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公开(公告)号：JPH07326142A
公开(公告)日：1995-12-12
申请号：JP9926995
申请日：1995-04-25
Applicant: IBM
Inventor： BEST JOHN STEWART , CHIANG WEN-WEI , HETZLER STEVEN ROBERT , HORNE DONALD EDWARD , LEE CHIH-KUNG , MARRELLO VINCENT
Abstract: PURPOSE: To obtain a non-invasion type servo write system for use in a data recording disk drive. CONSTITUTION: The system measures a position of an actuator and generates a reference clock with use of a semiconductor laser 200. An internal position reference is given by an arm of the actuator and by a reflection diffraction grading mounted on a spindle hub. A wave front reproducing optical system corrects an aberration in the grating. An optical sensor detects a differential change in a diffracted pattern generated by the grating and excludes a sensitivity to frequency drift. A decoder circuit converts data of the optical sensor to an actuator position measured value. A control circuit drives a voice coil motor 118 within the disk drive and a motor positions a write transducer to record servo information to be provided within a servo pattern generator. A servo write device writes the data into the fully-assembled, closed drive through a transmission window in a cover of a head disk assembly.
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公开(公告)号：JP2001043643A
公开(公告)日：2001-02-16
申请号：JP2000190872
申请日：2000-06-26
Applicant: IBM
Inventor： BEST JOHN STEWART , CHIANG WEN-WEI , HETZLER STEVEN ROBERT , HORNE DONALD EDWARD , LEE CHIH-KUNG , MARRELLO VINCENT
Abstract: PROBLEM TO BE SOLVED: To provide a non-entrance type servo writing system which is to be used in a data recording disk drive. SOLUTION: A system measures the position of an actuator and generates a reference clock by using a semiconductor laser 200. The reference of the internal position is provided by reflection diffraction gratings mounted on an actuator arm and a spindle hub. A wave front reproducing optical system corrects aberration in the gratings. Moreover, optical sensors detect change of difference of a diffraction pattern to be generated by the gratings to exclude sensitivity with respect to a frequency drift. A decoding circuit converts data of the optical sensors into the measurement value of the position of the actuator. A control circuit drives a voice coil motor 118 in the disk drive and the motor positions a write-in transducer in order to record servo information to be provided in a servo pattern generator. Then, a servo writing device performs a writing to the drive which is completely assembled and is hermetically sealed through a transmission window in a head and disk assembly cover.
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公开(公告)号：DE69505524T2
公开(公告)日：1999-06-02
申请号：DE69505524
申请日：1995-05-18
Applicant: IBM
Inventor： BEST JOHN STEWART , CHIANG WEN-WEI , HETZLER STEVEN ROBERT , HORNE DONALD EDWARD , LEE CHIH-KUNG , MARRELLO VINCENT
Abstract: A non-invasive servo-write system for use in a data recording disk drive. The system measures actuator position and generates a reference clock using semiconductor lasers. Internal position references are provided by reflective diffraction gratings affixed to the actuator arm and the spindle hub. Wavefront reconstruction optics correct for aberrations in the gratings. Optical sensors detect differential changes in the diffraction patterns created by the gratings, eliminating sensitivity to frequency drift. Decode electronics convert optical sensor data into an actuator position measurement. Control electronics drive the voice coil motor within the disk drive, which positions the write transducer to record servo information provided in a servo pattern generator. Transparent windows in the head-disk-assembly cover allow the servo-writer to write drives which are completely assembled and sealed.
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公开(公告)号：IN190181B
公开(公告)日：2003-06-28
申请号：IN363DE1995
申请日：1995-03-06
Applicant: IBM
Inventor： BEST JOHN STEWART , CHIANG WEN-WEI , HETZLER STEVEN ROBERT , HORNE DONALD EDWARD , LEE CHIH-KUNG , MARRELLO VINCENT
IPC: G06K19/00
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公开(公告)号：DE69505524D1
公开(公告)日：1998-11-26
申请号：DE69505524
申请日：1995-05-18
Applicant: IBM
Inventor： BEST JOHN STEWART , CHIANG WEN-WEI , HETZLER STEVEN ROBERT , HORNE DONALD EDWARD , LEE CHIH-KUNG , MARRELLO VINCENT
Abstract: A non-invasive servo-write system for use in a data recording disk drive. The system measures actuator position and generates a reference clock using semiconductor lasers. Internal position references are provided by reflective diffraction gratings affixed to the actuator arm and the spindle hub. Wavefront reconstruction optics correct for aberrations in the gratings. Optical sensors detect differential changes in the diffraction patterns created by the gratings, eliminating sensitivity to frequency drift. Decode electronics convert optical sensor data into an actuator position measurement. Control electronics drive the voice coil motor within the disk drive, which positions the write transducer to record servo information provided in a servo pattern generator. Transparent windows in the head-disk-assembly cover allow the servo-writer to write drives which are completely assembled and sealed.
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Patent Agency Ranking
公开(公告)号：AT172571T
公开(公告)日：1998-11-15
申请号：AT95920835
申请日：1995-05-18
Applicant: IBM
Inventor： BEST JOHN STEWART , CHIANG WEN-WEI , HETZLER STEVEN ROBERT , HORNE DONALD EDWARD , LEE CHIH-KUNG , MARRELLO VINCENT
Abstract: A non-invasive servo-write system for use in a data recording disk drive. The system measures actuator position and generates a reference clock using semiconductor lasers. Internal position references are provided by reflective diffraction gratings affixed to the actuator arm and the spindle hub. Wavefront reconstruction optics correct for aberrations in the gratings. Optical sensors detect differential changes in the diffraction patterns created by the gratings, eliminating sensitivity to frequency drift. Decode electronics convert optical sensor data into an actuator position measurement. Control electronics drive the voice coil motor within the disk drive, which positions the write transducer to record servo information provided in a servo pattern generator. Transparent windows in the head-disk-assembly cover allow the servo-writer to write drives which are completely assembled and sealed.
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公开(公告)号：AU5459480A
公开(公告)日：1980-09-11
申请号：AU5459480
申请日：1980-01-14
Applicant: IBM
Inventor： MARRELLO VINCENT , ONTON AARE , RUHLE WOLFGANG
Abstract: A method of operating an alternating current (AC) excited thin film electroluminensence (ACTEL) device which improves the memory effect and brightness thereof is described. A typical ACTEL device has a thin luminescent layer made of ZnS thin film doped with Mn which is sandwiched between two dielectric layers. ACTEL devices exhibit a brightness versus voltage amplitude hysteresis loop which is commonly referred to as the memory effect. The application of a hybrid AC excitation waveform to the ACTEL device such as that shown in the Figure provides increased brightness and improved memory effect stability. The hybrid waveform has an initial portion 12A that is sufficiently high for efficient carrier generation and a remaining waveform portion 14A that is at a lower level than the initial portion for charge collection and holding purposes.
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公开(公告)号：SG30328A1
公开(公告)日：1996-06-01
申请号：SG1995000171
申请日：1995-03-27
Applicant: IBM
Inventor： LEE CHIH-KUNG , HORNE DONALD EDWARD , BEST JOHN STEWART , HETZLER STEVEN ROBERT , MARRELLO VINCENT , CHIANG WEN-WEI
IPC: G11B21/02
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公开(公告)号：BR9502512A
公开(公告)日：1996-04-09
申请号：BR9502512
申请日：1995-05-23
Applicant: IBM
Inventor： BEST JOHN STEWART , CHIANG WEN-WEI , HETZLER STEVEN ROBERT , HORNE DONALD EDWARD , LEE CHIH-KUNG , MARRELLO VINCENT
Abstract: A non-invasive servo-write system for use in a data recording disk drive. The system measures actuator position and generates a reference clock using semiconductor lasers. Internal position references are provided by reflective diffraction gratings affixed to the actuator arm and the spindle hub. Wavefront reconstruction optics correct for aberrations in the gratings. Optical sensors detect differential changes in the diffraction patterns created by the gratings, eliminating sensitivity to frequency drift. Decode electronics convert optical sensor data into an actuator position measurement. Control electronics drive the voice coil motor within the disk drive, which positions the write transducer to record servo information provided in a servo pattern generator. Transparent windows in the head-disk-assembly cover allow the servo-writer to write drives which are completely assembled and sealed.
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公开(公告)号：AU527313B2
公开(公告)日：1983-02-24
申请号：AU5459480
申请日：1980-01-14
Applicant: IBM
Inventor： MARRELLO VINCENT , ONTON AARE , RUHLE WOLFGANG
Abstract: A method of operating an alternating current (AC) excited thin film electroluminensence (ACTEL) device which improves the memory effect and brightness thereof is described. A typical ACTEL device has a thin luminescent layer made of ZnS thin film doped with Mn which is sandwiched between two dielectric layers. ACTEL devices exhibit a brightness versus voltage amplitude hysteresis loop which is commonly referred to as the memory effect. The application of a hybrid AC excitation waveform to the ACTEL device such as that shown in the Figure provides increased brightness and improved memory effect stability. The hybrid waveform has an initial portion 12A that is sufficiently high for efficient carrier generation and a remaining waveform portion 14A that is at a lower level than the initial portion for charge collection and holding purposes.
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