Imaging lens
AssigneeYoung Optics Inc.
InventorsYing-Hsiu Lin, Chia-Chen Kung, Ching-Lung Lai
Life of this patent
Estimating the term…
Abstract
An imaging lens includes a first lens group and a second lens group. The first lens group includes three lenses with refractive powers, where two of three lenses of the first lens group are aspheric lenses. The second lens group includes three lenses with refractive powers, where one of three lenses is an aspheric lens and other two lenses are paired to form a doublet lens. The imaging lens satisfies conditions of 3.0<LT/IMH<3.5 and 1.0<D1/LT<1.08, where IMH is a semi-diagonal image height of the imaging lens, D1 is a lens diameter of a lens closest to an object side of the imaging lens, and LT is a distance measured along an optical axis between two outermost lens surfaces with refractive powers at opposite ends of the imaging lens.
Claims20
An imaging lens, comprising:
- a first lens group comprising three lenses with refractive powers, wherein two of three lenses of the first lens group are aspheric lenses;
- and
- a second lens group comprising three lenses with refractive powers, wherein one of three lenses of the second lens group is an aspheric lens, other two lenses of the three lenses of the second lens group are paired to form a doublet lens, and the first lens group and the second lens group are divided from each other by an aperture stop;
- wherein the imaging lens comprises six lenses with refractive powers, comprises at least two plastic lenses, and satisfies conditions of 3.0<LT/IMH<3.5 and 1.0<D1/LT<1.08, where IMH is a semi-diagonal image height of the imaging lens, D1 is a lens diameter of a lens closest to an object side of the imaging lens, and LT is a distance measured along an optical axis between two outermost lens surfaces with refractive powers at opposite ends of the imaging lens.
An imaging lens, comprising:
- a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens with refractive powers arranged in order from an object side to an image side of the imaging lens, wherein the second lens, the third lens, the fifth lens and the sixth lens are aspheric lenses, the fifth lens and the sixth lens are paired to form a doublet lens, the first lens is closest to the object side among all lenses of the imaging lens, the sixth lens is closest to the image side among all lenses of the imaging lens, and the imaging lens satisfies conditions of 3.0<LT/IMH<3.5 and 1.0<D1/LT<1.08, where IMH is the semi-diagonal image height, D1 is a diameter of the first lens, LT is a length measured along an optical axis of the imaging lens from an object-side surface of the first lens to an image-side surface of the sixth lens.
Dependencies are inferred from the claim text.