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Improvements in or relating to optical filters

机译:滤光器或与之相关的改进

摘要

An infra-red optical filter comprising a coating of germanium on a transparent base is produced by heating the base to 200 DEG C. or more while the germanium is being deposited by evaporation-deposition. In this way a thick coating (e.g. 0.001 inch) is produced with less tendency to flake. Preferably the deposition is in two or more stages and the germanium is evaporated from an electrically conductive boat of tantalum, molybdenum or carbon. Carbon is preferred as the germanium alloys with the metals if the boat is used a few times. The base may be of glass plate, rock salt, synthetic sapphire or periclase or of "Kodial" or "Pyrex" (Registered Trade Marks) glass. The latter are particularly suitable with a thermal expansion coefficient similar to germanium. If the germanium is evaporated upwards the base may be heated with an electrically heated copper slug. After formation of the coating, blooming may be effected with zinc sulphide or metallic selenium.
机译:通过在蒸镀沉积锗的同时将基体加热到200℃或更高温度来生产在透明基体上包括锗涂层的红外滤光片。以此方式产生厚的涂层(例如0.001英寸),具有较少的剥落趋势。优选地,该沉积是分两个或更多个阶段进行的,并且锗从钽,钼或碳的导电舟皿中蒸发。如果将舟皿使用几次,则碳是首选的锗与金属的合金。基底可以是玻璃板,岩盐,人造蓝宝石或珍珠岩或“ Kodial”或“ Pyrex”(注册商标)玻璃。后者特别适合具有类似于锗的热膨胀系数。如果锗向上蒸发,则可以用电加热的铜块加热基体。涂层形成后,可用硫化锌或金属硒进行起霜。

著录项

  • 公开/公告号GB1014230A

    专利类型

  • 公开/公告日1965-12-22

    原文格式PDF

  • 申请/专利权人 THE MULLARD RADIO VALVE COMPANY LIMITED;

    申请/专利号GB19530029595

  • 发明设计人 CHARNOCK JOHN;

    申请日1953-10-26

  • 分类号G02B5/28;

  • 国家 GB

  • 入库时间 2022-08-23 14:46:45

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