Patent Number: 7,825,599

Title: Lighting control apparatus of vehicle-purpose lighting device

Abstract: A lighting control apparatus of a vehicle-purpose lighting device can contribute power saving effect, and prevention of a deterioration of a semiconductor light source, and also, can maintain driving safety characteristics. When an input terminal becomes a low level while a vehicle is stopped, a PNP transistor is turned ON, so that a source current I1 flows through a current detecting terminal; a switching regulator lights an LED under beam attenuating operation of 70% in accordance with a light emitting degree capable of satisfying a luminous intensity distribution defined in a law; when an upper beam is lighted, the input terminal becomes a low level; a PNP transistor is turned ON; a source current I2 flows through the current detecting terminal, so that the light emitting degree of the LED is further decreased, and thus, the switching regulator lights the LED under beam attenuating operation of 50%.

Inventors: Yagi; Seiichiro (Shizuoka, JP), Ishida; Hiroyuki (Shizuoka, JP), Ito; Masayasu (Shizuoka, JP), Uchiyama; Yoshihiro (Shizuoka, JP)

Assignee: Koito Manufacturing Co., Ltd.

International Classification: B60Q 1/26 (20060101)

Expiration Date: 2019-11-02 0:00:00