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    • 2. 发明公开
    • Method of measuring the aberration of a projection lens
    • Verfahren zur Messung der Aberration eines Projektionsobjektivs
    • EP1251401A1
    • 2002-10-23
    • EP01109760.7
    • 2001-04-20
    • Infineon Technologies SC300 GmbH & Co. KGInfineon Technologies AGMOTOROLA, INC.
    • Ganz, DietmarMaltabes, JohnSchedel, Thorsten
    • G03F7/20
    • G03F7/706G03F7/70633
    • A new inspection method is provided for testing lens aberrations during production of semiconductor wafers in projection apparatus such as wafer steppers or scanners. It is checked for lens degradation by measuring aberration specific measurement pattern structures (3) preferrably being arranged in fields of a test mask, and then projected to corresponding measurement pattern structures (8) on the wafer. A signal is issued, if threshold values (2) representing a corresponding aberration such as spherical aberration, astigmatism, coma or three-leaf-clover are exceeded. For the latter measurement symmetric DT-like pairs of rectangles (303) are provided in order to compare left-to-right-differences in critical dimension with threshold values (2). Also, structures combining sagittal and tangential lines into, e.g., waggon wheel-like structures (304) are provided. As a result of the signal (1) issued, a tool dedication strategy such as to reduce tool specifications can be initiated.
    • 提供了一种新的检查方法,用于在诸如晶片步进器或扫描仪的投影设备中制造半导体晶片期间测试透镜像差。 通过测量优选地被设置在测试掩模的场中的像差特定测量图案结构(3)来检查晶体退化,然后投影到晶片上的相应测量图案结构(8)。 如果超过表示像差的像差(例如球面像差,散光,彗差或三叶三叶草)的阈值(2),则发出信号。 对于后一种测量,提供对称的类似DT的矩形对(303),以便将临界尺寸的左右差异与阈值(2)进行比较。 另外,提供将矢状线和切向线组合成例如轮状轮状结构(304)的结构。 作为发出信号(1)的结果,可以启动诸如减少工具规格的工具奉献策略。