Patents by Inventor Shinichi Kubota

Shinichi Kubota 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: 20080259979
    Abstract: A laser diode driving circuit capable of providing a suitable output current to a laser diode is disclosed. The laser diode driving circuit includes a current supply, a first pseudo laser diode, a second pseudo laser diode, and an output current mirror circuit. An input current provided by the current supply is output through the output current mirror circuit to the laser diode. By making the characteristic of each of the first and second pseudo laser diodes substantially equal to the characteristic of the laser diode, the non-linearity between the input current and the output current is compensated.
    Type: Application
    Filed: January 14, 2008
    Publication date: October 23, 2008
    Inventor: Shinichi Kubota
  • Publication number: 20080181273
    Abstract: A disclosed laser diode driving circuit causes a laser diode to emit light by varying a current value of a current source in accordance with a control signal input externally and supplying a current that is the same as or proportional to the current value to the laser diode. The driving circuit includes correction circuitry for generating a reference forward voltage as a reference for the laser diode in accordance with a predetermined driving current for driving the laser diode, generating a forward voltage for the laser diode in accordance with the predetermined driving current, and correcting a current supplied to the laser diode so that the forward voltage becomes the same as the reference forward voltage.
    Type: Application
    Filed: March 19, 2008
    Publication date: July 31, 2008
    Inventor: Shinichi Kubota
  • Patent number: 7369590
    Abstract: A disclosed laser diode driving circuit causes a laser diode to emit light by varying a current value of a current source in accordance with a control signal input externally and supplying a current that is the same as or proportional to the current value to the laser diode. The driving circuit includes correction circuitry for generating a reference forward voltage as a reference for the laser diode in accordance with a predetermined driving current for driving the laser diode, generating a forward voltage for the laser diode in accordance with the predetermined driving current, and correcting a current supplied to the laser diode so that the forward voltage becomes the same as the reference forward voltage.
    Type: Grant
    Filed: September 23, 2004
    Date of Patent: May 6, 2008
    Assignee: Ricoh Company, Ltd.
    Inventor: Shinichi Kubota
  • Patent number: 7336687
    Abstract: A laser diode driving circuit capable of providing a suitable output current to a laser diode is disclosed. The laser diode driving circuit includes a current supply, a first pseudo laser diode, a second pseudo laser diode, and an output current mirror circuit. An input current provided by the current supply is output through the output current mirror circuit to the laser diode. By making the characteristic of each of the first and second pseudo laser diodes substantially equal to the characteristic of the laser diode, the non-linearity between the input current and the output current is compensated.
    Type: Grant
    Filed: March 1, 2005
    Date of Patent: February 26, 2008
    Assignee: Ricoh Company, Ltd.
    Inventor: Shinichi Kubota
  • Patent number: 6984840
    Abstract: An optical semiconductor device includes an SiC substrate having an n-type conductivity, and an AlGaN buffer layer having an n-type conductivity formed on the SiC substrate with a composition represented as AlxGa1-xN, wherein the AlGaN buffer layer has a carrier density in the range between 3×1018–1×1020 cm?3, and the compositional parameter x is larger than 0 but smaller than 0.4 (0<x<0.4).
    Type: Grant
    Filed: May 18, 1999
    Date of Patent: January 10, 2006
    Assignee: Fujitsu Limited
    Inventors: Akito Kuramata, Shinichi Kubota, Kazuhiko Horino, Reiko Soejima
  • Publication number: 20050195869
    Abstract: A laser diode driving circuit capable of providing a suitable output current to a laser diode is disclosed. The laser diode driving circuit includes a current supply, a first pseudo laser diode, a second pseudo laser diode, and an output current mirror circuit. An input current provided by the current supply is output through the output current mirror circuit to the laser diode. By making the characteristic of each of the first and second pseudo laser diodes substantially equal to the characteristic of the laser diode, the non-linearity between the input current and the output current is compensated.
    Type: Application
    Filed: March 1, 2005
    Publication date: September 8, 2005
    Inventor: Shinichi Kubota
  • Publication number: 20050094690
    Abstract: A disclosed laser diode driving circuit causes a laser diode to emit light by varying a current value of a current source in accordance with a control signal input externally and supplying a current that is the same as or proportional to the current value to the laser diode. The driving circuit includes correction circuitry for generating a reference forward voltage as a reference for the laser diode in accordance with a predetermined driving current for driving the laser diode, generating a forward voltage for the laser diode in accordance with the predetermined driving current, and correcting a current supplied to the laser diode so that the forward voltage becomes the same as the reference forward voltage.
    Type: Application
    Filed: September 23, 2004
    Publication date: May 5, 2005
    Inventor: Shinichi Kubota
  • Patent number: 6661822
    Abstract: A lateral mode controlling layer made of AlN having a thickness of more than 0 nm but less than 300 nm is formed in at least one cladding layer of an n-type cladding layer and a p-type cladding layer or formed between the at least one cladding layer and the active layer. Also, a mask layer is formed on a substrate, then an AlN layer is formed to cover it, and then the AlN layer is lifted off by using a solution for etching. the mask layer. Accordingly, lateral mode control of the group III-V compound semiconductor laser can be facilitated, the aspect ratio of the beam shape can be improved, and the damage caused by the Al layer growth and the patterning can be reduced.
    Type: Grant
    Filed: April 5, 2000
    Date of Patent: December 9, 2003
    Assignee: Fujitsu Limited
    Inventors: Shinichi Kubota, Kazuhiko Horino, Akito Kuramata
  • Patent number: 6555403
    Abstract: There are provided a semiconductor laser, a semiconductor light emitting device, and methods of manufacturing the same wherein a threshold current density in a short wavelength semiconductor laser using a nitride compound semiconductor can be reduced. An active layer is composed of a single gain layer having a thickness of more than 3 nm, and optical guiding layers are provided between the active layer and cladding layers respectively.
    Type: Grant
    Filed: July 30, 1998
    Date of Patent: April 29, 2003
    Assignee: Fujitsu Limited
    Inventors: Kay Domen, Shinichi Kubota, Akito Kuramata, Reiko Soejima
  • Publication number: 20020110945
    Abstract: An optical semiconductor device includes an SiC substrate having an n-type conductivity, and an AlGaN buffer layer having an n-type conductivity formed on the SiC substrate with a composition represented as AlxGa1−xN, wherein the AlGaN buffer layer has a carrier density in the range between 3×1018−1×1012cm−3, and the compositional parameter x is larger than 0 but smaller than 0.4 (0<x<0.4).
    Type: Application
    Filed: May 18, 1999
    Publication date: August 15, 2002
    Applicant: FUJITSU LIMITED OF KAWASAKI, JAPAN
    Inventors: AKITO KURAMATA, SHINICHI KUBOTA, KAZUHIKO HORINO, REIKO SOEJIMA
  • Patent number: 5815025
    Abstract: An intensity controlling circuit device can correct variation in intensity of light beams, due to tolerance occurred in each of a plurality of LED-array chips, emitted by LEDs provided in each of the LED-array chips. The intensity controlling circuit device is connected to at least one LED-array chip comprising a plurality of LEDs and slave transistors corresponding to each of the LEDs. The intensity controlling circuit device comprises an intensity controlling circuit connected to the respective LED-array chip. The intensity controlling circuit comprises a first transistor provided between a power source and a constant current generating unit so as to supply a current to the LED-array chip, and an intensity adjusting unit having a second transistor connected to the first transistor in parallel and a controlling unit for controlling the on/off state of the second transistor.
    Type: Grant
    Filed: October 20, 1995
    Date of Patent: September 29, 1998
    Assignee: Ricoh Company, Ltd.
    Inventor: Shinichi Kubota
  • Patent number: 5805627
    Abstract: Embedded layers having a high resistance or an inverse conductivity with respect to a ridge structure are formed on either side of a ridge structure which is formed to correspond to an light emission region of a laser diode. The embedded layers confines a current in the ridge structure and moderates light-confinement performance in the ridge structure at an emitting end of the laser diode.
    Type: Grant
    Filed: October 23, 1995
    Date of Patent: September 8, 1998
    Assignee: Fujitsu Limited
    Inventors: Shinichi Kubota, Haruhisa Soda
  • Patent number: 5686883
    Abstract: A vehicle anti-theft system in which, only when the ID signal is obtained from a right ignition key and when the vehicle anti-theft function is halted by the failure of an anti-theft circuit or theft detection unit itself, the start-up of the engine is permitted. The system comprises a unit for generating a start-up enable signal in response to a verification signal representing a right ID signal, and an engine control unit for performing the start-up control of the engine in response to the start-up enable signal and disabling the engine in response to a theft signal. The start-up enable signal generating unit generates a start-up enable signal in response to the fault signal. A dummy line for detecting a breakage is wired along various signal lines wired on the substrate of an immobilizer, which, if intentionally broken by an ill-intentioned third party, could cause a fault signal similar to that for the failure of the immobilizer to be outputted from a determination signal output terminal.
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: November 11, 1997
    Assignee: Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Eiji Mutoh, Shinichi Kubota, Susumu Maeda, Suguru Asakura, Akira Nagai
  • Patent number: 5641998
    Abstract: An engine control device exhibiting a unique vehicle anti-theft function which prevents a vehicle from being stolen when equipped physically on a vehicle in place of an engine control device with vehicle anti-theft function. The antenna unit detection circuit in an ECU 30b' instructs engine ECU 16 to inhibit engine control when it is detected that an antenna unit 29 which should not originally be connected to ECU 30b' has been connected to ECU 30b', that is, the ECU 30b' without anti-theft function is attached to a vehicle to which an ECU 30a with anti-theft function is to be attached.
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: June 24, 1997
    Assignee: Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Susumu Maeda, Eiji Mutoh, Shinichi Kubota
  • Patent number: 5638270
    Abstract: An engine control system in which control of an engine can be performed after there has been a momentary power disconnection of a power supply, such as the vechicle battery, from an engine control unit of an electronic circuit which executes an anti-theft function. A power supply detecting circuit detect a connecting of the power supply to the engine control unit. A further circuit determines on the basis of the vehicle speed and the RPM whether or not the vehicle is running. When a connecting of the power supply to the engine control unit is dectected, a determination is made whether or not the power supply connecting has occured after a preceding momentary power disconnection if the further circuit determines that the vehicle is running. The anit-theft function of the electronic circuit is disable when it is determined that there has been a preceding momentary power desconnection.
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: June 10, 1997
    Assignee: Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Susumu Maeda, Eiji Mutoh, Shinichi Kubota, Takashi Kawachi
  • Patent number: 5633624
    Abstract: Ribs 9'a to 9'd provided in a connector 50b on the terminal device side are coincident with grooves 8'a to 8'd provided in a connector 40b on the ECU 30b side, but are not coincident with grooves 8a to 8d provided in a connector 40a in position, size and shape. Even if the connector 40b of the ECU 30b without the immobilizer CPU 13 is attempted to be engaged the connector 50a which should originally be connected to the ECU 30a with the immobilizer CPU 13, it cannot be engaged or right electrical connections between input/output terminals in the ECU 30a and corresponding terminal devices cannot be achieved. Accordingly, the theft of the vehicle by replacing the ECU 30a with the ECU 30b is prevented.
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: May 27, 1997
    Assignee: Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Susumu Maeda, Eiji Mutoh, Shinichi Kubota
  • Patent number: 5631501
    Abstract: A method and apparatus for vehicular data processing which enable quick, efficient input of first serial data entered from an external device and comparison of the first and second data with prestored second serial data. First serial data is repeatedly sent out asynchronously. The prestored second serial data is sent out in response to a request. Storing of the second serial data is performed until distinctive leading pulse of the first serial data is detected, at which time storing of the second serial data is suspended to permit storing of the first serial data in an interrupt mode.
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: May 20, 1997
    Assignee: Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Shinichi Kubota, Eiji Mutoh, Susumu Maeda
  • Patent number: 5621381
    Abstract: A vehicle anti-theft engine control device enables engine control to be continued even if the data in the memory, wherein an ID code checking result has been stored, incurs "bit change" due to noise or the like, causing the data to change into data prohibiting engine control. The control device comprises a plurality of engine start enable flags for storing information on the enable/disable state of the engine control, enable flag registering means for registering "1" (enable) in all flags in response to a start permit signal, re-registering means for registering again, when "1" has been registered in at least one of the flags, "1" (enable) in all other enable flags, and control enabling means for enabling the engine control in accordance with the registered/reregistered enable flag.
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: April 15, 1997
    Assignee: Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Takashi Kawachi, Kenji Iwasaki, Masanori Matsuura, Satoru Ohtsuka, Shinichi Kubota, Eiji Mutoh
  • Patent number: 5610574
    Abstract: A data processing apparatus for a vehicle which permits accurate and reliable registration of a key ID code in a vehicle. ID code detecting means detects an ID code received in succession from outside. The ID code detected previously is registered in the memory 132 for previous ID code; the ID code detected this time is registered in the memory 133 for the present ID code. First comparing means compares the previous ID code with the present ID code and if the two ID codes match, then the ID code is registered as a reference ID code in an EEPROM. Second comparing means compares the present ID code with the reference ID code and if the two ID codes match, then it issues an engine control enable (OK) signal to an engine CPU.
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: March 11, 1997
    Assignee: Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Eiji Mutoh, Shinichi Kubota, Susumu Maeda
  • Patent number: 5606306
    Abstract: A vehicle anti-theft engine control device which is also applicable to an engine control unit without a vehicle anti-theft function and which can be used in combination with any type of vehicle anti-theft function as necessary. The engine control device for vehicle anti-theft function comprises an engine control unit for controlling the start of the engine in response to a start permit signal; an anti-theft function provision determining means for determining whether the engine is equipped with a vehicle anti-theft device or not and for issuing a signal indicating the presence or absence of the anti-theft function; a theft detector means for receiving a signal indicating that legitimate starting operation is being performed and for issuing a validation signal; and means for issuing a start permit signal in response to the validation signal received from the theft detector means or the signal indicating the absence of the anti-theft function.
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: February 25, 1997
    Assignee: Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Eiji Mutoh, Susumu Maeda, Shinichi Kubota