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Imaging optical lens system

By optimizing the curvature and focal length relationship of the three lenses, the problems of poor imaging quality and too long overall length of the existing optical system lens are solved, and a miniaturized and efficient imaging optical system lens design is achieved, which is suitable for thin, light and portable applications. equipment.

Active Publication Date: 2013-11-13
LARGAN PRECISION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As disclosed in U.S. Patent No. US7,957,076B2, in order to reduce the manufacturing cost, the common optical system mainly adopts two-piece lens structure. Advanced Optical System Requirements
On the other hand, the four-piece lens group disclosed in U.S. Patent No. US8,089,704B2 often limits the degree of miniaturization due to the excessive number of lens configurations, and its cost and complexity of manufacturing and assembly are also relatively high. higher
In addition, such as the three-piece lens group disclosed in US Patent No. US8,094,231B2, the astigmatism around the design of the image will cause the problem of defocus (Defocus), and its imaging ability and quality will inevitably be limited. The configuration of its lens shape cannot effectively suppress the back focal length, so that the optical system cannot maintain a tight configuration
[0003] To sum up, the image quality of the conventional optical system is not good and the overall length is too long, so it is not suitable for miniaturized portable electronic products
Obviously, there is a problem in the industry that it is difficult to balance the imaging quality and the total length of the system. Therefore, there is an urgent need for a design with good imaging quality and full use of the lens group space to achieve a more compact design, which will be suitable for imaging on thin, light and portable electronic products. Optical System Mirror Group

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 example 》

[0098] Please refer to the first embodiment of the present invention Figure 1A , for the aberration curve of the first embodiment, please refer to Figure 1B . The imaging optical system lens group of the first embodiment is mainly composed of three lenses with refractive power, which sequentially include from the object side to the image side:

[0099] A first lens 110 with positive refractive power, the object side 111 is convex and the image side 112 is concave, the material is plastic, the object side 111 and the image side 112 of the first lens 110 are both aspherical;

[0100] A second lens 120 with negative refractive power, its object side 121 is convex and image side 122 is concave, its material is plastic, the object side 121 and image side 122 of the second lens 120 are both aspherical, and the first The object side surface 121 of the two lenses 120 is provided with at least one inflection point; and

[0101] A third lens 130 with negative refractive power, its o...

no. 2 example 》

[0130] Please refer to the second embodiment of the present invention Figure 2A , for the aberration curve of the second embodiment, please refer to Figure 2B . The lens group of the imaging optical system of the second embodiment is mainly composed of three lenses with refractive power, which sequentially include from the object side to the image side:

[0131] A first lens 210 with positive refractive power, the object side 211 and the image side 212 are convex, the material is plastic, the object side 211 and the image side 212 of the first lens 210 are both aspherical;

[0132] A second lens 220 with negative refractive power, its object side 221 is convex and image side 222 is concave, its material is plastic, the object side 221 and image side 222 of the second lens 220 are both aspherical, and the first The object side surface 221 of the second lens 220 is provided with at least one inflection point; and

[0133] A third lens 230 with negative refractive power, the...

no. 3 example 》

[0142] Please refer to the third embodiment of the present invention Figure 3A , for the aberration curve of the third embodiment, please refer to Figure 3B . The imaging optical system lens group of the third embodiment is mainly composed of three lenses with refractive power, which sequentially include from the object side to the image side:

[0143] A first lens 310 with positive refractive power, the object side 311 is convex and the image side 312 is concave, and its material is plastic, and the object side 311 and image side 312 of the first lens 310 are both aspherical surfaces;

[0144] A second lens 320 with negative refractive power, the object side 321 near the axis is flat and the image side 322 is concave, the material is plastic, the object side 321 and the image side 322 of the second lens 320 are both aspherical surfaces, And the object side 321 of the second lens 320 is provided with at least one inflection point; and

[0145] A third lens 330 with negati...

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Abstract

This invention provides an imaging optical lens system comprising three lens elements with refractive power: a positive first lens element having a convex object-side surface at a paraxial region; a negative plastic second lens element having a convex or flat object-side surface and a concave image-side surface at a paraxial region, and both the object-side surface and the image-side surface being aspheric; and a negative plastic third lens element having a concave object-side surface at a paraxial region, the shape of the image-side surface thereof changing from concave when near an optical axis to convex when away from the optical axis, and both the object-side surface and the image-side surface being aspheric. The aforesaid arrangement can not only effectively correct the astigmatism of the system against defocus problems but also effectively reduce the back focal length for desirable space usage. Therefore, the lens system can be more compact.

Description

technical field [0001] The invention relates to an imaging optical system lens group; in particular, to an imaging optical system lens group applied to miniaturized electronic products and three-dimensional (3D) imaging applications. Background technique [0002] The current electronic products are mainly thin and portable. Therefore, in addition to low-cost requirements, they are applied to various mobile devices, such as smart phones, tablets, Ultrabooks and other portable electronic products. Volume size is also repeatedly required to be miniaturized. As disclosed in U.S. Patent No. US7,957,076B2, in order to reduce the manufacturing cost, the common optical system mainly adopts two-piece lens structure. Advanced optical system requirements. On the other hand, the four-piece lens group disclosed in U.S. Patent No. US8,089,704B2 often limits the degree of miniaturization due to the excessive number of lens configurations, and its cost and complexity of manufacturing and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/18G02B13/00G02B1/04
CPCG02B13/0035G02B13/00G02B1/04
Owner LARGAN PRECISION