公开(公告)号：DE1524874A1

公开(公告)日：1970-10-22

申请号：DE1524874

申请日：1967-10-05

Applicant: IBM

Inventor： CECIL BRADFORD REX ,  EMIL BRAUN RICHARD

IPC: G11B5/127 ,  G11B5/265 ,  G11B23/00 ,  G11B5/00

公开(公告)号：DE1474396A1

公开(公告)日：1969-07-17

申请号：DE1474396

申请日：1965-12-28

Applicant: IBM

Inventor： CECIL BRADFORD REX ,  HENRY COOK MILES ,  RAYMOND KELSOF HENRY

IPC: G11B5/127 ,  G11B5/29

公开(公告)号：DE1499710A1

公开(公告)日：1969-11-06

申请号：DE1499710

申请日：1966-07-29

Applicant: IBM

Inventor： ARTHUR BARBEAU RAYMOND ,  ROBERT FRAIM NORMAN ,  ERNEST LOCKETT DONALD ,  CECIL BRADFORD REX

IPC: G11B5/00 ,  G01D15/12

Abstract: 1,139,640. High density recording. INTERNATIONAL BUSINESS MACHINES CORP. 4 Aug., 1966 [10 Aug., 1965], No. 34896/66. Heading G5R. In a method of high density recording, the recording head gap length is less than the thickness of the magnetizable layer of the tape. Normal magnetic tape is used having a layer thickness of 0À0005 inches and by using a head with a gap length of 0À0001 inches a recording density in excess of 800 bits/inch can be achieved.