Compact lens system
AssigneeAsia Optical Co., Inc.
InventorsChun-Hong Chen, Shu-Hung Lin
Life of this patent
Estimating the term…
Abstract
A compact lens system includes a first positive lens element (1) on the object side and a second negative lens element (2) on the image side. The first positive lens element is a meniscus lens having a convex surface (11) facing the object side. The second negative lens element is also a meniscus lens having a convex surface (12) facing the image side. Both of the first and second lens elements are aspheric lenses each having at least one aspheric surface. The first and second lens elements are made of different plastic materials and are symmetrically arranged with respect to each other along the optical axis.
Claims20
A compact lens system comprising a first lens element on the object side and a second lens element on the image side, the first and second lens elements having opposite refractive power, the first lens element having a first convex surface facing the object side and an opposite first concave surface on the image side, at least one of the first convex and concave surfaces being aspheric, the second lens element having a second convex surface facing the image side and an opposite second concave surface on the object side, at least one of the second convex and concave surfaces being aspheric, said compact lens system having no more than two lens elements.
A compact lens system comprising:
- a first meniscus lens element having a first convex surface facing the object side and an opposite first concave surface on the image side, at least one of the first convex and concave surfaces being aspheric;
- and
- a second meniscus lens element having a second convex surface facing the image side and an opposite second concave surface facing the first concave surface of the first meniscus lens element, at least one of the second convex and concave surfaces being aspheric;
- wherein
- said compact lens system has no more than two lens elements, and the first and second lens elements have opposite refractive power and satisfy the following condition:
- 3.2
- <
- -
- f
- 2
- f
- 1
- <
- 3.6
- where, f1 represents the focal length of the first meniscus lens element, and f2 represents the focal length of the second meniscus lens element.
A compact lens system comprising:
- a first positive lens element of a meniscus type disposed on the object side, the first positive lens element having a first convex surface facing the object side and an opposite first concave surface on the image side, at least one of the first convex and concave surfaces being aspheric;
- and
- a second negative lens element of a meniscus type disposed on the image side, the second negative lens element having a second convex surface facing the image side and an opposite second concave surface on the object side, at least one of the second convex and concave surfaces being aspheric;
- wherein
- the first and second lens elements are made of different materials having considerably different refractive indices, and said compact lens system has no more than two lens elements.
Dependencies are inferred from the claim text.