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21.发明专利
公开(公告)号：MY115556A
公开(公告)日：2003-07-31
申请号：MYPI9704768
申请日：1997-10-10
Applicant: IBM
Inventor： BARENBOIM MICHAEL , SCHNETZER ERIC V , SEING HONG S , TAHERI ALI REZA , TAM ANDREW CHING , BAUMGART PETER MICHAEL , CHRUSCH PETER P , HARPER BENNY MICHAEL , KARNI BENJAMIN , KERSTENS PIETER J M , LISANKE MICHAEL GERARD , LU HUIZONG , PENA LANPHUONG THI
Abstract: A DISK TEXTURING PROCESS USES A SINGLE PULSED LASER (129) TO TEXTURE DISKS (128, 128b) WITHIN A FIRST GROUP, WHICH ARE CARRIED THROUGH THE TEXTURING PROCESS ON A FIRST SPINDLE ASSEMBLY (128A), AND FROM A SECOND GROUP, WHICH ARE CARRIED THROUGH THE TEXTURING PROCESS ON A SECOND ASSEMBLY (128C). 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 DISK 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 (126, 126A) FORMING PORTIONS OF A TEXTURING STATION.
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公开(公告)号：SG77155A1
公开(公告)日：2000-12-19
申请号：SG1998000080
申请日：1998-01-10
Applicant: IBM
Inventor： ALBRECHT THOMAS ROBERT , BAUMGART PETER MICHAEL , NGUYEN THAO ANH , RUBIN KURT ALLAN , TAM ANDREW CHING
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: A magnetic disk with nonmagnetic information encoded under, in or above the magnetic layer of the disk is described along with the disk drive using the magnetic disks. The information may be stored as a series of laser-written marks (e.g., bumps, oxidized spots or spots with altered reflectivity) upon the surface(s) of each disk of the disk stack. The set of marks may be a series of laser bumps which serve a dual purpose as a landing zone or contact start/stop (CSS) zone for the slider and as encoded identifying information. During the manufacturing process for disk drives containing the disks, each disk's identifier can be read using outboard equipment such as an HRF tester or by means contained in the drive itself. Each disk identifier can then be stored magnetically in a special region of the hard disk reserved for use by the drive and/or within the flash memory of the hard drive. The drive can then communicate the identifier(s) to a host computer using the conventional communication hardware and firmware. In this way selected information such as the origin, batch number, date of manufacture, serial number, etc. of any disk can be obtained when needed as, for example, as part of failure analysis.
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公开(公告)号：DE69420812T2
公开(公告)日：2000-04-27
申请号：DE69420812
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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公开(公告)号：SG70627A1
公开(公告)日：2000-02-22
申请号：SG1998000453
申请日：1998-02-27
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：DE69420812D1
公开(公告)日：1999-10-28
申请号：DE69420812
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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Patent Agency Ranking
公开(公告)号：DE69317178T2
公开(公告)日：1998-10-29
申请号：DE69317178
申请日：1993-08-12
Applicant: IBM
Inventor： BAUMGART PETER MICHAEL , DIENY BERNARD , GURNEY BRUCE ALVIN , SPERIOSU VIRGIL SIMON , WILHOIT DENIS 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：DE69316708T2
公开(公告)日：1998-08-06
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：DE69317178D1
公开(公告)日：1998-04-09
申请号：DE69317178
申请日：1993-08-12
Applicant: IBM
Inventor： BAUMGART PETER MICHAEL , DIENY BERNARD , GURNEY BRUCE ALVIN , SPERIOSU VIRGIL SIMON , WILHOIT DENIS 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：SG46768A1
公开(公告)日：1998-02-20
申请号：SG1997000255
申请日：1997-02-05
Applicant: IBM
Inventor： BARENBOIM MICHAEL , BAUMGART PETER MICHAEL , CHRUSCH PETER PAUL , KARNI BENJAMIN , KERSTENS PIETER J M , NGUYEN THAO ANH , 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 hardfile disk. Disks are moved into and out of the texturing process in cassettes, through two disk-handling stations. In each disk-handling station, a lifter raises each individual disk from the cassette. The individual disk is then transferred to a pick-and-place mechanism, which moves it to a spindle. The spindle spins and translates the disk, so that both sides of the disk are exposed to beams derived from a pulsed laser. The pick-and-place mechanism then returns the disk to the lifter, which lowers it into the cassette pocket from which it was taken. The pick-and-place mechanism simultaneously moves one disk from the lifter to the spindle and another from the spindle to the lifter. While disks are moved by the pick-and-place mechanism of one disk-handling station, a disk in the spindle of the other disk-handling station is exposed to the laser beams.
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公开(公告)号：SG44398A1
公开(公告)日：1997-12-19
申请号：SG1996000145
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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