Compositions: ceramic – Ceramic compositions – Glass compositions – compositions containing glass other than...
Patent
1997-07-02
1998-12-29
Group, Karl
Compositions: ceramic
Ceramic compositions
Glass compositions, compositions containing glass other than...
501 64, 501 69, C03C 3083
Patent
active
058541519
ABSTRACT:
The present invention provides a glass body with distributed composition which contains, for example, a rare-earth element having a concentration distribution, which can be produced in high yield while inhibiting cracking at the time of vitrification and which has optical properties advantageous in correcting chromatic aberration in image pickup systems. For example, in a four-component glass composed of SiO.sub.2, Al.sub.2 O.sub.3, Y.sub.2 O.sub.3 and ZrO.sub.2 in which Y.sub.2 O.sub.3 has a recessed parabolic concentration distribution profile being high at the periphery of the glass and low at the center of the glass and in which each of ZrO.sub.2 and Al.sub.2 O.sub.3 has a protrudent parabolic concentration distribution profile lowering from the center of the glass toward the periphery of the glass, there is the relationship:
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Group Karl
Olympus Optical Company Ltd.
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