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121. 发明专利

JPH06162502A PRODUCTION OF MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH06162502A
公开(公告)日：1994-06-10
申请号：JP30855092
申请日：1992-11-18
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： SUGITA RYUJI , TOMA KIYOKAZU , ISHIDA TATSURO , BAN YASUAKI
IPC分类号： C23C14/56 , G11B5/85
摘要： PURPOSE:To improve reproducing output and S/N by forming shielding plates for regulating the end part of film formation into a double or more structure and blowing oxygen out of the spacings between these shielding plates and between the shielding plate and a cylindrical can toward evaporated atoms. CONSTITUTION:The shielding plates for regulating the end part of the film formation consist of 3B and 3B' and are made into a double structure. The oxygen emitted therefrom passes the spacings between the shielding plates 3B and 3B' and between the shielding plate 3B' and the cylindrical can 2 and blows out toward the evaporated atoms 9. The optimization of the oxygen concn. distribution in the film thickness direction of the magnetic layer and the prevention of the infiltration of the evaporated atoms are simultaneously attained in such a case and, therefore, the magnetic tape having a high reproducing output and high S/N in a short wavelength region is obtd.

122. 发明专利

JPH05342563A 失效
公开(公告)号：JPH05342563A
公开(公告)日：1993-12-24
申请号：JP14404892
申请日：1992-06-04
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： GOTO YOSHIKI , ISHIDA TATSURO
IPC分类号： G11B5/72 , G11B5/64 , G11B5/73
摘要： PURPOSE:To provide a magnetic recording medium excellent in running property in a tape deck as a magnetic recording medium applied to the field of information industry, etc., by forming a lubricating layer on a magnetic recording medium having a protective layer of carbon on the thin film type magnetic layer and rubbing the lubricating layer. CONSTITUTION:A lubricating layer 4 is formed on a protective layer 3 of carbon formed by plasma CVD and the layer 4 is rubbed to improve the surface uniformity and properties as a coating film. The objective magnetic recording medium having improved running property in a tape deck independently of a change in environmental temp. or humidity and capable of ensuring a clear envelope over a long period of time is obtd.

123. 发明专利

JPH05342552A 失效
公开(公告)号：JPH05342552A
公开(公告)日：1993-12-24
申请号：JP14528392
申请日：1992-06-05
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： MAEZAWA KAJI , HONDA KAZUYOSHI , ISHIDA TATSURO
IPC分类号： G11B5/66 , G11B5/64 , G11B5/65 , G11B5/73 , G11B5/738 , G11B5/85
摘要： PURPOSE:To obtain the magnetic recording medium having excellent electromagnetic conversion characteristics and durable reliability by forming a nonmagnetic metal oxide contg. a ferromagnetic metal on a high-molecular film and laminating a magnetic layer consisting of the same metal as the ferromagnetic metal at a prescribed thickness on the surface thereof. CONSTITUTION:The high-molecular film 1 is set on a feed shaft 2 and is taken up by a take-up shaft 5 via cans 3, 4 and an intermediate roller 6. The magnetic metals 8 in ceramic crucibles 7 are melted by electron beams 10 from below. The nonmagnetic Co oxide layer is formed from the vapor flow of the Co of nearly perpendicular vapor deposition in an excessive oxygen atmosphere by the reactive vapor deposition of gaseous oxygen 9 on the film 1 and the oxide film of the Co-Ni is formed by oblique vapor deposition on the surface thereof. The oblique vapor deposition is executed by incident angles of 70 deg. high incident angle and 20 deg. low incident angle and the metal vapor flows unnecessary for the vapor deposition are respectively cut by masks 11. The magnetic layer consisting of the same metal as the ferromagnetic metal is then continuously laminated on the surface of the nonmagnetic metal oxide at a thickness of 2 to 20 times the thickness thereof.

124. 发明专利

JPH05159267A MAGNETIC RECORDING MEDIUM AND PRODUCTION OF THE MEDIUM 失效
公开(公告)号：JPH05159267A
公开(公告)日：1993-06-25
申请号：JP31769491
申请日：1991-12-02
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： SUGITA RYUJI , TOMA KIYOKAZU , KAWAWAKE YASUHIRO , ISHIDA TATSURO
IPC分类号： G11B5/66 , G11B5/64 , G11B5/65 , G11B5/85
摘要： PURPOSE:To provide a magnetic tape having a high regenerative output by forming first and second thin film magnetic layers respectively differring the rectangular rate of a lengthwise histeresis curve on a high polymer board. CONSTITUTION:On a traveling high polymer board 1, the evaporating atoms 9 are deposited while specifying incidental angles thetai and thetab to the high polymer board 1. Then, the first thin film magnetic layer is formed while setting the rectangular rate of the lengthwise histeresis curve from 0.65 to 0.85 and inclining the easy magnetizing axis to the normal of the film surface. Continuously, the second thin film magnetic layer is formed while setting the rectangular rate of the lengthwise histeresis curve from 0.45 to 0.65 and inclining the easy magnetizing axis to the normal of a film surface. Thus, the magnetic tape having the high regenerative output can be obtained.

125. 发明专利

JPH04222918A MAGNETIC RECORDING MEDIUM, ITS PRODUCTION, AND METHOD OF MAGNETIC RECORDING 失效
公开(公告)号：JPH04222918A
公开(公告)日：1992-08-12
申请号：JP40574990
申请日：1990-12-25
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： SUGITA RYUJI , TOMA KIYOKAZU , KAWAWAKE YASUHIRO , ISHIDA TATSURO
IPC分类号： G11B5/66 , G11B5/64 , G11B5/65 , G11B5/73 , G11B5/85
摘要： PURPOSE:To obtain a magnetic recording medium having high-density characteristics by providing a third magnetic layer essentially comprising Co, O2 in a manner that the axis of easy magnetization of the third magnetic layer inclines by a smaller angle from the normal line of the film plane than the axis of easy magnerization of a first and second magnetic layers essentially comprising Co, Cr; Co, O2, respectively. CONSTITUTION:The first magnetic layer 11 is formed by vaporized atoms passing through an aperture 18 during a polymer substrate 1 is traveled in the direction of an arrow 6. A shielding plate 3 is disposed between the vapor source 8 and cylindrical can 2. Vaporized atoms 9 passes through apertures 19, 20 of the shielding plate 3 and deposit on the polymer substrate 1'. By traveling the substrate 1' in the direction of an arrow 6, the second and third magnetic layers 12, 13 are formed with these vaporized atoms passing through the apertures 19, 20, respectively. In this process, the incident angle theta3i, theta3f at the starting position and finishing position for deposition of the magnetic layer 13, respectively, are determined so that the average incident angle of vaporized atoms for the magnetic layer 13 to the substrate is made smaller than the average incident angle of vaporized atoms to the substrate 1 in the forming area of magnetic layers 11, 12.

126. 发明专利

JPH04168626A MANUFACTURE OF MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH04168626A
公开(公告)日：1992-06-16
申请号：JP29572790
申请日：1990-10-31
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： TOMA KIYOKAZU , SUGITA RYUJI , HONDA KAZUYOSHI , KAWAWAKE YASUHIRO , ISHIDA TATSURO
IPC分类号： G11B5/84
摘要： PURPOSE:To strengthen adherence of a carbon layer to a magnetic layer and to improve durability by emitting ions and electrons from an ion gun to the surface of the magnetic layer immediately before the carbon layer is formed. CONSTITUTION:A polymer film 1 formed with a magnetic layer is fed along the periphery of a cylindrical can 2 in a direction of an arrow A. Ions and electrons 4 from an ion gun 3 are first emitted to the surface of the layer on the film 1 with the layer, and subsequently a carbon layer is formed by an evaporation source 5. In this case, the can 2 can be heated, and the temperature of the film 1 with the layer during depositing can be controlled. Thus, the adhesive properties of the carbon layer to the magnetic layer become rigid, and durability is improved.

127. 发明专利

JPH04168275A PRODUCTION OF THIN FILM 失效
公开(公告)号：JPH04168275A
公开(公告)日：1992-06-16
申请号：JP29572690
申请日：1990-10-31
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： TOMA KIYOKAZU , SUGITA RYUJI , HONDA KAZUYOSHI , KAWAWAKE YASUHIRO , ISHIDA TATSURO
IPC分类号： C23C14/56
摘要： PURPOSE:To suppress surface damage and to obtain a high-quality thin film by using rubber rolls as all of rolls which come in contact with the thin film forming surface of a polymer film and the surface of a thin film when this thin film is formed on the polymer film travelling along a cylindrical can. CONSTITUTION:When a thin film is formed by vacuum deposition on a polymer film 1 travelling along the peripheral surface of a cylindrical can 2, rubber rolls are used as all of rolls 7-14 which come in contact with the thin film forming surface of the polymer film 1 and the surface of the formed thin film. The rubber rolls are made of rubber contg. silicon or fluorine.

128. 发明专利

JPH04114314A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH04114314A
公开(公告)日：1992-04-15
申请号：JP23488590
申请日：1990-09-04
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： GOTO YOSHIKI , HONDA KAZUYOSHI , SHIMAZAKI YUKIHIRO , TOMA KIYOKAZU , KAWAWAKI YASUHIRO , SUGITA RYUJI , ISHIDA TATSURO
IPC分类号： G11B5/66 , C08L23/06 , C08L27/06 , C08L67/02 , C08L69/00 , C08L77/00 , C08L79/08 , G11B5/64 , G11B5/73 , G11B5/735
摘要： PURPOSE:To eliminate a transfer by providing a prescribed back coating layer on the back of a non-magnetic base plate, thereby roughening the surface of the back coating layer, and improving travelling safety and wear resistance. CONSTITUTION:On the surface of the non-magnetic base plate 1, a magnetic layer 2 which consists of an alloy or metallic oxide incorporating Cobalt(Co) is provided, and on the back of the non-magnetic base plate 1, the back coating layer 3 incorporating polyurethan, nitro-cellulose, isocyanate hardener, lubricant, grinding material and 3 or more carbons having different average granular diameters is provided. Since the surface of the back coating layer is roughened in such a manner, the contact where the posts and guiding members in the magnetic recording medium device come into contact with each other during travelling is improved.

129. 发明专利

JPH0386914A MAGNETIC RECORDING MEDIUM, ITS PRODUCTION AND METHOD OF MAGNETIC RECORDING 失效
公开(公告)号：JPH0386914A
公开(公告)日：1991-04-11
申请号：JP22356289
申请日：1989-08-30
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： SUGITA RYUJI , TOMA KIYOKAZU , HONDA KAZUYOSHI , KAWAWAKE YASUHIRO , ISHIDA TATSURO
IPC分类号： G11B5/66 , G11B5/02 , G11B5/64 , G11B5/65 , G11B5/85
摘要： PURPOSE:To obtain a medium having no dipulse in the isolated reproduction waveform but narrow pulse width by forming each specified first and second magnetic layers. CONSTITUTION:On a polymer substrate 1, there are formed the first magnetic layer essentially comprising Co and the second magnetic layer essentially comprising Co. Magnetization direction in the first magnetic layer 2 and the second magnetic layer 3 for recording makes an angle from the normal line 4 of the film surface. Magnetization direction 5 of the magnetic layer 2 and magnetization direction 6 of the second magnetic layer 3 are the axes of easy magnetization of the respective layers, opposite to each other for the normal line 4. When the data recorded by this method is reproduced with a ring-type magnetic head, the obtd. signals have narrow pulse width with little subpulses.

130. 发明专利

JPH0337827A PRODUCTION OF MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH0337827A
公开(公告)日：1991-02-19
申请号：JP17223389
申请日：1989-07-03
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： KAWAWAKE YASUHIRO , SUGITA RYUJI , TOMA KIYOKAZU , HONDA KAZUYOSHI , ISHIDA TATSURO
IPC分类号： G11B5/84
摘要： PURPOSE:To form a medium surface which is resistant to flawing and to improve durability and traveling property by forming steep and hard uniform ruggedness of an oxide on the medium surface. CONSTITUTION:A high-polymer film 1 travels along the peripheral surface of a cylindrical can 2 and the atoms evaporated from a vapor deposition source 5 pass a slit S and forms a thin film on the surface of the film 1 on the peripheral surface of the can 2. The surface of this thin film is etched by the ions 8 released from an ion gun 7 applied with 500V acceleration voltage. The ruggedness is formed on the surface of the thin-film magnetic layer consisting of the Co-Cr when the surface is ion-etched. CoO grows on the surface and the ruggedness on the surface increases further and the hardness increases when the surface of the thin-film magnetic layer consisting of the Co-Cr is oxidized at a high temp. in the atmosphere.

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