High-refraction high-dispersion phosphate optical glass and heat treating method thereof

Abstract

The present invention provides high refraction and high dispersion optical glass with good chemical stability and devitrification resistance and little erosion on the furnace. The high refraction and high dispersion phosphate optical glass contains components according to weight percentage: 18-30 percent of P2O5, 0.1-10 percent of TiO2, 35-55 percent of Nb2O5, 17-26 percent of BaO, 0-5 percent of ZnO, 0-3 percent of NaO and 0-3 percent of K2O. The refractive index Nd of the optical glass of the invention is more than 1.90, abbe number Vd less than or equal to 22, the light with a wavelength of 450nmor shorter has 70 percent of transmittance, the light with a wavelength of 390nm or shorter has 5 percent of transmittance and the visible light has more than 99 percent of transmittance. The optical glass has better transmittance in short wave section and has comparatively good melting behaviour and chemical stability.

Description

technical field [0001] The invention relates to a high-refraction and high-dispersion phosphate optical glass and a heat treatment method thereof. Background technique [0002] In recent years, with the continuous development of international optoelectronic products, the market demand for optical glass with high refractive index and high dispersion performance is increasing. [0003] JP6-345481 discloses a kind of optical glass, the alkaline earth metal oxide content is little (weight percentage content, the same below) (MgO+CaO+SrO+BaO is 0-20%) in its component, and alkali metal oxide content is many (Li 2 O is 0-8%, Na 2 O+K 2 O is 0-20% or more), which will have an adverse effect on the chemical stability and devitrification resistance of the glass. [0004] CN1590328A and CN1657461A disclose a kind of optical glass, all must add Sb in its component 2 o 3 to prevent coloring of the glass, but Sb 2 o 3 It will increase the platinum erosion of the glass to the furn...

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Problems solved by technology

[0003] JP6-345481 discloses a kind of optical glass, the alkaline earth metal oxide content is little (weight percent content, the same below) (MgO+CaO+SrO+BaO is 0-20%) in its component, and alkali metal oxide content is many (Li 2 O is 0-8%, Na 2 O+K 2 O is 0-20% or more), which will have an adverse effect on the chemical stability and devitrification resistance of the glass

[0004] CN1590328A and CN1657461A disclose a kind of optical glass, all must add Sb in its component 2 o 3 to prevent coloring of the glass, but Sb 2 o 3 It will increase the platinum erosion of the glass to the furnace, especially the platinum furnace, causing more platinum ions to enter the glass. Due to the characteristic absorption of platinum ions, it is not conducive to improving the transmittance of the glass in the short-wave band (380-450nm), and the platinum ions Detrimental effect on the service life of the furnace

[0005] In addition, the embodiments of the above-mentioned 3 patent documents all contain B 2 o 3 component, although B 2 o 3 The addition of B is beneficial to improve the devitrification resistance of the glass, but the introduction of B in the phosphate system glass 2 o 3 component, due to B 2 o 3 Strong volatility will increase the volatilization of glass components during glass melting and molding, resulting in streaks in glass

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