公开(公告)号：US3706926A

公开(公告)日：1972-12-19

申请号：US3706926D

申请日：1971-06-04

Applicant: IBM

Inventor： BARRAGER STEPHEN M ,  BATE GEOFFREY ,  SMITH SIDNEY H

IPC: G11B5/31 ,  G01R35/00

CPC classification number: G11B5/314 ,  G11B5/3166 ,  Y10T29/49004 ,  Y10T29/49036 ,  Y10T29/49046 ,  Y10T29/49048

Abstract: Magnetic head elements are batch fabricated on areas of a substrate. During manufacture, and before final separation and processing of the areas into discrete multi-track magnetic heads, defective areas are identified for removal. An electric signal source subjects the head areas to a magnetic field which is detected as electric current in each head area. The detected current value in acceptable head areas falls within a predefined range. All head areas having a current outside the range are defined as defective. The magnetic field emanates from one set of head areas in the vicinity of another set of head areas being tested.

Abstract translation: 磁头元件是在衬底的区域上批量制造的。 在制造期间，并且在将区域最终分离和处理成离散多磁道磁头之前，确定缺陷区域以便去除。 电信号源使头部区域受到在每个头部区域中被检测为电流的磁场。 可接受的头部区域中检测到的电流值落在预定范围内。 具有超出范围的电流的所有头部区域被定义为有缺陷的。 磁场从被测试的另一组头部区域附近的一组头部区域发出。

公开(公告)号：US3881190A

公开(公告)日：1975-04-29

申请号：US39921873

申请日：1973-09-20

Applicant: IBM

Inventor： BROCK GEORGE W ,  SHELLEDY FRANK B ,  SMITH SIDNEY H ,  WILLS ARTHUR B

IPC: G11B5/33 ,  G11B5/39 ,  G11B5/16 ,  G11B5/22

CPC classification number: G11B5/39 ,  G11B5/332

Abstract: A magnetoresistive (MR) head with an unusually desirable spatial resolution includes a shield on each side of the MR element. Information is carried on a magnetizable medium as recorded magnetic areas. The shields are spaced apart by a distance on the order of and less than the shortest recorded wavelength for which the head is meant to be used. The MR element and the shields have their edges nearest the medium in a common plane perpendicular to the vertical component of a signal from the recorded area. An additional shunt bias layer may be provided immediately adjacent and coextensive the MR element, and the head may serve one or many tracks.

Abstract translation: 具有异常期望的空间分辨率的磁阻（MR）头包括在MR元件的每一侧上的屏蔽。 信息在可磁化介质上作为记录磁区进行。 屏蔽物隔开一定距离并且小于头部意图使用的最短记录波长的距离。 MR元件和屏蔽件在垂直于来自记录区域的信号的垂直分量的公共平面中具有最靠近介质的边缘。 附加的分流偏置层可以紧邻MR元件并且共同延伸，并且头可以用于一个或多个轨道。

公开(公告)号：US3576282A

公开(公告)日：1971-04-27

申请号：US3576282D

申请日：1969-06-30

Applicant: IBM

Inventor： EPINA AUGUST P JR ,  SMITH SIDNEY H

IPC: G06K13/26 ,  B65H23/188 ,  G11B15/58 ,  G11B15/665 ,  G11B15/67 ,  G11B23/12

CPC classification number: G11B15/58 ,  G11B15/665

Abstract: Magnetic-recording tape disposed on a rotatable spool in a cartridge is pneumatically loaded into first and second tape storage chambers. The first chamber is adjacent the tape exit portion of the cartridge and vacuum in such first chamber tends to pull the tape thereinto to the exclusion of the second chamber. To cause a tape loop to be formed in the second storage chamber, the second chamber (remote from the exiting portion of the cartridge) has an enlarged opening creating a greater pneumatic force to thereby attract the tape thereinto to the exclusion of the first chamber. Yieldable limiting means are provided in the second chamber as a reduced cross-sectional portion wherein the tape attracting force is equalized between the two storage chambers. Thereafter, the tape is loaded into the first chamber to the exclusion of the second chamber.