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Optical imaging lens

a technology of optical imaging and lens, applied in the field of optical imaging lenses, can solve the problems of reducing peripheral image quality, vague or deformed peripheral imaging, increasing production cost, etc., and achieves low manufacturing tolerance, low distortion, and high resolution.

Active Publication Date: 2017-06-29
NEWMAX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present patent is about a five-piece optical imaging lens that is designed to have very high resolution and low distortion, and also to require very precise manufacturing tolerances. This lens is a specialized optical device that is used in image processing and other optical applications.

Problems solved by technology

Nos. 102137030 and 102121155 have better image quality, however, the sensitivity problem during manufacturing and assembling processes is often existed while having a large aperture value, increasing the production cost.
Or the peripheral image quality will be reduced while reducing the assembly tolerance, causing the peripheral imaging vague or deformed.
Otherwise, the performance and resolution of the optical lens system with a wide field of view will be reduced, and the yield rate will be low.
Otherwise, the performance and resolution of the optical lens system with a wide field of view will be reduced, and the yield rate will be low.
Otherwise, the performance and resolution of the optical lens system with a wide field of view will be reduced, and the yield rate will be low.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0042]The equation for the aspheric surface profiles of the respective lens elements of the first embodiment is expressed as follows:

z=ch21+[1-(k+1)c2h2]0.5+Ah4+Bh6+Ch8+Dh10+Eh12+Gh14+…

[0043]wherein:[0044]z represents the value of a reference position with respect to a vertex of the surface of a lens and a position with a height h along the optical axis 190;[0045]c represents a paraxial curvature equal to 1 / R (R: a paraxial radius of curvature);[0046]h represents a vertical distance from the point on the curve of the aspheric surface to the optical axis 190;[0047]k represents the conic constant;[0048]A, B, C, D, E, G, . . . : represent the high-order aspheric coefficients.

[0049]In the first embodiment of the present optical imaging lens, the focal length of the optical imaging lens is f, the f-number of the optical imaging lens is Fno, the optical imaging lens has a maximum view angle (field of view) FOV, and they satisfy the relations:

f=3.710 mm;

Fno=2.0; and

FOV=78 degrees.

[0050]In ...

second embodiment

[0076]The detailed optical data of the second embodiment is shown in table 3, and the aspheric surface data is shown in table 4.

TABLE 3Embodiment 2f(focal length) = 3.669 mm, Fno = 2.0, FOV = 78 deg.CurvatureFocalSurfaceRadiusThicknessMaterialindexAbbe #length0objectInfinityInfinity1Infinity0.2602stopInfinity−0.2603Lens 11.530(ASP)0.747plastic1.54456.0002.6874−30.087(ASP)0.0305Lens 210.228(ASP)0.240plastic1.65121.500−5.14562.520(ASP)0.3647Lens 321.627(ASP)0.325plastic1.65121.500−34.515811.013(ASP)0.3169Lens 4−11.011(ASP)0.783plastic1.54456.0002.12710−1.078(ASP)0.37411Lens 5−1.809(ASP)0.382plastic1.54456.000−1.807122.335(ASP)0.29213IR cutInfinity0.210glass1.51764.167—filter14Infinity0.42515ImageInfinityInfinityplane

TABLE 4Aspheric CoefficientsSurface34567K:−7.4064E+00  3.0584E+02  1.0624E+02−2.7040E+00  3.1705E+02A:  2.4064E−01−1.1730E−01−1.4377E−01−2.3950E−02−2.0952E−01B:−2.2328E−01  5.2701E−01  7.1457E−01  3.4061E−01  1.2376E−01C:  1.6608E−01−1.0625E+00−1.3393E+00−4.8589E−01−1.5496...

third embodiment

[0086]The detailed optical data of the third embodiment is shown in table 5, and the aspheric surface data is shown in table 6.

TABLE 5Embodiment 3f(focal length) = 2.894 mm, Fno = 2.0, FOV = 79 deg.CurvatureFocalSurfaceRadiusThicknessMaterialindexAbbe #length0objectInfinityInfinity1Infinity0.1002stopInfinity−0.1003Lens 11.597(ASP)0.634plastic1.54456.0002.0214−3.077(ASP)0.0265Lens 27.474(ASP)0.240plastic1.65121.500−3.04161.559(ASP)0.2977Lens 33.889(ASP)0.246plastic1.65121.50049.62284.304(ASP)0.1759Lens 4−2.362(ASP)0.676plastic1.54456.0001.51410−0.674(ASP)0.14211Lens 5−72.042(ASP)0.404plastic1.53556.000−1.424120.775(ASP)0.28413IR cutInfinity0.210glass1.51764.167—filter14Infinity0.47115ImageInfinityInfinityplane

TABLE 6Aspheric coefficientssurface34567K:−1.2558E+01−1.8142E+017.3940E+01−6.3484E+00−7.5202E+01A:3.3034E−014.2063E−021.2696E−02−1.0900E−03−7.6970E−02B:−7.3460E−01−1.6975E−013.2336E−017.3576E−01−1.1819E+00C:1.1805E+00−1.4745E+00−2.2612E+00−2.0928E+004.2373E+00D:−1.6647E+005.0018...

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Abstract

An optical imaging lens includes, in order from an object side to an image side: a stop, a first lens element with a positive refractive power, a second lens element with a negative refractive power, a third lens element with a refractive power, a fourth lens element with a positive refractive power, and a fifth lens element with a negative refractive power. A focal length of the second lens element, the third lens element and the fourth lens element combined is f234, a focal length of the fifth lens element is f5, and they satisfy the relation: −1.8<f234 / f5<−1.0, so that the optical imaging lens would have an appropriate refractive power, and spherical aberration and astigmatism can also be reduced.

Description

BACKGROUND OF THE INVENTION[0001]Field of the Invention[0002]The present invention relates to an optical imaging lens, and more particularly to a miniaturized five-piece optical imaging lens applicable to electronic products.[0003]Related Prior Art[0004]Currently, small imaging lens with high image quality has become the standard equipment for mobile devices. In addition, as the advanced semiconductor manufacturing technologies have allowed the pixel size of image sensors to be reduced and compact, there's an increasing demand for imaging lens featuring finer resolution and better image quality.[0005]A conventional imaging lens used in mobile devices, such as, mobile phone, tablet computer and other wearable electronic devices, usually consists of three to four lens elements: such as the imaging lenses described in U.S. Pat. Nos. 7,564,635 and 7,920,340, which cannot obtain better image quality. The imaging lenses consisting of five lens elements disclosed in U.S. Pat. Nos. 8,605,36...

Claims

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Application Information

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IPC IPC(8): G02B13/00G02B9/60
CPCG02B9/60G02B13/0045
Inventor TSAI, FEI-HSINLAI, SHU-TZU
Owner NEWMAX TECH