Optical image pickup lens with three lenses

Abstract

The invention discloses an optical image pickup lens with three lenses, which sequentially comprises an aperture diaphragm, a first lens, a second lens and a third lens from an object side to an image side along an optical axis. The first lens is a crescent lens with positive diopter. The second lens is provided with an object side surface and an image side surface which respectively provided with at least one point of reflection, arranged at the center facing the edge of the second lens. The third lens is provided with an object side surface and an image side surface respectively provided with at least one point of reflection, arranged at the center facing the edge of the third lens, wherein the third lens has the positive diopter at the position near the optical axis. The lens can be used for effectively correcting aberration so that the image pickup lens has high resolution; the length of the lens is effectively reduced; and the effects of small size and lower cost are achieved; therefore, the applicability of the image pickup lens is enhanced.

Description

technical field [0001] The present invention relates to a three-element optical imaging lens, especially an optical imaging lens for mobile phones or image sensors using CCD (Charge Coupled Device) or CMOS (Complementary Metal Oxide Semiconductor). Background technique [0002] With the advancement of technology, electronic products are constantly developing towards thinner, smaller and multi-functional, and electronic products such as: digital still camera (Digital Still Camera), computer camera (PC camera), network camera (Network camera), mobile phone (Mobile phones) and other devices already have imaging devices (lenses), and even devices such as personal digital assistants (PDAs) also have the need to add imaging devices (lenses); The device not only needs to have good image quality, but also needs to have a smaller volume and lower cost in order to effectively improve the applicability of the imaging device, especially for mobile phones. The above requirements or condi...

AI Technical Summary

Problems solved by technology

[0003] Since the traditional spherical ground glass lens has more material options and is more beneficial for correcting chromatic aberration, it has been widely used in the industry. angle) is relatively large, it is still difficult to correct aberrations such as spherical aberration and astigmatism; and in order to improve the above-mentioned shortcomings of the traditional spherical ground glass lens, the current imaging device has used an aspheric plastic lens or an aspheric lens. Spherical molded glass lens to obtain better imaging quality, such as US invention patents: US 2007 / 0091457, US 6,515,809, US 7,262,925, US 2007 / 0195432, US 2005 / 0128334, or Japanese patents JP 2007-121820, JP 2005 -352317, JP2004-163786, JP 2007-094113, JP 2005-338234JP 2007-047513, JP 2006-098976, etc., many pieces of optical imaging lens structure design including three-piece lens (lens elements); and the above-mentioned many inventions The differences or technical features between the structural designs of the patents are determined by the changes or combinations of the following factors: in each patent, the corresponding shape designs of the three lenses are different, such as the first, second, third, etc. The lenses are all meniscus shape lenses, or the first and second lenses are meniscus shape and the third lens is plano-concave shape or plano-convex shape; and / or each In one patent, the corresponding convex / concave directions of the three lenses are different. For example, the convex / concave surfaces of the first / second / third lenses can be arranged in various combinations such as the object side / image side; and / or each piece In the patent, the refractive power (refractive power) of the corresponding coordination between the three lenses is different, such as Japanese Patent No. 3717488, etc.

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