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    MANUFACTURE OF MAGNETIC RECORDING CARRIER FOR VERTICAL RECORDING
    2.
    发明专利
    MANUFACTURE OF MAGNETIC RECORDING CARRIER FOR VERTICAL RECORDING 失效

    公开(公告)号：JPH02185712A

    公开(公告)日：1990-07-20

    申请号：JP23738289

    申请日：1989-09-14

    Applicant: BASF AG

    Inventor： ARENTO BUERUNAA ,  HARUTOMUUTO HIBUSUTO ,  EERITSUHI HEDEITSUKE

    IPC: G11B5/85

    Abstract: PURPOSE: To provide a magnetic recording carrier having remarkable crystallographic perpendicular orientation and magnetic perpendicular orientation by setting the substrate temp. at the time of starting coating of the substrate to be executed by a PVD method by using a cobalt-contg. ferromagnetic metallic layer at a higher temp. during coating by external heating of a medium. CONSTITUTION: The substrate S has the temp. TS1 at the time of starting the coating of the substrate S executed by the PVD method by using the cobalt- contg. ferromagnetic metallic layer. The nonmagnetic substrate is coated with a metallic layer having perpendicular magnetic anisotropy to the cobalt-contg. ferromagnetic metallic layer by the PVD method when this temp. is risen to the temp. TS2 higher than the TS1 during the coating by the external heating F of the substrate S. As a result, high coercive force and simultaneously the crystallographic perpendicular orientation and magnetic perpendicular orientation of the magnetic layer are made remarkable.

    IRREVERSIBLE OPTICAL RECORDING MEDIUM AND MANUFACTURE OF THE SAME
    3.
    发明专利
    IRREVERSIBLE OPTICAL RECORDING MEDIUM AND MANUFACTURE OF THE SAME 失效

    公开(公告)号：JPS6457435A

    公开(公告)日：1989-03-03

    申请号：JP6066888

    申请日：1988-03-16

    Applicant: BASF AG

    Inventor： ARENTO BUERUNAA ,  HARUTOMUUTO HIBUSUTO ,  HERUMUUTO BARUTSUINSUKII

    IPC: G11B5/74 ,  G11B7/24 ,  G11B7/253 ,  G11B7/26 ,  G11B11/105

    Abstract: PURPOSE: To cost-effectively form an irreversible optical recording medium by applying the dispersion of polymer spheres having a specific diameter on a flat auxiliary substrate, depositing a conductive layer by evaporation on this layer, separating this layer and using the layer as a stamper. CONSTITUTION: The dispersion of the polymer spheres having the diameter of 50 to 200nm in a solvent is applied on the flat auxiliary substrate and the metallic layer generally consisting of silver is applied on this layer by high- vacuum vapor deposition or cathode sputtering so as to have 0.1 to 0.5mm thickness. The resulted negative duplicate is used as a mold for forming a substrate having a textured surface. The textured substrate is formed by an injection molding technique using the press or stamper in such a manner and, in succession, a metal or semiconductor layer having optical absorptivity of 5 to 95% and thickness of 10 to 50nm is put on the textured surface of the substrate. As a result, the irreversible optical recording medium is easily formed at a desirable cost.

    MAKING OF MAGNETICALLY RECORDING CARRIER
    7.
    发明专利
    MAKING OF MAGNETICALLY RECORDING CARRIER 失效

    公开(公告)号：JPS6470925A

    公开(公告)日：1989-03-16

    申请号：JP19624288

    申请日：1988-08-08

    Applicant: BASF AG

    Inventor： ARENTO BUERUNAA ,  HARUTOMUUTO HIBUSUTO ,  EERIHI HEDEITSUKU ,  YOOHAN KUROONENBITAA

    IPC: G11B5/84 ,  G11B5/85 ,  G11B5/851 ,  H01F10/26

    Abstract: PURPOSE: To enhance magnetic characteristics as well as to improve the bonding strength of a magnetic layer to the substrate by cleaning the surface of an underlayer by RF sputter etching, oxidizing the cleaned surface and successively forming a Cr-contg. middle layer and a ferromagnetic metallic layer. CONSTITUTION: An Al substrate with a nonmagnetic amorphous Ni-P underlayer is subjected to RF sputter etching to remove the surface of the underlayer by 1-20μm and the surface is oxidized by contact with an oxygen-contg. gaseous mixture for 10sec to 12hr. The oxidized surface is successively coated with a Cr-contg. middle layer and a ferromagnetic metallic layer and then a protective layer is disposed on the metallic layer. These layers are generally formed by DC magnetron sputtering. The bonding strength of the magnetic layer to the substrate is improved as compared with that attained by known technique and the objective rigid thin film magnetic disk type magnetic recording carrier having very satisfactory magnetic characteristics, in particular high coercive force and high intensity of a magnetic field is produced.

    IRREVERSIBLE OPTICAL RECORDING MEDIUM AND MANUFACTURE OF THE SAME
    8.
    发明专利
    IRREVERSIBLE OPTICAL RECORDING MEDIUM AND MANUFACTURE OF THE SAME 失效

    公开(公告)号：JPS6457436A

    公开(公告)日：1989-03-03

    申请号：JP6066988

    申请日：1988-03-16

    Applicant: BASF AG

    Inventor： ARENTO BUERUNAA ,  HARUTOMUUTO HIBUSUTO ,  HERUMUUTO BARUTSUINSUKII

    IPC: G11B7/24 ,  G11B7/253 ,  G11B7/26

    Abstract: PURPOSE: To cost-effectively form an irreversible optical recording medium by applying the dispersion of polymer spheres having a specific diameter on a flat auxiliary substrate, depositing a conductive.layer by evaporation on this layer, separating this layer and using the layer as a stamper. CONSTITUTION: The dispersion of the polymer spheres having the diameter from 200 up to 500nm in a solvent is applied on the flat auxiliary substrate. The thickness of this layer is increased until metallic replicas may be separated from each other. A metallic layer generally consisting of silver is applied on this layer by high-vacuum vapor deposition or cathode sputtering so as to have 0.1 to 0.5mm thickness. The resulted negative duplicate is used as an inscribing mold for forming a substrate having a textured surface and is obtd. by injection molding, injection inscribing, pressing or casting. A special gold layer or semiconductor layer having optical absorptivity of 5 to 95% and 10 to 50nm thickness is finally mounted on thereon. As a result, the irreversible optical recording medium is easily formed at a desirable cost.

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