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    METHOD AND APPARATUS FOR DISORIENTING MAGNETIC PARTICLES
    12.
    发明专利
    METHOD AND APPARATUS FOR DISORIENTING MAGNETIC PARTICLES 未知

    公开(公告)号：CA1132006A

    公开(公告)日：1982-09-21

    申请号：CA327495

    申请日：1979-05-10

    Applicant: IBM

    Inventor： BATE GEOFFREY ,  DUNN LARRY P

    IPC: G11B5/845 ,  B05D3/14

    Abstract: This invention provides an improved method and apparatus for manufacturing magnetic recording media; specifically, that which is to be used in the manufacture of flexible, magnetic recording disks. The process provides a sequence of disorienting magnetic fields in different directions and of diminishing strengths to form a magnetic media in which the magnetic particles are essentially disoriented and the media is, thereby, devoid of modulated signal envelopes.

    LIGHT DEFLECTOR SYSTEMS
    15.
    发明专利
    LIGHT DEFLECTOR SYSTEMS 未知

    公开(公告)号：CA922553A

    公开(公告)日：1973-03-13

    申请号：CA62894

    申请日：1969-09-24

    Applicant: IBM

    Inventor： WELLBROCK ANTON G ,  BATE GEOFFREY

    IPC: G02B26/00 ,  G02B26/02

    Abstract: 1279661 Light deflector INTERNATIONAL BUSINESS MACHINES CORP 5 Nov 1969 [15 Nov 1968] 54164/69 Heading G2J A light deflector for directing a light beam 14 along a path pre-selected from two available paths 14A, 14D comprises a light transmissive element 10 having a beam receiving surface 11 and a boundary surface 13 and a reflective cell 17 containing a light transmissive fluid 21 retained by a light transmissive wall member 8, displaceable towards and away from said boundary surface, the arrangement being that when the wall member is displaced from the surface total internal reflection of a beam takes places at the surface but when the wall member and boundary surface are in abutting relationship, this reflection is frustrated. Cell 17 is composed of materials having the same refractive index and the wall member is preferably a transparent plate 18. A reflective backing member 20 defines with the plate 18 a chamber wherein the transparent fluid is disposed such that in the arrangement shown a beam of light e.g. 14, 14C will travel between the elements and be reflected 14D from the front reflecting surface 22 of the backing member 20 or from its rear surface 23, when the reflective coating is absent. Movement of the cell into and out of co-operation with the element 10 is achieved by Piezo-electric or magnetostrictive devices and this serves to provide digital offset of the incident light-beam. Fig. 6 (not shown) shows a device which can provide a continuously variable offset of the incident light-beam (over a larger range), according to an actuator which has for this purpose an inter-connected reservoir of fluid to enable the volume of the cell to be varied. The deflector may also be combined Fig. 5 (not shown) with others, not necessarily in the same place to provide a system giving a series of offset light-beams for a single incident beam. The light transmissive element may be a right angle prism a non right angle prism, a curved body or a non-planar body. Reference has been Directed by the Comptroller to Specification 1215209.

    16.
    发明专利
    未知

    公开(公告)号：DE2130702A1

    公开(公告)日：1971-12-30

    申请号：DE2130702

    申请日：1971-06-21

    Applicant: IBM

    Inventor： KARL ALSTAD JOHN ,  DENTON ARMITAGE JUN JOHN ,  BATE GEOFFREY

    IPC: G02F1/09 ,  G11B11/105 ,  G02F1/18

    Abstract: 1287864 Optical playback of magnetic records INTERNATIONAL BUSINESS MACHINES CORP 11 May 1971 [25 June 1970] 14186/71 Heading G5R A magneto-optical transducer using the Kerr effect and/or the Faraday effect comprises an optical prism having a magnetic film 34, Fig. 3, or 62, Fig. 11, on one surface and mounted so that a moving magnetic record, e.g. a tape 14, passes a second surface of the prism and an edge of the magnetic film. The magnetic film may be sandwiched between two such prisms of which the second surfaces may be coated with a reflecting material 69, Fig. 11, and may be curved, Fig. 8 (not shown), and/or grooved, Fig. 10 (not shown). Alternate layer of ferromagnetic and dielectric material may form the magnetic film (56), Fig. 10 (not shown). A bias field along the magnetic film may be produced by a pair of coils (54) mounted on either side of the transducer, Fig. 9 (not shown).

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