Photographing lens system
AssigneeLargan Precision Co., Ltd.
InventorsHsiang Chi Tang, Tsung Han Tsai
Life of this patent
Estimating the term…
Abstract
A photographing lens system including, in order from an object side to an image side: a first positive lens element having a convex object-side surface and a convex image-side surface; a second negative lens element, the object-side and image-side surfaces thereof being aspheric; a third lens element having a convex object-side surface and a concave image-side surface, the object-side and image-side surfaces thereof being aspheric and at least one of which being provided with at least one inflection point; and an aperture stop disposed between an imaged object and the second lens element; wherein there are three lens elements with refractive power.
Claims8
A photographing lens system comprising, in order from an object side to an image side:
- a first lens element with positive refractive power having a convex object-side surface and a convex image-side surface;
- a plastic second lens element with negative refractive power having a concave object-side surface and a convex image-side surface, the object-side and image-side surfaces thereof being aspheric;
- a plastic third lens element having a convex object-side surface and a concave image-side surface, the object-side and image-side surfaces thereof being aspheric and at least one of which being provided with at least one inflection point;
- and
- an aperture stop disposed between an imaged object and the second lens element;
- wherein there are three lens elements with refractive power;
- and wherein a focal length of the photographing lens system is f, a focal length of the first lens element is f1, an Abbe number of the first lens element is V1, an Abbe number of the second lens element is V2, an on-axis thickness of the second lens element is CT2, and they satisfy the relations:
- 1.28<f/f1<2.0, 30.5<V1−V2<46.0, 2.0<(CT2/f)*100<12.0, 0.10 [mm]<CT2<0.38 [mm].
Dependencies are inferred from the claim text.