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公开(公告)号：JPH0973621A
公开(公告)日：1997-03-18
申请号：JP22561695
申请日：1995-09-01
Applicant: KAO CORP
Inventor： SHIGA AKIRA , IMAMURA HIDEKI , MIZUNOYA HIROHIDE
Abstract: PROBLEM TO BE SOLVED: To provide a metallic thin film type magnetic recording medium with which equiv. reproduced output is obtainable even if this recording medium is made to travel in both forward and backward directions. SOLUTION: The magnetic metal 5 in a crucible 4 is melted and evaporated by heating with the electron beam from an electron gun 8 and a lower magnetic film 11a of columns diagonally grown to a thickness of 500 to 1500Å is formed on a base 3 in the position of a cooling can roll 1. After the lower magnetic film 11a is taken up on a taking-up side roll 2b, this roll is set on a supply side and the base is made to travel in the same direction. An upper magnetic film 11b of a thickness of 500 to 1000Å is then formed on this lower magnetic film 11a in the position of the cooling can roll 1. The magnetic films are provided with a protective film 12 of a thickness of 50 to 200Å consisting of diamond-like carbon, etc., at need. The magnetic films are specified to >=0.65 in the min. value/max. value of the coercive force obtd. at the time the impressed magnetic field angle of the magnetic field impressed in the longitudinal direction of the magnetic recording medium is varied from 0 to 180 deg..
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公开(公告)号：JPH0963795A
公开(公告)日：1997-03-07
申请号：JP22053295
申请日：1995-08-29
Applicant: KAO CORP
Inventor： SASAKI KATSUMI , KITAORI NORIYUKI , YOSHIDA OSAMU , MIZUNOYA HIROHIDE , MATSUO YUZO , SHIGA AKIRA , ISHIKAWA JUNKO
IPC: H05H1/46 , C23C16/27 , C23C16/50 , C23C16/511 , C30B25/14 , H01L21/205
Abstract: PROBLEM TO BE SOLVED: To easily form the excellent film, which can cope with the uniformity and variety of a film chamber, by providing an opening of a gas leading tube, which leads the gas into a plasma exciting chamber, on the center line of an amplitude of the micro wave. SOLUTION: In this ECR plasma CVD device, a part of a gas leading tube 15 is arranged on the center line of the amplitude of the micro wave inside of a waveguide 11, and the gas leading tube 15 is connected to a window 14. Consequently, in comparison with the conventional device with the structure that the raw material gas is led to the end of a plasma exciting chamber, this device has an opening, which can lead the raw material gas to the center of the plasma exciting chamber. The window 14 made of the material, which passes the microwave, as a quartz glass is integrally formed with the leading tube 15. Inside of the leading tube 15 is formed hollow. The leading tube 15 is desirably positioned at the center of the waveguide 11 in the microwave progressing direction. A joint part of the window 14 and the leading tube 15 needs the strength enough for standing with a pressure difference between inside and outside of the plasma exciting chamber.
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公开(公告)号：JPH0963034A
公开(公告)日：1997-03-07
申请号：JP21480695
申请日：1995-08-23
Applicant: KAO CORP
Inventor： SHIGA AKIRA , MIZUNOYA HIROHIDE , IMAMURA HIDEKI
Abstract: PROBLEM TO BE SOLVED: To obtain a magnetic recording medium having satisfactory running performance by forming a magnetic layer on one side of a substrate and a back coating layer having a prescribed compsn. on the other side. SOLUTION: This magnetic recording medium has a substrate, a magnetic layer formed on one side of the substrate and a back coating layer formed on the other side. The back coating layer is made of βSiC. This back coating layer of β-SiC is formed by producing cubic β-SiC by sputtering using Si or SiC as a target material and Ar+C2 H2 or Ar+CH4 as a sputtering gas but a method for forming the back coating layer is not limited to the sputtering method. This magnetic recording medium ensures a satisfactory touch with a head, and even if a lubricant is diminished, satisfactory running performance can be maintained because the β-SiC layer is excellent in lubricity.
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公开(公告)号：JPH0954948A
公开(公告)日：1997-02-25
申请号：JP20211395
申请日：1995-08-08
Applicant: KAO CORP
Inventor： MIZUNOYA HIROHIDE , SHIGA AKIRA , IMAMURA HIDEKI
Abstract: PROBLEM TO BE SOLVED: To produce a magnetic recording medium contg. a small amt. of impurities in the magnetic layer and having a relatively high percentage of effective magnetic particles. SOLUTION: When an iron-base magnetic layer is formed on a running base film 4 by ion assisted vapor deposition or other method, an attained degree of vacuum (1st degree of vacuum) is regulated to =95% partial pressure of gaseous N2 and then a magnetic layer of iron nitride is formed.
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公开(公告)号：JPH0954933A
公开(公告)日：1997-02-25
申请号：JP20415395
申请日：1995-08-10
Applicant: KAO CORP
Inventor： MIZUNOYA HIROHIDE , SHIGA AKIRA , IMAMURA HIDEKI
Abstract: PROBLEM TO BE SOLVED: To improve the overwriting (O.W.) characteristics by controlling the coercive force of a metallic magnetic thin film on a supporting body in such a manner that when the angle of a magnetic field applied in the longitudinal direction is changed from 0 deg. to 180 deg., the ratio of the max. coercive force to the coercive force at 0 is a specified value or smaller during the coercive force changes from the value at 0 deg. to the min. SOLUTION: A metallic magnetic thin film, a protective film and a lubricant film are successively formed on one surface of a supporting body, and a back coating film is formed on the other side to obtain a magnetic recording medium. When a magnetic field is applied along the longitudinal direction and the angle of the magnetic field applied is changed from 0 deg. to 180 deg., the coercive force of the magnetic film shows the max. B and C in 30 deg. to 60 deg. region and 80 deg.-120 deg. region, respectively, and the min. D in 50 deg. to 80 deg. region. The ratio of the max. B to the coercive force (A) at 0 deg. is controlled to >=1.3. To obtain this ratio, the magnetic film is formed to 2000Å thickness by melting and vaporizing Co and depositing on the supporting body such as PET by electron beam heating. Thereby, even when the coercive force is increased to obtain high output, low output and high C/N, overwriting characteristics (O, W) can be improved.
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Patent Agency Ranking
公开(公告)号：JPH0935260A
公开(公告)日：1997-02-07
申请号：JP18176795
申请日：1995-07-18
Applicant: KAO CORP
Inventor： SASAKI KATSUMI , KITAORI NORIYUKI , YOSHIDA OSAMU , MIZUNOYA HIROHIDE , MATSUO YUZO , SHIGA AKIRA , ISHIKAWA JUNKO
IPC: G01N3/56 , G11B5/00 , G11B5/84 , G11B15/02 , G11B15/467
Abstract: PROBLEM TO BE SOLVED: To provide a magnetic tape durability testing device small in size, simple in structure, easy to use and capable of shortening the testing/evaluating time by providing a rotating drum means, a pin means and an observing means of the edge of magnetic tape. SOLUTION: A rotating drum means 1 whose trunk part 4 is in pressurized contact with a magnetic tape 5 is rotatable in forward and backward directions A, movable in the vertical direction B and the lower edge face of the magnetic tape 5 is slid on the end face 7 of a flange part 9. A regulating pin 2 is fixed on a board 8 and arranged on both sides of the rotating drum 1 while alternately changing its position of the flange part 9. An observing means of the edge of magnetic tape 3 is composed of a stroboscope 11 and an optical microscope 12 and observes the state of the edge of the magnetic tape. The traveling condition of the magnetic tape is easily changed by setting a traveling speed, a number of pins, etc., and the testing/evaluating time is shortened. The device small in size, simple in structure and easy to use is obtained.
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公开(公告)号：JPH0935235A
公开(公告)日：1997-02-07
申请号：JP18033495
申请日：1995-07-17
Applicant: KAO CORP
Inventor： YOSHIDA OSAMU , KITAORI NORIYUKI , MIZUNOYA HIROHIDE , SASAKI KATSUMI , MATSUO YUZO , SHIGA AKIRA , ISHIKAWA JUNKO
Abstract: PROBLEM TO BE SOLVED: To provide a magnetic recording medium having further improved durability and oxidation resistance, especially a magnetic recording medium with a magnetic layer based on iron and contg. nitrogen or carbon. SOLUTION: A magnetic layer contg. iron and nitrogen or carbon, e.g. an Fe-N-O magnetic layer 2 is formed on a substrate 1 by an ion assist physical vapor deposition method in a vacuum atmosphere. A nickel layer 3 is formed on the magnetic layer 2 by a physical vapor deposition method.
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公开(公告)号：JPH0935233A
公开(公告)日：1997-02-07
申请号：JP17478795
申请日：1995-07-11
Applicant: KAO CORP
Inventor： YOSHIDA OSAMU , KITAORI NORIYUKI , MIZUNOYA HIROHIDE , SASAKI KATSUMI , MATSUO YUZO , SHIGA AKIRA , ISHIKAWA JUNKO
Abstract: PROBLEM TO BE SOLVED: To improve the film forming rate and to enhance the corrosion resistance of a magnetic recording medium by forming a semiconductor layer on a substrate, heating the semiconductor layer, and then forming an iron nitride magnetic layer thereon. SOLUTION: A semiconductor layer is formed on a polyethylene terephthalate substrate, then the semiconductor layer is heated, and a magnetic layer using an iron nitride magnetic material is formed on the heated semiconductor layer. The production method includes the following processes. When the substrate consists of a base film such as polyethylene terephthalate(PET) which is stretched along the longitudinal direction, the base film 6 of the substrate is continuously carried from a vacuum chamber 1 to a vacuum chamber 2. The semiconductor layer is formed by vapor deposition in the vacuum chamber 1, and the magnetic layer is formed by ion assisted vapor deposition in the vacuum chamber 2. By bringing electrodes 17, 18 into contact with the semiconductor layer to apply an electric current, the semiconductor layer is heated and vapor deposition of the magnetic layer is performed at a preferable temp. Thus, the magnetic layer is formed in a good state without damaging the substrate such as PET.
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公开(公告)号：JPH0931657A
公开(公告)日：1997-02-04
申请号：JP18512695
申请日：1995-07-21
Applicant: KAO CORP
Inventor： IMAMURA HIDEKI , SHIGA AKIRA , MIZUNOYA HIROHIDE
IPC: C23C16/50 , C23C16/27 , C23C16/511 , G11B5/84
Abstract: PROBLEM TO BE SOLVED: To securely feed a required amt. of gaseous starting material and to form a good thin film by feeding raw material in a liq. state into plasma reaction tubes arranged oppositely to a supporting body, evaporating the same under heating and plasmatizing it by microwaves. SOLUTION: On a supporting body 1 running along a cooling can roll, a thin film is formed via plasma reaction tubes 5 arranged oppositely thereto. In the above plasma CVD thin film forming method, the plasma reaction tube 5 provided with a coil 8 for ECR is fed with a prescribed amt. of raw material substance in a vessel 9 in a liq. state via a raw material feeding pipe 12 and a valve 13, where this raw material substance is heated by a heater 15 and is evaporated in the reaction tube. This gaseous starting material is irradiated with microwaves from a microwave transmitter 7 and is plasmatized. This plasma is introduced into a vacuum tank 2 to for the thin film on the supporting body 1.
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公开(公告)号：JPH0922662A
公开(公告)日：1997-01-21
申请号：JP17213595
申请日：1995-07-07
Applicant: KAO CORP
Inventor： MIZUNOYA HIROHIDE , KITAORI NORIYUKI , YOSHIDA OSAMU , SASAKI KATSUMI , MATSUO YUZO , SHIGA AKIRA , ISHIKAWA JUNKO
IPC: C23C14/32 , H01J27/20 , H01J37/08 , H01J37/317
Abstract: PROBLEM TO BE SOLVED: To improve the output characteristic of a magnetic recording medium to be obtained, and to improve the film forming speed by arranging an iron nitride body between a cathode and an anode, and forming an accel grid of iron nitride. SOLUTION: An ion gun 30 has a discharge chamber 21 having a gas leading nozzle N, a cathode 22 for discharging the thermion into the chamber 21, an anode 23 for accelerating the thermion, a screen grid 24 for drawing the element ion among the gas generated by the collision with the accelerated thermion, and an accel grid 25. The cathode 22 and the accel grid 25 are made of iron nitride. Metal pollution of stainless steel and tungsten due to the evaporation can be avoided by using this ion gun 30 in the case of impregnating an iron group magnetic film with the nitrogen ion so as to improve the characteristic of the obtained magnetic recording body.
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