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1. 发明专利

JPH09130155A SEMICONDUCTOR DEVICE 失效
公开(公告)号：JPH09130155A
公开(公告)日：1997-05-16
申请号：JP24854596
申请日：1996-08-30
申请人： KENWOOD CORP , SANKEN ELECTRIC CO LTD
发明人： OKUMA TATSUHIKO , MIYAMOTO AKIRA , SATO HACHIRO
IPC分类号： H03F1/30 , H03F3/30
摘要： PROBLEM TO BE SOLVED: To provide the semiconductor device which reduces the labor of production in the case of SEPP(single ended push pull) connecting NPN and PNP power transistors TRS together with a bias circuit and satisfactorily performs temperature compensation. SOLUTION: An ordinary diode 22 for bias is formed on the same semiconductor substrate as an NPN power TR 21 of a first semiconductor device 20, and one or plural Schottky barrier diodes 321 to 32n are formed on the same substrate as a PNP power TR 31 of a second semiconductor device 30. The sum total of voltage drops in the forward direction between bases and emitters of NPN and PNP power TRs is denoted as E, and a voltage drop V1 in the forward direction of the diode 22 is made smaller than E and is set to an arbitrary fixed value different from about E/2, and a drop voltage V in the forward direction of the whole of Schottky barrier diodes is set to a prescribed value (E-V1 ).

2. 发明专利

JPH10294623A AMPLIFIER CIRCUIT 失效
公开(公告)号：JPH10294623A
公开(公告)日：1998-11-04
申请号：JP11634697
申请日：1997-04-18
申请人： KENWOOD CORP
发明人： KANEHIRA MASARU , OKUMA TATSUHIKO
IPC分类号： H03F3/45 , H03F1/34
摘要： PROBLEM TO BE SOLVED: To provide amplification characteristic with which distortion is reduced while lowering the low cut-off frequency. SOLUTION: One terminal of input bias resistor R1 is connected to the output side of coupling capacitor C1 and the non-inverting input terminal of operational amplifier OP is connected. Inside a negative feedback circuit 3 provided between the output side and inverting input terminal of operational amplifier OP, the other terminal of input bias resistor R1 is connected to a node between a capacitor C2 , which is serially connected between the inverting input terminal of operational amplifier OP and the ground, and a 2nd resistor R3 .

3. 发明专利

JPH10290124A ELECTRONIC CIRCUIT 失效
公开(公告)号：JPH10290124A
公开(公告)日：1998-10-27
申请号：JP11007997
申请日：1997-04-14
申请人： KENWOOD CORP
发明人： SEKIZAWA NORIYUKI , OKUMA TATSUHIKO
IPC分类号： H03F3/45 , H03F1/08
摘要： PROBLEM TO BE SOLVED: To provide the electronic circuit that suppresses fluctuation due to a frequency of a signal current resulting from an unknown impedance of a line through the configuration of the electronic circuit. SOLUTION: The electronic circuit is provided with a noninverting amplifier circuit, which has operational amplifier A1 that amplifies an input voltage and a voltage division circuit consisting of resistors R1, R2 that divides an output voltage of the operational amplifier A1, and where one terminal of the resistor R2 is connected to an output terminal of the operational amplifier A1, a common connecting point of the resistors R1, R2 is connected to an inverting input terminal of the operational amplifier A1, and a divided voltage applied to the resistor R2 is fed to an inverting input terminal of the operational amplifier A1, with an inverting amplifier that amplifies a voltage at the inverting input terminal of the operational amplifier A1, and with a receiver R3 that is connected between an output terminal of the inverting amplifier A2 and a terminal of the resistor R1 opposite to the common connecting terminal. Then a resistance of the resistor R3 is selected to be a multiple of a gain of the inverting amplifier A2 of a resistance of the resistor R1.

4. 发明专利

JPH0833094A MULTIWAY SPEAKER SYSTEM 失效
公开(公告)号：JPH0833094A
公开(公告)日：1996-02-02
申请号：JP18894294
申请日：1994-07-19
申请人： KENWOOD CORP
发明人： OKUMA TATSUHIKO , MATSUBARA YUKINARI , YAMAUCHI KAORU , HASHIZUMI KAZUHIKO
IPC分类号： H04R3/00 , H04R3/14
摘要： PURPOSE:To improve reproduced sound tone quality by reducing the signal route length difference in which the plus side and the minus side from the input terminal for every speaker unit to the speaker unit are combined. CONSTITUTION:Between a plus input terminal IN (+) and a minus input terminal IN (-), a speaker unit 3 for low-frequency sound is connected via the low- pass filter 2 of a dividing network 1B, and a speaker unit 5 for high-frequency sound is connected via a high-pass filter 4 and a winding-shaped signal route length correction element 6. The signal route length correction element 6 is the same material as the coil L1 of the low-pass filter 2 and is formed in a manner of non-inductive of line material of a prescribed diameter by almost the same winding length as the coil L1. By providing the signal route length correction element 6, the time difference of music signals added to the speaker unit 3 for low-frequency sound and the speaker unit 5 for high-frequency sound becomes small. Therefore, the acoustic time difference produced from each speaker unit 3 for low-frequency sound and the speaker unit 5 for high-frequency sound can be reduced and a clear localization of sound image can be obtained at the time of a stereo reproduction.

5. 发明专利

JP2009010824A Acoustic apparatus and driving method of speaker 审中-公开
标题翻译：声音装置和扬声器的驱动方法
公开(公告)号：JP2009010824A
公开(公告)日：2009-01-15
申请号：JP2007171678
申请日：2007-06-29
申请人： Kenwood Corp , 株式会社ケンウッド
发明人： SHINNAI SATORU , OKUMA TATSUHIKO , NAKAMURA MASAMI
IPC分类号： H04R3/04
摘要： PROBLEM TO BE SOLVED: To provide an acoustic apparatus capable of accurately controlling the vibration system of a speaker.
SOLUTION: The acoustic apparatus of the invention has an input means (correction part 21) for inputting audio signal, a correction means (correction part 21) for correcting the audio signal input through the input means according to characteristics corresponding to the input/output characteristics of the speaker to be driven, and an output means (amplification part 22) for outputting the audio signal corrected by the correction means to the speaker.
COPYRIGHT: (C)2009,JPO&INPIT
摘要翻译：要解决的问题：提供能够精确地控制扬声器的振动系统的声学装置。解决方案：本发明的声学装置具有用于输入音频信号的输入装置（校正部分21），校正装置（校正部分21），用于根据对应于输入的特性校正通过输入装置输入的音频信号 /要驱动的扬声器的输出特性，以及用于将由校正装置校正的音频信号输出到扬声器的输出装置（放大部分22）。版权所有（C）2009，JPO＆INPIT

6. 发明专利

JPH0936674A POWER RIPPLE SUPPRESSION CIRCUIT FOR DIFFERENTIAL AMPLIFIER 失效
公开(公告)号：JPH0936674A
公开(公告)日：1997-02-07
申请号：JP20837895
申请日：1995-07-24
申请人： KENWOOD CORP
发明人： SATO HIROYUKI , OKUMA TATSUHIKO
IPC分类号： H03F3/45 , H03F1/30
摘要： PROBLEM TO BE SOLVED: To reduce the fluctuation of output voltage caused by the ripples regardless of the amplification degree of a differential amplifier by providing a voltage dividing circuit which divides the voltage of the power line of the differential amplifier and a circuit which supplies the divided voltage to an inverted or non-inverted terminal. SOLUTION: The voltage of a +B power line is divided by the impedance elements Z1 and Z3 and supplied to an inverted terminal (-) of a differential amplifier 1, and the voltage of a -B power line is divided by the impedance elements Z2 and Z3 and supplied to the inverted input terminal (-) of the amplifier 1. In such a constitution, the fluctuation components such as the ripples of both +B and -B power supplies, etc., are supplied to the inverted input terminal (-) of the amplifier 1. Thus a signal that lacks the voltage fluctuation and the in-phase component supplied to the inverted input terminal (-) emerges to the output of the amplifier 1. Therefore, it is possible to suppress the ripples superimposed on the power lines down to a desired level and the desired frequency without affecting the amplification degree of the amplifier 1.

7. 发明专利

JPH06120747A DIFFERENTIAL AMPLIFIER 失效
公开(公告)号：JPH06120747A
公开(公告)日：1994-04-28
申请号：JP27149692
申请日：1992-10-09
申请人： KENWOOD CORP
发明人： FUKUSHIMA AKIHIRO , OKUMA TATSUHIKO
IPC分类号： H03F3/45 , H03F1/22
摘要： PURPOSE:To attain an exact differential amplification by preventing the bias currents of a cascode boot-strap circuit from being superimposed on the constant current circuit of a differential amplifier by an emitter follower circuit, reducing a constant current fluctuation, and improving the constant current characteristic of the differential amplifier. CONSTITUTION:A bias circuit 5 of a first cascode boot-strap circuit 3 is constituted through an emitter follower circuit 6 connected with the common emitters of a pair of first and second transistors Q1 and Q2 by a level shift diode D3. Then, a second cascode boot-strap circuit 7 is provided between a constant current circuit 4 and a negative supply power source -Vcc, and the bias voltage of the second cascode boot-strap circuit 7 is biased by a level shift circuit 8 of the emitter follower circuit 6.

8. 发明专利

JPH04150117A SIGNAL TRANSMISSION CIRCUIT 失效
公开(公告)号：JPH04150117A
公开(公告)日：1992-05-22
申请号：JP26955590
申请日：1990-10-09
申请人： KENWOOD CORP
发明人： SATO HACHIRO , OKUMA TATSUHIKO , NAKAJIMA DAISUKE , KOIDE KIICHIRO , TAKAHASHI KENICHI , FUKUSHIMA AKIHIRO
IPC分类号： H04B15/00
摘要： PURPOSE:To prevent degradation in the quality of a transmission signal due to a noise current by providing a buffer circuit between an earth circuit for a signal sending side device and a signal receiving side device and the earth line of a signal circuit of a device. CONSTITUTION:This circuit is provided with a buffer circuit 8 whose gain is the unity, its noninverting input terminal is connected to an earth line (a), an inverting input terminal is connected to the output terminal of the circuit 8 and its output terminal is connected to an earth line (b). On the other hand, a positive voltage from a rectifier circuit 4 is fed to the circuit 8 through a power supply line (d) and a negative voltage from the rectifier circuit 4 is fed to the circuit 8 through a power supply line (c). Thus, a noise current I flows to the output terminal of the circuit 8 through the line (b) and flows from the output terminal to the circuit 8 through the lines (d), (c) and flows to an earth line (k) through electrolytic capacitors C1, C2. Moreover, the noise current I flows from the line point (k) to a power transformer 5 through the circuit 4. Thus, the occurrence of crossmodulation distortion and interference, etc., due to the noise current I in a signal circuit is not caused and the degradation of the quality of a transmission signal is prevented.

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