Patents by Inventor Hiroaki Nagano

Hiroaki Nagano has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6976401
    Abstract: An offset rotary joint unit equipped with a rotation correction mechanism, in which a bending motion can be executed in a two-dimensional plane only by virtue of a rotary mechanism and which can support a high-load weight and is applicable for two-arm mechanisms such as nursing assistant robots. One offset rotary joint unit 4 is composed of a first arm 1, a rotation correction arm 2 rotationally driven around the axial line of the first arm, and a second arm 3 rotationally driven around an axial line obliquely intersecting with the rotation correction arm.
    Type: Grant
    Filed: July 9, 2002
    Date of Patent: December 20, 2005
    Assignee: National Aerospace Laboratory of Japan
    Inventors: Osamu Okamoto, Teruomi Nakaya, Isao Yamaguchi, Seizo Suzuki, Jyunichi Ueno, Yasuoki Usui, Hiroaki Nagano, Katsuhiko Renbutsu, Mitsuharu Izaki, Tadashi Kishimoto
  • Patent number: 6970715
    Abstract: In the portable telephone of the present invention, a transmission power upper limit value (STEPLIM) in accordance with temperature (T) is found (S1, S2), whether the transmission power set value (STEPn) of the next slot exceeds the upper limit (STEPLIM) or not is determined (S3, S4), and when it does not exceed, a control signal value (Vc) in accordance with the transmission power set value (STEPn) is applied to a variable gain block (11, 13) (S5, S7). When it exceeds the upper limit, a control signal value (Vc) in accordance with the transmission power upper limit value (STEPLIM) is applied to the variable gain block (11, 13) (S6, S7).
    Type: Grant
    Filed: August 1, 2001
    Date of Patent: November 29, 2005
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Yoshinori Matsunami, Hiroaki Nagano, Shinjirou Fukuyama, Mitsuru Mochizuki, Kazuhito Niwano, Hirokazu Shimizu
  • Publication number: 20050179136
    Abstract: In a multi-layer substrate module receiving from an external earth node (20) supply of a reference potential (Vss) for grounding, a plurality of ground lines (170-1, 170-2, 170-3) are provided respectively corresponding to a plurality of internal circuits (210, 220, 230). Moreover, a common node (Ncmn) for coupling the ground lines (170-1, 170-2, 170-3) is provided in an insulating layer (105C) of the multi-layer substrate module. The common node (Ncmn) is electrically coupled to the earth node 20 through a ground pin terminal 204 shared by the plurality of internal circuits (210, 220, 230). Preferably, the common node (Ncmn) is provided in the lowest insulating layer of the multi-layer substrate module. Thus, parasitic inductance of the portion through which an earth current flows, that is, the portion common to the plurality of internal circuits (210, 220, 230), can be suppressed with a small number of ground pin terminals.
    Type: Application
    Filed: April 19, 2005
    Publication date: August 18, 2005
    Applicant: MITSUBISHI DENKI KABUSHIKI KAISHA
    Inventors: Takatoshi Katsura, Kenji Itoh, Hiroaki Nagano, Youji Isota, Mitsuhiro Shimozawa, Tadashi Takagi, Noriharu Suematsu, Masayoshi Ono, Kenichi Maeda
  • Patent number: 6906411
    Abstract: In a multi-layer substrate module receiving from an external earth node supply of a reference potential for grounding, a plurality of ground lines are provided respectively corresponding to a plurality of internal circuits. Moreover, a common node for coupling the ground lines is provided in an insulating layer of the multi-layer substrate module. The common node is electrically coupled to the earth node through a ground pin terminal shared by the plurality of internal circuits. Preferably, the common node is provided in the lowest insulating layer of the multi-layer substrate module. Thus, parasitic inductance of the portion through which an earth current flows, that is, the portion common to the plurality of internal circuits, can be suppressed with a small number of ground pin terminals. Accordingly, the inflow phenomenon of the earth current between the plurality of internal circuits is prevented, enabling stable operation.
    Type: Grant
    Filed: June 29, 2000
    Date of Patent: June 14, 2005
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Takatoshi Katsura, Kenji Itoh, Hiroaki Nagano, Youji Isota, Mitsuhiro Shimozawa, Tadashi Takagi, Noriharu Suematsu, Masayoshi Ono, Kenichi Maeda
  • Patent number: 6873208
    Abstract: A high-frequency amplifying unit 2 in which a steep gain variation developed according to a change in the amplitude of input high-frequency signal is suppressed is provided. It amplifies an input high-frequency signal with a plurality of transistors 12-1 to 12-N at the same time a measuring circuit 27 measures amplitude of the input high-frequency signal, and a bias control circuit 26 continuously controls a bias applied to each transistors 12-1 to 12-N according to the value of amplitude measured by the measuring circuit 27. Thus it is possible to suppress a steep gain variation produced according to a variation in the amplitude of input high-frequency signal.
    Type: Grant
    Filed: June 29, 2001
    Date of Patent: March 29, 2005
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Shintaro Shinjo, Kazutomi Mori, Hiroyuki Joba, Hiroaki Nagano, Mitsuru Motizuki, Yukio Ikeda, Noriharu Suematsu
  • Patent number: 6832098
    Abstract: In a mobile phone according to the invention, a sum of a power control amount (&Dgr;P) instructed by a base station and a sending power (Px) detected by a sending power detecting portion (15) obtained to calculate a sending power (Px′) for a next slot (S1-S3), it is determined whether the sending power (Px′) is equal to or lower than a maximum sending power (Pmax) or not (S4), a power control is performed in accordance with an instruction of the base station when a relationship of (Px′≦Pmax) is present (S5), a value X satisfying (Px′−X≦Pmax) is calculated when the relationship of (Px′≦Pmax) is not present (S6), and the sending power is changed by (&Dgr;P−X) (S7).
    Type: Grant
    Filed: June 6, 2002
    Date of Patent: December 14, 2004
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Yoshinori Matsunami, Hiroaki Nagano, Shinjirou Fukuyama, Mitsuru Mochizuki, Kazuhito Niwano, Hirokazu Shimizu
  • Publication number: 20040075496
    Abstract: The conventional amplifying device and receiver involve a problem that the gain varies excessively in amplifying a signal containing noise. Accordingly, an amplifying device and receiver of the invention comprise variable-gain amplifying means for amplifying and outputting an analog signal, detecting means for detecting a signal level of the analog signal, selecting means for selecting a relatively great signal level from the signal levels detected by the detecting means, and gain control means for controlling the gain in the variable-gain amplifying means on the basis of the signal level selected by the selecting means.
    Type: Application
    Filed: August 29, 2003
    Publication date: April 22, 2004
    Inventors: Tatsuya Ito, Hiroaki Nagano
  • Patent number: 6721551
    Abstract: A reception carrier wave, a first transmission carrier wave, and a second transmission carrier wave are generated. The reception carrier wave is mixed with the reception wave to produce a reception signal. The frequency of the first transmission carrier wave is halved, and the first transmission carrier wave is mixed with a transmission signal to produce a modulated wave. The second transmission carrier wave is mixed with the modulated wave to produce a transmission wave. Since neither the frequency of the first transmission carrier wave nor the frequency of the second transmission carrier wave agrees with each of the frequency of the modulated wave and the frequency fTX, the degradation of the modulation precision on a transmission side can be prevented. Also, because the frequency of the first transmission carrier wave is halved, the interference of the first transmission carrier wave with the transmission signal band can be reduced.
    Type: Grant
    Filed: October 3, 2001
    Date of Patent: April 13, 2004
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Hiroaki Nagano, Kazuhiro Mori, Kenji Itoh
  • Patent number: 6721543
    Abstract: A wireless terminal device includes a transmitting circuit, an isolator, a band pass filter, a switch, a transmitting antenna, a receiving circuit, a band pass filter, a switch, a receiving antenna, a high-pass filter, a low-pass filter and an input/output port. A transmission wave of a frequency is conveyed from the transmitting circuit to the input/output port via the isolator, the band pass filter and the low pass filter, and further to a vehicle antenna. Here, the transmission wave in the direction towards the receiving circuit is blocked by the high-pass filter. On the other hand, a reception wave of a frequency is conveyed from the vehicle antenna to the input/output port, and to the receiving circuit via the high-pass filter and the band pass filter. Here, the reception wave in the direction towards the transmitting circuit is blocked by the low-pass filter.
    Type: Grant
    Filed: October 24, 2000
    Date of Patent: April 13, 2004
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Takatoshi Katsura, Kenji Itoh, Shinjirou Fukuyama, Mitsuru Mochizuki, Hiroaki Nagano, Yoshinori Matsunami
  • Patent number: 6683925
    Abstract: A level of a base band signal at an input side of a variable gain amplification circuit is detected by a logarithmic amplifier having a wide input voltage range at a start of an operation, a control unit then performs a coarse feedforward control on a gain of the variable gain amplifier based on the detected level and finds a level of an output of an A/D converter by a mean square deriving circuit and inputs the resulting signal to the control unit. Then the control unit performs a fine feedback control on the variable gain amplifier based on the detected level.
    Type: Grant
    Filed: October 24, 2000
    Date of Patent: January 27, 2004
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Takatoshi Katsura, Kenji Itoh, Shinjirou Fukuyama, Mitsuru Mochizuki, Hiroaki Nagano, Yoshinori Matsunami, Fumio Ishizu, Ryoji Hayashi
  • Publication number: 20030215034
    Abstract: A level of a base band signal at an input side of a variable gain amplification circuit is detected by a logarithmic amplifier having a wide input voltage range at a start of an operation, a control unit then performs a coarse feedforward control on a gain of the variable gain amplifier based on the detected level and finds a level of an output of an A/D converter by a mean square deriving circuit and inputs the resulting signal to the control unit. Then the control unit performs a fine feedback control on the variable gain amplifier based on the detected level.
    Type: Application
    Filed: June 18, 2003
    Publication date: November 20, 2003
    Inventors: Takatoshi Katsura, Kenji Itoh, Shinjirou Fukuyama, Mitsuru Mochizuki, Hiroaki Nagano, Yoshinori Matsunami, Fumio Ishizu, Ryoji Hayashi
  • Patent number: 6650181
    Abstract: A high-frequency amplifying unit 2 in which a steep gain variation developed according to a change in the amplitude of input high-frequency signal is suppressed is provided. It amplifies an input high-frequency signal with a transistor 12 at the same time a measuring circuit 27 measures amplitude of the input high-frequency signal, and a bias control circuit 26 continuously controls a bias applied to the transistor 12 according to the value of amplitude measured by the measuring circuit 27. Thus it is possible to suppress a steep gain variation produced according to a variation in the amplitude of input high-frequency signal.
    Type: Grant
    Filed: June 25, 2002
    Date of Patent: November 18, 2003
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Shintaro Shinjo, Kazutomi Mori, Hiroyuki Joba, Hiroaki Nagano, Mitsuru Motizuki, Yukio Ikeda, Noriharu Suematsu
  • Publication number: 20030157956
    Abstract: In the portable telephone of the present invention, a transmission power upper limit value (STEPLIM in accordance with temperature (T) is found (S1, S2), whether the transmission power set value (STEPn) of the next slot exceeds the upper limit (STEPLIM) or not is determined (S3, S4), and when it does not exceed, a control signal value (Vc) in accordance with the transmission power set value (STEPn) is applied to a variable gain block (11, 13) (S5, S7). When it exceeds the upper limit, a control signal value (Vc) in accordance with the transmission power upper limit value (STEPLIM) is applied to the variable gain block (11, 13) (S6, S7).
    Type: Application
    Filed: January 31, 2003
    Publication date: August 21, 2003
    Inventors: Yoshinori Matsunami, Hiroaki Nagano, Shinjirou Fukuyama, Mitsuru Mochizuki, Kazuhito Niwano, Hirokazu Shimizu
  • Publication number: 20030048135
    Abstract: A high-frequency amplifying unit 2 in which a steep gain variation developed according to a change in the amplitude of input high-frequency signal is suppressed is provided. It amplifies an input high-frequency signal with a plurality of transistors 12-1 to 12-N at the same time a measuring circuit 27 measures amplitude of the input high-frequency signal, and a bias control circuit 26 continuously controls a bias applied to each transistors 12-1 to 12-N according to the value of amplitude measured by the measuring circuit 27. Thus it is possible to suppress a steep gain variation produced according to a variation in the amplitude of input high-frequency signal.
    Type: Application
    Filed: July 2, 2002
    Publication date: March 13, 2003
    Inventors: Shintaro Shinjo, Kazutomi Mori, Hiroyuki Joba, Hiroaki Nagano, Mitsuru Motizuki, Yukio Ikeda, Norihasu Suematsu
  • Publication number: 20030010148
    Abstract: An offset rotary joint unit equipped with a rotation correction mechanism, in which a bending motion can be executed in a two-dimensional plane only by virtue of a rotary mechanism and which can support a high-load weight and is applicable for two-arm mechanisms such as nursing assistant robots. One offset rotary joint unit 4 is composed of a first arm 1, a rotation correction arm 2 rotationally driven around the axial line of the first arm, and a second arm 3 rotationally driven around an axial line obliquely intersecting with the rotation correction arm.
    Type: Application
    Filed: July 9, 2002
    Publication date: January 16, 2003
    Applicant: National Aerospace Laboratory of Japan
    Inventors: Osamu Okamoto, Teruomi Nakaya, Isao Yamaguchi, Seizo Suzuki, Jyunichi Ueno, Yasuoki Usui, Hiroaki Nagano, Katsuhiko Renbutsu, Mitsuharu Izaki, Tadashi Kishimoto
  • Publication number: 20020171483
    Abstract: A high-frequency amplifying unit 2 in which a steep gain variation developed according to a change in the amplitude of input high-frequency signal is suppressed is provided. It amplifies an input high-frequency signal with a transistor 12 at the same time a measuring circuit 27 measures amplitude of the input high-frequency signal, and a bias control circuit 26 continuously controls a bias applied to the transistor 12 according to the value of amplitude measured by the measuring circuit 27. Thus it is possible to suppress a steep gain variation produced according to a variation in the amplitude of input high-frequency signal.
    Type: Application
    Filed: June 25, 2002
    Publication date: November 21, 2002
    Inventors: Shintaro Shinjo, Kazutomi Mori, Hiroyuki Joba, Hiroaki Nagano, Mitsuru Motizuki, Yukio Ikeda, Noriharu Suematsu
  • Patent number: 6449471
    Abstract: In a cellular telephone having a receiving circuit of a direct conversion type using an even harmonic orthogonal mixer, high-pass filters for removing a DC offset component are arranged before and after a variable gain amplifier in a base band circuit. The DC offset component occurred in the even harmonic orthogonal mixer is always constant, and the DC offset component occurred in the variable gain amplifier frequently varies so that a cutoff frequency of the front high-pass filter is set to be lower than a cutoff frequency of the rear high-pass filter, and the frequencies are set to achieve a fast transition response.
    Type: Grant
    Filed: November 8, 2000
    Date of Patent: September 10, 2002
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Takatoshi Katsura, Kenji Itoh, Shinjirou Fukuyama, Mitsuru Mochizuki, Hiroaki Nagano, Yoshinori Matsunami, Mitsuhiro Shimozawa, Fumio Ishizu, Ryoji Hayashi
  • Patent number: 6430475
    Abstract: The present invention provides contact sensors capable of determining the pressure distribution over the whole surface of each of joint units having a cylindrical shape, both end portions of which are cut at an offset angle, and constituting robot arms. In order to provide a technology enabling real-time drive control of the robot arms by using detected values from these sensors, the points of intersection of the electrodes are distributed across the whole surface of each joint by forming a pressure-sensitive sheet sensor in which column electrodes arranged in parallel, and row electrodes arranged in a wound-string shape, are combined, these joints having a cylindrical shape, both end portions of which are cut at an offset angle. In addition, by making an electrode structure that covers a prescribed width in both rows and columns, the number of signal output terminals is reduced and the operation processing load is lightened.
    Type: Grant
    Filed: April 10, 2001
    Date of Patent: August 6, 2002
    Assignee: National Aerospace Laboratory of Japan
    Inventors: Osamu Okamoto, Teruomi Nakaya, Heihachiro Kamimura, Isao Yamaguchi, Seizo Suzuki, Kazuyoshi Yabuuchi, Jyunichi Ueno, Yasuoki Usui, Hiroaki Nagano, Katsuhiko Renbutsu, Mitsuharu Izaki
  • Patent number: 6373907
    Abstract: At the onset of an operation, a level of a base band signal at an input side of a variable gain amplifying circuit is detected by a logarithmic amplifier having a wide dynamic range, and, a control unit controls a gain of a low-noise amplifier in a previous step of a low-pass filter based on the detected level and also controls a gain of variable gain amplifier, whereby saturation at an analog base band portion is prevented even when the level of the input signal is high.
    Type: Grant
    Filed: October 25, 2000
    Date of Patent: April 16, 2002
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Takatoshi Katsura, Kenji Itoh, Shinjirou Fukuyama, Mitsuru Mochizuki, Hiroaki Nagano, Yoshinori Matsunami, Fumio Ishizu, Ryoji Hayashi
  • Publication number: 20020037702
    Abstract: A reception carrier wave, of which a frequency fL0 agrees with a frequency fRX of a reception wave, is generated, a first transmission carrier wave, of which a frequency fL1 is equivalent to twice of a difference value between the reception frequency and a frequency fTX of a transmission wave, is generated, and a second transmission carrier wave of which a frequency fL2 is equivalent to a difference value between the frequency fL0 and the frequency fL1, is generated. The reception carrier wave mixed with the reception wave to produce a reception signal. The frequency of the first transmission carrier wave is halved, and the first transmission carrier wave is mixed with a transmission signal to produce a modulated wave. The second transmission carrier wave is mixed with the modulated wave to produce a transmission wave.
    Type: Application
    Filed: October 3, 2001
    Publication date: March 28, 2002
    Applicant: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Hiroaki Nagano, Kazuhiro Mori, Kenji Itoh