Projection lens system
AssigneeHon Hai Precision Industry Co., Ltd.
InventorsKuang-Ju Wang, Chun-Hsiang Huang
Life of this patent
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Abstract
An exemplary projection lens system includes, in the order from the magnification side to the reduction side thereof, a first lens with a negative refractive power, a second lens with a positive refractive power, a lens group with a negative refractive power, and a third lens with a positive refractive power. The projection lens system satisfies the formula 0.3<|f1/f(2-4)|<1.0, where f1 is a focal length of the first lens, f(2-4) is an effective focal length of the second lens, the lens group and the third lens.
Claims17
A projection lens system comprising, in the order from the magnification side to the reduction side thereof, a first lens with a negative refractive power, a second lens with a positive refractive power, a lens group with a negative refractive power, and a third lens with a positive refractive power, wherein the projection lens system satisfies the formula 0.3<|f1/f(2-4)|<1.0, where f1 is a focal length of the first lens, f(2-4) is an effective focal length of the second lens, the lens group and the third lens.
A projection system, comprising:
- a body;
- a projection lens system, mounted in the body, comprising, in the order from the magnification side to the reduction side thereof:
- a first lens with a negative refractive power;
- a second lens with a positive refractive power;
- a lens group with a negative refractive power;
- and
- a third lens with a positive refractive power, wherein the projection lens system satisfies the formula 0.3<|f1/f(2-4)|<1.0, where f1 is a focal length of the first lens, f(2-4) is an effective focal length of the second lens, the lens group and the third lens;
- a prism placed at the reduction side of the third lens;
- and
- a spatial light modulator placed at the reduction side of the prism.
Dependencies are inferred from the claim text.