Translucent ceramic, method for manufacturing the same,...

Details Translucent ceramic, method for manufacturing the same,... Translucent ceramic, method for manufacturing the same,...

2007-09-10

2008-07-08

Group, Karl E (Department: 1793)

Compositions: ceramic

Ceramic compositions

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

C501S136000, C501S137000, C501S138000, C428S701000, C428S702000, C264S673000

Reexamination Certificate

active

07396790

ABSTRACT:
A translucent ceramic having a high light transmittance is provided. It contains a perovskite compound having a composition represented by a general formula: (Ba1-s-tSrsCat)(MxB1yB2z)vOw(where M contains at least one of Sn, Zr and Hf, B1 represents at least one of Mg, Zn, Y and In, B2 represents at least one of Ta and Nb, each of conditions of 0≦s≦0.99, 0.01≦t≦0.45, x+y+z=1, 0<x≦0.9, 1.00≦z/y≦2.40, and 0.97≦v≦1.05 is satisfied, and w represents a positive number for maintaining electrical neutrality) as a primary component. This translucent ceramic can be used as, for example, an objective lens (2) of an optical pickup (9) to provide advantages. In another aspect some of M is replaced by Ti.

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