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1. 发明专利

JP2002014120A INSTRUMENT FOR MEASURING HIGHER HARMONICS 失效
公开(公告)号：JP2002014120A
公开(公告)日：2002-01-18
申请号：JP2000197888
申请日：2000-06-27
申请人： HITACHI LTD , TOKYO ELECTRIC POWER CO
发明人： YASUKAWA SABURO , KAWASE MINORU , OGAWA KENJI , WATANABE MASAHIRO , OUCHIDA HIDEYA
IPC分类号： G01R15/14 , G01R15/18 , G01R23/20
摘要： PROBLEM TO BE SOLVED: To solve the problems that conventionally for practical use the size of an instrument becomes large and that a cost thereof becomes high, because impedances are required to be provided plurally instrument in matching with the order of the high-frequency waves to be measured. SOLUTION: This higher-harmonic measuring instrument 1 is markedly reduced in size, because the oscillation frequency is regulated using one oscillator 13a, while matching with the order of the high-frequency waves, by connecting a switch 13B between the higher-harmonic impedance Zan and the higher- harmonic measuring instrument 1, and by making the n-th order higher-harmonic current generated in the oscillator 13A connected between a current transformer 4 and a transformer 15 flow in the measuring instrument 1 by closing the switch.

2. 发明专利

JPH11174100A HARMONIC MEASURING DEVICE 失效
公开(公告)号：JPH11174100A
公开(公告)日：1999-07-02
申请号：JP34125297
申请日：1997-12-11
申请人： HITACHI LTD , TOKYO ELECTRIC POWER CO
发明人： YASUKAWA SABURO , KAWASE MINORU , MATSUI YOSHIAKI , KUMAKI SHINICHI , HASUMI TADAO
IPC分类号： G01R23/20 , G01R29/00 , G01R31/00 , G01R31/08
摘要： PROBLEM TO BE SOLVED: To calculate and specify a harmonic generation source in a power system by a simple method. SOLUTION: A harmonic measuring device 1 includes a detecting means 11 for detecting a harmonic current flowing in and out of a harmonic generating source 2 and harmonic voltage of the harmonic generating source 2, and a measuring means 12 for operating the detected harmonic current and harmonic voltage to calculate the harmonic generating source 2. The device further includes a varing means 13 for varying the detected harmonic current and harmonic voltage, and the measuring means 12 is adapted to operated the detected plural harmonic currents and harmonic voltages which are obtained by varying the varying means 3 to calculate the harmonic generating source 2.

3. 发明专利

JPH09154235A SYSTEM AND METHOD FOR CONTROLLING POWER TRANSMISSION AND DISTRIBUTION SYSTEM 失效
公开(公告)号：JPH09154235A
公开(公告)日：1997-06-10
申请号：JP552696
申请日：1996-01-17
申请人： HITACHI LTD
发明人： KANAI MINORU , YOSHIKAWA TOSHIFUMI , YASUKAWA SABURO , IMAMURA YUZURU , TANIFUJI SHINYA , AMANO MASAHIKO , WATANABE MASAHIRO
IPC分类号： H02J13/00 , H02J3/00 , H04Q9/00
摘要： PROBLEM TO BE SOLVED: To operate the system at high efficiency and optimize the system voltage and prevent troubles due to higher harmonic waves by leveling loads. SOLUTION: A control system of a power transmission and distribution system has a plurality of power receiving devices 89, each of which has a controller 91. The power receiving devices 89 have such a function as to generate active and reactive power of a fundamental wave and higher harmonic waves and to supply these powers to a distribution line and receive power from the distribution line. Furthermore, a first central controller for controlling the distribution line is installed in this system. The first central controller stores the information on the structure of the distribution line and collects the information on the on/off state at the present of a switch connected to the distribution line. For the amount of current and electricity on the distribution line, the first central controller sends unique and individual control command signals which it caused the power receiving devices 89 to generate based on the information stored and collected by itself, to the controllers 91 and thereby it makes an optimum cooperative control of the power transfer devices 89.

4. 发明专利

JPH07308036A METHOD AND SYSTEM FOR SUPERVISING DISTRIBUTION SYSTEM AND THEIR APPARATUS 失效
公开(公告)号：JPH07308036A
公开(公告)日：1995-11-21
申请号：JP6036595
申请日：1995-03-20
申请人： HITACHI LTD
发明人： KANAI MINORU , IMAMURA YUZURU , YASUKAWA SABURO , IWASHITA KIYOJI , TAKEI TORU , KUDO HIROYUKI , KAWAKAMI JUNZO , NISHIJIMA KAZUO , INOUE HIROSHI
IPC分类号： H02J13/00 , H02J3/00
摘要： PURPOSE:To realize an optimal supervision of a distribution system by determining the electrical amount of an electric facility connected with a distribution system accurately. CONSTITUTION:Electric amount of a distribution line 4 is measured at a point where a bus 2 is led out and the electrical amount to be transferred between the distribution line 4 and a specific electric facility connected therewith is measured. Electric amounts are then estimated for a plurality of sections of the distribution line 4 based on the measured electric amounts and management information relevant to a general electric facility connected with the distribution line 4 thus supervising the distribution system. Furthermore, an evaluation amount is determined based on a sectional electric amount obtained from means for determining the electric amount of the distribution line 4. The distribution system is then contracted for every hierarchy corresponding to the configuration using the evaluation value and a part to be improved is extracted using the contracted value.

5. 发明专利

JPH0626132B2 失效
公开(公告)号：JPH0626132B2
公开(公告)日：1994-04-06
申请号：JP7426485
申请日：1985-04-10
申请人： HITACHI LTD
发明人： DOI RYOTA , YASUKAWA SABURO , TSUKUI TSUTOMU , YAMAGUCHI MOTOO , SHIMIZU TOSHIO , IWAASA SHUZO
IPC分类号： G01N27/416 , H01M8/04

6. 发明专利

JPH0627867A PERSONAL EDUCATION MACHINE AND METHOD THEREFOR 失效
公开(公告)号：JPH0627867A
公开(公告)日：1994-02-04
申请号：JP18341892
申请日：1992-07-10
申请人： HITACHI LTD
发明人： SATO YOSHIO , MINEMURA HIROYUKI , TSUBOI NOBUYOSHI , SUGITA TATSUYA , FUSHIMI TETSUYA , YASUKAWA SABURO , TSUNODA YOSHITO
IPC分类号： G09B7/00
摘要： PURPOSE:To provide the educational machine and method which matching the individuality of a learner and serve as a tutor. CONSTITUTION:The educational machine and method are provided with means mentioned below to attain the purpose. (1) An optical disk on which items common to plural lessons are recorded in its ROM area 561 and learning records characteristic to the learner are recorded in its RAM area 562 is used. (2) The extent of understanding is decided by conducting an examination right after and a certain time after each unit is learnt to identify memorization characteristics of the learner and proper cycles of repetitive learning are set and displayed. (3) Similar problems which are solved in the past are stored and when one problem can not be solved, a similar problem which is solved in the past is displayed as a hint. (4) All problems which could not be solved in the past are stored and set again to assist the fixation of memorization.

7. 发明专利

JPH05234241A 失效
公开(公告)号：JPH05234241A
公开(公告)日：1993-09-10
申请号：JP3363992
申请日：1992-02-20
申请人： HITACHI LTD
发明人： TSUBOI NOBUYOSHI , MINEMURA HIROYUKI , SUGITA TATSUYA , FUSHIMI TETSUYA , YASUKAWA SABURO , SATO YOSHIO
IPC分类号： G11B7/085 , G11B7/095 , G11B19/20 , G11B19/22
摘要： PURPOSE:To provide the device of a thin-type in which an objective lens and an optical disk do not come into contact with each other by measuring a face wobbling of a loaded disk, and stopping a rotation of the disk when the result of measurement is above a value determined in advance. CONSTITUTION:A face wobbling measuring circuit is constituted by switching a switch 428 and a switch 427 to a B side and a D side, respectively. Subsequently, an objective lens 219 is retracted, a laser is turned on and an optical disk 140 is rotated, and a reflected light from the disk 140 is photodetected by a photodetector 221. In this case, the objective lens 219 is moved to a point where a focus error signal becomes '0', and this position (h) is inputted to a memory 402. To the memory 402, the objective lens position (h) and a motor rotating angle R at that time are inputted, and from these data, the maximum amplitude value of a face wobbling is measured. This value is compared with an allowable value T of an MPU 400, and when larger, a motor 240 is stopped, therefore, a collision does not occur and the device can be thinned by making the lens small.

8. 发明专利

JPH05159319A TRACKING SERVO PULL-IN DEVICE 失效
公开(公告)号：JPH05159319A
公开(公告)日：1993-06-25
申请号：JP31889891
申请日：1991-12-03
申请人： HITACHI LTD
发明人： FUSHIMI TETSUYA , SATO YOSHIO , YASUKAWA SABURO , TSUBOI NOBUYOSHI , MINEMURA HIROYUKI , SUGITA TATSUYA
IPC分类号： G11B7/085 , G11B21/10
摘要： PURPOSE:To stably pull in tracking servo in a tracking servo device. CONSTITUTION:In a state where a tracking servo loop is open, the time dT when a laser spot irradiating from an optical head 103 crosses the track on an optical disk 101 is measured by a counter 115; and by closing an analog switch 110 by a controller 106 within the period of time indicating more than the prescribed time, the tracking servo loop is closed. Thus, the tracking servo loop is stably pulled in.

9. 发明专利

JPH0535680B2 失效
公开(公告)号：JPH0535680B2
公开(公告)日：1993-05-27
申请号：JP22864387
申请日：1987-09-14
申请人： HITACHI LTD
发明人： HONDA TATSUO , SUZUKI YASUAKI , YASUKAWA SABURO , TAKEI TOORU , HORI YASURO , OOISHI KAZUYA
IPC分类号： B41J2/325 , B41J2/525 , B41J11/02 , B41J11/14 , B41J11/66 , H04N1/04 , H04N1/12 , H04N1/23

10. 发明专利

JPH04245029A OBJECTIVE LENS DRIVE DEVICE AND OPTICAL HEAD AND INFORMATION PROCESSING DEVICE USING IT 失效
公开(公告)号：JPH04245029A
公开(公告)日：1992-09-01
申请号：JP960391
申请日：1991-01-30
申请人： HITACHI LTD
发明人： MINEMURA HIROYUKI , SATO YOSHIO , TSUBOI NOBUYOSHI , YASUKAWA SABURO , SUGITA TATSUYA , FUSHIMI TETSUYA , ICHIKAWA KOJI
IPC分类号： G11B7/00 , G11B7/004 , G11B7/085 , G11B7/095 , G11B7/135
摘要： PURPOSE:To enable a device to be thin by using an objective lens with an effective beam diameter of 3.5mm or less and a disk substrate thickness of 1mm or less for an optical system of an optical disk. CONSTITUTION:A movable portion of a two-dimensional actuator consists of an objective lens 50, a counter weight 190, two focus coils 140, and four tracking coils. The movable portion is retained by using two sets of upper and lower springs 110. A magnetic circuit consists of a magnet 150 and a yoke 160 and a magnetic flux produced by the magnetic circuit penetrates through the focus coil 140 and a tracking coil 130. The optical system can be made thinner by reducing beam diameter. When an optical system with a beam diameter of 3.5mm or less (for example, 2mm), an optical substrate thickness of 0.8mm, and a working distance of 0.4mm is used, a thickness of the actuator becomes 5mm and that of the optical head becomes 6mm, thus achieving an optical disk device which is 15mm thick or less.

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