Projection optical system and projection and light exposure...

Details Projection optical system and projection and light exposure... Projection optical system and projection and light exposure...

2005-06-07

2005-06-07

Nguyen, Henry Hung (Department: 2851)

Photocopying

Projection printing and copying cameras

Illumination systems or details

C359S649000

Reexamination Certificate

active

06903804

ABSTRACT:
A projection optical system is disclosed that includes six lens groups, four of which are positioned in pairs symmetrically about a stop. The second and fifth lens groups, in order from the object side, may be positioned symmetrically about the stop but are also adjustable asymetrically about the stop in order to adjust the magnification of the projection optical system. The first and sixth lens groups, in order from the object side, function to make the projection optical system substantially telecentric on both the object side and the image side, respectively. Also disclosed is a projection and light exposure apparatus that uses the projection optical system of the present invention. The projection and light exposure apparatus automatically detects the image magnification and, based on the detection result, adjusts the positions of the second and fifth lens groups G2and G5as a unit so as to maintain a specified magnification.

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patent: 3026648 (2000-01-01), None

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