Miniature optical lens

Abstract

The invention discloses a miniature optical lens which is characterized by comprising a lens group, the lens group sequentially comprises a first lens, a second lens and a third lens from an object side to an image side, the first lens has positive focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a convex surface; the second lens has negative focal power, wherein the object side surface is a concave surface and the image side surface is a concave surface; the third lens has positive focal power, the object side surfaceof the third lens is a convex surface, and the image side surface is a convex surface; the field angle range of the lens group satisfies the following formula. 55 degrees < = FOV < = 62 degrees; the lens group satisfies a conditional expression: 0.85 < = (R1 + R2) / (R1-R2) < = 2, wherein R1 is the curvature radius of the first lens, R2 is the curvature radius of the second lens. The lens is small in distortion, high in resolution and narrow in field angle, imaging quality in a narrow and insufficient-light environment is guaranteed, imaging of a long-distance target is clear, and the lens has the advantages of being small in size and high in imaging quality and has good adaptability to different devices.

Description

technical field [0001] The invention relates to the technical field of optical lenses, in particular to a miniature optical lens. Background technique [0002] As the requirements for the use of optical lenses are getting higher and higher, especially the miniaturization of optical lenses, such as speculum lenses in the medical field, they not only have requirements for miniaturization and light weight, but also need to be used in narrow and poorly lit environments. Therefore, this kind of micro-optical lens needs to have a narrow field of view, while the optical lens group in the prior art is relatively thick and cannot meet the above-mentioned requirements. Contents of the invention [0003] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a micro-optical lens, which reduces the overall volume and ensures the imaging effect. [0004] The above-mentioned technical purpose of the present invention is achieved by the followin...

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Problems solved by technology

[0002] As the requirements for the use of optical lenses are getting higher and higher, especially the miniaturization of optical lenses, such as speculum lenses in the medical field, they not only have requirements for miniaturization and light weight, but also need to be used in narrow and poorly lit environments. Therefore, this kind of miniature optical lens needs to have a narrow field of view, while the optical lens group in the prior art is relatively thick and cannot meet the above requirements

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