Translucent ceramics, process for producing the same,...

Details Translucent ceramics, process for producing the same,... Translucent ceramics, process for producing the same,...

2007-11-13

2007-11-13

Group, Karl (Department: 1755)

Compositions: ceramic

Ceramic compositions

Titanate, zirconate, stannate, niobate, or tantalate or...

C501S135000, C501S137000, C501S138000

Reexamination Certificate

active

10553052

ABSTRACT:
A translucent ceramic principally contains a composition represented by the formula Ba{Tix1Mx2(Mg1-tZnt)y(Ta1-uNbu)z}vOw, wherein M is at least one selected from the group consisting of Sn, Zr, and Hf; w is a positive number for maintaining the electrical neutrality; x1+x2+y+z=1; 0.015≦x1+x2≦0.90; 0<x1≦0.90; 0≦x2≦0.60; 1.60≦z/y≦2.40; 1.00≦v≦1.05; 0<t<1; and 0≦u≦1. The translucent ceramic has high linear transmittance over a wide wavelength range and a large refractive index, is controllable in refractive index and Abbe number in a wide range, and is not birefringent. Therefore, lenses (2) made of the translucent ceramic are suitable for optical pickups (9) and other devices that must be small-sized and thin.

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patent: WO 02/49984 (2002-06-01), None

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