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1. 发明专利

JP2002305611A ACCOUNTING MANAGEMENT SYSTEM 失效
公开(公告)号：JP2002305611A
公开(公告)日：2002-10-18
申请号：JP2001106624
申请日：2001-04-05
申请人： HITACHI LTD
发明人： KANDA KOJI , FUJIE TOSHIAKI , AOYAMA TAKAHIDE
IPC分类号： H04M15/28 , H04M15/00 , H04M15/34 , H04W4/12 , H04W4/24 , H04W4/26 , H04Q7/38
摘要： PROBLEM TO BE SOLVED: To provide an accounting state confirmation system which enables a contractant to confirm the accounting states of mobile terminals of telephone numbers more different from that of a contractant's terminal, which are used by one or more non-contractants on a side to be managed, in real time, and to provide an accounting management system which enables the contractant to prevent the mobile terminals used by the one or more non-contractants on the side to be managed from being excessively used. SOLUTION: In the accounting state confirmation system, the mobile terminal owned by the contractant being a management side can confirm the accounting states of the mobile terminals used by the one or more non-contractants on the side to be managed in real time by communication (telephone line used) between the mobile terminal owned by the contractant being the management side and the mobile terminals used by the one or more non-contractants on the side to be managed. In the accounting management system, the mobile terminal owned by the contractant being the management side can freely set the approval/refusal of the use of the mobile terminals used by the one or more non-contractants on the side to be managed and can prevent the mobile terminal used by the one or more non-contractants on the side to be managed from being excessively used.

2. 发明专利

JP2002134292A LIGHTING EQUIPMENT 失效
公开(公告)号：JP2002134292A
公开(公告)日：2002-05-10
申请号：JP2000328010
申请日：2000-10-27
申请人： HITACHI LTD , HITACHI INFORMATION TECHNOLOGY
发明人： OSHIMA TOSHIYOSHI , FUJIE TOSHIAKI
IPC分类号： H05B41/24 , H02M7/538 , H05B41/16
摘要： PROBLEM TO BE SOLVED: To provide lighting equipment for cathode-ray tubes, which can carry out direct-current lighting without degrading life of the cathode-ray tube by making influence of floating capacity into the minimum, and preventing generating of a cataphoresis phenomenon. SOLUTION: The lighting circuit for carrying out direct-current lighting, consists of the cathode-ray tube DL, the direct-current power supply, which generates the voltage, which can maintain lighting of the cathode-ray tube DL, and switching elements Q3 and Q4, which change the output voltage from the direct-current power supply to plus and minus on the basis of zero with a predetermined cycle and the like. The voltage impressed to one electrode of the cathode-ray tube DL is changed to the polarity of plus or minus on the basis of zero, and the electrode of another side is set as a value near zero or zero. By this, the polarity can be reversed with a predetermined cycle, without switching directly the voltage impressed to the cathode-ray tube DL with physical switches, such as a semiconductor switching element, a relay, or the like.

3. 发明专利

JPH09172778A DC POWER SUPPLY APPARATUS 失效
公开(公告)号：JPH09172778A
公开(公告)日：1997-06-30
申请号：JP32738995
申请日：1995-12-15
申请人： HITACHI LTD
发明人： FUJIE TOSHIAKI
IPC分类号： H02M7/217 , H02J1/10 , H02M1/08 , H02M1/42 , H02M3/155 , H02M7/06 , H02M7/12
摘要： PROBLEM TO BE SOLVED: To eliminate the malfunctioning caused by the output fluctuation of the step-up converter of a step-up type two-converter system DC power supply apparatus. SOLUTION: A DC power supply apparatus includes a step-up converter which is composed of rectifying diodes 2 which are connected to an AC input 1 through an input switch 16 and a controller 17 and an insulated type DC-DC converter 8 which is connected to the next stage of the step-up converter. A first controller which is composed of a shunt regulator 20, voltage dividing resistors 21 and 22 for obtaining the control voltage of the shunt regulator 20, a photocoupler 19 which is turned on and off by the shunt regulator 20 and a resistor 18 is provided between the step-up converter and the insulated type DC-DC converter 8. If the DC output voltage Vo of the step-up converter exceeds a predetermined value, the photocoupler 19 operates a REMOTE-ON /OFF signal through a remote control terminal 8a to start the insulated type DC-DC converter 8.

4. 发明专利

JP2002100491A INVERTER CIRCUIT 失效
公开(公告)号：JP2002100491A
公开(公告)日：2002-04-05
申请号：JP2000295436
申请日：2000-09-25
申请人： HITACHI LTD , HITACHI INFORMATION TECHNOLOGY
发明人： AOYAMA TAKAHIDE , OSHIMA TOSHIYOSHI , FUJIE TOSHIAKI
IPC分类号： H05B41/24 , H02M7/48 , H02M7/538 , H05B41/392
摘要： PROBLEM TO BE SOLVED: To provide an inverter circuit for varying frequency, for setting an optimal switching frequency and controlling and setting the switching frequency at time of minimum input current, by detecting input current at that time, for finding a proper place of an inverter as judging conditions. SOLUTION: This inverter circuit has an arithmetic circuit for increasing/ decreasing the switching frequency of the inverter circuit, a circuit for setting the switching frequency, a detecting circuit arranged for finding the optimal frequency and a switching frequency control circuit for controlling these circuits for setting an optimal lighting frequency of respective discharge lamps.

5. 发明专利

JP2001013878A DISPLAY DEVICE 失效
公开(公告)号：JP2001013878A
公开(公告)日：2001-01-19
申请号：JP18558999
申请日：1999-06-30
申请人： HITACHI LTD
发明人： IGARASHI TAKESHI , YOSHIKAWA HIROKI , KOIZUMI NAOHISA , SUZUKI HITOSHI , FUJIE TOSHIAKI , OIKAWA HIRONORI , IWATA NAOSHI
IPC分类号： G02B13/18 , G02B3/08 , G02F1/13 , G02F1/1335 , G02F1/13357 , G03B21/00 , G09F9/00 , G09F9/40
摘要： PROBLEM TO BE SOLVED: To obtain a display device in which a large screen having no irregular brightness can be obtained by converting rays again into almost parallel beams near the screen to illuminate the screen almost perpendicular to the screen. SOLUTION: The display device consists of back light units 11a to 11d which emit almost parallel beams, transmission type liquid crystal panels 12a to 12d which can display specified images, microlens arrays 13a to 13d, 14a to 14d to produce erect images, Fresnel concave lenses 15a to 15d to enlarge and project the images, Fresnel convex lenses 16a to 16d to convert the rays into almost parallel light again, and a lenticular sheet 17 as a screen. In this device, the images in the display part of the transmission liquid crystal panels 12a to 12d arranged on a panel are enlarged while the space between images are reduced, and then projected on the lenticular sheet 17 while converting again the light beams into almost parallel beams.

6. 发明专利

JPS6379118A POWER UNIT 失效
公开(公告)号：JPS6379118A
公开(公告)日：1988-04-09
申请号：JP22353486
申请日：1986-09-24
申请人： HITACHI LTD
发明人： OMORI TETSUO , FUJIE TOSHIAKI
IPC分类号： G05F1/10 , G06F1/00 , G06F1/26
摘要： PURPOSE:To reduce the outflow of an abnormal current with an electronic computer by estimating the transient current fluctuation produced intermittently from the change of a bus signal and comparing said current fluctuation with the value set previously to control a spare constant current source, etc. CONSTITUTION:The estimated value data with which occurrence of the current fluctuation is estimated is stored in a memory 13 from a logic part of a computer. At the same time, the estimated value data corresponding to the command code of a bus signal is stored in a register 14. The higher 4 bits of the register 14 are connected to a decoder 36 for switch of the voltage of each power supply. While the lower 4 bits of the register 14 are supplied to a control type constant current source 19 via a D/A converter 51. Thus the current fluctuation of a constant voltage source 16 is compensated by the source 19 based on said estimated value data. Thus it is possible to eliminate the change of a data bus signal owing to occurrence of abnormality and therefore to prevent the outflow of an abnormal current caused by the short circuit of DC output, etc.

7. 发明专利

JPS5895934A DC POWER SOURCE SUPPLY CIRCUIT 失效
公开(公告)号：JPS5895934A
公开(公告)日：1983-06-07
申请号：JP19291981
申请日：1981-12-02
申请人： HITACHI LTD
发明人： FUJIE TOSHIAKI
IPC分类号： H02J1/00

8. 发明专利

JPH1056738A POWER FACTOR IMPROVING RECTIFIER CIRCUIT 失效
公开(公告)号：JPH1056738A
公开(公告)日：1998-02-24
申请号：JP20956796
申请日：1996-08-08
申请人： HITACHI LTD , HITACHI COMPUTER ENG
发明人： FUJIE TOSHIAKI , SATO FUMINORI
IPC分类号： H02H9/04 , H02J3/18 , H02M7/06 , H02M7/12
摘要： PROBLEM TO BE SOLVED: To prevent overshoot voltage appearing just after the power is turned on by means of a small-size load comprising only a few components by installing an overvoltage protective circuit for suppressing excessive rectified and smoothed voltage in parallel with a rectifying and smoothing capacitor. SOLUTION: An overvoltage protective circuit which is a serial combination of a resistor R1 and a varistor VDR, a surge absorbing element, in parallel with a rectifying and smoothing capacitor Ci. When a switch SW is closed and the power is turned on, for example, at a time t0 when a positive period of AC input voltage starts, AC input current during a period t0-t4 which is a first positive period of the AC input voltage becomes excessive rush current due to charging of the smoothing capacitor Ci. However, such conduction voltage as to prevent extreme overshoot voltage is selected for the varistor VDR and therefore overshoot voltage is absorbed by the varistor VDR and the current limiting resistor R1.

9. 发明专利

JPH0360180A PRINTED WIRING BOARD 失效
公开(公告)号：JPH0360180A
公开(公告)日：1991-03-15
申请号：JP19412289
申请日：1989-07-28
申请人： HITACHI LTD
发明人： FUJIE TOSHIAKI
IPC分类号： H01C7/04 , H05K1/02 , H05K1/16
摘要： PURPOSE:To make a printed circuit simpler in constitution, smaller in size, and higher in reliability by providing a heat sensitive element having a negative resistance temperature characteristic to the cable connecting a power supply input terminal and the printed circuit with each other. CONSTITUTION:When a printed circuit board 3 is inserted into output terminals 2a and 2b of a connector 2, the positive-side and negative-side input terminals 2c and 2d of the connector 2 are respectively connected with terminals 2a and 2b, and thus, an electrically connected state is set between them. Since the output current of a DC power source 1 flows through a loop formed of a positive-side output bus 1a, the terminals 2a and 2c, a heat sensitive element 5, a logic circuit 4, the terminals 2b and 2d, and a negative-side output bus 1b, the electric power feeding quantity is controlled by means of the impedance of the element 5 and the output voltage does not drop abruptly. After inserting the wiring board 3, the element 5 itself produces heat and the resistance value of the element 5 gradually drops. Accordingly, the electric power feeding quantity to the printed wiring board 3 increases and reaches the maximum when the temperature rise of the element 5 reaches the saturation. Therefore, electric power can be supplied continuously in a stable state to another printed circuit boards also.

10. 发明专利

JPS61196770A PROTECTING CIRCUIT OF CAPACITOR DISCHARGING CIRCUIT 失效
公开(公告)号：JPS61196770A
公开(公告)日：1986-08-30
申请号：JP3634085
申请日：1985-02-27
申请人： HITACHI LTD
发明人： KONO NAOFUMI , FUJIE TOSHIAKI
IPC分类号： H02H7/20 , G05F1/10 , H02M7/06 , H02M7/12
摘要： PURPOSE:To effectively detect the malfunction of a switch element by adding means for detecting a current flowed to a discharging resistor in a circuit for connecting the resistor with a capacitor in an electronic device only when the device is interrupted from a power source. CONSTITUTION:A transistor 11 is turned OFF by opening a power switch 14, and a relay 2 and photocouplers 8, 10 are turned OFF to disconnect an AC power source 1 from a rectifier. When the photocoupler 8 is turned OFF, a transistor 7 is turned ON to discharge a capacitor 4 through a resistor 5. If a current is flowed to the resistor 5 when a power switch 14 is closed to energize the relay 2 ON, a photocoupler 9 is turned ON, and an SCR 12 is triggered. Thus, the transistor 11 is turned OFF to deenergize the relay 2.

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