Projection optical system

Details Projection optical system Projection optical system

2011-08-30

2011-08-30

Harrington, Alicia M (Department: 2873)

Optical: systems and elements

Lens

Telecentric system

C359S649000

Reexamination Certificate

active

08009365

ABSTRACT:
The projection optical system uses a plurality of wavelengths or a wavelength band within a wavelength range from a visible region to a near ultraviolet region. The double-telecentric projection optical system includes: a first lens group with a positive power; a second lens group with a negative power, including a predetermined lens or lenses; and a third lens group with a positive power, including a stop and at least two positive lenses satisfying a predetermined condition relating to refractive index. The projection optical system satisfies a predetermined condition relating to a composite focal length of the first lens group and the second lens group, and a focal length of the third lens group.

REFERENCES:
patent: 5159496 (1992-10-01), Kataoka
patent: 5905596 (1999-05-01), Watanabe
patent: 2002-14281 (2002-01-01), None
patent: 2004-354805 (2004-12-01), None

Affiliated with

Also associated with

Rating

Projection optical system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Projection optical system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Projection optical system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2630553