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1. 发明专利

JPH11148497A MOVING BLADE OF AXIAL FLOW COMPRESSOR 失效
公开(公告)号：JPH11148497A
公开(公告)日：1999-06-02
申请号：JP31482997
申请日：1997-11-17
申请人： HITACHI LTD
发明人： HAMATAKE HISASHI , KATO YASUHIRO
IPC分类号： F02C7/04 , F04D19/02 , F04D29/38
摘要： PROBLEM TO BE SOLVED: To lower the maximum Mach number caused by the acceleration of a back side of a blade, to weaken the shock wave and reduce the pressure loss, by making a radius of curvature of a back side blade face of specific % of a chord length from a front edge, smaller than a radius of curvature of the back side blade face from the specific % of the chord length to a rear edge. SOLUTION: In the maximum thickness position 16, a radius of curvature of a back side blade face 19 to a position of 50% of a chord length 15, is 0.6 times of a radius of curvature of a back side blade face 1A from a position of 20% of the chord length to a rear edge 12. The inflow air current 1 is temporarily decelerated by a front edge 11, then is accelerated on the back side blade face 19 between the front edge 11 of small radius of curvature and 20% of the chord length 15, and reaches 1.2 equal to the inflow Mach number near the front edge. Then the inflow air current exists in an area 1A of large radius of curvature of the back side blade face, so that the acceleration degree is reduced, the maximum Mach number is regulated to be 1.3 or below, and the total pressure loss caused by the shock wave can be reduced.

2. 发明专利

JPH11148304A WING PROFILE 失效
公开(公告)号：JPH11148304A
公开(公告)日：1999-06-02
申请号：JP31482897
申请日：1997-11-17
申请人： HITACHI LTD
发明人： KISHIBE TADAHARU , KATO YASUHIRO
IPC分类号： B64C21/00 , F01D5/14 , F01D9/02 , F15D1/12
摘要： PROBLEM TO BE SOLVED: To expand the operating range of a wing by suppressing the separation of air when an angle of attack is changed. SOLUTION: The trailing edge 3 of a wing 1 has cutouts or projections 9 for reducing the separation of air from a wing surface, which generate longitudinal vortexes 8 having axis in the direction of flow in the downstream of the wing 1. The introduction of longitudinal vortexes 8 flows the main stream in a separation region 6 to delay the expansion of the separation region 6. The longitudinal vortexes 8 diffuse vortexes 7 produced by the secondary stream to prevent the separation from a pressure surface 4 and a negative pressure surface 5 and the separation caused by the secondary flow to expand the operating range of the wing 1. The shape of the cutout or the projection may be trapezoidal, angular, or rectangular, and may be trapezoidal at the end of the wing and rectangular at the center of the wing.

3. 发明专利

JPH08249630A MAGNETIC RECORDING/REPRODUCING DEVICE 失效
公开(公告)号：JPH08249630A
公开(公告)日：1996-09-27
申请号：JP5119995
申请日：1995-03-10
申请人： HITACHI LTD
发明人： KATO YASUHIRO
IPC分类号： G11B5/53 , G11B5/29
摘要： PURPOSE: To allow using of a differential type magnetic head element and to facilitate mounting of a connector in magnetic recording-reproducing device having a multitrack type thin film head having 144 to 288 tracks or more. CONSTITUTION: Terminals 13-1,... 13-n of differential type MR elements 12-1,... 12-n of a multitrack type magnetic head 10 are connected to a group 14 of pads provided in one end of a flexible LSI device 16 and a connector 17 is connected to the other end of this device. The LSI device 16 is equipped with differential amplifier circuits 15-1,... 15-n of single-phase outputs which amplify reproduction signals from the MR elements 12-1,... 12-n discretely, on a flexible semiconductor base thereof. The total number of input terminals of the amplifier circuits 15-1,... 15-n is 2n, while the total number of output terminals thereof is (n).

4. 发明专利

JPH08167225A INFORMATION STORAGE DEVICE 失效
公开(公告)号：JPH08167225A
公开(公告)日：1996-06-25
申请号：JP30457494
申请日：1994-12-08
申请人： HITACHI LTD
发明人： KATO YASUHIRO , HAMAGUCHI KATSUHIKO , TAKANO KOJI
IPC分类号： G11B19/00
摘要： PURPOSE: To provide a storage and reproducing device having good operability. CONSTITUTION: A switch means 1 is provided in a wiring circuit from a motor control circuit 13 to a motor 4 in the device, and the switch means is turned on/off at an interval of 1msec-several tens sec. Moreover, the intervals for turning on/off the switch means is controlled by a switch control means 2 in accordance with the operating mode of the device. Consequently, the power consumption of the device under the recording and reproducing state can be lowered, and yet, average power consumption can be reduced without stopping the rotation of the motor, and also the lowering of a throughput is suppressed.

5. 发明专利

JPH08114199A AXIAL FLOW COMPRESSOR 失效
公开(公告)号：JPH08114199A
公开(公告)日：1996-05-07
申请号：JP25346094
申请日：1994-10-19
申请人： HITACHI LTD
发明人： YANAGIDA MITSUAKI , KATO YASUHIRO , TSUDA YOSHIHIRO
IPC分类号： F04D29/38
摘要： PURPOSE: To suppress peel of a vane surface, to enlarge the stable operation range of an axial flow compressor as the generation of a secondary flow between vanes is suppressed, and to improve efficiency. CONSTITUTION: The chord lengths 19 and 29 in the cross section and curvatures of radius 17 and 27 of a vane of the tip part of the vane are increased to a value lower than those of the central part 13 and the root part 15 of the vane. This constitution reduces a pressure difference between the belly side 20 and the back side 21 of the vane is decreased, whereby the occurrence of a secondary flow is suppressed, the efficiency of a compressor is improved, and a stable operation range is enlarged.

6. 发明专利

JPH0765303A MAGNETIC RECORDING METHOD AND MAGNETIC RECORDER 失效
公开(公告)号：JPH0765303A
公开(公告)日：1995-03-10
申请号：JP21060993
申请日：1993-08-25
申请人： HITACHI LTD , HITACHI MAXELL
发明人： TAKAYAMA TAKANOBU , YOSHIDA KAZUYOSHI , SUZUKI MIKIO , KATO YASUHIRO , KITAGAKI NAOKI , YANO AKIRA , OGAWA YOICHI , KITAGAMI OSAMU
IPC分类号： G11B5/02 , G11B5/09
摘要： PURPOSE:To provide a magnetic recording method and magnetic recorder capable of improving a reproduced output/medium noise ratio. CONSTITUTION:A magnetic recording medium having an axis of easy magnetization in the vertical direction or diagonal direction and a ring head having a gap length g1 are relatively moved at a speed v and recording currents of polarities inverting at every generation of a '1' of binary data are supplied to this ring head to magnetically record the binary data on the magnetic recording medium. The polarities of the recording currents are inverted with the neutral level time T for decreasing the recording currents without inverting the polarities in-between in this magnetic recording method. As a result, the reproduced output/medium noise ratio of even the conventional magnetic recording medium and magnetic head is improved. This method is particularly useful for high-density recording.

7. 发明专利

JPH0676226A MAGNETIC HEAD AND ITS PRODUCTION 失效
公开(公告)号：JPH0676226A
公开(公告)日：1994-03-18
申请号：JP23093092
申请日：1992-08-31
申请人： HITACHI LTD
发明人： OTOMO MOICHI , KATO YASUHIRO , MORIWAKI HIDETOSHI
IPC分类号： G11B5/127 , G11B5/187
摘要： PURPOSE:To provide the magnetic head having recording and reproducing characteristics suitable for high-density recording and excellent mass productivity. CONSTITUTION:Magnetic core half bodies 12, 12' deposited with ferromagnetic metallic films 11 on the slope of a core base body part 10 are joined and integrated via a gap material 13 in such a manner that these ferromagnetic metallic films are formed flush with each other. At least the parts down to the gap depth of the parts exclusive of the ferromagnetic metallic films on a tape-sliding surface 15 are constituted of a nonmagnetic packing material 16. The thickness of the ferromagnetic metallic film 11' in the part adjacent to the above- mentioned nonmagnetic packing material 16 of the tape-sliding surface is set smaller than the thickness of the ferromagnetic metallic film 11 deposited on the core base body part. Since ferrite is not exposed on the sliding surface, noises are small and since the cross section of the rear part magnetic circuit is large, recording and reproducing efficiency is high. Since post tracking width working is executed after the joined block is formed, the accuracy of the track width is high.

8. 发明专利

JPH03213696A PREVENTION DEVICE FOR ROTATION STALL OF COMPRESSOR 失效
公开(公告)号：JPH03213696A
公开(公告)日：1991-09-19
申请号：JP610390
申请日：1990-01-17
申请人： HITACHI LTD
发明人： ISHII HIROSHI , KASAHARA MASAYUKI , KASHIWABARA YASUNARI , KATO YASUHIRO
IPC分类号： F04D27/00 , F04D27/02
摘要： PURPOSE:To avoid rotation stall in a compressor provided with a plurality of stationary blade rows and moving blade rows by actuating an actuator through a signal from a microphone outside the main body, and opening/closing a blow off valve means on the discharge side. CONSTITUTION:A microphone 7 is fitted on the outside of a compressor 1, and sound generated from the compressor 1 is detected with this. High frequency noise of the output signal from the microphone 7 is cut off with a filter circuit 8, the alternating current signal is converted to the direct current signal corresponding to the magnitude of amplitude with a rectifying circuit 9, and it is output to an output discriminating circuit 10. Decided voltage over an instituted reference voltage value is output in the output discriminating circuit 10. An actuator 6 is actuated to open a blow off valve 5 only in case of input of a signal from the output discriminating circuit 10. Hereby, because the compressor 1 comes in no load condition by a sudden fall of pressure, rotation stall can be avoided immediately after generation of it.

9. 发明专利

JPH0196805A SIGNAL REGENERATING CIRCUIT 失效
公开(公告)号：JPH0196805A
公开(公告)日：1989-04-14
申请号：JP25364587
申请日：1987-10-09
申请人： HITACHI LTD
发明人： OUCHI YASUHIDE , NISHIYAMA NOBUMASA , SATO NAOKI , KATO YASUHIRO , KAMEYAMA TADAHIKO
IPC分类号： G11B5/02 , G11B20/10
摘要： PURPOSE:To increase the S/N of a regeneration signal and to execute the signal regeneration discrimination with a high reliability by inputting the regenerating output of one head into plural amplifiers. CONSTITUTION:The output of a head 1 is inputted to plural amplifiers 2-4, respective signal outputs are added by an adder 5, and after the waveform is processed by a waveform processing circuit 6, the output is converted to a digital reading data 50 by a discriminating circuit 7 and sent to a host control. As a result, respective amplifier noises are reduced and the S/N is improved.

10. 发明专利

JPS64394A DEVICE FOR PREVENTING SURGING IN COMPRESSOR 失效
公开(公告)号：JPS64394A
公开(公告)日：1989-01-05
申请号：JP15448487
申请日：1987-06-23
申请人： HITACHI LTD
发明人： KATO YASUHIRO , MATSUURA YUTARO , KASHIWABARA YASUNARI , NISHIJIMA YASUMASA , OTSUKA HARUHIKO
IPC分类号： F04D27/02
摘要： PURPOSE:To perform a surging prediction with high accuracy by providing an arithmetic processor for calculating a power changing ratio or a power equivalent amount changing ratio and also providing a controller for controlling the operational condition of a compressor. CONSTITUTION:An arithmetic processor 23 is provided for calculating a power changing ratio against a pressure ratio or suction flow rate at a revolutional number corrected by a constant, and a power equivalent amount changing ratio against a pressure ratio or suction flow rate at a revolutional number corrected by a constant with use of the outputs of respective detectors 17-22. A controller 25 for controlling the operational condition of a compressor 16 in such a way that at least one of the power changing ratio and the power equivalent amount changing ratio cannot exceed a limited value. Therefore, it is possible to perform the surging prediction with high accuracy.

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