专利检索 ap:("KOITO MANUFACTURING CO., LTD.") AND inv:"MATSUMOTO, Yutaka" 第 1 页

1.

发明公开
LIGHT SOURCE MODULE AND LIGHTING CIRCUIT 审中-公开

公开(公告)号：EP4122766A1

公开(公告)日：2023-01-25

申请号：EP21771555.6

申请日：2021-03-10

申请人： KOITO MANUFACTURING CO., LTD.

发明人： ICHIKAWA, Tomoyuki , OZAWA, Atsushi , MIWA, Mariko , MATSUMOTO, Yutaka

IPC分类号： B60Q1/44 , H01L33/00 , H05B45/48 , H05B45/54

摘要： There is provided a rear sign lamp capable of enhancing safety. An LED string (502) includes four LEDs (504_1 to 504_4) connected in series. An LED driver circuit (610) receives a battery voltage (VIN) and supplies a drive current (ILED) stabilized at a target current (IREF) to the LED string (502). A bypass circuit (620) is provided in parallel with a bypassed portion (503) including two adjacent LEDs (504_3 and 504_4) of the LED string (502), and sinks a bypass current (IBYPASS) according to a battery voltage (VIN).