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公开(公告)号：GB2302980A
公开(公告)日：1997-02-05
申请号：GB9612880
申请日：1996-06-19
Applicant: KAO CORP
Inventor： KOBAYASHI ISAO , ISHII TAKASHI , UCHIDA KOJI
Abstract: A non-magnetic support has a plurality of protuberances 12. A magnetic layer 20 comprises a matrix of separate dots 18 of a material having an average crystal grain size a in the range 2-30 nm. The spacing x between the dots is between 0.2 nm and 30 nm and the dots are in the size range 30-400 nm. This arrangement is said to give reduced noise during high density recording.
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公开(公告)号：GB2302980B
公开(公告)日：1998-01-14
申请号：GB9612880
申请日：1996-06-19
Applicant: KAO CORP
Inventor： KOBAYASHI ISAO , ISHII TAKASHI , UCHIDA KOJI
Abstract: A non-magnetic support has a plurality of protuberances 12. A magnetic layer 20 comprises a matrix of separate dots 18 of a material having an average crystal grain size a in the range 2-30 nm. The spacing x between the dots is between 0.2 nm and 30 nm and the dots are in the size range 30-400 nm. This arrangement is said to give reduced noise during high density recording.
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公开(公告)号：JPH1134501A
公开(公告)日：1999-02-09
申请号：JP20789597
申请日：1997-08-01
Applicant: KAO CORP
Inventor： SUZUKI KOICHIRO , ONDA TOMOHIKO , KOBAYASHI ISAO
Abstract: PROBLEM TO BE SOLVED: To manufacture an optical recording medium having a high reflectance, a degree of modulation, and a mechanical strength. SOLUTION: For this optical recording medium 1, on the upper surface of a base plate 2, a first recording layer 3 comprising a metal of which the major component is In, a second recording layer 4 which is a metal or a non-metal including at least one kind of elements belonging to 5B group or 6B group of the periodic table, and a protective layer 5 are laminated in order. Then, on an area of the light recording medium 1, where a light beam for recording of a specified power is cast from the base plate 2 side, the first recording layer 3 and the second recording layer 4 form an alloy, and information signals are recorded.
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公开(公告)号：JPH09185816A
公开(公告)日：1997-07-15
申请号：JP31940295
申请日：1995-12-07
Applicant: KAO CORP
Inventor： KOBAYASHI ISAO
Abstract: PROBLEM TO BE SOLVED: To provide a magnetic recording medium having higher coercive force and higher SN ratio. SOLUTION: The ground surface layer of the magnetic recording medium 10 including a nonmagnetic substrate 12, the ground surface layer disposed on this nonmagnetic substrate 12 and a magnetic layer 14 consisting of a Co- contg. alloy disposed on the ground surface layer consists of >=2 layers of combined ground surface layers 13. The ground surface layer 20 on the nonmagnetic substrate 12 side is formed of a rare earth element or a material contg. >=50at.% rare earth element. The ground surface layer 22 on the side nearest the magnetic layer 14 is formed of Cr, W, Mo, Nb, V, Ta, Ti or Zr or a material contg. these elements at >=50at.%.
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公开(公告)号：JPH0944837A
公开(公告)日：1997-02-14
申请号：JP19757995
申请日：1995-08-02
Applicant: KAO CORP
Inventor： KOBAYASHI ISAO
Abstract: PROBLEM TO BE SOLVED: To obtain a magnetic recording medium having improved corrosion resistance without reducing coercive force. SOLUTION: This magnetic recording medium 10 has a nonmagnetic substrate 12 and a magnetic layer 14 disposed on the substrate 12 and the magnetic layer 14 is made of an alloy represented by the formula (where R is a rare earth metal other than Sm, 5 =a>=75at.%).
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Patent Agency Ranking
公开(公告)号：JPH08329465A
公开(公告)日：1996-12-13
申请号：JP13668995
申请日：1995-06-02
Applicant: KAO CORP
Inventor： KOBAYASHI ISAO
Abstract: PURPOSE: To obtain a magnetic recording medium having high coercive force and adaptable to high recording density with a Co-Sm-X alloy (X is Zr, Mo, Hf, Ta, W, Pt, Ti, V, Cr or Cu) as the material of a magnetic recording layer. CONSTITUTION: A film of Cr as an underlayer, a film of a Cox -Sm100-x-y -Xy alloy [(x) is 70-85at.%, (y) is 1-10at.% and x+y
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公开(公告)号：JPH08138243A
公开(公告)日：1996-05-31
申请号：JP27404994
申请日：1994-11-08
Applicant: KAO CORP
Inventor： KOBAYASHI ISAO
Abstract: PURPOSE: To reduce the magnetic interaction between magnetic grains and to obtain a magnetic recording medium having high coercive force and low noise by interposing nonmagnetic layers among magnetic layers. CONSTITUTION: A Cr underlayer is formed on a carbon substrate and magnetic layers of a Co-Ni-Cr alloy or a Co-Cr-Pt alloy and nonmagnetic layers of Cr are alternately laminated to form a magnetic recording layer. Heat treatment is then carried out at 300-700 deg.C in inert gas or in vacuum and a protective layer is formed on the recording layer.
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公开(公告)号：JPH08106633A
公开(公告)日：1996-04-23
申请号：JP23870194
申请日：1994-10-03
Applicant: KAO CORP
Inventor： KOBAYASHI ISAO , UCHIDA KOJI , ISHII TAKASHI
Abstract: PURPOSE: To obtain a medium having low noise and high recording density by forming a soft magnetic layer at 200 deg.C substrate temp. CONSTITUTION: The substrate 1 is, for example, an amorphous carbon substrate of 1.89 inch diameter which is subjected to precision polishing to Ra=0.5nm. After the carbon substrate is subjected to precision cleaning (alkali cleaning, rinsing and drying with hot pure water), films are formed and heat treatment is performed under specified conditions in a specified order in an in-line passing- type sputtering device to obtain a magnetic disk shown in the figure. The magnetic recording medium obtd. by this method shows large magnetic permeability of a soft magnetic layer, high coercive force of a perpendicular magnetic recording layer, and small dispersion of perpendicular magnetic anisotropy.
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公开(公告)号：JPH06349111A
公开(公告)日：1994-12-22
申请号：JP13741293
申请日：1993-06-08
Applicant: KAO CORP
Inventor： KOBAYASHI ISAO
Abstract: PURPOSE:To provide a recording medium excellent in recording and reproducing characteristics. CONSTITUTION:This recording medium has a carbon substrate, a recording film and a film of a metal selected among Ti, V, Cu, Zr, Nb, Mo, Ta and W or an alloy of such metals between the carbon substrate and the recording film.
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公开(公告)号：JPH06150302A
公开(公告)日：1994-05-31
申请号：JP29414892
申请日：1992-11-02
Applicant: KAO CORP
Inventor： KOBAYASHI ISAO , NAHATA YOSHIYUKI , KOKUBO ISAO
Abstract: PURPOSE:To uniformly and easily form fine ruggedness while maintaining high smoothness and to obtain a magnetic recording medium having high durability as well excellent recording and reproducing characteristics. CONSTITUTION:A magnetic thin film 2 of an alloy is formed on a nonmagnetic substrate to obtain the magnetic recording medium. Fine ruggedness due to the surface 3 of an aggregate of coarse crystal grains of the constituent components of the thin film is formed on the surface of the thin film.
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