Patents by Inventor Takao Muramatsu

Takao Muramatsu 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: 11097653
    Abstract: A vehicle lamp system includes an imaging unit that takes an image ahead of a host vehicle, a luminance analyzer that detects luminance of each of areas ahead of the host vehicle, a target analyzer that detects objects ahead of the host vehicle, a tracking unit that determines a specific object from the detected objects and detects displacement of the specific object based on a detection result of the luminance; a setting unit that sets, based on the detection result of the luminance and a detection result of the displacement, an illuminance value for each area, which includes a specific illuminance for a specific area determined according to a position where the specific target is present, and a controller that controls the light source the illuminance of the light to be radiated from a light source to each area based on the illuminance values set by the setting unit.
    Type: Grant
    Filed: January 10, 2018
    Date of Patent: August 24, 2021
    Assignee: KOITO MANUFACTURING CO., LTD.
    Inventors: Yoshinori Shibata, Takao Muramatsu
  • Patent number: 11001194
    Abstract: A vehicular lamp system includes: an imager; a luminance analyzer that detects a luminance of each of multiple individual regions; an illuminance setting unit that determines an illuminance value of light emitted to each individual region, based on a detection result from the luminance analyzer; a light source unit; and a light source controller that controls the light source unit. The illuminance setting unit uses different functions to determine the illuminance value for an individual region that falls within a certain first luminance range, and the illuminance value for an individual region that falls within a certain second luminance range.
    Type: Grant
    Filed: December 27, 2019
    Date of Patent: May 11, 2021
    Assignee: KOITO MANUFACTURING CO., LTD.
    Inventors: Yoshinori Shibata, Takao Muramatsu
  • Patent number: 10993297
    Abstract: A lighting circuit controls lighting/extinguishing of a light source. A driving circuit generates a driving current which is to be supplied to the light source. A clamp circuit clamps a voltage between both ends of the light source to a clamp level in a period in which the light source is to be turned off. The clamp level is defined to be higher than zero and lower than a critical pressure when the light source is turned on/off.
    Type: Grant
    Filed: December 6, 2017
    Date of Patent: April 27, 2021
    Assignee: KOITO MANUFACTURING CO., LTD.
    Inventors: Satoshi Kikuchi, Takao Muramatsu
  • Publication number: 20210031675
    Abstract: A vehicle lamp system includes an imaging unit that takes an image ahead of a host vehicle, a luminance analyzer that detects luminance of each of areas ahead of the host vehicle, a target analyzer that detects objects ahead of the host vehicle, a tracking unit that determines a specific object from the detected objects and detects displacement of the specific object based on a detection result of the luminance; a setting unit that sets, based on the detection result of the luminance and a detection result of the displacement, an illuminance value for each area, which includes a specific illuminance for a specific area determined according to a position where the specific target is present, and a controller that controls the light source the illuminance of the light to be radiated from a light source to each area based on the illuminance values set by the setting unit.
    Type: Application
    Filed: January 10, 2018
    Publication date: February 4, 2021
    Applicant: KOITO MANUFACTURING CO., LTD.
    Inventors: Yoshinori Shibata, Takao Muramatsu
  • Publication number: 20200339034
    Abstract: A scanning light source includes a light source, and scans the output light of the light source ahead of a lamp. A control apparatus controls the lighting on/off state of the semiconductor light source in synchronization with the scanning operation of the scanning light source. The control apparatus judges the presence or absence of an abnormal state with at least one from among (i) a timing immediately before switching from a lighting-on state to a lighting-off state and (ii) a timing immediately before switching from a lighting-off state to a lighting-on state as a judgment timing.
    Type: Application
    Filed: July 10, 2020
    Publication date: October 29, 2020
    Applicant: KOITO MANUFACTURING CO., LTD.
    Inventors: Satoshi KIKUCHI, Kentarou MURAKAMI, Toshiyuki TSUCHIYA, Takao MURAMATSU, Shohei YANAGIZU, Tomoyuki ICHIKAWA
  • Publication number: 20200333182
    Abstract: A vehicle lamp includes: a first light source configured to irradiate visible light; a second light source configured to emit infrared light; a rotating reflector configured to be rotated while reflecting the visible light and the infrared light, and scan the visible light and the infrared light along a horizontal direction on a virtual vertical screen; a light receiving unit configured to receive the infrared light emitted from the second light source and reflected by a target object; and a controller configured to control an irradiation area of the visible light based on the infrared light received by the receiving unit. When determined that there is an abnormality in at least one of the second light source or the light receiving unit, the controller is configured to control the irradiation area based on the surrounding information of the vehicle obtained from outside the vehicle lamp.
    Type: Application
    Filed: April 7, 2020
    Publication date: October 22, 2020
    Inventors: Fahin Syed Ahmed, Takao Muramatsu, Hitoshi Gotoh
  • Patent number: 10807516
    Abstract: A lighting circuit drives a light source including N (N represents an integer of 2 or more) multiple light-emitting elements coupled in series. A bypass switch circuit includes N multiple bypass switches, each coupled in parallel to a corresponding light-emitting element. A constant current driving circuit supplies a driving current stabilized to a target current to the light source. A light distribution controller controls the bypass switch circuit. For a given light distribution pattern, the duty ratio Di(%) is determined for each of the N multiple light-emitting elements. Multiple light-emitting elements are formed as control units having a sum total of duty ratios that is less than 100%. The light distribution controller controls the multiple bypass switches such that the multiple light-emitting elements included in the same control unit are not turned on at the same time.
    Type: Grant
    Filed: March 8, 2019
    Date of Patent: October 20, 2020
    Assignee: KOITO MANUFACTURING CO., LTD.
    Inventors: Yuta Maruyama, Kentarou Murakami, Takao Muramatsu
  • Publication number: 20200195831
    Abstract: A left infrared camera module includes a left infrared irradiation unit configured to emit infrared toward a left side region of a vehicle, a left infrared camera configured to acquire infrared image data indicative of a surrounding environment in the left side region of the vehicle, and a control unit configured to control an operation of the left infrared irradiation unit. The control unit is configured to change an intensity of the infrared to be emitted from the left infrared irradiation unit, in correspondence to a condition relating to a traveling state of the vehicle. The left infrared camera module configured as described above can detect the surrounding environment in the side region of the vehicle without causing an uncomfortable feeling to other vehicle, a pedestrian and the like.
    Type: Application
    Filed: December 13, 2019
    Publication date: June 18, 2020
    Applicant: KOITO MANUFACTURING CO., LTD.
    Inventors: Takao Muramatsu, Shigeyuki Watanabe, Masaaki Sato, Akinobu Kubota
  • Patent number: 10676017
    Abstract: A vehicular lighting device includes a scanning light source. The scanning light source includes a semiconductor light source, and scans the output light of the semiconductor light source in a forward region ahead of the lighting device. A lighting circuit changes the light amount of the semiconductor light source in multiple levels in synchronization with the scanning of the scanning light source.
    Type: Grant
    Filed: October 15, 2017
    Date of Patent: June 9, 2020
    Assignee: KOITO MANUFACTURING CO., LTD.
    Inventors: Kentarou Murakami, Hitoshi Takeda, Takao Muramatsu
  • Patent number: 10661701
    Abstract: A blade receives light emitted from a light source and repeats a predetermined periodic motion to scan the front of a vehicle with reflected light of the emitted light. A position detector generates a position detection signal S4 indicating a timing at which a predetermined reference point of the blade passes a predetermined position. Based on the position detection signal S4, a period calculator calculates a period Tp of the periodic motion of the blade. A light intensity calculator receives light-distribution-pattern information S3 to be formed in front of the vehicle and calculates light intensity to be generated by the light source at each time based on the position detection signal S4 and the period Tp. A driver turns on a semiconductor light source so as to obtain the light intensity calculated by the light intensity calculator at each time.
    Type: Grant
    Filed: June 22, 2017
    Date of Patent: May 26, 2020
    Assignee: KOITO MANUFACTURING CO., LTD.
    Inventors: Takeshi Toda, Kentarou Murakami, Masayasu Ito, Takao Muramatsu, Hidetada Tanaka, Satoshi Yamamura
  • Publication number: 20200139879
    Abstract: A vehicular lamp system includes: an imager; a luminance analyzer that detects a luminance of each of multiple individual regions; an illuminance setting unit that determines an illuminance value of light emitted to each individual region, based on a detection result from the luminance analyzer; a light source unit; and a light source controller that controls the light source unit. The illuminance setting unit uses different functions to determine the illuminance value for an individual region that falls within a certain first luminance range, and the illuminance value for an individual region that falls within a certain second luminance range.
    Type: Application
    Filed: December 27, 2019
    Publication date: May 7, 2020
    Applicant: KOITO MANUFACTURING CO., LTD.
    Inventors: Yoshinori SHIBATA, Takao MURAMATSU
  • Patent number: 10641454
    Abstract: There is provided a vehicle lamp includes a first light source part, a second light source part, a scanning optical system which scans an emission beam from the first light source part by repeating a periodical motion, and a lighting circuit which independently drives the first light source part and the second light source part. A scanning beam scanned by the scanning optical system is projected to form a first pattern, and an emission beam from the second light source part is projected to form a second pattern.
    Type: Grant
    Filed: June 22, 2018
    Date of Patent: May 5, 2020
    Assignee: KOITO MANUFACTURING CO., LTD.
    Inventors: Satoshi Kikuchi, Tomoyuki Ichikawa, Takao Muramatsu
  • Patent number: 10609774
    Abstract: A lighting circuit includes a voltage converter configured to receive a DC voltage to perform voltage conversion and supply a drive current to a light source unit including a light emitting element, a bypass switch configured to form a bypass path through which the drive current bypasses the light emitting element, and a controller configured to control the voltage converter and the bypass switch. The light source unit includes a plurality of light emitting elements connected in series. The bypass path includes at least one bypass switch which are connected in parallel with at least one of the light emitting elements. When turning on the light emitting element of the light source unit, the controller controls the voltage conversion to start in a state where the bypass switch is turned on, and then, turns off the bypass switch to turn on the light emitting element.
    Type: Grant
    Filed: July 1, 2016
    Date of Patent: March 31, 2020
    Assignee: KIOTO MANUFACTURING CO., LTD.
    Inventors: Toshiyuki Tsuchiya, Takao Muramatsu, Takeshi Toda
  • Patent number: 10426012
    Abstract: There is provided a lighting circuit configured to drive a light emitting unit including a first light source and a second light source connected in series. The lighting circuit includes a first pin connected to one end of the first light source, a second pin connected to a connection node of the first light source and the second light source, a third pin connected to one end of the second light source, a drive circuit configured to supply a drive current to the light emitting unit, a bypass switch provided between the second pin and the third pin, a first resistor provided in parallel with the bypass switch between the second pin and the third pin, and an abnormality detection circuit configured to detect abnormality based on a detection voltage generated between the second pin and the third pin when an ON signal is applied to the bypass switch.
    Type: Grant
    Filed: August 16, 2017
    Date of Patent: September 24, 2019
    Assignee: KOITO MANUFACTURING CO., LTD.
    Inventors: Shohei Yanagizu, Masayasu Ito, Takao Muramatsu
  • Publication number: 20190202344
    Abstract: A lighting circuit drives a light source including N (N represents an integer of 2 or more) multiple light-emitting elements coupled in series. A bypass switch circuit includes N multiple bypass switches, each coupled in parallel to a corresponding light-emitting element. A constant current driving circuit supplies a driving current stabilized to a target current to the light source. A light distribution controller controls the bypass switch circuit. For a given light distribution pattern, the duty ratio Di(%) is determined for each of the N multiple light-emitting elements. Multiple light-emitting elements are formed as control units having a sum total of duty ratios that is less than 100%. The light distribution controller controls the multiple bypass switches such that the multiple light-emitting elements included in the same control unit are not turned on at the same time.
    Type: Application
    Filed: March 8, 2019
    Publication date: July 4, 2019
    Applicant: Koito Manufacturing Co., Ltd.
    Inventors: Yuta MARUYAMA, Kentarou MURAKAMI, Takao MURAMATSU
  • Patent number: 10246004
    Abstract: A vehicle headlight control apparatus controls headlights of a vehicle including LEDs. The vehicle headlight control apparatus includes: drivers and each of which gradually changes a luminance of the LEDs between a predetermined on state and a predetermined off state over a switching time period; and a lamp ECU that determines the switching time period in a changeable manner.
    Type: Grant
    Filed: May 24, 2016
    Date of Patent: April 2, 2019
    Assignees: DENSO CORPORATION, TOYOTA JIDOSHA KABUSHIKI KAISHA, KOITO MANUFACTURING CO., LTD.
    Inventors: Ryu Mizuno, Shinichi Futamura, Tatsuya Takagaki, Takatoshi Nakagawa, Kiyotaka Mochizuki, Takao Muramatsu
  • Publication number: 20190008010
    Abstract: A lighting circuit includes a voltage converter configured to receive a DC voltage to perform voltage conversion and supply a drive current to a light source unit including a light emitting element, a bypass switch configured to form a bypass path through which the drive current bypasses the light emitting element, and a controller configured to control the voltage converter and the bypass switch. The light source unit includes a plurality of light emitting elements connected in series. The bypass path includes at least one bypass switch which are connected in parallel with at least one of the light emitting elements. When turning on the light emitting element of the light source unit, the controller controls the voltage conversion to start in a state where the bypass switch is turned on, and then, turns off the bypass switch to turn on the light emitting element.
    Type: Application
    Filed: July 1, 2016
    Publication date: January 3, 2019
    Applicants: KOITO MANUFACTURING CO., LTD., KOITO MANUFACTURING CO., LTD.
    Inventors: Toshiyuki Tsuchiya, Takao Muramatsu, Takeshi Toda
  • Publication number: 20180372295
    Abstract: There is provided a vehicle lamp includes a first light source part, a second light source part, a scanning optical system which scans an emission beam from the first light source part by repeating a periodical motion, and a lighting circuit which independently drives the first light source part and the second light source part. A scanning beam scanned by the scanning optical system is projected to form a first pattern, and an emission beam from the second light source part is projected to form a second pattern.
    Type: Application
    Filed: June 22, 2018
    Publication date: December 27, 2018
    Applicant: KOITO MANUFACTURING CO., LTD.
    Inventors: Satoshi Kikuchi, Tomoyuki Ichikawa, Takao Muramatsu
  • Patent number: 10156334
    Abstract: A vehicular lamp is provided with a plurality of light emitting units and configured to independently control ON/OFF of the light emitting units. The plurality of light emitting units are disposed so that a desired light distribution is formed by overlapping scanning of illumination spots formed on a virtual screen by emitted lights thereof. The plurality of light emitting units are divided in a plurality of channels, the same direct drive current is supplied to at least one light emitting unit of all of the light emitting units included in the same channel, and the direct drive current is constantly maintained during a scanning period. The current amount of drive current for each channel is set in accordance with a light distribution mode, and ON/OFF of each light emitting unit is switched at a predetermined timing determined in accordance with the light distribution mode during a scanning period.
    Type: Grant
    Filed: April 20, 2018
    Date of Patent: December 18, 2018
    Assignee: Koito Manufacturing Co., Ltd.
    Inventors: Satoshi Kikuchi, Kentarou Murakami, Takao Muramatsu
  • Publication number: 20180313508
    Abstract: A vehicular lamp is provided with a plurality of light emitting units and configured to independently control ON/OFF of the light emitting units. The plurality of light emitting units are disposed so that a desired light distribution is formed by overlapping scanning of illumination spots formed on a virtual screen by emitted lights thereof. The plurality of light emitting units are divided in a plurality of channels, the same direct drive current is supplied to at least one light emitting unit of all of the light emitting units included in the same channel, and the direct drive current is constantly maintained during a scanning period. The current amount of drive current for each channel is set in accordance with a light distribution mode, and ON/OFF of each light emitting unit is switched at a predetermined timing determined in accordance with the light distribution mode during a scanning period.
    Type: Application
    Filed: April 20, 2018
    Publication date: November 1, 2018
    Inventors: Satoshi Kikuchi, Kentarou Murakami, Takao Muramatsu