Microcrystalline glass and multilayer inorganic film filter

Abstract

The invention provides the microcrystalline glass for the multilayer inorganic film filter, which has higher mechanical property. The microcrystalline glass comprises the following components in percentage by weight: 69-80% of SiO2; 8 to 12.5 percent of Li2O; 4 to 10 percent of Al2O3; 1.5 to 3 percent of P2O5; 1 to 8% of ZrO2; 0.5 to 3.0 percent of K2O; and 0.5 to 5 percent of MgO + ZnO + BaO + SrO. The microcrystalline glass disclosed by the invention does not contain harmful components such as PbO or As2O3. The invention has a high expansion coefficient, the refractive index change of the inorganic film can be avoided at the application temperature of the multilayer inorganic film filter, the temperature stability of the product can be improved, the mechanical property and the chemical stability are high, the durability of the filter is ensured, and the filter has high transmittance at a certain waveband (960-1600nm).

Description

[0001] This application is a divisional application of a Chinese invention patent application with an application date of May 30, 2016, an application number of 201610370296.5, and an invention title of "Ceramic Glass and Multilayer Inorganic Film Filter"; the parent application requires an application date of It is the priority right of the Chinese invention patent application dated June 10, 2015, with the application number 201510316173.9, and the title of the invention is "Ceramic Glass and Multilayer Inorganic Film Filter". technical field [0002] The invention relates to a crystallized glass and a multilayer inorganic film filter. Background technique [0003] The multilayer film filter is composed of a substrate and an inorganic thin film formed on the substrate by deposition method, radio frequency ion plating method, magnetron sputtering method, etc. The inorganic thin film is composed of high refractive index inorganic film and low refractive index inorganic film al...

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Problems solved by technology

[0006] Generally, the substrate used in optical filters for cameras is plastic. Because the heat resistance of plastic is not good, when the band-pass filter is used, strong laser light is incident, and the plastic is prone to deformation and deterioration. Therefore, it must be used good glass

[0007] If the band-pass filter uses amorphous glass as the substrate, due to the low thermal expansion, low mechanical strength and low surface hardness of the amorphous glass, the compressive force and durability of the amorphous glass substrate to the inorganic film are not enough, but if To increase the expansion coefficient of amorphous glass, it is necessary to add a large amount of Na 2 O Alkaline component, but glass contains Na 2 O, will lead to poor film formation on glass, and the migration of alkali ions will deteriorate the mechanical properties and surface properties of the substrate, thus limiting its wide application

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