OPTICAL GLASS, PREFORM FOR PRECISION PRESS MOLDING, METHOD FOR MANUFACTURING PREFORM FOR PRECISION PRESS MOLDING, OPTICAL ELEMENT, AND METHOD FOR MANUFACTURING OPTICAL ELEMENT

摘要

The present invention relates to an optical glass having optical constants in the form of a refractive index nd of 1.70 or higher and an Abbé number nud of 50 or higher, a preform for precision press molding comprised of this glass, an optical element comprised of this glass, and methods for manufacturing the preform and the optical element.