Optical unit, exposure unit and optical devices

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

2007-02-27

2007-02-27

Dinh, Jack (Department: 2873)

Optical: systems and elements

Lens

With support

C359S811000, C359S819000, C359S822000

Reexamination Certificate

active

11398592

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: 5249082 (1993-09-01), Newman
patent: 5973333 (1999-10-01), Nakasuji et al.
patent: 6400516 (2002-06-01), Spinali
patent: 6525888 (2003-02-01), Schletter
patent: 6791771 (2004-09-01), Kanematsu et al.
patent: 6878042 (2005-04-01), Oshino

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