Improved near infrared ray filter glass

Abstract

The invention provides improved near infrared ray filter glass which comprises a glass substrate with the thickness of 0.19 mm-0.4 mm. The center wavelength of the glass substrate is in a range of 640 nm-650 nm; the glass substrate comprises, by the molar percentage, 35%-45% of Al(PO3)3, 10%-25% of P2O5, 3%-7% of SrO and 6%-15% of CuO. The improved near infrared ray filter glass has excellent chemical stability and high penetration rate, has the molding temperature reduced, and can be resistant to severe high temperature and high humidity environments.

Description

technical field [0001] The invention relates to an improved near-infrared filter glass, in particular to a near-infrared filter glass with improved spectral sensitivity that absorbs and filters near-infrared rays and has high penetration performance. Background technique [0002] In recent years, semiconductor camera components such as CCD and CMOS used in digital cameras and smart phones have expanded from the field of visible light to the field of near-infrared light near the wavelength of 1100nm, and can be obtained by using filters that absorb near-infrared light. Approximate to human visual sensitivity. Generally, glass materials for molding have three important basic indicators, namely high refractive index, high transmittance and low glass transition temperature. The purpose of pursuing a high refractive index is to achieve the same optical quality with fewer lenses, so that the volume and weight can be reduced to achieve the purpose of lightness and compactness. Th...

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Problems solved by technology

However, there is a problem that Young's modulus of elasticity is not good, resulting in poor processability, making the glass brittle and easy to damage, which greatly increases the cost.

[0007] Compared with silicate glass, phosphate glass has a lower melting temperature, low glass transition temperature, high thermal expansion coefficient and excellent optical properties. It has high transmittance in the visible and near-infrared regions and is very suitable for use in optical materials. However, the shortcomings of insufficient weather resistance and high sintering temperature (1250°C) that affect the performance of the transmittance limit its application fields.

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