Asahi Glass Company, Limited

Agc Inc.

Toshihisa Okada

Seiki Ohara

Kenji Imakita

Shotaro Takenobu

Satoko Noma

Kazuo Watanabe

Yasuko Osaki

Keisuke Hanashima

Katsuyoshi Nakayama

Kenta Kobayashi

Akihiro Hishinuma

Shiro Ohtaki

The present invention provides a polymer optical waveguide containing: a core; and a cladding having a refractive index lower than that of the core, provided around the core, in which the polymer optical waveguide has a core-coupling section where at least a part of the cladding is not present along a light propagation direction of the polymer optical waveguide and an application type removal film A provided so as to come into contact with the core of the core-coupling section.

Polymer optical waveguide

The present invention relates to a composite optical waveguide () containing a polymer optical waveguide and a silicon optical waveguide adiabatically coupled to each other, in which the polymer optical waveguide and the silicon optical waveguide are coupled to each other by an adhesive layer in an adiabatic-coupling portion where a core of the polymer optical waveguide and a core of the silicon optical waveguide are disposed to face each other, the adhesive layer is formed by using a photocurable adhesive having a glass transition point Tg being 125&#xb0; C. or higher after curing, and the adiabatic-coupling portion includes a region in which a spacing t between the core of the polymer optical waveguide and the silicon optical waveguide is 1.5 &#x3bc;m or less.

Composite optical waveguide

Provided is a light-emitting device provided with a light reflection layer which has a high light reflectivity and which is less susceptible to deterioration of the reflectivity due to corrosion, and having an improved light extraction efficiency. A light-emitting device comprising a substrate having a conductor layer formed on its surface and a light-emitting element disposed on the conductor layer, characterized in that an overcoat layer is formed between the conductor layer and the light-emitting element, and the overcoat layer is a borosilicate glass which comprises, as represented by mol % based on oxides, from 62 to 84% of SiO, from 10 to 25% of BO, from 0 to 5% of AlOand from 0 to 5% in total of at least one of NaO and KO, provided that the total content of SiOand AlOis from 62 to 84%, and may contain from 0 to 10% of MgO and at least one of CaO, SrO and BaO in a total content of at most 5%.

Light-emitting device

A ceramic material composition comprising from 20 to 50 mass % of a borosilicate glass powder, from 25 to 55 mass % of an alumina filler powder and from 10 to 45 mass % of a filler powder (a high refractive index filler powder) having a refractive index higher than the alumina filler powder, wherein the borosilicate glass powder comprises, as calculated as oxides, from 30 to 70 mass % of SiO, from 5 to 28 mass % of BO, from 5 to 30 mass % of AlO, from 3 to 35 mass % of CaO, from 0 to 25 mass % of SrO, from 0 to 25 mass % of BaO, from 0 to 10 mass % of NaO, from 0 to 10 mass % of KO, from 0.5 to 10 mass % of NaO+KO and from 3 to 40 mass % of CaO+SrO+BaO, and satisfies the following conditions:

Ceramic material composition

Growing community of inventors

Tokyo, Japan

Toshihisa Okada