Lens assembly

Abstract

The invention relates to a lens assembly. The lens assembly includes a first lens having a positive refractive index and a second lens having a negative refractive index in sequence from an object side to an imaging side, the first lens has a first convex surface towards the object side and a first concave surface towards the imaging side, the second lens has a second convex surface toward the object side and a second concave surface towards the imaging side, the first lens has an aperture diaphragm arranged on the first concave surface, f is defined as the focal length of the lens assembly, f1 is defined as the focal length of the first lens, f2 is defined as the local length of the second lens, D is defined as the distance between the first lens and the second lens, TTL is defined as the total length of the lens assembly, R1 is defined as the radius of curvature of the first convex surface, R3 and R4 are defined as the radii of curvature of the second convex surface and the second concave surface respectively, and phi is defined as the circumference of an image, 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 / phi<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, correspondingly, the size requirements for digital imaging lenses are becoming more and more stringent. As the production process of components such as 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 accordingl...

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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