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    • 7. 发明公开
    • METHOD FOR FINISHING SURFACE OF PRELIMINARY POLISHED GLASS SUBSTRATE
    • VERFAHREN ZUR ENDBEARBEITUNG DEROBERFLÄCHEEINESVORLÄUFIGENPOLIERTEN GLASSUBSTRATS
    • EP2098490A1
    • 2009-09-09
    • EP07832417.5
    • 2007-11-22
    • Asahi Glass Company, Limited
    • OTSUKA, KojiOKAMURA, Kenji
    • C03C15/00G01B9/02G01B11/24G01B11/30G03F1/14G03F7/20H01L21/027
    • G01B9/02065C03C15/02C03C19/00C03C23/006C03C2204/08G01B9/02057G01B9/0209G01B11/30G03F1/60H01J2237/0812Y10T428/24355
    • The invention is to provide a method in which waviness generated on a glass substrate surface during pre-polishing is removed, thereby finishing the glass substrate so as to have a surface excellent in flatness. The invention relates to a method for finishing a pre-polished glass substrate surface using any one of processing methods selected from the group consisting of ion beam etching, gas cluster ion beam etching and plasma etching, the glass substrate being made of quartz glass that contains a dopant and comprises SiO 2 as a main component, and the method for finishing a pre-polished glass substrate surface including: a step of measuring flatness of the glass substrate surface using a shape measurement unit that comprises: a low-coherent light source whose outgoing light flux has a coherence length shorter than twice an optical distance between front and back surfaces of the glass substrate; a path match route part that divides the outgoing light flux from the low-coherent light source into two light fluxes, causes one of the two light fluxes to make a detour by a given optical path length relative to the other light flux, and then recombines the light fluxes into a single light flux and outputs it; and an interference optical system that acquires an interference fringe which carries wave surface information of the glass substrate surface by radiating an outgoing light flux from the low-coherent light source onto a reference surface and the glass substrate surface held on a measurement optical axis and making lights returning from the reference surface and the glass substrate surface interfere with each other, and a step of measuring a concentration distribution of the dopant contained in the glass substrate, wherein processing conditions of the glass substrate surface are set up for each site of the glass substrate based on the results obtained from the step of measuring flatness of the glass substrate and the step of measuring a concentration distribution of the dopant contained in the glass substrate, and the finishing is carried out while keeping an angle formed by a normal line of the glass substrate and an incident beam onto the glass substrate surface at from 30 to 89°.
    • 本发明提供一种在预抛光期间在玻璃基板表面产生的波纹被去除的方法,从而使玻璃基板整理成具有优异的平面度的表面。 本发明涉及使用选自离子束蚀刻,气体簇离子束蚀刻和等离子体蚀刻的任何一种处理方法来完成预抛光的玻璃基板表面的方法,该玻璃基板由石英玻璃制成,该石英玻璃包含 掺杂剂并且包括SiO 2作为主要成分,以及用于完成预抛光的玻璃基板表面的方法,包括:使用形状测量单元测量玻璃基板表面的平坦度的步骤,该形状测量单元包括:低相干光源, 出射光通量的相干长度短于玻璃基板的前表面和后表面之间的光学距离的两倍; 将来自低相干光源的出射光通量分成两个光束的路径匹配路线部分,使得两个光束中的一个相对于另一光束通过给定光路长度绕行,然后重新组合 光通入单个光通量并输出; 以及干涉光学系统,其通过将来自所述低相干光源的出射光束照射到参考面上并且将所述玻璃基板表面保持在测量光轴上而获取携带所述玻璃基板表面的波面信息的干涉条纹, 从基准面返回的光和玻璃基板表面相互干涉,测定包含在玻璃基板中的掺杂剂的浓度分布的步骤,对玻璃基板的各个部位设置玻璃基板表面的处理条件 基于从测量玻璃基板的平坦度的步骤获得的结果和测量玻璃基板中所含的掺杂剂的浓度分布的步骤,并且在保持由玻璃基板的法线形成的角度的同时进行精加工 玻璃基板和入射光束在30至89°的玻璃基板表面上。