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1. 发明专利

JPH10295073A APPARATUS AND METHOD FOR PHASE DETECTION 失效
公开(公告)号：JPH10295073A
公开(公告)日：1998-11-04
申请号：JP10002997
申请日：1997-04-17
申请人： HITACHI LTD
发明人： NISHIOKA ATSUSHI , WADA AKIHISA , MIYAHARA YOJIRO
IPC分类号： G01R23/10 , G01R25/08 , H02M1/08 , H03L7/08
摘要： PROBLEM TO BE SOLVED: To cope with sudden changes in the phase of an input signal, to deal with sudden changes in its amplitude and to deal with changes in frequency in a single-phase PLL circuit by a method, wherein a frequency initial value is corrected by a counted value which is found by a frequency initial-value circuit as a separate circuit from the detecting loop of the single-phase PLL circuit. SOLUTION: A frequency initial-value circuit is constituted of a filter 9, a one-cycle counting circuit 7 and a computing unit 8. In a phase-difference detection circuit 1, the phase difference Δθ between a phase detection value θ and an input signal is found on the basis of three signals, i.e., the input signal, an output signal of a multiplier 5 and a second internal reference signal. A frequency detection circuit 2 is constituted of a circuit used to amplify the phase difference Δθ and of a circuit which adds a frequency initial-value found by the frequency initial-value circuit and finds a frequency detection value. In a phase detection circuit 3, the frequency detection value is integrated so as to find a phase detection value θ. In an amplitude detection circuit 6, the difference between the output value of the input signal of the multiplier 5 is amplified, so as to find an amplitude detection value. By this constitution, the phase difference Δθ becomes small, and the output signal of the multiplier 5 is made to agree with the input signal.

2. 发明专利

JPH09145757A PHASE DETECTION DEVICE AND METHOD 失效
公开(公告)号：JPH09145757A
公开(公告)日：1997-06-06
申请号：JP30556795
申请日：1995-11-24
申请人： HITACHI LTD
发明人： AZUSAZAWA NOBORU , MIYAHARA YOJIRO , NEMEZAWA MASANOBU , NISHIOKA ATSUSHI
IPC分类号： G01R25/08 , G01R25/04 , H02H7/09 , H02M1/08 , H03L7/085
摘要： PROBLEM TO BE SOLVED: To continue operation when the power supply of, for example, a thyristor (including GTO) phase control power converter incorporating a phase detection device fails (for example, grounding, phase interruption, and three- phase unbalance) by detecting synchronization phase even if a multiple-phase AC input signal is unbalanced. SOLUTION: A first internal sinusoidal wave signal eq and a second internal sinusoidal wave signal ed which differs from the signal eq by a specific phase θ0 are generated according to a count value obtained by integrating an internal reference frequency command value 9. The signals eq and ed are inputted and one-phase AC signal eaq = Ea × sin θa out of AC input signals whose phase is to be detected is inputted, thus calculating a phase difference Δθ between the signals eqa and eq. An internal reference frequency command value 9 is corrected by a signal in response to the phase difference Δθ and the minimum phase difference Δθ is controlled to be reduced. The same synchronization phase is detected also for other phases ebq and ecq in the above AC input signal.

3. 发明专利

JPH0862616A REFLECTION TYPE LIQUID CRYSTAL ELEMENT AND PROJECTION TYPE DISPLAY DEVICE USING THIS ELEMENT 失效
公开(公告)号：JPH0862616A
公开(公告)日：1996-03-08
申请号：JP19925094
申请日：1994-08-24
申请人： HITACHI LTD , HITACHI PROCESS COMPUTER ENG
发明人： NAGATA TETSUYA , SATO HIDEO , HOSHINO MINORU , YAMAMOTO TSUNENORI , HIROTA SHOICHI , MIYAHARA YOJIRO , KATSUYAMA ICHIRO
IPC分类号： G02F1/1333 , G02F1/1335 , G02F1/1343 , G02F1/1345 , H04N5/74
摘要： PURPOSE: To reduce the size of a silicon chip which is a reflection substrate, etc., and to improve the yield at the time of production by having connecting terminals to external circuits on a surface opposite to a surface having the active elements and reflection pixel electrodes of a reflection substrate. CONSTITUTION: This reflection type liquid crystal element consists of a transparent substrate 1 having transparent electrodes 2, liquid crystals 3, a sealant 11 and the reflection substrate 7 and is provided with the connecting terminal parts 8 to the external circuits on the surface opposite to the surface provided with the reflection pixel electrodes 4 from wiring parts 10 for power source supply, control signals, etc., via through-holes 9 on the reflection substrate 7 formed with the active elements 5 and the reflection pixel electrodes 4 on the silicon substrate 6, etc. Then, the connecting terminal parts 8 are arranged without being restricted by the pixel parts, peripheral circuits, etc., and since wire bonding is executable on the surface opposite to a surface facing dichroic prisms, the reliability at the time of packaging is improved. The positions of wire bonding pads are no longer restricted to the outer side of the positions of the reflection pixel electrodes 4 and, therefore, the size reduction of the silicon substrate 6 is possible.

4. 发明专利

JPS6484157A METHOD AND DEVICE FOR CURRENT DETECTION 失效
公开(公告)号：JPS6484157A
公开(公告)日：1989-03-29
申请号：JP24347887
申请日：1987-09-28
申请人： HITACHI LTD
发明人： MIYAHARA YOJIRO , AZUSAZAWA NOBORU , NEMEZAWA MASANOBU
IPC分类号： G01R19/00 , G01R19/252 , H02M7/48
摘要： PURPOSE:To reduce the size of the device and lessen the influence of a pulsating component, and to enable high-accuracy current detection up to a low current area by converting a current into pulses proportional to its current value and counting the pulses, and then generating a pulse counted value. CONSTITUTION:When such a high current that the pulses is inputted at, for example, a sampling period Tc is supplied, a multiplied pulse signal is counted by a reversible counter 22 and the counted values M(i-1) and M(i) are stored in a register A23 every time a pulse is inputted. A counter 25, on the other hand, counts a reference clock and T(i-1) and T(I) are stored as time counted values in a register A26 every time a multiplied pulse is inputted. Then the contents of the registers A23 and A26 are stored in registers B24 and B27 and then read out at the time of sampling S(i-1) and S(i). The read current counted value M and time counted value T are therefore values at the time of pulse signal input and irrelevant to the sampling period Tss. The current value Im is therefore calculated with hgh accuracy from IM=KXM(i)-M(i-1)/T(i)-T (i-1) (T: constant).

5. 发明专利

JPS63174570A INVERTER CONTROLLER 失效
公开(公告)号：JPS63174570A
公开(公告)日：1988-07-19
申请号：JP322587
申请日：1987-01-12
申请人： HITACHI LTD
发明人： MIYAHARA YOJIRO , AZUSAZAWA NOBORU
IPC分类号： H02M7/48
摘要： PURPOSE:To prevent an element from being destroyed at the time of starting/ stopping, by setting an only self-extinguishing element on the positive side or the negative side, in an ignition state or the like, prior to suppressing a gate at the time of stopping an inverter, regardless of the ON/OFF of gate pulse. CONSTITUTION:An inverter controller is composed of a gate pulse generation circuit 6, an output circuit 9, and a minimum pulse width producing circuit 30. The producing circuit 30 is composed of an OR circuit 7, a forward/reverse short-circuiting-proof circuit 8, a clock oscillator 10, and a delay circuit 11. In this case, at the time of stopping an inverter, when a gate is suppressed immediately after gate pulse is turned ON, then the gate pulse width of its element gets smaller. At the time of starting, the gate pulse of the positive or negative element is forcibly turned ON, and the suppression is released, and a fixed time later, the forcible turn-on of the gate pulse is stopped, and an ignition state with normal gate pulse is kept. As a result, the element or the like can be prevented from being destroyed.

6. 发明专利

JPH09200789A REFLECTION TYPE PROJECTION LIQUID CRYSTAL DISPLAY DEVICE 失效
公开(公告)号：JPH09200789A
公开(公告)日：1997-07-31
申请号：JP709496
申请日：1996-01-19
申请人： HITACHI LTD , HITACHI PROCESS COMPUTER ENG , NORITA KOGAKU KK
发明人： MIYAHARA YOJIRO , KATSUYAMA ICHIRO , NAGATA TETSUYA , MATSUOKA KAZUO
IPC分类号： G02F1/13 , G02F1/1335 , G03B21/00 , H04N5/74 , H04N9/31
摘要： PROBLEM TO BE SOLVED: To provide a reflection type projection liquid crystal display device with which efficiency for utilizing the quantity of light can be improved when splitting/synthesizing beams on a dichroic mirror or a dichroic prism. SOLUTION: After projection light is made incident from a direction vertical to the optical axis of a projection lens and a plane including the normal of dielectric multi-layer film provided for 1st and 2nd dichroic mirrors 6 and 7 or 1st and 2nd dichroic prisms, this light is reflected toward the dichroic mirrors 6 and 7 or the dichroic prisms on a full reflection mirror 4. Thus, efficiency for utilizing the quantity of light for splitting/synthesizing beams on the dichroic mirrors 6 and 7 or the dichroic prisms, on which the dielectric multi-layer film is deposited, can be improved.

7. 发明专利

JPH06317615A ELECTRIC CURRENT DETECTING METHOD AND ITS DEVICE 失效
公开(公告)号：JPH06317615A
公开(公告)日：1994-11-15
申请号：JP31050293
申请日：1993-12-10
申请人： HITACHI LTD
发明人： MIYAHARA YOJIRO , AZUSAZAWA NOBORU , NEMEZAWA MASANOBU
IPC分类号： G01R19/252 , G01R19/00 , G05F1/10 , H02M7/48
摘要： PURPOSE:To provide a current detecting method being less in the influence of a pulsating component resulting from PWM control. CONSTITUTION:A current detecting device has a current detector to convert a load current into a voltage signal; a V/F converter 12 to convert the voltage signal into a pulse line having the number of pulses proportional to the absolute value of the instantaneous value of the voltage signal; a reversible counter to reversibly count the number of pulses to the positive and negative of the instantaneous value of the voltage signal; and a central processor unit (CPU). The central processor unit samples a counted value at timing synchronizing with a carrier wave signal, and obtains a difference between the sampled counted value and the counted value at the time of previous sampling. The detected value of the load current is computed on the counted value divided by the time difference of the sampling.

8. 发明专利

JPH05341253A 失效
公开(公告)号：JPH05341253A
公开(公告)日：1993-12-24
申请号：JP14935092
申请日：1992-06-09
申请人： HITACHI LTD , HITACHI PROCESS COMPUTER ENG
发明人： HASHIMOTO TADAHIKO , MIYAHARA YOJIRO , KATSUYAMA ICHIRO
IPC分类号： G02F1/13 , G02F1/1347 , G03B33/12
摘要： PURPOSE:To reduce the astigmatism of a projection ray and to obtain a sharp color projection image without out-of-focus by making the inclination angles of respective dichroic mirrors a specified value or be low. CONSTITUTION:A projection beam outgoing from a light source 1 is reflected by a total reflection mirror 3 in a projection lens 2 and goes toward a first dichroic mirror 4. The inclination angle theta between the normal of the first dichroic mirror 4 and the projection beam is made

9. 发明专利

JPS63238464A SPEED SIGNAL DETECTOR 失效
公开(公告)号：JPS63238464A
公开(公告)日：1988-10-04
申请号：JP7231087
申请日：1987-03-26
申请人： HITACHI LTD
发明人： KAMIYAMA KENZO , MIYAHARA YOJIRO , AZUSAZAWA NOBORU , MATSUDA TOSHIHIKO
IPC分类号： G01P3/42 , G01P3/44
摘要： PURPOSE:To enable the reliable speed data of a rotor to be transmitted by converting analog signals with a frequency proportional to the number of revolutions of the rotor to digital signals. CONSTITUTION:Analog signal generating means outputs analog signals with a frequency proportional to the number of revolutions of a rotor. The analog signals are converted to digital signals by waveform shaping means. The number of pulses of the digital signals is counted by counting means. From a value counted within a speed measuring time in the counted values of the counting means, a phase angle corresponding to above-mentioned value is detected by a first phase angle detecting means. The phase angles of the analog signals at speed measurement starting time and ending time are detected by a second phase angle detecting means. From a difference between those phase angles, a phase angle corresponding to the speed measuring time is calculated by phase angle calculating means. From the ratio of the phase angle calculated by the phase angle calculating means to the speed measuring time, a digital speed signal is produced.

10. 发明专利

JPS6231234A OPTICAL REMOTE INPUT/OUTPUT DEVICE 失效
公开(公告)号：JPS6231234A
公开(公告)日：1987-02-10
申请号：JP16985585
申请日：1985-08-02
申请人： HITACHI LTD
发明人： MIYAHARA YOJIRO , NEMEZAWA MASANOBU , AZUSAWA NOBORU , FUNAKOSHI SHUJI
IPC分类号： H04B10/07 , H04B10/00 , H04B10/038 , H04B10/077 , H04B10/278 , H04B10/29 , H04L12/42 , H04L12/437
摘要： PURPOSE:To diagnose the abnormal contents and abnormal points promptly by providing an RAS data in a part of the transmission data outputted from a process controller to each terminal and not updating the RAS data only in the case of abnormality. CONSTITUTION:As shown in a signal A, an abnormal signal '1' is set beforehand in a part of the RAS data and transmitted from a serial transmission equipment 12. Since optical remote input/output devices 20a-20b are normal, the transmission data B and C are rewritten from '1' to '0' with respect to the RAS data of a self data slot. But if there is disconnection at a point M, the optical remote input/output device 20c diagnoses it as an abnormal reception. This device does not rewrite a circuit abnormal signal, but rewrites an MPU abnormal signal '1' to an MPU normal signal '0', and transmits it to the next stage. Therefore, in the received data into a serial transmission equipment 13, as shown in a signal E, only the 3rd RAS data is not '0', whereby the circuit between the devices 20b and 20c can be diagnosed as abnormal.

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