OPTICAL ELEMENT AND METHOD FOR MANUFACTURING THE SAME

• Main Authors: NISHIMURA NORIKAZU, YAMAMOTO HIDEAKI, SATO KOICHI
• Format: Patent
• Language: English; Japanese
• Published: 13.04.2015
• Subjects: CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS; CHEMISTRY; GLASS; JOINING GLASS TO GLASS OR OTHER MATERIALS; MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES; METALLURGY; MINERAL OR SLAG WOOL; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS; SURFACE TREATMENT OF GLASS

PROBLEM TO BE SOLVED: To provide a method for manufacturing an optical element, by which generation of foams in an optical element after press-molding can be suppressed.SOLUTION: The optical element includes an oxide glass and a coating film that at least partially covers a surface of the oxide glass. The coating film is a metal oxide film with deficiency of oxygen than a stoichiometric composition. An intake rate for oxygen atoms of the metal oxide film from the oxide glass, at a temperature equal to or higher than the glass transition temperature of the oxide glass is faster than a diffusion rate of metal atoms included in the metal oxide film to the oxide glass. 【課題】プレス成形後の光学素子に泡が発生することを抑制可能な光学素子の製造方法の提供。【解決手段】酸化物ガラスと、前記酸化物ガラスの表面の少なくとも一部を覆う被覆膜と、を有し、前記被覆膜は、化学量論組成より酸素が欠損した状態にある金属酸化物膜であり、かつ前記酸化物ガラスのガラス転移温度以上の温度における、前記金属酸化物膜が前記酸化物ガラスに含まれる酸素原子を取り込む速度は、前記金属酸化物膜に含まれる金属原子が前記酸化物ガラスへ拡散する速度より速い光学素子。【選択図】なし