Ultraviolet cut material, ultraviolet cut filter, discharge lamp and lighting apparatus

Abstract

The invention provides an ultraviolet cut material whose main ingredient is zinc oxide particulates 1 adulterated with indium, the particulates contain solid solution having crystal structure of aeonite, the half-value width of diffraction peak of X ray diffraction surface (110)'s diffraction angle 2theta is between 0.4~0.1 degrees. The invention can provide ultraviolet cut material and ultraviolet cut filter F and so on, because the aeonite crystal structure of zinc oxide particulates 1 adulterated with indium is restricted in the range especially prescribed by X ray diffraction, the cutoff wavelength's temperature dependency is improved, especially the absorption characteristic of ultraviolet and blue light under high temperature condition is improved. The ultraviolet cut filter is applicable for discharge lamp such as high voltage discharge lamp as well as lighting apparatus.

Description

technical field [0001] The present invention relates to an ultraviolet cut material (ultraviolet cut material) or an ultraviolet cut filter (ultraviolet cut filter) using the ultraviolet cut material, and a discharge lamp (discharge lamp) having the ultraviolet cut material and the ultraviolet cut filter ) and a lighting fixture, wherein the ultraviolet cutoff material forms an ultraviolet cutoff filter that cuts off at least ultraviolet rays. Background technique [0002] There are known light sources for lighting and lighting fixtures that are provided with a light cut filter that cuts (cuts off) ultraviolet rays and that can radiate visible light (visible light). The light sources and lighting fixtures are mainly used for low-ultraviolet insect-attraction or clean room lighting. [0003] As the previous lamps or lighting fixtures for low insect-attraction, it is well known that there is the following structure: the surface of the light-transmitting material is coated wit...

AI Technical Summary

Problems solved by technology

[0008] The ultraviolet cut filters of Patent Documents 1 and 2 can cut light with a wavelength of about 410nm, but since they are made of resin, they have a heat resistance temperature of about 100°C or less and there are problems in durability.

[0009] Moreover, the ultraviolet cut filter such as Patent Document 3 is mainly composed of zinc oxide (ZnO) particles as an inorganic oxide, so it is excellent in heat resistance and durability, but the cutoff wavelength is about 380 nm or less, and it is difficult to Cut off light on the longer wavelength side

[0010] Moreover, because ZnO is easily soluble in both acid and alkali, so in harsh environments, such as salt damage near the coast, there is a lot of SO x , NO x In high humidity conditions, etc., the film is likely to deteriorate, and the strength is reduced, which may cause peeling, etc.

[0011] Furthermore, the composite oxide like Patent Document 4 cannot form an ultraviolet cut filter with high visible light transmittance unless a coating is formed using a fine powder of 1200 or more. The synthetic material obtained by solid-phase synthesis (solid-phase synthesis) at high temperature is crushed into submicron (submicron) or below, such as less than or equal to 200nm.

Because the pulverization process of the synthetic material is cumbersome, it will increase the manufacturing cost of the filter

[0012] In addition, the ultraviolet cut material of Patent Document 5 is close to the relatively easy conventional method in its manufacturing steps, so the manufacturing cost is reduced, but the ultraviolet and blue light absorption properties are not at a sufficient level, and there is still room for improvement.

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