Projection lenses for use with large pixelized panels
AssigneeU.S. Precision Lens Incorporated
InventorMelvyn H. Kreitzer
Life of this patent
Estimating the term…
Abstract
A projection lens for use with LCD panels is provided. The lens has a first lens unit which has a positive power and a second lens unit which has a negative power. The first lens unit contains at least four lens elements, namely, a positive first lens element, a negative second lens element which is composed of a high dispersion material, a third lens element of weak optical power, and a positive fourth lens element of strong optical power. The projection lens achieves a correction of chromatic aberration on the order of about a quarter of pixel for large LCD panels having pixels on the order of 200 microns.
Claims21
A projection lens for forming an image of an object, said lens consisting in order from its image end to its object end of:
- (A) a first lens unit having a positive power and comprising in order from the image side to the object side:
- (i) a positive lens element;
- (ii) a negative lens element;
- (iii) a lens element of weak optical power;
- and
- (iv) a positive lens element of strong optical power;
- and
- (B) a second lens unit having a negative power;
- wherein:
- (a) the first lens unit and the second lens unit have a combined optical power P.sub.0 ;
- (b) the positive lens element of strong optical power has a power P.sub.E4 ;
- and
- (C) P.sub.E4 >1.5.multidot.P.sub.0.
A projection lens system for forming an image of an object, said system comprising:
- (a) an illumination system comprising a light source and illumination optics which forms an image of the light source, said image of the light source being the output of the illumination system;
- (b) a pixelized panel which comprises the object;
- and
- (c) a projection lens which forms the image of the object, said lens comprising in order from its image end to its object end:
- (A) a first lens unit having a positive power and comprising in order from the image side to the object side:
- (i) a positive lens element;
- (ii) a negative lens element;
- (iii) a lens element of weak optical power;
- and
- (iv) a positive lens element of strong optical power;
- and
- (B) a second lens unit having a negative power.
A projection lens for forming an image of an object, said lens consisting in order from its image end to its object end of:
- (A) a first lens unit having a positive power and comprising in order from the image side to the object side:
- (i) a positive lens element;
- (ii) a negative lens element;
- (iii) a lens element of weak optical power;
- and
- (iv) a positive lens element of strong optical power;
- and
- (B) a second lens unit having a negative power;
- wherein the lens has a distortion which is less than about one percent at the image.
A projection lens for forming an image of an object, said lens consisting in order from its image end to its object end of:
- (A) a first lens unit having a positive power and consisting in order from the image side to the object side of:
- (i) a positive lens element;
- (ii) a negative lens element;
- (iii) a lens element of weak optical power;
- and
- (iv) a positive lens element of strong optical power;
- and
- (B) a second lens unit having a negative power.
A projection lens system for forming an image of an object, said system comprising:
- (a) an illumination system comprising a light source and illumination optics which forms an image of the light source, said image of the light source being the output of the illumination system;
- (b) a pixelized panel which comprises the object;
- and
- (c) a projection lens which forms the image of the object, said lens consisting in order from its image end to its object end of:
- (A) a first lens unit having a positive power and comprising in order from the image side to the object side:
- (i) a positive lens element;
- (ii) a negative lens element;
- (iii) a lens element of weak optical power;
- and
- (iv) a positive lens element of strong optical power;
- and
- (B) a second lens unit having a negative power.
Dependencies are inferred from the claim text.