Projection lens and projection system having same

Details Projection lens and projection system having same Projection lens and projection system having same

2011-04-12

2011-04-12

Choi, William C (Department: 2873)

Optical: systems and elements

Lens

With field curvature shaping

C359S649000

Reexamination Certificate

active

07924508

ABSTRACT:
A projection lens includes, in the order from a large conjugate side to a small conjugate side thereof, a negative lens group having a negative refractive power and a positive lens group having a positive refractive power. The positive lens group includes, in the order from the large conjugate side to the small conjugate side of the projection lens, a front sub-group and a rear sub-group each having a positive refractive power. The projection lens satisfies the formulas: −1.35<F1/F<−0.35 and 3<F24/F<5, where F1, F24, and F correspondingly represent the effective focal lengths of the negative lens group, the rear sub-group, and the projection lens.

REFERENCES:
patent: 5519537 (1996-05-01), Shikama
patent: 101387736 (2009-03-01), None

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