Lens assembly

Abstract

The invention relates to a lens assembly, which sequentially includes a first lens with a positive refractive index and a second lens with a negative refractive index from the object side to the imaging side, and the first lens has a first convex surface facing the object side and a first concave surface towards the imaging side, the second lens has a second convex surface towards the object side and a second concave surface towards the imaging side, the first lens also has an aperture diaphragm, which is arranged on the first concave surface, wherein the definition f is the focal length of the lens assembly, f1 is the focal length of the first lens, f2 is the focal length of the second lens, D is the distance between the first lens and the second lens, TTL is the total length of the lens assembly, R1 is the first The curvature radius of the convex surface, R3 and R4 are the curvature radii of the second convex surface and the second concave surface respectively, Φ is the image circumference; then 0.01<|f / f2|<0.2; 0.1<R1 / f1<0.5; 0.8<f1 / TTL <1.1; 0.2<D / f<0.5; 0.3<R2 / Φ<0.7; and 0.03<(R3-R4) / (R3+R4)<0.3.

Description

【Technical field】 [0001] The invention relates to an imaging lens, in particular to a lens assembly with a two-piece structure, small size and aberration correction effect. 【Background technique】 [0002] In recent years, with the continuous evolution of digital imaging technology and electronic component manufacturing technology, digital imaging lenses can not only be used in related products of digital cameras, but also have become different portable electronic devices such as tablet computers, notebook computers or smart phones. Indispensable equipment in the device. [0003] At the same time, due to the increasingly miniaturized size of portable electronic devices, relatively, the size requirements for digital imaging lenses are becoming more and more stringent. As the production process of components (Charge-coupled Device, CCD) continues to improve, the size of imaging lenses such as CMOS or CCD in portable electronic devices can also be reduced accordingly. For examp...

AI Technical Summary

Problems solved by technology

[0004] In view of the above problems, the present invention is to provide a lens assembly with a two-piece structure, small size and aberration correction effect, so as to solve the problem that conventional imaging lenses cannot have both size and imaging quality

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