US 2006/0148635 A1 · Optical glass, optical element using the optical glass and optical instrument including the optical element

Abstract

A mother glass of the present invention for an optical element contains thallium and a boron oxide, serving as an essential component. Therefore, it is possible to manufacture a homogeneous glass body having a low melting temperature and excellent moldability. Further, it is possible to manufacture a distributed index lens having a refractive index distribution required for an optical design, a wide effective visual field, and excellent weather resistance by contacting the glass body with the melted salt of an alkali metal to perform ion exchange. Furthermore, it is possible to provide an optical element and an optical device having excellent optical characteristics by using the distributed index lens.

Claims5

Dependent claims

A glass body containing thallium, consisting of:

35 to 80 mol % of SiO2, 0.1 to 40 mol % of B2O3, 1 to 26 mol % of Tl2O, 1 to 34 mol % of K2O, 0 to 30 mol % of ZnO, 0 to 30 mol % of GeO2, 0 to 20 mol % of TiO2, 0 to 20 mol % of MgO, 0 to 2 mol % of ZrO2, 0 to 8 mol % of Al2O3, 0 to 5 mol % of SnO, 0 to 5 mol % of La2O3, 0 to 8 mol % of Bi2O3, 0 to 2 mol % of Ta2O5, 0 to 1 mol % of Sb2O3, and 0 to 1 mol % of As2O3,
wherein the glass body contains 2 to 26 mol % of Na2O+Li2O,
0.2 to 5.5 mol % of (Na2O+Li2O)/Tl2O,
5 to 35 mol % of Tl2O+R2O (where R is an alkali metal),
0 to 10 mol % of BaO+CaO+SrO,
0 to 8 mol % of ZrO2+Al2O3+SnO(SnO2), and
50 to 80 mol % of SiO2+GeO2+TiO2+B2O3+ZrO2+Al2O3.

4 more elements

Dependencies are inferred from the claim text.

Optical glass, optical element using the optical glass and optical instrument including the optical element

Life of this patent

Optical glass, optical element using the optical glass and optical instrument including the optical element

Life of this patent

Abstract

Claims5