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1. 发明专利

JPS61294916A AMPLIFIER CIRCUIT 失效
公开(公告)号：JPS61294916A
公开(公告)日：1986-12-25
申请号：JP13416285
申请日：1985-06-21
申请人： HITACHI LTD , HITACHI MICROCUMPUTER ENG
发明人： SATO TETSUO , TAKESHITA RITSUJI , TSUCHIYA MITSUNORI
IPC分类号： H03G3/30 , H03G5/02 , H03K5/02
摘要： PURPOSE:To vary the amplification gain by the current control by comparing a feedback current of an operational amplifier with a reference current of a voltage follower so as to vary the resistance value of the voltage follower thereby varying the gain of the operational amplifier corresponding to the varied resistor. CONSTITUTION:The relation expressed in equation 1 exists between an input signal Vin and an output signal Vout of an amplifier A1 and a gain Gv is decided by equation (2). A resistor R4 consists of the voltage follower and when the input signal Vin rises and the resistance value is regarded as a infinite value, the gain is varied with Gv 1 from the equation (2). That is, the output voltage is limited in the amplifier A1 according to the level change of the input signal Vin. When the output impedance of the voltage follower 1 is regarded nearly as re (emitter resistor of a transistor Q1 or Q2) when the relation of Ix

2. 发明专利

JPS62264721A TRANSISTOR SWITCH CIRCUIT 失效
公开(公告)号：JPS62264721A
公开(公告)日：1987-11-17
申请号：JP10661886
申请日：1986-05-12
申请人： HITACHI MICROCUMPUTER ENG , HITACHI LTD
发明人： KABASAWA KIYOSHI , SATO TETSUO
IPC分类号： H03K17/60
摘要： PURPOSE:To change over a low output impedance and a high output impedance by applying simultaneously on/off control to transistors (TRs) connected in cascade in response to the level change of a control signal. CONSTITUTION:When a control signal Vc is at a high level, TRs Q11, Q12 are turned on at the same time. Then no bias voltage is applied to a TR Q14 by the voltage drop of a resistor R11 and the TR Q14 is turned off. Further, a base current is supplied to a TR Q13 via a resistor R12 and the TR Q13 is turned on. Then a bias current is fed to the TR Q12 via a resistor R1 and a collector series resistor rcs of the TR Q12 is small. That is, a terminal No.3 being an output terminal is connected to ground via the resistor rcs. Om the other hand, when the control signal Vc goes to a low level, the output impedance is high.

3. 发明专利

JPS62194734A ELECTRONIC DEVICE 失效
公开(公告)号：JPS62194734A
公开(公告)日：1987-08-27
申请号：JP3518186
申请日：1986-02-21
申请人： HITACHI MICROCUMPUTER ENG , HITACHI LTD
发明人： KITAMURA HIROICHI , MATSUSHIMA TADASHI , SATO TETSUO
IPC分类号： H03K19/00 , H03K19/091
摘要： PURPOSE:To facilitate the testing by providing separately a control circuit for driving an interface circuit between plural mode selection logic circuits and plural load driving interface circuits. CONSTITUTION:A control circuit 13 receiving a control signal Vc different from a mode selection signal Vin is provided between plural logic circuits 11a-11n receiving a mode selection signal and applying logic operation corresponding to the selection signal and plural interface circuits 22a-22n driving plural load circuits 23a-23n corresponding to the mode selection signal by an output signal from the circuits 11a-11n. In selecting an output signal Vout obtained from the circuits 22a-22n to a high level, a switch SW is turned off, the signal Vc is brought into a high level thereby bringing all of outputs signals of the circuits 22a-22n to a high level without driving the circuits 11a-11n.

4. 发明专利

JPS61148917A SWITCH CIRCUIT 失效
公开(公告)号：JPS61148917A
公开(公告)日：1986-07-07
申请号：JP27092084
申请日：1984-12-24
申请人： HITACHI LTD , HITACHI MICROCUMPUTER ENG
发明人： SATO TETSUO , WATANABE TOSHIHIKO , TSUCHIYA MITSUNORI
IPC分类号： H03K17/74
摘要： PURPOSE:To attain ease of circuit integration by using a control circuit to switch conduction/nonconduction of a diode bridge conducted in two-way to eliminate the need for a switch with mechanical structure. CONSTITUTION:When a switch 11 is closed, an output current of a constant current circuit CS1 flows to a GND and transistors (TRs) Q1-Q5 are turned off. Thus, no current flows TRs Q11, Q12 and the diode bridge 3 is nonconductive. Then both ends of a resistor R1 forming the time constant is not short-circuited. When the switch 11 is switched in the opening state, an output current of the constant current circuit CS1 flows the TR Q1 and the TRs Q2-Q5 are turned on. Thus, the bridge circuit 3 is conducted and both ends of the resistor R1 is short-circuited. The conduction/nonconduction of the diode bridge is controlled by one switch in this way and circuit integration is also attained easily.

5. 发明专利

JPS61269519A TWO-WAY SWITCH CIRCUIT 失效
公开(公告)号：JPS61269519A
公开(公告)日：1986-11-28
申请号：JP11046685
申请日：1985-05-24
申请人： HITACHI MICROCUMPUTER ENG , HITACHI LTD
发明人： ICHIKAWA YOSHIHISA , KURIHARA TERUMI , SATO TETSUO
IPC分类号： G11B5/027 , H03K17/76
摘要： PURPOSE:To decrease generation of distortion at signal transmission by providing a diode bridge composing of a bipolar transistor (TR) and a switch circuit so as to incorporate them with other electronic circuit for circuit integration. CONSTITUTION:Diode bridges 1, 2 composing of TRs Q1-Q4, Q1'-Q4' of diode connection are provided to the two-way switch circuit and a control circuit 3 controls the bridges 1, 2 at recording. A voice signal from a microphone MIC is fed to the bridge 1 via amplifiers 4, 5 while being converted into a current (i) and an output current i' from the bridge 1 is fed to a recording/ reproducing head 6. Further, the current (i) from the head 6 is fed to the bridge 2 at signal reproduction and the output current i' from the bridge 2 is fed to a speaker SP via amplifiers 11, 12. Then the bridges 1, 2 and the control circuit 3 are incorporated in the IC circuit together with other amplifiers 4, 5, 11, 12 to decrease generation of distortion at signal transmission.

6. 发明专利

JPS61241668A SIGNAL PROCESSING CIRCUIT 失效
公开(公告)号：JPS61241668A
公开(公告)日：1986-10-27
申请号：JP8248985
申请日：1985-04-19
申请人： HITACHI MICROCUMPUTER ENG , HITACHI LTD
发明人： TSUCHIYA MITSUNORI , SATO TETSUO
IPC分类号： H03G3/30 , G01R19/165 , G01R19/22 , H03D1/00 , H03D1/18
摘要： PURPOSE:To obtain detection output having good reduced voltage characteristic by providing a diode that becomes a level shifter and a transistor (Tr) that detects variation of voltage drop of a load. CONSTITUTION:A diode D1 for level shifter is provided in a current path of a current mirror circuit by TR Q1, Q2. When an input signal Vin is supplied, reference current I1 flows through Tr Q1 and diode D1 and output current I2 flows in Tr TR Q2, Q4 and a resistance RL. When a power source VCC is at a specified level, TR Q3 becomes off and output voltage is not obtained from TR Q3 and waveform distortion does not appear in detection output V obtained as voltage drop of the resistance RL. When the power source VCC becomes low, distortion is generated in output VA and becomes the state of saturation as amplitude corresponding to reduced voltage is not formed. However, TR Q3 becomes the state of on and output voltage VB corresponding to saturated part of output VA appears in the collector. By adding 2 output VA and VB through amplifiers 1, 3, an output signal Vout in which saturated part is corrected is obtained.

7. 发明专利

JPH1091467A MULTIPLEX SYSTEM COMPUTER AND ITS BACKUP METHOD 失效
公开(公告)号：JPH1091467A
公开(公告)日：1998-04-10
申请号：JP26788296
申请日：1996-09-17
申请人： HITACHI LTD , HITACHI PROCESS COMPUTER ENG
发明人： KANAZAWA TAMOTSU , SUZUKI KATSUO , HORI HIROYUKI , TOMOBE MASARU , SATO TETSUO
IPC分类号： G06F11/20 , G06F11/30
摘要： PROBLEM TO BE SOLVED: To provide a multiplex system computer, which can execute backup without deteriorating a working rate. SOLUTION: The priority of jobs executed in respective computers is set. A constitution control part 13 suitably sends a message 104 showing the states of the respective jobs (or AP job parts 115 executing them) on the computer to the other computer. The computer receiving an existence report message judges whether the backup of the job being the originating source of the message 104 is required or not based on the content of the message 104. When backup is required, the priority of the job which requires backup is compared with the priority of the job allocated to an AP job 115 which one oneself has. When the priority of the job which requires backup is higher, backup is executed by the self AP job part 115.

8. 发明专利

JPH1065456A RF POWER AMPLIFIER CIRCUIT AND MOBILE COMMUNICATION TERMINAL EQUIPMENT 失效
公开(公告)号：JPH1065456A
公开(公告)日：1998-03-06
申请号：JP21712596
申请日：1996-08-19
申请人： HITACHI LTD
发明人： SATO TETSUO , HASE HIDEKAZU , TANIMOTO TAKUMA
IPC分类号： H03G3/30 , H03F3/193 , H03F3/213 , H03F3/24 , H04B1/04
摘要： PROBLEM TO BE SOLVED: To attain RF power amplification in a stable and efficient state under a single power supply without troublesome and hairbreadth adjustment such as trimming by providing an output voltage of a comparison amplifier circuit forming a DC feedback circuit to a gate of a power amplifier FET as a bias voltage. SOLUTION: An output voltage Vo of a comparison amplifier circuit 15 from a bias generating circuit 14 is given to enhancement GaAs FETs J1, J2 forming respectively a pre-stage 12 and a final stage 11 of an RF power amplifier circuit 10 as a gate bias voltage and the FETs J1, J2 amplify power of a radio signal converted into a prescribed transmission frequency at a frequency conversion circuit 41 into a prescribed level. The output voltage Vo of the comparison amplifier circuit 15 of the bias generating circuit 14 is given to a gate of a dummy FETJx as a bias voltage to form a DC negative feedback circuit 16.

9. 发明专利

JPH106121A CUTTING TOOL FOR MACHINING END FACE 失效
公开(公告)号：JPH106121A
公开(公告)日：1998-01-13
申请号：JP15951696
申请日：1996-06-20
申请人： HITACHI LTD
发明人： SATO TETSUO , ESUMI MASAKUNI
IPC分类号： B23C5/02
摘要： PROBLEM TO BE SOLVED: To improve disposal of lubrication oil and chips in an end face cutting work and to increase a cut depth during in cutting. SOLUTION: A tool body 2 for machining an end face is mounted on the chuck 1 of a machine tool and simultaneously with rotation of the tool body 2, lubrication oil 7 is fed through the lubrication oil feed port 5 of a machine tool. The lubrication oil 7 flows through a lubrication oil passage 4 and flies out through a spit hole 8 and fed directly to a cutting edge 3. Through the rotation and spraying of the lubrication oil 7, the cutting edge 3 fixed at a cutting edge fixing pin 6 is opened and effects cutting. Chips 9 produced in this case are completely discharged through a chip discharge port 10, formed in the under surface of the tool body 2, togetherwith the lubrication oil 7.

10. 发明专利

JPH09265306A PROCESS CONTROLLER AND DETECTION METHOD FOR INOPERATIVE CONTROL CIRCUIT 失效
公开(公告)号：JPH09265306A
公开(公告)日：1997-10-07
申请号：JP7645996
申请日：1996-03-29
申请人： HITACHI LTD
发明人： ABE HISANORI , SATO TETSUO
IPC分类号： G05B19/05 , G05B19/048 , G05B23/02
摘要： PROBLEM TO BE SOLVED: To secure the safety of a plant operation by providing the information of a control circuit not performing an operation even once. SOLUTION: This process controller is provided with a PI/O 4 for inputting and outputting data between a plant 5, a programmable controller(PC) 1 for outputting the arithmetic result of a control program corresponding to input data as output data and a display means 2 for displaying the input data and the arithmetic result on a screen. A compiler 11 mounts the control program for which a storage processing 100 is added to the respective control circuits sectioned by braching points/merging points on a ladder diagram to a process control part 12. Every time of the execution of the respective control circuits in the control program, the storage processing 100 compares the value of this time of the arithmetic result with the value of a previous time, and in the case that it is changed, accumulates the number of times of change and stores it in a table 101. A retrieval processing 102 retrieves the table 101, detects the inoperative control circuit whose number of times of the change is 0 or equal to or less than a threshold value and displays it at the display means 2.

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