Projection objective having adjacently mounted aspheric lens...

Details Projection objective having adjacently mounted aspheric lens... Projection objective having adjacently mounted aspheric lens...

2005-06-07

2005-06-07

Nguyen, Henry Hung (Department: 2851)

Photocopying

Projection printing and copying cameras

Illumination systems or details

C355S053000, C359S649000

Reexamination Certificate

active

06903802

ABSTRACT:
A projection objective has at least five lens groups (G1to G5) and has several lens surfaces. At least two aspheric lens surfaces are arranged so as to be mutually adjacent. These mutually adjacently arranged lens surfaces are characterized as a double asphere. This at least one double asphere (21) is mounted at a minimum distance from an image plane (0′) which is greater than the maximum lens diameter (D2) of the objective.

REFERENCES:
patent: 5999331 (1999-12-01), Yamamoto
patent: 6166864 (2000-12-01), Horiuchi
patent: 6451507 (2002-09-01), Suenaga et al.
patent: 6452723 (2002-09-01), Suenaga et al.
patent: 6560031 (2003-05-01), Shafer et al.
patent: 6646797 (2003-11-01), Suenaga et al.
patent: 6707601 (2004-03-01), Suenaga et al.
patent: 6791761 (2004-09-01), Shafer et al.
patent: 2004/0150878 (2004-08-01), Omura

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