Optical unit, exposure unit and optical devices

Details Optical unit, exposure unit and optical devices Optical unit, exposure unit and optical devices

2006-05-23

2006-05-23

Ben, Loha (Department: 2873)

Optical: systems and elements

Lens

With support

C359S822000, C359S811000

Reexamination Certificate

active

07050247

ABSTRACT:
In an optical unit having a holding structure which brings a junk ring or the like into contact with an optical surface of a lens, the optical surface suffers from a serious elastic deformation leading to deterioration of optical performance. Upon holding the lens, therefore, a face other than the optical surface is provided on the lens so that the lens is held by applying a force to the face from element holding members.

REFERENCES:
patent: 5973333 (1999-10-01), Nakasuji et al.
patent: 6400516 (2002-06-01), Spinali
patent: 6525688 (2003-02-01), Schletterer

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