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    • 73. 发明公开
    • A disk drive in which magnetic head-to-disk capacitive coupling is eliminated
    • 平板电脑Besitigung von Magnetkopf zu Platte kapazitiver Kupplung。
    • EP0470349A2
    • 1992-02-12
    • EP91110278.8
    • 1991-06-21
    • Hewlett-Packard Company
    • Gailbreath, Samuel H.Davidson, Robert J.
    • G11B5/012G11B19/04G11B5/11G11B5/31G11B5/40
    • G11B19/04G11B5/012G11B5/11G11B5/3106G11B5/40
    • 5 n7 An improvement in a thin film magnetic data transducer (10) which prevents capacitive coupling between the transducer (10) and the disk (7) of a disk drive system for preventing possible damage to the transducer (10). The magnetic circuit of the transducer is attached to one end of an electrical connection (28, 30), and the other end of the electrical connection is attached to a ground (104) or a fixed predetermined potential. In the preferred embodiment of the present invention, the electrical connection is the center bond pad (32, 56) connection which is disconnected from the coil bond pad (50) and connected to the magnetic circuit (12, 22). With the disk (7) and the magnetic pole tips (14, 24) of the magnetic circuit at the same potential, capacitive charging and consequent current flow or arcing or discharge noise between the two are prevented. The present invention also prevents noise from current due to the variable capacitive coupling of the coil (18, 20) to the disk (7) during disk (7) rotation. The thin film magnetic transducer (10) is fabricated by depositing successive layers of an electrical insulating material (34), a magnetic material (22), insulating material (34), electrical conducting material for a coil (18, 20), insulating material (34) and magnetic material (12), in the order named on a substrate. The coil (18, 20) is a spiral and the magnetic material layers (12, 22) are joined (56) with each other at the inner end of the coil and encircle the coil (18, 20), providing a magnetic gap (54) between pole tips (14, 24) outside of the outer periphery of the coil (18, 20). One magnetic layer (12) has an integral extension (28) connected to the center bond pad (32), extending from the location where the magnetic layers are joined (56). The center bond pad (32) is connected to the frame (5) of the disk drive as are the disks (7), which is usually ground potential (104).
    • 薄膜磁数据传感器(10)的改进,其防止换能器(10)与盘驱动系统的盘(7)之间的电容耦合,以防止可能损坏换能器(10)。 换能器的磁路连接到电连接(28,30)的一端,并且电连接的另一端附接到地(104)或固定的预定电位。 在本发明的优选实施例中,电连接是与线圈接合焊盘(50)断开并连接到磁路(12,22)的中心接合焊盘(32,56)连接。 在磁路(7)和磁极尖端(14,24)处于相同电位的情况下,阻止了两者之间的电容充电和随之而来的电流或电弧放电噪声。 本发明还防止由于盘(7)旋转期间线圈(18,20)与盘(7)的可变电容耦合而引起的电流噪声。 薄膜磁换能器(10)通过沉积电绝缘材料(34),磁性材料(22),绝缘材料(34),用于线圈(18,20)的导电材料,绝缘材料 (34)和磁性材料(12)。 线圈(18,20)是螺旋线,并且磁性材料层(12,22)在线圈的内端彼此连接(56)并且环绕线圈(18,20),从而提供磁隙( 在线圈(18,20)的外周外的极尖(14,24)之间。 一个磁性层(12)具有连接到中心接合焊盘(32)的整体延伸部(28),从磁性层接合的位置延伸(56)。 中心接合焊盘(32)连接到磁盘驱动器的框架(5),通常为地电位(104)的磁盘(7)。
    • 76. 发明公开
    • Magnetic head
    • 磁头
    • EP0334512A3
    • 1990-04-25
    • EP89302338.2
    • 1989-03-09
    • MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    • Yohda, HiroshiInoue, Yasushi
    • G11B5/11G11B5/147
    • G11B5/1475G11B5/11
    • In a ring-shaped magnetic head in a sandwich structure of magnetic cores with nonmagnetic substrates, by achieving electric conductance between a pair of opposing magnetic cores, electrostatic noise generated due to sliding of the recording medium can be prevented without grounding the cores themselves. If mounted on an insulating head base, conductor for grounding is not needed. Besides, the head chip can be manufactured in a few manufacturing steps by the processing to achieve conductance between magnetic cores in a state of core block composed of plural head chips when manufacturing a magnetic head.
    • 在具有非磁性基板的磁芯的夹层结构中的环形磁头中,通过实现一对相对的磁芯之间的导电性,可以防止由于记录介质的滑动而产生的静电噪声,而不会使芯本身接地。 如果安装在绝缘基座上,则不需要用于接地的导体。 此外,在制造磁头时,可以在几个制造步骤中通过处理来制造头芯片,以在由多个头芯片构成的芯块的状态下实现磁芯之间的电导。