TWI814436B - Eight-piece wide-angle lens module - Google Patents

Abstract

An eight-piece wide-angle lens includes eight lenses. The first lens has a negative diopter. The second lens and the third lens have a positive diopter. The object side of the second lens is convex, and the image side is concave-and-convex. The object side of the third lens is concave, and the image side is convex. The fourth lens has a positive diopter. The fifth lens has a negative diopter. The sixth lens has a positive diopter, and the image side is convex. The seventh lens has a negative diopter, and both the object side and image side are concave. The eighth lens has a positive diopter, and both the object side and image side are convex. With such configuration, a wide-angle effect is achieved, and the optical path is gradual, so that the yield rate is improved.

Description

Eight-element wide-angle lens module

The invention relates to a lens module, in particular to an eight-piece wide-angle lens module.

With the advancement and development of optical technology, how to make the optical lenses in various electronic products achieve a wide-angle effect has become one of the goals pursued by relevant industries.

In order to solve the above problems, the present invention provides an eight-piece wide-angle lens module, which uses the negative refractive power of the first lens to match the focal length of the system to achieve a wide-angle effect. The positive refractive power of the second lens and the third lens smoothes the optical path to increase the Manufacturing yield.

Therefore, one embodiment of the present invention provides an eight-piece wide-angle lens module, which includes eight lenses. The eight lenses sequentially include a first lens, a first lens, and a first lens along an optical axis from an object side to an image side. A second lens, a third lens, an aperture, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens, and the eight lenses respectively have object side surfaces facing the object side and The image side facing the image side, wherein: the first lens has negative refractive power; the second lens has positive refractive power, the object side of the second lens is convex at the paraxial axis and the image side of the paraxial axis is concave; the third lens has Positive refractive power, the third lens has a concave surface at the paraxial axis on the object side and a convex surface at the paraxial axis at the image side; the fourth lens It has positive refractive power; the fifth lens has negative refractive power; the sixth lens has positive refractive power, and the image side of the sixth lens is convex at the paraxial axis; the seventh lens has negative refractive power, and the object side and image side of the seventh lens have a paraxial axis. and the eighth lens has positive refractive power, and both the object side and the image side of the eighth lens are convex at the paraxial axis. Among them, eight lenses satisfy the following conditional expression: 8<((R7*R8)+(R9*R10))/(F4+F5)<16. Among them, the radius of curvature of the object side of the fourth lens is R7, and the radius of curvature of the fourth lens is R7. The radius of curvature of the image side of the lens is R8, the radius of curvature of the object side of the fifth lens is R9, the radius of curvature of the image side of the fifth lens is R10, the focal length of the fourth lens is F4, and the focal length of the fifth lens is F5. Thereby, the ratio of the product of the curvature radii of the object side and the image side of the fourth lens and the fifth lens to the sum of the focal lengths of the fourth lens and the fifth lens is configured to correct astigmatism.

0.08<|(F1/F)*(R2/R1)|<0.12, where the focal length of the overall system is F, the focal length of the first lens is F1, the radius of curvature of the object side of the first lens is R1, and the focal length of the first lens is R1. The radius of curvature of the image side is R2. Therefore, the first lens is a lens with negative refractive power, and the smaller the absolute value of the product of the ratio of the focal length of the first lens to the focal length of the entire system and the radius of curvature of the image side of the first lens and the radius of curvature of the object side of the first lens is smaller, the wider-angle effect can be achieved.

-0.3<((R9/R10)+(R11/R12))/(F5+F6)<-0.2, where the radius of curvature of the object side of the sixth lens is R11, and the radius of curvature of the image side of the sixth lens is R12, the sixth lens has a focal length of F6. Astigmatism is improved by matching the curvature radius of the object side of the fifth lens, the curvature radius of the image side, the curvature radius of the object side of the sixth lens, the curvature radius of the image side, the focal length of the fifth lens, and the focal length of the sixth lens.

Accordingly, the present invention can achieve a wide-angle effect, but the optical path is gentle to increase the manufacturing yield.

In another embodiment of the present invention, the thickness of the object side of the fourth lens is T7, and its image The thickness of the side surface is T8, the thickness of the object side of the fifth lens is T9, and the thickness of its image side is T10. The thickness of the object side of the sixth lens is T11, and the thickness of its image side is T12. The thickness of the object side of the seventh lens is T12. The thickness of the lens is T13, the thickness of the image side is T14, and the thickness of the object side of the eighth lens is T15, which satisfies the following conditional expression: 3<(T7+T9+T11+T13+T15)/(T8+T10+T12 +T14)<5.4. Thereby, the core thickness, air gap, etc. of the fourth lens to the eighth lens are matched with each other to achieve the effect of correcting aberrations.

In another embodiment of the present invention, the following conditional expression is further satisfied: -0.9<(R9/R10)*(R11/R12)<-0.7. Spherical aberration is improved through the product combination of the curvature radius ratio of the object side and image side of the fifth lens and the curvature radius ratio of the object side and image side of the sixth lens.

In another embodiment of the present invention, the radius of curvature of the object side of the third lens is R5, and the radius of curvature of the image side is R6, and the following conditional expression is satisfied: 4<(|R5|+|R6|) /F<5. Thereby, the lens shape and refractive power of the third lens element are configured to avoid excessive changes in the refractive power of the image side and to effectively correct aberrations.

In another embodiment of the present invention, the following conditional expression is further satisfied: -1.75<F1/F<-1.55. The greater the ratio between the focal length of the first lens and the focal length of the overall system, the wider the angle effect can be achieved.

In another embodiment of the present invention, the object side surface of the first lens is a convex surface.

In another embodiment of the present invention, the image side of the first lens is a concave surface.

In another embodiment of the present invention, the object side surface of the fourth lens is a convex surface.

In another embodiment of the present invention, the image side of the fourth lens element is convex.

In another embodiment of the present invention, the object side surface of the fifth lens element is a concave surface.

In another embodiment of the present invention, the image side of the fifth lens element is convex.

In another embodiment of the present invention, the object side surface of the sixth lens is a convex surface.

In another embodiment of the present invention, the seventh lens is spherical and made of glass.

In another embodiment of the present invention, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the eighth lens are all aspherical surfaces.

165。 In another embodiment of the present invention, the maximum viewing angle of the eight lenses is FOV, which satisfies the following conditional expression: FOV

165.

The above and objects, technical features and advantages of the present invention will be best understood from the following detailed description and corresponding drawings and embodiments.

100: Eight-element wide-angle lens module

100a: Eight-element wide-angle lens module

100b: Eight-element wide-angle lens module

100c: Eight-element wide-angle lens module

10:First lens

11: Side view of object

12: Like side view

20:Second lens

21: Side of object

22: Like side view

30:Third lens

31: Side of object

32: Like side view

40:Fourth lens

41: Side of object

42: Like side view

50:Fifth lens

51: Side of object

52: Like side view

60:The sixth lens

61: Side of object

62: Like side view

70:The seventh lens

71: Side of object

72: Like side view

80:The eighth lens

81: Side of object

82: Like side view

90:The first protective glass

91: Second protective glass

F: filter

A: object side

B:Image side

S: aperture

C: Imaging surface

L: optical axis

Figure 1 is a schematic structural diagram of an eight-piece wide-angle lens module according to a first embodiment of the present invention.

Figure 2 is a lateral chromatic aberration diagram of the first embodiment of the eight-element wide-angle lens module of the present invention.

FIG. 3A is a field curvature diagram of the first embodiment of the eight-element wide-angle lens module of the present invention.

Figure 3B is a distortion curve diagram of the first embodiment of the eight-piece wide-angle lens module of the present invention.

Figure 4 is a schematic structural diagram of an eight-piece wide-angle lens module according to a second embodiment of the present invention.

Figure 5 is a lateral color aberration diagram of the second embodiment of the eight-element wide-angle lens module of the present invention.

FIG. 6A is a field curvature diagram of the second embodiment of the eight-element wide-angle lens module of the present invention.

Figure 6B is a distortion curve diagram of the second embodiment of the eight-piece wide-angle lens module of the present invention.

Figure 7 is a schematic structural diagram of the third embodiment of the eight-piece wide-angle lens module of the present invention.

Figure 8 is a lateral color aberration diagram of the third embodiment of the eight-element wide-angle lens module of the present invention.

Figure 9A is a field curvature diagram of the third embodiment of the eight-element wide-angle lens module of the present invention.

Figure 9B is a distortion curve diagram of the third embodiment of the eight-piece wide-angle lens module of the present invention.

Figure 10 is a schematic structural diagram of the fourth embodiment of the eight-piece wide-angle lens module of the present invention.

Figure 11 is a lateral chromatic aberration diagram of the fourth embodiment of the eight-element wide-angle lens module of the present invention.

Figure 12A is a field curvature diagram of the fourth embodiment of the eight-element wide-angle lens module of the present invention.

Figure 12B is a distortion curve diagram of the fourth embodiment of the eight-piece wide-angle lens module of the present invention.

In order to facilitate the explanation of the central idea of the present invention expressed in the above summary column, specific embodiments are hereby expressed. Various objects in the embodiments are drawn according to proportions, sizes, deformations or displacements suitable for illustration, rather than according to the proportions of actual components, and are explained first.

Please refer to FIG. 1 , which is a first embodiment of an eight-piece wide-angle lens module 100 of the present invention. The eight-piece wide-angle lens module 100 includes eight lenses. The eight lenses are connected along an optical axis L from an object side A. The image side B includes a first lens 10, a second lens 20, a third lens 30, a fourth lens 40, a fifth lens 50, a sixth lens 60, a seventh lens 70, An eighth lens 80. Among them, a first protective glass 90 and an aperture S are also included between the third lens 30 and the fourth lens 40, and a second protective glass 91 and a filter F are provided on the back side of the eighth lens 80. There is also an imaging plane C behind F. The eight lenses respectively have an object side facing the object side A and an image side facing the image side B.

The first lens 10 has negative refractive power, wherein the first lens 10 is made of molded glass. In the first embodiment of the present invention, the object side surface 11 of the first lens 10 is a convex surface at the parenchyma axis L. The image side surface 12 of the first lens 10 is concave at the parenchyma axis L. The first lens 10 gives the entire module a wide-angle effect.

The second lens 20 has positive refractive power, wherein the second lens 20 is made of molded glass. The object side 21 of the second lens 20 is a convex surface at the pared optical axis L, and the image side 22 is a concave surface at the pared optical axis L. The second lens 20 is matched with the first lens 10 to smooth the light path and improve the manufacturing yield.

The third lens 30 has positive refractive power, wherein the third lens 30 is made of molded glass. The object side 31 of the third lens 30 is a concave surface at the pared optical axis L, and the image side 32 is a convex surface at the pared optical axis L.

The fourth lens 40 has positive refractive power, wherein the fourth lens 40 is made of molded glass. In the first embodiment of the present invention, the object side surface 41 of the fourth lens 40 is a convex surface at the parenchyma axis L. The image side surface 42 of the fourth lens 40 is convex at the parenchymal axis L. Thereby, the fourth lens 40 is disposed behind the aperture S, and because it is a convex lens and has positive refractive power, the optical path is gently lowered, thereby improving assembly sensitivity.

The fifth lens 50 has negative refractive power, wherein the fifth lens 50 is made of molded glass. In the first embodiment of the present invention, the object side surface 51 of the fifth lens 50 is a concave surface at the parenchyma axis L. The image side surface 52 of the fifth lens 50 is a convex surface at the parenchymal axis L.

The sixth lens 60 has positive refractive power, wherein the sixth lens 60 is made of molded glass. The image side surface 62 of the sixth lens 60 is a convex surface at the parenchyma axis L. In the first embodiment of the present invention, the object side surface 61 of the sixth lens 60 is a convex surface at the parenchyma axis L. The sixth lens 60 and the fifth lens 50 cooperate with each other to correct the system astigmatism problem.

The seventh lens 70 has negative refractive power, and both the object side 71 and the image side 72 of the seventh lens 70 are concave at the paraxial axis L. In the first embodiment of the present invention, the seventh lens 70 is made of glass. Thereby, the seventh lens 70 matches the thickness and spacing of other lenses to correct the system coma.

The eighth lens 80 has positive refractive power, and the eighth lens 80 is made of molded glass. The object side 81 and the image side 82 of the eighth lens 80 are both convex surfaces at the parenchyma axis L. Thereby, the shape of the image side 82 of the eighth lens 80 is controlled to match the sensor chief ray angle, so as to improve the relative illumination.

Next, please refer to Table 1, which is the design parameter value of the eight-piece wide-angle lens module 100 in this embodiment. Among them, the numbers 1 to 22 in Table 1 represent the surfaces of each component in order, and the odd numbers represent the facing surfaces. For the object side of object side A, the even number is the image side facing image side B, and the thickness of the object side represents the thickness of each lens, and the thickness of the image side represents the distance between each lens and the next lens or the next element on the optical axis. The spacing on L is also the same in the following embodiments, and will not be repeated:

In the first embodiment, except for the seventh lens 70, the first lens 10, the second lens 20, the third lens 30, the fourth lens 40, the fifth lens 50, the sixth lens 60 and the eighth lens 80 are all The aspheric surface parameters are shown in Table 2. Among them, K is the cone coefficient in the aspheric curve equation, and 4th to 16th represent the 4th to 16th order aspherical coefficients of each surface. In the following embodiments, The same, without repeating them again:

Based on the aforementioned Tables 1 and 2, the relationship values in Table 3 can be further obtained. Among them, T1 to T16 represent the thickness of each lens and the spacing between each lens, and F is the focal length of the optical system (i.e., the eight-element wide-angle lens module 100 Focal length), F1 to F8 represent the focal length of each lens, R1 to R16 represent the radius of curvature of each surface of each lens, TTL represents the total length of the optical system, ATL represents the total thickness of all lenses, Gaa represents the total distance of the optical axis gap (not Including the last lens), the same method will be used in the following embodiments, and will not be repeated:

According to the foregoing design parameters, the following conditional expression is satisfied in the embodiment of the present invention, 8<((R7*R8)+(R9*R10))/(F4+F5)<16, where the object side 41 of the fourth lens 40 The radius of curvature is R7, the radius of curvature of the image side 42 of the fourth lens 40 is R8, the radius of curvature of the object side 51 of the fifth lens 50 is R9, the radius of curvature of the image side 51 of the fifth lens 50 is R10, and the radius of curvature of the image side 51 of the fifth lens 50 is R10. 40 has a focal length of F4, and the fifth lens 50 has a focal length of F5. The product of the curvature radii R9 and R10 of the object side surfaces 41 and 51 and the image side surfaces 42 and 52 of the fourth lens 40 and the fifth lens 50 is calculated by the focal length of the fourth lens 40 The total ratio of F4 and the fifth lens 50 focal length F5 is used to correct system astigmatism.

Furthermore, in the embodiment of the present invention, the following conditional expression is satisfied, 0.08<|(F1/F)*(R2/R1)|<0.12, where the focal length of the first lens 10 is F1, and the object side of the first lens 10 The radius of curvature of 11 is R1, the radius of curvature of the image side 12 of the first lens 10 is R2, and the focal length of the eight lenses is F. Therefore, the first lens 10 has negative refractive power, and the ratio of the focal length F1 of the first lens 10 to the overall focal length F is greater than the absolute value of the product of the curvature radius R2 of the image side 12 of the first lens 10 and the curvature radius R1 of the object side 11 of the first lens 10 . Small, wide-angle effect can be achieved.

Further, in the embodiment of the present invention, the following conditional expression is further satisfied, -0.3<((R9/R10)+(R11/R12))/(F5+F6)<-0.2, where the object side 61 of the sixth lens 60 The radius of curvature is R11, the radius of curvature of the image side 62 of the sixth lens 60 is R12, and the focal length of the sixth lens 60 is F6. By matching the curvature radius R9 of the object side 51 of the fifth lens 50, the curvature radius R10 of the image side 52, the curvature radius R11 of the object side 61 of the sixth lens 60, the curvature radius R12 of the image side 62, the fifth lens focal length F5 and The sixth lens has a focal length of F6 to improve astigmatism.

Furthermore, in the embodiment of the present invention, the following conditional expression is satisfied, 3<(T7+T9+T11+T13+T15)/(T8+T10+T12+T14)<5.4. Among them, the thickness of the object side 41 of the fourth lens 40 is T7, the thickness of the image side 42 is T8, the thickness of the object side 51 of the fifth lens 50 is T9, the thickness of the image side 52 is T10, and the sixth lens 60 The thickness of the object side 61 is T11, the thickness of the image side 62 is T12, the thickness of the object side 71 of the seventh lens 70 is T13, the thickness of the image side 72 is T14, the thickness of the object side 81 of the eighth lens 80 for T15. Thereby, the ratio of the total core thickness of the fourth lens 40 to the eighth lens 80 and the total air gap is configured to correct the system coma.

Furthermore, the following conditional expression is also satisfied in the embodiment of the present invention, -0.9<(R9/R10)*(R11/R12)<-0.7. Through the curvature of the object side 51 and the image side 52 of the fifth lens 50 The ratio of the curvature radii R9 and R10 and the product of the ratio of the curvature radii R11 and R12 of the object side 61 and the image side 62 of the sixth lens 60 are used to improve the system spherical aberration.

Furthermore, the following conditional expression is also satisfied in the embodiment of the present invention, 4<(|R5|+|R6|)/F<5. The object side surface 31 of the third lens 30 has a curvature radius R5, and the image side surface 32 has a curvature radius R6. The lens shape and refractive power of the third lens element 30 are thereby configured to avoid excessive changes in the refractive power of the image side B and to effectively correct system aberrations.

Furthermore, the following conditional expression is also satisfied in the embodiment of the present invention, -1.75<F1/F<-1.55. Accordingly, the greater the ratio between the focal length F1 of the first lens 10 and the focal length F of the eight lenses, the wider the angle effect can be achieved.

165，八片鏡片的最大視角為FOV。 Furthermore, the following conditional expression is also satisfied in the embodiment of the present invention, FOV

165, the maximum viewing angle of eight lenses is FOV.

Please refer to Figure 2, which is a lateral chromatic aberration diagram of the first embodiment of the present invention; Figures 3A and 3B are shown as field curvature diagrams and distortion curves of the first embodiment. Through the matching and combination of the aforementioned lenses, The invention has better imaging effect.

Based on the above, the eight-piece wide-angle lens module 100 of the present invention achieves a wide-angle effect by using the first lens 10 in front of the aperture S as a negative refractive power lens and the second lens 20 and the third lens 30 as positive refractive power lenses. However, the optical path is flat to increase the manufacturing yield, and the core thickness, air gap, etc. of the fourth lens 40 to the eighth lens 80 are matched with each other to achieve the effect of correcting aberrations.

Please refer to Figures 4 to 6, which are a second embodiment of the present invention. Figure 4 is a schematic structural diagram of an eight-piece wide-angle lens module 100a. Figure 5 is a lateral color aberration diagram of the third embodiment. As shown in Figures 6A and 6B, They are field curve diagrams and distortion curve diagrams of the second embodiment respectively. The configuration of the second embodiment is roughly the same as that of the first embodiment. The difference lies in that the focal length F of the eight-element wide-angle lens module 100a is 2.705mm, the entrance pupil diameter EPD is 1.455mm, the image height IMGH is 4.18mm, and the aperture value FNO is 1.85.

Next, please refer to Table 4, which is the design parameter value of the eight-piece wide-angle lens module 100a in the second embodiment:

In the third embodiment, the aspherical parameters of the first lens 10 , the second lens 20 , the third lens 30 , the fourth lens 40 , the fifth lens 50 , the sixth lens 60 and the eighth lens 80 are as shown in Table 5. Show:

Based on the aforementioned design parameters, the relationship values in Table 6 can be further derived:

Based on the above conditions, the second embodiment of the present invention also has the effects of the first embodiment.

Please refer to Figures 7 to 9, which are a third embodiment of the present invention. Figure 7 is a schematic structural diagram of an eight-piece wide-angle lens module 100b. Figure 8 is a lateral color aberration diagram of the third embodiment. As shown in Figures 9A and 9B, They are field curve diagrams and distortion curve diagrams of the third embodiment respectively. The configuration of the third embodiment is roughly the same as that of the first embodiment. The difference lies in that the focal length F of the eight-element wide-angle lens module 100b is 2.586mm, the entrance pupil diameter EPD is 1.382mm, the image height IMGH is 4.191mm, and the aperture value FNO is 1.85.

Next, please refer to Table 7, which is the design parameter value of the eight-piece wide-angle lens module 100b in the third embodiment:

In the third embodiment, the aspherical parameters of the first lens 10 , the second lens 20 , the third lens 30 , the fourth lens 40 , the fifth lens 50 , the sixth lens 60 and the eighth lens 80 are as shown in Table 8. Show:

Based on the aforementioned design parameters, the relationship values in Table 9 can be further derived:

Based on the aforementioned conditions, the third embodiment of the present invention also has the effects of the first embodiment.

Please refer to Figures 10 to 12, which are the fourth embodiment of the present invention. Figure 10 is a schematic structural diagram of an eight-piece wide-angle lens module 100c. Figure 11 is a lateral color aberration diagram of the fourth embodiment. As shown in Figures 12A and 12B, They are field curve diagrams and distortion curve diagrams of the fourth embodiment respectively. The configuration of the fourth embodiment is roughly the same as that of the first embodiment. The difference lies in that the focal length F of the eight-element wide-angle lens module 100c is 2.562mm, the entrance pupil diameter EPD is 1.423mm, and the image height IMGH is 4.022mm.

Next, please refer to Table 10, which is the design parameter value of the eight-piece wide-angle lens module 100c in the fourth embodiment:

In the sixth embodiment, the aspherical parameters of the first lens 10 , the second lens 20 , the third lens 30 , the fourth lens 40 , the fifth lens 50 , the sixth lens 60 and the eighth lens 80 are as shown in Table 11. Shown:

Based on the aforementioned design parameters, the relationship values in Table 12 can be further obtained:

Based on the aforementioned conditions, the fourth embodiment of the present invention also has the effects of the first embodiment.

The above embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. All modifications or changes that do not violate the spirit of the present invention fall within the scope of the invention.

100: Eight-element wide-angle lens module

10:First lens

11: Side view of object

12: Like side view

20:Second lens

21: Side of object

22: Like side view

30:Third lens

31: Side of object

32: Like side view

40:Fourth lens

41: Side of object

42: Like side view

50:Fifth lens

51: Side of object

52: Like side view

60:The sixth lens

61: Side of object

62: Like side view

70:The seventh lens

71: Side of object

72: Like side view

80:The eighth lens

81: Side of object

82: Like side view

90: Filter

91: Side of object

92: Like side view

A: object side

B:Image side

S: aperture

C: Imaging surface

L: optical axis

Claims (15)

An eight-piece wide-angle lens module includes eight lenses. The eight lenses sequentially include a first lens, a second lens, a third lens, and a third lens along an optical axis from an object side to an image side. A fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens, and the eight lenses respectively have an object side facing the object side and an image side facing the image side, wherein: The first lens has negative refractive power; The second lens has positive refractive power, the object side of the second lens is convex near the optical axis, and the image side of the second lens is concave near the optical axis; The third lens has positive refractive power, the object side of the third lens is concave near the optical axis, and the image side of the third lens is convex near the optical axis; The fourth lens has positive refractive power; The fifth lens has negative refractive power; The sixth lens has positive refractive power, and the image side of the sixth lens is convex near the optical axis; The seventh lens has negative refractive power, and both the object side and the image side of the seventh lens are concave near the optical axis; and The eighth lens has positive refractive power, and both the object side and the image side of the eighth lens are convex near the optical axis; wherein, the eight lenses satisfy the following conditional expression: 8＜((R7*R8)+(R9* R10))/(F4+F5)<16, where the radius of curvature of the object side of the fourth lens is R7, the radius of curvature of the image side of the fourth lens is R8, and the radius of curvature of the object side of the fifth lens is R9, the radius of curvature of the image side of the fifth lens is R10, the focal length of the fourth lens is F4, the focal length of the fifth lens is F5; 0.08＜|(F1/F)*(R2/R1)|＜ 0.12, where the focal length of the overall system is F, the focal length of the first lens is F1, the radius of curvature of the object side of the first lens is R1, and the radius of curvature of the image side of the first lens is R2; and -0.3< ((R9/R10)+(R11/R12))/(F5+F6)<-0.2, where the radius of curvature of the object side of the sixth lens is R11, and the radius of curvature of the image side of the sixth lens is R12 , the focal length of the sixth lens is F6. The eight-element wide-angle lens module as claimed in claim 1, wherein the thickness of the object side of the fourth lens is T7, the thickness of the image side is T8, the thickness of the object side of the fifth lens is T9, and the thickness of the image side is T9. The thickness of the side surface is T10, the thickness of the object side of the sixth lens is T11, and the thickness of the image side is T12. The thickness of the object side of the seventh lens is T13, and the thickness of the image side is T14. The eighth lens The thickness of the side of the object is T15, which satisfies the following conditional expression: 3＜(T7+T9+T11+T13+T15)/(T8+T10+T12+T14)＜5.4. The eight-element wide-angle lens module as described in claim 1 further satisfies the following conditional expression: -0.9＜(R9/R10)*(R11/R12)＜-0.7. The eight-element wide-angle lens module as claimed in claim 1, wherein the object side of the third lens has a curvature radius of R5, and the image side of the third lens has a curvature radius of R6, and satisfies the following conditional expression: 4＜(｜R5｜+｜R6｜)/F＜5. The eight-element wide-angle lens module as described in claim 1 further satisfies the following conditional expression: -1.75＜F1/F＜-1.55. The eight-element wide-angle lens module as claimed in claim 1, wherein the object side surface of the first lens is a convex surface. The eight-element wide-angle lens module as claimed in claim 1, wherein the image side of the first lens is a concave surface. The eight-element wide-angle lens module as claimed in claim 1, wherein the object side surface of the fourth lens element is a convex surface. The eight-piece wide-angle lens module as claimed in claim 1, wherein the image side of the fourth lens element is convex. The eight-element wide-angle lens module as claimed in claim 1, wherein the object side surface of the fifth lens element is a concave surface. The eight-element wide-angle lens module as claimed in claim 1, wherein the image side of the fifth element is convex. The eight-element wide-angle lens module as claimed in claim 1, wherein the object side surface of the sixth lens element is a convex surface. The eight-piece wide-angle lens module as claimed in claim 1, wherein the seventh lens is spherical and made of glass. The eight-piece wide-angle lens module as claimed in claim 1, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the eighth lens All are aspherical. The eight-element wide-angle lens module as described in claim 1, wherein the maximum viewing angle of the eight lenses is FOV, which satisfies the following conditional expression: FOV≥165.

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