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    • 2. 发明专利
    • LIQUID CRYSTAL DISPLAY DEVICE
    • JP2000292765A
    • 2000-10-20
    • JP9751199
    • 1999-04-05
    • HITACHI LTDHITACHI DEVICE ENG
    • CHIBA SHINSAKUKONDO YASUAKI
    • G09G3/18G02F1/133G09G3/20G09G3/36
    • PROBLEM TO BE SOLVED: To reduce the power consumption by making a driving voltage supply means incorporate an output stage circuit which outputs a current only in the flowout direction from the driving voltage supply means and an output stage circuit which outputs a current only in the inflow direction. SOLUTION: An operational amplifier O'P2 in place of a conventional operational amplifier and an npn type transistor TR1 which has its base connected to the output terminal of the operational amplifier O'P2 and its emitter connected to the inverted input terminal of the operational amplifier O'P2 through a resistance are used. When the voltage of a load circuit (capacitor Cs) is lower than a driving voltage Vsh, the npn type transistor TR1 supplies a current Ish to the capacitor Cs to charge the capacitor Cs so that the voltage of the capacitor Cs approximates the Vsh. If the voltage of the capacitor Cs varies and the voltage of the capacitor Cs is higher than the driving voltage Vsh, the npn type transistor TR1 turns off. Consequently, no unnecessary current flows and the electric power is not wasted.
    • 3. 发明专利
    • LIQUID CRYSTAL DISPLAY DEVICE
    • JPH075848A
    • 1995-01-10
    • JP16748093
    • 1993-06-14
    • HITACHI LTD
    • CHIBA SHINSAKU
    • G02F1/133G09G3/36
    • PURPOSE:To simultaneously change output of a scanning driver and a data driver, to reduce power consumption and to improve quality of display by setting signal delay of a scanning driver side and a data driver side equally basing on the clock pulse as a reference. CONSTITUTION:An alternating signal M is inputted to a latch fetches circuit FF through an input buffer IB. This latch circuit FF the alternating signal M synchronizing with a clock pulse CL and transmits an alternating signal M' to a level shifter. And, both a scanning driver and a data driver are provided with an input buffer section, and fetch the same alternating signal M by the same clock pulse CL. Therefore, the alternating signal M' supplied to the level shifter in the scanning driver and the data driver is varied with same timing. Consequently, variation timing of driving voltage supplied to a scanning line electrode and a signal line electrode are made almost the same, and high voltage due to output time difference is not applied to liquid crystal.
    • 4. 发明专利
    • MEMORY DEVICE
    • JPS63197214A
    • 1988-08-16
    • JP2824287
    • 1987-02-12
    • HITACHI LTD
    • CHIBA SHINSAKU
    • G06F3/06G11C11/14G11C19/08
    • PURPOSE:To ensure the complete compalitility between a memory and a floppy disk memory device by receiving the track shift signal from a floppy disk control device to count the up/down frequencies of the pulse designating the track shift frequency according to the track shift direction for detection of a designated track number. CONSTITUTION:A floppy disk control device FDC transmits a step signal STEP and a step direction signal DIR with a seeking instruction for track shift excluding the accesses on the same track. An interruption signal IRQ is produced via a peripheral interface adaptor PIA and synchronously with the front or back edge of the signal STEP. A microprocessor MPU identifies the level of the signal DIR in an interruption process and performs the addition or subtraction equivalent to a single step against the stored track number. The interruption processes are carried out for each signal STEP and therefore the addition or subtraction is performed in response to the number of signals STEP. Thus the track number to receive an access can be decided.
    • 5. 发明专利
    • MAGNETIC BUBBLE MEMORY DEVICE
    • JPS63197086A
    • 1988-08-15
    • JP2824187
    • 1987-02-12
    • HITACHI LTD
    • CHIBA SHINSAKU
    • G11C11/14G11C19/08
    • PURPOSE:To attain parallel action of plural bubble memory devices and to improve a data transfer rate by synchronizing plural bubble memory controllers, and actuating them. CONSTITUTION:Synchronization circuits SYNC1 and SYNC2 are provided in order to synchronize the bubble memory controllers BMC1-BMC4. Receiving an output signal from a level detection circuit LD which detects the entry/cut-off of a power source, the synchronization circuit SYNC2 generates a power on reset signal POR and a power down signal PD synchronizing with the clock signals of the bubble memory controllers BMC1-BMC4. Another synchronization circuit SYNC1 synchronizes the command fetching timing in the bubble memory controllers BMC1-BMC4. Thus, plural bubble memory controllers can be synchronized to actuate them, and the parallel action of plural bubble memory devices can be realized, so that the data transfer rate can be improved.
    • 6. 发明专利
    • MAGNETIC BUBBLE MEMORY DEVICE
    • JPS61210597A
    • 1986-09-18
    • JP5040885
    • 1985-03-15
    • HITACHI LTD
    • CHIBA SHINSAKU
    • G11C11/14G11C19/08
    • PURPOSE:To realize a voltage rise circuit obtainable a stable output voltage with a low cost by constituting an output voltage detecting circuit by a zener diode and a transistor and a resistance for dividing a potential. CONSTITUTION:By a voltage rise circuit comprising a frequency dividing flip flop (FF) circuit 11 having a clock signal input terminal 12 and an input terminal 13 of a power source voltage Vcc and a synchronizing FF circuit 14 and the like, an output of a diode pump circuit 15 rises and an output voltage VD of a predetermined value is obtained in an output terminal 21. When a potential dividing voltage of this output voltage VD is larger than a sum of a zener voltage of a zener diode 27 and a voltage between a base and an emitter of a transistor 28, the transistor 28 is turned on and outputs a reset input to a reset terminal of the frequency dividing FF circuit 11. Thereby, the output voltage VD becomes a constant voltage value. By enlarging the zener voltage, uneveness in the output voltage VD can be made small.
    • 7. 发明专利
    • CASSETTE-TYPE MAGNETIC BUBBLE MEMORY DEVICE
    • JPS61175991A
    • 1986-08-07
    • JP1418885
    • 1985-01-30
    • HITACHI LTD
    • CHIBA SHINSAKUFUTAMI TOSHIO
    • G11C11/14G11C19/08
    • PURPOSE:To prevent the occurrence of malfunction due to static electricity by installing a grounding means between a magnetic bubble memory device main body and a magnetic bubble memory cassette case. CONSTITUTION:Where a cassette 10 is loaded on an adapter to attain the operable state, such an electircal conductive path is formed that the case 13 of the cassette 10 passes sequentially through a contact piece 8, a cassette attaching and detaching mechanism 6, a ground pattern 4 and a ground terminal 5. Therefore, when static electricity is impressed on the case 13, its charge flows quickly through said conductive path, and is discharged to the ground of the magnetic bubble memory device main body case. This means that the static electricity impressed on the case 13 does not flow a device 11 in the cassette 10, a sense amplifier circuit 12 and the signal ground systems of integrating circuits 2 and 3 of a printed circuit board 1, and accordingly the ground potentials of the circuits 2, 3 and 12 do not fluctuate. Thus the occurrence of an abnormal current is prevented, and the distruction of memory data stored in the device 11 is prevented.
    • 10. 发明专利
    • Magnetic bubble memory controller
    • 磁性气泡记忆体控制器
    • JPS59198589A
    • 1984-11-10
    • JP6994483
    • 1983-04-22
    • Hitachi Ltd
    • YOSHIDA KAZUTOSHICHIBA SHINSAKUTAKAYANAGI HIROSHISUGIE MAMORU
    • G11C11/14G06F3/00G06F11/00G06F11/07G06F13/40
    • G06F11/073G06F3/007G06F11/0751
    • PURPOSE: To quicken the reading time of a register of a data controller by controlling an output buffer of the data controller so as to be an open drain structure at simultaneous read.
      CONSTITUTION: In case of simultaneous read of the data controller, a PREAD signal goes to an "H", resulting that an NMOS transistor (TR)12 is turned on/off depending the state of a DATA signal. That is, when the DATA signal is at the "H", the NMOS TR12 is turned on, and when an "L", the TR12 is turned off. On the other hand, in a PMOS TR13, an SREAD signal is at the "L" independently of the level of the PREAD signal and the TR13 is turned off at simultaneous reading. Thus, an OUT signal is in either OFF state depending on the content of the register at simultaneous read or ON stat of the NMOS TR12. In this state, the NMOS TR12 only is connected, and in case of the simultaneous read depending on the content of data, the NMOS TR12 is turned on or off and it is equivalent that no PMOSTR11 is provded.
      COPYRIGHT: (C)1984,JPO&Japio
    • 目的:通过控制数据控制器的输出缓冲器来加快数据控制器寄存器的读取时间,以便同时读取时是一个开漏结构。 构成:在同时读取数据控制器的情况下,PREAD信号变为“H”,导致NMOS晶体管(TR)12根据DATA信号的状态导通/截止。 也就是说,当DATA信号为“H”时,NMOS TR12导通,当“12”为“L”时,TR12被关断。 另一方面,在PMOS TR13中,SREAD信号独立于PREAD信号的电平为“L”,并且TR13在同时读取时被关断。 因此,根据NMOS TR12的同时读或ON状态下的寄存器的内容,OUT信号处于OFF状态。 在这种状态下,只有NMOS TR12被连接,并且在根据数据的内容进行同时读取的情况下,NMOS TR12导通或截止,并且等同于没有提供PMOSTR11。