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公开(公告)号：JP2003141716A
公开(公告)日：2003-05-16
申请号：JP2002329594
申请日：2002-11-13
Applicant: IBM
Inventor： BARENBOIM MICHAEL , PETER MICHAEL BAUMGARDT , PETER B CRUSCH , HAPER BENNY MICHAEL , BENJAMIN KARUNI , PETER J M KERSTENS , SEING HONG S , TAM ANDREW CHING
Abstract: PROBLEM TO BE SOLVED: To provide a computer readable storage medium on which a computer program is recorded for making a computer carry out the control of the power of a laser beam used in texturing a disk. SOLUTION: An optical system for providing textured spots in an annular portion of the disk includes a laser directed at a beamsplitter to split the laser beam into two beams having approximately power. The two beams are directed along parallel paths through a power control optics block to expose simultaneously both sides of the 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 look up table describing laser beam power as a function of a signal driving an attenuator, in a set point mode setting this driving 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：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：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：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：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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Patent Agency Ranking
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：DE3582100D1
公开(公告)日：1991-04-18
申请号：DE3582100
申请日：1985-08-28
Applicant: IBM
Inventor： IMAINO WAYNE ISAMI , TAM ANDREW CHING
Abstract: 57 A method and device for detecting a narrow acoustic spectral feature in a sample as described. The method uses an electrical frequency modulated (FM) signal that is obtained from a voltage controlled oscillator 58. The Fourier spectrum of this wave is a main frequency f c with two small sidebands at frequencies f c ±f s . This whole triplet is slowly swept in frequency by a slow sawtooth generator 52. The electrical signal is fed into a flat acoustic transducer 64; the acoustic wave is then transmitted through an acoustically active medium 66, i.e. the sample, and detected by another flat acoustic transducer 70 which produces an FM signal with a superposed amplitude modulated (AM) signal if one of the sideboards overlaps an acoustic feature. This electrical signal is then demodulated to give a pure AM signal which can be phase sensitive detected by using a lock-in amplifier 78. By suitable adjustment of the phase setting of the lock-in amplifier both the "in-phase" and "out-of-phase" signals of the detected acoustic signal can be detected.
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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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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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