CN114063245B - Six-piece wide-angle lens group - Google Patents

Abstract

The invention discloses a six-piece wide-angle lens group, which comprises the following components in sequence from an object side to an image side: a first lens element with negative refractive power, an aperture stop, a second lens element with positive refractive power, a third lens element with negative refractive power, a fourth lens element with positive refractive power, a fifth lens element with positive refractive power, and a sixth lens element with negative refractive power; wherein the first lens element has an optical axis thickness of CT1, the third lens element has an optical axis thickness of CT3, the fourth lens element has an optical axis thickness of CT4, the fifth lens element has an optical axis thickness of CT5, and the sixth lens element has an optical axis thickness of CT6, and the following conditions are satisfied: 0.82< (CT4+ CT5)/(CT1+ CT3+ CT6) < 1.96; 2.07< (CT1+ CT6)/CT3< 5.52. Therefore, the invention provides a six-piece wide-angle lens group with wide visual angle, high resolution capability, short lens length and small distortion on the premise of considering the lens productivity.

Description

Six-piece wide-angle lens group

technical field

The invention relates to a six-piece wide-angle lens group, in particular to a miniaturized six-piece wide-angle lens group applied to electronic products.

Background technique

With the rise of electronic products with photographic functions, the demand for optical systems is increasing day by day. During shooting, in order to obtain a wider shooting range, the viewing angle of the lens needs to meet certain requirements, so the requirements for the shooting angle and image quality of the lens are becoming more and more strict. Usually the picture angle (FOV) of the lens is designed to be 50 degrees to 60 degrees. If it exceeds the above designed angle, not only the aberration is large, but the design of the lens is also more complicated. The prior art US 8335043 and US 8576497 use 2 lens groups and 5 to 6 lenses to achieve the purpose of large angle, but the distortion is too large, while for example US 8593737, US 8576497 and US 8395853, although they can achieve the purpose of large angle, But the total length (TL) of its lens group is too long.

Therefore, how to develop a miniaturized six-piece wide-angle lens group, which can not only be configured in electronic products such as lenses used in digital cameras, lenses used in network cameras, or mobile phone lenses, but also in lens production. Under the premise of stability, a wide-angle lens group with wide viewing angle, high resolution capability, short lens length, and small distortion is the motivation for the research and development of the present invention.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a six-piece wide-angle lens group, especially a six-piece wide-angle lens group with wide viewing angle, high resolution capability, short lens length, and small distortion under the premise of taking into account the productivity of the lens.

In order to achieve the aforementioned purpose, a six-piece wide-angle lens group provided according to the present invention includes an aperture and an optical group composed of six lenses. force, the object-side surface of the first lens is concave at the near-optical axis, the image-side surface of the first lens is concave at the near-optical axis, and the object-side surface and the image-side surface of the first lens are at least one surface is aspheric; the aperture; the second lens, with positive refractive power, the object side surface of the second lens is convex at the near-optical axis, and the image-side surface of the second lens is convex at the near-optical axis, so At least one surface of the object side surface and the image side surface of the second lens is aspherical; the third lens has a negative refractive power, the object side surface of the third lens is convex at the near optical axis, and the third lens has a convex surface. The image side surface is concave at the near optical axis, and at least one surface of the object side surface and the image side surface of the third lens is aspherical; the fourth lens has a positive refractive power, and the object side surface of the fourth lens is low beam The axis is convex, the image side surface of the fourth lens is concave at the near-optical axis, and at least one surface of the object side surface and the image side surface of the fourth lens is aspherical; the fifth lens has a positive refractive power, The object-side surface of the fifth lens is convex at the near-optical axis, the image-side surface of the fifth lens is convex at the near-optical axis, and at least one surface of the object-side surface and the image-side surface of the fifth lens is non-convex. A spherical surface, at least one surface of the object side surface and the image side surface of the fifth lens has at least one inflection point; and the sixth lens has a negative refractive power, and the object side surface of the sixth lens is convex at the near optical axis , the image side surface of the sixth lens is concave at the near optical axis, at least one surface of the object side surface and the image side surface of the sixth lens is aspherical, and the object side surface and the image side surface of the sixth lens at least one surface has at least one inflection point;

The thickness of the first lens on the optical axis is CT1, the thickness of the third lens on the optical axis is CT3, the thickness of the fourth lens on the optical axis is CT4, and the thickness of the fifth lens on the optical axis is CT4. The thickness on the axis is CT5, the thickness of the sixth lens on the optical axis is CT6, and the following conditions are met: 0.82<(CT4+CT5)/(CT1+CT3+CT6)<1.96; 2.07<(CT1+CT6 )/CT3<5.52.

Accordingly, when the conditions of (CT4+CT5)/(CT1+CT3+CT6) are met, the thickness distribution of the lenses in the six-piece wide-angle lens group can be balanced to avoid excessive differences in lens thicknesses and improper use of space. When the conditions of (CT1+CT6)/CT3 are met, the thickness distribution of the lenses in the six-piece wide-angle lens group can be balanced, so as to avoid excessive difference in lens thickness and lead to improper use of space, and at the same time, it can also strengthen the system control of the third lens ability.

Preferably, the overall focal length of the six-piece wide-angle lens group is f, the composite focal length of the fourth lens and the fifth lens is f45, and the following conditions are satisfied: 0.45<f/f45<1.34. Thus, the fourth lens and the fifth lens can cooperate with each other to correct off-axis aberrations.

Preferably, the composite focal length of the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens is f23456, the overall focal length of the six-piece wide-angle lens group is f, and the following conditions are met: : 0.56<f/f23456<1.51. Therefore, the resolution capability of the six-piece wide-angle lens group can be significantly improved while having a large picture angle.

Preferably, the focal length of the third lens is f3, the composite focal length of the fourth lens and the fifth lens is f45, and the following conditions are satisfied: -3.75<f3/f45<-1.62. Therefore, the refractive power of the fourth lens and the fifth lens is relatively suitable, which can effectively reduce the sensitivity of the imaging optical lens system.

Preferably, the composite 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 satisfied: -6.04<f6/f45<-0.95. As a result, the six-piece wide-angle lens group has a large picture angle, a high picture number, and a low lens height, and at the same time, the resolution capability is significantly improved.

Preferably, the thickness of the fourth lens on the optical axis is CT4, the thickness of the fifth lens on the optical axis is CT5, the thickness of the third lens on the optical axis is CT3, and the following conditions are met: : 3.78<(CT4+CT5)/CT3<8.38. It can also balance the thickness distribution of the lenses in the six-piece wide-angle lens group to avoid improper use of space due to excessive differences in lens thicknesses.

Preferably, the thickness of the second lens on the optical axis is CT2, the thickness of the third lens on the optical axis is CT3, and the following conditions are satisfied: 2.41<CT2/CT3<5.78. As a result, the thickness ratio of the second lens and the third lens can be adjusted to balance the space distribution of the six-piece wide-angle lens group, thereby improving yield and quality.

Preferably, the thickness of the sixth lens on the optical axis is CT6, the thickness of the third lens on the optical axis is CT3, and the following conditions are satisfied: 1.07<CT6/CT3<2.86. As a result, the thickness ratio of the third lens and the sixth lens can be adjusted to balance the space distribution of the six-piece wide-angle lens group, thereby improving the yield and quality, and at the same time enhancing the system control capability of the third lens.

Preferably, the thickness of the fourth lens on the optical axis is CT4, the thickness of the fifth lens on the optical axis is CT5, the thickness of the first lens on the optical axis is CT1, and the following conditions are met: : 1.41<(CT4+CT5)/CT1<7.4. It can also balance the thickness distribution of the lenses in the six-piece wide-angle lens group to avoid improper use of space due to excessive differences in lens thicknesses.

Preferably, the composite focal length of the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens is f23456, and the six-piece wide-angle lens group can capture the imaging height on the imaging plane. Half are IMH and satisfy the following conditions: 0.99<IMH/f23456<1.98. Therefore, a balance can be achieved between reducing the volume of the six-piece wide-angle lens group and increasing the area of the imaging surface.

Preferably, the overall focal length of the six-piece wide-angle lens group is f, the half of the imaging height that the six-piece wide-angle lens group can capture on the imaging plane is IMH, and the following conditions are met: 0.9<IMH/f <2.69. Therefore, a balance can be achieved between reducing the volume of the six-piece wide-angle lens group and increasing the area of the imaging surface.

Preferably, the distance from the image side surface of the sixth lens to the imaging surface on the optical axis is BFL, the overall focal length of the six-piece wide-angle lens group is f, and the following conditions are met: 0.79<f/BFL <2.17. Therefore, a balance can be achieved between reducing the volume of the six-piece wide-angle lens group and increasing the area of the imaging surface.

Preferably, half of the imaging height that the six-piece wide-angle lens group can capture on the imaging surface is IMH, the distance from the aperture to the imaging surface on the optical axis is CTSI, and the following conditions are met: 0.73<CTSI/ (IMH*2)<1.2. Therefore, a balance can be achieved between reducing the volume of the six-piece wide-angle lens group and increasing the area of the imaging surface.

Description of drawings

FIG. 1A is a schematic diagram of a six-piece wide-angle lens group according to the first embodiment of the present invention.

FIG. 1B is a graph of field curvature and distortion aberration curves of the six-piece wide-angle lens group of the first embodiment from left to right.

2A is a schematic diagram of a six-piece wide-angle lens group according to a second embodiment of the present invention.

FIG. 2B is a curve diagram of field curvature and distortion aberration of the six-piece wide-angle lens group of the second embodiment from left to right.

3A is a schematic diagram of a six-piece wide-angle lens group according to a third embodiment of the present invention.

FIG. 3B is a graph of field curvature and distortion aberration of the six-piece wide-angle lens group of the first embodiment from left to right.

4A is a schematic diagram of a six-piece wide-angle lens group according to a fourth embodiment of the present invention.

FIG. 4B is a graph of field curvature and distortion aberration of the six-piece wide-angle lens group of the fourth embodiment from left to right.

5A is a schematic diagram of a six-piece wide-angle lens group according to a fifth embodiment of the present invention.

FIG. 5B is a curve diagram of field curvature and distortion aberration of the six-piece wide-angle lens group of the fifth embodiment from left to right.

6A is a schematic diagram of a six-piece wide-angle lens group according to a sixth embodiment of the present invention.

FIG. 6B is a curve diagram of field curvature and distortion aberration of the six-piece wide-angle lens group of the sixth embodiment from left to right.

7A is a schematic diagram of a six-piece wide-angle lens group according to a seventh embodiment of the present invention.

FIG. 7B is a graph of field curvature and distortion aberration curves of the six-piece wide-angle lens group of the seventh embodiment from left to right.

8A is a schematic diagram of a six-piece wide-angle lens group according to an eighth embodiment of the present invention.

FIG. 8B is a graph of field curvature and distortion aberration of the six-piece wide-angle lens group of the eighth embodiment from left to right.

9A is a schematic diagram of a six-piece wide-angle lens group according to a ninth embodiment of the present invention.

FIG. 9B is a graph of field curvature and distortion aberration of the six-piece wide-angle lens group of the ninth embodiment from left to right.

10A is a schematic diagram of a six-piece wide-angle lens group according to a tenth embodiment of the present invention.

FIG. 10B is a graph of field curvature and distortion aberration curves of the six-piece wide-angle lens group of the tenth embodiment from left to right.

11A is a schematic diagram of a six-piece wide-angle lens group according to an eleventh embodiment of the present invention.

FIG. 11B is a graph of field curvature and distortion aberration of the six-piece wide-angle lens group of the eleventh embodiment from left to right.

Description of symbols in the attached drawings:

100, 200, 300, 400, 500, 600, 700, 800, 900, 1000, 1100: Aperture

110, 210, 310, 410, 510, 610, 710, 810, 910, 1010, 1110: the first lens

111, 211, 311, 411, 511, 611, 711, 811, 911, 1011, 1111: Object side surface

112, 212, 312, 412, 512, 612, 712, 812, 912, 1012, 1112: Image side surface

120, 220, 320, 420, 520, 620, 720, 820, 920, 1020, 1120: Second lens

121, 221, 321, 421, 521, 621, 721, 821, 921, 1021, 1121: Object side surface

122, 222, 322, 422, 522, 622, 722, 822, 922, 1022, 1122: Image side surface

130, 230, 330, 430, 530, 630, 730, 830, 930, 1030, 1130: Third lens

131, 231, 331, 431, 531, 631, 731, 831, 931, 1031, 1131: Object side surface

132, 232, 332, 432, 532, 632, 732, 832, 932, 1032, 1132: Image side surface

140, 240, 340, 440, 540, 640, 740, 840, 940, 1040, 1140: Fourth lens

141, 241, 341, 441, 541, 641, 741, 841, 941, 1041, 1141: Object side surface

142, 242, 342, 442, 542, 642, 742, 842, 942, 1042, 1142: Image side surface

150, 250, 350, 450, 550, 650, 750, 850, 950, 1050, 1150: Fifth lens

151, 251, 351, 451, 551, 651, 751, 851, 951, 1051, 1151: Object side surface

152, 252, 352, 452, 552, 652, 752, 852, 952, 1052, 1152: Image side surface

160, 260, 360, 460, 560, 660, 760, 860, 960, 1060, 1160: sixth lens

161, 261, 361, 461, 561, 661, 761, 861, 961, 1061, 1161: Object side surface

162, 262, 362, 462, 562, 662, 762, 862, 962, 1062, 1162: Image side surface

170, 270, 370, 470, 570, 670, 770, 870, 970, 1070, 1170: Infrared filter components

180, 280, 380, 480, 580, 680, 780, 880, 980, 1080, 1180: Imaging plane

190, 290, 390, 490, 590, 690, 790, 890, 990, 1090, 1190: Optical axis

f: The focal length of the six-element wide-angle lens group

Fno: The aperture value of the six-piece wide-angle lens group

FOV: The largest field of view in the six-piece wide-angle lens group

f3: The focal length of the third lens

f6: The focal length of the sixth lens

f45: Composite focal length of the fourth lens and the fifth lens

f23456: Composite focal length of the second lens, third lens, fourth lens, fifth lens and sixth lens

CT1: Thickness of the first lens on the optical axis

CT3: Thickness of the third lens on the optical axis

CT4: Thickness of the fourth lens on the optical axis

CT5: Thickness of the fifth lens on the optical axis

CT6: Thickness of the sixth lens on the optical axis

IMH: Half of the imaging height that can be captured by the six-piece wide-angle lens group on the imaging surface

BFL: The distance from the image side surface of the sixth lens to the imaging surface on the optical axis

CTSI: the distance from the aperture to the imaging plane on the optical axis

Detailed ways

The technical solutions of the present invention will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

first embodiment

As shown in FIG. 1A and FIG. 1B , FIG. 1A is a schematic diagram of a six-piece wide-angle lens set according to the first embodiment of the present invention, and FIG. 1B is the six-piece wide-angle lens of the first embodiment from left to right. The image plane curvature and distortion curve of the group. As can be seen from FIG. 1A , the six-piece wide-angle lens group includes an aperture 100 and an optical group, and the optical group includes a first lens 110 , a second lens 120 , a third lens 130 , and a fourth lens in sequence from the object side to the image side 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 wide-angle lens group. The aperture 100 is disposed between the first lens 110 and the second lens 120 .

The first lens 110 has a negative refractive power and is made of plastic material. The object-side surface 111 is concave at the near-optical axis 190, the image-side surface 112 is concave at the near-optical axis 190, and the object-side surface 111 and the image-side surface 112 are concave. All are aspherical.

The second lens 120 has a positive refractive power and is made of plastic material. The object-side surface 121 is convex at the near-optical axis 190 , the image-side surface 122 is convex at the near-optical axis 190 , and the object-side surface 121 and the image-side surface 122 are convex. All are aspherical.

The third lens 130 has a negative refractive power and is made of plastic material. The object-side surface 131 is convex at the near-optical axis 190, the image-side surface 132 is concave at the near-optical axis 190, and the object-side surface 131 and the image-side surface 132 are concave. All are aspherical.

The fourth lens 140 has a positive refractive power and is made of plastic material. The object-side surface 141 is convex at the near-optical axis 190, the image-side surface 142 is concave at the near-optical axis 190, and the object-side surface 141 and the image-side surface 142 are concave. All are aspherical.

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

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

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

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

Where z is the position value along the optical axis 190 at the height h with the surface vertex as a reference; 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 of the lens surface from the optical axis 190, k is the conic constant, and A, B, C, D, E, F, ... are Higher order aspheric coefficients.

In the six-piece wide-angle lens group of the first embodiment, the focal length of the six-piece wide-angle lens group is f, the aperture value (f-number) of the six-piece wide-angle lens group is Fno, and the maximum viewing angle of the six-piece wide-angle lens group is Fno. The field angle (picture angle) is FOV, and its values are as follows: f=1.38 (millimeters); Fno=2.07; and FOV=140.09 (degrees).

In the six-piece wide-angle lens set of the first embodiment, the thickness of the first lens 110 on the optical axis 190 is CT1, the thickness of the third lens 130 on the optical axis 190 is CT3, and the thickness of the fourth lens 140 on the optical axis 190 The thickness is CT4, the thickness of the fifth lens 150 on the optical axis 190 is CT5, the thickness of the sixth lens 160 on the optical axis 190 is CT6, and the following conditions are met: (CT4+CT5)/(CT1+CT3+CT6 )=1.353; (CT1+CT6)/CT3=2.727.

In the six-piece wide-angle lens group of the first embodiment, the overall focal length of the six-piece wide-angle lens group is f, the composite focal length of the fourth lens 140 and the fifth lens 150 is f45, and the following conditions are met: f/f45 =0.805.

In the six-piece wide-angle lens set of the first embodiment, the combined focal length of the second lens 120, the third lens 130, the fourth lens 140, the fifth lens 150 and the sixth lens 160 is f23456, and the six-piece wide-angle lens The overall focal length of the group is f and satisfies the following conditions: f/f23456=0.841.

In the six-piece wide-angle lens group of the first embodiment, the focal length of the third lens 130 is f3, the combined focal length of the fourth lens 140 and the fifth lens 150 is f45, and the following conditions are satisfied: f3/f45=-2.510.

In the six-piece wide-angle lens group of the first embodiment, the composite 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 satisfied: f6/f45=-1.590.

In the six-piece wide-angle lens group of the first embodiment, the thickness of the fourth lens 140 on the optical axis 190 is CT4, the thickness of the fifth lens 150 on the optical axis 190 is CT5, and the thickness of the third lens 130 on the optical axis 190 The thickness is CT3 and meets the following conditions: (CT4+CT5)/CT3=5.042.

In the six-piece wide-angle lens group of the first embodiment, the thickness of the second lens 120 on the optical axis 190 is CT2, the thickness of the third lens 130 on the optical axis 190 is CT3, and the following conditions are met: CT2/CT3= 3.397.

In the six-piece wide-angle lens group of the first embodiment, the thickness of the sixth lens 160 on the optical axis 190 is CT6, the thickness of the third lens 130 on the optical axis 190 is CT3, and the following conditions are met: CT6/CT3= 1.401.

In the six-piece wide-angle lens group of the first embodiment, the thickness of the fourth lens 140 on the optical axis 190 is CT4, the thickness of the fifth lens 150 on the optical axis 190 is CT5, and the thickness of the first lens 110 on the optical axis 190 The thickness is CT1 and satisfies the following conditions: (CT4+CT5)/CT1=3.804.

In the six-piece wide-angle lens set of the first embodiment, the combined focal length of the second lens 120, the third lens 130, the fourth lens 140, the fifth lens 150 and the sixth lens 160 is f23456, and the six-piece wide-angle lens Half of the imaging height that the slice group can capture on the imaging plane is IMH, and the following conditions are met: IMH/f23456=1.381.

In the six-piece wide-angle lens group of the first embodiment, the overall focal length of the six-piece wide-angle lens group is f, and half of the imaging height that the six-piece wide-angle lens group can capture on the imaging plane 180 is IMH, And the following conditions are met: IMH/f=1.642.

In the six-piece wide-angle lens group of the first embodiment, the distance from the image-side surface 162 of the sixth lens 160 to the imaging surface 180 on the optical axis 190 is BFL, and the overall focal length of the six-piece wide-angle lens group is f, And the following conditions are met: f/BFL=1.221.

In the six-piece wide-angle lens group of the first embodiment, half of the imaging height that the six-piece wide-angle lens group can capture on the imaging plane 180 is IMH, and the distance from the aperture 100 to the imaging plane 180 on the optical axis 190 is CTSI, and satisfy the following conditions: CTSI/(IMH*2)=0.961.

Refer to Table 1 and Table 2 below for further cooperation.

Table 1 is the detailed structural data of the first embodiment of FIG. 1A, wherein the unit of curvature radius, thickness and focal length is mm, and surfaces 0-18 represent the surface from the object side to the image side in sequence, and also include the test surface ( That is, the surface 1) and the light-shielding surface (that is, the surface 7) for allowing part of the light to pass through and part of the light-shielding part. Table 2 shows the aspheric surface data in the first embodiment, wherein k represents the cone 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 tables of the embodiments are schematic diagrams and graphs of image plane curvature and distorted absorption difference corresponding to each embodiment. The definitions of the data in the tables are the same as those in Table 1 and Table 2 of the first embodiment, and are not omitted here. Add elaboration.

Second Embodiment

As shown in FIGS. 2A and 2B , wherein FIG. 2A is a schematic diagram of a six-piece wide-angle lens set according to the second embodiment of the present invention, and FIG. 2B is the six-piece wide-angle lens set in sequence from left to right. The image plane curvature and distortion curve of the group. As can be seen from FIG. 2A , the six-piece wide-angle lens group includes an aperture 200 and an optical group, and the optical group includes a first lens 210 , a second lens 220 , a third lens 230 , and a fourth lens in sequence from the object side to the image side 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 wide-angle lens group. The aperture 200 is disposed between the first lens 210 and the second lens 220 .

The first lens 210 has a negative refractive power and is made of plastic material. The object-side surface 211 is concave at the near-optical axis 290, the image-side surface 212 is concave at the near-optical axis 290, and the object-side surface 211 and the image-side surface 212 are concave. All are aspherical.

The second lens 220 has a positive refractive power and is made of plastic material. The object-side surface 221 is convex at the near-optical axis 290 , the image-side surface 222 is convex at the near-optical axis 290 , and the object-side surface 221 and the image-side surface 222 are convex. All are aspherical.

The third lens 230 has negative refractive power and is made of plastic material. The object-side surface 231 is convex at the near-optical axis 290 , the image-side surface 232 is concave at the near-optical axis 290 , and the object-side surface 231 and the image-side surface 232 are concave. All are aspherical.

The fourth lens 240 has a positive refractive power and is made of plastic material. The object-side surface 241 is convex at the near-optical axis 290, the image-side surface 242 is concave at the near-optical axis 290, and the object-side surface 241 and the image-side surface 242 are concave. All are aspherical.

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

The sixth lens 260 has a negative refractive power and is made of plastic material. The object-side surface 261 is convex at the near-optical axis 290, the image-side surface 262 is concave at the near-optical axis 290, and the object-side surface 261 and the image-side surface 262 are concave. Both are aspherical, and both the object-side surface 261 and the image-side surface 262 have at least one inflection point.

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

For further cooperation, refer to Table 3 and Table 4 below.

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

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

Third Embodiment

As shown in FIGS. 3A and 3B , wherein FIG. 3A is a schematic diagram of a six-piece wide-angle lens group according to a third embodiment of the present invention, and FIG. 3B is a six-piece wide-angle lens set of the third embodiment in sequence from left to right The image plane curvature and distortion curve of the group. As can be seen from FIG. 3A , the six-piece wide-angle lens group includes an aperture 300 and an optical group, and the optical group 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. 340 , the fifth lens 350 , the sixth lens 360 , and the imaging surface 380 , wherein there are six lenses with refractive power in the six-piece wide-angle lens group. The aperture 300 is disposed between the first lens 310 and the second lens 320 .

The first lens 310 has a negative refractive power and is made of plastic material. The object-side surface 311 is concave at the near-optical axis 390, the image-side surface 312 is concave at the near-optical axis 390, and the object-side surface 311 and the image-side surface 312 are concave. All are aspherical.

The second lens 320 has a positive refractive power and is made of plastic material. The object-side surface 321 is convex at the near-optical axis 390 , the image-side surface 322 is convex at the near-optical axis 390 , and the object-side surface 321 and the image-side surface 322 are convex. All are aspherical.

The third lens 330 has a negative refractive power and is made of plastic material. The object-side surface 331 is convex at the near-optical axis 390, the image-side surface 332 is concave at the near-optical axis 390, and the object-side surface 331 and the image-side surface 332 are concave. All are aspherical.

The fourth lens 340 has a positive refractive power and is made of plastic material. The object-side surface 341 is convex at the near-optical axis 390, the image-side surface 342 is concave at the near-optical axis 390, and the object-side surface 341 and the image-side surface 342 are concave. All are aspherical.

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

The sixth lens 360 has a negative refractive power and is made of plastic material. The object-side surface 361 is convex at the near-optical axis 390, the image-side surface 362 is concave at the near-optical axis 390, and the object-side surface 361 and the image-side surface 362 are concave. Both are aspherical, and both the object-side surface 361 and the image-side surface 362 have more than one inflection point.

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

For further cooperation, refer to Table 5 and Table 6 below.

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

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

Fourth Embodiment

As shown in FIG. 4A and FIG. 4B , FIG. 4A is a schematic diagram of a six-piece wide-angle lens set according to a fourth embodiment of the present invention, and FIG. 4B is a six-piece wide-angle lens in sequence from left to right. The image plane curvature and distortion curve of the group. As can be seen from FIG. 4A , the six-piece wide-angle lens group includes an aperture 400 and an optical group, and the optical group includes a first lens 410 , a second lens 420 , a third lens 430 , and a fourth lens in sequence from the object side to the image side 440 , the fifth lens 450 , the sixth lens 460 , and the imaging surface 480 , wherein there are six lenses with refractive power in the six-piece wide-angle lens group. The aperture 400 is disposed between the first lens 410 and the second lens 420 .

The first lens 410 has a negative refractive power and is made of plastic material. The object-side surface 411 is concave at the near-optical axis 490, the image-side surface 412 is concave at the near-optical axis 490, and the object-side surface 411 and the image-side surface 412 are concave. All are aspherical.

The second lens 420 has a positive refractive power and is made of plastic material. The object-side surface 421 is convex near the optical axis 490 , the image-side surface 422 is convex near the optical axis 490 , and the object-side surface 421 and the image-side surface 422 are convex. All are aspherical.

The third lens 430 has a negative refractive power and is made of plastic material. The object-side surface 431 is convex at the near-optical axis 490, the image-side surface 432 is concave at the near-optical axis 490, and the object-side surface 431 and the image-side surface 432 are concave. All are aspherical.

The fourth lens 440 has a positive refractive power and is made of plastic material. The object-side surface 441 is convex at the near-optical axis 490, the image-side surface 442 is concave at the near-optical axis 490, and the object-side surface 441 and the image-side surface 442 are concave. All are aspherical.

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

The sixth lens 460 has a negative refractive power and is made of plastic material. The object-side surface 461 is convex at the near-optical axis 490, the image-side surface 462 is concave at the near-optical axis 490, and the object-side surface 461 and the image-side surface 462 are concave. Both are aspherical, and both the object-side surface 461 and the image-side surface 462 have more than one inflection point.

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

Refer to Table 7 and Table 8 below for further cooperation.

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 are not repeated here.

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

Fifth Embodiment

As shown in FIGS. 5A and 5B , wherein FIG. 5A is a schematic diagram of a six-piece wide-angle lens set according to a fifth embodiment of the present invention, and FIG. 5B is a six-piece wide-angle lens set in sequence from left to right in the fifth embodiment The image plane curvature and distortion curve of the group. As can be seen from FIG. 5A , the six-piece wide-angle lens group includes an aperture 500 and an optical group, and the optical group includes a first lens 510 , a second lens 520 , a third lens 530 , and a fourth lens in sequence from the object side to the image side. 540 , the fifth lens 550 , the sixth lens 560 , and the imaging surface 580 , wherein there are six lenses with refractive power in the six-piece wide-angle lens group. The aperture 500 is disposed between the first lens 510 and the second lens 520 .

The first lens 510 has a negative refractive power and is made of plastic material. The object-side surface 511 is concave at the near-optical axis 590, the image-side surface 512 is concave at the near-optical axis 590, and the object-side surface 511 and the image-side surface 512 are concave. All are aspherical.

The second lens 520 has a positive refractive power and is made of plastic material. The object-side surface 521 is convex near the optical axis 590 , the image-side surface 522 is convex near the optical axis 590 , and the object-side surface 521 and the image-side surface 522 are convex. All are aspherical.

The third lens 530 has a negative refractive power and is made of plastic material. The object-side surface 531 is convex at the near-optical axis 590, the image-side surface 532 is concave at the near-optical axis 590, and the object-side surface 531 and the image-side surface 532 are concave. All are aspherical.

The fourth lens element 540 has a positive refractive power and is made of plastic material. The object-side surface 541 is convex at the near-optical axis 590, the image-side surface 542 is concave at the near-optical axis 590, and the object-side surface 541 and the image-side surface 542 are concave. All are aspherical.

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

The sixth lens 560 has a negative refractive power and is made of plastic material. The object-side surface 561 is convex at the near-optical axis 590, the image-side surface 562 is concave at the near-optical axis 590, and the object-side surface 561 and the image-side surface 562 are concave. Both are aspherical, and both the object-side surface 561 and the image-side surface 562 have more than one inflection point.

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

Please refer to Table 9 and Table 10 below for further reference.

In the fifth 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 are not repeated here.

According to Table 9 and Table 10, the following data can be calculated:

Sixth Embodiment

As shown in FIGS. 6A and 6B , wherein FIG. 6A is a schematic diagram of a six-piece wide-angle lens set according to a sixth embodiment of the present invention, and FIG. 6B is a six-piece wide-angle lens from left to right in sequence. The image plane curvature and distortion curve of the group. As can be seen from FIG. 6A , the six-piece wide-angle lens group includes an aperture 600 and an optical group, and the optical group includes a first lens 610 , a second lens 620 , a third lens 630 , and a fourth lens in sequence from the object side to the image side 640 , the fifth lens 650 , the sixth lens 660 , and the imaging surface 680 , wherein there are six lenses with refractive power in the six-piece wide-angle lens group. The aperture 600 is disposed between the first lens 610 and the second lens 620 .

The first lens 610 has a negative refractive power and is made of plastic material. The object-side surface 611 is concave at the near-optical axis 690, the image-side surface 612 is concave at the near-optical axis 690, and the object-side surface 611 and the image-side surface 612 are concave. All are aspherical.

The second lens 620 has a positive refractive power and is made of plastic material. The object-side surface 621 is convex near the optical axis 690 , the image-side surface 622 is convex near the optical axis 690 , and the object-side surface 621 and the image-side surface 622 are convex. All are aspherical.

The third lens 630 has a negative refractive power and is made of plastic material. The object-side surface 631 is convex at the near-optical axis 690, the image-side surface 632 is concave at the near-optical axis 690, and the object-side surface 631 and the image-side surface 632 are concave. All are aspherical.

The fourth lens 640 has a positive refractive power and is made of plastic material. The object-side surface 641 is convex at the near-optical axis 690, the image-side surface 642 is concave at the near-optical axis 690, and the object-side surface 641 and the image-side surface 642 are concave. All are aspherical.

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

The sixth lens element 660 has a negative refractive power and is made of plastic material. The object-side surface 661 is convex at the near-optical axis 690, the image-side surface 662 is concave at the near-optical axis 690, and the object-side surface 661 and the image-side surface 662 are concave. Both are aspherical, and both the object-side surface 661 and the image-side surface 662 have more than one inflection point.

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

For further cooperation, refer to Table 11 and Table 12 below.

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 are not repeated here.

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

Seventh Embodiment

As shown in FIGS. 7A and 7B , wherein FIG. 7A is a schematic diagram of a six-piece wide-angle lens group according to a seventh embodiment of the present invention, and FIG. 7B is a six-piece wide-angle lens set in sequence from left to right in the seventh embodiment The image plane curvature and distortion curve of the group. As can be seen from FIG. 7A , the six-piece wide-angle lens group includes an aperture 700 and an optical group, and the optical group includes a first lens 710 , a second lens 720 , a third lens 730 , and a fourth lens in sequence from the object side to the image side 740 , the fifth lens 750 , the sixth lens 760 , and the imaging surface 780 , wherein there are six lenses with refractive power in the six-piece wide-angle lens group. The aperture 700 is disposed between the first lens 710 and the second lens 720 .

The first lens 710 has a negative refractive power and is made of plastic material. The object-side surface 711 is concave at the near-optical axis 790, the image-side surface 712 is concave at the near-optical axis 790, and the object-side surface 711 and the image-side surface 712 are concave. All are aspherical.

The second lens 720 has a positive refractive power and is made of plastic material. The object-side surface 721 is convex at the near-optical axis 790 , the image-side surface 722 is convex at the near-optical axis 790 , and the object-side surface 721 and the image-side surface 722 are convex. All are aspherical.

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

The fourth lens 740 has a positive refractive power and is made of plastic material. The object-side surface 741 is convex at the near-optical axis 790, the image-side surface 742 is concave at the near-optical axis 790, and the object-side surface 741 and the image-side surface 742 are concave. All are aspherical.

The fifth lens 750 has a positive refractive power and is made of plastic material. The object-side surface 751 is convex at the near-optical axis 790, the image-side surface 752 is convex at the near-optical axis 790, and the object-side surface 751 and the image-side surface 752 are convex. All are aspherical, and the object-side surface 751 has at least one inflection point.

The sixth lens 760 has a negative refractive power and is made of plastic material. The object-side surface 761 is convex at the near-optical axis 790, the image-side surface 762 is concave at the near-optical axis 790, and the object-side surface 761 and the image-side surface 762 are concave. Both are aspherical, and both the object-side surface 761 and the image-side surface 762 have more than one inflection point.

The infrared filter element 770 is made of glass, and is disposed between the sixth lens 760 and the imaging surface 780 and does not affect the focal length of the six-piece wide-angle lens group.

For further cooperation, refer to Table 13 and Table 14 below.

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 are not repeated here.

According to Table 13 and Table 14, the following data can be calculated:

Eighth Embodiment

As shown in FIGS. 8A and 8B , wherein FIG. 8A is a schematic diagram of a six-piece wide-angle lens set according to an eighth embodiment of the present invention, and FIG. 8B is the six-piece wide-angle lens of the eighth embodiment from left to right. The image plane curvature and distortion curve of the group. As can be seen from FIG. 8A , the six-piece wide-angle lens group includes an aperture 800 and an optical group, and the optical group sequentially includes a first lens 810 , a second lens 820 , a third lens 830 , and a first lens 810 from the object side to the image side. The four lenses 840, the fifth lens 850, the sixth lens 860, and the imaging surface 880, wherein the six lenses with refractive power in the six-piece wide-angle lens group are six. The aperture 800 is disposed between the first lens 810 and the second lens 820 .

The first lens 810 has a negative refractive power and is made of plastic material. The object-side surface 811 is concave at the near-optical axis 890, the image-side surface 812 is concave at the near-optical axis 890, and the object-side surface 811 and the image-side surface 812 are concave. All are aspherical.

The second lens 820 has a positive refractive power and is made of plastic material. The object-side surface 821 is convex at the near-optical axis 890, the image-side surface 822 is convex at the near-optical axis 890, and the object-side surface 821 and the image-side surface 822 are convex. All are aspherical.

The third lens 830 has negative refractive power and is made of plastic material. The object-side surface 831 is convex at the near-optical axis 890, the image-side surface 832 is concave at the near-optical axis 890, and the object-side surface 831 and the image-side surface 832 are concave. All are aspherical.

The fourth lens 840 has a positive refractive power and is made of plastic material. The object-side surface 841 is convex at the near-optical axis 890, the image-side surface 842 is concave at the near-optical axis 890, and the object-side surface 841 and the image-side surface 842 are concave. All are aspherical.

The fifth lens element 850 has a positive refractive power and is made of plastic material. The object-side surface 851 is convex at the near-optical axis 890, the image-side surface 852 is convex at the near-optical axis 890, and the object-side surface 851 and the image-side surface 852 are convex. All are aspherical, and the object-side surface 851 has at least one inflection point.

The sixth lens 860 has a negative refractive power and is made of plastic material. The object-side surface 861 is convex at the near-optical axis 890, the image-side surface 862 is concave at the near-optical axis 890, and the object-side surface 861 and the image-side surface 862 are concave. Both are aspherical, and both the object-side surface 861 and the image-side surface 862 have more than one inflection point.

The infrared filter element 870 is made of glass, and is disposed between the sixth lens 860 and the imaging surface 880 and does not affect the focal length of the six-piece wide-angle lens group.

For further cooperation, refer to Table 15 and Table 16 below.

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

According to Table 15 and Table 16, the following data can be calculated:

Ninth Embodiment

As shown in FIGS. 9A and 9B , wherein FIG. 9A is a schematic diagram of a six-piece wide-angle lens group according to a ninth embodiment of the present invention, and FIG. 9B is a six-piece wide-angle lens set in sequence from left to right in the ninth embodiment. The image plane curvature and distortion curve of the group. As can be seen from FIG. 9A , the six-piece wide-angle lens group includes an aperture 900 and an optical group, and the optical group includes a first lens 910 , a second lens 920 , a third lens 930 , and a fourth lens in sequence from the object side to the image side 940 , the fifth lens 950 , the sixth lens 960 , and the imaging surface 980 , wherein there are six lenses with refractive power in the six-piece wide-angle lens group. The aperture 900 is disposed between the first lens 910 and the second lens 920 .

The first lens 910 has a negative refractive power and is made of plastic material. The object-side surface 911 is concave at the near-optical axis 990, the image-side surface 912 is concave at the near-optical axis 990, and the object-side surface 911 and the image-side surface 912 are concave. All are aspherical.

The second lens 920 has a positive refractive power and is made of plastic material. The object-side surface 921 is convex near the optical axis 990 , the image-side surface 922 is convex near the optical axis 990 , and the object-side surface 921 and the image-side surface 922 are convex. All are aspherical.

The third lens 930 has a negative refractive power and is made of plastic material. The object-side surface 931 is convex at the near-optical axis 990, the image-side surface 932 is concave at the near-optical axis 990, and the object-side surface 931 and the image-side surface 932 are concave. All are aspherical.

The fourth lens 940 has a positive refractive power and is made of plastic material. The object-side surface 941 is convex at the near-optical axis 990, the image-side surface 942 is concave at the near-optical axis 990, and the object-side surface 941 and the image-side surface 942 are concave. All are aspherical.

The fifth lens 950 has a positive refractive power and is made of plastic material. The object-side surface 951 is convex at the near-optical axis 990, the image-side surface 952 is convex at the near-optical axis 990, and the object-side surface 951 and the image-side surface 952 are convex. All are aspherical, and the object-side surface 951 has at least one inflection point.

The sixth lens element 960 has a negative refractive power and is made of plastic material. The object-side surface 961 is convex at the near-optical axis 990, the image-side surface 962 is concave at the near-optical axis 990, and the object-side surface 961 and the image-side surface 962 are concave. Both are aspherical, and both the object-side surface 961 and the image-side surface 962 have more than one inflection point.

The infrared filter element 970 is made of glass, and is disposed between the sixth lens 960 and the imaging surface 980 and does not affect the focal length of the six-piece wide-angle lens group.

For further cooperation, refer to Table 17 and Table 18 below.

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

According to Table 17 and Table 18, the following data can be calculated:

Tenth Embodiment

As shown in FIGS. 10A and 10B , wherein FIG. 10A is a schematic diagram of a six-piece wide-angle lens set according to a tenth embodiment of the present invention, and FIG. 10B is a six-piece wide-angle lens of the tenth embodiment from left to right. The image plane curvature and distortion curve of the group. As can be seen from FIG. 10A , the six-piece wide-angle lens group includes an aperture 1000 and an optical group, and the optical group sequentially includes a first lens 1010 , a second lens 1020 , a third lens 1030 , and a fourth lens from the object side to the image side 1040 , the fifth lens 1050 , the sixth lens 1060 , and the imaging surface 1080 , wherein there are six lenses with refractive power in the six-piece wide-angle lens group. The aperture 1000 is disposed between the first lens 1010 and the second lens 1020 .

The first lens 1010 has a negative refractive power and is made of plastic material. The object-side surface 1011 is concave at the near-optical axis 1090, the image-side surface 1012 is concave at the near-optical axis 1090, and the object-side surface 1011 and the image-side surface 1012 are concave. All are aspherical.

The second lens 1020 has a positive refractive power and is made of plastic material. The object-side surface 1021 is convex at the near-optical axis 1090, the image-side surface 1022 is convex at the near-optical axis 1090, and the object-side surface 1021 and the image-side surface 1022 are convex. All are aspherical.

The third lens 1030 has a negative refractive power and is made of plastic material. The object-side surface 1031 is convex at the near-optical axis 1090, the image-side surface 1032 is concave at the near-optical axis 1090, and the object-side surface 1031 and the image-side surface 1032 are concave. All are aspherical.

The fourth lens 1040 has a positive refractive power and is made of plastic material. The object-side surface 1041 is convex at the near-optical axis 1090, the image-side surface 1042 is concave at the near-optical axis 1090, and the object-side surface 1041 and the image-side surface 1042 are concave. All are aspherical.

The fifth lens 1050 has a positive refractive power and is made of plastic material. The object-side surface 1051 is convex at the near-optical axis 1090, the image-side surface 1052 is convex at the near-optical axis 1090, and the object-side surface 1051 and the image-side surface 1052 are convex. All are aspherical, and the object-side surface 1051 has at least one inflection point.

The sixth lens 1060 has a negative refractive power and is made of plastic material. The object-side surface 1061 is convex at the near-optical axis 1090, the image-side surface 1062 is concave at the near-optical axis 1090, and the object-side surface 1061 and the image-side surface 1062 are concave. Both are aspherical, and both the object-side surface 1061 and the image-side surface 1062 have more than one inflection point.

The infrared filter element 1070 is made of glass, and is disposed between the sixth lens 1060 and the imaging surface 1080 and does not affect the focal length of the six-piece wide-angle lens group.

For further cooperation, refer to Table 19 and Table 20 below.

In the tenth 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 are not repeated here.

With Table 19 and Table 20, the following data can be calculated:

Eleventh Embodiment

As shown in FIGS. 11A and 11B , wherein FIG. 11A is a schematic diagram of a six-piece wide-angle lens set according to an eleventh embodiment of the present invention, and FIG. 11B is the six-piece wide-angle lens set of the eleventh embodiment in sequence from left to right. Image surface curvature and distortion curve of wide-angle lens group. As can be seen from FIG. 11A , the six-piece wide-angle lens group includes an aperture 1100 and an optical group, and the optical group sequentially includes a first lens 1110 , a second lens 1120 , a third lens 1130 , and a fourth lens from the object side to the image side 1140 , the fifth lens 1150 , the sixth lens 1160 , and the imaging surface 1180 , wherein there are six lenses with refractive power in the six-piece wide-angle lens group. The aperture 1100 is disposed between the first lens 1110 and the second lens 1120 .

The first lens 1110 has a negative refractive power and is made of plastic material. The object-side surface 1111 is concave at the near-optical axis 1190, the image-side surface 1112 is concave at the near-optical axis 1190, and the object-side surface 1111 and the image-side surface 1112 are concave. All are aspherical.

The second lens 1120 has a positive refractive power and is made of plastic material. The object-side surface 1121 is convex at the near-optical axis 1190, the image-side surface 1122 is convex at the near-optical axis 1190, and the object-side surface 1121 and the image-side surface 1122 are convex. All are aspherical.

The third lens 1130 has a negative refractive power and is made of plastic material. The object-side surface 1131 is convex at the near-optical axis 1190, the image-side surface 1132 is concave at the near-optical axis 1190, and the object-side surface 1131 and the image-side surface 1132 are concave. All are aspherical.

The fourth lens 1140 has a positive refractive power and is made of plastic material. The object-side surface 1141 is convex at the near-optical axis 1190, the image-side surface 1142 is concave at the near-optical axis 1190, and the object-side surface 1141 and the image-side surface 1142 are concave. All are aspherical.

The fifth lens 1150 has a positive refractive power and is made of plastic material. The object-side surface 1151 is convex at the near-optical axis 1190, the image-side surface 1152 is convex at the near-optical axis 1190, and the object-side surface 1151 and the image-side surface 1152 are convex. All are aspherical, and the object-side surface 1151 has at least one inflection point.

The sixth lens 1160 has a negative refractive power and is made of plastic material. The object-side surface 1161 is convex at the near-optical axis 1190, the image-side surface 1162 is concave at the near-optical axis 1190, and the object-side surface 1161 and the image-side surface 1162 are concave. Both are aspherical, and both the object-side surface 1161 and the image-side surface 1162 have more than one inflection point.

The infrared filter element 1170 is made of glass, and is disposed between the sixth lens 1160 and the imaging surface 1180 and does not affect the focal length of the six-piece wide-angle lens group.

For further cooperation, refer to Table 21 and Table 22 below.

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

According to Table 21 and Table 22, the following data can be calculated:

In the six-piece wide-angle lens set provided by the present invention, the material of the lens can be plastic or glass. When the lens is made of plastic, the production cost can be effectively reduced, and when the lens is made of glass, the refractive index of the six-piece wide-angle lens set can be increased. degrees of freedom for force configuration. In addition, the object-side surface and the image-side surface of the lens in the six-piece wide-angle lens group can be aspherical. Therefore, the total length of the six-piece wide-angle lens group of the present invention can be effectively reduced.

In the six-piece wide-angle lens set provided by the present invention, for a lens with refractive power, if the surface of the lens is convex and the position of the convex surface is not defined, it means that the surface of the lens is convex at the near optical axis ; If 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 wide-angle lens set provided by the present invention can be applied to the optical system of moving focusing 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, In electronic imaging systems such as digital cameras, mobile devices, digital drawing boards, or car photography.

To sum up, the above-mentioned embodiments are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, Improvements and the like should all be included within the protection scope of the present invention.

Claims (12)

1. A six-piece wide-angle lens group is characterized in that, comprising an aperture and an optical group made up of six lenses, from the object side to the image side in sequence: The first lens has a negative refractive power, the object-side surface of the first lens is concave at the near-optical axis, the image-side surface of the first lens is concave at the near-optical axis, and the object-side surface of the first lens is concave At least one surface with the image side surface is aspherical; the aperture; The second lens has a positive refractive power, the object-side surface of the second lens is convex at the near-optical axis, the image-side surface of the second lens is convex at the near-optical axis, and the object-side surface of the second lens is convex At least one surface with the image side surface is aspherical; The third lens has a negative refractive power, the object-side surface of the third lens is convex at the near-optical axis, the image-side surface of the third lens is concave at the near-optical axis, and the object-side surface of the third lens At least one surface with the image side surface is aspherical; The fourth lens has a positive refractive power, the object-side surface of the fourth lens is convex at the near-optical axis, the image-side surface of the fourth lens is concave at the near-optical axis, and the object-side surface of the fourth lens At least one surface with the image side surface is aspherical; The fifth lens has a positive refractive power, the object-side surface of the fifth lens is convex at the near-optical axis, the image-side surface of the fifth lens is convex at the near-optical axis, and the object-side surface of the fifth lens is convex At least one surface of the image-side surface and the image-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; and The sixth lens has a negative refractive power, the object-side surface of the sixth lens is convex at the near-optical axis, the image-side surface of the sixth lens is concave at the near-optical axis, and the object-side surface of the sixth lens At least one surface of the image-side surface and the image-side surface is aspherical, and at least one of the object-side surface and the image-side surface of the sixth lens has at least one inflection point; The thickness of the first lens on the optical axis is CT1, the thickness of the third lens on the optical axis is CT3, the thickness of the fourth lens on the optical axis is CT4, and the thickness of the fifth lens on the optical axis is CT4. The thickness on the axis is CT5, the thickness of the sixth lens on the optical axis is CT6, the half of the imaging height that the six-piece wide-angle lens group can capture on the imaging plane is IMH, and the aperture to the imaging plane is at The distance on the optical axis is CTSI and satisfies the following conditions: 0.82<(CT4+CT5)/(CT1+CT3+CT6)<1.96, 2.07<(CT1+CT6)/CT3<5.52, and 0.92≦CTSI/(IMH*2)<1.2. 2. The six-piece wide-angle lens group according to claim 1, wherein the overall focal length of the six-piece wide-angle lens group is f, the composite focal length of the fourth lens and the fifth lens is f45, and The following conditions are met: 0.45 < f/f45 < 1.34. 3. The six-piece wide-angle lens group according to claim 1, wherein the composite focal length of the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens is f23456, and the six The overall focal length of the lens-type wide-angle lens group is f and satisfies the following conditions: 0.56 < f/f23456 < 1.51. 4. The six-piece wide-angle lens group according to claim 1, wherein the focal length of the third lens is f3, the combined focal length of the fourth lens and the fifth lens is f45, and the following conditions are met: -3.75 < f3/f45 < -1.62. 5. The six-piece wide-angle lens group according to claim 1, wherein the composite 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: -6.04 < f6/f45 <-0.95. 6. The six-piece wide-angle lens set according to claim 1, wherein the thickness of the fourth lens on the optical axis is CT4, the thickness of the fifth lens on the optical axis is CT5, and the thickness of the fifth lens on the optical axis is CT5. The thickness of the third lens on the optical axis is CT3 and satisfies the following conditions: 3.78 < (CT4+CT5)/CT3 < 8.38. 7 . The six-piece wide-angle lens set according to claim 1 , wherein the thickness of the second lens on the optical axis is CT2 , the thickness of the third lens on the optical axis is CT3 , and satisfies 7 . The following conditions: 2.41 < CT2/CT3 < 5.78. 8 . The six-piece wide-angle lens set according to claim 1 , wherein the thickness of the sixth lens on the optical axis is CT6, the thickness of the third lens on the optical axis is CT3, and satisfies 8 . The following conditions: 1.07 < CT6/CT3 < 2.86. 9. The six-piece wide-angle lens set according to claim 1, wherein the thickness of the fourth lens on the optical axis is CT4, the thickness of the fifth lens on the optical axis is CT5, and the thickness of the fifth lens on the optical axis is CT5. The thickness of the first lens on the optical axis is CT1 and satisfies the following conditions: 1.41 < (CT4+CT5)/CT1 < 7.4. 10 . The six-piece wide-angle lens set according to claim 1 , wherein the composite focal length of the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens is f23456, and the six Half of the imaging height that can be captured by the wide-angle lens group on the imaging plane is IMH, and the following conditions are met: 0.99 < IMH/f23456 < 1.98. 11 . The six-piece wide-angle lens group according to claim 1 , wherein the overall focal length of the six-piece wide-angle lens group is f, and the six-piece wide-angle lens group can capture images on the imaging plane. 12 . Half of the height is IMH and meets the following conditions: 0.9 < IMH/f < 2.69. 12 . The six-piece wide-angle lens group according to claim 1 , wherein the distance from the image side surface of the sixth lens to the imaging surface on the optical axis is BFL, and the six-piece wide-angle lens group has a distance of BFL. 13 . The overall focal length is f and satisfies the following conditions: 0.79 <f/BFL < 2.17.

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