Virtually distortion-free imaging system for large field, high resolution lithography
First Claim
Patent Images
1. A method for substantially distortion-free imaging of a reticle onto a wafer, comprising:
- imaging the reticle onto an encodable mask through a distortion producing imaging system in one direction;
patterning the reticle image onto the encodable mask to form an encoded mask;
replacing the reticle with a wafer at the same position;
imaging the encoded mask back through the distortion producing imaging system in the opposite direction onto the wafer.
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Abstract
Virtually distortion free large field high resolution imaging is performed using an imaging system which contains large field distortion or field curvature. A reticle is imaged in one direction through the optical system to form an encoded mask. The encoded mask is then imaged back through the imaging system onto a wafer positioned at the reticle position.
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Citations
10 Claims
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1. A method for substantially distortion-free imaging of a reticle onto a wafer, comprising:
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imaging the reticle onto an encodable mask through a distortion producing imaging system in one direction; patterning the reticle image onto the encodable mask to form an encoded mask; replacing the reticle with a wafer at the same position; imaging the encoded mask back through the distortion producing imaging system in the opposite direction onto the wafer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification