Blue glass filter with high pass rate of visible light

Abstract

The invention discloses a blue glass filter with a high pass rate of visible light in the technical field of optical devices, which comprises a blue glass substrate with a light finishing layer adhering to the top. The top of the light finishing layer is provided with a complex film. The top of a high temperature resistant film is provided with a protecting film using the blue glass as the substrate, which can filter infrared effectively in a manner of absorption. The light finishing layer can effectively correct the light and is difficult to generate the problem of imaging interference. A high refractive index film and a low refractive index film which are respectively prepared from LaTiO3 material and magnesium fluoride, aluminum fluoride or sodium fluoride materials, improve the mean transmissivity of light and the stray light can be effectively cut from infrared and ultraviolet. The high temperature resistant film enables the blue glass filter with high pass rate of visible light to be applied to the field with higher temperature. The setting of the protecting film enables the filter to have the advantages of scratch resistance, yellow resistance and super toughness, and the service life of the filter is improved.

Description

technical field [0001] The invention relates to the technical field of optical devices, in particular to a blue glass filter with high visible light transmission rate. Background technique [0002] The filter is made of plastic or glass with special dyes added, the red filter can only let red light pass through, and so on. The transmittance of the glass sheet is almost the same as that of air, and all colored light can pass through, so it is transparent, but after being dyed with a dye, the molecular structure changes, and the refractive index also changes, which changes the passage of some colored light. For example, a beam of white light passes through a blue filter, and a beam of blue light is emitted, while green light and red light are very few, and most of them are absorbed by the filter. Optical filter In mobile phones, cameras and other cameras, the blue glass filter located in front of the image sensor CCD or CMOS can effectively filter out infrared rays and pass t...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a blue glass filter with a high visible light transmission rate, to solve the problem that the ordinary filter proposed in the above background technology is affected by the shooting angle, and the ultraviolet and infrared T50 point wavelength drift is relatively large at different angles. The imaging difference also becomes larger, which is prone to distortion problems

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