TW202037956A - Five-piece optical lens system with a wide field of view - Google Patents

Abstract

A five-piece optical lens system with a wide field of view includes, in order from the object side to the image side: a first lens element with a negative refractive power, a stop, a second lens element with a positive refractive power, a third lens element with a negative refractive power, a fourth lens element with a positive refractive power, a fifth lens element with a negative refractive power, a radius of curvature of an object-side surface of the second lens element is R3, a radius of curvature of an image-side surface of the second lens element is R4, focal lengths of the system, first, second and fourth lens elements are f, f1, f2, f4, respectively, satisfying the relations: 1.9 mm ＜ f+(R3+R4)/(R3-R4)＜ 2.9 mm, -2.0 mm ＜f1/(f2*f4)＜-1.2 mm. Such arrangements can provide a five-piece optical lens system which has a wide field of view, high resolution, short length and less distortion.

Description

Five-element wide-angle lens group

The present invention is related to a five-piece wide-angle lens set, in particular to a miniaturized five-piece wide-angle lens set applied to electronic products.

With the development of high-standard mobile devices such as smartphones and tablets, high-quality small camera lenses have become standard equipment. With the popularity of the Internet community, more and more people like to take photos or take selfies with others Sharing, such as game consoles, driving recorders, security camera lenses, etc., have an increasing demand for shooting angles, so the requirements for lens shooting angles and image quality are becoming more and more stringent. The conventional US 8335043 and US 8576497 use 2 lens groups, 5~6 elements to achieve the purpose of large angle, but the distortion (distortion) is too large, and the maximum angle of view (FOV) of US 8593737, US8576497, US 8395853 are all Less than 85 degrees, and the total length (TL) of the lens group is too long.

Secondly, for photographic lenses used in biomedicine, driving recorders, cameras, or other electronic products, the requirements for large apertures do not need to be too strict. Instead, it is the angle of view and lens length that the industry needs to solve further. However, the current traditional photographic lenses mounted on electronic products in the aforementioned fields mostly adopt a four-element lens structure, and all have defects such as insufficient angle of view and excessively long lens length.

Therefore, how to develop a wide-angle lens group with wide viewing angle, high resolution capability, short lens length, and small distortion is the motivation of the present invention.

The object of the present invention is to provide a five-element wide-angle lens set, especially a five-element wide-angle lens set with wide viewing angle, high resolution capability, short lens length, and small distortion.

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

The radius of curvature of the object side surface of the second lens is R3, the radius of curvature of the image side surface of the second lens is R4, the overall focal length of the five-piece wide-angle lens group is f, and the focal length of the first lens is f1. The focal length of the second lens is f2, the focal length of the fourth lens is f4, and meets the following conditions: 1.9 mm< f+(R3+R4)/(R3-R4)<2.9 mm and -2.0 mm<f1/ (f2*f4)<-1.2mm.

Preferably, the overall focal length of the five-piece wide-angle lens group is f, and the focal length of the first lens is f1, and the following conditions are satisfied: -0.68 <f/f1 <-0.26. In this way, the refractive power of the first lens is maintained in a proper range, and the angle of view (FOV) of the five-piece wide-angle lens group is maintained at a proper angle, while reducing the assembly sensitivity of the first lens.

Preferably, the combined focal length of the third lens, the fourth lens and the fifth lens is f345, and the overall focal length of the five-piece wide-angle lens group is f, and the following conditions are satisfied: -13.0 <f345/f <28.5. In this way, the configuration of the refractive power of the object-side end and the image-side end of the five-element wide-angle lens assembly helps to meet the requirements of better aberration balance and miniaturization.

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 met: 0.29 <f23/f45 <0.87. In this way, it is beneficial to obtain a wide angle of view (field angle) and effectively correct the curvature of the field.

Preferably, the focal length of the first lens is f1, and the combined focal length of the second lens, the third lens, the fourth lens and the fifth lens is f2345, and the following conditions are met: -4.0 <f1/f2345 <-1.6 . In this way, when f1/f2345 satisfies the aforementioned relational expression, the five-element wide-angle lens group can have a large angle of view, while the resolution capability is significantly improved. On the contrary, if the data value range of the above optical formula is exceeded, it will cause The five-element wide-angle lens group has problems such as low performance, low resolution, and insufficient yield.

Preferably, the radius of curvature of the image side surface of the first lens is R2, the focal length of the first lens is f1, and the following conditions are met: -19.6 <R2/f1 <6.7. As a result, the five-element wide-angle lens set has the performance of low length, large aperture, and long-range imaging quality.

Preferably, the radius of curvature of the image side surface of the first lens is R2, and the radius of curvature of the object side surface of the first lens is R1, and the following conditions are satisfied: -34.6 <R2/R1 <13.5. In this way, the five-element wide-angle lens set has a large viewing angle function and meets the demand for miniaturization.

Preferably, the radius of curvature of the object side surface of the fourth lens is R7, and the radius of curvature of the image side surface of the fourth lens is R8, and the following conditions are met: 2.2 <R7/R8 <17.8. Thereby, the surface shape of the fourth lens can be balanced, and the symmetry of the five-piece wide-angle lens group can be increased to maintain a better imaging quality.

Preferably, the thickness of the fourth lens on the optical axis is CT4, and the thickness of the fifth lens on the optical axis is CT5, and the following conditions are met: 1.3 <CT4/CT5 <3.8. In this way, the five-piece wide-angle lens group is further miniaturized.

Preferably, the distance from the object side surface of the first lens to the imaging surface on the optical axis is TL, the overall focal length of the five-piece wide-angle lens group is f, and the following conditions are met: 1.9 <TL/f <3.35 . In this way, it is beneficial to obtain a wide angle of view (field of view) and to maintain the miniaturization of the five-piece wide-angle lens set for mounting on thin and light electronic products.

Preferably, the distance from the object side surface of the first lens to the imaging surface on the optical axis is TL, and the imaging height that the five-piece wide-angle lens group can capture on the imaging surface is IMH, and the following conditions are met: 1.3 ＜TL/IMH ＜2.3. Thereby, a balance can be achieved between reducing the volume of the five-piece wide-angle lens group and increasing the area of the imaging surface.

Preferably, the distance from the image side surface of the fifth lens to the imaging surface on the optical axis is BFL, and the distance from the object side surface of the first lens to the imaging surface on the optical axis is TL, and meets the following conditions: 0.14 <BFL/TL <0.27. Thereby, a balance can be achieved between reducing the volume of the five-piece wide-angle lens group and increasing the area of the imaging surface.

Preferably, the dispersion coefficient of the second lens is V2, and the dispersion coefficient of the third lens is V3, and the following condition is satisfied: 30<V2-V3<42. Thereby, the second lens and the third lens can be matched with each other to reduce the chromatic aberration of the five-piece wide-angle lens group.

Preferably, the dispersion coefficient of the fourth lens is V4, and the dispersion coefficient of the fifth lens is V5, and the following condition is satisfied: 30<V4-V5<42. Thereby, the fourth lens and the fifth lens can be matched with each other to reduce the chromatic aberration of the five-piece wide-angle lens group.

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

<First embodiment>

Please refer to Figures 1A and 1B, where Figure 1A shows a schematic diagram of a five-element wide-angle lens set according to a first embodiment of the present invention, and Figure 1B shows the five-element wide-angle 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 five-piece wide-angle lens group includes an aperture 100 and an optical group. The optical group 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 infrared filter element 160, the protective glass 170, and the imaging surface 180, wherein there are five lenses with refractive power in the five-piece wide-angle lens group. The aperture 100 is arranged between the first lens 110 and the second lens 120.

The first lens 110 has a negative refractive power and is made of plastic. Its object side surface 111 is concave 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 positive 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 convex near the optical axis 190, and the object side surface 121 and the image side are convex. 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 convex 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 The surfaces 132 are all aspherical.

The fourth lens 140 has a positive refractive power and is made of plastic. Its object side surface 141 is concave near the optical axis 190, and its image side surface 142 is convex near the optical axis 190. The object side surface 141 and the image side The surfaces 142 are all aspherical.

The fifth lens 150 has a negative 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 concave near the optical axis 190, and the object side surface 151 and the image side The surface 152 is aspherical, and at least one of the object side surface 151 and the image side surface 152 has at least one inflection point.

The infrared filter element 170 is made of glass, which is arranged between the fifth lens 150 and the imaging surface 180 and does not affect the focal length of the five-piece wide-angle lens group.

The curve equation of the aspherical surface of each lens is 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, G, ... are Higher-order aspheric coefficients.

In the five-element wide-angle lens group of the first embodiment, the focal length of the five-element wide-angle lens group is f, and the f-number of the five-element wide-angle lens group is Fno. The field angle (picture angle) is FOV, and its value is as follows: f=2.09 (mm); Fno= 2.20; and FOV= 124.3 (degrees).

In the five-element wide-angle lens group of the first embodiment, the radius of curvature of the object-side surface 121 of the second lens 120 is R3, and the curvature radius of the image-side surface 122 of the second lens 120 is R4. The five-element wide-angle lens group The overall focal length of is f, and meets the following conditions: f+(R3+R4)/(R3-R4)=2.639 mm.

In the five-element wide-angle lens set of the first embodiment, the focal length of the first lens 110 is f1, the focal length of the second lens 120 is f2, the focal length of the fourth lens 140 is f4, and the following conditions are met: f1/ (f2*f4)=-1.736 mm.

In the five-piece wide-angle lens group of the first embodiment, the overall focal length of the five-piece wide-angle lens group is f, and the focal length of the first lens 110 is f1, and the following conditions are met: f/f1 = -0.355.

In the five-element wide-angle 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, and the overall focal length of the five-element wide-angle lens group is f, and meets the following requirements Conditions: f345/f = -10.85.

In the five-element wide-angle lens set of the first embodiment, the composite focal length of the second lens 120 and the third lens 130 is f23, and the composite focal length of the fourth lens 140 and the fifth lens 150 is f45, and the following conditions are met: f23/f45 = 0.464.

In the five-element wide-angle 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, the fourth lens 140, and the fifth lens 150 is f2345, and The following conditions are met: f1/f2345 = -3.209.

In the five-element wide-angle lens set of the first embodiment, the radius of curvature of the image side surface 112 of the first lens 110 is R2, the focal length of the first lens 110 is f1, and the following conditions are satisfied: R2/f1=-5.683.

In the five-element wide-angle lens set of the first embodiment, the radius of curvature of the image side surface 112 of the first lens 110 is R2, and the radius of curvature of the object side surface 111 of the first lens 110 is R1, and the following conditions are satisfied: R2/ R1 =-9.385.

In the five-element wide-angle lens group of the first embodiment, the radius of curvature of the object side surface 141 of the fourth lens 140 is R7, and the radius of curvature of the image side surface 142 of the fourth lens 140 is R8, and the following conditions are met: R7/ R8 = 4.752.

In the five-element wide-angle lens set of the first embodiment, the thickness of the fourth lens 140 on the optical axis 190 is CT4, and the thickness of the fifth lens 150 on the optical axis 190 is CT5, and the following conditions are met: CT4/ CT5 = 2.079.

In the five-element wide-angle lens group of the first embodiment, 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 the overall focal length of the five-element wide-angle lens group is f, And meet the following conditions: TL/f = 2.441.

In the five-piece wide-angle lens group of the first embodiment, 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 the five-piece wide-angle lens group can capture images on the imaging surface 180. The imaging height taken is IMH, and the following conditions are met: TL/IMH = 1.675.

In the five-element wide-angle lens set of the first embodiment, the distance on the optical axis 190 from the image side surface 152 of the fifth lens 150 to the imaging surface 180 is BFL, and the object side surface 111 of the first lens 110 to the imaging surface The distance of 180 on the optical axis 190 is TL, and meets the following conditions: BFL/TL = 0.214.

In the five-element wide-angle lens set of the first embodiment, the dispersion coefficient of the second lens 120 is V2, and the dispersion coefficient of the third lens 130 is V3, and the following conditions are satisfied: V2-V3=35.5.

In the five-element wide-angle lens set of the first embodiment, the dispersion coefficient of the fourth lens 140 is V4, and the dispersion coefficient of the fifth lens 150 is V5, and the following conditions are satisfied: V4-V5=35.5.

Refer to Table 1 and Table 2 below for cooperation.

Table 1 First embodiment f (focal length) = 2.09 mm (mm), Fno (aperture value) = 2.20, FOV (angle of view) = 124.3 deg. (degrees) surface To Radius of curvature thickness Material Refractive index Dispersion coefficient focal length 0 Subject unlimited unlimited To To To To 1 To unlimited 0.000 To To To To 2 First lens -3.571 (ASP) 0.289 plastic 1.54 55.9 -5.9 3 To 33.515 (ASP) 0.652 To To To To 4 aperture unlimited To -0.007 To To To To 5 Second lens 4.183 (ASP) 0.869 plastic 1.54 55.9 1.85 6 To -1.230 (ASP) 0.030 To 　 　 　 7 Third lens 3.209 (ASP) 0.262 plastic 1.66 20.4 -4.76 8 To 1.542 (ASP) 0.363 To 　 　 　 9 Fourth lens -4.166 (ASP) 0.986 plastic 1.54 55.9 1.84 10 To -0.877 (ASP) 0.099 To 　 　 　 11 Fifth lens 1.984 (ASP) 0.474 plastic 1.66 20.4 -2.04 12 To 0.729 (ASP) 0.500 To To To To 13 Infrared filter Filter unlimited 0.210 glass 1.52 64.2 To 14 To unlimited 0.381 To To To To 15 Imaging surface unlimited - To To To To

Table 2 Aspheric coefficient flat 2 3 5 6 7 K: -6.6980E+01 -9.9536E+01 1.1551E+01 -8.7167E-01 -2.0205E+00 A: 3.2691E-01 5.9362E-01 -1.1537E-02 1.8579E-01 -5.3616E-02 B: -3.1984E-01 -6.8637E-03 -1.9254E-01 -1.1648E+00 -6.6716E-01 C: 3.7305E-01 -2.6524E+00 3.2205E-01 4.0613E+00 2.3951E+00 D: -3.4073E-01 1.1213E+01 9.9905E-01 -1.0525E+01 -5.1253E+00 E: 2.1485E-01 -2.1791E+01 -1.1465E+01 1.6987E+01 6.3616E+00 F -7.9942E-02 2.1743E+01 2.4855E+01 -1.5507E+01 -4.2605E+00 G 1.2209E-02 -8.7842E+00 -1.6141E+01 5.8177E+00 1.1369E+00 flat 8 9 10 11 12 K: -1.5638E+00 3.8804E+00 -2.0116E+00 -2.6686E+01 -4.3636E+00 A: -2.0622E-01 1.5541E-01 1.1737E-01 -3.3118E-02 -1.3892E-01 B: 2.2264E-01 -2.4171E-01 -2.6197E-01 -2.3778E-01 6.2658E-02 C: -2.7214E-01 3.8544E-01 2.8842E-01 3.0306E-01 -1.6139E-02 D: 2.8447E-01 -3.1944E-01 -1.9760E-01 -1.9695E-01 1.0313E-03 E: -2.1326E-01 1.3276E-01 1.0415E-01 6.8642E-02 4.3493E-04 F 9.3521E-02 -2.2723E-02 -3.3800E-02 -1.1896E-02 -1.0449E-04 G -1.8213E-02 9.1738E-05 4.5385E-03 8.0549E-04 7.1313E-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 0-15 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 cone coefficient in the aspheric curve equation, and A, B, C, D, E, F, G... are high-order aspheric surface coefficients. In addition, the following example tables correspond to the schematic diagrams and field curvature and distortion tolerance curves of the respective examples. The definitions of the data in the tables are the same as those in Table 1 and Table 2 of the first embodiment. Add more details.

<Second embodiment>

Please refer to Figures 2A and 2B, where Figure 2A shows a schematic diagram of a five-element wide-angle lens set according to a second embodiment of the present invention, and Figure 2B shows the five-element wide-angle lens set of the second embodiment in order from left to right The curvature of the image plane and the distortion of the curve graph. It can be seen from FIG. 2A that the five-piece wide-angle lens group includes an aperture 200 and an optical group. The optical group 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 infrared filter element 270, and the imaging surface 280, wherein there are five lenses with refractive power in the five-piece wide-angle lens group. The aperture 200 is arranged between the first lens 210 and the second lens 220.

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

The second lens 220 has a positive 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 convex near the optical axis 290, and the object side surface 221 and the image side are convex. 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 convex 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 The surfaces 232 are all aspherical.

The fourth lens 240 has a positive refractive power and is made of plastic. Its object side surface 241 is concave near the optical axis 290, and its image side surface 242 is convex near the optical axis 290, and the object side surface 241 and the image side The surfaces 242 are all aspherical.

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

The infrared filter element 270 is made of glass, which is arranged between the fifth lens 250 and the imaging surface 280 and does not affect the focal length of the five-piece wide-angle lens group.

Refer to Table 3 and Table 4 below for cooperation.

table 3 Second embodiment f (focal length) = 2.09 mm (mm), Fno (aperture value) = 2.20, FOV (angle of view) = 121 deg. (degrees) surface To Radius of curvature thickness Material Refractive index Dispersion coefficient focal length 0 Subject unlimited unlimited To To To To 1 To unlimited 0.000 To To To To 2 First lens -2.965 (ASP) 0.303 plastic 1.54 55.9 -6.35 3 To -21.246 (ASP) 0.653 To To To To 4 aperture unlimited To -0.011 To To To To 5 Second lens 4.138 (ASP) 0.930 plastic 1.54 55.9 1.77 6 To -1.161 (ASP) 0.030 To 　 　 　 7 Third lens 3.088 (ASP) 0.272 plastic 1.66 20.4 -4.44 8 To 1.457 (ASP) 0.389 To 　 　 　 9 Fourth lens -3.237 (ASP) 0.945 plastic 1.54 55.9 2.06 10 To -0.919 (ASP) 0.079 To 　 　 　 11 Fifth lens 1.927 (ASP) 0.505 plastic 1.66 20.4 -2.32 12 To 0.767 (ASP) 0.500 To To To To 13 Infrared filter Filter unlimited 0.210 glass 1.52 64.2 To 14 To unlimited 0.325 To To To To 15 Imaging surface unlimited - To To To To

Table 4 Aspheric coefficient flat 2 3 5 6 7 K: -4.3835E+01 -9.6323E+01 1.5555E+01 -1.0786E+00 -3.7668E+00 A: 2.7566E-01 5.6309E-01 -5.1110E-02 1.7522E-01 -6.9378E-02 B: -2.2240E-01 -1.6557E-01 6.4500E-01 -8.4498E-01 -4.8265E-01 C: 1.8358E-01 -1.4312E+00 -8.5859E+00 2.5421E+00 2.0773E+00 D: -1.1799E-01 6.0508E+00 4.8424E+01 -6.4535E+00 -5.2584E+00 E: 5.8138E-02 -1.0881E+01 -1.4443E+02 1.0499E+01 7.4733E+00 F -1.9797E-02 1.0041E+01 2.0861E+02 -9.8897E+00 -5.6422E+00 G 2.9249E-03 -3.7836E+00 -1.1044E+02 3.8626E+00 1.7075E+00 flat 8 9 10 11 12 K: -1.7276E+00 2.8353E+00 -1.3299E+00 -1.5510E+01 -4.0931E+00 A: -2.4742E-01 1.8660E-01 2.0213E-01 -1.0223E-01 -1.6026E-01 B: 3.7827E-01 -3.2396E-01 -3.9775E-01 -1.8146E-01 8.2256E-02 C: -5.6206E-01 5.0690E-01 5.1104E-01 2.8721E-01 -2.6504E-02 D: 6.0820E-01 -4.2056E-01 -4.2728E-01 -2.0483E-01 4.5528E-03 E: -4.3195E-01 1.9432E-01 2.3474E-01 7.7155E-02 -3.0455E-04 F 1.7236E-01 -4.6125E-02 -7.0387E-02 -1.4506E-02 -1.6953E-05 G -2.9095E-02 3.7759E-03 8.4309E-03 1.0730E-03 2.6750E-06

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] 2.09 R2/R1 7.165 Fno 2.2 R7/R8 3.520 FOV[deg.] 121.0 CT4/CT5 1.871 f/f1 -0.329 TL/f 2.458 f345/f -5.759 TL/IMH 1.749 f23/f45 0.383 BFL/TL 0.202 f1/f2345 -3.404 f+(R3+R4)/(R3-R4) 2.649 R2/f1 3.345 V4-V5 35.5 V2-V3 35.5 f1/(f2*f4) -1.743

<The third embodiment>

Please refer to Figures 3A and 3B, where Figure 3A shows a schematic diagram of a five-element wide-angle lens set according to a third embodiment of the present invention, and Figure 3B shows the five-element wide-angle 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 five-piece wide-angle lens group includes an aperture 300 and an optical group. The optical group 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 infrared filter element 370, and the imaging surface 380, wherein there are five lenses with refractive power in the five-piece wide-angle lens group. The aperture 300 is arranged between the first lens 310 and the second lens 320.

The first lens 310 has a negative refractive power and is made of plastic. Its object-side surface 311 is concave near the optical axis 390, and its image-side surface 312 is convex 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 positive 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 convex 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 a negative refractive power and is made of plastic. The object side surface 331 is convex near the optical axis 390, and the 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 positive refractive power and is made of plastic material. Its object side surface 341 is concave near the optical axis 390, and its image side surface 342 is convex near the optical axis 390. The object side surface 341 and the image side The surfaces 342 are all aspherical.

The fifth lens 350 has negative 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 concave near the optical axis 390. The object side surface 351 and the image side The surface 352 is aspherical, and at least one of the object side surface 351 and the image side surface 352 has at least one inflection point.

The infrared filter element 370 is made of glass, which is arranged between the fifth lens 350 and the imaging surface 380 and does not affect the focal length of the five-piece wide-angle lens group.

Refer to Table 5 and Table 6 below for cooperation.

table 5 The third embodiment f (focal length) = 1.97 mm (mm), Fno (aperture value) = 2.40, FOV (angle of view) = 125 deg. (degrees) surface To Radius of curvature thickness Material Refractive index Dispersion coefficient focal length 0 Subject unlimited unlimited To To To To 1 To unlimited 0.000 To To To To 2 First lens -2.864 (ASP) 0.326 plastic 1.54 55.9 -5.07 3 To 82.550 (ASP) 0.602 To To To To 4 aperture unlimited To 0.006 To To To To 5 Second lens 4.597 (ASP) 1.007 plastic 1.54 55.9 1.62 6 To -1.008 (ASP) 0.030 To 　 　 　 7 Third lens 3.642 (ASP) 0.298 plastic 1.66 20.4 -3.8 8 To 1.444 (ASP) 0.394 To 　 　 　 9 Fourth lens -2.751 (ASP) 0.773 plastic 1.54 55.9 2.5 10 To -1.003 (ASP) 0.345 To 　 　 　 11 Fifth lens 1.208 (ASP) 0.313 plastic 1.66 20.4 -3.05 12 To 0.679 (ASP) 0.500 To To To To 13 Infrared filter Filter unlimited 0.110 glass 1.52 64.2 To 14 To unlimited 0.318 To To To To 15 Imaging surface unlimited - To To To To

Table 6 Aspheric coefficient flat 2 3 5 6 7 K: -3.6150E+01 -9.9500E+01 4.3931E+00 -1.0971E+00 -1.0984E+01 A: 3.4338E-01 6.5085E-01 -1.7385E-02 -1.1424E-03 -2.5718E-01 B: -4.0581E-01 -6.9346E-02 2.6026E-01 5.0867E-01 5.6594E-01 C: 5.0841E-01 -3.7883E+00 -4.3597E+00 -2.4419E+00 -1.2266E+00 D: -4.6433E-01 1.9142E+01 2.7076E+01 4.7521E+00 1.5816E+00 E: 2.7918E-01 -4.3618E+01 -8.7873E+01 -5.1328E+00 -1.2349E+00 F -9.3571E-02 5.0757E+01 1.1027E+02 2.2027E+00 3.6394E-01 G 1.2517E-02 -2.3407E+01 0.0000E+00 0.0000E+00 0.0000E+00 flat 8 9 10 11 12 K: -1.8612E+00 1.8107E+00 -1.1710E+00 -9.2524E+00 -3.9277E+00 A: -2.8276E-01 2.2416E-01 9.2094E-02 -1.6820E-01 -1.3794E-01 B: 3.4401E-01 -1.7599E-01 4.3696E-02 4.4042E-02 5.9372E-02 C: -2.7096E-01 -1.9957E-02 -1.6207E-01 -2.7066E-02 -1.8230E-02 D: 1.0164E-01 2.6167E-01 1.4335E-01 1.6463E-02 3.2113E-03 E: -9.8766E-03 -2.4790E-01 -4.1278E-02 -4.8835E-03 -2.4931E-04 F -3.0624E-03 9.8220E-02 8.0252E-04 7.2015E-04 -4.6000E-06 G 0.0000E+00 -1.4868E-02 8.3910E-04 -4.3498E-05 1.3709E-06

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] 1.97 R2/R1 -28.818 Fno 2.4 R7/R8 2.743 FOV[deg.] 125.0 CT4/CT5 2.475 f/f1 -0.390 TL/f 2.543 f345/f -4.153 TL/IMH 1.702 f23/f45 0.367 BFL/TL 0.185 f1/f2345 -2.897 f+(R3+R4)/(R3-R4) 2.615 R2/f1 -16.296 V4-V5 35.5 V2-V3 35.5 f1/(f2*f4) -1.252

<Fourth embodiment>

Please refer to Figures 4A and 4B, in which Figure 4A shows a schematic diagram of a five-element wide-angle lens set according to a fourth embodiment of the present invention, and Figure 4B shows the five-element wide-angle lens set of the fourth embodiment in order from left to right The curvature of the image plane and the distortion of the curve graph. It can be seen from FIG. 4A that the five-piece wide-angle lens group includes an aperture 400 and an optical group. The optical group 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 infrared filter element 470, and the imaging surface 480, wherein there are five lenses with refractive power in the five-piece wide-angle lens group. The aperture 400 is arranged between the first lens 410 and the second lens 420.

The first lens 410 has negative refractive power and is made of plastic. Its object side surface 411 is concave near the optical axis 490, and its image side surface 412 is convex 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 positive 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 convex near the optical axis 490. The object side surface 421 and the image side are convex. The surfaces 422 are all aspherical.

The third lens 430 has negative 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 concave near the optical axis 490. The object side surface 431 and the image side The surfaces 432 are all aspherical.

The fourth lens 440 has positive refractive power and is made of plastic. Its object-side surface 441 is concave near the optical axis 490, and its image-side surface 442 is convex near the optical axis 490. The object-side surface 441 and the image side are convex. The surfaces 442 are all aspherical.

The fifth lens 450 has a negative 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 concave near the optical axis 490. The object side surface 451 and the image side The surface 452 is aspherical, and at least one of the object side surface 451 and the image side surface 452 has at least one inflection point.

The infrared filter element 470 is made of glass, which is arranged between the fifth lens 450 and the imaging surface 480 and does not affect the focal length of the five-piece wide-angle lens group.

Refer to Table 7 and Table 8 below for cooperation.

Table 7 Fourth embodiment f (focal length) = 1.89 mm (mm), Fno (aperture value) = 2.20, FOV (angle of view) = 125.6 deg. (degrees) surface To Radius of curvature thickness Material Refractive index Dispersion coefficient focal length 0 Subject unlimited unlimited To To To To 1 To unlimited 0.000 To To To To 2 First lens -2.750 (ASP) 0.451 plastic 1.54 55.9 -5.56 3 To -30.842 (ASP) 0.667 To To To To 4 aperture unlimited To 0.004 To To To To 5 Second lens 4.216 (ASP) 0.965 plastic 1.54 55.9 1.53 6 To -0.954 (ASP) 0.030 To 　 　 　 7 Third lens 3.871 (ASP) 0.291 plastic 1.66 20.4 -3.21 8 To 1.335 (ASP) 0.457 To 　 　 　 9 Fourth lens -2.770 (ASP) 0.807 plastic 1.54 55.9 2.3 10 To -0.952 (ASP) 0.140 To 　 　 　 11 Fifth lens 1.145 (ASP) 0.353 plastic 1.66 20.4 -2.99 12 To 0.637 (ASP) 0.500 To To To To 13 Infrared filter Filter unlimited 0.110 glass 1.52 64.2 To 14 To unlimited 0.325 To To To To 15 Imaging surface unlimited - To To To To

Table 8 Aspheric coefficient flat 2 3 5 6 7 K: -3.8915E+01 2.1855E+01 1.0867E+01 -1.2031E+00 -2.2226E+01 A: 1.3206E-01 4.6416E-01 -1.1409E-02 3.3592E-01 1.2319E-02 B: -3.4944E-02 -5.3429E-01 -9.1234E-01 -2.1561E+00 -1.1774E+00 C: -1.0865E-02 1.4047E+00 1.0229E+01 8.5154E+00 4.8799E+00 D: 1.7466E-02 -2.6300E+00 -7.6253E+01 -2.2613E+01 -1.1403E+01 E: -6.5956E-03 2.9214E+00 3.1269E+02 3.5169E+01 1.5062E+01 F 7.7302E-04 -1.2602E+00 -6.8127E+02 -2.9921E+01 -1.0740E+01 G 0.0000E+00 0.0000E+00 6.1257E+02 1.0595E+01 3.1646E+00 flat 8 9 10 11 12 K: -1.9702E+00 2.3038E+00 -1.2894E+00 -7.6906E+00 -3.5444E+00 A: -3.1249E-01 2.2949E-01 9.5956E-02 -1.7066E-01 -1.8094E-01 B: 4.2522E-01 -2.7552E-01 5.4250E-02 1.0584E-02 9.8680E-02 C: -4.2666E-01 2.8656E-01 -2.5737E-01 2.3344E-02 -3.7097E-02 D: 2.6553E-01 -1.4468E-01 3.0207E-01 -1.3031E-02 8.7051E-03 E: -1.0064E-01 2.8307E-02 -1.5162E-01 3.8723E-03 -1.2179E-03 F 2.0741E-02 2.6683E-03 3.5178E-02 -5.9849E-04 8.9474E-05 G -1.9744E-03 -1.3892E-03 -3.1223E-03 3.6560E-05 -2.4637E-06

In the fourth 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.

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

Fourth embodiment f[mm] 1.89 R2/R1 11.215 Fno 2.4 R7/R8 2.910 FOV[deg.] 125.6 CT4/CT5 2.287 f/f1 -0.340 TL/f 2.692 f345/f -4.133 TL/IMH 1.717 f23/f45 0.424 BFL/TL 0.183 f1/f2345 -3.126 f+(R3+R4)/(R3-R4) 2.525 R2/f1 5.543 V4-V5 35.5 V2-V3 35.5 f1/(f2*f4) -1.587

<Fifth Embodiment>

Please refer to Figures 5A and 5B, where Figure 5A shows a schematic diagram of a five-element wide-angle lens set according to a fifth embodiment of the present invention, and Figure 5B shows the five-element wide-angle 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 five-element wide-angle 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 infrared filter element 570, and the imaging surface 580, wherein there are five lenses with refractive power in the five-piece wide-angle lens group. The aperture 500 is arranged between the first lens 510 and the second lens 520.

The first lens 510 has a negative 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, and the object side surface 511 and the image side The surfaces 512 are all aspherical.

The second lens 520 has a positive 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 convex near the optical axis 590, and the object side surface 521 and the image side are convex. The surfaces 522 are all aspherical.

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

The fourth lens 540 has positive refractive power and is made of plastic. Its object-side surface 541 is concave near the optical axis 590, and its image-side surface 542 is convex near the optical axis 590. The object-side surface 541 and the image side The surfaces 542 are all aspherical.

The fifth lens 550 has a negative 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 concave near the optical axis 590, and the object side surface 551 and the image side The surface 552 is aspherical, and at least one of the object side surface 551 and the image side surface 552 has at least one inflection point.

The infrared ray filter element 570 is made of glass, which is arranged between the fifth lens 550 and the imaging surface 580 and does not affect the focal length of the five-piece wide-angle lens group.

Refer to Table 9 and Table 10 below for cooperation.

Table 9 Fifth embodiment f (focal length) = 2.07 mm (mm), Fno (aperture value) = 2.20, FOV (angle of view) = 123.8 deg. (degrees) surface To Radius of curvature thickness Material Refractive index Dispersion coefficient focal length 0 Subject unlimited unlimited To To To To 1 To unlimited 0.000 To To To To 2 First lens 8.363 (ASP) 0.344 plastic 1.54 55.9 -4.92 3 To 2.002 (ASP) 0.552 To To To To 4 aperture unlimited To 0.007 To To To To 5 Second lens 8.598 (ASP) 0.811 plastic 1.54 55.9 1.92 6 To -1.153 (ASP) 0.053 To 　 　 　 7 Third lens 4.475 (ASP) 0.311 plastic 1.66 20.4 -4.64 8 To 1.778 (ASP) 0.283 To 　 　 　 9 Fourth lens -11.472 (ASP) 0.953 plastic 1.54 55.9 1.9 10 To -0.978 (ASP) 0.260 To 　 　 　 11 Fifth lens 2.169 (ASP) 0.460 plastic 1.66 20.4 -2.31 12 To 0.824 (ASP) 0.460 To To To To 13 Infrared filter Filter unlimited 0.210 glass 1.52 64.2 To 14 To unlimited 0.400 To To To To 15 Imaging surface unlimited - To To To To

Table 10 Aspheric coefficient flat 2 3 5 6 7 K: 4.0456E+01 2.7838E-01 -4.3709E+01 -1.6326E+00 1.7734E+01 A: 2.5800E-01 4.6430E-01 -5.4882E-02 -1.7254E-01 -2.8153E-01 B: -1.4963E-01 1.3673E-01 -4.3020E-01 2.8502E-02 3.3858E-01 C: 8.3934E-02 -6.2221E-01 1.0017E+00 -3.0929E-01 -5.2822E-01 D: -3.2730E-03 9.9842E-01 2.8355E+00 -2.0548E-01 4.2556E-01 E: -8.4390E-03 2.9802E+00 -3.9760E+01 9.6324E-01 -2.2861E-01 F -5.9767E-03 -5.4406E+00 7.4050E+01 -1.2711E+00 3.0080E-02 G 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 flat 8 9 10 11 12 K: -9.5885E+00 7.1180E+01 -2.4791E+00 -3.2020E+01 -5.0302E+00 A: -7.9775E-02 5.7809E-02 -2.6402E-02 -9.0988E-02 -9.0837E-02 B: 1.3949E-01 -2.1854E-02 1.0691E-02 -7.0804E-03 2.8463E-02 C: -1.4965E-01 6.0269E-02 1.3077E-02 -2.9019E-04 -6.3725E-03 D: 7.1005E-02 -5.4681E-02 -1.0371E-02 7.6312E-03 7.6330E-04 E: -9.2714E-03 2.3103E-02 1.0164E-02 -5.4486E-03 -5.6534E-05 F -4.0156E-03 -3.7836E-03 -2.7739E-03 1.0710E-03 1.8430E-06 G 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00

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] 2.07 R2/R1 0.239 Fno 2.2 R7/R8 11.735 FOV[deg.] 123.8 CT4/CT5 2.070 f/f1 -0.420 TL/f 2.470 f345/f 23.738 TL/IMH 1.674 f23/f45 0.728 BFL/TL 0.210 f1/f2345 -2.904 f+(R3+R4)/(R3-R4) 2.830 R2/f1 -0.407 V4-V5 35.5 V2-V3 35.5 f1/(f2*f4) -1.350

<Sixth Embodiment>

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

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

The second lens 620 has positive 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 convex near the optical axis 690, and 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 positive refractive power and is made of plastic. Its object side surface 641 is concave near the optical axis 690, and its image side surface 642 is convex near the optical axis 690, and the object side surface 641 and the image side The surfaces 642 are all aspherical.

The fifth lens 650 has negative 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 concave near the optical axis 690. The object side surface 651 and the image side The surface 652 is aspherical, and at least one of the object side surface 651 and the image side surface 652 has at least one inflection point.

The infrared filter element 670 is made of glass, which is arranged between the fifth lens 650 and the imaging surface 680 without affecting the focal length of the five-piece wide-angle lens group.

Refer to Table 11 and Table 12 below for cooperation.

Table 11 Sixth embodiment f (focal length) = 2.05 mm (mm), Fno (aperture value) = 2.20, FOV (angle of view) = 124.2 deg. (degrees) surface To Radius of curvature thickness Material Refractive index Dispersion coefficient focal length 0 Subject unlimited unlimited To To To To 1 To unlimited 0.000 To To To To 2 First lens -3.288 (ASP) 0.296 plastic 1.54 55.9 -5.57 3 To 41.328 (ASP) 0.692 To To To To 4 aperture unlimited To -0.010 To To To To 5 Second lens 3.878 (ASP) 0.942 plastic 1.54 55.9 1.79 6 To -1.190 (ASP) 0.030 To 　 　 　 7 Third lens 3.077 (ASP) 0.260 plastic 1.66 20.4 -4.83 8 To 1.519 (ASP) 0.399 To 　 　 　 9 Fourth lens -3.494 (ASP) 0.850 plastic 1.54 55.9 2.23 10 To -0.980 (ASP) 0.068 To 　 　 　 11 Fifth lens 1.800 (ASP) 0.498 plastic 1.66 20.4 -2.61 12 To 0.787 (ASP) 0.502 To To To To 13 Infrared filter Filter unlimited 0.210 glass 1.52 64.2 To 14 To unlimited 0.380 To To To To 15 Imaging surface unlimited - To To To To

Table 12 Aspheric coefficient flat 2 3 5 6 7 K: -4.9228E+01 -3.9194E+01 1.3656E+01 -8.0403E-01 -7.2602E+00 A: 3.6977E-01 6.4964E-01 1.1348E-02 1.7053E-01 -5.3199E-02 B: -4.0806E-01 -2.0900E-01 -9.5845E-01 -1.0982E+00 -6.1328E-01 C: 5.3605E-01 -1.8776E+00 9.3167E+00 3.6285E+00 2.2338E+00 D: -5.3612E-01 1.0298E+01 -5.8373E+01 -8.6111E+00 -4.9285E+00 E: 3.5957E-01 -2.3093E+01 2.0685E+02 1.2808E+01 6.4178E+00 F -1.3466E-01 2.6299E+01 -3.9707E+02 -1.1190E+01 -4.6486E+00 G 1.9871E-02 -1.1908E+01 3.1816E+02 4.1718E+00 1.3784E+00 flat 8 9 10 11 12 K: -1.6499E+00 4.0815E+00 -1.3301E+00 -1.8272E+01 -4.0940E+00 A: -2.1046E-01 1.8223E-01 1.2122E-01 -8.4584E-02 -1.7344E-01 B: 2.0871E-01 -4.1094E-01 -1.8582E-01 -2.5275E-01 8.4718E-02 C: -2.2014E-01 6.7951E-01 8.5215E-02 3.4693E-01 -2.5996E-02 D: 2.2440E-01 -5.6707E-01 6.2639E-02 -2.1469E-01 4.4602E-03 E: -1.9168E-01 2.5200E-01 -5.3000E-02 7.0512E-02 -3.2383E-04 F 9.6602E-02 -5.4213E-02 1.0296E-02 -1.1662E-02 -1.6538E-05 G -2.0528E-02 3.3881E-03 -1.0075E-04 7.6188E-04 3.1120E-06

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] 2.05 R2/R1 -12.570 Fno 2.2 R7/R8 3.566 FOV[deg.] 124.2 CT4/CT5 1.709 f/f1 -0.368 TL/f 2.496 f345/f -7.916 TL/IMH 1.744 f23/f45 0.383 BFL/TL 0.213 f1/f2345 -3.061 f+(R3+R4)/(R3-R4) 2.581 R2/f1 -7.423 V4-V5 35.5 V2-V3 35.5 f1/(f2*f4) -1.399

<Seventh embodiment>

Please refer to FIGS. 7A and 7B, where FIG. 7A shows a schematic diagram of a five-element wide-angle lens set according to a seventh embodiment of the present invention, and FIG. 7B shows the five-element wide-angle lens set of the seventh 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. 7A that the five-element wide-angle lens group includes an aperture 700 and an optical group, which sequentially includes a first lens 710, a second lens 720, a third lens 730, and a fourth lens from the object side to the image side. The lens 740, the fifth lens 750, the infrared filter element 770, and the imaging surface 780, wherein there are five lenses with refractive power in the five-piece wide-angle lens group. The aperture 700 is arranged between the first lens 710 and the second lens 720.

The first lens 710 has a negative refractive power and is made of plastic. Its object side surface 711 is concave near the optical axis 790, and its image side surface 712 is concave near the optical axis 790, and the object side surface 711 and the image side are concave. The surfaces 712 are all aspherical.

The second lens 720 has positive refractive power and is made of plastic. Its object side surface 721 is convex near the optical axis 790, and its image side surface 722 is convex near the optical axis 790. The object side surface 721 and the image side The surfaces 722 are all aspherical.

The third lens 730 has a negative refractive power and is made of plastic. The object side surface 731 is convex near the optical axis 790, and the image side surface 732 is concave near the optical axis 790. The object side surface 731 and the image side The surfaces 732 are all aspherical.

The fourth lens 740 has positive refractive power and is made of plastic. Its object side surface 741 is concave near the optical axis 790, and its image side surface 742 is convex near the optical axis 790. The object side surface 741 and the image side The surfaces 742 are all aspherical.

The fifth lens 750 has negative refractive power and is made of plastic. Its object side surface 751 is convex near the optical axis 790, and its image side surface 752 is concave near the optical axis 790, and the object side surface 751 and the image side The surface 752 is aspherical, and at least one of the object-side surface 751 and the image-side surface 752 has at least one inflection point.

The infrared filter element 770 is made of glass material, which is arranged between the fifth lens 750 and the imaging surface 780 and does not affect the focal length of the five-piece wide-angle lens group.

Refer to Table 13 and Table 14 below for cooperation.

Table 13 Seventh embodiment f (focal length) = 1.64 mm (mm), Fno (aperture value) = 2.20, FOV (angle of view) = 124.6 deg. (degrees) surface To Radius of curvature thickness Material Refractive index Dispersion coefficient focal length 0 Subject unlimited 900 To To To To 1 To unlimited 0.000 To To To To 2 First lens -20.000 (ASP) 0.270 plastic 1.54 55.9 -2.92 3 To 1.742 (ASP) 0.570 To To To To 4 aperture unlimited To -0.022 To To To To 5 Second lens 2.787 (ASP) 0.742 plastic 1.54 55.9 1.72 6 To -1.289 (ASP) 0.083 To 　 　 　 7 Third lens 2.446 (ASP) 0.250 plastic 1.66 20.4 -6.3 8 To 1.483 (ASP) 0.209 To 　 　 　 9 Fourth lens -10.397 (ASP) 1.008 plastic 1.54 55.9 1.32 10 To -0.700 (ASP) 0.104 To 　 　 　 11 Fifth lens 1.487 (ASP) 0.320 plastic 1.66 20.4 -1.6 12 To 0.568 (ASP) 0.400 To To To To 13 Infrared filter Filter unlimited 0.210 glass 1.52 64.2 To 14 To unlimited 0.425 To To To To 15 Imaging surface unlimited - To To To To

Table 14 Aspheric coefficient flat 2 3 5 6 7 K: -1.1102E+00 -9.0000E+01 1.1779E+00 -1.5670E+00 -8.9569E+01 A: 6.6781E-01 2.6042E+00 -1.9425E-01 -9.3166E-01 -6.5379E-01 B: -1.0012E+00 -1.0859E+01 3.7950E+00 3.2690E+00 1.1033E+00 C: 1.3634E+00 4.8204E+01 -5.2477E+01 -9.4016E+00 -1.0230E+00 D: -1.1531E+00 -1.3283E+02 3.4652E+02 1.3593E+01 -1.0840E+00 E: 5.0032E-01 2.1622E+02 -1.1561E+03 -9.5222E+00 2.2128E+00 F -9.4180E-02 -1.5181E+02 1.5025E+03 -5.0493E-01 -1.2595E+00 G 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 flat 8 9 10 11 12 K: -5.6271E+00 -9.9441E+01 -1.3830E+00 -2.8863E+01 -4.7617E+00 A: -4.4725E-01 1.1904E-01 5.3867E-01 2.5813E-02 -1.3149E-01 B: 8.8861E-01 -1.8875E-01 -1.1232E+00 -4.2668E-01 3.5653E-02 C: -9.8644E-01 2.6127E-01 1.5819E+00 5.6198E-01 7.3716E-03 D: 3.5156E-01 -2.7459E-01 -1.4853E+00 -4.4946E-01 -1.3795E-02 E: 2.2838E-01 1.3111E-01 8.8893E-01 2.0182E-01 5.9394E-03 F -1.7436E-01 -2.3779E-02 -3.0306E-01 -4.4450E-02 -1.1942E-03 G 0.0000E+00 0.0000E+00 4.5257E-02 3.7015E-03 9.5992E-05

In the seventh 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 13 and Table 14, the following data can be calculated:

Seventh embodiment f[mm] 1.64 R2/R1 -0.087 Fno 2.2 R7/R8 14.856 FOV[deg.] 124.6 CT4/CT5 3.150 f/f1 -0.563 TL/f 2.779 f345/f 3.780 TL/IMH 1.904 f23/f45 0.681 BFL/TL 0.226 f1/f2345 -2.076 f+(R3+R4)/(R3-R4) 2.012 R2/f1 -0.596 V4-V5 35.5 V2-V3 35.5 f1/(f2*f4) -1.278

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

In the five-element wide-angle 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 five-element wide-angle lens set provided by the present invention can be applied to a moving focusing optical system according to the needs, 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.

100, 200, 300, 400, 500, 600, 700: aperture 110, 210, 310, 410, 510, 610, 710: first lens 111, 211, 311, 411, 511, 611, 711: Object side surface 112, 212, 312, 412, 512, 612, 712: image side surface 120, 220, 320, 420, 520, 620, 720: second lens 121, 221, 321, 421, 521, 621, 721: Object side surface 122, 222, 322, 422, 522, 622, 722: image side surface 130, 230, 330, 430, 530, 630, 730: third lens 131, 231, 331, 431, 531, 631, 731: Object side surface 132, 232, 332, 432, 532, 632, 732: image side surface 140, 240, 340, 440, 540, 640, 740: fourth lens 141, 241, 341, 441, 541, 641, 741: Object side surface 142, 242, 342, 442, 542, 642, 742: image side surface 150, 250, 350, 450, 550, 650, 750: fifth lens 151, 251, 351, 451, 551, 651, 751: Object side surface 152, 252, 352, 452, 552, 652, 752: image side surface 160, 260, 360, 470, 570, 670, 770: infrared filter element 180, 280, 380, 480, 580, 680, 780: imaging surface 190, 290, 390, 490, 590, 690, 790: optical axis f: Focal length of the five-element wide-angle lens group Fno: The aperture value of the five-element wide-angle lens group FOV: The largest field of view in the five-element wide-angle lens group f1: focal length of the first lens f2: the focal length of the second lens f4: focal length of the fourth lens f23: The combined focal length of the second lens and the third lens f45: The combined focal length of the fourth lens and the fifth lens f345: The combined focal length of the third lens, the fourth lens and the fifth lens f2345: The combined focal length of the second lens, the third lens, the fourth lens and the fifth lens R1: The radius of curvature of the object side surface of the first lens R2: The radius of curvature of the image side surface of the first lens R3: The radius of curvature of the object side surface of the second lens R4: The radius of curvature of the image side surface of the second lens R7: The radius of curvature of the object side surface of the fourth lens R8: The radius of curvature of the image side surface of the fourth lens CT4: The thickness of the fourth lens on the optical axis CT5: The thickness of the fifth lens on the optical axis V2: Dispersion coefficient of the second lens V3: Dispersion coefficient of the third lens V4: Dispersion coefficient of the fourth lens V5: Dispersion coefficient of the fifth lens TL: The distance from the object side surface of the first lens to the imaging surface on the optical axis IMH: The imaging height that the five-element wide-angle lens group can capture on the imaging surface BFL: The distance from the image side surface of the fifth lens to the imaging surface on the optical axis

Fig. 1A is a schematic diagram of a five-element wide-angle 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 five-element wide-angle lens set in the first embodiment from left to right. 2A is a schematic diagram of a five-element wide-angle 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 five-element wide-angle lens set of the second embodiment in order from left to right. 3A is a schematic diagram of a five-element wide-angle lens set according to the third embodiment of the present invention. FIG. 3B is a graph showing the curvature of field and the distortion of the five-element wide-angle lens set in the third embodiment from left to right. 4A is a schematic diagram of a five-element wide-angle lens set according to a fourth embodiment of the present invention. Fig. 4B is a graph showing the curvature of field and the distortion of the five-element wide-angle lens set in the fourth embodiment, from left to right. Fig. 5A is a schematic diagram of a five-element wide-angle lens set according to a fifth embodiment of the present invention. Fig. 5B is a graph showing the curvature of field and the distortion of the five-element wide-angle lens set in the fifth embodiment from left to right. Fig. 6A is a schematic diagram of a five-element wide-angle 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 five-element wide-angle lens group of the sixth embodiment in order from left to right. Fig. 7A is a schematic diagram of a five-element wide-angle lens set according to a seventh embodiment of the present invention. FIG. 7B is a graph showing the curvature of field and the distortion of the five-element wide-angle lens set of the seventh embodiment in order 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

170: Infrared filter element

180: imaging surface

190: optical axis

Claims (14)

A five-element wide-angle lens group, including an aperture and an optical group composed of five lenses, from the object side to the image side in order: A first lens having negative refractive power, and at least one of the object side surface and the image side surface of the first lens is aspherical; The aperture A second lens with positive 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 convex near the optical axis, and the object side surface of the second lens is At least one surface of the side surface is aspherical; A third lens with negative refractive power. The object side surface of the third lens is convex near the optical axis, and the image side surface of the third lens is concave near the optical axis. The object side surface of the second lens and the image At least one surface of the side surface is aspherical; A fourth lens with positive refractive power. The object side surface of the fourth lens is concave near the optical axis, and the image side surface of the fourth lens is convex near the optical axis. At least one of the side surfaces is aspherical; and A fifth lens with negative 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 concave near the optical axis. The object side surface of the fifth lens and the image At least one surface of the side surface is aspherical, and at least one surface of the object side surface and the image side surface of the fifth lens has at least one inflection point; The radius of curvature of the object side surface of the second lens is R3, the radius of curvature of the image side surface of the second lens is R4, the overall focal length of the five-piece wide-angle lens group is f, and the focal length of the first lens is f1. The focal length of the second lens is f2, and the focal length of the fourth lens is f4, and the following conditions are met: 1.9 mm <f+(R3+R4)/(R3-R4) <2.9 mm and -2.0 mm <f1/(f2*f4) <-1.2 mm. The five-element wide-angle lens group according to claim 1, wherein the overall focal length of the five-element wide-angle lens group is f, the focal length of the first lens is f1, and the following conditions are met: -0.68 ＜ f/f1 ＜- 0.26. The five-element wide-angle lens group according to claim 1, wherein the composite focal length of the third lens, the fourth lens and the fifth lens is f345, and the overall focal length of the five-element wide-angle lens group is f, and the following conditions are met : -13.0 <f345/f <28.5. The five-element wide-angle lens group according to claim 1, wherein 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: 0.29 ＜ f23/f45 <0.87. The five-element wide-angle lens group according to claim 1, wherein the focal length of the first lens is f1, and the combined focal length of the second lens, the third lens, the fourth lens and the fifth lens is f2345, and the following conditions are met : -4.0 <f1/f2345 <-1.6. The five-element wide-angle lens set according to claim 1, wherein the radius of curvature of the image side surface of the first lens is R2, and the focal length of the first lens is f1, and the following conditions are met: -19.6 <R2/f1 <6.7 . The five-element wide-angle lens set according to claim 1, wherein the radius of curvature of the image side surface of the first lens is R2, and the radius of curvature of the object side surface of the first lens is R1, and the following conditions are satisfied: -34.6 <R2 /R1 <13.5. The five-element wide-angle lens set according to claim 1, wherein the radius of curvature of the object side surface of the fourth lens is R7, and the radius of curvature of the image side surface of the fourth lens is R8, and the following conditions are met: 2.2 <R7/ R8 <17.8. For the five-element wide-angle lens group described in claim 1, the thickness of the fourth lens on the optical axis is CT4, and the thickness of the fifth lens on the optical axis is CT5, and the following conditions are met: 1.3 <CT4/CT5 ＜3.8. The five-piece wide-angle lens group according to claim 1, wherein the distance from the object-side surface of the first lens to the imaging surface on the optical axis is TL, and the overall focal length of the five-piece wide-angle lens group is f, and satisfies The following conditions: 1.9 <TL/f <3.35. The five-piece wide-angle lens set according to claim 1, wherein the distance from the object side surface of the first lens to the imaging surface on the optical axis is TL, and the five-piece wide-angle lens set can capture images on the imaging surface The height is IMH and meets the following conditions: 1.3 <TL/IMH <2.3. The five-element wide-angle lens set according to claim 1, wherein the distance from the image side surface of the fifth lens to the imaging surface on the optical axis is BFL, and the object side surface of the first lens to the imaging surface is on the optical axis The distance of is TL, and meets the following conditions: 0.14 <BFL/TL <0.27. The five-element wide-angle lens set according to claim 1, wherein the dispersion coefficient of the second lens is V2, and the dispersion coefficient of the third lens is V3, and the following conditions are satisfied: 30<V2-V3<42. The five-element wide-angle lens set according to claim 1, wherein the dispersion coefficient of the fourth lens is V4, and the dispersion coefficient of the fifth lens is V5, and the following conditions are satisfied: 30<V4-V5<42.

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