Toyoda Gosei Co., Ltd.

Tetsuo Tanabe

Osamu Yamanaka

Hiroshi Sugihara

Tadanobu Iwasa

Akihiro Misawa

Takemasa Yasukawa

Kazushi Noda

Makoto Tamaki

Yasumasa Tatewaki

Yoshio Sano

Takao Mukogawa

An illuminating system includes illumination device adapted for being installed inside a car cabin, and an operation device being able to wirelessly operate illumination modes of the illumination device.

Illuminating system

An LED power supply device has a loop circuit formed by a switching circuit, an LED and a comparison circuit, and a reference voltage generation circuit for providing reference voltage to the comparison circuit. The loop circuit oscillates so that substantially constant current is applied to the LED.

LED power supply device

A direct lighting unit fits in opposition to an opening of a roof of a vehicle's cabin so as to illuminate a light directly the cabin. An indirect lighting unit is disposed around the outer circumference of the direct lighting unit. The indirect lighting unit contains a plurality of LEDs disposed at fixed intervals so as to emit light outward. The LEDs are controlled to indirectly illuminate the roof. When the direct lighting unit is mounted to the roof, a fixing piece supports a grooved edge portion of the indirect lighting unit so that the indirect lighting unit is immovably held between the fixing piece and the roof. Thus, the direct and indirect lighting units are simultaneously secured to the roof.

Indirect lighting system for vehicle interior

A vehicle display device such as a speed meter including indicators, many segments illuminated in two or more colors by plural LEDs and an indicator control circuit. The indicators dispose the segments so as to display a variable such as a car speed in a bar graph or in the form of a number. The indicator control circuit displays the variable by controlling the lighting of the LEDs and changes an emitted light color of indication based on a fixed color changing reference value in accordance with a value of the variable. The control circuit controls a duty ratio of a supply current or a current value in a predetermined set value range determined on the basis of the color changing reference value. Namely, brightness of the emitted light color before a color change is gradually decreased, while brightness of the emitted light color after the color change is gradually increased.

Vehicle display device

Growing community of inventors

Aichi, Japan

Tetsuo Tanabe