公开(公告)号：EP0108060A4

公开(公告)日：1985-11-07

申请号：EP82902023

申请日：1982-05-17

Applicant: IBM

Inventor： AXMEAR FREDERICK EUGENE ,  BAXTER DUANE WILLARD ,  SAXMAN JOHN HUMPHREY ,  SIVERLING MICHAEL MCHUGH

IPC: G05D3/12 ,  G11B5/55 ,  G11B21/08

CPC classification number: G11B5/5547 ,  G11B21/083

Abstract: A sector servo seek control samples each sector to obtain sector time, the track identification within a sequence of track types and a position error signal for a track location to track location seek. The device during each sector determines the actual transducer track location and the next sector projected track location with respect to the sequence of track types. The projected track location is corrected using the error signal to find the actual location, but if a sector signal is missing or erroneous, the projected location is used as the actual location, permitting a composite correction to be made when a correct sector signal is obtained. The seek time is minimized by using maximum acceleration followed by maximum deceleration while not exceeding a velocity value that would cause the device to overshoot the target track using full deceleration.

公开(公告)号：DE1270097B

公开(公告)日：1968-06-12

申请号：DE1270097

申请日：1964-12-03

Applicant: IBM

Inventor： BAXTER DUANE WILLARD ,  FELTON BRUCE CHARLES ,  WERNER ANTON ,  WINNARD JAMES ROBERT

IPC: H03K3/315 ,  H04L25/04

公开(公告)号：DE2726746A1

公开(公告)日：1978-01-05

申请号：DE2726746

申请日：1977-06-14

Applicant: IBM

Inventor： BAXTER DUANE WILLARD ,  SHIPWAY RICHARD EDWARD

IPC: G01N21/88 ,  G01B11/24 ,  G01N21/93 ,  G01N21/956 ,  G01R31/308 ,  G06T1/00 ,  H05B39/08 ,  G01R31/28

Abstract: Successive areas of a high-resolution object image are compared with corresponding areas of a low-resolution master pattern to produce signals representing the quality of the object. Comparison is effected by detecting which of a set of features occurs in each area of the object image, detecting which feature of the same set occurs in a larger area of the master pattern, and determining whether these two features are the same.

公开(公告)号：DE3280376D1

公开(公告)日：1992-01-02

申请号：DE3280376

申请日：1982-05-17

Applicant: IBM

Inventor： AXMEAR FREDERICK EUGENE ,  BAXTER DUANE WILLARD ,  SAXMAN JOHN HUMPHREY ,  SIVERLING MICHAEL MCHUGH

IPC: G05D3/12 ,  G11B5/55 ,  G11B21/08

Abstract: An analog position error signal is digitised and latched. If a signal occurs on missing sector line, the output of selection circuit goes to five zero bits and error correction is prevented. The lost sector projected position, latched during the previous cycle register is truncated and rounded to an integer indicating the track type by a circuit. The select circuit also responds to the missing sector signal to select the last sector projected position from the bus. The selection circuit outputs are summed and an actual position signal is put on a bus. A circuit subtracts the last position stored from the bus position, to derive a valve representing velocity in the sector, which is latched. The velocity is then used to compute a projected location which is put onto a bus and loaded into the output register of the projected track psotion circuit. In this way, on error condition can be allowd for several sector times before the condition is reached where the next sector signal can not restore the correct actual position.

公开(公告)号：DE3164854D1

公开(公告)日：1984-08-23

申请号：DE3164854

申请日：1981-04-28

Applicant: IBM

Inventor： BAXTER DUANE WILLARD ,  EVJEN JOSEPH LEWIS ,  HOVELAND WILLIAM CHARLES ,  ROBLE ROY ARNOLD ,  SMITH DONALD RAYMOND ,  WIRZ JOHN HENRY

IPC: G11B21/10 ,  G11B5/596 ,  G11B5/58 ,  G11B27/00

Abstract: A rotating magnetic disk storage assembly (10) using sector servo information on the disks (9), is initialized with servo information by first using the dedicated product transducer heads (14) and accessing mechanism (13), to write on the innermost and outermost data tracks. The data tracks written by each transducer head are read using the heads (16) of a precision servowriter mechanism positioned at the expected data track positions. Errors between expected and actual positions are determined and in turn each servo writer head is positioned to duplicate the path of the product head written innermost and outermost tracks. By offsetting the precision servowriter head by a half track pitch and writing the servo information to form equally spaced tracks, the disk is initialized with full track pitch servo information which is positioned and aligned with the position and alignment of the dedicated product head assembly. This is repeated for each disk and servo writer head.