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公开(公告)号：US11729875B2
公开(公告)日：2023-08-15
申请号：US16925442
申请日：2020-07-10
Applicant: KOITO MANUFACTURING CO., LTD.
Inventor： Satoshi Kikuchi , Kentarou Murakami , Toshiyuki Tsuchiya , Takao Muramatsu , Shohei Yanagizu , Tomoyuki Ichikawa
CPC classification number: H05B44/00 , B60Q1/1423 , B60Q1/245 , F21S41/143 , F21S41/65 , H05B45/30 , H05B47/20
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.
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公开(公告)号：US12187183B2
公开(公告)日：2025-01-07
申请号：US18063307
申请日：2022-12-08
Applicant: KOITO MANUFACTURING CO., LTD.
Inventor： Yu Ota , Masashi Kato , Shohei Yanagizu , Satoshi Kikuchi
IPC: B60Q1/076 , B60Q1/14 , B60Q1/16 , F21S41/663 , F21V23/00 , F21Y115/10 , H01L27/15
Abstract: An array-type light-emitting device includes multiple pixel circuits electrically coupled in parallel and spatially arranged in a matrix. A power supply circuit supplies electric power to the array-type light-emitting device. A DC/DC converter has an output coupled to a power supply terminal of the array-type light-emitting device via a power supply line. A power supply control circuit sets a target value that corresponds to a light distribution pattern, and controls the DC/DC converter such that the control target voltage approaches the target value.
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公开(公告)号：US20240334580A1
公开(公告)日：2024-10-03
申请号：US18579622
申请日：2022-06-22
Applicant: KOITO MANUFACTURING CO., LTD.
Inventor： Shohei Yanagizu , Yu Ota
IPC: H05B47/28 , H05B45/18 , H05B45/305 , H05B45/3725 , H05B45/46 , H05B47/165
CPC classification number: H05B47/28 , H05B45/18 , H05B45/305 , H05B45/3725 , H05B45/46 , H05B47/165
Abstract: A lamp includes a power supply circuit, a light source, a control unit, a first temperature detection circuit, and a second temperature detection circuit. The power supply circuit is provided on a first substrate and configured to generate a predetermined voltage based on a power supply voltage. The light source, which is provided on a second substrate, includes a plurality of light-emitting elements and an adjustment unit configured to adjust a drive current flowing through each of the plurality of light-emitting elements, and uses the predetermined voltage as a power supply. The control unit is provided on a third substrate and configured to control the adjustment unit. The first temperature detection circuit is provided on the first substrate and configured to detect a temperature. The second temperature detection circuit is provided on the second substrate and configured to detect a temperature. The control unit is configured to control the adjustment unit based on a detection result having a higher temperature of detection results of the first and second temperature detection circuits and a signal indicating a turn-on condition of the plurality of light-emitting elements.
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公开(公告)号：US20180054870A1
公开(公告)日：2018-02-22
申请号：US15678764
申请日：2017-08-16
Applicant: KOITO MANUFACTURING CO., LTD.
Inventor： Shohei Yanagizu , Masayasu Ito , Takao Muramatsu
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.
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公开(公告)号：US12139062B2
公开(公告)日：2024-11-12
申请号：US18058385
申请日：2022-11-23
Applicant: KOITO MANUFACTURING CO., LTD.
Inventor： Yu Ota , Masashi Kato , Shohei Yanagizu , Satoshi Kikuchi
Abstract: A variable light distribution light source includes an array-type light-emitting device. The array-type light-emitting device includes a power supply terminal and multiple pixel circuits electrically coupled and spatially arranged in a matrix. A power supply circuit includes a power supply unit that supplies electric power to the array-type light-emitting device. An output of a DC/DC converter is coupled to the power supply terminal VDD of the array-type light-emitting device via an output terminal. A voltage setting circuit generates a controllable correction voltage. A feedback circuit generates a feedback voltage based on the correction voltage and the control target voltage that corresponds to the output voltage of the DC/DC converter, and supplies the feedback voltage to a feedback pin of a converter controller.
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公开(公告)号：US20230093633A1
公开(公告)日：2023-03-23
申请号：US18058385
申请日：2022-11-23
Applicant: KOITO MANUFACTURING CO., LTD.
Inventor： Yu OTA , Masashi Kato , Shohei Yanagizu , Satoshi Kikuchi
Abstract: A variable light distribution light source includes an array-type light-emitting device. The array-type light-emitting device includes a power supply terminal and multiple pixel circuits electrically coupled and spatially arranged in a matrix. A power supply circuit includes a power supply unit that supplies electric power to the array-type light-emitting device. An output of a DC/DC converter is coupled to the power supply terminal VDD of the array-type light-emitting device via an output terminal. A voltage setting circuit generates a controllable correction voltage. A feedback circuit generates a feedback voltage based on the correction voltage and the control target voltage that corresponds to the output voltage of the DC/DC converter, and supplies the feedback voltage to a feedback pin of a converter controller.
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公开(公告)号：US10426012B2
公开(公告)日：2019-09-24
申请号：US15678764
申请日：2017-08-16
Applicant: KOITO MANUFACTURING CO., LTD.
Inventor： Shohei Yanagizu , Masayasu Ito , Takao Muramatsu
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.
