Optical: systems and elements – Lens – With field curvature shaping
Reexamination Certificate
2005-11-01
2005-11-01
Schwartz, Jordan M. (Department: 2873)
Optical: systems and elements
Lens
With field curvature shaping
C359S754000
Reexamination Certificate
active
06961186
ABSTRACT:
Improvements in the fabrication of integrated circuits are driven by the decrease of the size of the features printed on the wafers. Current lithography techniques limits have been extended through the use of phase-shifting masks, off-axis illumination, and proximity effect correction. More recently, liquid immersion lithography has been proposed as a way to extend even further the limits of optical lithography. This invention described a methodology based on contact printing using a projection lens to define the image of the mask onto the wafer. As the imaging is performed in a solid material, larger refractive indices can be obtained and the resolution of the imaging system can be increased.
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Pierrat Christophe
Wong Alfred Kwok-Kit
Milks, III William C.
Russo & Hale LLP
Schwartz Jordan M.
Takumi Technology Corp.
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