COMPACT IMAGING LENS SYSTEM
First Claim
1. A compact imaging lens system comprising, in order from the object side to the image side, a first lens of negative refractive power, a free-form surface prism of positive refractive power and a second lens of positive refractive power, the free-form surface prism having an incidence surface, a reflection surface and an exit surface, the first lens being disposed on the side of the incidence surface of the free-form surface prism, the second lens being disposed on the side of the exit surface of the free-form surface prism.
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Accused Products
Abstract
A compact imaging lens system includes, in order from the object side to the image side, a first lens (1) of negative refractive power, a free-form surface prism (2) of positive refractive power and a second lens (3) of positive refractive power. The free-form surface prism has an incidence surface (S3), a reflection surface (S4) and an exit surface (S5). The first lens is disposed on the side of the incidence surface, and the second lens is disposed on the side of the exit surface. The free-form surface prism functions equivalent to a right-angle prism with aspheric surfaces.
13 Citations
20 Claims
- 1. A compact imaging lens system comprising, in order from the object side to the image side, a first lens of negative refractive power, a free-form surface prism of positive refractive power and a second lens of positive refractive power, the free-form surface prism having an incidence surface, a reflection surface and an exit surface, the first lens being disposed on the side of the incidence surface of the free-form surface prism, the second lens being disposed on the side of the exit surface of the free-form surface prism.
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15. A compact imaging lens system comprising, in order from the object side to the image side, a first lens of negative refractive power, a free-form surface prism of positive refractive power and a second lens of positive refractive power, the first lens, the free-form surface prism and the second lens satisfying the following conditions:
1.3<
|f1/f|<
2.3;
2.5<
f2/f<
5.0;
2.5<
f3/f<
4.0,where f represents the effective focal length of the compact imaging lens system, and f1, f2 and f3 represent the effective focal lengths of the first lens, the free-form surface prism and the second lens, respectively. - View Dependent Claims (16, 17, 18, 19, 20)
Specification