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51. 发明专利

JPH08147679A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH08147679A
公开(公告)日：1996-06-07
申请号：JP31594594
申请日：1994-11-25
申请人： KONISHIROKU PHOTO IND
发明人： GOTO SHIGETO
IPC分类号： G11B5/716 , C09D5/23
摘要： PURPOSE: To enhance a property of travel motion by making the average major axis length La of a ferromagnetic metal powder contained in an upper layer within the range of 50 to 220nm making the average moor axis length Lb of the ferromagnetic powder contained in a lower layer within the range of 220 to 500nm and making 20

52. 发明专利

JPH07254133A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH07254133A
公开(公告)日：1995-10-03
申请号：JP4593694
申请日：1994-03-16
申请人： KONISHIROKU PHOTO IND
发明人： GOTO SHIGETO
IPC分类号： G11B5/716 , C09D5/23 , C09D7/12 , G11B5/738
摘要： PURPOSE:To obtain a magnetic recording medium excellent in electrical characteristics and running performance and suitable for use as a digital recording medium as well as to improve surface properties of the magnetic recording medium. CONSTITUTION:At least a 1st nonmagnetic layer (1st layer), a 2nd nonmagnetic layer or a magnetic layer (2nd layer) and a magnetic layer (3rd layer) are successively formed on a substrate 1. The 1st, 2nd and 3rd layers contain alpha-alumina or Cr2O3 and the relations of A>B and 10

53. 发明专利

JPH07220265A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH07220265A
公开(公告)日：1995-08-18
申请号：JP784394
申请日：1994-01-27
申请人： KONISHIROKU PHOTO IND
发明人： GOTO SHIGETO
IPC分类号： G11B5/708 , C09D5/23 , C09D7/12 , G11B5/714 , G11B5/716 , G11B5/73 , G11B5/738 , G11B5/704
摘要： PURPOSE:To obtain a magnetic recording medium excellent in such characteristics as RF output, chroma output, running durability and still durability at high temp. and humidity or low humidity and suitable for use as a digital recording medium. CONSTITUTION:At least 1st, 2nd, 3rd and 4th layers are successively formed on a substrate. When the particle diameter (average particle diameter in the case of spherical particles or average major axis size in the case of acicular particles) of a filler contained by the largest weight among all fillers in the 1st layer, that in the 2nd layer, that in the 3rd layer and that in the 4th layer are represented by A (nm), B (nm), C (nm) and D (nm), respectively, the 4th layer is a magnetic layer and the relations of A> B and C>D are satisfied. When the crystallite size of a filter contained by the largest weight among all fillers in the 1st layer, that in the 2nd layer, that in the 3rd layer and that in the 4th layer are represented by (a) (nm), (b) (nm), (c) (nm) and (d) (nm), respectively, the 4th layer is a magnetic layer and the relations of a>b and c>d are satisfied.

54. 发明专利

JPH07176039A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH07176039A
公开(公告)日：1995-07-14
申请号：JP14144891
申请日：1991-05-17
申请人： KONISHIROKU PHOTO IND
发明人： GOTO SHIGETO , SEKIGUCHI NOBUYUKI
IPC分类号： G11B5/708 , G11B5/70 , G11B5/714 , G11B5/716
摘要： PURPOSE:To prevent the surface roughening of magnetic layers by regulating the total thickness of plural magnetic layers to a specified mum or below and the thickness of a magnetic layer as the outermost layer to a specified mum or below in a magnetic recording medium obtd. by laminating plural magnetic layers on a substrate. CONSTITUTION:This magnetic recording medium has plural magnetic layers 2, 4 laminated on one side of the substrate 1 and a back coat layer 3 on the other side. The total thickness of the magnetic layers 2, 4 is

55. 发明专利

JPH05298664A 失效
公开(公告)号：JPH05298664A
公开(公告)日：1993-11-12
申请号：JP12003992
申请日：1992-04-14
申请人： KONISHIROKU PHOTO IND
发明人： GOTO SHIGETO , SASAKI KUNITSUNA
IPC分类号： G11B5/70 , C09D5/23 , C09D127/04 , C09D127/06 , C09D175/00 , C09D175/04 , G11B5/702 , G11B5/73 , G11B5/738
摘要： PURPOSE:To provide a magnetic recording medium ensuring high C/N ratio and overwriting characteristics necessary for use as a digital recording medium and excellent in running durability at high temp. and humidity. CONSTITUTION:Plural layers are formed on a nonmagnetic substrate. The thickness of the uppermost magnetic layer is

56. 发明专利

JPH05298663A 失效
公开(公告)号：JPH05298663A
公开(公告)日：1993-11-12
申请号：JP12003892
申请日：1992-04-14
申请人： KONISHIROKU PHOTO IND
发明人： GOTO SHIGETO , SASAKI KUNITSUNA
IPC分类号： G11B5/70 , C09D5/23 , C09D175/00 , C09D175/04 , G11B5/702 , G11B5/73 , G11B5/738
摘要： PURPOSE:To provide a magnetic recording medium having high C/N ratio and overwriting characteristics necessary for sue as a digital recording medium and excellent in corrosion resistance at high temp. and humidity and in an NO2-contg. environment. CONSTITUTION:Plural layers are formed on a nonmagnetic substrate. The thickness of the uppermost magnetic layer is

57. 发明专利

JPH05290359A 失效
公开(公告)号：JPH05290359A
公开(公告)日：1993-11-05
申请号：JP9294992
申请日：1992-04-13
申请人： KONISHIROKU PHOTO IND
发明人： GOTO SHIGETO , ISOBE RYOSUKE
IPC分类号： G11B5/70 , C09D5/23 , C09D7/12 , G11B5/714 , G11B5/73 , G11B5/738 , G11B5/842
摘要： PURPOSE:To obtain a magnetic recording medium having satisfactory electromagnetic transducing characteristics and overwriting characteristics by forming a magnetic recording layer consisting of plural constituent layers on a nonmagnetic substrate and incorporating ferromagnetic metal powder having prescribed characteristics into the upper magnetic layer of the magnetic recording layer. CONSTITUTION:A magnetic recording layer consisting of plural constituent layers is formed on a nonmagnetic substrate. The upper layer of the magnetic recording layer is a magnetic layer contg. ferromagnetic metal powder having

58. 发明专利

JPH05250653A 失效
公开(公告)号：JPH05250653A
公开(公告)日：1993-09-28
申请号：JP20321991
申请日：1991-07-19
申请人： KONISHIROKU PHOTO IND
发明人： GOTO SHIGETO , SUNAGA TETSURO , YASUFUKU YOSHITAKA
IPC分类号： G11B5/70 , C09D5/23 , C09D175/00 , C09D175/04 , G11B5/702
摘要： PURPOSE:To obtain a magnetic recording medium having high output and excellent S-N ratio by incorporating urethane resin having a yield point and magnetic metal powder into a magnetic layer and limiting the average surface roughness of the magnetic layer. CONSTITUTION:Urethane resin having a yield point and magnetic metal powder are incorporated into a magnetic layer 2 on a substrate 1 and the average surface roughness of the magnetic layer 2 is regulated to

59. 发明专利

JPH05217151A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH05217151A
公开(公告)日：1993-08-27
申请号：JP2018292
申请日：1992-02-05
申请人： KONISHIROKU PHOTO IND
发明人： KOYAMA NOBORU , GOTO SHIGETO
IPC分类号： G11B5/706 , C09D5/23 , C09D127/04 , C09D127/06 , C09D175/00 , C09D175/04 , G11B5/714 , G11B5/716
摘要： PURPOSE:To achieve the excellent high-pass characteristic and the excellent weatherproofness of the medium and to obtain the good overwrite characteristic of the medium by a method wherein the uppermost layer contains a specific ferromagnetic alloy powder, its thickness is specific and its adjacent layer contains a high-permeability material. CONSTITUTION:A magnetic layer at the uppermost layer for a magnetic recording medium provided with a plurality of layers contains a ferromagnetic alloy powder, as a main component, whose average long-axis length by means of a transmission electron microscope is less than 0.30mum and whose crystal lattice size by means of an X-ray diffraction method is less than 300Angstrom ; its layer thickness is 0.8mum or lower. At least one layer other than the uppermost layer contains a high-permeability material. Thereby, it is possible to obtain the magnetic recording medium whose signal overwrite characteristic is good and whose weatherproofness is excellent.

60. 发明专利

JPH05151557A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH05151557A
公开(公告)日：1993-06-18
申请号：JP31081491
申请日：1991-11-26
申请人： KONISHIROKU PHOTO IND
发明人： GOTO SHIGETO , SEKIGUCHI NOBUYUKI
IPC分类号： G11B5/708 , C09D5/23 , C09D127/04 , C09D127/06 , C09D175/00 , C09D175/04 , G11B5/716
摘要： PURPOSE:To provide the magnetic recording medium which is small in the coefft. of friction and prevents the degradation in RF output under a low humidity and the generation of jitters under a high temp. and high humidity by incorporating nonmagnetic powder having prescribed characteristics, etc., into the uppermost layer of plural constituting layers. CONSTITUTION:The magnetic recording medium is constituted by providing the plural constituting layers on a nonmagnetic base and incorporating the nonmagnetic powder having =6 Mohs scale into the uppermost layer thereof and the nonmagnetic powder having 0.15 to 0.30mum average grain sizes and having >=6 Mohs scale into at least one layer exclusive of the uppermost layer. The surface of the uppermost layer has the preferable surface roughness coupled with the effect of the polishing agent which is the nonmagnetic powder incorporated into the layers exclusive of the uppermost layer. In addition, the necessarily sufficiently smooth surface is obtd. The degradation in the RF output under the low humidity and the generation of the jitters under the high temp. and high humidity are thus prevented.

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