Heavy lanthanum flint glass and its preforms, optical components and optical instruments

Abstract

The invention discloses a heavy lanthanum flint glass and its prefabricated piece, optical element and optical instrument. The heavy lanthanum flint glass contains by weight %: SiO 2 : 12‑30%, Ln 2 o 3 : 10‑25% of the Ln 2 o 3 for la 2 o 3 、Gd 2 o 3 , Y 2 o 3 and Yb 2 o 3 The total content of TiO 2 +Nb 2 o 5 +WO 3 +Bi 2 o 3 : 10.5‑40%, RO: 20‑35%, the RO is one or more of BaO, CaO, MgO and SrO, ZrO 2 : 0.5-10%, the refractive index (nd) of the glass is 1.86-1.92, the Abbe number (vd) is 25-30, and the crystallization upper limit temperature is below 1200°C. The glass can meet the optical properties required by precision instruments, and has excellent anti-devitrification performance, low temperature coefficient of refractive index, good chemical stability, and high transmittance.

Description

technical field [0001] The invention belongs to the field of optical glass, and in particular relates to heavy lanthanum flint glass and its prefabricated part, optical element and optical instrument. Background technique [0002] Heavy lanthanum flint glass with a refractive index (nd) of 1.86-1.92 and an Abbe number (vd) of 25-30 can be used to manufacture lenses, prisms, mirrors, etc. in optical instruments. After continuous updating and improvement, these heavy lanthanum flint glasses can meet the requirements of modern precision molding process, and the market demand is increasing day by day. [0003] However, the crystallization upper limit temperature of the existing heavy lanthanum flint glass is relatively high, the stability of the glass is poor during high temperature processing, and the thermal processing technology is difficult. Moreover, it has poor corrosion resistance to water, acid and other substances. If it is applied in a high water content or acidic env...

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Problems solved by technology

[0003] However, the crystallization upper limit temperature of the existing heavy lanthanum flint glass is relatively high, the glass has poor stability when processed at high temperature, and the thermal processing process is difficult

Moreover, it has poor corrosion resistance to water, acid and other substances. If it is applied in a high water content or acidic environment, the quality and service life of glass components will drop sharply.

At the same time, the existing heavy lanthanum flint glass has a relatively high temperature coefficient of refraction, and the resulting thermal aberration also limits the application of heavy lanthanum flint glass in the fields of medical treatment, night photography, integrated circuit lithography, etc.

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