Patents by Inventor Shigeru Osada

Shigeru Osada 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: 7436276
    Abstract: A tuning circuit comprises, at least, a first circuit K1 which serially connects a first variable capacitor element 21a and a second variable capacitor element 31a, an inductance element 23a which is parallely connected to the first circuit K1 and constitutes a resonance circuit with the first circuit K1; a second circuit K2 which includes a switch element 26a and a third resistor 27a serially connected to each other and is parallely connected to the first circuit K1; and a first resistor 24a and a second resistor and 25a which are connected to both ends of the first variable capacitor element 21a, respectively and apply a predetermined tuning voltage.
    Type: Grant
    Filed: July 5, 2006
    Date of Patent: October 14, 2008
    Assignee: Alps Electric Co., Ltd.
    Inventors: Takeo Suzuki, Shigeru Osada
  • Patent number: 7368974
    Abstract: A signal adder circuit includes: an adding unit that includes at least a pair of amplification elements in which a constant current flows between ground terminals and a ground, input signals having different phases are input to input terminals, and output terminals to which a power supply voltage is applied are connected to each other; a gain control unit that is provided between the ground and each of the ground terminals of the amplification elements so as to adjust the amplitudes of the input signals having different phases; and a phase control unit that is provided between the ground and each of the ground terminals of the amplification elements so as to adjust the phases of the input signals having different phases.
    Type: Grant
    Filed: June 30, 2006
    Date of Patent: May 6, 2008
    Assignee: Alps Electric Co., Ltd.
    Inventors: Takeo Suzuki, Shigeru Osada
  • Patent number: 7209723
    Abstract: A direct conversion circuit includes first and second mixers to which a radio frequency signal is input. An oscillator supplies the first and second mixers with local oscillation signals whose phases are orthogonal to each other. A baseband processing circuit processes baseband signals output from the first and second mixers. A level-difference correcting circuit which corrects the two baseband signals input to the baseband processing circuit so that the levels of both are equal to each other is provided in a stage before the first and second mixers. The levels of the baseband signals are corrected by changing relative levels of the radio frequency signal input to the first mixer and the radio frequency signal input to the second mixer.
    Type: Grant
    Filed: March 16, 2004
    Date of Patent: April 24, 2007
    Assignee: ALPS Electric Co., Ltd.
    Inventors: Takeo Suzuki, Shigeru Osada
  • Publication number: 20070052865
    Abstract: A tuning circuit comprises, at least, a first circuit K1 which serially connects a first variable capacitor element 21a and a second variable capacitor element 31a, an inductance element 23a which is parallely connected to the first circuit K1 and constitutes a resonance circuit with the first circuit K1; a second circuit K2 which includes a switch element 26a and a third resistor 27a serially connected to each other and is parallely connected to the first circuit K1; and a first resistor 24a and a second resistor and 25a which are connected to both ends of the first variable capacitor element 21a, respectively and apply a predetermined tuning voltage.
    Type: Application
    Filed: July 5, 2006
    Publication date: March 8, 2007
    Inventors: Takeo Suzuki, Shigeru Osada
  • Publication number: 20070046529
    Abstract: A signal adder circuit includes: an adding unit that includes at least a pair of amplification elements in which a constant current flows between ground terminals and a ground, input signals having different phases are input to input terminals, and output terminals to which a power supply voltage is applied are connected to each other; a gain control unit that is provided between the ground and each of the ground terminals of the amplification elements so as to adjust the amplitudes of the input signals having different phases; and a phase control unit that is provided between the ground and each of the ground terminals of the amplification elements so as to adjust the phases of the input signals having different phases.
    Type: Application
    Filed: June 30, 2006
    Publication date: March 1, 2007
    Inventors: Takeo Suzuki, Shigeru Osada
  • Patent number: 6864776
    Abstract: In a coupling adjusting structure for a double-tuned circuit according to the present invention, first and second coils are configured such that a pair of first conductive patterns formed on a first surface of a printed circuit and a corresponding pair of second conductive patterns formed on a second surface of the printed circuit board are connected via corresponding connecting conductors, thereby making the first and second coils low and thin. Also, one end of the first coil and the corresponding end of the second coil are disposed close to each other, a first ground conductive pattern is disposed at least on the first surface of the printed circuit, and a first jumper connected to the first ground conductive pattern is disposed between the first and second coils so as to adjust an inductive coupling of the double-tuned circuit, thereby achieving a coupling adjusting structure for a double-tuned circuit whose inductive coupling is adjustable.
    Type: Grant
    Filed: September 25, 2003
    Date of Patent: March 8, 2005
    Assignee: Alps Electric Co., Ltd.
    Inventor: Shigeru Osada
  • Patent number: 6842198
    Abstract: A TV signal receiving tuner which is small in size and inexpensive due to a reduced number of local oscillators. In the TV signal receiving tuner, a local oscillation signal output from a local oscillator is directly applied to a first mixer through a first programmable divider to receive a UHF TV signal, the local oscillation signal output from the local oscillator is applied to the first mixer after its frequency is divided to 1/3 by the first programmable divider to receive a VHF high-band TV signal, and the local oscillation signal output from the local oscillator is applied to the first mixer after its frequency is divided to 1/5 by the first programmable divider to receive a VHF low-band TV signal.
    Type: Grant
    Filed: October 5, 2001
    Date of Patent: January 11, 2005
    Assignee: Alps Electric Co., Ltd.
    Inventors: Takeo Suzuki, Shigeru Osada
  • Patent number: 6822697
    Abstract: Needless signal that causes interference is prevented from entering to eliminate the generation of interfering signal. A television tuner is provided with a band switching circuit to which television signals of a plurality of channels arranged in a predetermined frequency band are supplied, the band switching circuit has a plurality of filters having the cutoff frequency of every one octave frequency in the predetermined frequency band, the cutoff frequency of the plurality of filters is made continuous every one octave in the predetermined frequency band, and the television signal of the channel to be received is sent out through a specified filter having the cutoff frequency within one octave from the frequency of the television signal of the channel to be received.
    Type: Grant
    Filed: July 28, 2000
    Date of Patent: November 23, 2004
    Assignee: Alps Electric Co., Ltd.
    Inventor: Shigeru Osada
  • Publication number: 20040185812
    Abstract: A direct conversion circuit includes first and second mixers to which a radio frequency signal is input. An oscillator supplies the first and second mixers with local oscillation signals whose phases are orthogonal to each other. A baseband processing circuit processes baseband signals output from the first and second mixers. A level-difference correcting circuit which corrects the two baseband signals input to the baseband processing circuit so that the levels of both are equal to each other is provided in a stage before the first and second mixers. The levels of the baseband signals are corrected by changing relative levels of the radio frequency signal input to the first mixer and the radio frequency signal input to the second mixer.
    Type: Application
    Filed: March 16, 2004
    Publication date: September 23, 2004
    Applicant: Alps Electric Co., Ltd.
    Inventors: Takeo Suzuki, Shigeru Osada
  • Patent number: 6784780
    Abstract: A coupling adjusting structure for a double-tuned circuit contains first and second coils that are configured such that a pair of first conductive patterns formed on a first surface of a printed circuit and a corresponding pair of second conductive patterns formed on a second surface of the printed circuit board are connected via corresponding connecting conductors. One end of the first coil and the corresponding end of the second coil are disposed close to each other. A first ground conductive pattern is disposed at least on the first surface of the printed circuit. A first jumper connected to the first ground conductive pattern is disposed between the first and second coils to adjust an inductive coupling of the double-tuned circuit.
    Type: Grant
    Filed: August 13, 2002
    Date of Patent: August 31, 2004
    Assignee: Alps Electric Co., Ltd.
    Inventor: Shigeru Osada
  • Patent number: 6731348
    Abstract: A television tuner includes a mixer circuit for receiving a television signal or an FM signal, and a local oscillator circuit for generating an oscillation signal received by the mixer circuit. When the television signal is received, a television intermediate-frequency signal is generated by the mixer circuit. When the FM broadcast signal is received, an FM intermediate-frequency signal having a frequency converted to about 10.7 MHz is generated by the mixer circuit.
    Type: Grant
    Filed: March 21, 2001
    Date of Patent: May 4, 2004
    Assignee: Alps Electric Co., Ltd.
    Inventors: Shigeru Osada, Masaki Yamamoto, Toshiro Furuta
  • Publication number: 20040058593
    Abstract: In a coupling adjusting structure for a double-tuned circuit according to the present invention, first and second coils are configured such that a pair of first conductive patterns formed on a first surface of a printed circuit and a corresponding pair of second conductive patterns formed on a second surface of the printed circuit board are connected via corresponding connecting conductors, thereby making the first and second coils low and thin. Also, one end of the first coil and the corresponding end of the second coil are disposed close to each other, a first ground conductive pattern is disposed at least on the first surface of the printed circuit, and a first jumper connected to the first ground conductive pattern is disposed between the first and second coils so as to adjust an inductive coupling of the double-tuned circuit, thereby achieving a coupling adjusting structure for a double-tuned circuit whose inductive coupling is adjustable.
    Type: Application
    Filed: September 25, 2003
    Publication date: March 25, 2004
    Inventor: Shigeru Osada
  • Patent number: 6707681
    Abstract: In the surface mount typed electronic circuit of the invention, an insulating substrate has an inductance element formed in a conductive pattern whose end portions are connected to the second lands. A bare chip is superimposed on the insulating substrate, so as to respectively connect the first electrodes and the second electrodes to the first lands and the second lands. Therefore, since the inductance element is positioned below the bare chip, the length of the connecting conductor between the inductance element and the semiconductor circuit can be extremely shortened, and a high-Q electronic circuit, especially in high-frequency, can be provided.
    Type: Grant
    Filed: January 17, 2003
    Date of Patent: March 16, 2004
    Assignee: Alps Electric Co., Ltd.
    Inventors: Takeo Suzuki, Shigeru Osada
  • Publication number: 20040029544
    Abstract: The direct current circuit comprises first to fourth mixers to which high frequency signals and a local oscillation signal having an equal frequency to that of the high frequency signal are inputted, and first and second multiplexer circuits which output components of a sum of two signals. A phase of the high frequency signals which are inputted to the first and second mixers and a phase of the high frequency signals which are inputted to the third and fourth mixers are made to differ from each other by &pgr;. A phase of the local oscillation signals which are inputted to the first and third mixers and a phase of the local oscillation signals which are inputted to the second and fourth mixers are made to differ from each other by &pgr;/2.
    Type: Application
    Filed: July 24, 2003
    Publication date: February 12, 2004
    Applicant: Alps Electric Co., Ltd.
    Inventors: Takeo Suzuki, Shigeru Osada
  • Patent number: 6639630
    Abstract: A switch circuit is provided for at least one of a previous stage of a VHF-band frequency converter and a previous stage of a UHF-band frequency converter. Each switch circuit passes a signal when a frequency converter at a subsequent stage of the switch circuit is operating, and does not pass a signal when the frequency converter at the subsequent stage of the switch circuit is not operating.
    Type: Grant
    Filed: February 1, 2000
    Date of Patent: October 28, 2003
    Assignee: Alps Electric Co., Ltd.
    Inventors: Shigeru Osada, Masaki Yamamoto, Yoshihiro Sato
  • Publication number: 20030174254
    Abstract: A switch circuit is provided for at least one of a previous stage of a VHF-band frequency converter and a previous stage of a UHF-band frequency converter. Each switch circuit passes a signal when a frequency converter at a subsequent stage of the switch circuit is operating, and does not pass a signal when the frequency converter at the subsequent stage of the switch circuit is not operating.
    Type: Application
    Filed: February 1, 2000
    Publication date: September 18, 2003
    Inventors: Shigeru Osada, Masaki Yamamoto, Yoshihiro Sato
  • Publication number: 20030137812
    Abstract: In the surface mount typed electronic circuit of the invention, an insulating substrate has an inductance element formed in a conductive pattern whose end portions are connected to the second lands. A bare chip is superimposed on the insulating substrate, so as to respectively connect the first electrodes and the second electrodes to the first lands and the second lands. Therefore, since the inductance element is positioned below the bare chip, the length of the connecting conductor between the inductance element and the semiconductor circuit can be extremely shortened, and a high-Q electronic circuit, especially in high-frequency, can be provided.
    Type: Application
    Filed: January 17, 2003
    Publication date: July 24, 2003
    Applicant: Alps Electric Co., Ltd.
    Inventors: Takeo Suzuki, Shigeru Osada
  • Patent number: 6559899
    Abstract: A digital television tuner is realized in which the construction of a baseband signal processing portion is simple, it is difficult for a local oscillation signal to leak to the input end side, and in which image interference is suppressed.
    Type: Grant
    Filed: June 21, 2000
    Date of Patent: May 6, 2003
    Assignee: Alps Electric Co., Ltd.
    Inventors: Takao Suzuki, Akira Takayama, Shigeru Osada
  • Publication number: 20030034868
    Abstract: In a coupling adjusting structure for a double-tuned circuit according to the present invention, first and second coils are configured such that a pair of first conductive patterns formed on a first surface of a printed circuit and a corresponding pair of second conductive patterns formed on a second surface of the printed circuit board are connected via corresponding connecting conductors, thereby making the first and second coils low and thin. Also, one end of the first coil and the corresponding end of the second coil are disposed close to each other, a first ground conductive pattern is disposed at least on the first surface of the printed circuit, and a first jumper connected to the first ground conductive pattern is disposed between the first and second coils so as to adjust an inductive coupling of the double-tuned circuit, thereby achieving a coupling adjusting structure for a double-tuned circuit whose inductive coupling is adjustable.
    Type: Application
    Filed: August 13, 2002
    Publication date: February 20, 2003
    Applicant: Alps Electric Co., Ltd.
    Inventor: Shigeru Osada
  • Publication number: 20020041340
    Abstract: A TV signal receiving tuner which is small in size and inexpensive due to a reduced number of local oscillators. In the TV signal receiving tuner, a local oscillation signal output from a local oscillator is directly applied to a first mixer through a first programmable divider to receive a UHF TV signal, the local oscillation signal output from the local oscillator is applied to the first mixer after its frequency is divided to ⅓ by the first programmable divider to receive a VHF high-band TV signal, and the local oscillation signal output from the local oscillator is applied to the first mixer after its frequency is divided to ⅕ by the first programmable divider to receive a VHF low-band TV signal.
    Type: Application
    Filed: October 5, 2001
    Publication date: April 11, 2002
    Applicant: Alps Electric Co., Ltd.
    Inventors: Takeo Suzuki, Shigeru Osada