Optical: systems and elements – Lens – With variable magnification
Reexamination Certificate
2007-07-10
2007-07-10
Spector, David N. (Department: 2873)
Optical: systems and elements
Lens
With variable magnification
C359S651000, C359S679000
Reexamination Certificate
active
10980962
ABSTRACT:
An ultra wide angle zoom lens for a projection display system including a liquid crystal panel displaying an image; a second lens group having a positive refractive power, formed by combination of two or more lenses, and correcting chromatic and spherical aberrations of incident light from the liquid crystal panel; a total reflection mirror reflecting the incident light from the second lens group in a predetermined direction; and a first lens group having a negative refractive power, formed by combination of two or more lenses, and correcting distortion and astigmatism of the incident light from the total reflection mirror. Here, a projection lens is constructed so that a magnification of the projection lens is adjusted by movement of the second lens group along an optical axis, and the first lens group is moved forward and backward according to the adjusted magnification of the projection lens so that lens focusing can be adjusted.
REFERENCES:
patent: 5442484 (1995-08-01), Shikawa
patent: 5671993 (1997-09-01), Shikama
patent: 5745297 (1998-04-01), Kaneko et al.
patent: 6760162 (2004-07-01), Yeo
Lee Hong Degerman Kang & Schmadeka
LG Electronics Inc.
Spector David N.
LandOfFree
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