The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 29, 1998
Filed:
Jul. 02, 1997
Morinao Fukuoka, Hachiooji, JP;
Olympus Optical Company Ltd., Tokyo, JP;
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: