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    MAGNETIC TAPE
    32.
    发明专利
    MAGNETIC TAPE 失效

    公开(公告)号：JPH10214411A

    公开(公告)日：1998-08-11

    申请号：JP1861297

    申请日：1997-01-31

    Applicant: TORAY INDUSTRIES

    Inventor： ONO MASAAKI ,  OKAMOTO KATSUYA ,  SUZUKI MASARU

    IPC: G11B5/66 ,  G11B5/65 ,  G11B5/73

    Abstract: PROBLEM TO BE SOLVED: To prevent dew condensation and to obtain a consumer digital video tape excellent in electromagnetic conversion characteristics and durability by forming a ferromagnetic metal thin film having specified surface roughness and recesses of a specified size on one surface of a polyester film. SOLUTION: A high strength film is prepared by incorporating >=80% polyethylene terephthalate or polyethylene-2,6-naphthalate and by orientation of molecules, and a metal thin film layer containing specified ferromagnetic fine particles is formed on one surface of the film. The center line roughness (SRa) of the metal thin film layer is controlled to 2 to 5nm to balance the wearing property and output characteristics, and the ten-point average surface roughness SRz of the layer is controlled to 10 to 50nm, to maintain the durability of the magnetic film. By forming recesses each having 0.5 to 5μm diameter and 1 to 50nm depth by 1×10 to 1×10 recesses/mm on the surface, sticking of the video tape to a drum due to dew condensation can be prevented and the contact state between the tape and a head can be maintained in a good state.

    MAGNETIC TAPE
    33.
    发明专利
    MAGNETIC TAPE 失效

    公开(公告)号：JPH10214410A

    公开(公告)日：1998-08-11

    申请号：JP1861197

    申请日：1997-01-31

    Applicant: TORAY INDUSTRIES

    Inventor： ONO MASAAKI ,  HARADA SUNAO ,  SUZUKI MASARU

    IPC: G11B5/66

    Abstract: PROBLEM TO BE SOLVED: To improve moisture resistance and storage property and to prevent deterioration in electromagnetic characteristics due to adsorption of water by forming a ferromagnetic metal thin film layer on one surface (A) of a polyester film and constituting the surface (A) in such a structure that the surface (A) consists of a film and fine particles present in the film or on the film surface and that the film essentially consists of an easy-adhering polymer containing a fluorine or silicon compd. as a copolymer component. SOLUTION: A film is prepared by using polyethylene terephthalate or polyethylene-2,6-naphthalate which can be formed as a high strength film by orientation of molecules, and further a film is applied to constitute a surface (A) of the high strength film. The film on the surface (A) contains >50wt.% easy-adhering polymer having a fluorine or silicon compd. as a copolymer component. Thus, the moisture resistance and storage property of a ferromagnetic metal thin film layer can be improved. The center line surface roughness SRa and the ten-point average surface roughness SRz of the surface (A) where the ferromagnetic metal thin film is formed are specified to 2 to 5nm and 10 to 50nm, respectively, so as to obtain good output characteristics of a video tape and to improve its durability.

    MAGNETIC TAPE
    34.
    发明专利
    MAGNETIC TAPE 失效

    公开(公告)号：JPH10172126A

    公开(公告)日：1998-06-26

    申请号：JP32844096

    申请日：1996-12-09

    Applicant: TORAY INDUSTRIES

    Inventor： ONO MASAAKI ,  HARADA SUNAO ,  TAMADA KAZUSHI

    IPC: G11B5/66 ,  G11B5/64 ,  G11B5/65 ,  G11B5/73

    Abstract: PROBLEM TO BE SOLVED: To reduce a dropout by providing a ferromagnetic metallic thin film layer on a one side surface A of a polyester film and making the SRa value, SRz value and surface waviness respectively specified ranges. SOLUTION: The SRa value of the ferromagnetic metal thin film layer of this magnetic tape is 2-5nm, the SRz value is 40-70nm, and the surface waviness is 30nm or below. When the SRa value is

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