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公开(公告)号：SG68651A1
公开(公告)日：1999-11-16
申请号：SG1998000466
申请日：1998-03-02
Applicant: IBM
Inventor： BAUMGART PETER MICHAEL , BRANNON JAMES HAMMOND , BOON 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：AT185015T
公开(公告)日：1999-10-15
申请号：AT94308034
申请日：1994-11-01
Applicant: IBM
Inventor： BAUMGART PETER MICHAEL , LEUNG WING PUN , NGUYEN HUNG VIET , NGUYEN THAO ANH , TAM ANDREW CHING , WU ANTHONY
Abstract: A process is disclosed for creating an array of bumps to texture a brittle surface, such as a glass substrate 12 for data recording disks. The texturing process uses a laser 10 to provide pulses of proper energy fluence to the brittle glass surface to produce a plurality of raised bumps in the surface. The bump creation is accomplished without unwanted micro-cracking or ejection of surface material by limiting the laser pulse fluence to a value in a narrow operating region discovered below the abrupt thermal shock fluence threshold for the brittle surface material. The process is also applicable to other brittle surface textures, such as those intended for use as "stamping surfaces" for the contact reproduction of the negative of a surface pattern, such as an optical disk.
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13.发明专利
公开(公告)号：SG53101A1
公开(公告)日：1998-09-28
申请号：SG1997003715
申请日：1997-10-10
Applicant: IBM
Inventor： BARENBOIM MICHAEL , BAUMGART PETER MICHAEL , CHRUSCH PETER PAUL , HARPER BENNY MICHAEL , KARNI BENJAMIN , KERSTENS PIETER J M , LISANKE MICHAEL GERARD , LU HUIZONG , PENA LANPHUONG THI , SCHNETZER ERIC V , SEING HONG S , TAHERI ALI REZA , TAM ANDREW CHING
Abstract: A disk texturing process uses a single pulsed laser to texture disks within a first group, which are carried through the texturing process on a first spindle assembly, and from a second group, which are carried through the texturing process on a second spindle assembly. Preferably, disks from the first group are textured alternately with disks in the second group. A first level of least one texturing parameter is stored for use only as the process is applied to disks from the first group, while a second level of the same texturing parameter is stored for use only as the process is applied to disks from the second group. These levels may be derived from measurements of textured spots made with interferometric devices forming portions of a texturing station.
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公开(公告)号：DE69840285D1
公开(公告)日：2009-01-15
申请号：DE69840285
申请日：1998-02-23
Applicant: IBM
Inventor： BAUMGART PETER MICHAEL , BRANNON JAMES HAMMOND , POON CHIE CHING , TAM ANDREW CHING
Abstract: A multichannel acousto-optic modulator (MCAOM) uses a crystal (12) with a plurality of mounting faces for acoustic transducers (13a,13b). The mounting faces are oriented so that the acoustic transducers mounted thereon generate acoustic fields which intersect the incident laser beam at a common angle, i.e., the Bragg angle. A two channel MCAOM uses two transducers. Extension to any higher number of channels follows accordingly. Energising any of the transducers (13a,13b) causes a corresponding first order beam to be diffracted out. Since the acoustic field for each transducer intersects the incident beam with a unique orientation, each first order beam is diffracted out on a unique axis. A system utilising an MCAOM has electronic means for controlling the driving signals to the transducers to control each channel as required by the application. Amplitude and frequency modulation (26) of the driving signals (25) allows the intensity and angle of the beams to be controlled.
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公开(公告)号：DE69726361T2
公开(公告)日：2004-09-09
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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Patent Agency Ranking
公开(公告)号：IN190350B
公开(公告)日：2003-07-19
申请号：IN1345DE1994
申请日：1994-10-25
Applicant: IBM
Inventor： BAUMGART PETER MICHAEL , LEUNG WING PUN , NGUYEN HUNG VIET , NGUYEN THAO ANH , TAM ANDREW CHING , WU ANTHONY
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公开(公告)号：DE69806198T2
公开(公告)日：2003-01-30
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：SG53020A1
公开(公告)日：1998-09-28
申请号：SG1997002634
申请日：1997-07-25
Applicant: IBM
Inventor： BAREBOIM MICHAEL , BAUMGART PETER MICHAEL , CHRUSCH PETER PAUL , HARPER BENNY MICHAEL , KARNI BENJAMIN , KERSTENS PIETER J M , KRAJNOVICH DOUG JOHN , POUR IRAJ KAHKESH , SEING HONG S , TAM ADREW CHING
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：DE69316708D1
公开(公告)日：1998-03-05
申请号：DE69316708
申请日：1993-11-01
Applicant: IBM
Inventor： BAUMGART PETER MICHAEL , DIENY BERNARD , GURNEY BRUCE ALVIN , NOZIERES JEAN-PIERRE , SPERIOSU VIRGIL SIMON , WILHOIT DENNIS RICHARD
Abstract: A magnetoresistive read sensor 30 based on the spin valve effect incorporates a multilayered, dual spin valve structure. The sensor read element includes first 31, second 35 and third 39 layers of ferromagnetic material separated from each other by layers of non-magnetic metallic material. The first and third layers of ferromagnetic material, i.e., the outer layers of the structure, have their magnetization orientation fixed, while the second, intermediate ferromagnetic layer is magnetically soft and has its magnetization oriented perpendicular to that of both the outer ferromagnetic layers in the absence of an applied magnetic field. In one preferred embodiment, the two outer ferromagnetic layers have their magnetizations fixed parallel to each other by exchange coupling with adjacent antiferromagnetic layers. In a second preferred embodiment, the directions or magnetization in the first and third layers of ferromagnetic material are aligned in an antiparallel orientation.
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公开(公告)号：MY136486A
公开(公告)日：2008-10-31
申请号：MYPI9301481
申请日：1993-07-28
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 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 DISPOSITED 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 IN IRON OR AN IRON ALLOY.
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