TWI700513B - Six-piece optical lens system - Google Patents

Abstract

A six-piece optical lens system includes, in order from the object side to the 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 negative refractive power, a fifth lens element with a positive refractive power, and a sixth lens element with a negative refractive power. Such arrangements can provide a miniaturized six-piece optical lens system having a big stop and high image quality.

Description

Six-element imaging lens group

The present invention relates to a six-piece imaging lens set, and particularly refers to a miniaturized six-piece imaging lens set applied to electronic products.

In recent years, portable electronic devices such as smart phones and tablet computers have developed rapidly. Miniaturized optical lenses used in portable electronic devices have become indispensable. With the advancement of semiconductor process technology, smaller areas have been developed. , Image sensors with higher pixels have led the miniaturization of optical lenses into the field of high pixels, so imaging quality has become the research direction of various industries.

Traditionally, high-pixel miniaturized optical lenses mounted on electronic devices mostly use a five-element lens structure. However, due to high-end smart phones, wearable devices and tablet personal computers ) The prevalence of high-spec portable electronic devices has driven the improvement of the pixel and imaging quality requirements of miniaturized optical lenses. The conventional five-element optical lens will not be able to meet higher-end requirements.

Although there is a general traditional six-element optical lens developed to provide a photographic lens with a large aperture and high image quality. However, the total optical length of an optical lens with a large aperture and high image quality is prone to be too long, making it difficult for the optical lens to have the characteristics of large aperture, high image quality and miniaturization at the same time, which is not conducive to use in portable electronic devices on.

Therefore, the continuous development of an optical lens with the characteristics of large aperture, high image quality and miniaturization at the same time is the motivation of the present invention.

The object of the present invention is to provide a six-element imaging lens set, especially a six-element imaging lens set that has the characteristics of large aperture, high image quality and miniaturization.

The reason is that, in order to achieve the foregoing objective, a six-element imaging lens set according to the present invention includes an aperture and an optical group composed of six lenses, from the object side to the image side in order: the aperture; A first lens with positive refractive power, the object side surface of the first lens is convex near the optical axis, the image side surface of the first lens is concave near the optical axis, and the object side surface of the first lens is At least one side surface is aspherical; a second lens with negative refractive power, the object side surface of the second lens is convex near the optical axis, and the image side surface of the second lens is concave near the optical axis. At least one of the object side surface and the image side surface of the second lens is aspherical; a third lens has refractive power, and at least one of the object side surface and the image side surface of the third lens is aspherical; a fourth lens , With negative refractive power, the object side surface of the fourth lens is convex near the optical axis, the image side surface of the fourth lens is concave near the optical axis, and the fourth lens has at least one object side surface and image side surface The surface is aspherical, and at least one of the object-side surface and the image-side surface of the fourth lens has at least one inflection point; a fifth lens has a positive refractive power, and the object-side surface of the fifth lens near the optical axis is Convex, the image side surface of the fifth lens is convex near the optical axis, at least one of the object side surface and the image side surface of the fifth lens is aspherical, and at least one of the object side surface and the image side surface of the fifth lens The surface has at least one inflection point; and a sixth lens with negative refractive power. The object side surface of the sixth lens is concave near the optical axis, and the image side surface of the sixth lens is concave near the optical axis. At least one surface of the object side surface and the image side surface of the sixth lens is aspherical, and at least one surface of the object side surface and the image side surface of the sixth lens has at least one inflection point.

Preferably, the focal length of the first lens is f1 and the focal length of the second lens is f2, and the following conditions are satisfied: -0.6<f1/f2<-0.3. In this way, the refractive power configuration of the first lens and the second lens is more suitable, which can help to obtain a wide angle of view (field of view) and reduce excessive increase in system aberrations.

Preferably, the focal length of the second lens is f2 and the focal length of the third lens is f3, and the following conditions are met: -0.03>f2/f3>0.43. Thereby, the refractive power of the third lens can be effectively distributed while ensuring that the refractive power of the third lens is not too large, which is beneficial to reduce the sensitivity of the system and reduce the generation of aberrations.

Preferably, the focal length of the third lens is f3 and the focal length of the fourth lens is f4, and the following conditions are satisfied: -81>f3/f4>3.1. In this way, the refractive power of the fourth lens can be effectively distributed while ensuring that the refractive power of the fourth lens is not too large, which is beneficial to reduce system sensitivity and reduce aberrations.

Preferably, the focal length of the fourth lens is f4, and the focal length of the fifth lens is f5, and the following conditions are satisfied: -13.6>f4/f5>-3.3. In this way, the refractive power of the fifth lens can be effectively distributed while ensuring that the refractive power of the fifth lens is not too large, which is beneficial to reduce the system sensitivity and reduce the generation of aberrations.

Preferably, the focal length of the fifth lens is f5 and the focal length of the sixth lens is f6, and the following conditions are satisfied: -1.7> f5/f6> -0.75. Thereby, the refractive power of the sixth lens element can be effectively distributed and at the same time it is ensured that the refractive power of the sixth lens element is not too large, which is beneficial to reduce the sensitivity of the system and reduce the generation of aberrations.

Preferably, the focal length of the first lens is f1, and the combined focal length of the second lens and the third lens is f23, and the following conditions are satisfied: -0.70> f1/f23> -0.30. Thereby, the refractive power balance of the six-piece imaging lens group can be maintained, and the best imaging effect can be achieved.

Preferably, the combined focal length of the second lens and the third lens is f23, and the focal length of the fourth lens is f4, and the following condition is satisfied: 0.1>f23/f4>0.85. Thereby, it is beneficial to improve the large viewing angle and large aperture characteristics of the six-piece imaging lens group, and can reduce its sensitivity, which is beneficial to the production of each lens and improves the production yield.

Preferably, the composite focal length of the second lens and the third lens is f23, and the composite focal length of the fourth lens and the fifth lens is f45, and the following conditions are satisfied: -3.0> f23/f45> -1.0. When f23/f45 satisfies the aforementioned relational expression, the six-element imaging lens group can have a large angle of view, high number of pictures and low lens height, while the resolution capability is significantly improved. On the contrary, if the data value of the above optical type is exceeded The range will cause problems such as the performance, low resolution, and insufficient yield of the six-element imaging lens set.

Preferably, the combined focal length of the fourth lens and the fifth lens is f45, and the focal length of the sixth lens is f6, and the following conditions are satisfied: -1.9> f45/f6> -0.85. When f45/f6 satisfies the aforementioned relationship, the six-element imaging lens set can have a large angle of view, a high number of pictures, and a low lens height, while the resolution capability is significantly improved. On the contrary, if it exceeds the above optical data value The range will cause problems such as the performance, low resolution, and insufficient yield of the six-element imaging lens set.

Preferably, the composite focal length of the first lens and the second lens is f12, and the composite focal length of the third lens and the fourth lens is f34, and the following conditions are satisfied: -0.65> f12/f34> -0.15. When f12/f34 satisfies the aforementioned relational expression, the six-element imaging lens set can have a large angle of view, a high number of pictures, and a low lens height, while the resolution capability is significantly improved. On the contrary, if it exceeds the above optical data value The range will cause problems such as the performance, low resolution, and insufficient yield of the six-element imaging lens set.

Preferably, the composite focal length of the third lens and the fourth lens is f34, and the composite focal length of the fifth lens and the sixth lens is f56, and the following conditions are satisfied: -1.25> f34/f56> -0.15. When f34/f56 satisfies the aforementioned relationship, the six-element imaging lens group can have a large angle of view, a high number of pictures, and a low lens height, while the resolution capability is significantly improved. On the contrary, if it exceeds the above optical data value The range will cause problems such as the performance, low resolution, and insufficient yield of the six-element imaging lens set.

Preferably, the composite focal length of the first lens, the second lens and the third lens is f123, and the composite focal length of the fourth lens and the fifth lens is f45, and the following condition is satisfied: 1.0>f123/f45>2.5. With proper configuration of refractive power, it helps to reduce spherical aberration and astigmatism.

Preferably, the composite focal length of the first lens, the second lens and the third lens is f123, and the composite focal length of the fourth lens, the fifth lens and the sixth lens is f456, and the following conditions are met: -0.35>f123 /f456> 0.15. When f123/f456 satisfies the aforementioned relational expressions, the six-element imaging lens set can have a large angle of view, high number of pictures, and low lens height, while the resolution capability is significantly improved. On the contrary, if it exceeds the above optical data value The range will cause problems such as the performance, low resolution, and insufficient yield of the six-element imaging lens set.

Preferably, the focal length of the first lens is f1, and the combined focal length of the second lens, the third lens, and the fourth lens is f234, and the following conditions are satisfied: -1.05> f1/f234> -0.45. With proper configuration of refractive power, it helps to reduce spherical aberration and astigmatism.

Preferably, the composite focal length of the second lens, the third lens and the fourth lens is f234, and the composite focal length of the fifth lens and the sixth lens is f56, and the following conditions are met: -0.55> f234/f56>- 0.15. With proper configuration of refractive power, it helps to reduce spherical aberration and astigmatism.

Preferably, the composite focal length of the first lens and the second lens is f12, and the composite focal length of the third lens, the fourth lens and the fifth lens is f345, and the following conditions are satisfied: 1.00>f12/f345>2.15. When f12/f345 satisfies the aforementioned relationship, the six-element imaging lens set can have a large angle of view, a high number of pictures, and a low lens height, while the resolution capability is significantly improved. On the contrary, if it exceeds the above optical data value The range will cause problems such as the performance, low resolution, and insufficient yield of the six-element imaging lens set.

Preferably, the combined focal length of the third lens, the fourth lens and the fifth lens is f345, and the focal length of the sixth lens is f6, and the following conditions are satisfied: -1.95>f345/f6>-0.9. When f345/f6 satisfies the aforementioned relational expression, the six-element imaging lens set can have a large angle of view, a high number of pictures, and a low lens height, while the resolution capability is significantly improved. On the contrary, if it exceeds the above optical data value The range will cause problems such as the performance, low resolution, and insufficient yield of the six-element imaging lens set.

Preferably, the curvature radius of the object side surface of the third lens is R5, and the curvature radius of the image side surface of the third lens is R6, and the following conditions are satisfied: -2.0> R5/R6> 4.8. Thereby, the curvature configuration of the third lens surface is effectively balanced to achieve a balance between the angle of view and the total length.

Preferably, the thickness of the second lens on the optical axis is CT2, and the thickness of the first lens on the optical axis is CT1, and the following condition is satisfied: 0.15>CT2/CT1>0.45. This effectively reduces the spherical aberration and astigmatism of the six-element imaging lens set.

Preferably, the thickness of the third lens on the optical axis is CT3, and the thickness of the second lens on the optical axis is CT2, and the following condition is satisfied: 0.60>CT3/CT2>1.35. This effectively reduces the spherical aberration and astigmatism of the six-element imaging lens set.

Preferably, the overall focal length of the six-piece imaging lens set is f, and the distance from the object side surface of the first lens to the imaging surface on the optical axis is TL, and the following conditions are met: 0.6> f/TL> 1.2 . In this way, it is beneficial to obtain a wide angle of view (field of view) and to maintain the miniaturization of the six-piece imaging lens set for mounting on thin and light electronic products.

Preferably, the dispersion coefficient of the first lens is V1, and the dispersion coefficient of the second lens is V2, and the following condition is satisfied: 30>V1-V2>42. Thereby, the chromatic aberration of the six-piece imaging lens group can be corrected.

Preferably, the dispersion coefficient of the third lens is V3, and the dispersion coefficient of the fourth lens is V4, and the following condition is satisfied: 30>V4-V3>42. Thereby, the chromatic aberration of the six-piece imaging lens group can be corrected.

Regarding the technology, means and other effects used by the present invention to achieve the above-mentioned objects, six preferred and feasible embodiments are described in detail below in conjunction with the drawings.

>First Embodiment>

Please refer to FIGS. 1A and 1B, where FIG. 1A shows a schematic diagram of a six-piece imaging lens set according to a first embodiment of the present invention, and FIG. 1B shows the six-piece imaging lens set of the first embodiment in order from left to right The curvature of the image surface and the distortion of the curve graph. It can be seen from FIG. 1A that the six-piece imaging lens group includes an aperture 100 and an optical group, which sequentially includes a first lens 110, a second lens 120, a third lens 130, and a fourth lens from the object side to the image side. The lens 140, the fifth lens 150, the sixth lens 160, the infrared filter element 170, and the imaging surface 180, wherein there are six lenses with refractive power in the six-piece imaging lens group. The aperture 100 is arranged between the image side surface 112 of the first lens 110 and the object.

The first lens 110 has a positive refractive power and is made of plastic. Its object side surface 111 is convex near the optical axis 190, and its image side surface 112 is concave near the optical axis 190, and the object side surface 111 and the image side The surfaces 112 are all aspherical.

The second lens 120 has a negative refractive power and is made of plastic. Its object side surface 121 is convex near the optical axis 190, and its image side surface 122 is concave near the optical axis 190. The object side surface 121 and the image side The surfaces 122 are all aspherical.

The third lens 130 has a negative refractive power and is made of plastic. Its object side surface 131 is concave near the optical axis 190, and its image side surface 132 is concave near the optical axis 190. The object side surface 131 and the image side are concave. The surfaces 132 are all aspherical.

The fourth lens 140 has a negative refractive power and is made of plastic. Its object side surface 141 is convex near the optical axis 190, and its image side surface 142 is concave near the optical axis 190. The object side surface 141 and the image side The surface 142 is aspherical, and both the object side surface 141 and the image side surface 142 have at least one inflection point.

The fifth lens 150 has a positive refractive power and is made of plastic. Its object side surface 151 is convex near the optical axis 190, and its image side surface 152 is convex near the optical axis 190. The object side surface 151 and the image side are convex. The surface 152 is aspherical, and the object-side surface 151 has at least one inflection point.

The sixth lens 160 has a negative refractive power and is made of plastic. Its object-side surface 161 is concave near the optical axis 190, and its image-side surface 162 is concave near the optical axis 190, and the object-side surface 161 and the image side are concave. The surface 162 is aspherical, and the image side surface 162 has at least one inflection point.

The infrared ray filter element 170 is made of glass, which is arranged between the sixth lens 160 and the imaging surface 180 and does not affect the focal length of the six-piece imaging lens group.

The curve equations of the aspheric surfaces of the above lenses are expressed as follows:

Where z is the position value referenced by the apex of the surface at a height h along the optical axis 190; c is the curvature of the lens surface close to the optical axis 190, and is the reciprocal of the radius of curvature (R) (c=1/R) , R is the radius of curvature of the lens surface close to the optical axis 190, h is the vertical distance between the lens surface and the optical axis 190, k is the conic constant, and A, B, C, D, E, F, G... Is the high-order aspheric coefficient.

In the six-element imaging lens group of the first embodiment, the focal length of the six-element imaging lens group is f, the f-number of the six-element imaging lens group is Fno, and the maximum viewing angle of the six-element imaging lens group is The field angle is FOV, and its values are as follows: f = 3.89 (mm); Fno = 1.86; and FOV = 81 (degrees).

In the six-piece imaging lens set of the first embodiment, the focal length of the first lens 110 is f1, and the focal length of the second lens 120 is f2, and the following conditions are met: f1/f2 = -0.42.

In the six-piece imaging lens group of the first embodiment, the focal length of the second lens 120 is f2, and the focal length of the third lens 130 is f3, and the following conditions are met: f2/f3=0.21.

In the six-piece imaging lens group of the first embodiment, the focal length of the third lens 130 is f3, and the focal length of the fourth lens 140 is f4, and the following conditions are satisfied: f3/f4=2.35.

In the six-piece imaging lens group of the first embodiment, the focal length of the fourth lens 140 is f4, and the focal length of the fifth lens 150 is f5, and the following conditions are satisfied: f4/f5 = -6.53.

In the six-piece imaging lens group of the first embodiment, the focal length of the fifth lens 150 is f5, and the focal length of the sixth lens 160 is f6, and the following conditions are satisfied: f5/f6 = -1.06.

In the six-element imaging lens group of the first embodiment, the focal length of the first lens 110 is f1, and the combined focal length of the second lens 120 and the third lens 130 is f23, and the following conditions are met: f1/f23 = -0.51 .

In the six-piece imaging lens group of the first embodiment, the combined focal length of the second lens 120 and the third lens 130 is f23, and the focal length of the fourth lens 140 is f4, and the following conditions are satisfied: f23/f4 = 0.41.

In the six-element imaging lens group of the first embodiment, the combined focal length of the second lens 120 and the third lens 130 is f23, and the combined focal length of the fourth lens 140 and the fifth lens 150 is f45, and the following conditions are met: f23/f45 = -2.31.

In the six-element imaging lens group of the first embodiment, the combined focal length of the fourth lens 140 and the fifth lens 150 is f45, and the focal length of the sixth lens 160 is f6, and the following conditions are met: f45/f6 = -1.23 .

In the six-element imaging lens group of the first embodiment, the composite focal length of the first lens 110 and the second lens 120 is f12, and the composite focal length of the third lens 130 and the fourth lens 140 is f34, and the following conditions are met: f12/f34 = -0.44.

In the six-piece imaging lens set of the first embodiment, the combined focal length of the third lens 130 and the fourth lens 140 is f34, and the combined focal length of the fifth lens 150 and the sixth lens 160 is f56, and the following conditions are met: f34/f56 = -0.93.

In the six-element imaging lens group of the first embodiment, the combined focal length of the first lens 110, the second lens 120 and the third lens 130 is f123, and the combined focal length of the fourth lens 140 and the fifth lens 150 is f45 , And meet the following conditions: f123/f45 = 1.64.

In the six-element imaging lens group of the first embodiment, the combined focal length of the first lens 110, the second lens 120 and the third lens 130 is f123, and the fourth lens 140, the fifth lens 150 and the sixth lens 160 The composite focal length is f456, and the following conditions are met: f123/f456 = 0.03.

In the six-element imaging lens group of the first embodiment, the focal length of the first lens 110 is f1, and the combined focal length of the second lens 120, the third lens 130 and the fourth lens 140 is f234, and the following conditions are met: f1 /f234 = -0.76.

In the six-piece imaging lens group of the first embodiment, the combined focal length of the second lens 120, the third lens 130 and the fourth lens 140 is f234, and the combined focal length of the fifth lens 150 and the sixth lens 160 is f56. And meet the following conditions: f234/f56 = -0.37.

In the six-piece imaging lens group of the first embodiment, the composite focal length of the first lens 110 and the second lens 120 is f12, and the composite focal length of the third lens 130, the fourth lens 140 and the fifth lens 150 is f345 , And meet the following conditions: f12/f345 = 1.64.

In the six-element imaging lens group of the first embodiment, the combined focal length of the third lens 130, the fourth lens 140 and the fifth lens 150 is f345, the focal length of the sixth lens 160 is f6, and the following conditions are met: f345 /f6 = -1.29.

In the six-piece imaging lens set of the first embodiment, the object-side surface 131 of the third lens 130 has a radius of curvature of R5, and the image-side surface 132 of the third lens 130 has a radius of curvature of R6, and meets the following conditions: R5/ R6 = -1.53.

In the six-piece imaging lens set of the first embodiment, the thickness of the second lens 120 on the optical axis 190 is CT2, and the thickness of the first lens 110 on the optical axis 190 is CT1, and the following conditions are met: CT2/ CT1 = 0.31.

In the six-piece imaging lens set of the first embodiment, the thickness of the third lens 130 on the optical axis 190 is CT3, and the thickness of the second lens 120 on the optical axis 190 is CT2, and the following conditions are met: CT3/ CT= 1.00.

In the six-piece imaging lens group of the first embodiment, the overall focal length of the six-piece imaging lens group is f, and the distance from the object side surface 111 of the first lens 110 to the imaging surface 180 on the optical axis 190 is TL, And meet the following conditions: f/TL = 0.85.

In the six-piece imaging lens set of the first embodiment, the dispersion coefficient of the first lens 110 is V1, and the dispersion coefficient of the second lens 120 is V2, and the following conditions are satisfied: V1-V2=35.63.

In the six-piece imaging lens set of the first embodiment, the dispersion coefficient of the third lens 130 is V3, and the dispersion coefficient of the fourth lens 140 is V4, and the following conditions are satisfied: V4-V3=35.63.

Refer to Table 1 and Table 2 below for cooperation.

Table 1 First embodiment f (focal length) = 3.89 mm (mm), Fno (aperture value) = 1.86, FOV (angle of view) = 81deg. (degrees) surface To Radius of curvature thickness Material Refractive index Dispersion coefficient focal length 0 Subject unlimited unlimited To To To To 1 aperture unlimited -0.423 To To To To 2 First lens 1.452 (ASP) 0.700 plastic 1.54 56 3.08 3 To 8.755 (ASP) 0.034 To 　 　 　 4 Second lens 8.602 (ASP) 0.220 plastic 1.66 20.37 -7.39 5 To 3.099 (ASP) 0.305 To 　 　 　 6 Third lens -58.484 (ASP) 0.220 plastic 1.66 20.37 -34.59 7 To 38.124 (ASP) 0.180 To 　 　 　 8 Fourth lens 6.447 (ASP) 0.383 plastic 1.54 56 -14.74 9 To 3.504 (ASP) 0.249 To 　 　 　 10 Fifth lens 8.105 (ASP) 0.561 plastic 1.54 56 2.26 11 To -1.417 (ASP) 0.482 To 　 　 　 12 Sixth lens -1.464 (ASP) 0.301 plastic 1.54 56 -2.12 13 To 5.950 (ASP) 0.308 To To To To 14 Infrared filter Filter unlimited 0.210 glass 1.52 64.2 To 15 To unlimited 0.428 To To To To 16 Imaging surface unlimited 0.000 To To To To

Table 2 Aspheric coefficient flat 2 3 4 5 6 7 K: -7.6748E-01 5.5237E+01 7.2599E+01 -2.2600E+01 6.0784E+01 8.9387E+01 A: 3.1229E-02 -1.5139E-01 -1.8594E-01 5.9963E-02 -1.7569E-01 -2.0589E-01 B: 7.8749E-03 2.3028E-01 5.6162E-01 1.8856E-01 5.7608E-01 5.2060E-01 C: 4.8847E-02 8.4627E-02 -1.2003E+00 -7.1009E-01 -3.2005E+00 -1.6852E+00 D: -1.2789E-01 -9.7168E-01 2.0632E+00 1.5350E+00 8.7630E+00 3.1348E+00 E: 1.5044E-01 1.4931E+00 -2.6460E+00 -2.0114E+00 -1.4077E+01 -3.4951E+00 F -7.4280E-02 -9.9187E-01 2.0613E+00 1.4146E+00 1.1905E+01 2.1760E+00 G 5.7099E-03 2.4575E-01 -6.8358E-01 -3.6770E-01 -4.0138E+00 -5.2271E-01 flat 8 9 10 11 12 13 K: -3.1525E+01 -9.9000E+01 2.0527E+01 -4.3353E+00 -6.7832E-01 -9.2373E+01 A: -3.3717E-01 -1.2782E-01 -1.7067E-01 -8.0048E-02 6.8757E-02 -2.3973E-02 B: 5.5090E-01 -9.0521E-02 1.8120E-01 5.2174E-02 -1.0224E-02 -4.0206E-03 C: -7.8658E-01 3.5890E-01 -1.8128E-01 8.5279E-02 5.5653E-04 3.7648E-03 D: 6.1623E-01 -6.2035E-01 1.0611E-01 -1.1950E-01 2.2163E-03 -1.6240E-03 E: -1.0266E-01 5.4720E-01 -6.1093E-02 5.5439E-02 -8.2593E-04 3.5440E-04 F -1.1842E-01 -2.2801E-01 2.5067E-02 -1.1123E-02 1.1479E-04 -3.5993E-05 G 4.5574E-02 3.5562E-02 -3.9484E-03 8.1699E-04 -5.6021E-06 1.3677E-06

Table 1 shows the detailed structure data of the first embodiment in FIG. 1A, in which the unit of the radius of curvature, the thickness and the focal length are mm, and the surface 0-16 indicates the surface from the object side to the image side in sequence. Table 2 is the aspheric surface data in the first embodiment, where k represents the conical surface coefficient in the aspheric surface curve equation, and A, B, C, D, E, F, G... are high-order aspheric surface coefficients. In addition, the following embodiment tables correspond to the schematic diagrams and field curvature curve diagrams of the respective embodiments. The definitions of the data in the tables are the same as those in Table 1 and Table 2 of the first embodiment, and will not be repeated here.

>Second Embodiment>

Please refer to FIGS. 2A and 2B, where FIG. 2A shows a schematic diagram of a six-piece imaging lens group according to a second embodiment of the present invention, and FIG. 2B shows the six-piece imaging lens group in the second embodiment from left to right. Curved image surface and distorted graph It can be seen from FIG. 2A that the six-piece imaging lens group includes an aperture 200 and an optical group, which sequentially includes a first lens 210, a second lens 220, a third lens 230, and a fourth lens from the object side to the image side. The lens 240, the fifth lens 250, the sixth lens 260, the infrared filter element 270, and the imaging surface 280, wherein there are six lenses with refractive power in the six-piece imaging lens group. The aperture 200 is arranged between the image side surface 212 of the first lens 210 and the object.

The first lens 210 has a positive refractive power and is made of plastic. Its object side surface 211 is convex near the optical axis 290, and its image side surface 212 is concave near the optical axis 290. The object side surface 211 and the image side The surfaces 212 are all aspherical.

The second lens 220 has a negative refractive power and is made of plastic. Its object-side surface 221 is convex near the optical axis 290, and its image-side surface 222 is concave near the optical axis 290. The object-side surface 221 and the image side The surfaces 222 are all aspherical.

The third lens 230 has a negative refractive power and is made of plastic. Its object-side surface 231 is concave near the optical axis 290, and its image-side surface 232 is concave near the optical axis 290, and the object-side surface 231 and the image side are concave. The surfaces 232 are all aspherical.

The fourth lens 240 has a negative refractive power and is made of plastic. Its object side surface 241 is convex near the optical axis 290, and its image side surface 242 is concave near the optical axis 290, and the object side surface 241 and the image side The surface 242 is aspherical, and the object side surface 241 and the image side surface 242 both have at least one inflection point.

The fifth lens 250 has a positive refractive power and is made of plastic. Its object side surface 251 is convex near the optical axis 290, and its image side surface 252 is convex near the optical axis 290, and the object side surface 251 and the image side The surface 252 is aspherical, and the object-side surface 241 has at least one inflection point.

The sixth lens 260 has a negative refractive power and is made of plastic. Its object side surface 261 is concave near the optical axis 290, and its image side surface 262 is concave near the optical axis 290, and the object side surface 261 and the image side The surfaces 262 are all aspherical, and the image side surface 262 has at least one inflection point.

The infrared ray filter element 270 is made of glass, which is arranged between the sixth lens 260 and the imaging surface 280 and does not affect the focal length of the six-piece imaging lens group.

Refer to Table 3 and Table 4 below for cooperation.

table 3 Second embodiment f (focal length) = 3.90 mm (mm), Fno (aperture value) = 1.86, FOV (angle of view) = 80.94 deg. (degrees) surface To Radius of curvature thickness Material Refractive index Dispersion coefficient focal length 0 Subject unlimited unlimited To To To To 1 aperture unlimited -0.420 To To To To 2 First lens 1.467 (ASP) 0.695 plastic 1.54 56 3.09 3 To 9.431 (ASP) 0.037 To 　 　 　 4 Second lens 9.009 (ASP) 0.220 plastic 1.66 20.37 -7.55 5 To 3.199 (ASP) 0.343 To 　 　 　 6 Third lens -37.355 (ASP) 0.221 plastic 1.66 20.37 -22.93 7 To 25.950 (ASP) 0.138 To 　 　 　 8 Fourth lens 6.983 (ASP) 0.371 plastic 1.54 56 -14.99 9 To 3.697 (ASP) 0.243 To 　 　 　 10 Fifth lens 7.729 (ASP) 0.528 plastic 1.54 56 2.33 11 To -1.482 (ASP) 0.556 To 　 　 　 12 Sixth lens -1.460 (ASP) 0.298 plastic 1.54 56 -2.22 13 To 7.580 (ASP) 0.308 To To To To 14 Infrared filter Filter unlimited 0.210 glass 1.52 64.2 To 15 To unlimited 0.413 To To To To 16 Imaging surface unlimited 0.000 To To To To

Table 4 Aspheric coefficient flat 2 3 4 5 6 7 K: -7.7801E-01 5.5237E+01 7.6781E+01 -2.5405E+01 6.0784E+01 8.9387E+01 A: 2.7461E-02 -1.5041E-01 -1.8769E-01 4.9951E-02 -1.9346E-01 -3.0134E-01 B: 4.0041E-02 3.2778E-01 6.0178E-01 2.0639E-01 5.7273E-01 8.8154E-01 C: -9.2218E-02 -4.1514E-01 -1.3779E+00 -7.4344E-01 -2.8298E+00 -2.5067E+00 D: 1.8543E-01 3.0034E-01 2.4802E+00 1.6095E+00 6.9910E+00 4.3373E+00 E: -2.2203E-01 -2.2813E-01 -3.1520E+00 -2.1271E+00 -1.0360E+01 -4.6102E+00 F 1.5065E-01 1.9436E-01 2.3405E+00 1.5138E+00 8.1242E+00 2.7521E+00 G -4.7837E-02 -8.0143E-02 -7.2989E-01 -4.0677E-01 -2.5095E+00 -6.5865E-01 flat 8 9 10 11 12 13 K: -3.1525E+01 -9.6809E+01 -2.4236E+01 -8.1771E+00 -6.8126E-01 -9.2373E+01 A: -4.9625E-01 -2.4195E-01 -1.3990E-01 -1.7455E-01 9.9805E-02 -2.2676E-02 B: 1.0511E+00 1.3613E-01 1.0477E-01 2.5268E-01 -6.5556E-02 -7.7280E-03 C: -1.7493E+00 6.7663E-03 -5.1634E-02 -1.7107E-01 3.6500E-02 4.7919E-03 D: 1.9817E+00 -2.3093E-01 -7.1285E-02 4.8264E-02 -9.6552E-03 -1.3134E-03 E: -1.3227E+00 3.0802E-01 8.6309E-02 -1.3772E-03 1.3216E-03 1.6836E-04 F 4.6788E-01 -1.5843E-01 -3.6846E-02 -1.6594E-03 -8.8157E-05 -6.1768E-06 G -6.7675E-02 2.8744E-02 6.0111E-03 2.0354E-04 2.2302E-06 -2.2399E-07

In the second embodiment, the curve equation of the aspheric surface is expressed as in the first embodiment. In addition, the definitions of the parameters in the following table are the same as those in the first embodiment, and will not be repeated here.

With Table 3 and Table 4, the following data can be calculated:

Second embodiment f[mm] 3.90 f12/f34 -0.50 Fno 1.86 f34/f56 -0.92 FOV[deg.] 80.94 f123/f45 1.90 f1/f2 -0.41 f123/f456 0.10 f2/f3 0.33 f1/f234 -0.79 f3/f4 1.53 f234/f56 -0.40 f4/f5 -6.44 f12/f345 1.53 f5/f6 -1.05 f345/f6 -1.31 f1/f23 -0.55 R5/R6 -1.44 f23/f4 0.37 CT2/CT1 0.32 f23/f45 -2.08 CT3/CT2 1.00 f45/f6 -1.22 f/TL 0.85 V1-V2 35.63 V4-V3 35.63

>Third Embodiment>

Please refer to FIGS. 3A and 3B, in which FIG. 3A shows a schematic diagram of a six-piece imaging lens set according to a third embodiment of the present invention, and FIG. 2B shows the six-piece imaging lens set of the third embodiment in order from left to right The curvature of the image surface and the distortion of the curve graph. It can be seen from FIG. 3A that the six-piece imaging lens group includes an aperture 300 and an optical group, which sequentially includes a first lens 310, a second lens 320, a third lens 330, and a fourth lens from the object side to the image side. The lens 340, the fifth lens 350, the sixth lens 360, the infrared filter element 370, and the imaging surface 380, wherein there are six lenses with refractive power in the six-piece imaging lens group. The aperture 300 is arranged between the image side surface 312 of the first lens 310 and the object.

The first lens 310 has positive refractive power and is made of plastic. Its object side surface 311 is convex near the optical axis 390, and its image side surface 312 is concave near the optical axis 390. The object side surface 311 and the image side The surfaces 312 are all aspherical.

The second lens 320 has a negative refractive power and is made of plastic. The object side surface 321 is convex near the optical axis 390, and the image side surface 322 is concave near the optical axis 390. The object side surface 321 and the image side The surfaces 322 are all aspherical.

The third lens 330 has positive refractive power and is made of plastic. Its object side surface 331 is convex near the optical axis 390, and its image side surface 332 is concave near the optical axis 390. The object side surface 331 and the image side The surfaces 332 are all aspherical.

The fourth lens 340 has a negative refractive power and is made of plastic. Its object side surface 341 is convex near the optical axis 390, and its image side surface 342 is concave near the optical axis 390. The object side surface 341 and the image side The surface 342 is aspherical, and both the object side surface 341 and the image side surface 342 have at least one inflection point.

The fifth lens 350 has positive refractive power and is made of plastic. Its object side surface 351 is convex near the optical axis 390, and its image side surface 352 is convex near the optical axis 390. The object side surface 351 and the image side are convex. The surface 352 is aspherical, and the object side surface 341 has at least one inflection point.

The sixth lens 360 has negative refractive power and is made of plastic. Its object side surface 361 is concave near the optical axis 390, and its image side surface 362 is concave near the optical axis 390. The object side surface 361 and the image side The surface 362 is aspherical, and the image side surface 362 has at least one inflection point.

The infrared ray filter element 370 is made of glass, which is arranged between the sixth lens 360 and the imaging surface 380 and does not affect the focal length of the six-piece imaging lens group.

Refer to Table 5 and Table 6 below for cooperation.

table 5 The third embodiment f (focal length) = 4.76 mm (mm), Fno (aperture value) = 1.84, FOV (angle of view) = 82.22deg. (degrees) surface To Radius of curvature thickness Material Refractive index Dispersion coefficient focal length 0 Subject unlimited unlimited To To To To 1 aperture unlimited -0.549 To To To To 2 First lens 1.753 (ASP) 0.878 plastic 1.54 56 3.84 3 To 8.815 (ASP) 0.050 To 　 　 　 4 Second lens 11.920 (ASP) 0.241 plastic 1.67 19.24 -8.82 5 To 3.948 (ASP) 0.363 To 　 　 　 6 Third lens 626.713 (ASP) 0.231 plastic 1.67 19.24 946.56 7 To 27478.857 (ASP) 0.374 To 　 　 　 8 Fourth lens 5.953 (ASP) 0.366 plastic 1.54 56 -15.11 9 To 3.384 (ASP) 0.288 To 　 　 　 10 Fifth lens 7.880 (ASP) 0.570 plastic 1.54 56 3.20 11 To -2.189 (ASP) 0.743 To 　 　 　 12 Sixth lens -1.864 (ASP) 0.450 plastic 1.54 56 -2.74 13 To 8.226 (ASP) 0.308 To To To To 14 Infrared filter Filter unlimited 0.110 glass 1.52 64.2 To 15 To unlimited 0.410 To To To To 16 Imaging surface unlimited 0.000 To To To To

Table 6 Aspheric coefficient flat 2 3 4 5 6 7 K: -7.5327E-01 4.7594E+01 9.7590E+01 -2.0645E+01 5.8150E+01 8.6079E+01 A: 1.9904E-02 -1.3458E-01 -1.4900E-01 -1.4717E-02 -1.3088E-01 -1.4259E-01 B: -7.5475E-03 2.7358E-01 3.9168E-01 2.6902E-01 1.3689E-01 1.8572E-01 C: 3.6064E-02 -4.2957E-01 -6.7451E-01 -6.6676E-01 -3.8154E-01 -3.7008E-01 D: -5.2565E-02 4.7328E-01 8.4203E-01 1.0976E+00 5.8856E-01 4.4629E-01 E: 3.9894E-02 -3.5073E-01 -6.9309E-01 -1.1048E+00 -6.1094E-01 -3.2899E-01 F -1.4608E-02 1.4967E-01 3.2701E-01 6.1033E-01 3.5525E-01 1.3332E-01 G 1.7540E-03 -2.7908E-02 -6.5734E-02 -1.4007E-01 -8.2166E-02 -1.7988E-02 flat 8 9 10 11 12 13 K: -3.1030E+01 -9.1547E+00 -2.1427E-02 -4.6541E+00 -6.6520E-01 -9.2216E+01 A: -1.9420E-01 -1.8731E-01 -1.3461E-02 3.2478E-02 5.5123E-02 -1.0837E-02 B: 1.7214E-01 1.0009E-01 -2.3009E-02 -1.3690E-02 -3.6427E-02 -3.9768E-03 C: -1.1898E-01 -4.3308E-02 2.0346E-02 1.9712E-02 1.6275E-02 1.7257E-03 D: 4.1988E-02 1.3731E-03 -1.4537E-02 -1.7002E-02 -3.5107E-03 -3.6822E-04 E: -1.8999E-03 7.1015E-03 3.9992E-03 6.0042E-03 4.0979E-04 4.2613E-05 F -2.0210E-03 -2.2536E-03 -4.0554E-04 -9.5198E-04 -2.5130E-05 -2.4396E-06 G 2.9834E-04 2.0118E-04 1.2019E-05 5.6802E-05 6.4335E-07 5.3908E-08

In the third embodiment, the curve equation of the aspheric surface is expressed as in the first embodiment. In addition, the definitions of the parameters in the following table are the same as those in the first embodiment, and will not be repeated here.

With Table 5 and Table 6, the following data can be calculated:

The third embodiment f[mm] 4.76 f12/f34 -0.37 Fno 1.84 f34/f56 -0.73 FOV[deg.] 82.22 f123/f45 1.43 f1/f2 -0.43 f123/f456 -0.22 f2/f3 -0.01 f1/f234 -0.72 f3/f4 -62.64 f234/f56 -0.25 f4/f5 -4.72 f12/f345 1.53 f5/f6 -1.17 f345/f6 -1.45 f1/f23 -0.43 R5/R6 0.02 f23/f4 0.59 CT2/CT1 0.27 f23/f45 -2.24 CT3/CT2 0.96 f45/f6 -1.45 f/TL 0.88 V1-V2 35.63 V4-V3 35.63

> Fourth Embodiment>

Please refer to FIGS. 4A and 4B, where FIG. 4A shows a schematic diagram of a six-piece imaging lens group according to a fourth embodiment of the present invention, and FIG. 4B shows the six-piece imaging lens group in the fourth embodiment from left to right. The curvature of the image surface and the distortion of the curve graph. It can be seen from FIG. 4A that the six-piece imaging lens group includes an aperture 400 and an optical group, which sequentially includes a first lens 410, a second lens 420, a third lens 430, and a fourth lens from the object side to the image side. The lens 440, the fifth lens 450, the sixth lens 460, the infrared filter element 470, and the imaging surface 480, wherein there are six lenses with refractive power in the six-piece imaging lens group. The aperture 400 is arranged between the image side surface 412 of the first lens 410 and the object.

The first lens 410 has positive refractive power and is made of plastic material. Its object side surface 411 is convex near the optical axis 490, and its image side surface 412 is concave near the optical axis 490. The object side surface 411 and the image side The surfaces 412 are all aspherical.

The second lens 420 has a negative refractive power and is made of plastic. Its object-side surface 421 is convex near the optical axis 490, and its image-side surface 422 is concave near the optical axis 490, and the object-side surface 421 and the image side The surfaces 422 are all aspherical.

The third lens 430 has positive refractive power and is made of plastic. Its object-side surface 431 is convex near the optical axis 490, and its image-side surface 432 is convex near the optical axis 490. The object-side surface 431 and the image side are convex. The surfaces 432 are all aspherical.

The fourth lens 440 has a negative refractive power and is made of plastic. Its object side surface 441 is convex near the optical axis 490, and its image side surface 442 is concave near the optical axis 490, and the object side surface 441 and the image side The surface 442 is aspherical, and both the object side surface 441 and the image side surface 442 have at least one inflection point.

The fifth lens 450 has a positive refractive power and is made of plastic. Its object side surface 451 is convex near the optical axis 490, and its image side surface 452 is convex near the optical axis 490, and the object side surface 451 and the image side are convex. The surface 452 is aspherical, and the object side surface 441 has at least one inflection point.

The sixth lens 460 has negative refractive power and is made of plastic. Its object-side surface 461 is concave near the optical axis 490, and its image-side surface 462 is concave near the optical axis 490, and the object-side surface 461 and the image side are concave. The surface 462 is aspherical, and the image side surface 462 has at least one inflection point.

The infrared filter element 470 is made of glass, which is arranged between the sixth lens 460 and the imaging surface 480 and does not affect the focal length of the six-piece imaging lens group.

Refer to Table 7 and Table 8 below for cooperation.

Table 7 Fourth embodiment f (focal length) = 4.78 mm (mm), Fno (aperture value) = 1.84, FOV (angle of view) = 79.46deg. (degrees) surface To Radius of curvature thickness Material Refractive index Dispersion coefficient focal length 0 Subject unlimited unlimited To To To To 1 aperture unlimited -0.549 To To To To 2 First lens 1.753 (ASP) 0.878 plastic 1.54 56 3.84 3 To 8.813 (ASP) 0.049 To 　 　 　 4 Second lens 11.932 (ASP) 0.242 plastic 1.67 19.24 -8.78 5 To 3.938 (ASP) 0.363 To 　 　 　 6 Third lens 487.503 (ASP) 0.231 plastic 1.67 19.24 533.09 7 To -1393.791 (ASP) 0.374 To 　 　 　 8 Fourth lens 6.198 (ASP) 0.367 plastic 1.54 56 -15.10 9 To 3.465 (ASP) 0.290 To 　 　 　 10 Fifth lens 7.858 (ASP) 0.574 plastic 1.54 56 3.22 11 To -2.207 (ASP) 0.755 To 　 　 　 12 Sixth lens -1.870 (ASP) 0.429 plastic 1.54 56 -2.74 13 To 8.130 (ASP) 0.308 To To To To 14 Infrared filter Filter unlimited 0.110 glass 1.52 64.2 To 15 To unlimited 0.411 To To To To 16 Imaging surface unlimited 0.000 To To To To

Table 8 Aspheric coefficient flat 2 3 4 5 6 7 K: -7.508E-01 4.757E+01 9.761E+01 -2.058E+01 5.815E+01 8.608E+01 A: 1.975E-02 -1.382E-01 -1.509E-01 -1.441E-02 -1.277E-01 -1.394E-01 B: -6.584E-03 2.906E-01 3.998E-01 2.678E-01 1.112E-01 1.688E-01 C: 3.355E-02 -4.689E-01 -6.904E-01 -6.633E-01 -2.879E-01 -3.262E-01 D: -4.903E-02 5.269E-01 8.591E-01 1.090E+00 3.966E-01 3.818E-01 E: 3.713E-02 -3.927E-01 -7.022E-01 -1.094E+00 -3.875E-01 -2.736E-01 F -1.345E-02 1.669E-01 3.281E-01 6.014E-01 2.187E-01 1.078E-01 G 1.550E-03 -3.077E-02 -6.526E-02 -1.372E-01 -4.839E-02 -1.316E-02 flat 8 9 10 11 12 13 K: -3.127E+01 -9.074E+00 1.834E-01 -4.641E+00 -6.629E-01 -9.222E+01 A: -1.949E-01 -1.860E-01 -1.229E-02 3.373E-02 5.285E-02 -1.235E-02 B: 1.735E-01 9.769E-02 -2.359E-02 -1.555E-02 -3.467E-02 -2.999E-03 C: -1.233E-01 -4.182E-02 1.950E-02 2.061E-02 1.560E-02 1.390E-03 D: 4.752E-02 1.426E-03 -1.328E-02 -1.712E-02 -3.376E-03 -2.984E-04 E: -5.036E-03 6.749E-03 3.371E-03 5.960E-03 3.949E-04 3.432E-05 F -1.193E-03 -2.138E-03 -2.680E-04 -9.361E-04 -2.427E-05 -1.929E-06 G 2.143E-04 1.898E-04 7.004E-07 5.541E-05 6.227E-07 4.138E-08

In the fourth embodiment, the curve equation of the aspheric surface is expressed as in the first embodiment. In addition, the definitions of the parameters in the following table are the same as those in the first embodiment, and will not be repeated here.

With Table 7 and Table 8, the following data can be calculated:

Fourth embodiment f[mm] 4.75 f12/f34 -0.37 Fno 1.84 f34/f56 -0.73 FOV[deg.] 79.46 f123/f45 1.42 f1/f2 -0.44 f123/f456 -0.23 f2/f3 -0.02 f1/f234 -0.72 f3/f4 -35.29 f234/f56 -0.25 f4/f5 -4.69 f12/f345 1.44 f5/f6 -1.17 f345/f6 -1.45 f1/f23 -0.43 R5/R6 -0.35 f23/f4 0.59 CT2/CT1 0.28 f23/f45 -2.23 CT3/CT2 0.95 f45/f6 -1.46 f/TL 0.88 V1-V2 35.63 V4-V3 35.63

>Fifth Embodiment>

Please refer to FIGS. 5A and 5B, in which FIG. 5A shows a schematic diagram of a six-piece imaging lens set according to a fifth embodiment of the present invention, and FIG. 5B shows the six-piece imaging lens set of the fifth embodiment in order from left to right The curvature of the image surface and the distortion of the curve graph. It can be seen from FIG. 5A that the six-piece imaging lens group includes an aperture 500 and an optical group. The optical group includes a first lens 510, a second lens 520, a third lens 530, and a fourth lens from the object side to the image side. The lens 540, the fifth lens 550, the sixth lens 560, the infrared filter element 570, and the imaging surface 580, wherein there are six lenses with refractive power in the six-piece imaging lens group. The aperture 500 is arranged between the image side surface 512 of the first lens 510 and the object.

The first lens 510 has positive refractive power and is made of plastic. Its object side surface 511 is convex near the optical axis 590, and its image side surface 512 is concave near the optical axis 590. The object side surface 511 and the image side The surfaces 512 are all aspherical.

The second lens 520 has a negative refractive power and is made of plastic. Its object side surface 521 is convex near the optical axis 590, and its image side surface 522 is concave near the optical axis 590, and the object side surface 521 and the image side The surfaces 522 are all aspherical.

The third lens 530 has positive refractive power and is made of plastic. Its object-side surface 531 is concave near the optical axis 590, and its image-side surface 532 is convex near the optical axis 590, and the object-side surface 531 and the image side are convex. The surfaces 532 are all aspherical.

The fourth lens 540 has a negative refractive power and is made of plastic. Its object side surface 541 is convex near the optical axis 590, and its image side surface 542 is concave near the optical axis 590. The object side surface 541 and the image side The surface 542 is aspherical, and both the object side surface 541 and the image side surface 542 have at least one inflection point.

The fifth lens 550 has a positive refractive power and is made of plastic. Its object side surface 551 is convex near the optical axis 590, and its image side surface 552 is convex near the optical axis 590, and the object side surface 551 and the image side are convex. The surface 552 is aspherical, and the object-side surface 541 has at least one inflection point.

The sixth lens 560 has negative refractive power and is made of plastic. Its object-side surface 561 is concave near the optical axis 590, and its image-side surface 562 is concave near the optical axis 590. The object-side surface 561 and the image side are concave. The surface 562 is aspherical, and the image side surface 562 has at least one inflection point.

The infrared filter element 570 is made of glass, which is arranged between the sixth lens 560 and the imaging surface 580 and does not affect the focal length of the six-piece imaging lens group.

Refer to Table 9 and Table 10 below for cooperation.

Table 9 Fifth embodiment f (focal length) = 4.77 mm (mm), Fno (aperture value) = 1.84, FOV (angle of view) = 82.25deg. (degrees) surface To Radius of curvature thickness Material Refractive index Dispersion coefficient focal length 0 Subject unlimited unlimited To To To To 1 aperture unlimited -0.553 To To To To 2 First lens 1.753 (ASP) 0.885 plastic 1.54 56 3.84 3 To 8.804 (ASP) 0.049 To 　 　 　 4 Second lens 11.924 (ASP) 0.237 plastic 1.67 19.24 -8.74 5 To 3.925 (ASP) 0.365 To 　 　 　 6 Third lens -305.149 (ASP) 0.242 plastic 1.67 19.24 415.49 7 To -146.475 (ASP) 0.368 To 　 　 　 8 Fourth lens 6.272 (ASP) 0.363 plastic 1.54 56 -14.72 9 To 3.451 (ASP) 0.292 To 　 　 　 10 Fifth lens 7.840 (ASP) 0.571 plastic 1.54 56 3.22 11 To -2.206 (ASP) 0.767 To 　 　 　 12 Sixth lens -1.886 (ASP) 0.400 plastic 1.54 56 -2.72 13 To 7.542 (ASP) 0.308 To To To To 14 Infrared filter Filter unlimited 0.110 glass 1.52 64.2 To 15 To unlimited 0.424 To To To To 16 Imaging surface unlimited 0.000 To To To To

Table 10 Aspheric coefficient flat 2 3 4 5 6 7 K: -7.5154E-01 4.7474E+01 9.7527E+01 -2.0651E+01 5.8150E+01 8.6080E+01 A: 1.8797E-02 -1.4069E-01 -1.5696E-01 -1.7659E-02 -1.2828E-01 -1.4116E-01 B: -2.4137E-03 3.0019E-01 4.2609E-01 2.8536E-01 1.3778E-01 1.9184E-01 C: 2.3435E-02 -4.9410E-01 -7.5240E-01 -7.1209E-01 -4.2443E-01 -4.1122E-01 D: -3.5237E-02 5.7020E-01 9.5218E-01 1.1764E+00 7.2366E-01 5.4034E-01 E: 2.6429E-02 -4.3367E-01 -7.8429E-01 -1.1881E+00 -8.0448E-01 -4.3689E-01 F -9.0451E-03 1.8633E-01 3.6675E-01 6.5829E-01 4.8829E-01 1.9512E-01 G 8.1844E-04 -3.4442E-02 -7.2805E-02 -1.5144E-01 -1.1727E-01 -3.2040E-02 flat 8 9 10 11 12 13 K: -3.0881E+01 -8.8588E+00 -3.1743E-01 -4.6974E+00 -6.6167E-01 -9.2216E+01 A: -1.9294E-01 -1.8496E-01 -1.4349E-02 3.0476E-02 4.3174E-02 -1.8642E-02 B: 1.6049E-01 9.1970E-02 -1.8839E-02 -9.7082E-03 -2.0758E-02 1.9625E-03 C: -9.5454E-02 -3.2869E-02 1.2083E-02 1.6091E-02 9.2553E-03 -1.7856E-04 D: 1.9503E-02 -3.8301E-03 -6.8625E-03 -1.4807E-02 -1.9821E-03 -2.7665E-05 E: 9.3156E-03 8.0034E-03 5.0504E-04 5.2286E-03 2.3059E-04 7.4236E-06 F -4.7902E-03 -2.2142E-03 3.5576E-04 -8.1746E-04 -1.4180E-05 -4.8628E-07 G 5.6506E-04 1.8229E-04 -5.1772E-05 4.7966E-05 3.6756E-07 9.0375E-09

In the fifth embodiment, the aspherical curve equation is expressed as in the first embodiment. In addition, the definitions of the parameters in the following table are the same as those in the first embodiment, and will not be repeated here.

In conjunction with Table 9 and Table 10, the following data can be calculated:

Fifth embodiment f[mm] 4.77 f12/f34 -0.38 Fno 1.84 f34/f56 -0.71 FOV[deg.] 82.25 f123/f45 1.41 f1/f2 -0.44 f123/f456 -0.25 f2/f3 -0.02 f1/f234 -0.73 f3/f4 -28.24 f234/f56 -0.24 f4/f5 -4.58 f12/f345 1.44 f5/f6 -1.18 f345/f6 -1.47 f1/f23 -0.43 R5/R6 2.08 f23/f4 0.61 CT2/CT1 0.27 f23/f45 -2.23 CT3/CT2 1.02 f45/f6 -1.48 f/TL 0.89 V1-V2 35.63 V4-V3 35.63

>Sixth Embodiment>

Please refer to FIGS. 6A and 6B, where FIG. 6A shows a schematic diagram of a six-piece imaging lens set according to a sixth embodiment of the present invention, and FIG. 6B shows the six-piece imaging lens set of the sixth embodiment in order from left to right The curvature of the image surface and the distortion of the curve graph. It can be seen from FIG. 6A that the six-piece imaging lens group includes an aperture 600 and an optical group, which sequentially includes a first lens 610, a second lens 620, a third lens 630, and a fourth lens from the object side to the image side. The lens 640, the fifth lens 650, the sixth lens 660, the infrared filter element 670, and the imaging surface 680, wherein there are six lenses with refractive power in the six-piece imaging lens group. The aperture 600 is arranged between the image side surface 612 of the first lens 610 and the object.

The first lens 610 has positive refractive power and is made of plastic. Its object-side surface 611 is convex near the optical axis 690, and its image-side surface 612 is concave near the optical axis 690, and the object-side surface 611 and the image side The surfaces 612 are all aspherical.

The second lens 620 has negative refractive power and is made of plastic. Its object side surface 621 is convex near the optical axis 690, and its image side surface 622 is concave near the optical axis 690. The object side surface 621 and the image side The surfaces 622 are all aspherical.

The third lens 630 has negative refractive power and is made of plastic. Its object-side surface 631 is convex near the optical axis 690, and its image-side surface 632 is concave near the optical axis 690. The object-side surface 631 and the image side The surfaces 632 are all aspherical.

The fourth lens 640 has a negative refractive power and is made of plastic. Its object-side surface 641 is convex near the optical axis 690, and its image-side surface 642 is concave near the optical axis 690, and the object-side surface 641 and the image side The surface 642 is aspherical, and both the object side surface 641 and the image side surface 642 have at least one inflection point.

The fifth lens 650 has positive refractive power and is made of plastic. Its object-side surface 651 is convex near the optical axis 690, and its image-side surface 652 is convex near the optical axis 690, and the object-side surface 651 and the image side are convex. The surface 652 is aspherical, and the object-side surface 641 has at least one inflection point.

The sixth lens 660 has negative refractive power and is made of plastic. Its object-side surface 661 is concave near the optical axis 690, and its image-side surface 662 is concave near the optical axis 690, and the object-side surface 661 and the image side are concave. The surface 662 is aspherical, and the image side surface 662 has at least one inflection point.

The infrared ray filter element 670 is made of glass, which is arranged between the sixth lens 660 and the imaging surface 680 and does not affect the focal length of the six-piece imaging lens group.

Refer to Table 11 and Table 12 below for cooperation.

Table 11 Sixth embodiment f (focal length) = 4.73 mm (mm), Fno (aperture value) = 1.80, FOV (angle of view) = 82.06deg. (degrees) surface To Radius of curvature thickness Material Refractive index Dispersion coefficient focal length 0 Subject unlimited unlimited To To To To 1 aperture unlimited -0.569 To To To To 2 First lens 1.758 (ASP) 0.920 plastic 1.54 56 3.78 3 To 9.670 (ASP) 0.030 To 　 　 　 4 Second lens 12.187 (ASP) 0.252 plastic 1.66 20.37 -8.90 5 To 3.958 (ASP) 0.366 To 　 　 　 6 Third lens 101.061 (ASP) 0.223 plastic 1.66 20.37 -56.10 7 To 27.286 (ASP) 0.236 To 　 　 　 8 Fourth lens 9.910 (ASP) 0.430 plastic 1.54 56 -38.27 9 To 6.620 (ASP) 0.369 To 　 　 　 10 Fifth lens 13.140 (ASP) 0.518 plastic 1.54 56 3.65 11 To -2.320 (ASP) 0.837 To 　 　 　 12 Sixth lens -1.805 (ASP) 0.369 plastic 1.54 56 -2.83 13 To 11.642 (ASP) 0.308 To To To To 14 Infrared filter Filter unlimited 0.110 glass 1.52 64.2 To 15 To unlimited 0.416 To To To To 16 Imaging surface unlimited 0.000 To To To To

Table 12 Aspheric coefficient flat 2 3 4 5 6 7 K: -7.5816E-01 4.8601E+01 9.8781E+01 -1.9635E+01 5.8150E+01 8.6080E+01 A: 1.4747E-02 -1.6029E-01 -1.6982E-01 7.9038E-03 -1.5000E-01 -1.8363E-01 B: 1.3843E-02 2.3113E-01 3.4928E-01 1.2676E-01 2.7703E-01 3.2124E-01 C: -1.4776E-02 -2.9248E-02 -2.9868E-01 -1.6303E-01 -8.3732E-01 -6.5848E-01 D: 1.4633E-02 -3.1956E-01 5.6396E-02 8.4158E-02 1.4937E+00 8.8239E-01 E: -9.8926E-03 3.9259E-01 8.3453E-02 2.3490E-02 -1.6709E+00 -7.5941E-01 F 4.8288E-03 -1.9581E-01 -5.3670E-02 -4.5616E-02 1.0171E+00 3.7346E-01 G -1.3112E-03 3.6508E-02 8.9019E-03 1.6064E-02 -2.5038E-01 -7.3753E-02 flat 8 9 10 11 12 13 K: -3.2119E+01 -9.7956E+00 1.4299E+01 -2.5794E+00 -6.6588E-01 -9.2216E+01 A: -1.9109E-01 -1.6379E-01 -3.6053E-02 2.1573E-02 1.7486E-02 -3.7220E-02 B: 1.2809E-01 4.7665E-02 -3.3860E-02 -2.2589E-02 -2.6498E-03 1.4563E-02 C: 1.8370E-03 1.7769E-02 1.5855E-02 4.2143E-03 3.5924E-03 -4.5938E-03 D: -1.1913E-01 -3.6343E-02 -1.8183E-03 1.9148E-03 -1.0074E-03 8.9000E-04 E: 1.0679E-01 1.7891E-02 -2.6521E-03 -8.3801E-04 1.3965E-04 -1.0658E-04 F -3.6728E-02 -3.1912E-03 1.2276E-03 1.1365E-04 -1.0067E-05 7.1553E-06 G 4.4574E-03 1.4244E-04 -1.4528E-04 -5.3819E-06 3.0889E-07 -2.0010E-07

In the sixth embodiment, the curve equation of the aspheric surface is expressed as in the first embodiment. In addition, the definitions of the parameters in the following table are the same as those in the first embodiment, and will not be repeated here.

With Table 11 and Table 12, the following data can be calculated:

Sixth embodiment f[mm] 4.73 f12/f34 -0.25 Fno 1.80 f34/f56 -0.22 FOV[deg.] 82.06 f123/f45 1.47 f1/f2 -0.42 f123/f456 -0.15 f2/f3 0.16 f1/f234 -0.61 f3/f4 1.47 f234/f56 -0.24 f4/f5 -10.48 f12/f345 1.44 f5/f6 -1.29 f345/f6 -1.50 f1/f23 -0.50 R5/R6 3.70 f23/f4 0.20 CT2/CT1 0.27 f23/f45 -1.89 CT3/CT2 0.88 f45/f6 -1.42 f/TL 0.88 V1-V2 35.63 V4-V3 35.63

In the six-piece imaging lens group provided by the present invention, the lens material can be plastic or glass. When the lens material is plastic, the production cost can be effectively reduced. When the lens material is glass, the six-piece imaging lens group can be increased in reflex Degree of freedom of force configuration. In addition, the object side surface and the image side surface of the lens in the six-element imaging lens group can be aspherical, and the aspherical surface can be easily made into a shape other than a spherical surface to obtain more control variables to reduce aberrations and thereby reduce the lens Therefore, the total length of the six-piece imaging lens set of the present invention can be effectively reduced.

In the six-piece imaging lens set provided by the present invention, for a lens with refractive power, if the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at the near optical axis; When the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at the near optical axis.

The six-piece imaging lens set provided by the present invention can be applied to a moving focusing optical system according to requirements, and has the characteristics of excellent aberration correction and good imaging quality, and can be applied to 3D (three-dimensional) image capture and digital In electronic imaging systems such as cameras, mobile devices, digital tablets or car photography.

To sum up, the above-mentioned embodiments and drawings are only preferred embodiments of the present invention, and should not be used to limit the scope of implementation of the present invention, that is, all equal changes and modifications made in accordance with the scope of the patent application of the present invention are all It should fall within the scope of the invention patent.

100, 200, 300, 400, 500, 600: aperture 110, 210, 310, 410, 510, 610: first lens 111, 211, 311, 411, 511, 611: Object side surface 112, 212, 312, 412, 512, 612: image side surface 120, 220, 320, 420, 520, 620: second lens 121, 221, 321, 421, 521, 621: Object side surface 122, 222, 322, 422, 522, 622: image side surface 130, 230, 330, 430, 530, 630: third lens 131, 231, 331, 431, 531, 631: Object side surface 132, 232, 332, 432, 532, 632: image side surface 140, 240, 340, 440, 540, 640: fourth lens 141, 241, 341, 441, 541, 641: Object side surface 142, 242, 342, 442, 542, 642: image side surface 150, 250, 350, 450, 550, 650: fifth lens 151, 251, 351, 451, 551, 651: Object side surface 152, 252, 352, 452, 552, 652: image side surface 160, 260, 360, 460, 560, 660: sixth lens 161, 261, 361, 461, 561, 661: Object side surface 162, 262, 362, 462, 562, 662: image side surface 170, 270, 370, 470, 570, 670: infrared filter element 180, 280, 380, 480, 580, 680: imaging surface 190, 290, 390, 490, 590, 690: optical axis f: focal length of the six-element imaging lens group Fno: The aperture value of the six-element imaging lens group FOV: The largest angle of view in the six-element imaging lens group f1: focal length of the first lens f2: the focal length of the second lens f3: focal length of the third lens f4: focal length of the fourth lens f5: focal length of the fifth lens f6: focal length of the sixth lens f12: The combined focal length of the first lens and the second lens f23: The combined focal length of the second lens and the third lens f34: The combined focal length of the third lens and the fourth lens f45: The combined focal length of the fourth lens and the fifth lens f56: The combined focal length of the fifth lens and the sixth lens f123: The combined focal length of the first lens, the second lens and the third lens f234: The combined focal length of the second lens, the third lens and the fourth lens f345: The combined focal length of the third lens, the fourth lens and the fifth lens f456: The combined focal length of the fourth lens, the fifth lens and the sixth lens R5: Curvature radius of the object side surface of the third lens R6: The curvature radius of the image side surface of the third lens V1: Dispersion coefficient of the first lens V2: Dispersion coefficient of the second lens V3: Dispersion coefficient of the third lens V4: Dispersion coefficient of the fourth lens TL: The distance from the object side surface of the first lens to the imaging surface on the optical axis

FIG. 1A is a schematic diagram of a six-piece imaging lens set according to the first embodiment of the present invention. Fig. 1B is a graph showing the curvature of field and the distortion of the six-piece imaging lens set in the first embodiment from left to right. Fig. 2A is a schematic diagram of a six-piece imaging lens set according to the second embodiment of the present invention. Fig. 2B is a graph showing the curvature of field and the distortion of the six-piece imaging lens set in the second embodiment from left to right. FIG. 3A is a schematic diagram of a six-piece imaging lens set according to the third embodiment of the present invention. Fig. 3B is a graph showing curvature of field and distortion tolerance of the six-piece imaging lens set in the third embodiment, from left to right. Fig. 4A is a schematic diagram of a six-piece imaging lens set according to a fourth embodiment of the present invention. Fig. 4B is a graph showing curvature of field and distortion tolerance of the six-piece imaging lens set in the fourth embodiment from left to right. FIG. 5A is a schematic diagram of a six-piece imaging lens set according to the fifth embodiment of the present invention. Fig. 5B is a graph showing curvature of field and distortion tolerance of the six-piece imaging lens set of the fifth embodiment in order from left to right. Fig. 6A is a schematic diagram of a six-piece imaging lens set according to a sixth embodiment of the present invention. Fig. 6B is a graph showing the curvature of field and the distortion of the six-piece imaging lens set in the sixth embodiment from left to right.

100: aperture

110: first lens

111: Object side surface

112: Image side surface

120: second lens

121: Object side surface

122: image side surface

130: third lens

131: Object side surface

132: Image side surface

140: fourth lens

141: Object side surface

142: Image side surface

150: fifth lens

151: Object side surface

152: image side surface

160: sixth lens

161: Object side surface

162: Image side surface

170: Infrared filter element

180: imaging surface

190: optical axis

Claims (23)

A six-element imaging lens group, including an aperture and an optical group composed of six lenses, from the object side to the image side in order: the aperture; a first lens with positive refractive power, the first lens The object side surface of the first lens is convex near the optical axis, the image side surface of the first lens is concave near the optical axis, and at least one of the object side surface and the image side surface of the first lens is aspherical; a second lens, With negative refractive power, the object side surface of the second lens is convex near the optical axis, the image side surface of the second lens is concave near the optical axis, and at least one of the object side surface and the image side surface of the second lens Is an aspherical surface; a third lens has refractive power, at least one of the object side surface and image side surface of the third lens is aspherical; a fourth lens has negative refractive power, the object side surface of the fourth lens The near optical axis is convex, the image side surface of the fourth lens is concave near the optical axis, at least one of the object side surface and the image side surface of the fourth lens is aspherical, and the object side surface of the fourth lens is At least one surface of the image side surface has at least one inflection point; a fifth lens with positive refractive power, the object side surface of the fifth lens is convex near the optical axis, and the image side surface of the fifth lens is near the optical axis Is a convex surface, at least one of the object side surface and the image side surface of the fifth lens is aspherical, and at least one of the object side surface and the image side surface of the fifth lens has at least one inflection point; and a sixth lens, With negative refractive power, the object side surface of the sixth lens is concave near the optical axis, the image side surface of the sixth lens is concave near the optical axis, and the object side surface and the image side surface of the sixth lens are at least One surface is aspherical, and at least one surface of the object side surface and the image side surface of the sixth lens has at least one inflection point; wherein the composite focal length of the first lens and the second lens is f12, and the third lens and the fourth lens The composite focal length of the lens is f34 and meets the following conditions: -0.65<f12/f34<-0.15. The six-piece imaging lens group according to claim 1, wherein the focal length of the first lens is f1, and the focal length of the second lens is f2, and the following conditions are met: -0.6<f1/f2<-0.3. The six-piece imaging lens group according to claim 1, wherein the focal length of the second lens is f2, and the focal length of the third lens is f3, and the following conditions are met: -0.03<f2/f3<0.43. The six-piece imaging lens group according to claim 1, wherein the focal length of the third lens is f3, and the focal length of the fourth lens is f4, and the following conditions are met: -81<f3/f4<3.1. The six-piece imaging lens group according to claim 1, wherein the focal length of the fourth lens is f4, and the focal length of the fifth lens is f5, and the following conditions are satisfied: -13.6<f4/f5<-3.3. The six-piece imaging lens group according to claim 1, wherein the focal length of the fifth lens is f5, and the focal length of the sixth lens is f6, and the following conditions are met: -1.7<f5/f6<-0.75. The six-piece imaging lens group according to claim 1, wherein the focal length of the first lens is f1, the combined focal length of the second lens and the third lens is f23, and the following conditions are met: -0.70<f1/f23< -0.30. The six-piece imaging lens group according to claim 1, wherein the combined focal length of the second lens and the third lens is f23, and the focal length of the fourth lens is f4, and the following conditions are met: 0.1<f23/f4<0.85 . The six-piece imaging lens group according to claim 1, wherein the combined focal length of the second lens and the third lens is f23, and the combined focal length of the fourth lens and the fifth lens is f45, and the following conditions are met: -3.0 <f23/f45<-1.0. The six-piece imaging lens group according to claim 1, wherein the combined focal length of the fourth lens and the fifth lens is f45, the focal length of the sixth lens is f6, and the following conditions are met: -1.9<f45/f6< -0.85. The six-piece imaging lens group according to claim 1, wherein the composite focal length of the third lens and the fourth lens is f34, and the composite focal length of the fifth lens and the sixth lens is f56, and the following conditions are met:- 1.25<f34/f56<-0.15. The six-piece imaging lens group according to claim 1, wherein the composite focal length of the first lens, the second lens, and the third lens is f123, and the composite focal length of the fourth lens and the fifth lens is f45, and meets the following requirements Condition: 1.0<f123/f45<2.5. The six-piece imaging lens group according to claim 1, wherein the composite focal length of the first lens, the second lens and the third lens is f123, and the composite focal length of the fourth lens, the fifth lens and the sixth lens is f456 , And meet the following conditions: -0.35<f123/f456<0.15. The six-piece imaging lens group according to claim 1, wherein the focal length of the first lens is f1, the combined focal length of the second lens, the third lens and the fourth lens is f234, and the following conditions are met: -1.05< f1/f234<-0.45. The six-piece imaging lens group according to claim 1, wherein the composite focal length of the second lens, the third lens and the fourth lens is f234, and the composite focal length of the fifth lens and the sixth lens is f56, and meets the following requirements Condition: -0.55<f234/f56<-0.15. The six-piece imaging lens group according to claim 1, wherein the composite focal length of the first lens and the second lens is f12, and the composite focal length of the third lens, the fourth lens and the fifth lens is f345, and meets the following requirements Condition: 1.0<f12/f345<2.15. The six-piece imaging lens group according to claim 1, wherein the combined focal length of the third lens, the fourth lens and the fifth lens is f345, the focal length of the sixth lens is f6, and the following conditions are met: -1.95< f345/f6<-0.9. The six-piece imaging lens set according to claim 1, wherein the object side surface of the third lens has a curvature radius of R5, and the image side surface of the third lens has a curvature radius of R6, and the following conditions are met: -2.0<R5 /R6<4.8. The six-piece imaging lens set according to claim 1, wherein the thickness of the second lens on the optical axis is CT2, and the thickness of the first lens on the optical axis is CT1, and the following conditions are met: 0.15<CT2/ CT1<0.45. The six-piece imaging lens set according to claim 1, wherein the thickness of the third lens on the optical axis is CT3, and the thickness of the second lens on the optical axis is CT2, and the following conditions are met: 0.60<CT3/ CT2<1.35. The six-piece imaging lens group according to claim 1, wherein the overall focal length of the six-piece imaging lens group is f, and the distance from the object side surface of the first lens to the imaging surface on the optical axis is TL, and satisfies The following conditions: 0.6<f/TL<1.2. The six-piece imaging lens set according to claim 1, wherein the dispersion coefficient of the first lens is V1, and the dispersion coefficient of the second lens is V2, and the following conditions are met: 30<V1-V2<42. The six-piece imaging lens set according to claim 1, wherein the dispersion coefficient of the third lens is V3, and the dispersion coefficient of the fourth lens is V4, and the following conditions are met: 30<V4-V3<42.

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