PHOTOCATALYST, LIGHT SOURCE AND LIGHTING DEVICE - TOSHIBA LIGHTING & TECHNOLOGY

Title:

PHOTOCATALYST, LIGHT SOURCE AND LIGHTING DEVICE

Document Type and Number:

WIPO Patent Application WO/1998/025700

Kind Code:

A1

Abstract:

A light-transmitting cover (9) is so provided as to cover a high voltage sodium lamp (11) which emits at least visible light and light whose wavelength ranges 300 nm - 400 nm. A photocatalyst film (13) is so formed at least on one of the inner and outer surfaces of the light-transmitting cover (9) in such a way that the visible light does not interfere with each other. The main component of the material of the photocatalyst film (13) is titania (TiO�2?) whose visible light transmissivity has its peak at a wavelength approximately equal to the peak wavelength of the visible light of the high voltage sodium lamp (11). Oxidation and decomposition of substances are accelerated by ultraviolet radiation emitted by the high voltage sodium lamp (11) with the photocatalyst film (13), and contamination of the light-transmitting cover (9) is avoided. Even if the thickness of the photocatalyst film (13) is increased in order to improve the photocatalytic action, the peak wavelength of visible light emitted by the high voltage sodium lamp (11) is transmitted through the photocatalyst film (13) efficiently and the degradation of the lighting efficiency is suppressed.

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Inventors:

SOMA RYUJI (JP)
HONDA HISASHI (JP)
ISHIZAKI ARIYOSHI (JP)
WATANABE TSUTOMU (JP)
KAMATA HIROSHI (JP)
SAITOU AKIKO (JP)
ENDOU AKIMASA (JP)

Application Number:

PCT/JP1997/002828

Publication Date:

June 18, 1998

Filing Date:

August 13, 1997

Export Citation:

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Assignee:

TOSHIBA LIGHTING & TECHNOLOGY (JP)
NIHON DORO KODAN JAPAN HIGHWAY (JP)
SOMA RYUJI (JP)
HONDA HISASHI (JP)
ISHIZAKI ARIYOSHI (JP)
WATANABE TSUTOMU (JP)
KAMATA HIROSHI (JP)
SAITO AKIKO (JP)
ENDOU AKIMASA (JP)

International Classes:

C03C17/23; B01J21/06; B01J35/00; B01J35/02; B01J37/02; C03C17/25; C03C17/34; F21V3/04; H01J61/35; H01K1/32; (IPC1-7): B01J35/02; B01J21/06; F21V3/04; H01J61/35; H01K1/32

Domestic Patent References:

WO1996013327A1

1996-05-09

Foreign References:

JPH0972761A	1997-03-18
JPH0971437A	1997-03-18
JPH08273631A	1996-10-18
JPH0929103A	1997-02-04
JPH0957113A	1997-03-04

Other References: