Zoom lens and projector unit

Details Zoom lens and projector unit Zoom lens and projector unit

2007-07-17

2009-06-09

Mack, Ricky L (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S680000

Reexamination Certificate

active

07545581

ABSTRACT:
To provide a compact, high-performance zoom lens having a small lens aperture for enlarging an image from a light valve such as a DMD for forming an image by changing a reflecting direction of light and projecting the image so enlarged on to a screen or the like, and a zoom lens so provided includes, in order from a magnifying side, a first lens group having a negative refractive power as a whole, a second lens group having a positive refractive power as a whole, and a third lens group having a positive refractive power as a whole, wherein changing the magnification of a whole lens system thereof is attained by configuring such that while a magnification varying operation is in effect, the third lens group is left fixed, the first lens group and the second lens group are made to move on the optical axis.

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“Digital Micromirror Device” downloaded from Wikipedia, the free encyclopedia, http://en.wikipedia.org/wiki/digital—micromirror—device., downloaded Jan. 3, 2008, 2 pages.
“DMD (Digital Micro-Mirror Device)”, About.com: Home Theater http://hometheater.about.com/od/televisionbasics/g/dmddef.htm?p=1, downloaded Jan. 3, 2008, 1 page.
“Thefreedictionary.com” Digital micromirror device—encyclopedia article about Digital micr . . . http://encyclopedia.thefreedictionary.com/p.Digital+micromirror+device, downloaded Jan. 3, 2008, 2 pages.

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