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公开(公告)号：JPH11109010A
公开(公告)日：1999-04-23
申请号：JP26852597
申请日：1997-10-01
Applicant: HASEYAMA YOSHINORI , KUBOTA KK
Inventor： HASEYAMA YOSHINORI , MUKASA KOICHI , SUEOKA KAZUHISA , TAKEKUMA IKUKO , YASUI MASAHIKO , OKUMURA YOSHINOBU , AKITA KEN , MAEDA MAKOTO
Abstract: PROBLEM TO BE SOLVED: To evaluate the magnetic characteristics of a medium accurately. SOLUTION: A signal data is read out from a medium by means of a magnetic force microscope(MFM), a group of signal data thus obtained is regarded as a two-dimensional image and the statistical features thereof are extracted thus evaluating the magnetic characteristics of the medium. The evaluation method comprises a step for measuring the magnetization intensity at a specified interval by scanning an object with the probe of magnetic force microscope to acquire a signal data of m×n matrix, a step for recognizing the splitting direction of a region by regarding that the signal data belongs to an identical region if adjacent signals exist in a specified similar range, a step for grouping a signal data existing in the direction substantially i parallel with the splitting direction of the region, and a step for calculating the statistical features of each signal data group wherein the magnetic characteristics of an object are evaluated using the statistical features thus obtained as indexes.
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公开(公告)号：JPH1074620A
公开(公告)日：1998-03-17
申请号：JP22961796
申请日：1996-08-30
Applicant: KUBOTA KK
Inventor： OKUMURA YOSHINOBU , YASUI MASAHIKO , AKITA KEN , MAEDA MAKOTO
Abstract: PROBLEM TO BE SOLVED: To enhance coercive force and improve recording and reproducing characteristics, by provided a seed layer of a crystalline alloy composed of Ni, Cu and Cr at specified ratio between a medium substrate and a base layer. SOLUTION: A crystalline seed layer 3, a base layer 4, a magnetic layer 5 and a protective film 6, are formed in this order on a medium substrate 2 formed by forming a NiP layer 22 on a substrate 21 composed of an Al alloy or glass. The crystalline seed layer 3 is composed of a crystalline alloy with a composition of 36-46atom% of Ni, 0.5-6atom% of Cu and the rest being substantially Cr. The crystalline seed layer 3 is formed on the NiP layer 22 on the medium substrate 2 by sputtering in an atmosphere of inert gas, such as Ar gas, with negative bias voltage applied to the medium substrate 2. The NiP layer 22, the seed layer 3, the base layer 4, the magnetic layer 5 and the protective film 6 are formed on the other side of the substrate 21 symmetrically with respect to the substrate 21 so that writing and reading are feasible on both sides. This constitution enable increase of recording density.
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公开(公告)号：JPH09231558A
公开(公告)日：1997-09-05
申请号：JP3831896
申请日：1996-02-26
Applicant: KUBOTA KK
Inventor： MAEDA MAKOTO , YASUI MASAHIKO , HARA HIRONORI , INOUE NAOKI , KURATAKA NOBUO
Abstract: PROBLEM TO BE SOLVED: To prevent errors due to grooves and to improve the recording density of a magnetic recording medium by controlling the roughness of grooves appearing on the surface of a magnetic recording medium. SOLUTION: A NiP layer, a base layer, a magnetic layer and a protective film are formed by a well-known sputtering, plating or vacuum vapor deposition method. When the surface state of the magnetic recording medium satisfies the relation of formula 1, the surface has uniform and fine grooves with a small half width of the distribution of grooves compared to a conventional medium. Since deep grooves which are present in a conventional medium are not present in the distribution of this magnetic recording medium, errors caused by grooves during reproducing and writing can be prevented.
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公开(公告)号：JPH09212843A
公开(公告)日：1997-08-15
申请号：JP1870196
申请日：1996-02-05
Applicant: KUBOTA KK
Inventor： OKUMURA YOSHINOBU , YASUI MASAHIKO , AKITA KEN , MAEDA MAKOTO
Abstract: PROBLEM TO BE SOLVED: To obtain a high coercive force of magnetic recording medium and to decrease the interference of nonlinear waveforms by forming a seed layer comprising a crystalline Cr-Ni alloy between the medium substrate and a Cr base layer. SOLUTION: By forming a crystalline Cr-Ni alloy seed layer 3 between the medium substrate 2 and a Cr base layer 4, the crystalline state of the Cr base layer 4 becomes 110+211 orientation while the crystalline state of the Cr-alloy magnetic layer 5 becomes 100 orientation. Further, formation of a fine structure in a base layer 4 and a magnetic layer 5 formed on the crystalline Cr-Ni alloy seed layer 3 is promoted. Thus, by forming the 100 orientation of the crystal in the Cr-alloy magnetic layer 5 and a fine structure, high coercive force can be obtd. Even when the medium substrate 2 is subjected to texturing, the magnetic anisotropy in the magnetic layer 5 can be decreased by forming a seed layer 2 between the substrate and the Cr base layer.
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公开(公告)号：JPH09180150A
公开(公告)日：1997-07-11
申请号：JP23612896
申请日：1996-09-06
Applicant: KUBOTA KK
Inventor： OKUMURA YOSHINOBU , YASUI MASAHIKO , AKITA KEN , MAEDA MAKOTO
Abstract: PROBLEM TO BE SOLVED: To obtain a metallic this film type magnetic recording medium capable of simultaneously attaining the increase of coercive force and the reduction of medium noise. SOLUTION: An amorphous seed layer 3 of a Cr-Ni alloy is formed between a medium substrate 2 and each Cr underlayer 4. The Cr-Ni alloy is, e.g. an alloy consisting of 30-60at.% Ni, 4-10at.% at least one among W, Mo, Ta and Nb and the balance essentially Cr, an alloy consisting of 30-60at.% Ni,
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Patent Agency Ranking
公开(公告)号：JP2002343761A
公开(公告)日：2002-11-29
申请号：JP2001146372
申请日：2001-05-16
Applicant: KUBOTA KK
Inventor： MAEDA MAKOTO , ODAWA MASAHIRO , YAO MASAYUKI , INOUE NAOKI , KANDA MASAYUKI , HAYAKAWA YOSHITO , KUBOTA MASAMI , HARA HIRONORI
IPC: B08B5/00 , B08B7/00 , H01L21/304
Abstract: PROBLEM TO BE SOLVED: To reliably remove foreign objects, to improve the rate of foreign object removal, to prevent the foreign objects from adhering onto a substrate surface again, and to prevent an extremely small amount of scattering. SOLUTION: Compressed fluid is jetted to the outer edge of a spot P from first and second jet ports 38a and 40a of a nozzle 36, and is sprayed at a spraying angle α being smaller than 90 degrees. Each compressed fluid flows within the range of the spot P, and collides one another near the center between the first and second jet ports 38a and 40a. In addition, the compressed fluid that flows within the range of the spot P gives kinetic energy to foreign objects for supporting the peeling/floating of the foreign objects due to laser irradiation. Then, the foreign objects including extremely small ones that are subjected to the peeling/floating swim with the current of the compressed fluid. A suction port 42a is arranged ahead the flow of the compressed fluid that has collided, thus sucking the foreign objects to the suction port 42a with the compressed fluid by allowing suction force to operate.
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公开(公告)号：JPH10162340A
公开(公告)日：1998-06-19
申请号：JP31946296
申请日：1996-11-29
Applicant: KUBOTA KK
Inventor： OKUMURA YOSHINOBU , YASUI MASAHIKO , AKITA KEN , MAEDA MAKOTO
Abstract: PROBLEM TO BE SOLVED: To obtain a metallic thin film type magnetic recording medium excellent in magnetic characteristics and recording-reproducing characteristics. SOLUTION: A crystalline prelayer 3 is formed between each face of a medium substrate 2 and an underlayer 4. The prelayer 3 may have a compsn. consisting of 32-48at.% Co and the balance essentially Cr or a compsn. consisting of 32-48at.% Co, 0.5-3at.% at least one among W, Mo, Ta and Nb and the balance essentially Cr.
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公开(公告)号：JPH10105946A
公开(公告)日：1998-04-24
申请号：JP25431296
申请日：1996-09-26
Applicant: KUBOTA KK
Inventor： OKUMURA YOSHINOBU , YASUI MASAHIKO , AKITA KEN , MAEDA MAKOTO
Abstract: PROBLEM TO BE SOLVED: To reduce the effect of magnetic anisotropy in the peripheral direction of a magnetic layer by forming a crystalline seed layer having a specific composition between a medium substrate and a base layer. SOLUTION: In a metallic thin film type magnetic recording medium, the crystalline seed layer consisting of 36-48atom% Fe and the balance substantially Cr is formed between the medium substrate and the base layer. By forming the crystalline seed layer, the main crystal orientation of the Cr base layer formed thereon is improved and thereby the main crystal orientation of the Co alloy magnetic layer formed on the base layer is improved. And the crystal of the Cr base layer is micronized and thereby the crystal of the Co alloy magnetic layer is micronized. Thus, by improving the crystal orientation of the Co alloy magnetic layer and micronizing the crystal, the high coercive force of the magnetic recording medium and the decrease of the medium noise are simultaneously attained.
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公开(公告)号：JPH1021520A
公开(公告)日：1998-01-23
申请号：JP17484296
申请日：1996-07-04
Applicant: KUBOTA KK
Inventor： OKUMURA YOSHINOBU , YASUI MASAHIKO , AKITA KEN , MAEDA MAKOTO
Abstract: PROBLEM TO BE SOLVED: To obtain both of a high coercive force and high recording and reproducing characteristics, and to improve the recording density by forming an optimized seed layer between a medium substrate and a CrF base layer. SOLUTION: This recording medium 1 consists of NiP layers 22, seed layers 3, base layers 4, magnetic layers 5 and protective films 6, which are symmetrically formed as a substrate 21 to form such a structure that writing and reading can be performed on both surfaces. Or, these layers may be formed on only one surface so that writing and reading are performed on only one surface. The medium substrate 2 having NiP layers 22 formed may be subjected to texturing in the circumference direction so as to decrease friction between a head and the medium.
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公开(公告)号：JPH0714334A
公开(公告)日：1995-01-17
申请号：JP15075493
申请日：1993-06-22
Applicant: KUBOTA KK
Inventor： OKAWA YOJIRO , ONISHI SHUICHI , MAEDA MAKOTO
IPC: G11B21/21
Abstract: PURPOSE:To highly accurately measure a head floating amt. by preventing a light quantity from being changed due to a deviation of interference light. CONSTITUTION:Reflected light from a hard disk 1 and reflected light from a head 2 for reading and writing information on the hard disk 1 are led through their separate optical paths to one point to interfere with each other, and an intensity change of this interference light is measured, so that a floating amt. of the head 2 against the hard disk 1 is measured. In this head floating amt. measuring device for the hard disk, an optical system for expanding and contracting a light beam of reflected light is provided on at least one among the optical path for the reflected light A from the hard disk 1 and the optical path for the reflected light B from the head 2 in order to make one light beam out of the reflected light A and the reflected light B fall within the other light beam.
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