Mother glass composition for gradient-index lens, gradient-index lens, manufacturing method thereof, optical product, and optical device

Abstract

The invention provides a matrix glass composition for refraction index profile type lens, which can manufacture the lead-free Li-type refraction index profile type lens having outstanding weathering resistance in particular in the presence of water. The matrix glass composition comprises the ingredients represented by mol%: SiO<2> is no less than 40 but no more than 65, TiO<2> is no less than 1 but no more than 10, MgO is no less than 0.1 but no more than 22, ZnO is no less than 0.15 but no more than 15, Li<2>O is no less than 2 but no more than 18, Na<2>O is no less than 2 but no more than 20, B<2>O<3> is no less than 0 but no more than 20, Al<2>O<3> is no less than 0 but no more than 10, K<2>O is no less than 0 but no more than 3, Cs<2>O is no less than 0 but no more than 3, Y<2>O<3> is no less than 0 but no more than 5, ZrO<2> is no less than 0 but no more than 2, Nb<2>O<5> is no less than 0 but no more than 5, In<2>O<3> is no less than 0 but no more than 5, La<2>O<3> is no less than 0 but no more than 5, Ta<2>O<5> is no less than 0 but no more than 5, and the matrix glass composition also comprises at least two ingredients selected from the group consisting of CaO, SrO and BaO, which are 0.1% by mol to 15% by mol, MgO+ZnO is no less than 2, ZnO / (MgO+ZnO) is no less than 0.07 but no more than 0.93, Li<2>O+Na<2>O is no less than 6 but no more than 38, Y<2>O<3>+ZrO<2>+Nb<2>O<5>+In<2>O<3>+La<2>O<3>+Ta<2>O<5> is no less than 0 but no more than 11.

Description

technical field [0001] The present invention relates to a mother glass composition for a distributed refractive index lens that does not contain lead in its components and is suitable for manufacturing a distributed refractive index lens with excellent weather resistance. In addition, the present invention relates to a distributed refractive index lens obtained using such a mother glass composition for a distributed refractive index lens, a method for producing the same, and an optical product and an optical device including the above distributed refractive index lens. Background technique [0002] Gradient index lenses are rod-shaped or fiber-shaped lenses with a cross-section that has a refractive index distribution that changes from the center to the periphery. For example, they are widely used in endoscopes and optical communication equipment. Optical products, optical equipment and the like. In addition, the distributed refractive index lens is widely used as an imagin...

AI Technical Summary

Problems solved by technology

[0006] However, when a distributed refractive index lens with a large aperture angle is manufactured using a glass composition substantially free of lead, the properties of the manufactured lens, especially the weather resistance, may deteriorate.

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