Zoom lens and projector using zoom lens

Details Zoom lens and projector using zoom lens Zoom lens and projector using zoom lens

2007-07-25

2009-06-16

Mack, Ricky L (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S686000

Reexamination Certificate

active

07548379

ABSTRACT:
To provide a high performance compact zoom lens with a small lens aperture which projects an image from a light bulb such as a DMD in which an image is formed by changing reflecting directions of light on to a screen or the like in an enlarged fashion, according to the invention, there is provided zoom lens comprising, in order from a magnifying side thereof, a first lens group having a negative refractive power as a whole, a second lens group having a positive or negative refractive power as a whole and a third lens group having a positive refractive power as a whole, wherein changing the magnification of the whole lens system thereof is attained by configuring such that the first lens group and the second lens group are made to move on an optical axis in such a manner as to move in a direction from a magnifying side to a contracting side over a range from a wide angle end to an intermediate area and to move in a direction from the contracting side to the magnifying side over a range from the intermediate area to a telephoto end, and the third lens group is made to move on the optical axis in such a manner as to move in a direction from the contracting side to the magnifying side over a range from the wide angle end to the telephoto end.

REFERENCES:
patent: 5325236 (1994-06-01), Tanaka
patent: 5386320 (1995-01-01), Takada
patent: 5644433 (1997-07-01), Ikari
patent: 6016228 (2000-01-01), Uzawa
patent: 6246529 (2001-06-01), Sensui
patent: 6606201 (2003-08-01), Hirose
patent: 04-275515 (1992-10-01), None
patent: 05-134181 (1993-05-01), None
patent: 2001-131611 (2000-05-01), None
patent: 2004-271668 (2004-09-01), None

Affiliated with

Also associated with

Rating

Zoom lens and projector using zoom lens does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Zoom lens and projector using zoom lens, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Zoom lens and projector using zoom lens will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4065429