公开(公告)号：CA1162228A

公开(公告)日：1984-02-14

申请号：CA352830

申请日：1980-05-27

Applicant: IBM

Inventor： CUNNINGHAM EARL A ,  CUTSHALL DAVID E ,  HEILING GERALD M ,  SODERSTROM RONALD L ,  THOMPSON JAMES M

IPC: B41J2/36 ,  B41J2/365 ,  B41M5/26

Abstract: A driver circuit for a thermal printing element varies the power applied to the element, depending upon its recent history of energization, in order to maintain uniform print density desprite temperature variation in the element. A capacitor charges and discharges to measure time intervals since the last element energization to control the voltage applied by an output transistor.

公开(公告)号：CA2138301C

公开(公告)日：1998-12-15

申请号：CA2138301

申请日：1994-12-15

Applicant: IBM

Inventor： OTTESEN HAL HJALMAR ,  CUNNINGHAM EARL A ,  GREENBERG RICHARD ,  BROWN DANA HENRY ,  SMITH GORDON JAMES ,  VANLEEUWEN GEORGE WILLARD ,  BILLINGS RUSSELL ALLEN

IPC: G11B5/012 ,  G11B5/55 ,  G11B5/596 ,  G11B7/0037 ,  G11B19/20 ,  G11B19/247 ,  G11B20/12 ,  G11B21/00 ,  G11B21/02 ,  G11B21/04 ,  G11B27/00 ,  G11B27/10 ,  H04N7/173

Abstract: A disk drive stores multimedia data in long spiral data tracks. The tracks on opposite surfaces of the disk spiral in opposite directions, so that a track on one surface can be read as the actuator sweeps in, and a track on the opposite surfa ce can be read as the actuator sweeps out. Because the actuator only follows spiral tracks without performing long seek operations, the actuator motor can be reduce d in size and stresses on actuator bearings and other parts are reduced. Additiona lly, due to reduced disturbances associated with seeks, it is possible to follow trac ks more closely and therefore reduce the width of individual tracks. Further cost reductions are accomplished by spinning the disks at a slower speed and reducing the size of the spin motor accordingly. Finally, data density can be increased s imply because multimedia data does not require the same low error rate as conventional data. Preferably, a group of disk drives optimized for multimedia data is used t o form a video-on-demand system. Compressed, interleaved portions of a video presentation, such as a motion picture, are stored in blocks on the spiral track s. The drives read the blocks on one spiral track at a time from beginning to end, placing the data from these blocks in a set of buffers corresponding to differen t short time intervals. Video signals are output from the buffers. Any short time interval of the presentation can be accessed on demand by switching to the appropriate buffer.

公开(公告)号：PL172653B1

公开(公告)日：1997-10-31

申请号：PL30313392

申请日：1992-09-16

Applicant: IBM

Inventor： CUNNINGHAM EARL A ,  HARWOOD RICHARD F

IPC: G11B5/60 ,  G11B21/21 ,  G11B17/32

Abstract: The leading (47) and trailing (48) edges are relative to the motion of the medium. The longitudinal axis is disposed along the length of the support structure and is at a skew angle ranging from zero to positive and negative valves, wrt the direction of motion. A pair of side rails is disposed along the side edges facing the recording medium. The side rails are non-identical and non-symmetrical about the axis for providing air pressurisation about the axis for providing air pressurisation when the skew angle varies over its range. The slider thus flies at a close, uniform spacing from the moving recording medium.

公开(公告)号：SG42837A1

公开(公告)日：1997-10-17

申请号：SG1996000011

申请日：1994-11-15

Applicant: IBM

Inventor： CHRISTNER JODIE ANN ,  CUNNINGHAM EARL A ,  KERWIN GREGORY JOHN ,  POSS JOE MARTIN

IPC: G11B5/00 ,  G11B5/012 ,  G11B5/02 ,  G11B5/035 ,  G11B5/39 ,  G11B5/465 ,  G11B19/02

Abstract: In a magnetic data storage device having data recorded in tracks on a media surface and including at least one magnetoresistive (MR) transducer read heads, the adaptive control method for the read head bias current involves determining an optimised bias current value for each MR head. The optimised values are stored, and the active MR head is supplied with a bias current in accordance with the stored value. The optimised bias current value is periodically re-determined for each MR head, and the stored bias current values are revised to correspond with the new optimised bias current values. The bias current values are stored on a disk media surface and are transferred from disk storage to random access memory during the power up sequence of the device.

公开(公告)号：BR9500049A

公开(公告)日：1995-11-07

申请号：BR9500049

申请日：1995-01-10

Applicant: IBM

Inventor： BILLINGS RUSSELL A ,  BROWN DANA H ,  CUNNINGHAM EARL A ,  GREENBERG RICHARD ,  OTTESEN HAL H

IPC: G11B5/09 ,  G06F3/06 ,  G11B5/012 ,  G11B5/55 ,  G11B5/596 ,  G11B7/0037 ,  G11B19/20 ,  G11B19/247 ,  G11B20/10 ,  G11B20/12 ,  G11B21/00 ,  G11B21/02 ,  G11B21/04 ,  G11B27/00 ,  G11B27/10 ,  H04N5/781 ,  H04N7/173 ,  G06F17/60

Abstract: Storing data on a data processing system is done upon generation of a data file by displaying a user interface allowing user selection of storage criteria for the data file. Responsive to user selection of storage criteria for a file determining a physical format type for the file from a plurality of available physical format types. Then the file is stored on a direct access storage device as at least a first record conforming with the determined physical format type.

公开(公告)号：CA2138301A1

公开(公告)日：1995-07-22

申请号：CA2138301

申请日：1994-12-15

Applicant: IBM

Inventor： OTTESEN HAL H ,  CUNNINGHAM EARL A ,  GREENBERG RICHARD ,  BROWN DANA H ,  SMITH GORDON J ,  VANLEEUWEN GEORGE W

IPC: G11B5/012 ,  G11B5/55 ,  G11B5/596 ,  G11B7/0037 ,  G11B19/20 ,  G11B19/247 ,  G11B20/12 ,  G11B21/00 ,  G11B21/02 ,  G11B21/04 ,  G11B27/00 ,  G11B27/10 ,  H04N7/173 ,  G11B7/09