公开(公告)号：JPH0197064A

公开(公告)日：1989-04-14

申请号：JP25392587

申请日：1987-10-09

Applicant: IBM

Inventor： ITO MASAHARU ,  TOYOKAWA KAZUHARU ,  YANAGISAWA HIROSHI

IPC: H04N1/387 ,  H04N1/411 ,  H04N1/413

Abstract: PURPOSE: To reduce the amounts of compressed data indicating an original image by selecting extracting the bell signals of the original image stored at the bell positions of an input image buffer after dividing them into those at every other bell position and the other at the residual bell positions, and preparing compressed data. CONSTITUTION: An input image buffer 24A stores bell signals indicating an original image at bell positions. First compressed data indicating the bell signals stored in every other bell position in the buffer 24A and second compressed data indicating the residual bell signals are generated by a sampling unit 25 and a compressing/extending unit 26, and transmitted through a buffer memory 7 and a transmission line 6 to a buffer memory 3 of a host processor 1, and stored in a data memory 4 under the control of a control unit 5. The compressed data are extracted from the data memory 4, extended through the buffer memories 3 and 7 by the compressing/extending units 26 and the sampling unit 25, and an output image buffer 24B stores the reproduced first bell signals and second bell signals at each bell position.

公开(公告)号：JPS6213157A

公开(公告)日：1987-01-21

申请号：JP14691985

申请日：1985-07-05

Applicant: IBM

Inventor： ASADA SHIGEKI ,  YANAGISAWA HIROSHI

IPC: G06F3/00 ,  H04N1/028 ,  H04N1/04 ,  H04N1/17 ,  H04N1/19 ,  H04N3/14 ,  H04N5/335 ,  H04N5/341 ,  H04N5/372

公开(公告)号：JPS6055767A

公开(公告)日：1985-04-01

申请号：JP15422883

申请日：1983-08-25

Applicant: IBM

Inventor： MINNSHIYON JIYOOJI TANGU ,  YANAGISAWA HIROSHI

IPC: G06T3/40 ,  H04N1/387 ,  H04N1/393

公开(公告)号：JPS60148279A

公开(公告)日：1985-08-05

申请号：JP24562283

申请日：1983-12-28

Applicant: IBM

Inventor： ITOU MASAHARU ,  YANAGISAWA HIROSHI ,  NOKIMURA TAKETOSHI

IPC: G06T9/00 ,  H04N1/00 ,  H04N1/32 ,  H04N1/40 ,  H04N1/417

公开(公告)号：JP2000357379A

公开(公告)日：2000-12-26

申请号：JP2000170006

申请日：2000-06-07

Applicant: IBM

Inventor： OGASAWARA KENJI ,  YANAGISAWA HIROSHI ,  KOBAYASHI KEIJI

IPC: G11B21/10

Abstract: PROBLEM TO BE SOLVED: To enable eliminating needless spaces between data recording tracks by reading a servo pattern by a positioned read/write head, detecting amplitude of an generated output signal, and detecting that it has become a specific value of amplitude of an output signal from a positioning head. SOLUTION: It is detected that a servo pattern is read out by a read/write head being moving and its output signal value is made 50-Gw/2% of amplitude of an output signal generated by a positioned read/write head. Then, Gw is a scheduled gap width between data recording tracks. Reduction of amplitude of an output signal to 50-Gw/2% indicates that a head is moved from a prescribed position by (Hw+Gw)/2(Hw is head width), when it is not decreased, it is examined whether a head reaches a crush-stop of the outside or not.

公开(公告)号：JPH08263815A

公开(公告)日：1996-10-11

申请号：JP23191294

申请日：1994-09-27

Applicant: IBM

Inventor： OGASAWARA KENJI ,  YANAGISAWA HIROSHI ,  KURACHI KOJI

IPC: G11B21/10 ,  G11B5/55 ,  G11B5/596 ,  G11B5/53

Abstract: PURPOSE: To accurately position write and read magnetic heads by forming plural data tracks in a prescribed direction and recording 1st to 4th burst patterns. CONSTITUTION: Plural burst pattern recording areas 50 are formed radially along a radial direction of a disk 18 and remaining areas are used for a data track area 52. A test pattern is formed on the areas 50 by recording data in a prescribed pattern. The test patterns are made up of four burst pattern strings A-D formed radially on the disk 18. In each of the data recording areas for each burst pattern string, an interval between the adjacent areas along the radial direction of the disk 18 is selected equal to a pitch P of the data track areas 54.

公开(公告)号：JPH0845036A

公开(公告)日：1996-02-16

申请号：JP7102995

申请日：1995-03-29

Applicant: IBM

Inventor： GUREN ADAMU GAAFUANKURU ,  MAIKU POURU SARO ,  AOYANAGI AKIHIKO ,  YANAGISAWA HIROSHI ,  TERAJIMA HIROSHI ,  KUROKI KENJI

IPC: G11B5/00 ,  G11B5/39 ,  G11B5/465 ,  G11B5/48 ,  G11B19/02

Abstract: PURPOSE: To improve productivity by simultaneously initializing MR elements by a strong uniform magnetic field at a time point when an actuator head stack is constituted. CONSTITUTION: An MR sensor is formed on a vertical surface 31 of a slider 13 by an MR element 32 made of a ferromagnetic material and a lateral bias layer 38 made of a soft magnetic material, and has its air bearing surface ABS brought in close contact with a magnetic recording surface of a recording medium. In order to read magnetic recording on both sides of the recording medium, an actuator head stack is constituted by a pair of upper and lower MR sensors with air bearing surfaces ABS thereof facing each other. At this point, an initialized magnetic field H1 N1 T is applied by a strong uniform magnetic field of an electromagnet or the like, thereby simultaneously initializing the MR elements 32. That is, the upper and lower MR sensors have opposite directions of initialized magnetic field H1 N1 T. Thus, a wiring is so set that a sensor current I is in opposite directions in the upper and lower MR sensors, thereby obtaining an output of correct polarity.