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    4.
    发明专利
    未知

    公开(公告)号：DE3770384D1

    公开(公告)日：1991-07-04

    申请号：DE3770384

    申请日：1987-07-31

    Applicant: IBM

    Inventor： BLOCK TIMOTHY ROY ,  ENSTROM MARK RICHARD ,  LUECKE FRANCIS STEPHEN ,  SHIDLER KARL ALLEN ,  SODERSTROM RONALD LEE

    IPC: G11B7/085 ,  G01B9/02 ,  G11B5/55 ,  G11B21/08

    Abstract: In this system the light reflected back over the path (10a) to be measured is fed directly into a semiconductor laser (8a). As is commonly known, the introduction of reflected power through the front, or emitting, facet of the laser actually alters the power present in the laser with an attendant effect on the signal from a photosensor (15) usually located on the rear facet of the laser. The output signal from the photosensor associated with the laser has an asymmetric sawtooth (triangular) waveform. This is in contrast to the output signal from a conventional interferometer which has a sinusoidal waveform. The photosensor output signal is profoundly affected by the return beam. Also unexpectedly, the sawtooth output signal from the photosensor is an essentially linear signal over the range between adjacent fringes. That is, except for the transition at positive and negative peaks. As the path length (10a) of the reflected beam is increased or decreased, the sawtooth output signal changes in a direct linear relationship to the change in path length. This allows precise measurement of changes in distance less than the distance between adjacent fringes.

    TWO AXIS ELECTROMAGNETIC ACTUATOR
    5.
    发明专利
    TWO AXIS ELECTROMAGNETIC ACTUATOR 未知

    公开(公告)号：DE3477295D1

    公开(公告)日：1989-04-20

    申请号：DE3477295

    申请日：1984-12-04

    Applicant: IBM

    Inventor： LUECKE FRANCIS STEPHEN

    IPC: H02K33/00 ,  G11B7/09 ,  H02K41/02 ,  H02K41/035

    Abstract: A two axis electromagnetic actuator having balanced crossed coil structures supported by two sets of leaf springs (19A-D, 22A-B) and positioned in dual air gaps for motion in a direction representing the vector sum of the movement in two orthogonal directions.

    7.
    发明专利
    未知

    公开(公告)号：DE69109354D1

    公开(公告)日：1995-06-08

    申请号：DE69109354

    申请日：1991-02-13

    Applicant: IBM

    Inventor： LUECKE FRANCIS STEPHEN

    IPC: G11B5/48 ,  G11B5/55 ,  G11B7/085 ,  G11B21/02 ,  G11B21/08 ,  G11B7/08

    Abstract: A transducer head 34 is located on a head arm 30. The head arm has a roller surface 38 which contacts a fixed surface 22 at a point of contact 40. The roller surface is attached to the fixed surface such that the roller surface may roll along said fixed surface without slipping. The roller surface and the fixed surface are such that a line 44 between the point of contact and a disk centre is always perpendicular to a line between the disk centre and the transducer head for all positions as the roller surface rolls along the fixed surface.

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