公开(公告)号：RU2141691C1

公开(公告)日：1999-11-20

申请号：RU96124499

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

IPC: G01B11/26 ,  G01D5/38 ,  G01B11/00 ,  G11B5/55 ,  G11B21/08 ,  G11B21/10

Abstract: FIELD: computer engineering. SUBSTANCE: servo recording system measures position of head drives and outputs reference synchronization signal using semiconductor lasers. Inner reference signals for detection of position are provided by reflecting diffraction gratings which are connected to head drive lever and sleeve of disk drive spindle. Optical detectors read differential alterations in diffraction patterns including sensitivity to frequency drift. Electronic decoders converts data from optical detectors into signals for changing servo drive position. Electronic control units excites linear drive motor in disk drive, which positions record converter into position which is required for storing servo information which is provided by generator of servo system pattern generator. Transparent windows which are provided in cover of jacket which holds head and disk provides possibility to make record in disk drive in assembled and pressurized state. EFFECT: elimination of intervention into design of disk drive, increased efficiency for high-density disk drives. 8 cl, 20 dwg

公开(公告)号：CA2144403A1

公开(公告)日：1995-11-28

申请号：CA2144403

申请日：1995-03-10

Applicant: IBM

Inventor： BEST JOHN STEWART ,  CHIANG WEN-WEI ,  HETZLER STEVEN ROBERT ,  HORNE DONALD EDWARD ,  LEE CHIH-KUNG ,  MARRELLO VINCENT

IPC: G01B11/00 ,  G01B11/26 ,  G01D5/38 ,  G11B5/55 ,  G11B21/08 ,  G11B21/10

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.

公开(公告)号：DE3062918D1

公开(公告)日：1983-06-09

申请号：DE3062918

申请日：1980-02-01

Applicant: IBM

Inventor： MARRELLO VINCENT ,  ONTON AARE ,  RUHLE WOLFGANG

IPC: H05B44/00 ,  G09G3/12 ,  G09G3/30

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.

公开(公告)号：CA1135386A

公开(公告)日：1982-11-09

申请号：CA344003

申请日：1980-01-18

Applicant: IBM

Inventor： MARRELLO VINCENT ,  ONTON AARE ,  RUHLE WOLFGANG

IPC: G09G3/12 ,  G09G3/30 ,  G11C11/42 ,  G11C11/14 ,  H01L33/00

Abstract: A METHOD OF IMPROVING THE MEMORY EFFECT AND BRIGHTNESS OF AN ALTERNATING CURRENT EXCITED THIN FILM ELECTROLUMINSCENT DEVICE A method for improving the memory effect and brightness of an alternating current (AC) excited thin film electroluminensence (ACTEL) device 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 provides increased brightness and improved memory effect stability. The hybrid waveform has an initial portion that is sufficiently high for efficient carrier generation and a remaining waveform portion that is at a lower level than the initial portion for charge collection and holding purposes. SA978040