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    • 2. 发明申请
    • HIGH-RRESOULUTION GAS GAUGE PROXIMITY SENSOR
    • 高精度气体接近传感器
    • WO2005022082A1
    • 2005-03-10
    • PCT/US2004/027447
    • 2004-08-25
    • ASML HOLDING N.V.LYONS, Joseph, H.
    • LYONS, Joseph, H.
    • G01B13/00
    • G01B13/12G01B13/00G01B13/16
    • An apparatus and method for precisely detecting very small distances between a measurement probe (128) and a surface (132), eg. a semiconductor substrate and more particularly to a proximity sensor using a constant gas flow and sensing a mass flow rate within a pneumatic bridge to detect very small distances. Within the apparatus the use of a flow restrictor (120, 122) and/or snubber (110) made of porous material and/or a mass flow rate controller (106) reduces turbulence and acoustic noise and thus enables detection of very small distances in the nanometer to sub-nanometer range. It is in particular proposed to use in the probe a nozzle having an elongated or stretched cross-section to achieve higher accuracy in topographic measurements. An application in photolithography is also foreseen.
    • 一种用于精确检测测量探针(128)和表面(132)之间的非常小距离的装置和方法,例如, 更具体地涉及使用恒定气流并感测气动桥中的质量流量以检测非常小的距离的接近传感器。 在该设备内,使用由多孔材料制成的限流器(120,122)和/或缓冲器(110)和/或质量流量控制器(106)可以减少湍流和声学噪声,从而能够检测非常小的距离 纳米至亚纳米范围。 特别提出在探头中使用具有细长或拉伸横截面的喷嘴,以在地形测量中实现更高的精度。 还可以预见在光刻中的应用。