Mobile device and optical imaging lens thereof
AssigneeGenius Electronic Optical Co., Ltd.
InventorsShih Han Chen, Chung Chih Chang, Hung Chien Hsieh
Life of this patent
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Abstract
Present embodiments provide for a mobile device and an optical imaging lens thereof. The optical imaging lens comprises four lens elements positioned sequentially from an object side to an image side. Though controlling the convex or concave shape of the surfaces, the refracting power and/or the ratio or difference among the parameters of the lens element(s), the optical imaging lens shows better optical characteristics and the total length of the optical imaging lens is shortened.
Claims20
An optical imaging lens, sequentially from an object side to an image side, comprising an aperture stop, first, second, third and fourth lens elements, each of said first, second, third and fourth lens elements having an object-side surface facing toward the object side and an image-side surface facing toward the image side, wherein:
- said first lens element has positive refracting power, and said image-side surface thereof is a convex surface;
- said second lens element has negative refracting power, and said image-side surface thereof is a concave surface;
- said third lens element has positive refracting power, said object-side surface thereof is a concave surface, and said image-side surface thereof is a convex surface;
- said object-side surface of said fourth lens element comprises a convex portion in a vicinity of the optical axis and a concave portion in a vicinity of a periphery of the fourth lens element;
- said optical imaging lens as a whole has only the four lens elements having refracting power;
- and
- the sum of the thickness of all four lens elements along the optical axis is ALT, an air gap between the first lens element and the second lens element along the optical axis is AGL12, and ALT and AGL12 satisfy the equation:
- ALT/AGL12≦36.
Dependencies are inferred from the claim text.