专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明专利

JPS6449104A MAGNETIC RECORD OUTPUT CIRCUIT 失效
公开(公告)号：JPS6449104A
公开(公告)日：1989-02-23
申请号：JP20501487
申请日：1987-08-20
申请人： PIONEER ELECTRONIC CORP , HITACHI LTD
发明人： INOHANA HARUYUKI , SAKAMOTO SHUNICHIRO , TAKADA HIDEAKI
IPC分类号： G11B5/09
摘要： PURPOSE:To prevent the generation of spike noise due to the switching of recording and reproducing and to prevent the mixing of power supply noise at the time of reproducing by connecting an impedance circuit between a recording output transistor (TR) and a power supply. CONSTITUTION:The resisting impedance circuit 4 is connected between the collector of the recording output TR 2 and the power supply +B. On the other hand, one end of a primary coil L1 of a rotary transformer 1 whose other end is connected to the earth is connected to a node between the TR 2 and the circuit 4 through a coupling capacitor C1 and the input of a reproducing preamplifier 3 is connected to one end of the coil L1 through a coupling capacitor C2. Since bias current flowing into the TR 2 is allowed to flow into the circuit 4, spike noise is not generated even when current flowing into the recording output TR is suddenly changed by the switching of recording and reproducing. Since the circuit 4 is inserted between the power supply +B and the coil L1 at the time of reproducing, no power supply noise is mixed into a reproduced signal.

2. 发明专利

JPS6443864A REPRODUCING DEVICE 失效
公开(公告)号：JPS6443864A
公开(公告)日：1989-02-16
申请号：JP19987287
申请日：1987-08-12
申请人： HITACHI LTD , PIONEER ELECTRONIC CORP
发明人： TAKADA HIDEAKI , INOHANA HARUYUKI
IPC分类号： G11B20/10
摘要： PURPOSE:To obtain a regenerative amplifier without varying its gain due to temp. by providing a stabilized voltage output with a stabilized electric power source having temp. characteristics and affording it to a reproducing device for its electric power source. CONSTITUTION:An input signal is supplied from a terminal T3 to the base of a transistor TRQ5. The collector of a TRQ4 is connected with the base of a TRQ5, while an output signal is outputted from the emitter of a TRQ7 to a terminal T4. The gain A of this regenerative amplifier is denoted by an equation 1, where (k) is Boltzmann's constant, and T is absolute temp., and then (q) is unit electric charge, while V1 refers to an output voltage of the stabilized electric power source V1 and V stands for a base voltage of the TRQ5. Based on this, the output voltage of the electric power source V1 will have a temp. coefft. of -8mV/ deg.C. For this, the voltages V1 and V as denoted by the equation I are offset against each other, so that no gain fluctuation due to temp. will take place.

3. 发明专利

JPS6449305A WIDE BAND AMPLIFIER 失效
公开(公告)号：JPS6449305A
公开(公告)日：1989-02-23
申请号：JP20501287
申请日：1987-08-20
申请人： PIONEER ELECTRONIC CORP , HITACHI LTD
发明人： INOHANA HARUYUKI , TAKADA HIDEAKI
IPC分类号： H03F3/343 , H03F3/34
摘要： PURPOSE:To obtain a dynamic range as large as possible in an applied power supply voltage, by using an NPN transistor whose high frequency performance is excellent, for a signal path. CONSTITUTION:A differential amplifier 11 consisting of a pair of NPN transistors Q11, Q12 converts a variation of an input voltage impressed between a base and a base of the transistors Q11, Q12 being an input IN, to a current variation. A current mirror circuit 15 consisting of transistors Q21, Q22 and resistances R16, R17 brings a signal current and a prescribed DC bias current to a mirror output. In such a way, the output part of the amplifier is constituted by stacking up only one stage of NPN transistor of the current mirror circuit 15, therefore, in an applied power supply voltege VCC, the dynamic range becomes as large as possible.

4. 发明专利

JPS6449176A PLL CIRCUIT 失效
公开(公告)号：JPS6449176A
公开(公告)日：1989-02-23
申请号：JP20501587
申请日：1987-08-20
申请人： PIONEER ELECTRONIC CORP , HITACHI LTD
发明人： INOHANA HARUYUKI , SAKAMOTO SHUNICHIRO , TAKADA HIDEAKI
IPC分类号： H04L7/033 , G11B20/14 , H03L7/08 , H03L7/087 , H03L7/113
摘要： PURPOSE:To expand a capture range by controlling a voltage control oscillator also by the output of a frequency comparator in addition to the output of a phase comparator. CONSTITUTION:When a frequency difference between an 8/10 signal inputted from a terminal 1 as a reference input and a demodulating clock as a variable input is stored in the 1st capture range, a phase comparator 3 compares both the inputs and outputs an error signal having size and polarity corresponding to the shear, quantity and directions of the phases. When said frequency difference is stored in the 2nd capture range wider than the 1st range, a frequency comparator 4 compares both the values and outputs the shear or the like of frequency as a signal. High frequency components are respectively removed from signals obtained from comparators 3, 4 by the 1st and 2nd LPFs 5, 6, inputted to an adder 7, controlled by the oscillation frequency of a voltage control oscillator 8 and outputted from a terminal 2 as a demodulated clock.

5. 发明专利

JPS6444123A PLL CIRCUIT 失效
公开(公告)号：JPS6444123A
公开(公告)日：1989-02-16
申请号：JP19987587
申请日：1987-08-12
申请人： HITACHI LTD , PIONEER ELECTRONIC CORP
发明人： TAKADA HIDEAKI , ISO YOSHIMI , INOHANA HARUYUKI , TSUCHIDA MASAMI
IPC分类号： H03L7/10
摘要： PURPOSE:To obtain a clock signal synchronously with an input signal stably by providing a reset circuit to a voltage controlled oscillator, and resetting the oscillator when the input signal and the output clock signal of the oscillator are not synchronized. CONSTITUTION:An input signal supplied to an input terminal 1 and an output clock signal of a voltage controlled oscillator VCO 4 are fed to a phase comparator 2, and the output signal of the phase comparator 2 is fed to the VCO 4 via a low pass filter 3 to apply PLL operation. A reset circuit is provided to the VCO 4 and when the input signal and the clock signal are not synchronized, the VCO 4 is reset by a reset pulse generated from a reset pulse generating circuit 5. Thus, even when the repetitive period of the output waveform of the comparator 2 is smaller than the time constant of the filter 3, the PLL does not reach a pseudo stable state and the clock signal synchronously with the input signal is obtained stably.

6. 发明专利

JPS6455706A MAGNETIC RECORDING OUTPUT CIRCUIT 失效
公开(公告)号：JPS6455706A
公开(公告)日：1989-03-02
申请号：JP21014387
申请日：1987-08-26
申请人： PIONEER ELECTRONIC CORP , HITACHI LTD
发明人： INOHANA HARUYUKI , ARAI TAKAO , TAKADA HIDEAKI
IPC分类号： G11B5/09
摘要： PURPOSE:To prevent the generating of spike noise due to the switching of recording and reproducing without causing a DC current to flow at a primary coil of a rotary transformer by connecting a circuit which becomes the impedance of the resistance which is small at the time of recording and large at the time of reproducing, between an output transistor (Tr) for recording and a power source. CONSTITUTION:To the control electrode of an output Tr2 of a magnetic recording output circuit, a recording signal superimposed to a bias voltage is impressed, and the Tr2 and an impedance circuit 4 are serially connected between a power source +B and a ground potential. To the connecting part of the Tr2 and the circuit 4, one edge of the primary coil L1 of a rotary transformer 1 connected to connect other edge to a ground potential and the input of a reproducing pre-amplifier 3 are connected through a coupling capacitor C1. Without causing a direct current bias current to flow at the primary coil L1 of the rotary transformer 1, the generation of the spike noise is prevented by the switching of the recording and reproducing.

7. 发明专利

JPS6449309A REPRODUCING WAVEFORM EQUALIZING CIRCUIT 失效
公开(公告)号：JPS6449309A
公开(公告)日：1989-02-23
申请号：JP20501187
申请日：1987-08-20
申请人： PIONEER ELECTRONIC CORP , HITACHI LTD
发明人： INOHANA HARUYUKI , TAKAOKA SABURO , TAKADA HIDEAKI
IPC分类号： H03H11/04 , G11B5/035 , G11B20/10 , H04B3/04
摘要： PURPOSE:To obtain a further optimized waveform equalizing characteristic, in accordance with a transfer characteristic of a recording and reproducing system, by constituting the titled circuit so that four angular frequencies can be set independently, respectively, as an element for determining the waveform equalizing characteristic. CONSTITUTION:The first network 14 is inserted between an input terminal 11 and an inversion input of a differential amplifier 13, and has a transfer function H1(s). The second network 15 is inserted between the input terminal 11 and a forward turn input of the differential amplifier 13, and has a transfer function H2(s). For instance, when sigma1-sigma4 of predicted frequency-gain characteristics derived by a reproducing waveform equalizing circuit are determined as sigma1=2pi.1MHz, sigma2=2pi.5MHz, sigma3=2pi.100kHz, and '4=2pi.10MHz, and also, the gain in a low frequency area is OdB, a constant of constituting element of the network 14 and the network 15 is set by a calculation. In such a way, an equalizing characteristic corresponding to a transfer characteristic of an actual recording and reproducing system can be optimized. In the expression (6), K and (k) denote constants, and angular frequencies a1-a4 are in a relation of (7)sigma3

8. 发明专利

JPS6444517A CONSTANT CURRENT SOURCE CIRCUIT 失效
公开(公告)号：JPS6444517A
公开(公告)日：1989-02-16
申请号：JP19984887
申请日：1987-08-12
申请人： HITACHI LTD , PIONEER ELECTRONIC CORP
发明人： TAKADA HIDEAKI , ISO YOSHIMI , INOHANA HARUYUKI , TSUCHIDA MASAMI
IPC分类号： G05F3/26
摘要： PURPOSE:To stably generate a constant current without generating oscillation by reducing cut-off frequency in the frequency characteristics of a base current compensating circuit in a current mirror circuit. CONSTITUTION:A constant current source 5 and a base current compensating circuit 9 are connected to the current mirror circuit consisting of transistors (TRs) 1, 2 and feedback loop is constituted of the base and collector of the TR1 and the base and emitter of a TR 3 in the circuit 9 and a feedback loop is constituted of the base and collector of the TR 1 and the base and emitter of a TR 3 in the circuit 9. Since a resistor 8 and a capacitor 7 are connected to the TR 3, the cut-off frequency of frequency characteristics of the circuit 9 is sufficiently reduced as compared with the cut-off frequency of current amplification of the TR 1. Consequently, the open loop characteristics of the feedback look can be set up to a value less than gain 1 in the frequency with 360 deg. phase delay. Consequently, a constant current can be stably generated without generating oscillation.

9. 发明专利

JPS6444516A POWER SUPPLY CIRCUIT 失效
公开(公告)号：JPS6444516A
公开(公告)日：1989-02-16
申请号：JP19984787
申请日：1987-08-12
申请人： HITACHI LTD , PIONEER ELECTRONIC CORP
发明人： TAKADA HIDEAKI , ISO YOSHIMI , INOHANA HARUYUKI
IPC分类号： G05F3/30 , G05F3/26
摘要： PURPOSE:To reduce the influence of variation in a supply voltage to an output voltage by removing variation due to the supply voltage in voltages impressed between the collectors and emitters of respective transistors (TRs) constituting a current regulating circuit in a power supply circuit for converting generated current into voltage. CONSTITUTION:Transistors (TRs) 1, 2 constitute a current mirror and two almost equal currents generated from these TRs 1, 2 are supplied to TRs 3, 4 through TRs 5-8 and converted into an output voltage by an external circuit. At that time, voltages impressed between the collectors and emitters of the TRs 1-4 are not easily influenced by the variation of the supply voltage because of the actions of the Trs 5-8. Thereby, said current is not easily influenced by the variation of the supply voltage and the influence due to the variation of the supply voltage upon the output voltage.

10. 发明专利

JPS6443866A REPRODUCING DEVICE 失效
公开(公告)号：JPS6443866A
公开(公告)日：1989-02-16
申请号：JP19987487
申请日：1987-08-12
申请人： HITACHI LTD , PIONEER ELECTRONIC CORP
发明人： TAKADA HIDEAKI , INOHANA HARUYUKI
IPC分类号： G11B20/10 , G11B19/02 , G11B20/00
摘要： PURPOSE:To shorten a settling time of a regenerative amplifier by providing a switch between a resistor and a capacitor and giving a bias to the capacitor so as to approximately equalize a voltage between both ends of the capacitor at the time of recording to that voltage at the time of reproducing. CONSTITUTION:At the time of reproducing, a switch S1 is closed, and moreover a switch S2 is connected to the side of a resistor R6. At the time of recording, the switch S1 is opened, and moreover the switch S2 is connected to the side of a resistor R7. In this case, since an emitter electric potential of a transistor Q7 is raised above the electric potential at the time of reproducing, but an approximately same bias as that at the time of reproducing is given from a voltage source V1 via the resistor R7 and the switch S2 to the capacitor C1, a charge to the capacitor C1 can be reduced.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式