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    52.
    发明专利
    未知

    公开(公告)号：DE68923539D1

    公开(公告)日：1995-08-24

    申请号：DE68923539

    申请日：1989-12-18

    Applicant: IBM

    Inventor： KROUNBI MOHAMAD TOWFIK ,  VOEGELI OTTO ,  WANG PO-KANG

    IPC: G11B5/39

    Abstract: A magnetoresistive (MR) read transducer comprising an MR layer (11) having passive end regions (14) separated by a central active region (12). A longitudinal bias is produced by a thin film (16) of hard magnetic material in the end regions only, and the thin film of hard magnetic material is spaced from the MR layer by a nonmagnetic spacer layer (18) so that a magnetostatic longitudinal bias is produced of a level to maintain the passive end regions of the MR layer in a stable state.

    SEMICONDUCTOR LASER DIODE ARRANGEMENT
    53.
    发明专利
    SEMICONDUCTOR LASER DIODE ARRANGEMENT 未知

    公开(公告)号：CA2036957C

    公开(公告)日：1994-09-06

    申请号：CA2036957

    申请日：1991-02-25

    Applicant: IBM

    Inventor： VOEGELI OTTO

    IPC: H01S5/00 ,  G02B5/08 ,  H01S3/00 ,  H01S5/18 ,  H01S5/42 ,  H01S3/025 ,  H01S3/101

    Abstract: A semiconductor device, formed on a wafer (13), comprises an array of laser diodes (Q1,Q2), each emitting a beam (B1,B2) parallel to the wafer surface, and, integrated with the array, individually tilted deflecting mirrors (R1,R2) forming an array of virtual sources (Q1',Q2'). Compared to the physical separation of the laser diodes, the virtual sources are spaced more closely, they can even be coincident, thereby reducing the apparent spacing between the beam origins. The reflected beams (B1',B2') are substantially perpendicular to the wafer providing a "surface-emitting" device. The required deflector configuration (54) can be fabricated in a single unidirectional process, the mirror positions and orientations being determined by proper segment geometry of the etch-mask.

    DIFFERENTIAL MAGNETORESISTIVE SENSOR FOR VERTICAL RECORDING
    56.
    发明专利
    DIFFERENTIAL MAGNETORESISTIVE SENSOR FOR VERTICAL RECORDING 未知

    公开(公告)号：CA1191606A

    公开(公告)日：1985-08-06

    申请号：CA430699

    申请日：1983-06-17

    Applicant: IBM

    Inventor： VOEGELI OTTO

    IPC: G11B5/39 ,  G11B5/127

    Abstract: DIFFERENTIAL MAGNETORESISTIVE SENSOR FOR VERTICAL RECORDING of The Disclosure An MR sensor is disclsoed in which a pair of thin film magnetoresistive strips are connected electrically in parallel between two terminals. Strips are spaced apart a distance which is small relative to the density of the stored data to be sensed. The strips are mutually-biased in opposite directions to corresponding points in the linear region of their respective curves by current from a constant source attached to one terminal. Since the resistance of each strip is equal, the current divides equally between the strips. The sensor is positioned adjacent the magnetic surface containing stored data. Vertical components of the magnetic field (preferably vertically recorded data) influence the resistance of the strips differentially. When the sensor encounters a vertical flux transition, the output voltage varies to produce a unimodal type pulse.

    FIELD ACCESS PROPAGATION OF BUBBLE LATTICE
    57.
    发明专利
    FIELD ACCESS PROPAGATION OF BUBBLE LATTICE 未知

    公开(公告)号：CA1071763A

    公开(公告)日：1980-02-12

    申请号：CA258554

    申请日：1976-08-06

    Applicant: IBM

    Inventor： MEHTA KAY B ,  VOEGELI OTTO

    IPC: G11C11/14 ,  G11C19/08

    Abstract: FIELD ACCESS PROPAGATION OF BUBBLE LATTICE A rotating field access pattern for use in the propagation of a bubble lattice is disclosed. The pattern contains two sets of parallel oblong elements that are substantially perpendicular to each other. Four specific permalloy patterns featuring one element per one, two, two and four bubble domains are shown.

    58.
    发明专利
    未知

    公开(公告)号：DE2835691A1

    公开(公告)日：1979-04-05

    申请号：DE2835691

    申请日：1978-08-16

    Applicant: IBM

    Inventor： MORTELMANS JOOST ,  VOEGELI OTTO

    IPC: G11C11/14 ,  G11C19/08 ,  H01F10/02 ,  H01F7/06

    Abstract: A drive system for a bubble memory consists of a drive assembly and an electrically conducting surface enclosing the drive assembly. In a preferred embodiment, the drive assembly consists of a ferrite picture frame with two pairs of drive coils and the conducting surface is the interior surface of a metallic box.

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