Toshiba Lighting & Technology Corporation

Toshiba Materials Co., Ltd.

Hideki Okawa

Ryotaro Matsuda

Yasuhiro Shirakawa

Jun Sasaki

Kiyoshi Nishimura

Masami Okamura

Akira Sato

Kayo Nakano

Nobuhiko Betsuda

Takeo Yasuda

Yoshiyuki Matsunaga

Miho Watanabe

Ariyoshi Ishizaki

Takuya Honma

Naoto Mori

Akihiro Sasaki

Hirotaka Tanaka

Katsuhisa Matsumoto

Takaya Kamakura

Kazunari Otsuka

Kiyoshi Yokokura

Kazuo Shimokawa

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

According to one embodiment, in a constricted part of a globe, one end is set to a minimum diameter, the other end is set to a maximum diameter, and a diameter thereof increases from the one end side to the other end side. The constricted part of the globe is concaved into the inside of an imaginary straight line connecting an outer edge of the one end and an outer edge of the other end when viewed in section. A light source part includes a semiconductor light-emitting element and is contained in the globe so that a light-emitting part is positioned between both the ends of the constricted part of the globe. A cap is positioned on one end side of the globe.

Bulb-type lamp and luminaire

An object of the invention is to provide a photocatalyst material having a higher catalyst effect than conventional photocatalyst materials. The photocatalyst material of the invention contains, as its major component, a tungsten oxide powder excited by a light source which emits light having a wavelength of 430 to 500 nm, the photocatalyst material having a decomposition ability of 50% or more wherein the decomposition ability is given by the following equation based on the following test: [Test for decomposition ability]: 1 g of a tungsten oxide powder and 20 ppm of acetaldehyde (amount A) are poured into a 3-liter glass container, and acetaldehyde (amount B) is measured after light having a peak wavelength of 460 nm&#xb1;10 nm is irradiated to the mixture for 2 hours to measure the decomposition ability (%): Decomposition ability (%)=[(acetaldehyde amount A&#x2212;acetaldehyde amount B)/acetaldehyde amount A]&#xd7;100.

Photocatalyst material, photocatalyst composition using the same and photocatalyst product

Growing community of inventors

Yokosuka, Japan

Hideki Okawa