Patents by Inventor Yoichi Kajiwara

Yoichi Kajiwara 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: 20240088786
    Abstract: A driving device includes an output terminal to output a first control signal, and input terminals configured to be connected respectively with a corresponding terminal of light emitting elements driven by a voltage generated based on the first control signal. A constant-current driver is connected to each of the input terminals, and a control portion is configured to generate a pulse signal based on a signal which is input from the input terminals. An open detection portion is connected with each of the input terminals and configured to determine a connection state of the light emitting elements based on a signal that is input into the input terminals. A current set terminal is configured to be connected to a first resistor, and an over voltage protection circuit is configured to be coupled to a potential between a second resistor and a third resistor.
    Type: Application
    Filed: November 20, 2023
    Publication date: March 14, 2024
    Inventors: Shinji Kawata, Yoichi Kajiwara
  • Patent number: 11863068
    Abstract: A driving device comprises a first transistor (B13), a second transistor (B14), and a resistance element. The first transistor (B13) has one terminal receiving a pulsed current and a control terminal connected to the one terminal. The second transistor (B14) has one terminal connected to at least one load, the other terminal connected to a reference potential together with the other terminal of the first transistor (B13), and a control terminal connected to the control terminal of the first transistor (B13). The resistance element is connected between the control terminal of the first transistor (B13) and the other terminal of the first transistor (B13).
    Type: Grant
    Filed: August 24, 2021
    Date of Patent: January 2, 2024
    Assignee: Rohm Co., Ltd.
    Inventors: Shinji Kawata, Yoichi Kajiwara
  • Publication number: 20210391789
    Abstract: A driving device comprises a first transistor (B13), a second transistor (B14), and a resistance element. The first transistor (B13) has one terminal receiving a pulsed current and a control terminal connected to the one terminal. The second transistor (B14) has one terminal connected to at least one load, the other terminal connected to a reference potential together with the other terminal of the first transistor (B13), and a control terminal connected to the control terminal of the first transistor (B13). The resistance element is connected between the control terminal of the first transistor (B13) and the other terminal of the first transistor (B13).
    Type: Application
    Filed: August 24, 2021
    Publication date: December 16, 2021
    Inventors: Shinji Kawata, Yoichi Kajiwara
  • Patent number: 11133744
    Abstract: A driving device comprises a first transistor (B13), a second transistor (B14), and a resistance element. The first transistor (B13) has one terminal receiving a pulsed current and a control terminal connected to the one terminal. The second transistor (B14) has one terminal connected to at least one load, the other terminal connected to a reference potential together with the other terminal of the first transistor (B13), and a control terminal connected to the control terminal of the first transistor (B13). The resistance element is connected between the control terminal of the first transistor (B13) and the other terminal of the first transistor (B13).
    Type: Grant
    Filed: January 22, 2021
    Date of Patent: September 28, 2021
    Assignee: Rohm Co., Ltd.
    Inventors: Shinji Kawata, Yoichi Kajiwara
  • Publication number: 20210152085
    Abstract: A driving device comprises a first transistor (B13), a second transistor (B14), and a resistance element. The first transistor (B13) has one terminal receiving a pulsed current and a control terminal connected to the one terminal. The second transistor (B14) has one terminal connected to at least one load, the other terminal connected to a reference potential together with the other terminal of the first transistor (B13), and a control terminal connected to the control terminal of the first transistor (B13). The resistance element is connected between the control terminal of the first transistor (B13) and the other terminal of the first transistor (B13).
    Type: Application
    Filed: January 22, 2021
    Publication date: May 20, 2021
    Inventors: Shinji Kawata, Yoichi Kajiwara
  • Patent number: 10938303
    Abstract: A driving device comprises a first transistor (B13), a second transistor (B14), and a resistance element. The first transistor (B13) has one terminal receiving a pulsed current and a control terminal connected to the one terminal. The second transistor (B14) has one terminal connected to at least one load, the other terminal connected to a reference potential together with the other terminal of the first transistor (B13), and a control terminal connected to the control terminal of the first transistor (B13). The resistance element is connected between the control terminal of the first transistor (B13) and the other terminal of the first transistor (B13).
    Type: Grant
    Filed: November 9, 2018
    Date of Patent: March 2, 2021
    Assignee: Rohm Co., Ltd.
    Inventors: Shinji Kawata, Yoichi Kajiwara
  • Publication number: 20190097533
    Abstract: A driving device comprises a first transistor (B13), a second transistor (B14), and a resistance element. The first transistor (B13) has one terminal receiving a pulsed current and a control terminal connected to the one terminal. The second transistor (B14) has one terminal connected to at least one load, the other terminal connected to a reference potential together with the other terminal of the first transistor (B13), and a control terminal connected to the control terminal of the first transistor (B13). The resistance element is connected between the control terminal of the first transistor (B13) and the other terminal of the first transistor (B13).
    Type: Application
    Filed: November 9, 2018
    Publication date: March 28, 2019
    Inventors: Shinji Kawata, Yoichi Kajiwara
  • Patent number: 10170983
    Abstract: A driving device comprises a first transistor (B13), a second transistor (B14), and a resistance element. The first transistor (B13) has one terminal receiving a pulsed current and a control terminal connected to the one terminal. The second transistor (B14) has one terminal connected to at least one load, the other terminal connected to a reference potential together with the other terminal of the first transistor (B13), and a control terminal connected to the control terminal of the first transistor (B13). The resistance element is connected between the control terminal of the first transistor (B13) and the other terminal of the first transistor (B13).
    Type: Grant
    Filed: July 6, 2015
    Date of Patent: January 1, 2019
    Assignee: Rohm Co., Ltd.
    Inventors: Shinji Kawata, Yoichi Kajiwara
  • Publication number: 20150311790
    Abstract: A driving device comprises a first transistor (B13), a second transistor (B14), and a resistance element. The first transistor (B13) has one terminal receiving a pulsed current and a control terminal connected to the one terminal. The second transistor (B14) has one terminal connected to at least one load, the other terminal connected to a reference potential together with the other terminal of the first transistor (B13), and a control terminal connected to the control terminal of the first transistor (B13). The resistance element is connected between the control terminal of the first transistor (B13) and the other terminal of the first transistor (B13).
    Type: Application
    Filed: July 6, 2015
    Publication date: October 29, 2015
    Inventors: Shinji Kawata, Yoichi Kajiwara
  • Patent number: 9104215
    Abstract: A driving device comprises a first transistor (B13), a second transistor (B14), and a resistance element. The first transistor (B13) has one terminal receiving a pulsed current and a control terminal connected to the one terminal. The second transistor (B14) has one terminal connected to at least one load, the other terminal connected to a reference potential together with the other terminal of the first transistor (B13), and a control terminal connected to the control terminal of the first transistor (B13). The resistance element is connected between the control terminal of the first transistor (B13) and the other terminal of the first transistor (B13).
    Type: Grant
    Filed: July 2, 2014
    Date of Patent: August 11, 2015
    Assignee: Rohm Co., Ltd.
    Inventors: Shinji Kawata, Yoichi Kajiwara
  • Publication number: 20140333280
    Abstract: A driving device comprises a first transistor (B13), a second transistor (B14), and a resistance element. The first transistor (B13) has one terminal receiving a pulsed current and a control terminal connected to the one terminal. The second transistor (B14) has one terminal connected to at least one load, the other terminal connected to a reference potential together with the other terminal of the first transistor (B13), and a control terminal connected to the control terminal of the first transistor (B13). The resistance element is connected between the control terminal of the first transistor (B13) and the other terminal of the first transistor (B13).
    Type: Application
    Filed: July 2, 2014
    Publication date: November 13, 2014
    Inventors: Shinji Kawata, Yoichi Kajiwara
  • Patent number: 8796956
    Abstract: A driving device comprises a first transistor (B13), a second transistor (B14), and a resistance element. The first transistor (B13) has one terminal receiving a pulsed current and a control terminal connected to the one terminal. The second transistor (B14) has one terminal connected to at least one load, the other terminal connected to a reference potential together with the other terminal of the first transistor (B13), and a control terminal connected to the control terminal of the first transistor (B13). The resistance element is connected between the control terminal of the first transistor (B13) and the other terminal of the first transistor (B13).
    Type: Grant
    Filed: September 17, 2013
    Date of Patent: August 5, 2014
    Assignee: Rohm Co., Ltd.
    Inventors: Shinji Kawata, Yoichi Kajiwara
  • Publication number: 20140015433
    Abstract: A driving device comprises a first transistor (B13), a second transistor (B14), and a resistance element. The first transistor (B13) has one terminal receiving a pulsed current and a control terminal connected to the one terminal. The second transistor (B14) has one terminal connected to at least one load, the other terminal connected to a reference potential together with the other terminal of the first transistor (B13), and a control terminal connected to the control terminal of the first transistor (B13). The resistance element is connected between the control terminal of the first transistor (B13) and the other terminal of the first transistor (B13).
    Type: Application
    Filed: September 17, 2013
    Publication date: January 16, 2014
    Applicant: Rohm Co., Ltd.
    Inventors: Shinji Kawata, Yoichi Kajiwara
  • Patent number: 8558479
    Abstract: A driving device comprises a first transistor (B13), a second transistor (B14), and a resistance element. The first transistor (B13) has one terminal receiving a pulsed current and a control terminal connected to the one terminal. The second transistor (B14) has one terminal connected to at least one load, the other terminal connected to a reference potential together with the other terminal of the first transistor (B13), and a control terminal connected to the control terminal of the first transistor (B13). The resistance element is connected between the control terminal of the first transistor (B13) and the other terminal of the first transistor (B13).
    Type: Grant
    Filed: August 20, 2012
    Date of Patent: October 15, 2013
    Assignee: Rohm Co., Ltd.
    Inventors: Shinji Kawata, Yoichi Kajiwara
  • Publication number: 20130069554
    Abstract: A driving device comprises a first transistor (B13), a second transistor (B14), and a resistance element. The first transistor (B13) has one terminal receiving a pulsed current and a control terminal connected to the one terminal. The second transistor (B14) has one terminal connected to at least one load, the other terminal connected to a reference potential together with the other terminal of the first transistor (B13), and a control terminal connected to the control terminal of the first transistor (B13). The resistance element is connected between the control terminal of the first transistor (B13) and the other terminal of the first transistor (B13).
    Type: Application
    Filed: August 20, 2012
    Publication date: March 21, 2013
    Applicant: ROHM CO., LTD.
    Inventors: Shinji Kawata, Yoichi Kajiwara
  • Patent number: 8269425
    Abstract: A driving device comprises a first transistor (B13), a second transistor (B14), and a resistance element. The first transistor (B13) has one terminal receiving a pulsed current and a control terminal connected to the one terminal. The second transistor (B14) has one terminal connected to at least one load, the other terminal connected to a reference potential together with the other terminal of the first transistor (B13), and a control terminal connected to the control terminal of the first transistor (B13). The resistance element is connected between the control terminal of the first transistor (B13) and the other terminal of the first transistor (B13).
    Type: Grant
    Filed: August 8, 2008
    Date of Patent: September 18, 2012
    Assignee: Rohm Co., Ltd.
    Inventors: Shinji Kawata, Yoichi Kajiwara
  • Publication number: 20100201283
    Abstract: A driving device comprises a first transistor (B13), a second transistor (B14), and a resistance element. The first transistor (B13) has one terminal receiving a pulsed current and a control terminal connected to the one terminal. The second transistor (B14) has one terminal connected to at least one load, the other terminal connected to a reference potential together with the other terminal of the first transistor (B13), and a control terminal connected to the control terminal of the first transistor (B13). The resistance element is connected between the control terminal of the first transistor (B13) and the other terminal of the first transistor (B13).
    Type: Application
    Filed: August 8, 2008
    Publication date: August 12, 2010
    Applicant: Rohm Co., Ltd.
    Inventors: Shinji Kawata, Yoichi Kajiwara
  • Publication number: 20070064370
    Abstract: A semiconductor integrated circuit device of the present invention is provided with: first and second external terminals, each of which receives a corresponding one of two different potentials applied thereto; first and second switches that are connected in series between the first and second external terminals and connected together at a node from which an output signal is extracted; a heat generation detector portion for detecting a monitored temperature; and a drive circuit for performing on/off control of the first and second switches. When the monitored temperature reaches a first threshold temperature, both the first and second switches are turned off, and, when the monitored temperature reaches a second threshold temperature that is higher than the first threshold temperature, the first and second external terminals are short-circuited so as to operate an overcurrent protection element connected externally.
    Type: Application
    Filed: September 14, 2006
    Publication date: March 22, 2007
    Inventor: Yoichi Kajiwara