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公开(公告)号：JPH07147014A
公开(公告)日：1995-06-06
申请号：JP18372494
申请日：1994-08-04
Applicant: BASF MAGNETICS GMBH
Inventor： HANSU YURUGEN RIHITAA , HARUTOMUUTO HIBUSUTO
Abstract: PURPOSE: To magnetize a thick magnetic layer by a magnetic head by arraying magnetic fine particles so that the magnetic head has a numeric gradient of the magnetic field strength and indicates a specific value. CONSTITUTION: A numeric gradient of a magnetic field strength H of a head is expressed by formula I, and magnetic fine particles are arrayed so that the magnetic field indicates a maximal magnetic field strength or a strength value close to it at least at each write position on a magnetic recording carrier with respect to a stationarily standardized distance z/g between a head mirror face and an upper face of the magnetic recording carrier. The magnetic fine particles in a magnetic layer are arrayed so that an easy axis forms an inclined angle of 6 to the running direction X of the carrier. The carrier runs in the running direction X=A, while in (b) it runs in the inverse direction X=B, and this brings a vertical gap z to the magnetic head with a head air gap length (g). Thus, a thick magnetic layer can be magnetized by the magnetic head.
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公开(公告)号：JPH0944839A
公开(公告)日：1997-02-14
申请号：JP7917396
申请日：1996-04-01
Applicant: BASF MAGNETICS GMBH
Inventor： HANSU YURUGEN RIHITAA , BUERUNAA RENTSU , RONARUDO JIYON BAICHI
Abstract: PROBLEM TO BE SOLVED: To provide a magnetic recording medium having high recording density. SOLUTION: It is found that when a magnetic recording medium for high- density recording has a small nonlinear strain, advantageous recording characteristics can be obtd. A magnetic recording medium having the following property will satisfy the requirement. The property is that, when square wave recording is performed and the recording current is controlled to the max. level of the principal wave of a square wave function at the wavelength corresponding three times as that of the electric head gap width gw , the medium has
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公开(公告)号：JPH0927111A
公开(公告)日：1997-01-28
申请号：JP7917596
申请日：1996-04-01
Applicant: BASF MAGNETICS GMBH
Inventor： HANSU YURUGEN RIHITAA , BUERUNAA RENTSU , RONARUDO JIYON BAICHI
Abstract: PROBLEM TO BE SOLVED: To obtain a recording medium having a high recording density by executing square wave recording in such a manner that the single phase deviating less than 5 deg. from the numerical value at which the phase of Fourier transform at the same wavelength is previously obtd. is measured in the case the square wave recording is executed. SOLUTION: The square wave signals having a frequency of 96kHz are recorded on a tape. These signals are then scanned by a digitizer read by a reading head. The pulses are obtd. by averaging the read pulses at the center. The average values of the 126 pulses in total number is obtd. In such a case, the phase response is (for example, about 5MHz) inclination 0 at the average frequency. The distinct comparison of different curves is thereby made possible.
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Patent Agency Ranking
公开(公告)号：JPH08321031A
公开(公告)日：1996-12-03
申请号：JP7917496
申请日：1996-04-01
Applicant: BASF MAGNETICS GMBH
Inventor： HANSU YURUGEN RIHITAA , BUERUNAA RENTSU , RONARUDO JIYON BAICHI
Abstract: PROBLEM TO BE SOLVED: To obtain a magnetic recording medium having high recording density. SOLUTION: A magnetic recording medium intended for high recording density exhibits advantageous recording characteristics when it has a small nonlinear distortion. At the time of square wave recording, difference between an output level outT calculated after resetting a frequency response from single pulse measurement and an output level outF measured with same wavelength goes plus when a recording current is regulated to the maximum level of basic wave of square wave function having wavelength corresponding to three times of the gap width gW of an electrical head.
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5.发明专利
公开(公告)号：JPH06157786A
公开(公告)日：1994-06-07
申请号：JP18975493
申请日：1993-07-30
Applicant: BASF MAGNETICS GMBH
Inventor： GERUTO FUITSUSHIYAA , ARUFUREETO HAAGEMAIYAA , HARUTOMUUTO HIBUSUTO , HANSU YURUGEN RIHITAA , HANSUUPEETAA SHIRUTOBERUKU , SHIRUBUAN RAZAARU , MATEIASU BORE
IPC: C08J7/00 , B23K26/00 , B29C35/08 , B29C59/16 , C08G63/88 , C08J5/18 , G11B5/73 , G11B5/84 , H05K3/38
Abstract: Sheet-like PET materials having slight surface roughness consisting of fine dot patterns in the submicron range are produced by double successive exposure of the surfaces to polarized UV light produced by a pulsed excimer laser and having planes of polarization arranged at an angle of from 20 DEG to 90 DEG relative to one another, and the PET films treated in this manner are used as a substrate for thin ferromagnetic metal layers.
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公开(公告)号：JPH05101384A
公开(公告)日：1993-04-23
申请号：JP7688892
申请日：1992-03-31
Applicant: BASF MAGNETICS GMBH
Inventor： HANSU YURUGEN RIHITAA , HARUTOMUUTO HIBUSUTO , GERUTO FUITSUSHIYAA
Abstract: PURPOSE: To provide a process for producing a magnetic recording medium of a metallic thin layer type of which the projection of the desirable magnetic direction with respect to a tape surface is aligned to an average recording direction. CONSTITUTION: The magnetic recording medium is produced by forming a vapor jet 7 of a ferromagnetic material from an evaporating device 6 to which this material is supplied in a reduced pressure chamber 1 and depositing the vapor jet by evaporation on polymer band-like substrates guided on a cylindrical drum. At this time, the vapor jet 7 is brought into collision against the substrates 2, 2' at the angle different from 90 deg.. The vapor jet 7 of the ferromagnetic material injected form the evaporating device 6 toward the cylindrical drums 4, 4' in the reduced pressure chamber 1 is brought into contact with the surfaces of two sheets of the band-lie substrates 2, 2' guided in the direction facing each other on two pieces of the separate cylindrical drums 4, 4' at the angle not below 30 deg. and not over 90 deg.. The evaporating device 6 is shifted in the axial line direction of the drums so as to be arranged between two pieces of the cylindrical drums 4, 4'.
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公开(公告)号：JPH0927112A
公开(公告)日：1997-01-28
申请号：JP7917696
申请日：1996-04-01
Applicant: BASF MAGNETICS GMBH
Inventor： HANSU YURUGEN RIHITAA , BUERUNAA RENTSU , RONARUDO JIYON BAICHI
Abstract: PROBLEM TO BE SOLVED: To obtain a high recording density by setting the quotient of the residual deviation having Ir/(d.L)
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公开(公告)号：JPH05101383A
公开(公告)日：1993-04-23
申请号：JP7688692
申请日：1992-03-31
Applicant: BASF MAGNETICS GMBH
Inventor： HANSU YURUGEN RIHITAA , HARUTOMUUTO HIBUSUTO , GERUTO FUITSUSHIYAA
Abstract: PURPOSE: To provide a process for producing a magnetic recording medium of a metallic thin layer type which does not exhibit the defect of the loss of the residual induction to be induced at the time of reproduction while the deviation from the desirable magnetic direction of the magnetic recording medium produced by the conventional method brings about such loss and more particularly the magnetic recording medium of the metallic thin film type of which the projection of the desirable magnetic direction with respect to a tape surface is aligned to an average recording direction. CONSTITUTION: The magnetic recording medium substantially consisting of a polymer band-like substrate guided on a cylindrical drum and more particularly a roller-shaped cooling drum and the tightly adhesive thin layer of a ferromagnetic material is produced by forming the vapor jet of this ferromagnetic material from an evaporating device 6 to which this material is supplied in a reduced pressure chamber 1 and depositing the vapor jet by evaporation on this substrate. At this time, the vapor jet 7 is brought into collision against the substrate 2 at the angle different from 90 deg.. The revolving shaft of the cylindrical drum 4 for guiding the substrate is inclined with respect to the plane of the evaporating device 6.
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