Small optical lens with high resolving power

Abstract

The invention provides a small optical lens with high resolving power, comprising a lens group, wherein the lens group comprises a first lens, a second lens and a third lens which are coaxially and sequentially arrayed from an object space to an image space; the first lens is an aspheric biconvex lens with a positive refractive index and comprises a first aspheric surface and a second aspheric surface which are projected to the object space; the second lens is an aspheric negative lens with negative diopter and comprises a third aspheric surface and a fourth aspheric surface; the third aspheric surface is a concave surface, the fourth aspheric surface is a convex surface, and the third aspheric surface is opposite to the second aspheric surface; the third lens is an aspheric positive lens with positive diopter and comprises a fifth aspheric surface and a sixth aspheric surface, the fifth aspheric surface is a convex surface, the sixth aspheric surface is a concave surface, and the fifth aspheric surface is opposite to the fourth aspheric surface. The structure of each lens of the small optical lens with high resolving power can effectively inhibit stray light, and the total height of the lens can be effectively reduced through the arrangement of the structure and the arraying mode of the lenses so as to obtain high imaging quality.

Description

【Technical Field】 [0001] The invention relates to a digital camera product, in particular to a small-sized optical lens for high-resolution imaging. 【Background technique】 [0002] In digital imaging equipment, the optical imaging lens is a particularly important component, and the image quality of the lens directly determines the imaging performance of the digital imaging equipment. Digital products are constantly being updated, and they are becoming lighter, thinner, shorter and smaller. Therefore, there are higher and higher requirements for optical lenses equipped in digital imaging equipment. Especially in lens modules with more than one million pixels, in order to ensure high imaging quality and brightness, it is necessary to reduce the exit angle. The digital imaging system requires a larger space to refract light, so a structure composed of 3-4 lenses is often used. , Making the total height of digital imaging equipment generally above 5mm. For example, three plastic asph...

AI Technical Summary

Problems solved by technology

[0003] For example, for a digital product that emphasizes the small size of the lens group, when it is adapted to a 1/4-inch display, the total lens height will still reach 5.3mm. In this case, every 0.1mm reduction in the total height will cause great damage to the image quality. And it will inevitably increase stray ligh

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