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21. 发明专利

JPS62120918A METHOD AND DEVICE FOR CUTTING DIFFICULT-TO-CUT MATERIAL 失效
公开(公告)号：JPS62120918A
公开(公告)日：1987-06-02
申请号：JP26101985
申请日：1985-11-22
申请人： HITACHI LTD
发明人： YAMASAKA MINORU
IPC分类号： B24B53/00 , B23H5/00 , B23H5/08
摘要： PURPOSE:To cut a difficult-to-cut material of non-conductivity and hard fragility, by providing a work and a conductive material to be arranged spacing a dis tance and applying pulse voltage between the conductive material and a conduc tive rotary grinding wheel, to a surface of which machining fluid adheres, with the conductive material serving as an electrode. CONSTITUTION:A conductive material 2 is juxtaposed providing a space with a work 1, and a pulse voltage supply unit 7 applies pulse voltage between the conductive material 2 and a conductive rotary grinding wheel 3 through a brush 4. And a groove is cut while machining fluid 6 is injected from a machining fluid supply pipe 5 to a part where the conductive rotary grinding wheel 3 is adapted to the conductive material 2. Here a device generates an electric discharge between the conductive rotary grinding wheel 3 and the conductive material 2 through the machining fluid 6 while a dressing effect which removes blocking due to a metallic binding material, easily generated in an end face 8a and a side surface 8b, by electrochemical action. In this way, a hard fragile further non-conductive material difficult to be cut can be machined high accurate ly and high efficiently.

22. 发明专利

JPS61239104A METHOD AND INSTRUMENT FOR MEASURING SQUARENESS 失效
公开(公告)号：JPS61239104A
公开(公告)日：1986-10-24
申请号：JP8017385
申请日：1985-04-17
申请人： HITACHI LTD
发明人： YAMASAKA MINORU
IPC分类号： G01B11/26
摘要： PURPOSE:To execute a measurement with a high accuracy and easily by measuring the squareness by only an auto collimator placed so as to be opposed to an angle placed between the first and the second planes. CONSTITUTION:An auto collimator (AC) 5 is placed so as to be opposed to an angle placed between the first and the second planes 1, 2, and parallel rays 3, 4 are irradiated. In this state, an absolute value of a squareness alpha is derived from a difference 2alpha of display values of an image 3a and 4a of a cross line of reflected lights 3', 4' which are reflected by the second and the first planes 2, 1 from the first and the second planes and formed in the AC 5. Accordingly, by using only the AC 5, the absolute value of the squareness alpha of the angle placed between the first and the second planes 1, 2 can be measured with a high accuracy and easily.

23. 发明专利

JPS60113103A ANGLE MEASURING DEVICE 失效
公开(公告)号：JPS60113103A
公开(公告)日：1985-06-19
申请号：JP22063683
申请日：1983-11-25
申请人： HITACHI LTD
发明人： YAMASAKA MINORU
IPC分类号： G01B11/26
摘要： PURPOSE:To measure an angle easily with a high precision by arranging a reference block and an object to be measured on a rotary table close to each other and measuring the angle between two faces making a reference angle and the angle between two faces making the angle to be measured by an auto-collimator. CONSTITUTION:A reference block 2 where a reference angle alpha is made by two faces 2a and 2b and an object 3 to be measured where an angle theta to be measured is made by two faces 3a and 3b are arranged close to each other on a rotatable table 4, and an auto-collimator 1 is arranged on a base 5 on which the table 4 is placed, and the auto-collimator 1 is connected electrically to an operating device 14 and a display means 15, and a shutter 12 is arranged between the table 4 and the collimator 1 attachably and detachably and slidably. First, faces 2a and 3a are detected by the collimator 1 to obtain an angle theta1 between them, and next, the table is rotated at the angle alpha approximately, and an angle theta2 between faces 2b and 3b is obtained to calculate the angle theta in accordance with formula theta=alpha+theta1-theta2, and thus, close adhesion between faces 2b and 3a is unnecessary.

24. 发明专利

JP2002331452A POLISHING DEVICE AND MAGNETIC HEAD AND METHOD OF MANUFACTURE 审中-公开
公开(公告)号：JP2002331452A
公开(公告)日：2002-11-19
申请号：JP2001234358
申请日：2001-08-02
申请人： HITACHI LTD
发明人： SEKI TAKATERU , CHIBA HIROSHI , TAKAHASHI TOSHIO , TANAKA HIDEAKI , TAMURA TOSHIO , YAMASAKA MINORU , TAKAKURA AKIO
IPC分类号： B24B19/26 , B24B37/04 , B24B37/10 , B24B37/30 , B24B41/06 , B24B53/007 , B24B53/017 , G11B5/187 , G11B5/31 , G11B5/39 , B24B37/00
摘要： PROBLEM TO BE SOLVED: To provide a polishing device, and a polishing method capable of highly accurately polishing a floating surface of a magnetic head by reducing a machining level difference, and restraining the occurrence of a scratch in a low bar state of continuing a plurality of magnetic head sliders. SOLUTION: For attaining the purpose, an L-shaped slide plate for installing a work holder on a slide guide is firmly held by an angle adjusting device so as to almost regularly hold an angle formed by a polishing object surface of a work and a polishing surface of a polishing surface plate, a reciprocatably driving device for installing the angle adjusting device on a slider table is firmly held on a bridge, and this bridge is arranged in the shape of straddling the polishing surface plate.

25. 发明专利

JP2002269715A MAGNETIC HEAD AND ITS MACHINING METHOD 失效
公开(公告)号：JP2002269715A
公开(公告)日：2002-09-20
申请号：JP2001063661
申请日：2001-03-07
申请人： HITACHI LTD
发明人： SEKI TAKATERU , TAMURA TOSHIO , YAMASAKA MINORU , TAKAKURA AKIO
IPC分类号： G11B5/60 , G11B21/21
摘要： PROBLEM TO BE SOLVED: To reduce the effects of machined traces, for giving residual strain by machining formed on the backside of a magnetic head, on twist as much as possible in the floating magnetic head. SOLUTION: In the floating type magnetic head, the directions of machining traces formed by polishing given to the entire backside, being a surface opposite a floating surface, reverse to a magnetic disk are linearly aligned roughly along the longitudinal direction of the magnetic head or a direction orthogonal thereto.

26. 发明专利

JPH1196529A MAGNETIC HEAD AND MAGNETIC DISK DEVICE 失效
公开(公告)号：JPH1196529A
公开(公告)日：1999-04-09
申请号：JP25958497
申请日：1997-09-25
申请人： HITACHI LTD
发明人： KAWAKUBO YOICHI , OKADA TOSHIHIRO , WAKAGI YASUO , YAMASAKA MINORU , TAMURA TOSHIO , TASAKA KENJI
IPC分类号： G11B5/60 , G11B21/21
摘要： PROBLEM TO BE SOLVED: To shorten the spacing between an information recording and reproducing element and a magnetic disk without adding processing stages and to improve a recording density by forming >=2 layers of protective films on the outer side of this recording and reproducing element and partially changing the polishability thereof from near the recording and reproducing element. SOLUTION: A tapered surface 26 and a flat surface 25 are formed on the magnetic disk-facing surface side of a head substrate 22. A nonmagnetic ground surface film 21, a recording and reproducing element part 30 and >=2 layers of the upper protective films 1, 2 are formed on one of the flat surfaces. The polishability of these upper protective films is varied and carbon protective films 40 are formed on the side where these films face the magnetic disk. Since the polishability of the upper protective film 1 is smaller than that of the upper protective film 2, the part of the upper protective film 1 projects to the part of the upper protective film 2 and the part of the upper protective film 2 recesses to the flat surface by the polishing. As a result, the distance between the recording and reproducing element part 30 and the magnetic disk 10 is diminished.

27. 发明专利

JPH10143828A THIN-FILM MAGNETIC HEAD AND ITS PRODUCTION 失效
公开(公告)号：JPH10143828A
公开(公告)日：1998-05-29
申请号：JP29615596
申请日：1996-11-08
申请人： HITACHI LTD
发明人： YAMASAKA MINORU , HASHIMOTO AKIRA
IPC分类号： G11B5/40
摘要： PROBLEM TO BE SOLVED: To provide a method which prevents the degradation in the insulation characteristic from slider substrate materials by the dragging of metallic films at the time of separating and cutting from an element array state and at the time of grooving. SOLUTION: When a grinding wheel 14 is turned clockwise in separating, cutting and working of rails by grooving, heads 2 are so arranged that overcoating films come to a left side and slider substrates come to a right side. The abrasive grains of the grinding wheel 14 run from the slider substrate material side to the overcoating film side when the heads are worked. Then, even if the dragging of the metallic films arise in the case of cutting and working of the metallic films in the overcoating films, these films do not extend to the slider substrate material side and the insulation characteristic is maintained. The insulation characteristic of the metallic films and slider substrate materials in the elements of the thin-film magnetic heads 2 is well maintained and, therefore, the degradation in the recording and reproducing outputs of magnetic signals is prevented.

28. 发明专利

JPH0632887B2 失效
公开(公告)号：JPH0632887B2
公开(公告)日：1994-05-02
申请号：JP20140986
申请日：1986-08-29
申请人： HITACHI LTD
发明人： OKU TSUNEO , TAMURA TOSHIO , YAMASAKA MINORU , NOTO KOICHI
IPC分类号： B24B9/00 , B24B19/26 , B24B21/00

29. 发明专利

JPH0578802B2 失效
公开(公告)号：JPH0578802B2
公开(公告)日：1993-10-29
申请号：JP5224685
申请日：1985-03-18
申请人： HITACHI LTD
发明人： YAMASAKA MINORU
IPC分类号： G02B6/12 , G02B6/28 , G02B6/287 , G02B6/293

30. 发明专利

JPS6451273A GRINDING WHEEL 失效
公开(公告)号：JPS6451273A
公开(公告)日：1989-02-27
申请号：JP20403087
申请日：1987-08-19
申请人： HITACHI LTD
发明人： YAMASAKA MINORU , TAMURA TOSHIO
IPC分类号： B24D3/00
摘要： PURPOSE:To maintain the sharpness of a grindstone as well as to make favorable grinding performable by sintering and bonding plural sintered abrasive grains via a bonding material. CONSTITUTION:Fine powder diamond abrasive grains 1 of 2-4mum in mean grain size are sintered by 5-10 grains at a time at a temperature of about 600-1,000 deg.C with metal powder 6, forming a sintered abrasive grain group 2 making this metal powder a bonding material. This abrasive grain group 2 is sintered at the last sintered temperature or less than it with another metal powder 8, forming a grinding wheel 11 holding the abrasive grain group 2 with this metal powder 8 as a bonding material 4. At this time, bonding strength between the fine powder abrasive grain and the bonding material 7 is set to be smaller than that between the abrasive grain group 2 and the fine powder abrasive grain 1. In consequence, with the advance of grinding operation, an angular part of the fine powder abrasive grain 1 is worn out, and when load is imposed on this part grows large, the fine powder grain 1 falls off before the abrasive grain group 2 falls off, and adjacent fine powder grains 1 are projected to a surface of the grinding wheel 11 anew one after another, thus autonomous force is smoothly performed and each projection of abrasive grains 2 is smoothly performed.

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