GLASS MATERIAL FOR MOLD-PRESS FORMING, MANUFACTURING METHOD OF GLASS MATERIAL, AND MANUFACTURING METHOD OF GLASS OPTICAL ELEMENT

摘要

PPROBLEM TO BE SOLVED: To provide a means capable of stably producing an optical element having sufficient optical performance by using an optical glass containing an easily reducible component or fluorine and suppressing unnecessary interfacial reaction in press forming. PSOLUTION: The glass material for mold-press forming comprises: a core part made of an optical glass of a multi-component system which contains at least one kind of the easily reducible component comprising W, Ti, Bi and Nb; and a coating part which is made of a glass of multi-component system having a content of the easily reducible component less than that of the core part or having no easily reducible component, and applies coating to the surface of the core part is coated. Otherwise, the glass material for mold-press forming comprises: a core part made of an optical glass of a multi-component system which contains fluorine; and a coating part which is made of a glass of multi-component system having a content of fluorine thereof less than that of the core part or having no fluorine therein, and applies coating to the surface of the core part. In the manufacturing method of glass optical element, the glass material preformed into a predetermined shape is heated and softened and the press forming is performed by using a forming mold. PCOPYRIGHT: (C)2008,JPO&INPIT