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    • 6. 发明申请
    • PROJECTION EXPOSURE SYSTEM AND PROJECTION EXPOSURE METHOD
    • 投影曝光系统和投影曝光方法
    • WO2012041341A1
    • 2012-04-05
    • PCT/EP2010/005949
    • 2010-09-30
    • CARL ZEISS SMT GMBHGRÄUPNER, PaulCONRADI, OlafZACZEK, ChristophULRICH, WilhelmBEIERL, HelmutGRUNER, ToralfGRÄSCHUS, Volker
    • GRÄUPNER, PaulCONRADI, OlafZACZEK, ChristophULRICH, WilhelmBEIERL, HelmutGRUNER, ToralfGRÄSCHUS, Volker
    • G03F7/20
    • G03F7/70191G03F7/70308
    • A projection exposure system comprises an illumination system (ILL) configured to receive primary radiation with operating wavelength λ generated by a primary radiation source (S) and to form the primary radiation to generate illumination radiation incident on a mask (M) providing a prescribed pattern (PAT) and a projection objective (PO) configured to project an image of the pattern arranged in an object surface (OS) of the projection objective onto a radiation-sensitive substrate (W) arranged in an image surface (IS) of the projection objective at an image-side numerical aperture NA. An angle-selective filter arrangement (FA) is arranged at or close to a field surface of the projection objective in a projection beam path optically downstream of the object surface. The angle- selective filter arrangement is effective to filter radiation incident on the filter arrangement according to an angle-selective filter function. The filter function comprises a pass band (PB) with relatively high transmittance of intensity of incident radiation for angles of incidence smaller than a cut-off angle of incidence AOI CUT , and a stop band (SB) with relatively low transmittance of intensity of incident radiation for angles of incidence greater than the cut-off angle of incidence AOI CUT . The condition AOI CUT = arcsin (NA * | β | ) holds, with β being a magnification of an image formation between the field surface at or adjacent to the filter plane and the image surface of the projection objective.
    • 投影曝光系统包括被配置为接收工作波长λ的初级辐射的照明系统(ILL) 由主辐射源(S)产生并且形成主辐射以产生入射到提供规定图案(PAT)的掩模(M)上的照射辐射和投影物镜(P),投影物镜(PO)被配置为投影布置在 将投影物镜的物体表面(OS)放置在布置在像侧数值孔径NA处的投影物镜的图像表面(IS)中的辐射敏感衬底(W)上。 角度选择性滤光器布置(FA)布置在投影物镜的场表面或靠近物体表面光学下游的投影光束路径中。 角度选择滤波器装置可以根据角度选择滤波器的功能对入射到滤波器装置上的辐射进行滤波。 滤波器功能包括对入射角小于入射角AOICUT的入射辐射强度具有较高透射率的通带(PB),以及入射辐射强度相对较低透射率的阻带(SB) 对于入射角大于截止入射角AOICUT。 条件AOICUT = arcsin(NA * |ß|)成立,其中ß是在滤波器平面处或与滤光片平面相邻的场表面与投影物镜的图像表面之间的图像形成的放大率。