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公开(公告)号：CA2217253A1
公开(公告)日：1998-04-08
申请号：CA2217253
申请日：1997-10-02
Applicant: SONY CORP
Inventor： OSUMI HIROSHI , YAMADA HIROYUKI , KATAGIRI HIDEO , TAKEDA TSUTOMU , CHIBA KAZUNOBU
Abstract: The quantity of impurities in a magnetic material is decreased to produce a magnetic material with good quality, and a decrease in the cost of the magnetic material is realized by desulfurization. A magnetic raw material for metallic thin film magnetic recording media which contains sulfur more than 20 ppm is desulfurized to obtain the magnetic material for metallic thin film magnetic recording media with the sulfur content adjusted to 20 ppm or below, and a metallic thin film magnetic recording medium having a magnetic layer vaporized thereon with the magnetic material is fabricated.
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公开(公告)号：DE69613729T2
公开(公告)日：2002-05-08
申请号：DE69613729
申请日：1996-02-22
Applicant: SONY CORP
Inventor： CHIBA KAZUNOBU , ITO JOTA , TAKEDA TSUTOMU , MATSUMURA SHINICHI
Abstract: A base film for a magnetic recording medium including one surface, on which a magnetic layer can be formed, having a surface roughness of center line average roughness Ra of 10 nm or less, a ten-point average roughness Rz of 80 nm or less and a maximum height Rmax of 150 nm or less. The base film includes the other surface having a surface roughness of center line average roughness Ra of 4.5 to 20 nm, a ten-point average roughness Rz of 35 to 350 nm and a maximum height Rmax of 40 to 400 nm.
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公开(公告)号：DE69613729D1
公开(公告)日：2001-08-16
申请号：DE69613729
申请日：1996-02-22
Applicant: SONY CORP
Inventor： CHIBA KAZUNOBU , ITO JOTA , TAKEDA TSUTOMU , MATSUMURA SHINICHI
Abstract: A base film for a magnetic recording medium including one surface, on which a magnetic layer can be formed, having a surface roughness of center line average roughness Ra of 10 nm or less, a ten-point average roughness Rz of 80 nm or less and a maximum height Rmax of 150 nm or less. The base film includes the other surface having a surface roughness of center line average roughness Ra of 4.5 to 20 nm, a ten-point average roughness Rz of 35 to 350 nm and a maximum height Rmax of 40 to 400 nm.
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公开(公告)号：JP2002334421A
公开(公告)日：2002-11-22
申请号：JP2001140525
申请日：2001-05-10
Applicant: SONY CORP
Inventor： TAKEDA TSUTOMU , UCHIUMI TOSHIHARU , OGASAWARA MAYUMI
IPC: C10M105/54 , C10M107/38 , C10M107/44 , C10N30/00 , C10N30/06 , C10N30/08 , C10N40/18 , G11B5/64 , G11B5/72 , G11B5/725
Abstract: PROBLEM TO BE SOLVED: To improve durability and running speed of a magnetic recording medium of a metal magnetic thin film type. SOLUTION: In the magnetic recording medium 10 constructed by successively forming a magnetic layer 2 composed of a ferromagnetic metal thin film and a carbon protective film 3 on a nonmagnetic supporting body 1, the surface of the carbon protective layer 3 is plasma treated and the protective layer 3 retains a lubricant formed by combining a compound of perfluoropolyether having a terminal carboxyl group with an amine and an alkyl ester of a partially fluorinated carboxylic acid.
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公开(公告)号：JPH10320771A
公开(公告)日：1998-12-04
申请号：JP13137997
申请日：1997-05-21
Applicant: SONY CORP
Inventor： TAKEDA TSUTOMU , YATAGAI HIROSHI
Abstract: PROBLEM TO BE SOLVED: To enhance the orientation property of a magnetic thin film by preliminarily applying a heat-treatment by a microwave to a non-magnetic substrate before forming a magnetic thin film on the non-magnetic substrate, thereby suppressing the released gas from the non-magnetic body due to heat of the vapor deposition of the magnetic thin film. SOLUTION: A heat-treatment by the microwave is applied to a non-magnetic substrate 3 before a magnetic thin film is formed on the substrate by arranging a heating furnance 14 in a vacuum room 1 forming the magnetic thin film. The non-magnetic substrate 3 delivered from a feed roll 4 passes through the heating furnance 14 before it reaches a cooling can 8. The heat-treatment by the microwave is applied with respect to the non-magnetic substrate 3 by the microwave heater 14a arranged in the heating furnance 14. At this time, the output of the microwave heater 14a is important and the output of the heater is preferably >=100 W/m sec. and sec. by considering the roll width and the running speed of the non-magnetic substrate 3. Thus, a sufficient degassing effect is obtained without impairing the surface property of the non- magnetic substrate 3 by performing the heat-treatment within this output range.
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Patent Agency Ranking
公开(公告)号：JPH10116749A
公开(公告)日：1998-05-06
申请号：JP26740296
申请日：1996-10-08
Applicant: SONY CORP , DAIDO STEEL CO LTD
Inventor： CHIBA KAZUNOBU , TAKEDA TSUTOMU , YAMADA HIROYUKI , KATAGIRI HIDEO , OSUMI HIROSHI
Abstract: PROBLEM TO BE SOLVED: To suppress missing or drop out of magnetic layer due to splash at the time of deposition by desulfurizing a magnetic material having high content of sulfur thereby decreasing the content of sulfur to a specified value or below. SOLUTION: A magnetic material tar metal thin film magnetic recording medium containing sulfur by 20ppm or more is desulfurized at the time of vacuum dissolution by adding a desulfurization agent to prepare a magnetic material containing sulfur by 20ppm or less. This material can suppress missing or drop out of magnetic layer due to splash at the time of deposition. For example, a magnetic material of 99% Co is desulfurized using carbon in an alloy material dissolved at the time of vacuum dissolution and cooled temporarily before cutting off scale adhering to the surface of the magnetic material by machining. It is subjected again to vacuum dissolution where desulfurization is performed by throwing in a mixture of equal quantity of CAF2 and CaO. According to the method characteristics equivalent to the case employing Co 99.9% material are attained and the cost is reduced significantly.
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7.发明专利
公开(公告)号：JPH1011745A
公开(公告)日：1998-01-16
申请号：JP16452696
申请日：1996-06-25
Applicant: SONY CORP
Inventor： TAKEDA TSUTOMU
Abstract: PROBLEM TO BE SOLVED: To remove powder dust, etc., by bringing a first polishing tape traveling in the forward direction with respect to the traveling direction of a medium at a speed higher than the speed of the medium into sliding contact with the medium, then bringing a second polishing tape traveling backward with respect to the traveling direction of the medium into sliding contact with the medium. SOLUTION: The surface of the magnetic thin film of a continuously traveling raw medium 2 is first brought into sliding contact with the first polishing tape 1 at the time of passing a first polishing means 3. As a result, the powder dust of a relatively large diameter of the powder dust sticking to the surface of the magnetic thin film is rapidly polished and is removed to the traveling direction side of the raw medium 2. The raw medium 2 past the means 3 passes a second polishing means 5. At this time, the surface of the magnetic thin film is brought into sliding contact with the tape 4 and the powder dust of a relatively small diameter which tends to be the cause of a drop-out is removed from the surface of the thin film. At this time, the powder dust of the relatively large diameter which is the cause for flawing is already removed at the time of passing the means 3 and, therefore, the raw medium is polished without the occurrence of scratching flaws and the good magnetic layer surface is obtd.
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公开(公告)号：JPH104014A
公开(公告)日：1998-01-06
申请号：JP15711896
申请日：1996-06-18
Applicant: SONY CORP
Inventor： CHIBA KAZUNOBU , TAKEDA TSUTOMU
Abstract: PROBLEM TO BE SOLVED: To obtain a magnetic recording medium which is excellent in electromagnetic conversion characteristics, having less dropouts, and small in error rate by a method wherein an amount of material used as deoxidizer and left in metal magnetic material is set smaller than a specific value. SOLUTION: Metal magnetic material as material is melted by heating by a high-frequency induction coil, and deoxidizer such as Al, Si or C is added. In this case, a period of melting time is set corresponding to dioxidizer to be used, and an introduction of deoxidizer is repeated little by little so as to adjust the amount of deoxidizer contained in the magnetic material, whereby the amount of deoxidizer residual in metal magnetic material is set at 0.06wt.% or lower. Thereby the electromagnetic conversion characteristics of a magnetic recording medium is enhanced made to have fewer dropouts, less deteriorated in magnetic characteristics and error rate is reduced and manufacturing yield is improved.
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公开(公告)号：JPH09228029A
公开(公告)日：1997-09-02
申请号：JP3481296
申请日：1996-02-22
Applicant: SONY CORP
Inventor： CHIBA KAZUNOBU , ITO JOTA , TAKEDA TSUTOMU
IPC: C23C14/14
Abstract: PROBLEM TO BE SOLVED: To provide a production method of a magnetic recording medium having excellent electromagnetic conversion characteristics and magnetic characteristics and a small error rate by using Co as the vapor deposition source. SOLUTION: In the production method of a magnetic recording medium by forming a ferromagnetic metal thin film as a magnetic layer by vacuum vapor deposition on a nonmagnetic base body, Co is used as the vapor deposition source material. The ferromagnetic metal thin film is formed on a nonmagnetic base body by specifying the total amt. of C, Si, Mn, Al and Ti in the vapor deposition source material to
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公开(公告)号：JPH0995777A
公开(公告)日：1997-04-08
申请号：JP27693095
申请日：1995-09-29
Applicant: SONY CORP
Inventor： ITO JOTA , CHIBA KAZUNOBU , TAKEDA TSUTOMU , SUZUKI TOSHIAKI
Abstract: PROBLEM TO BE SOLVED: To prevent an influence due to an abnormal bumping called a splash at the time of a vapor deposition and to prevent a generation of a drop-out of a magnetic recording medium to be produced. SOLUTION: A length H1 of a crucible 19 is made longer than a width H2 of a cooling can 16. A material supply port 5 supplying a magnetic material 20 in a position which is deviated from the cooling can of the crucible is provided, and also a partition plates 1 (1A and 1B) dividing a material supplying area 2A in the crucible and a cooling can opposite area 2B are provided.
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