Optical: systems and elements – Lens – With field curvature shaping
Reexamination Certificate
2006-03-14
2006-03-14
Lester, Evelyn A. (Department: 2873)
Optical: systems and elements
Lens
With field curvature shaping
C359S649000, C359S726000, C359S753000, C359S682000, C359S784000, C359S740000
Reexamination Certificate
active
07012758
ABSTRACT:
A projection optical system includes from the enlargement side a first lens unit, a mirror which is an optical path bending member, a second lens unit, and a third lens unit. The projection optical system is designed so that a condition (1), 5.5<T12/FL<12.0, is fulfilled. Here, T12is the air equivalent distance between the first lens unit and the second lens unit, and FL is the overall focal length of the projection optical system. By fulfilling the condition (1), it is unnecessary that the diameter of the first lens unit be extremely large. It is also unnecessary to change the lens shape to prevent interference between the first lens unit and the second lens units, so that an increase in the cost of the projection optical system can be suppressed.
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Hayashi Kohtaro
Masubuchi Tomokazu
Sawamura Shigeru
Konica Minolta Opto Inc.
Lester Evelyn A.
Sidley Austin Brown & Wood LLP
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