Near-infrared light absorbing glass, element and filter

Abstract

The invention provides an environment-friendly near-infrared light absorbing glass, element and filter with high chemical stability and excellent permeation characteristic in the visible range. When the thickness of the near-infrared light absorbing glass is 0.3 mm, the transmittance at the wavelength of 400 nm is greater than 83%, and the transmittance at the wavelength of 500 nm is greater than 85%; and in the spectral transmittance within the wavelength range of 500 nm to 700 nm, the wavelength range is 631-655 nm when the transmittance is 50%. The near-infrared light absorbing glass contains Al(PO3)3, AlF3, R'F2, ZnO and CuO, wherein the R'F2 represents the sum of MgF2, CaF2, SrF2 and BaF2. The water-resistant action stability DW of the glass reaches Grade 1, and the acid-resistant action stability DA reaches or is superior to Grade 4.

Description

technical field [0001] The invention relates to a near-infrared light absorption glass, a near-infrared light absorption element and a near-infrared light absorption filter. Specifically, the present invention relates to a near-infrared light-absorbing glass that is suitable for color sensitivity correction and is excellent in chemical stability, and a near-infrared light-absorbing element and filter made of the glass. Background technique [0002] In recent years, the spectral sensitivity of semiconductor imaging elements such as CCD and CMOS used in digital cameras and VTR cameras has spread to the near-infrared region around 1100nm from the visible region. Using filters that absorb light in the near-infrared region can obtain approximate Human visual sensitivity. Therefore, the demand for filters for color sensitivity correction is increasing, which puts forward higher requirements for near-infrared light-absorbing functional glasses used to manufacture such filters, tha...

AI Technical Summary

Problems solved by technology

However, if the glass is directly thinned, the absorption of near-infrared light will also be reduced, and the desired spectral characteristics cannot be obtained. 2+ content to make up for the reduction in absorption caused by thinning, while the near-infrared light absorption filter glass Cu 2+ Cu 2+ The valence number changes, the transmittance near 400nm decreases and turns blue-green

In addition, if adding Cu 2+ If the amount is too high, the devitrification resistance of the glass will deteriorate, and the crystals in the glass will be easily precipitated.

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