Koito Manufacturing Company, Ltd.

Susumu Ogo

Shinji Ohta

Kotaro Matsui

Takao Sugiyama

A linear regulator supplies a first drive current to a first light source in a first period in which the first light source is turned on and a second light source is not turned on, and in a second period in which the first light source and the second light source are turned on, and stops the supply of the first drive current in a third period in which the first light source and the second light source are turned off. A switching regulator supplies a second drive current to the second light source in the second period, and stops the supply of the second drive current in the third period.

Lighting circuit and vehicular direction indicator lamp

A lighting circuit which lights a semiconductor light source, the lighting circuit includes a drive circuit configured to receive a PWM signal from a controller, to generate a drive current to the semiconductor light source, and to switch the drive current according to the PWM signal. When a non-input state of the PWM signal exceeds a predetermined time, the lighting circuit is configured to assert an abnormality detection signal and to output the abnormality detection signal to the controller.

Growing community of inventors

Shizuoka, Japan

Susumu Ogo