Patents by Inventor Hidehiko Kuroda

Hidehiko Kuroda 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).

  • Publication number: 20070120602
    Abstract: A variable gain power amplifier includes a power amplifying unit and a signal generating unit. The power amplifying unit includes a control terminal, and a gain of the power amplifying unit is variable by a control signal provided through the control terminal. The signal generating unit generates the control signal to be provided to the control terminal. The signal generating unit includes a switching circuit to be turned on and off by a binary signal, a constant current source that generates a constant current, and a variable current source that generates a variable current. Also, the signal generating unit generates, when the switching circuit is on, a control signal of a magnitude that turns on the power amplifying unit and depends on a magnitude of a sum of the constant current and the variable current. When the switching circuit is off, the signal generating unit generates a control signal of a magnitude that turns off the power amplifying unit.
    Type: Application
    Filed: November 13, 2006
    Publication date: May 31, 2007
    Inventor: Hidehiko Kuroda
  • Patent number: 7104133
    Abstract: A torsional vibration measuring instrument has a plurality of reflecting means (6, 7) arranged with stipulated intervals along surface of a rotator (5) of which torsional vibration is to be measured; a pulse light irradiating means (1, 2) for irradiating a repetitive pulse light beam to the reflecting means; and an outgoing-transmitting means (3, 4) for transmitting the irradiated pulse light beam. The torsional vibration measuring instrument also has a plurality of transmitting-receiving means (8, 9) for irradiating the transmitted pulse light beam to the reflecting means, and for receiving reflected pulse light beams which have been reflected by the reflecting means; and an incoming-transmitting means (3, 4) for transmitting the reflected pulse light beams which have been received.
    Type: Grant
    Filed: March 28, 2003
    Date of Patent: September 12, 2006
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Hidehiko Kuroda, Shigeru Kanemoto, Michio Sato, Kiyoto Oyagi
  • Publication number: 20060055053
    Abstract: A semiconductor device is provided including a semiconductor element having a circuit and at least one electrode of the circuit, a flexible substrate having at least one electrode pad and surrounding the semiconductor element, a conductor for connecting the electrode with the electrode pad, and a plurality of solder bumps on the electrode pad, wherein at least a first portion between a surface facing the solder bumps of the semiconductor element and the flexible substrate is not fixed by adhesion.
    Type: Application
    Filed: November 7, 2005
    Publication date: March 16, 2006
    Inventors: Takao Yamazaki, Hirobumi Inoue, Ichiro Hazeyama, Sakae Kitajo, Masahiro Kubo, Yoshimichi Sogawa, Hidehiko Kuroda
  • Patent number: 6998704
    Abstract: A semiconductor device is provided including a semiconductor element having a circuit and at least one electrode of the circuit, a flexible substrate having at least one electrode pad and surrounding the semiconductor element, a conductor for connecting the electrode with the electrode pad, and a plurality of solder bumps on the electrode pad, wherein at least a first portion between a surface facing the solder bumps of the semiconductor element and the flexible substrate is not fixed by adhesion.
    Type: Grant
    Filed: August 21, 2003
    Date of Patent: February 14, 2006
    Assignee: NEC Corporation
    Inventors: Takao Yamazaki, Hirobumi Inoue, Ichiro Hazeyama, Sakae Kitajo, Masahiro Kubo, Yoshimichi Sogawa, Hidehiko Kuroda
  • Publication number: 20050092092
    Abstract: A torsional vibration measuring instrument has a plurality of reflecting means (6, 7) arranged with stipulated intervals along surface of a rotator (5) of which torsional vibration is to be measured; a pulse light irradiating means (1, 2) for irradiating a repetitive pulse light beam to the reflecting means; and an outgoing-transmitting means (3, 4) for transmitting the irradiated pulse light beam. The torsional vibration measuring instrument also has a plurality of transmitting-receiving means (8, 9) for irradiating the transmitted pulse light beam to the reflecting means, and for receiving reflected pulse light beams which have been reflected by the reflecting means; and an incoming-transmitting means (3, 4) for transmitting the reflected pulse light beams which have been received.
    Type: Application
    Filed: March 28, 2003
    Publication date: May 5, 2005
    Inventors: Hidehiko Kuroda, Shigeruy Kanemoto, Michio Sato, Kiyoto Oyagi
  • Publication number: 20040115920
    Abstract: A semiconductor device is provided including a semiconductor element having a circuit and at least one electrode of the circuit, a flexible substrate having at least one electrode pad and surrounding the semiconductor element, a conductor for connecting the electrode with the electrode pad, and a plurality of solder bumps on the electrode pad, wherein at least a first portion between a surface facing the solder bumps of the semiconductor element and the flexible substrate is not fixed by adhesion.
    Type: Application
    Filed: August 21, 2003
    Publication date: June 17, 2004
    Applicant: NEC CORPORATION
    Inventors: Takao Yamazaki, Hirobumi Inoue, Ichiro Hazeyama, Sakae Kitajo, Masahiro Kubo, Yoshimichi Sogawa, Hidehiko Kuroda
  • Patent number: 6509798
    Abstract: The variable gain amplifier includes a parallel connection of resistance R2 and capacitor C2. Resistance R2 may be replaced by inductance L, and bipolar transistors may be replaced by other types such MOS transistors. Resistance R2 gives a current feedback for transistor Q2, thereby lowering the mutual conductance “gm” of transistor Q2, and limiting the current flowing from voltage supply V0. The emitter area ratio (the emitter area of transistor Q2: the emitter area of Q3) made to be 1: n where “n” is greater than or equal to 1, thereby controlling each current. Capacitor C2 is connected in parallel with R2 connected with the base of transistor Q2 is a bypass capacitor for lowering the impedance of the base of transistor Q2 in higher frequency range. Capacitor C2 is a peaking capacitor, because it improves the high frequency characteristics.
    Type: Grant
    Filed: June 22, 2001
    Date of Patent: January 21, 2003
    Assignee: NEC Compound Semiconductor Devices Ltd.
    Inventor: Hidehiko Kuroda
  • Patent number: 6460422
    Abstract: A torque measuring device including a light irradiation element for irradiating a light, and a control unit operatively connected to the irradiation element so as to branch the light into a plurality of lights as beams and control a beam diameter of the respective lights so as to irradiate the lights on a surface of a member to be measured. The torque measuring device further includes a plurality of reflectors disposed on the surface of the member to be measured so as to change reflection state of the respective lights, a plurality of detectors for detecting the changes of intensities of the respective reflected lights and generating signals thereof, and a signal processor for processing the generated signals and operating a rotation period on the basis of the generated signals thereby to calculate a torque of the member to be measured.
    Type: Grant
    Filed: October 31, 2000
    Date of Patent: October 8, 2002
    Assignees: Kabushiki Kaisha Toshiba, The Tokyo Electric Power Co., Inc.
    Inventors: Hidehiko Kuroda, Shigeru Kanemoto, Michio Sato, Takuhisa Kondo, Makoto Ochiai, Hitoshi Sakakida, Tatsuo Yamashita, Kiyoto Oyagi, Shuuichi Umezawa, Kazuo Saito, Hajime Obikawa
  • Patent number: 6384668
    Abstract: The present invention provides a charge pump circuit capable of operating at a high speed with a low power source voltage and increasing the synchronization processing speed. The charge pump circuit comprises: a first switch circuit 15 connected between a first input node 12 through which a first signal CPin1 is input and a base of an NPN transistor Q4, for controlling the NPN transistor Q4 in response to the first signal CPin1; and a second switch circuit 16 connected between a second input node 13 and a base of an NPN transistor Q9, for controlling the NPN transistor Q9 in response to a second signal CPin2. The transistors Q4 and Q9, and transistors contained in the first and the second switch circuits 15 and 16 are all NPN transistors.
    Type: Grant
    Filed: January 28, 2000
    Date of Patent: May 7, 2002
    Assignee: NEC Corporation
    Inventor: Hidehiko Kuroda
  • Publication number: 20020008582
    Abstract: The variable gain amplifier includes a parallel connection of resistance R2 and capacitor C2. Resistance R2 may be replaced by inductance L, and bipolar transistors may be replaced by other types such MOS transistors. Resistance R2 gives a current feedback for transistor Q2, thereby lowering the mutual conductance “gm” of transistor Q2, and limiting the current flowing from voltage supply V0. The emitter area ratio (the emitter area of transistor Q2: the emitter area of Q3) made to be 1: n where “n” is greater than or equal to 1, thereby controlling each current. Capacitor C2 is connected in parallel with R2 connected with the base of transistor Q2 is a bypass capacitor for lowering the impedance of the base of transistor Q2 in higher frequency range. Capacitor C2 is a peaking capacitor, because it improves the high frequency characteristics.
    Type: Application
    Filed: June 22, 2001
    Publication date: January 24, 2002
    Applicant: NEC Corporation
    Inventor: Hidehiko Kuroda
  • Patent number: 6326842
    Abstract: A variable gain amplifying apparatus which can accurately set a predetermined gain for amplifying. The variable gain amplifying apparatus has a first amplifying circuit, a second amplifying circuit and a third amplifying circuit. The first amplifying circuit can control a first gain during an operation. The second amplifying circuit is coupled to an output of the first amplifying circuit, in which a gain is fixed during an operation. The third amplifying circuit coupled to an output of the second amplifying circuit, in which a gain can be controlled during an operation. The apparatus can avoid deterioration in a distortion characteristic, an increase in a total noise figure and an increase in a consumptive electric power.
    Type: Grant
    Filed: November 16, 2000
    Date of Patent: December 4, 2001
    Assignee: NEC Corporation
    Inventor: Hidehiko Kuroda
  • Publication number: 20010045850
    Abstract: The present invention provides a charge pump circuit capable of operating at a high speed with a low power source voltage and increasing the synchronization processing speed. The charge pump circuit comprises: a first switch circuit 15 connected between a first input node 12 through which a first signal CPin1 is input and a base of an NPN transistor Q4, for controlling the NPN transistor Q4 in response to the first signal CPin1; and a second switch circuit 16 connected between a second input node 13 and a base of an NPN transistor Q9, for controlling the NPN transistor Q9 in response to a second signal CPin2. The transistors Q4 and Q9, and transistors contained in the first and the second switch circuits 15 and 16 are all NPN transistors.
    Type: Application
    Filed: January 28, 2000
    Publication date: November 29, 2001
    Inventor: Hidehiko Kuroda
  • Patent number: 6087819
    Abstract: A current mirror circuit for outputting an output current in proportion to an input current, comprises a first transistor having a collector through which the input current flows, a second transistor having a base connected to a base of the first transistor and a collector through which the output current flows, a third transistor having a base connected to a collector of the first transistor, and an emitter through which a predetermined current flows, and a fourth transistor having a base connected to an emitter of the third transistor, and an emitter connected to the base of the first and second transistors. A variable current source is connected between an emitter of the third transistor and ground to cause the predetermined current to flow through the third transistor. The value of the predetermined current is variable.
    Type: Grant
    Filed: November 5, 1998
    Date of Patent: July 11, 2000
    Assignee: NEC Corporation
    Inventor: Hidehiko Kuroda
  • Patent number: 6008655
    Abstract: For testing a frequency divider, oscillations are produced and wave-shaped into a series of dock pulses. The dock pulses are supplied to a frequency divider under test. A window pulse of duration equal to one cycle of the output pulses of the frequency divider is used to sample the clock pulses. The sampled clock pulses are counted and compared with a reference value. Depending on the number of the sampled clock pulses relative to the reference value, an output voltage at one of two discrete values is produced to indicate the result of the test.
    Type: Grant
    Filed: August 20, 1997
    Date of Patent: December 28, 1999
    Assignee: NEC Corporation
    Inventor: Hidehiko Kuroda
  • Patent number: 5974860
    Abstract: An oil detecting system for detecting a leakage oil by optical fluorescence measurement means even in the presence of external fluorescent light, for example, from parts and equipments of a vehicle and a plant comprises an irradiation apparatus for irradiating a light including an absorption wavelength of an oil to be detected and exciting molecules of the oil to make the oil fluoresce, a wavelength selection apparatus operatively connected to the irradiation apparatus and adapted to select a fluorescence wavelength of the leakage oil fluoresced by the irradiation apparatus, and an observation apparatus for detecting the fluorescence of the leakage oil and selecting only a period of observing fluorescing of the leakage oil over substantially the same time period that the leakage oil fluoresces light. A processing apparatus may be further provided so as to be operatively connected to the observation apparatus and adapted to process an image or a signal from the observation apparatus.
    Type: Grant
    Filed: May 9, 1997
    Date of Patent: November 2, 1999
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Hidehiko Kuroda, Naruhiko Mukai, Teturo Aikawa, Kunihiko Yokoyama, Masahiko Kuroki, Takashi Kokubo
  • Patent number: 5926062
    Abstract: A reference voltage generating circuit includes a constant current circuit, a current mirror circuit, and a load resistor. The constant current circuit generates a constant current proportional to a thermal electromotive force. The current mirror circuit uses the constant current generated by the constant current circuit as a reference current. The load resistor converts the output current of the current mirror circuit into a voltage.
    Type: Grant
    Filed: June 23, 1998
    Date of Patent: July 20, 1999
    Assignee: NEC Corporation
    Inventor: Hidehiko Kuroda
  • Patent number: 5875042
    Abstract: Disclosed is an image scanner, which has: a reflecting mirror for reflecting a light reflected from a scanned manuscript in a predetermined direction; a sub-scanning means for sequential sub-scanning which parallel moves on a plane which has an acute angle to the surface of the scanned manuscript while keeping the reflecting surface of the reflecting mirror perpendicular to the surface of the scanned manuscript; a focusing lens which focuses the light reflected from the scanned manuscript which is reflected by the reflecting mirror; and an one-dimensional image sensor which outputs a manuscript image by conducting a photoelectric conversion of the light reflected by the reflecting mirror which is focused on a light-receiving surface of the one-dimensional image sensor by the focusing lens.
    Type: Grant
    Filed: February 18, 1997
    Date of Patent: February 23, 1999
    Assignee: NEC Corporation
    Inventors: Atsushi Kashitani, Hidehiko Kuroda, Satoshi Segawa, Takahiko Tsujisawa