Illuminating devices employing titanium dioxide photocatalysts
First Claim
1. A titanium dioxide photocatalyst structure comprising:
- a transparent glass substrate having first and second opposing surfaces, the first surface of said substrate receiving light from an external light source; and
a titanium dioxide film having first and second opposing surfaces, a light transmittance of said titanium dioxide film being at least 50% for light having a wavelength of 550 nm, the first surface of said titanium dioxide film being formed on the second surface of said substrate, whereby light transmitted from said external source through the first and second opposing surfaces of said substrate and through the first surface of said titanium dioxide film to the second surface thereof causes photocatalytic action to be generated on the second surface of said titanium dioxide film.
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Abstract
A titanium dioxide film (2) having at least photocatalytic activity, whose light linear transmittance corresponding to light having a wavelength of 550 nm is not less than 50% and whose thickness is 0.1 to 5 μm or so, is formed on a transparent substrate (1) constituted by a glass plate or the like. Preferably, a precoat film (3), which has optical transmissivity and is constituted by a SiO2 film having a thickness of 0.02 to 0.2 μm or so, is provided between the transparent substrate (1) and the titanium dioxide film (2). Thereby, excellent photocatalytic action and optical transmissivity can be obtained. Moreover, members composing various structures such as a glass window, which are especially required to have optical transparency, can be further provided with photocatalytic activities.
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Citations
10 Claims
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1. A titanium dioxide photocatalyst structure comprising:
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a transparent glass substrate having first and second opposing surfaces, the first surface of said substrate receiving light from an external light source; and
a titanium dioxide film having first and second opposing surfaces, a light transmittance of said titanium dioxide film being at least 50% for light having a wavelength of 550 nm, the first surface of said titanium dioxide film being formed on the second surface of said substrate, whereby light transmitted from said external source through the first and second opposing surfaces of said substrate and through the first surface of said titanium dioxide film to the second surface thereof causes photocatalytic action to be generated on the second surface of said titanium dioxide film. - View Dependent Claims (2, 3, 4, 5)
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6. An illuminating lamp comprising:
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a light emitting portion for radiating light, which contains visible light as a main component but further includes an ultraviolet light component in a glass container; and
a titanium dioxide film which is formed on a surface of said glass container, and which has photocatalytic activity due to absorption of ultraviolet light and is adapted to allow at least 50% of visible light, which has wavelengths, whose center wavelength is 550 nm, and is radiated from said light emitting portion and transmitted by said glass container, to pass therethrough. - View Dependent Claims (7, 8)
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9. A window glass comprising a glass plate, on at least one of surfaces of which a titanium dioxide film effecting a photocatalytic action , wherein said titanium dioxide film has a linear transmittance, whose value is 50% or more corresponding to light having a wavelength of 550 nm and is 50% or less corresponding to light having a wavelength of 350 nm, and
wherein said titanium dioxide film has capability of decomposing 0.5 g or more of linoleic acid per cm2 of the surface of said film when irradiating ultraviolet light including light, whose wavelength ranges from 300 to 400 nm, at intensity of 5 mW/cm2.
Specification