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Optical lens with short overall length

An optical lens and optical lens technology, applied in the field of optical lenses, can solve the problems of not being light, thin and short, and achieve the effects of reducing aspherical surfaces, improving imaging quality, and resisting impact.

Active Publication Date: 2009-01-14
BYD SEMICON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is far from meeting the requirements of today's digital products, which are light, thin and short

Method used

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  • Optical lens with short overall length
  • Optical lens with short overall length
  • Optical lens with short overall length

Examples

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Embodiment Construction

[0031] Please refer to Figure 1 to Figure 4 , a short overall length optical lens, including a diaphragm 50, an optical lens group and transparent parallel plates 4,40. The optical lens group includes a first lens 1,10, a second lens 2,20 and a third lens 3,30, the first lens 1,10, the second lens 2,20 and the third lens 3,30 Arranged symmetrically along the optical axis from the object plane to the image plane. The surface of the first lens 1, 10 is a biconvex aspheric surface, the surface of the second lens 2, 20 is an aspheric surface with negative diopter, and the surface of the third lens 3, 30 is an aspheric surface with undulating shape. sphere.

[0032] In order to clearly illustrate the present invention, two implementations of the short total length optical lens are illustrated in the specific implementation manner.

[0033] Please refer to figure 1 , shows the first embodiment of the short overall length optical lens, the optical lens includes a fixed diaphragm...

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Abstract

The invention relates to a short total-length optical lens, comprising an optical lens unit which includes a first lens, a second lens and a third lens which are symmetrical along an optical axis from an object face to an image face. The surface of the first lens appears as a double-convex aspheric surface and the surface of the second lens is an aspheric surface with the negative dioptre and the surface of the third lens is an aspheric surface with an undulating shape. The invention adopts the full aspheric surface design and corrects various aberrations by optimizing the aspheric coefficients so as to avoid the sphere aberrations caused by adopting spherical lenses and enhance the imaging quality. Simultaneously, a ratio between the length of the optical lens of the invention and a focal length is less than 1.24, which is far less than the parameters of other similar three-lens structures; Under the condition of reaching the same image height, the optical lens of the invention can obtain a shorter lens length so as to lead the optical lens to be slimmer and shorter.

Description

technical field [0001] The present invention relates to an optical lens, in particular to an optical lens equipped with CCD (Charge Coupled Device), CMOS (Complementary Metal Oxide Semiconductor) and other imaging devices, suitable for small digital camera systems, the overall length of the optical lens is very short, suitable for Ultra-thin digital equipment, such as digital cameras, high-pixel mobile phone camera modules and other systems. Background technique [0002] Optical imaging lens is an important component of digital imaging equipment, and the imaging quality of the lens directly determines the imaging performance of the imaging system. In recent years, digital products have been continuously updated, and they are increasingly developing in the direction of thinner, lighter and smaller. Therefore, there are higher and higher requirements for optical lenses equipped in digital imaging equipment. For example, excellent imaging quality is required, and the resoluti...

Claims

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Application Information

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IPC IPC(8): G02B13/00G02B13/18G02B9/12G02B1/04
Inventor 姜莉莉
Owner BYD SEMICON CO LTD
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