Toyoda Gosei Co., Ltd.

Takao Mukogawa

Tadanobu Iwasa

Osamu Yamanaka

Hiroshi Sugihara

Akihiro Misawa

Yasumasa Tatewaki

Kazuhiro Sakai

Tetsuo Tanabe

Toshio Takahashi

A short-wave light transmitting diode lamp unit has a printed circuit board disposed in a housing. A plurality of short-wave light emitting diode chips is mounted on the printed circuit board so that a light emission side of the light emitting diode chip faces an opening of the housing. An outer glass as a light transmitting plate is attached to the opening of the housing. The outer glass is made of a glass material having high ultraviolet ray transmittance. The outer glass is prevented from degradation caused by the ultraviolet rays. Thus, the light output efficiency is kept in good level and long lifetime is assured. An overall structure becomes simple, thereby reducing the production costs.

Lamp unit using short-wave light emitting 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 passenger-cabin lighting device comprises as follows. A transparent member is made of synthetic resin not containing scattering material, and has a light emitting surface and a light reflecting surface. A semitransparent member is made of semitransparent synthetic resin containing the scattering material. The semitransparent member is bonded to an inside of the transparent member to constitute a light emitting body. A plurality of light emitting diodes are diposed on one end face of the light emitting body for projecting light into the transparent member and the semitransparent member. A control circuit controls flickering of the plurality of light emitting diodes. The thus constructed passenger-cabin lighting device may be used for lighting and illuminating the passenger cabin, and for highlighting the car itself.

Passenger-cabin lighting device

Growing community of inventors

Bisai, Japan

Takao Mukogawa