Title:
点灯回路および車両用灯具
Document Type and Number:
Japanese Patent JP7117184
Kind Code:
B2
Abstract:
This lighting circuit comprises a current source and a thermal sensing element. The thermal sensing element senses the temperature of a semiconductor light source. The current source generates a drive current that shows a positive correlation with the temperature when the temperature is in a normal range and that shows a negative correlation with the temperature when the temperature falls within a temperature range higher than the normal range.
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Inventors:
Tomoyuki Ichikawa
Masato Harasaki
Masato Harasaki
Application Number:
JP2018135583A
Publication Date:
August 12, 2022
Filing Date:
July 19, 2018
Export Citation:
Assignee:
Koito Manufacturing Co., Ltd.
International Classes:
H05B45/18; B60Q1/30; B60Q1/44
Domestic Patent References:
| JP2010118295A | ||||
| JP2017162664A | ||||
| JP2015022879A |
Attorney, Agent or Firm:
Morishita Kenki
Yusuke Murata
Tomoyuki Miki
Yusuke Murata
Tomoyuki Miki