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81. 发明专利

JPH07153053A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH07153053A
公开(公告)日：1995-06-16
申请号：JP32113293
申请日：1993-11-25
申请人： HITACHI MAXELL
发明人： AKAHA NAOTO , KITAHATA SHINICHI
IPC分类号： C01G49/00 , C09D5/23 , C09D7/12 , G11B5/70 , G11B5/706 , G11B5/716 , H01F1/11
摘要： PURPOSE:To obtain a high output over a range from a short wavelength region to a long wavelength region by a method wherein a magnetic layer made of plate-shaped magnetic powder whose easy-to-magnetize axis is inclined by a specific angle is formed on a substrate so as to have the plate planes of the magnetic powder approximately parallel to the magnetic layer surface. CONSTITUTION:A magnetic layer made of plate-shaped magnetic powder whose easy-to-magnetize axis is inclined from a direction perpendicular to its plate plane by 5-50 degrees is formed on the substrate of a magnetic recording medium so as to have the plate planes of the magnetic powder approximately parallel to the magnetic layer surface. The surface roughness of the magnetic layer is, preferably, not larger than 5nm in Ra and both the vertical component and the horizontal component of a magnetic field generated by a narrow gap ring head are efficiently utilized. Further, the excellent surface smoothness of the magnetic layer is provided to obtain a high output over a range from a short wavelength region to a long wavelength region.

82. 发明专利

JPH0628653A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH0628653A
公开(公告)日：1994-02-04
申请号：JP20299492
申请日：1992-07-06
申请人： HITACHI MAXELL
发明人： AKAHA NAOTO
IPC分类号： G11B5/66 , G11B5/64 , G11B5/73 , G11B5/738
摘要： PURPOSE:To provide a magnetic recording medium excellent in durability by forming a lubricant replenishing layer contg. a lubricant on a substrate film and a thin ferromagnetic metal film on the replenishing layer. CONSTITUTION:A lubricant replenishing layer 2 is formed on a substrate film 1 and a thin metal film 3 is formed on the layer 2 by diagonal vacuum deposition of a ferromagnetic material made of a ferromagnetic metal or alloy. Particles 31 of the ferromagnetic material are first deposited at an incident angle alpha and then grown at a smaller angle beta than the angle alpha to form the film 3 taking in nitrogen and oxygen existing in the vacuum system and contg. gaps 4 of 20-30Angstrom width formed in accordance with the rate of deposition between the particles 31. Since a lubricant is replenished from the replenishing layer 2 by exudation on the film 3 through the gaps 4 between the particles 31 in the film 3 when the film 3 is repeatedly slid on a magnetic head, a guide pole, etc., the lubricating effect is sustained, the coefft. of friction of the film 3 is sufficiently reduced and durability is enhanced.

83. 发明专利

JPH05149732A METHOD AND DEVICE FOR MEASURING SURFACE SHAPE 失效
公开(公告)号：JPH05149732A
公开(公告)日：1993-06-15
申请号：JP34187691
申请日：1991-11-29
申请人： HITACHI MAXELL
发明人： AKAHA NAOTO
IPC分类号： G01B11/30
摘要： PURPOSE:To measure the surface shape of an object to be measured under a contact condition which is resembled to a practical condition by bringing a light-transmissive body into contact with the surface of the object and filling the space between the body and object with a liquid filler. CONSTITUTION:After a light-transmissive body 4 is brought into contact with the surface of an object 1 to be measured supported by a backing 2, the space between the body 4 and uneven surface of the object 1 is filled with a liquid filler 5 having refractive index close to that of the body 4. The light from a light source 13 is reflected by a beam splitter 15 and part of the reflected light is focused on the surface of the object 1 by means of a sample-side objective 18 through the body 4 and filler 5 after passing through an interferometer and beam splitter 17. Its reflected light returns to the objective 18 and passes through the splitter 17. On the other hand, part of the reflected 15 light is focused on a reference surface 21 through a reference surface-side objective 19 after it is reflected by the splitter 17. Its reflected light returns to the objective 19 and is reflected 17. As a result, each reflected 17 and transmitted 17 reflected light interferes with another and generates interference fringes in corresponding to the uneven surface of the object 1. The fringes are converted into electrical video signals by means of a camera 23 and the surface shape of the object 1 is found from the fringes.

84. 发明专利

JPH04205715A TAPE RUNS TEST METHOD AND ITS TESTING DEVICE 失效
公开(公告)号：JPH04205715A
公开(公告)日：1992-07-27
申请号：JP33376890
申请日：1990-11-29
申请人： HITACHI MAXELL
发明人： AKAHA NAOTO
IPC分类号： G11B5/84
摘要： PURPOSE:To consecutively measure a friction coefficient between a tape and a sliding member with high accuracy by disposing a sliding member in a tape path, detecting the tension of the tape before and after the tape slides and contacts with the sliding member, and performing the division operation in real time. CONSTITUTION:The tension of the tape 4 which runs sliding on a slider 12 is detected by tension detectors 11 and 16 on tape incoming and outgoing sides. A measured value is inputted in a real-time division computing element 22, and the tension on the incoming side and the tension on the outgoing side are arithmetically processed in real time, then an output signal which is not influenced by fluctuation component is obtained. The signal is inputted in a logarithm computing element 23, and voltage in proportion to the friction coefficient based on the output of the signal of the tension is outputted, A/D converted by a converter 24, and computed by a computer 25 to be stored. Thus, the friction coefficient between the tape and the slider is consecutively measured with high accuracy.

85. 发明专利

JPH036437A METHOD AND APPARATUS FOR TESTING STRENGTH OF FILM STRUCTURE 失效
公开(公告)号：JPH036437A
公开(公告)日：1991-01-11
申请号：JP14197489
申请日：1989-06-02
申请人： HITACHI MAXELL
发明人： AKAHA NAOTO
IPC分类号： G01N3/34
摘要： PURPOSE:To test accurately a fatigue strength in relation to a bending stress by making a tape-shaped film structure run while winding it on an appropriate number of guide members at a specified angle so that the total sum of winding angles be a specified number of degrees. CONSTITUTION:A film structure 1 is held by a capstan 2 and a pinch roller 3 between and driven to run and is led into a strength testing element 6. In the testing element 6, guide rollers 7 for a fatigue test numbering 100 or more, for instance, are juxtaposed so that they are positioned in two rows, in the front and the rear, alternately. The surface and rear of the structure 1 led in are wound on the rollers 7 alternately at an angle of 90 or more degrees so that the total sum of winding angles is 1,800 degrees or above, together with the ones of other guide rollers, and the structure is made to run continuously in this state. A bending fatigue strength is tested in the course of this running. On the occasion, the tensions of the structure 1 on the entrance and exit sides are detected by entrance-side and exit-side tape tension sensors 5 and 8 respectively, the tension in the course of running is adjusted, and the strength of a repeated bending stress applied in the course of running of the structure on the rollers 7 is adjusted.

86. 发明专利

JPH03699B2 失效
公开(公告)号：JPH03699B2
公开(公告)日：1991-01-08
申请号：JP18871381
申请日：1981-11-24
申请人： HITACHI MAXELL
发明人： AKAHA NAOTO , YAMAGUCHI ATSUTAKA , MATSURA TAKESHI , WATAYA SEIJI
IPC分类号： C09D5/23 , C09D7/12 , G11B5/70 , G11B5/73 , G11B5/735
摘要： A magnetic recording medium such as a magnetic tape, which comprises a base film, a magnetic layer having an elastic modulus at 1% elongation of not less than 1,200 kg/mm 2 totally In both longitudinal and width direction which is higher than that of the base film, said magnetic layer being formed on one surface of the base film, and a backcoat layer having an elastic modulus at 1% elongation of not less than 1,200 kg/mm 2 totally In both longitudinal and width directions which is higher than that of the base film, said backcoat layer being formed on another surface of the base film, said magnetic recording medium having a total thickness of not more than 17 µ, said magnetic recording medium having excellent mechanical strength and being used without buckle and injury during usage even in a thin thickness.

87. 发明专利

JPH0245244B2 失效
公开(公告)号：JPH0245244B2
公开(公告)日：1990-10-08
申请号：JP6380180
申请日：1980-05-14
申请人： HITACHI MAXELL
发明人： OGOSHI NOBUAKI , KARASHIMA KAZUTO , YAMAGUCHI ATSUTAKA , WATAYA SEIJI , AKAHA NAOTO
IPC分类号： C09D5/23 , G11B5/72

88. 发明专利

JPH02186259A METHOD AND APPARATUS FOR MEASURING KINETIC PROPERTY OF MAGNETIC POWDER IN MAGNETIC PAINT 失效
公开(公告)号：JPH02186259A
公开(公告)日：1990-07-20
申请号：JP742389
申请日：1989-01-12
申请人： HITACHI MAXELL
发明人： AKAHA NAOTO , SUMIYA KENJI
IPC分类号： G01R33/12 , G01N27/72
摘要： PURPOSE:To enable accurate evaluation of kinetic property of magnetic powder by a method wherein a magnetization level of a magnetic paint is detected applying a fine sinusoidal alternating magnetic field thereto and a phase difference is determined between a sine wave signal corresponding to the magnetic field applied and a sine wave signal corresponding to a change in the magnetization level to measure a kinetic property of the magnetic powder. CONSTITUTION:A fine alternating magnetic field varying in intensity sinusoidally to such an extent that a magnetic moment of magnetic powder is not inverted is applied to a magnetic paint 3 and with the application of the magnetic field, a magnetization level of the magnetic paint 3 containing the magnetic powder turning is detected with a magnetization detection coil 7. Then, a phase detection is performed with a phase detector 12 between a sine wave signal corresponding to the magnetic field applied and a sine wave signal corresponding to a change in the magnetization level. Thus, a phase difference between both the signals is determined to measure a kinetic property of the magnetic powder in the magnetic paint 3.

89. 发明专利

JPH0223925B2 失效
公开(公告)号：JPH0223925B2
公开(公告)日：1990-05-25
申请号：JP14407879
申请日：1979-11-06
申请人： HITACHI MAXELL
发明人： YAMAGUCHI ATSUTAKA , OOIWA TSUNEMI , AKAHA NAOTO
IPC分类号： G11B5/72 , G11B5/64 , G11B5/66 , G11B5/725

90. 发明专利

JPS6478427A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS6478427A
公开(公告)日：1989-03-23
申请号：JP23568887
申请日：1987-09-19
申请人： HITACHI MAXELL
发明人： AKAHA NAOTO
IPC分类号： G11B5/70 , G11B5/78
摘要： PURPOSE:To prevent the mechanical damage in the edge parts of a magnetic recording medium by forming the section in the thickness direction in the edge parts of the magnetic recording medium to the gently crowned face enclosed by the concentrical circles respectively having the specific diameters with respect to the thickness thereof. CONSTITUTION:The section 21 in the thickness direction in the edge parts 2 of the magnetic recording medium 1 is formed to the gently crowned face defined within the range enclosed by the two concentrical circles; the circle A having the diameter of 1.2 times the thickness (t) of the magnetic recording medium 1 and the circle B having the diameter of 0.8 times said thickness, respectively. The contact force with a control member is thus relieved by the gently crowned face of the section 21 in the edge parts and the tracing accuracy of tracks is maintained high. The durability of the edge parts against the mechanical damage thereof is thus improved.

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