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31. 发明专利

JPH03130901A METHOD AND DEVICE FOR TESTING FRICTION AND WEAR OF TAPE 失效
公开(公告)号：JPH03130901A
公开(公告)日：1991-06-04
申请号：JP27313089
申请日：1989-10-19
申请人： HITACHI MAXELL
发明人： AKAHA NAOTO
IPC分类号： G11B5/00 , G01N3/56
摘要： PURPOSE:To exactly test the friction of a tape by catching a change in the sliding state of the tape by the change of a friction coefficient obtained by using a friction and wear testing machine. CONSTITUTION:A loop-shaped video tape 1 is loaded to the friction and wear testing machine and set so that the read value of an incoming side tape tension sensor 5 can be 150g. Then, the loop-shaped video tape is driven and traveled at the speed of 1m/sec by the two pairs of capstans 2 and 11 and pinch rollers 3 and 12. The tape tension on incoming and outgoing sides is measured by the incoming side tape tension sensor 5 and an outgoing side tape tension sensor 9 and the friction and wear test of the loop-shaped video tape 1 is executed. Since the change of the friction coefficient due to this test is satisfactorily corresponding to the still property of a VTR, the change in the sliding state of the tape can be exactly caught by the change of the friction coefficient and the friction and wear of the tape 1 can be exactly tested without fail.

32. 发明专利

JPS6478426A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS6478426A
公开(公告)日：1989-03-23
申请号：JP23568687
申请日：1987-09-19
申请人： HITACHI MAXELL
发明人： AKAHA NAOTO
IPC分类号： G11B5/70 , G11B5/78 , G11B5/842
摘要： PURPOSE:To prevent the rupture, exfoliation and damage of the cut end face of a magnetic layer or back coating layer by providing the cut end face of the magnetic layer or the back coating layer which is retreated inward from the cut end face of a substrate cut to a prescribed shape. CONSTITUTION:The magnetic layer 12 or the back coating layer is so provided that the cut end face thereof is retreated from the cut end face of the substrate 11. Namely, the cut end face of the magnetic layer 12 is required to be retreated at least by the distance (t) corresponding to the thickness of the magnetic layer 12. While residual cracks are more surely removed as the retreat distance (t) is larger, the retreating of said end face by as much as the distance corresponding to the total thickness T of a magnetic tape 13 suffices. The cutting of the raw film of the magnetic recording medium is thereby satisfactorily executed and the exfoliation and damage of the magnetic layer 12, etc., are obviated. The magnetic recording medium having a high grade and high reliability is thus obtd.

33. 发明专利

JPS6426116A METHOD AND DEVICE FOR TORQUE MEASUREMENT 失效
公开(公告)号：JPS6426116A
公开(公告)日：1989-01-27
申请号：JP8914587
申请日：1987-04-10
申请人： HITACHI MAXELL
发明人： AKAHA NAOTO , KAWAKAMI SHINJI
IPC分类号： G01L3/00
摘要： PURPOSE:To measure actuation torque based on static maximum frictional drag with high accuracy by setting the total torsional rigidity of a movable part below a specific value for a torque measuring method. CONSTITUTION:The torsional rigidity of a torsion spring 5 needs to be adjusted properly so as to accurately measure the actuation torque. It is preferable to set the inclination of the curve of an increase in driving force properly as shown by a straight line C. For the purpose, the total torsional rigidity of the movable part consisting of a rotary coupling part 2, a torque detector 3, a rotary coupling part 4, the torsional spring 5, a rotary coupling part 6, a rotary driving force transmission part 7, and a rotary shaft 8 is set to

34. 发明专利

JPS63256394A METHOD AND DEVICE FOR CUTTING FILM RAW FABRIC USING POLYETHYLENE TEREPHTHALATE FILM AS BASE MATERIAL 失效
公开(公告)号：JPS63256394A
公开(公告)日：1988-10-24
申请号：JP8912787
申请日：1987-04-11
申请人： HITACHI MAXELL
发明人： AKAHA NAOTO
IPC分类号： B26D1/00 , B26D3/00

35. 发明专利

JPS63255634A APPARATUS FOR MEASURING FRICTION TORQUE OF MAGNETIC DISK 失效
公开(公告)号：JPS63255634A
公开(公告)日：1988-10-21
申请号：JP8912487
申请日：1987-04-11
申请人： HITACHI MAXELL
发明人： AKAHA NAOTO , KAWAKAMI SHINJI
IPC分类号： G01L5/00 , G11B23/00
摘要： PURPOSE:To enhance the measuring accuracy of the max. friction torque, by setting the synthetic torsional stiffness of a rotary shaft driving power source, a disk clamping mechanism, a torque detection means and a rotary power transmitting means to 1,500g.cm/rad or less. CONSTITUTION:This apparatus is constituted by connecting a rotatory power transmitting power source 1, a torque detector 3, a torsion spring 5, a rotary shaft 7 and a disk clamp mechanism 8 and the friction torque due to the sliding contact of a magnetic disk 9 is measured by the friction torque detector 3. The torsional stiffness of the spring 5 is properly adjusted to set the synthetic torsional stiffness of the power transmitting system consisting of the power source 1, the detector 3, the spring 5 and the mechanism 8 to 1,500g.cm/rad or less and the error due to the bending of the disk 9 or the inertial resistance of the mechanism 8 and the disk 9 is reduced. By this method, the max. friction torque at the start time of rotation can be accurately measured with high accuracy.

36. 发明专利

JPS57123537A Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：JPS57123537A
公开(公告)日：1982-08-02
申请号：JP981781
申请日：1981-01-26
申请人： Hitachi Maxell Ltd
发明人： YAMAGUCHI ATSUTAKA , AKAHA NAOTO
IPC分类号： G11B5/72 , C09D5/23 , C10M103/00 , C10M107/02 , C10N40/18 , G11B5/725
CPC分类号： G11B5/725
摘要： PURPOSE:To improve durability by improving wear resistance by providing a lubricant layer, obtained by dispersing a solid lubricant in polyethylene wax, on a magnetic layer. CONSTITUTION:On a magnetic layer surface obtained by dispersing ferromagnetic material magnetic powder in binder resin, a lubricant layer which contains polyethylene wax and a 10-50wt% solid lubricant to total weight and has 1-100mg/m adhesion amount range is provided by applying and drying a solution obtained by dispersion the solid lubricant of fine powder of fluororesin, such as polytetrafluoroethylene or MoS2 in a mixed solution in n-heptane and freon of polyethylene wax with a 4-100 degree of polymerization. Thus, the magnetic tape has improved wear resistance, the hard-to-peel solid lubricant and improve durability.
摘要翻译：目的：通过提供通过将固体润滑剂分散在聚乙烯蜡中而获得的润滑剂层在磁性层上提高耐磨性来提高耐久性。构成：在将铁磁材料磁粉分散在粘合剂树脂中的磁性层表面上，含有聚乙烯蜡和总重量为10〜50重量％的固体润滑剂的润滑剂层具有1-100mg / m 2附着量范围，通过将聚四氟乙烯或MoS 2等氟树脂细粉末的固体润滑剂分散在聚乙烯蜡的正庚烷和氟利昂混合溶液中而得到的溶液进行干燥，得到4-100聚合度。因此，磁带具有改进的耐磨性，难以剥离的固体润滑剂和提高耐久性。

37. 发明专利

JPS57123527A Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：JPS57123527A
公开(公告)日：1982-08-02
申请号：JP981281
申请日：1981-01-26
申请人： Hitachi Maxell Ltd
发明人： YAMAGUCHI ATSUTAKA , AKAHA NAOTO
IPC分类号： G11B5/708 , C09D5/23 , C09D7/12 , C10M107/20 , C10N40/18 , G11B5/71
CPC分类号： G11B5/71
摘要： PURPOSE:To obtain a durable magnetic recording medium free of interlayer adhesion and bleeding of a lubricant, by containing straight-chain polyethylene wax in a magnetic layer. CONSTITUTION:Polyethylene wax, which has =0.1wt% and
摘要翻译：目的：通过在磁性层中含有直链聚乙烯蜡，获得不含层间粘合和润滑剂渗色的耐用磁记录介质。构成：即使含有（-C 2 H 4）m（m）为4〜100并且分子量分布窄的（-C 2 H 4）m表示的含有O 2的聚乙烯蜡与磁性粉末一起混合分散在溶剂中，粘合剂树脂（聚氨酯树脂，氯乙烯醋酸乙烯酯-PEPE共聚物等）等，得到磁性涂料，将其涂于基材上干燥。然后，进行表面处理并切割基底以制造磁带。聚乙烯蜡的含量优选> = 0.1重量％，并且<= 20重量％的磁粉。因此，磁带具有耐磨性并且没有层间粘附。

38. 发明专利

JPS5792431A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS5792431A
公开(公告)日：1982-06-09
申请号：JP16699780
申请日：1980-11-26
申请人： HITACHI LTD , HITACHI MAXELL
发明人： YAMAGUCHI ATSUTAKA , AKAHA NAOTO , OOBA YOUICHI , ISHIHARA HEIGO
IPC分类号： G11B5/72 , C09D5/23 , C10M105/76 , C10M139/00 , C10N40/18 , G11B5/725
摘要： PURPOSE:To improve durability by increasing wear resistance by decreasing a coefficient of friction, by providing a silicon compound, containing specific F, on a magnetic-layer side surface. CONSTITUTION:A 0.1-10wt% compound shown by the formula is contained in magnetic powder to form a magnetic layer. The said compound bleeds the magnetic layer to the surface to decrease a coefficient of friction extremely. Thus, a magnetic tape, etc., which has wear resistance and superior durability is obtained.

39. 发明专利

JPS5680827A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS5680827A
公开(公告)日：1981-07-02
申请号：JP15723879
申请日：1979-12-04
申请人： HITACHI MAXELL
发明人： YAMAGUCHI ATSUTAKA , OOIWA TSUNEMI , AKAHA NAOTO
IPC分类号： G11B5/708 , C09D5/23 , G11B5/70
摘要： PURPOSE:To increase both the durability and the oxidation resistance of a magnetic recording medium, by forming a film of the specific high molecular material containing the specific modified silicone oil onto the surface of the Co-contg. magnetic thin film. CONSTITUTION:The high molecular material containing about 1-20wt% modified silicon oil composed essencailly of the compound shown in the formulas (one of R1 and R2 is the group of formula II or III and the other is the methyl group; R3 and R5 are alkyl groups of C1-20; R4 is the alkylene group of C1-20) is dissolved into a proper solvent and then coated on the surface of a metallic magnetic thin film containing Co formed on a substrate in about 0.1-1.0mu thickness. As the high molecular material one or more kinds among a vinyl chloride-vinyl acetate copolymer, a polyvinyl butyral copolymer and a methacrylate are used. With formation of such film, a magnetic recording medium such as the magnetic tape or the like can be obtained with no reduction of the output caused by a bleed-out phenomenon even at a high temperature and high humidity.

40. 发明专利

JPS5668931A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS5668931A
公开(公告)日：1981-06-09
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
摘要： PURPOSE:To improve durability by providing a coating of specific aliphatic ester on a magnetic metal thin film for a magnetic recording medium containing Co. CONSTITUTION:To a magnetic metal thin film containing Co, ester of dihydric alcohol, such as ethylene glycol, propylene glycol, trimethylene glycol, alpha-butylene glycol, and hexamethylene glycol, trivalent alcohol such as glycerol and pentaglycerol, and a fatty acid of C12-C13 such as a lauric acid, tridecyl acid, myristic acid, pentadecyl acid, palmitic acid, heptadecyl acid, and stearic acid is bonded in 50-500mg/m proportion. Cosequently, the coefficient of the friction to a magnetic head is decreased to improve the lubricity, the wear resistance is improved and even after long-period storage at a high temperature, the durability will not lower much.

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