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91. 发明专利

JPH08235558A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH08235558A
公开(公告)日：1996-09-13
申请号：JP4025395
申请日：1995-02-28
申请人： SONY CORP
发明人： ITO JOTA , CHIBA KAZUNOBU , TAKEDA TSUTOMU , MATSUMURA SHINICHI
IPC分类号： G11B5/66 , G11B5/64 , G11B5/65 , G11B5/73 , G11B5/733 , G11B5/704
摘要： PURPOSE: To improve durability as well as to ensure satisfactory electromagnetic transducing characteristics by incorporating at least two kinds of particles different from each other in average particle diameter into a nonmagnetic substrate. CONSTITUTION: A magnetic layer made of a metallic magnetic thin film is formed on a nonmagnetic substrate contg. 1st particles of 60-300nm average particle diameter and 2nd particles of 20-50nm average particle diameter. Since protrusions owing to the 1st particles are formed on the surface of the magnetic layer at 1×10 -1×10 /mm density and protrusions owing to the 2nd particles are formed at 1×10 -5×10 /mm density, running durability can be improved without deteriorating electromagnetic transducing characteristics. Since the protrusions on the surface of the magnetic layer can be controlled by the average particle diameters and amts. of the particles incorporated into the nonmagnetic substrate, cost can be reduced.

92. 发明专利

JPH0721560A PRODUCTION OF MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH0721560A
公开(公告)日：1995-01-24
申请号：JP18331693
申请日：1993-06-30
申请人： SONY CORP
发明人： ITO JOTA
IPC分类号： G11B5/85 , G11B5/852
摘要： PURPOSE:To efficiently form a vapor-deposited film having an obliquely inclined axis of easy magnetization and to produce a magnetic recording medium excellent in recording and reproducing characteristics with high productivity. CONSTITUTION:When an evaporating source 7 is disposed opposite to a continuously running nonmagnetic substrate 2 and a flow of metal vapor evaporated from the source 7 is stuck on the substrate 2 from an almost perpendicular direction, a magnetic field is applied to the flow of metal vapor in a direction parallel to the longitudinal direction of the substrate.

93. 发明专利

JPH06338049A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH06338049A
公开(公告)日：1994-12-06
申请号：JP12751893
申请日：1993-05-28
申请人： SONY CORP
发明人： HONDA HIDETOSHI , SATO YASUYOSHI , SATO TAKETOSHI , ITO JOTA , EBINE YOSHITO , SASAKI RIICHI
IPC分类号： G11B5/72 , G11B5/73 , G11B5/733 , G11B5/84
摘要： PURPOSE:To provide a magnetic recording medium capable of improving its durability while ensuring satisfactory electromagnetic transducing characteristics. CONSTITUTION:A magnetic layer 2 made of a metallic magnetic thin film and a carbon protective film 3 are formed on a nonmagnetic substrate 1. The surface of the protective film 3 has 1st surface protrusions 4 formed by 1st particles 6 and 2nd surface protrusions 5 formed by 2nd particles 7. The surface properties of the protective film 3 are regulated by properly combining the thickness of the film 3 with the height and density of the 1st surface protrusions 4 and the height and density of the 2nd surface protrusions 5.

94. 发明专利

JPH06314422A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH06314422A
公开(公告)日：1994-11-08
申请号：JP12469993
申请日：1993-04-30
申请人： SONY CORP
发明人： HONDA HIDETOSHI , SATO TAKETOSHI , ITO JOTA , SATO YASUYOSHI
IPC分类号： G11B5/66 , G11B5/65 , G11B5/73 , G11B5/733
摘要： PURPOSE:To obtain a magnetic recording medium capable of improving its running durability while ensuring satisfactory electromagentic transducing characteristics by forming two kinds of protrusions on a nonmagnetic substrate at the required density each. CONSTITUTION:In a metallic magnetic thin film type magnetic recording medium, 1st surface protrusions having 35t+ or -15nm height and 2nd surface protrusions having 9+ or -4nm height are formed on the surface of the magnetic layer 2 at 1.0X10 -7.0X10 /mm and 600X10 -9,000X10 /mm density, respectively.

95. 发明专利

JPH05225544A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH05225544A
公开(公告)日：1993-09-03
申请号：JP3375392
申请日：1992-02-20
申请人： SONY CORP
发明人： KUDO HIROSHI , ARAI TAKEO , ITO JOTA , MATSUMURA SHINICHI
IPC分类号： G11B5/65 , G11B5/64 , G11B5/66
摘要： PURPOSE:To provide the magnetic recording medium with which good electro magnetic conversion characteristics, traveling property and durability can be assured even when this medium is applied to a system for which a non-tracking system is adopted. CONSTITUTION:Surface projections having >=40nm height from the center line average height are provided at a ratio of 2X10 to 10X10 pieces/mm and further, surface projections having >=2nm height at a ratio of 10X10 pieces/mm on the surface of the magnetic recording medium having a magnetic layer consisting of a magnetic metallic thin film on a nonmagnetic base. The possible method for forming such surface projections is a method of applying high- polymer particulates having prescribed grain sizes on the surface of the above- mentioned nonmagnetic base or internally adding fillers to the inside of the nonmagnetic base to control the surface characteristic of the nonmagnetic base and forming ruggedness on the surface of the above-mentioned magnetic layer, etc., by the laminar effect from the surface of such nonmagnetic base.

96. 发明专利

JPH05128517A MANUFACTURE OF MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH05128517A
公开(公告)日：1993-05-25
申请号：JP31017191
申请日：1991-10-30
申请人： SONY CORP
发明人： ITO JOTA , SAITO TOSHIHARU
IPC分类号： G11B5/85
摘要： PURPOSE:To prevent a nonmagnetic support body from being wrinkled by a method wherein a thermal load to which the nonmagnetic support body is subjected in a vapor deposition operation is relaxed. CONSTITUTION:When a magnetic layer composed of a ferromagnetic metal thin film is formed on a nonmagnetic support body 2 by a vacuum evaporation method, a mask 5 having an opening window 8 in the middle position of a region to be vapor-deposited is arranged and installed with reference to said nonmagnetic support body. At this time, the opening window 8 of said mask 5 is formed to be nearly a trapezoid or a shape equivalent to it, and the boundary between a region in which a magnetic material 7 is applied onto said nonmagnetic support body via the opening window 8 and a region to which the magnetic material 7 is not applied is formed so as to have a prescribed width.

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