Toshiba Lighting & Technology Corporation

Harison Toshiba Lighting Corporation

Takuya Honma

Kiyoshi Nishimura

Nobuhiko Betsuda

Seiko Kawashima

Hiromichi Kawashima

Makoto Deguchi

Miho Watanabe

Nobuhiro Tamura

Hiroyuki Kato

Hideki Okawa

Kazuo Shimokawa

Akihiro Sasaki

Hirotaka Tanaka

Katsuhisa Matsumoto

According to one embodiment, there is provided a light-emitting device including a light-emitting section, a thermal radiation member, and a heat conduction layer. The light-emitting section includes a mounting substrate section and a light-emitting element section. The mounting substrate section includes a substrate, a first metal layer, and a second metal layer. The substrate includes a first principal plane including a mounting region and a second principal plane. The first metal layer includes mounting patterns provided in the mounting region. The light-emitting element section includes semiconductor light-emitting elements and a wavelength conversion layer. The semiconductor light-emitting elements are connected to the mounting patterns. The luminous existence of the light-emitting element section is equal to or higher than 10 lm/mmand equal to or lower than 100 lm/mm. The thermal radiation member has an area equal to or larger than five times the area of the mounting region.

Light emitting device and luminaire

A metal halide lamp comprises a discharge container including a discharge space and a pair of sealing sections. A discharge medium containing a metal halide and a rare gas and essentially free from mercury is sealed in the discharge container. A pair of electrodes are arranged to face each other within the discharge space, and the side edge portions on the side of the proximal end portion of these electrodes are held by the sealing sections. The amount of water contained in the metal halide, i.e., the light-emitting material, included in the metal halide lamp essentially free from mercury, i.e., Hg-less metal halide lamp, is controlled to 50 ppm or less.

Metal halide lamp, headlight apparatus for vehicle using the same, and method of manufacturing metal halide lamp

Growing community of inventors

Yokosuka, Japan

Takuya Honma