Optical: systems and elements – Lens – With field curvature shaping
Reexamination Certificate
2007-09-25
2007-09-25
Thompson, Timothy (Department: 2873)
Optical: systems and elements
Lens
With field curvature shaping
C359S651000
Reexamination Certificate
active
11358074
ABSTRACT:
Off-axis projection optics that includes first and second mirrors positioned off-axis and sharing a confocal point that are arranged to reduce linear astigmatism. If a distance between an object plane and the first mirror is l1, an incident angle of light coming from the object plane to the first mirror is i1, a distance between the first mirror and the confocal point is l1′, a distance between the confocal point and the second mirror is l2, an incident angle of light coming from the first mirror to the second mirror is i2, and a distance between the second mirror and an image plane is l2′, the off-axis projection optics may satisfy the following equation:l1′+l1l1tani1=l2′+l2l2tani2.
REFERENCES:
patent: 5063586 (1991-11-01), Jewell et al.
patent: 6710917 (2004-03-01), Mann et al.
patent: 6860610 (2005-03-01), Terasawa
Chang Seung-Hyuk
Kim Hoon
Kim Suk-Pil
Kim Won-Joo
Song I-Hun
Harness & Dickey & Pierce P.L.C.
Hasan M.
Thompson Timothy
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