Projection lens with high resolution and reduced overall length
AssigneeHon Hai Precision Industry Co., Ltd.
InventorChun-Ling Lin
Life of this patent
Estimating the term…
Abstract
An exemplary projection lens includes, in this order from the magnification side to the minification side thereof, a negative lens group of negative fraction power, and a positive lens group of positive fraction power. The projection lens satisfies the formulas of: −2.5<F1/F<−1.5; and 1.3<F2/F<1.5, where F1, F2, and F respectively represent the effective focal lengths of the negative lens group, the positive lens group, and the projection lens.
Claims17
An projection lens comprising, in this order from the magnification side to the minification side thereof, a negative lens group having negative refraction power, and a positive lens group having positive refraction power, wherein the projection lens satisfies the formulas of:
- −2.5<F1/F<−1.5;
- and 1.3<F2/F<1.5, where F1, F2, and F respectively represent the effective focal lengths of the negative lens group, the positive lens group, and the projection lens, wherein the negative lens group comprises, in order from the magnification side to the minification side of the projection lens, a first lens of negative refraction power, a positive lens of positive refraction power, a third lens of negative refraction power, and a fourth lens of positive refraction power.
An projection lens comprising, in this order from the magnification side to the minification side thereof, a negative lens group having negative fraction power, and a positive lens group having positive fraction power, wherein the projection lens satisfies the formulas of:
- −2.5<F1/F<−1.5, 1.3<F2/F<1.5, and 0.24<D12/F<0.5 where F1, F2, and F respectively represent the effective focal lengths of the negative lens group, the positive lens group, and the projection lens, and D12 is the distance between the negative lens group and the positive lens group on the optical axis of the projection lens.
A projection lens comprising, in this order from the magnification side to the minification side thereof,
- a negative lens group having negative fraction power, and
- a positive lens group having positive fraction power, comprising, in this order from the magnification side to the minification side of the projection lens,
- a first lens of positive refraction power,
- a second lens of negative refraction power,
- a third lens of positive refraction power, and
- a fourth lens of positive refraction power;
- wherein the projection lens satisfies the formulas of:
- −2.5<F1/F<−1.5;
- and 1.3<F2/F<1.5, where F1, F2, and F respectively represent the effective focal lengths of the negative lens group, the positive lens group, and the projection lens.
Dependencies are inferred from the claim text.