Glass ceramic and multilayer inorganic membrane filter

Abstract

The invention provides high-mechanical-property glass ceramic for a multilayer inorganic membrane filter. The glass ceramic comprises, by weight, 69-80% of SiO2, 8-12.5% of Li2O, 4-10% of Al2O3, 1.5-3% of P2O, 1-8% of ZrO2, 0.5-3.0% of K2O and 0.5-5% of MgO+ZnO+BaO+SrO. The glass ceramic is free of harmful components such as PbO or As2O3 and high in expansion factor, refractive index variation of an inorganic membrane can be avoided at an application temperature of the multilayer inorganic membrane filter, and accordingly product temperature stability can be improved. In addition, the glass ceramic is high in mechanical property and chemical stability, durability of the filter is guaranteed, and high transmittance in a certain waveband (960-1600nm) is realized.

Description

technical field [0001] The invention relates to a crystallized glass and a multilayer inorganic film filter. Background technique [0002] 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 alternately constitute. The multi-layer filter has the function of cutting off a specific wavelength, passing a special wavelength or anti-reflection. Among them, the filter that cuts off a specific wavelength is a notch filter, and the filter that only passes a specific wavelength is a bandpass filter. Passing a specific short wavelength or long wavelength in the pass filter is a high-pass or low-pass filter (ND filter). Therefore, the multilayer film filter can be used as a passive component for demultiplexing and multiplexing ...

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Problems solved by technology

[0005] 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

[0006] 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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