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111. 发明专利

JPH087249A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH087249A
公开(公告)日：1996-01-12
申请号：JP16599794
申请日：1994-06-24
申请人： HITACHI MAXELL
发明人： AKAHA NAOTO
IPC分类号： G11B5/66 , G11B5/64 , G11B5/65 , G11B5/73
摘要： PURPOSE:To inhibit the occurrence of jitter by forming a ferromagnetic metallic thin film layer on a substrate film, forming many recesses in the surface of the layer and allowing a lubricant to exist on the layer with the formed recesses. CONSTITUTION:At least one ferromagnetic metallic thin film layer is formed on a substrate film and recesses each having a depth >=5.5 times the three- dimensional surface roughness Ra of the layer and >=0.8mum cross-sectional area of the central part of the depth are formed in the surface of the layer by a number of >=2,000 per 1mm of the surface. A lubricant is then allowed to exist on the layer with the formed recesses 3 to obtain the objective magnetic recording medium. When a magnetic head comes in sliding contact with a guide member, smooth running is ensured and the occurrence of jitter is effectively inhibited.

112. 发明专利

JPH0626832A METHOD AND APPARATUS FOR MEASURING SURFACE SHAPE 失效
公开(公告)号：JPH0626832A
公开(公告)日：1994-02-04
申请号：JP20443692
申请日：1992-07-07
申请人： HITACHI MAXELL
发明人： AKAHA NAOTO
IPC分类号： G01B9/02 , G01B11/24 , G01B11/30 , G11B5/84
摘要： PURPOSE:To make it possible to measure the shape of a surface under the contact condition close to the actual using state by correcting the length of a light path so that optical interference is generated with the reflected light from the surface of a material to be measured and the reflected light from a reference surface, and masuring the surface shape. CONSTITUTION:A material to be measured 1 is supported on a reare contact 2. A light transmitting contact body 4 is brought into contact with the front surface of the material. Liquid-state filler 5 is filled between the contact body 4 and the surface of irregularities. A reference surface and a lens 19 are moved in the direction of an optical axis with a light-path-length correcting mechanism 24. Adjustment is performed so that the light-path length from a lens 18 to the surface of the material to be measured 1 becomes equal to the light-path length from an objective lens 19 on the reference surface side to a reference surface 20. The reflected light, which is reflected from a beam splitter 17 of an interferometer and advances upward, is overlapped and made to interfere with the reflected light, which is reflected from the surface of the material to be measured 1, transmitted through the splitter 17 and advances upward. The interference fringes corresponding to the irregularities of the surface of the material to be measured are generated. The result of the analysis of the interference fringes with an interference-fringe analyzer 32 is transmitted to a measurement controller 33. A piezoelectric element 22 is driven so as to generate the interference fringes accurately, and the light-path-correting mechanism 24 is operated. Therefore, the surface shape of the material to be measured 1 can be measured under the contact condition.

113. 发明专利

JPH0626831A METHOD AND APPARATUS FOR MEASURING SURFACE SHAPE 失效
公开(公告)号：JPH0626831A
公开(公告)日：1994-02-04
申请号：JP20443592
申请日：1992-07-07
申请人： HITACHI MAXELL
发明人： AKAHA NAOTO
IPC分类号： G01B9/02 , G01B11/24 , G01B11/30 , G11B5/84
摘要： PURPOSE:To make it possible to measure the shape of a surface under the state close to the actual using state by pushing the surface of a material to be measured on a light transmitting contact body, casting a light ray on the surface of the material to be measured, and measuring the surface shape of the material to be measured by an optical method. CONSTITUTION:A material to be measured 1 is supported on a pushing container 2 thorugh a packing ring 2 in the tightly sealed state. The material 1 is brought into contact with the surface of a light transmitting contact body 5 with a sample pushing part 4 or held through a spacer ring 6 so that the material 1 approaches a part at the distance of 0.1mm from the surface. Pushing fluid 9, which is compressed by a pressure with a regualtor 8, is supplied into the container 3. The rear surface of the material to be measured 1 is pushed, and the front surface of the material to be measured 1 is pushed to the contact body 5. The light from a light source 11 is reflected with a splitter 13 and focused on the surface of the material to be measured 1 with a lens 16. The reflected light passes splitters 15 and 13 and advances upward. Meanwhile, part of the incident light into an interferometer 14 is reflected with the splitter 15 and focused on a reference surface 19 with a lens 17. The reflected light is reflected with the splitter 15 and advances upward. Two reflected light interfere, and the interference fringes corresponding to the irregularities of the surface of the material to be measured 1 are generated. The fringes are converted into the electric image signal, and the surface shape can be measured.

114. 发明专利

JPH0444690A TAPE TRAVELING DEVICE 失效
公开(公告)号：JPH0444690A
公开(公告)日：1992-02-14
申请号：JP15090890
申请日：1990-06-09
申请人： HITACHI MAXELL
发明人： AKAHA NAOTO
IPC分类号： G11B33/14
摘要： PURPOSE:To remove head generated in the device without applying any adverse influence onto various high-sensitivity sensors, precise mechanism and electronic circuit or the like by communicating and linking an air blowing means through a flexible pipe to the main body of the tape traveling device. CONSTITUTION:Power caused by a motor or the motive power of an electromagnet, etc., is discharged as heat. A flexible pipe 26 communicated and linked to a main body 1 of a tape travel testing device A is communicated and linked to an air blowing means 27 and the other end so as to blow air into the main body from a position separated from the main body 1. On the other hand, a flexible pipe communicating and linking one end to the air blowing means 27 communicates and links the other end to an electronic equipment 29 connected to the main body 1 so as to blow the air from the position separated from the electronic equipment, which is integrated with a unit for controlling the operation of tape travel, power supply circuit and electronic circuit such as the electronic amplifier, etc., of a detector such as a tape tension sensor or the like, into the electronic device 29.

115. 发明专利

JPH02177113A METHOD AND DEVICE FOR TESTING ABRASION PROPERTY OF TAPE AND SLIDER 失效
公开(公告)号：JPH02177113A
公开(公告)日：1990-07-10
申请号：JP33432788
申请日：1988-12-28
申请人： HITACHI MAXELL
发明人： AKAHA NAOTO
IPC分类号： G01L5/00 , G11B5/455
摘要： PURPOSE:To exactly and surely test the abrasion property of a tape and a slider by bringing a tape to slide-contact, while running it, with an edge of the slider having an edge of a specific angle, and measuring continuously frictional force of both of them. CONSTITUTION:A tape 4 is brought to a slide-contact, while running it, with an edge 14 of a slider 13 having an edge constituted of adjacent surfaces which come into contact within a range in which an angle is 0 to 180 deg., and frictional force of both of them in the course of running of the tape is measured continuously. Also, by measuring, etc., abrasion width W of the edge 14 of the slider 13 after running of the tape, an abrasion property of the tape and the slider is tested. In such a way, while detecting a slide-contact state of the tape and the slider, the abrasion property of the tape and the slider can be tested exactly and surely.

116. 发明专利

JPH01159178A POLISHING FILM 失效
公开(公告)号：JPH01159178A
公开(公告)日：1989-06-22
申请号：JP31987687
申请日：1987-12-16
申请人： HITACHI MAXELL
发明人： AKAHA NAOTO
IPC分类号： G11B5/41 , B24D11/00
摘要： PURPOSE:To attain fine polishing finishing by forming the sectional surface in the thickness direction of the edge part of a polishing film into a smooth projecting curved surface. CONSTITUTION:A desired polishing film 1 is obtained by forming a polishing coated film containing polishing agents having a Moh's hardness of 5.5 or more onto a basic body. The sectional surface 21 in the thickness direction of the edge part 2 of the polishing film 1 is formed to a smooth projecting curved surface accommodated within a range surrounded by two concentric circles (A, B) of the circle A having the diameter 1.25 times for the thickness (t) of the polishing film 1 and the circle B having the diameter 0.85 times. By forming the edge part 2 into the projecting curved surface 21, the concentration of the contact pressure between the worked surface and the edge part 2 is lightened, and the generation of flaw on the worked surface by a strong collision onto the acute angle part of the polishing coated film and the breakage and exfoliation of the polished coated film can be suppressed.

117. 发明专利

JPS6478433A MANUFACTURE OF MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS6478433A
公开(公告)日：1989-03-23
申请号：JP23568787
申请日：1987-09-19
申请人： HITACHI MAXELL
发明人： AKAHA NAOTO
IPC分类号： G11B5/84
摘要： PURPOSE:To remove and shape residual crack and to prevent drop out and the deterioration of an output by irradiating the obtained edge part of a magnetic recording medium, which has been cut in a prescribed shape by means of a cutting device such as a cutter, with a laser beam and shaping the edge part. CONSTITUTION:The laser beam 10 radiated from a laser oscillator 9 irradiates the edge part 16 of the magnetic recording medium (magnetic tape) 1 which travels in the direction of an arrow A at a considerable speed and which has been cut in a prescribed width by the cutter. When the convergent light 14 of the laser beam in an appropriate strength is radiated, only a magnetic layer having an absorption coefficient compared to a base body is heated and a temperature increases to several hundreds several thousand degrees, whereby the edge part of the magnetic layer is instantaneously liquefied, vaporized or is made into plasma and removed in the laser beam irradiation spot 17 of the edge part 16 in the magnetic tape 1 traveling the lower part of a working head 15. Thus, the residual crack of the magnetic layer and the like in the tape edge part 16 is removed and the break and peel damage of the magnetic layer 3 and the like due to a slidable travel with an adjusting member can be prevented.

118. 发明专利

JPS6478429A MAGNETIC DISK 失效
公开(公告)号：JPS6478429A
公开(公告)日：1989-03-23
申请号：JP23569087
申请日：1987-09-19
申请人： HITACHI MAXELL
发明人： AKAHA NAOTO
IPC分类号： G11B5/82 , G11B5/62 , G11B5/73
摘要： PURPOSE:To improve the rigidity of an edge part and to reinforce the mechanical strength of especially the edge part of a magnetic disk by providing the ribs of a specified thickness in the whole periphery or a part of the edge part of the magnetic disk. CONSTITUTION:The higher the maximum heights h1 and h2 of the ribs 3 and 4 provided on both sides of the edge parts of the magnetic disk 1, the better reinforcement effect can be obtained. When they are too high, a stress is apt to be concentrated on the base of the magnetic disk 1 and on the contrary, a structural defect occurs, whereby they are made 120% or below the thickness (t) of the magnetic disk 1. It is preferable to set the widths of the ribs 3 and 4 to be as large as possible, and when they are too wide, a clearance occurs in a chucking part with a disk clamp and there is the possibility of an installa tion defect, whereby they are kept to 500% or below the thickness (t) of the magnetic disk. Thus, the mechanical strength of the edge part 2 can be rein forced and durability and reliability considerably improved.

119. 发明专利

JPS63255823A PRODUCTION OF MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS63255823A
公开(公告)日：1988-10-24
申请号：JP8912587
申请日：1987-04-11
申请人： HITACHI MAXELL
发明人： AKAHA NAOTO
IPC分类号： G11B5/708 , G11B5/64 , G11B5/65 , G11B5/84
摘要： PURPOSE:To eliminate thermal damages of a cut face and to permit cutting with high accuracy by providing a light absorbing part having the light reflectivity lower than the light reflectivity of a thin ferromagnetic metallic film layer on a substrate so as to co-exist with the thin ferromagnetic metallic film layer and projecting a laser beam to the light absorbing part, thereby cutting the substrate to a prescribed shape. CONSTITUTION:A raw sheet 16 of a magnetic recording medium formed with the thin ferromagnetic metallic film layer 14 and the band-shaped light absorbing part 15 not formed with the thin ferromagnetic metallic film layer on the substrate 4 in such a manner that said layer and part co-exist is formed. Cutting of such sheet is execute by converging the laser beam from a laser oscillation tube by a condenser lens mounted in a gas nozzle-shaped processing head 18, projecting converged light 20 to the raw sheet 16 of the magnetic recording medium made to travel below the processing head 18 and locally heating the light absorbing part 15 which is the surface to be irradiated with the laser beam to a high temp., thereby liquefying or gassifying said part or converting said part to plasma to execute separation and removal. The cutting is thereby executed at the suppressed thermal damages with the high accuracy.

120. 发明专利

JPS59168305A Surface-shape measuring device 失效
标题翻译：表面形状测量装置
公开(公告)号：JPS59168305A
公开(公告)日：1984-09-22
申请号：JP4151383
申请日：1983-03-15
申请人： Hitachi Maxell Ltd
发明人： AKAHA NAOTO , OCHI MUNEYOSHI , MATSUMOTO TAIJI
IPC分类号： G01B7/34 , G01B7/28 , G01B21/20
摘要： PURPOSE: To measure the shape of a surface highly accurately without effects of disturbance such as vibration and noisees, by detecting frequency components of background noises, and performing a subtracting process from the frequency component of the detected output when a sample is scanned.
CONSTITUTION: The probe of a sensor 2 is contacted and fixed to the surface of a sample 1. Under this state, the background noises of the sample 1 is detected. Each frequency component of the background noises is stored in a memory 6 through a Fourier conversion circuit 4, a switch 5, which is connected to a contact point (a), and the like. When the vicinity of the fixed position is scanned, the frequency component of the detected output at every scanning position by the sensor 2 is stored in a memory 7. The contents of the memories 6 and 7 are operated at every corresponding frequency component by a signal processing circuit 8. Then, the surface shape can be accurately measured without the effects of vibrations, noises,and the like, through an inverse Fourier converter 9, a surface-roughness detecting device 10, and the like.
COPYRIGHT: (C)1984,JPO&Japio
摘要翻译：目的：通过检测背景噪声的频率分量，并且当扫描样本时，从检测到的输出的频率分量进行减法处理，高精度地测量表面的形状，而不会产生诸如振动和噪声的干扰。构成：将传感器2的探针接触并固定在样品1的表面。在该状态下，检测出样品1的背景噪声。背景噪声的每个频率分量通过傅里叶变换电路4，连接到接触点（a）的开关5等存储在存储器6中。当扫描固定位置附近时，传感器2在每个扫描位置检测到的输出的频率分量被存储在存储器7中。存储器6和7的内容通过信号在每个对应的频率分量然后，可以通过逆傅立叶变换器9，表面粗糙度检测装置10等而不受振动，噪声等的影响来精确地测量表面形状。

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