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    1.
    发明专利
    未知

    公开(公告)号：FR2435098A1

    公开(公告)日：1980-03-28

    申请号：FR7825569

    申请日：1978-08-29

    Applicant: IBM

    Inventor： RIGBEY LEONARD J ,  PASCUAL RAPHAEL ,  COX ALLEN R

    IPC: G11B5/60 ,  G11B17/32 ,  G11B21/16

    Abstract: In a recorder having a transducer with a gap which coacts with a flexible medium to record and/or reproduce data, an endless groove is positioned on the transducer to circumscribe the gap.

    ELECTRO-OPTIC DISPLAY CELL AND METHOD OF MAKING SAME
    5.
    发明专利
    ELECTRO-OPTIC DISPLAY CELL AND METHOD OF MAKING SAME 未知

    公开(公告)号：CA1253942A

    公开(公告)日：1989-05-09

    申请号：CA495822

    申请日：1985-11-20

    Applicant: IBM

    Inventor： COX ALLEN R ,  LOWE ANTHONY C ,  WOOD JOHN C

    IPC: G02F1/137 ,  G02F1/13 ,  G02F1/1339 ,  G02F1/1341 ,  G02F1/15 ,  G02F1/161 ,  G02F1/01

    Abstract: An electro-optic display cell has an arrangement of display electrodes in contact with a liquid within a sealed enclosure. The enclosure comprises an impervious transparent cover and a rigid structural wall member. A seal between the cover and wall member and an elastomeric plug extending between the exterior and interior complete the enclosure. The cell is filled by injecting the liquid into the presealed enclosure by perforating the plug with hollow needles also employed to remove entrapped gas. Upon withdrawal of the needles the perforations collapse to self-seal the enclosure but for added integrity the plug is also mechanically clamped. Conveniently, the seal and plug can be formed as an integral elastomeric moulding around a frame member forming the side wall of the enclosure and the frame member clamped between the cover and a separate base.

    METHOD OF MAKING EDGE PROTECTED FERRITE CORE
    6.
    发明专利
    METHOD OF MAKING EDGE PROTECTED FERRITE CORE 未知

    公开(公告)号：CA1187040A

    公开(公告)日：1985-05-14

    申请号：CA419768

    申请日：1983-01-19

    Applicant: IBM

    Inventor： BURKHART ROBERT W ,  COX ALLEN R ,  HARTLEY JOHN D

    IPC: C23C14/34 ,  C23C14/50 ,  G11B5/133 ,  G11B5/187

    Abstract: The sputter deposition of a thin film of material on both sides of a thin substrate is performed by positioning the substrate sides orthogonal to the target and preferably radial to the deposition center of the sputter system. The vapor deposition of alumina on a this ferrite core for a magnetic head is accomplished by positioning the ferrite substrate in the vacuum chamber orthogonally to the target and radial to the particle deposition center. The alumina is deposited on both sides of the ferrite core simultaneous1y to substantially the same thickness. The deposition on both sides of the ferrite core protects the core against width erosion, and minimizes bending stress. In addition, signal output of the ferrite core when used in a magnetic head is increased.

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