Method and apparatus for correcting gravitational sag in...

Details Method and apparatus for correcting gravitational sag in... Method and apparatus for correcting gravitational sag in...

2007-07-03

2007-07-03

Mathews, Alan (Department: 2851)

Photocopying

Projection printing and copying cameras

Detailed holder for original

C355S053000, C355S076000

Reexamination Certificate

active

11161215

ABSTRACT:
In a projection apparatus for projecting optical images, an optical mask support stage having a pair of separated arms. Each arm being provided with a respective mask chucking bar that supports a respective edge of a thin glass mask and applies to the respective edge a bending moment away from the center of the mask to reduce or eliminate any gravitational induced sag in the center of the mask thereby improving the quality of the images projected by the apparatus.

REFERENCES:
patent: 6069931 (2000-05-01), Miyachi et al.
patent: 6459474 (2002-10-01), Okada
patent: 6480260 (2002-11-01), Donders et al.

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