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41. 发明专利

JPH04285727A MAGNETIC DISK DEVICE 失效
公开(公告)号：JPH04285727A
公开(公告)日：1992-10-09
申请号：JP5108291
申请日：1991-03-15
申请人： HITACHI LTD
发明人： GOMI KENICHI , SUGIMOTO HIROYUKI , TANAKA HIDEAKI , SAWAHATA SHOICHI
IPC分类号： G11B5/72 , G11B5/64 , G11B5/725 , G11B5/73 , G11B5/82
摘要： PURPOSE:To provide the magnetic disk device constituted to maintain the float ing stability of a magnetic head over a long period of time by decreasing the friction force and attraction force of the magnetic head of a high-performance magnetic recording device which is small in the floating quantity of the mag netic head and is high in the rotating speed of a magnetic recording medium. CONSTITUTION:The magnetic recording medium 11 of the magnetic recording device including the magnetic recording medium 11 and the magnetic head 12 is formed by laminating a magnetic layer 4 and a protective layer 5 on a nonmagnetic base body. The protective layer 5 and the slider material of the magnetic head 12 are selected from the combinations of materials having 0.05 to 0.6 coefft. of static friction between the two materials. The protective layer 5 is selected from the materials which have >=50 deg. contact angle with water after being coated with a fluorine liquid lubricant. The magnetic recording medium 11 for which such protective layer 5 is used.

42. 发明专利

JPH04238686A LASER BEAM MACHINE AND PROCESSING METHOD THEREOF 失效
公开(公告)号：JPH04238686A
公开(公告)日：1992-08-26
申请号：JP89991
申请日：1991-01-09
申请人： HITACHI LTD
发明人： TERABAYASHI TAKAO , TANAKA HIDEAKI , OSHIDA YOSHITADA
IPC分类号： B23K26/12 , B23K26/14 , G02B26/10
摘要： PURPOSE:To increase the throughput of Laser beam processing and to decrease the number of positioning times of a mask as well as to enhance processing accuracy by setting the beam size of a laser beam at a proper size to increase an energy density and projecting this laser beam to the mask. CONSTITUTION:The laser beam 11 is collimated into collimated beams of light of the cross-sectional area having the area smaller than the vertical and horizontal lengths of the processing pattern range of the mask. The collimated beams of light are projected and scanned perpendicularly to the processing pattern surface. The collimated beams of light are formed to the sectional shape smaller than the aperture diameter of a projecting optical system 29 for projecting these beams to a sample 15. Further, when the collimated beams of light are made incident in parallel with the optical axis of the projecting optical system 29, the exit light thereof is made to emerge in parallel with the optical axis of the projecting optical system 29. In addition, the collimated beams of light are scanned by an operating mirror 26 which is provided at the focal position of the incident optical system 29 of the mask 12 and chanegs its angle around twin axes.

43. 发明专利

JPH04129025A MAGNETIC DISK AND PRODUCTION THEREOF 失效
公开(公告)号：JPH04129025A
公开(公告)日：1992-04-30
申请号：JP24699690
申请日：1990-09-19
申请人： HITACHI LTD
发明人： GOMI KENICHI , TANAKA HIDEAKI , SUGIMOTO HIROYUKI , IGA TAKASHI
IPC分类号： G11B5/82 , G11B5/64 , G11B5/73 , G11B5/84
摘要： PURPOSE:To decrease the friction force and attraction force of the magnetic disk with and to a magnetic head and to maintain the floating stability of the magnetic head over a long period of time by forming the patterns to decrease the contact area with the slider surface of the magnetic head on the surface of a protective layer via a mask. CONSTITUTION:Oxygen ion beams 7 are cast via the mask 6 having the patterns controlled in the disposition of apertures and non-apertures on the surface of the surface protective layer 5 of the magnetic disk 8 to form surface rugged shapes along the patterns on the mask 6 on the surface of the protective layer 5. Only the hilly parts, therefore, directly face the head and the area ratio at which the magnetic head 8 comes into contact with the head can be decreased. The friction force and attraction force with and to the head are consequently lowered. Further, the fluctuation in the floating quantity of the head is lessened and the floating stability of the head over the entire surface of the magnetic disk 8 is assured by nearly uniformly disposing the formed hills. The fluctuation in the output by the fluctuation in the floating quan tity is thus prevented. The friction force and attraction force with and to the head are lowered in this way and the floating stability of the head is assured. The deteriora tion in the characteristics is lessened over a long period of time.

44. 发明专利

JPH03295086A MAGNETIC DISK DEVICE AND MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH03295086A
公开(公告)日：1991-12-26
申请号：JP9644890
申请日：1990-04-13
申请人： HITACHI LTD
发明人： GOMI KENICHI , TANAKA HIDEAKI , SAWAHATA SHOICHI , OURA MASAKI , MIYAKE YOSHIHIKO , KATO YOSHIKI , UTA KATSUO
IPC分类号： G11B5/82 , C09D5/23 , C09D7/12 , G11B5/64 , G11B5/65 , G11B5/73 , G11B5/738 , G11B21/21 , G11B25/04
摘要： PURPOSE:To maintain the floating stability of a magnetic head over a long period by making a part surrounded by plural slots to be flat substantially, selecting a ratio of integrated area of projections in projection regions to be a specific range and selecting the height of the projections to be within a prescribed height. CONSTITUTION:Plural continuous or discontinuous slots are provided on the surface of a disk 14 and parts surrounded by the slots are formed substantially flat. Then a ratio of integrated area of projections 7 in the unit of area in projection regions is selected to be 0.5% or over and 90% or below, and the height of the projections is selected to be almost same within a range higher than 5nm and lower than 40nm. Moreover, the magnetic disk 14 and the magnetic head are opposite to each other during rotation at a minute gap of 0.01 - 0.2mum and supported by a slider. Then the floating quantity of the head is selected to be 0.15mum or below to make the recording density of the magnetic disk 14 high.

45. 发明专利

JPH03263613A MAGNETIC RECORDING MEDIUM AND ITS DEVICE 失效
公开(公告)号：JPH03263613A
公开(公告)日：1991-11-25
申请号：JP6099490
申请日：1990-03-14
申请人： HITACHI LTD
发明人： GOMI KENICHI , TANAKA HIDEAKI , SAWAHATA SHOICHI , KONDOU MAKI , KONDO MASAKAZU
IPC分类号： G11B5/72 , G11B5/64 , G11B5/725 , G11B5/738 , G11B5/82 , G11B25/04
摘要： PURPOSE:To obtain excellent sliding resistance, and to prevent the permeation of corrosive gas such as moisture by using such a film incorporating carbon, silicon and at least one element selected from groups Ib, IIa, IIIa, IIIb, IVa, IVb, Va, Vb, VIa, VIb of the periodical table as a protective layer. CONSTITUTION:This medium is a magnetic recording medium where a magnetic layer 4 is provided on a nonmagnetic substrate, and protective layer 5 is provided on the substrate. The protective layer 5 is a film incorporating at least carbon, silicon together with at least one element selected from groups Ib, IIa, IIIa, IIIb, IVa, IVb, Va, Vb, VIa, VIb of the periodical table. By using this film having excellent denseness and high hardness as the protective layer, the obtd. medium is excellent not only in sliding resistance and corrosion resistance but in the holding property for a lubricant, thereby, the medium can keep the high reliability for a long period.

46. 发明专利

JPH03226392A LASER BEAM MACHINING METHOD 失效
公开(公告)号：JPH03226392A
公开(公告)日：1991-10-07
申请号：JP1901890
申请日：1990-01-31
申请人： HITACHI LTD
发明人： TANAKA HIDEAKI , TERABAYASHI TAKAO , ASAO HIROSHI
IPC分类号： G02B27/00 , B23K26/00 , B23K26/067 , G02B3/00
摘要： PURPOSE:To machine a large quantity of materials to be machined having holes or grooves with satisfactory efficiency and yield by using an optical element which splits a laser beam locally and into plural parts and converges the beams to machine the plural holes or grooves at the same time. CONSTITUTION:A part having an uniform energy distribution of the laser beam 2 having short wavelength is taken out through a slit 3. A transfer slit 7 is then irradiated with this beam and optional hole or groove shapes are formed on a circuit substrate 8. At this time, the transfer slit 7 has characteristics in which its shape, etc., are not changed even if it is used repeatedly. Accordingly, a large quantity of materials to be machined having the holes or grooves can be machined at the optional arrangement with satisfactory efficiency and yield.

47. 发明专利

JPH03154397A PROCESSING METHOD FOR CIRCUIT BOARD 失效
公开(公告)号：JPH03154397A
公开(公告)日：1991-07-02
申请号：JP29230289
申请日：1989-11-13
申请人： HITACHI LTD
发明人： TANAKA HIDEAKI , TERABAYASHI TAKAO
IPC分类号： H05K3/00 , H05K3/46
摘要： PURPOSE:To efficiently process holes in a large area and high density circuit board by irradiating a defective part of an electrically conductive layer or an insulating layer of a multilayer circuit substrate with laser light after hole processing to carry out modifying processing of the defective part. CONSTITUTION:When there is a defective part 5 in a transferring pattern 12, the board surface is illuminated by light and the reflected light 6 thereof is received by a light receiving element array 7, etc., to obtain a hole pattern, and said hole pattern is compared with a hole pattern of a nondefective to determine the position of the defective part 5. Then, the light from a laser generator 8 is converged by a reflecting mirror 10 and a condenser lens 11 to irradiate each defective part 5 and when the light passes through the hole a nondefective can be obtained. Thus, only the defective parts among collectively processed many holes can be selectively processed so that the irradiation time of the laser can be reduced and the overheating of the board can be prevented.

48. 发明专利

JPH01269224A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH01269224A
公开(公告)日：1989-10-26
申请号：JP9561988
申请日：1988-04-20
申请人： HITACHI LTD
发明人： TAKEUCHI SEIJI , GOMI KENICHI , SAITO YUKIO , SAWAHATA SHOICHI , TANAKA HIDEAKI , HONCHI AKIO , MIYADERA HIROSHI
IPC分类号： G11B5/82 , G11B5/73 , G11B5/738 , G11B5/858
摘要： PURPOSE:To obtain a plating film having stable performance in a wide range of P content by forming a magnetic layer via the nickel-phosphorus plating layer on a nonmagnetic substrate of the magnetic recording medium and incorporating 0.05-1wt.% one kind selected from tin, manganese, indium, and antimony into said film. CONSTITUTION:The Ni-P plating film 110 is formed on the nonmagnetic substrate 100 consisting of aluminum, etc., of the magnetic recording medium and a chromium film 120 is provided thereon; further, the magnetic layer 130 is formed thereon. A surface protective film 140 is formed on the magnetic film 130 and at least one kind selected from the tin, manganese, indium, and antimony is incorporated at 0.05-1wt.% into the Ni-P plating film 110 formed on the substrate 100. The magnetic recording medium exhibits practicable heat resistant and nonmagnetic characteristics even if the P below the eutectic point of Ni-P is incorporated therein. The plating film having the stable performance in the wide range of the P content is thus obtd.

49. 发明专利

JPH01229961A AIR-FUEL RATIO DETECTING APPARATUS 失效
公开(公告)号：JPH01229961A
公开(公告)日：1989-09-13
申请号：JP5702788
申请日：1988-03-10
申请人： HITACHI LTD
发明人： TANAKA HIDEAKI , NISHIMURA SHIGEOKI , SAITO YUKIO , KAWAGOE HIROSHI , MIYADERA HIROSHI
IPC分类号： G01N27/00 , F02D41/00 , F02D41/14 , G01N27/41
摘要： PURPOSE:To make it possible to perform highly accurate detection regardless of burning conditions, by making exhaust gas reaching a diffused resistor flow through a reformed catalyst layer. CONSTITUTION:Electrodes 3 are deposited and formed on the front and rear surfaces of a solid state electrolyte 4. One electrode 3 is in contact with exhaust gas through a diffused resistor 2. A reformed catalyst layer 1 is arranged on the side of the resistor 2. The exhaust gas 7 is flowed to the side of the resistor 2 through the catalyst layer 1. In the catalyst layer 1, an aluminum honeycomb is used as a support, and Ni and Fe2O3-CrO3 are supported as the catalyst components. The catalyst layer 1 is provided in the vicinity of the exhaust gas port of an engine and heated to about 500 deg.C from the outside. The compositions of the exhaust gas 8 through the catalyst layer 1 are measured under the following three kinds of burning conditions: in the idling state after warming-up; in the idling state immediately after starting; at the number of rotations three times the idling after warming-up. As a result, the compositions of the exhaust gas 8 at a certain fuel-air ratio agree in any burning conditions of three kinds along the entire region from a lean to rich state. HC is not detected in any case.

50. 发明专利

JPH01155515A MAGNETIC DISK 失效
公开(公告)号：JPH01155515A
公开(公告)日：1989-06-19
申请号：JP31209887
申请日：1987-12-11
申请人： HITACHI LTD
发明人： TAKEUCHI SEIJI , GOMI KENICHI , SAWAHATA SHOICHI , TANAKA HIDEAKI , HONCHI AKIO , MIYADERA HIROSHI
IPC分类号： G11B5/82 , G11B5/73 , G11B5/738 , G11B5/84
摘要： PURPOSE:To decrease the number of the nodules to be generated on the surface of a plating film constituting an underlying layer by decreasing the content of metal in the underlying layer critically near the substrate surface. CONSTITUTION:An extremely thin plating layer is formed by executing preliminary plating for an extremely short period of time after the substrate is subjected to an activation pretreatment by the metal; thereafter, the metal on the plating film is removed by an acid treatment, etc., and the underlying layer is formed by executing regular plating. The content of the metal such as Zn in the underlying layer is, therefore, decreased critically near the substrate surface. The metal such as Zn deposited by the activation pretreatment of the substrate is thereby prevented from being taken into the plating film and the uniform plating layer which decreases the generation of the nodules is formed.

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