENS PIETER J M , SEING HONG S , TAM ANDREW CHING
Abstract: A DISK TEXTURING TOOL (37) IS USED, FOR EXAMPLE, TO PROVIDE TEXTURED SPOTS IN AN ANNULAR PORTION OF BOTH SIDES OF A DISK (49, 182) FOR A HARD DISK DRIVE. DISKS ARE MOVED INTO AND OUT OF THE TEXTURING PROCESS IN CASSETTES (48,56,58, 166), THROUGH TWO DISK-HANDLING STATIONS (38, 39). AN OPTICAL SYSTEM INCLUDES A LASER (108) DIRECTED AT A BEAMSPLITTER (132) TO SPLIT THE LASER BEAM INTO TWO BEAMS HAVING APPROXIMATELY POWER, WHICH ARE DIRECTED ALONG PARALLEL PATHS THROUGH A POWER CONTROL OPTICS BLOCK (136) TO EXPOSE SIMULTANEOUSLY OPPOSITE SIDES OF A DISK TO BE TEXTURED. THE POWER LEVEL OF EACH OF THESE TWO BEAMS IS CONTROLLED BY A PROGRAM WHICH OPERATES IN A TEACH MODE TO DEVELOP A LOOK UP TABLE DESCRIBING LASER BEAM POWER AS A FUNCTION OF A SIGNAL DRIVING AN ATTENUATOR, IN A SET POINT MODE SETTING THIS DRIVE SIGNAL TO PROVIDE A CERTAIN LASER BEAM POWER, IN A RUN MODE CONTROLLING THIS POWER THROUGH A FEEDBACK LOOP, AND IN A DISPLAY MODE SHOWING LASER BEAM POWER AS A FUNCTION OF TIME.
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