CN219871932U - Eight-piece type wide-angle lens module - Google Patents
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- CN219871932U CN219871932U CN202321126163.5U CN202321126163U CN219871932U CN 219871932 U CN219871932 U CN 219871932U CN 202321126163 U CN202321126163 U CN 202321126163U CN 219871932 U CN219871932 U CN 219871932U
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Abstract
The utility model provides an eight-lens wide-angle lens module, which comprises eight lenses, wherein a first lens has negative refractive power, a second lens and a third lens have positive refractive power, the object side surface of the second lens is a convex surface, the image side surface of the second lens is a concave surface, the object side surface of the third lens is a concave surface, the image side surface of the third lens is a convex surface, a fourth lens has positive refractive power, and a fifth lens has negative refractive power; the sixth lens has positive refractive power, and the image side surface of the sixth lens is a convex surface; the seventh lens has negative refractive power, the object side surface and the image side surface of the seventh lens are concave, the eighth lens has positive refractive power, and the object side surface and the image side surface of the eighth lens are convex, so that the effect of wide angle is achieved, but the trend of an optical path is gentle, and the manufacturing yield is increased.
Description
Technical Field
The present utility model relates to a lens module, and more particularly to an eight-piece wide-angle lens module.
Background
With the progress and development of optical technology, how to achieve the wide-angle effect of the optical lens in each electronic product is one of the targets desired by related industries.
Disclosure of Invention
In order to solve the above-mentioned problems, the present utility model provides an eight-lens wide-angle lens module, which achieves a wide-angle effect by matching the negative refractive power of the first lens with the focal length of the system, and the positive refractive powers of the second lens and the third lens make the light path trend smooth, so as to increase the manufacturing yield.
Accordingly, in one embodiment of the present utility model, an eight-lens wide-angle lens module is provided, which includes eight lenses, the eight lenses including, in order from an object side to an image side, a first lens, 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 having an object side facing the object side and an image side facing the image side, wherein: the first lens has a negative refractive power; the second lens has positive refractive power, the object side paraxial region of the second lens is a convex surface, and the image side paraxial region of the second lens is a concave surface; the third lens has positive refractive power, the object side paraxial region of the third lens is concave, and the image side paraxial region of the third lens is convex; 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 surface of the sixth lens is a convex surface at the paraxial region; the seventh lens has negative refractive power, and the object side surface and the image side surface of the seventh lens are concave surfaces at the paraxial regions; and the eighth lens has positive refractive power, and the object side surface and the image side surface of the eighth lens are convex at the paraxial regions. Wherein, eight lenses satisfy the following conditional expression:
8< ((r7×r8) + (r9×r10))/(f4+f5) <16, wherein the radius of curvature of the object side surface of the fourth lens element is R7, the radius of curvature of the image side surface of the fourth lens element is R8, the radius of curvature of the object side surface of the fifth lens element is R9, the radius of curvature of the image side surface of the fifth lens element is R10, the focal length of the fourth lens element is F4, and the focal length of the fifth lens element is F5. And the product of the curvature radius of the object side surface and the image side surface of the fourth lens and the fifth lens is configured to be compared with the sum of focal lengths of the fourth lens and the fifth lens to correct astigmatism.
0.08< | (F1/F) | (R2/R1) | <0.12, wherein the focal length of the overall system is F, the focal length of the first lens element is F1, the radius of curvature of the object-side surface of the first lens element is R1, and the radius of curvature of the image-side surface of the first lens element is R2. Therefore, the smaller the absolute value of the product of the focal length ratio of the first lens and the overall system and the curvature radius of the image side surface of the first lens and the curvature radius of the object side surface of the first lens, the wide-angle effect can be achieved.
-0.3< ((R9/R10) + (R11/R12))/(f5+f6) < -0.2, wherein the radius of curvature of the object side of the sixth lens is R11, the radius of curvature of the image side of the sixth lens is R12, and the focal length of the sixth lens is F6. Astigmatism is improved by matching the radius of curvature of the object side of the fifth lens element, the radius of curvature of the image side of the sixth lens element, the focal length of the fifth lens element, and the focal length of the sixth lens element.
Therefore, the utility model can achieve the wide-angle effect, but the light path trend is gentle to increase the manufacturing yield.
In another embodiment of the present utility model, the thickness of the object side of the fourth lens element is T7, the thickness of the image side thereof is T8, the thickness of the object side of the fifth lens element is T9, the thickness of the image side thereof is T10, the thickness of the object side of the sixth lens element is T11, the thickness of the image side thereof is T12, the thickness of the object side of the seventh lens element is T13, the thickness of the image side thereof is T14, and the thickness of the object side of the eighth lens element is T15, which satisfies the following condition: 3< (t7+t9+t11+t13+t15)/(t8+t10+t12+t14) <5.4. Therefore, the core thickness, the air interval and the like of the fourth lens to the eighth lens are matched with each other to achieve the effect of correcting aberration.
In another embodiment of the present utility model, the following conditional expression is also satisfied:
-0.9< (R9/R10) < -0.7 (R11/R12). The spherical aberration is improved by multiplying and collocating the ratio of the curvature radius of the object side surface of the fifth lens and the curvature radius of the image side surface of the sixth lens and the ratio of the curvature radius of the object side surface of the image side surface of the sixth lens.
In another embodiment of the present utility model, the radius of curvature of the object side surface of the third lens element is R5, the radius of curvature of the image side surface thereof is R6, and the following condition is satisfied: 4< (|R5|+|R6|) F <5. Therefore, the lens shape and the refractive power of the third lens are configured, so that the excessive change of the refractive power of the image side surface is avoided, and the aberration is effectively corrected.
In another embodiment of the present utility model, the following conditional expression is also satisfied: -1.75< F1/F < -1.55. The larger the focal length ratio of the first lens and the overall system is, the wide-angle effect can be achieved.
In another embodiment of the present utility model, the object side surface of the first lens element is convex.
In another embodiment of the present utility model, the image side of the first lens element is concave.
In another embodiment of the present utility model, the object side surface of the fourth lens element is convex.
In another embodiment of the present utility model, the image side surface of the fourth lens element is convex.
In another embodiment of the present utility model, the object side surface of the fifth lens element is concave.
In another embodiment of the present utility model, the image side surface of the fifth lens element is convex.
In another embodiment of the present utility model, the object side surface of the sixth lens element is convex.
In another embodiment of the present utility model, the seventh lens is spherical and made of glass.
In another embodiment of the present utility model, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the eighth lens are aspheric.
In another embodiment of the present utility model, the maximum viewing angle of the eight lenses is FOV, which satisfies the following condition: the FOV is more than or equal to 165.
The above objects, features and advantages of the present utility model will be best understood from the following detailed description and accompanying drawings and examples.
Drawings
Fig. 1 is a schematic structural diagram of a first embodiment of an eight-piece wide-angle lens module according to the present utility model.
Fig. 2 is a lateral chromatic aberration diagram of a first embodiment of an eight-piece wide-angle lens module of the present utility model.
Fig. 3A is a field curvature diagram of a first embodiment of an eight-piece wide-angle lens module according to the present utility model.
Fig. 3B is a distortion graph of the first embodiment of the eight-piece wide-angle lens module of the present utility model.
Fig. 4 is a schematic structural diagram of a second embodiment of an eight-piece wide-angle lens module according to the present utility model.
Fig. 5 is a lateral chromatic aberration diagram of a second embodiment of an eight-piece wide-angle lens module of the present utility model.
Fig. 6A is a field curvature diagram of a second embodiment of an eight-piece wide-angle lens module of the present utility model.
Fig. 6B is a distortion graph of a second embodiment of an eight-piece wide-angle lens module of the present utility model.
Fig. 7 is a schematic structural diagram of a third embodiment of an eight-piece wide-angle lens module according to the present utility model.
Fig. 8 is a lateral chromatic aberration diagram of a third embodiment of an eight-piece wide-angle lens module of the present utility model.
Fig. 9A is a field curvature diagram of a third embodiment of an eight-piece wide-angle lens module of the present utility model.
Fig. 9B is a distortion graph of a third embodiment of an eight-piece wide-angle lens module of the present utility model.
Fig. 10 is a schematic structural diagram of a fourth embodiment of an eight-piece wide-angle lens module of the present utility model.
Fig. 11 is a lateral chromatic aberration diagram of a fourth embodiment of an eight-piece wide-angle lens module of the present utility model.
Fig. 12A is a field curvature diagram of a fourth embodiment of an eight-piece wide-angle lens module of the present utility model.
Fig. 12B is a distortion graph of a fourth embodiment of an eight-piece wide-angle lens module of the present utility model.
Detailed Description
For the convenience of explanation of the central idea of the present utility model represented in the above summary, the present utility model is expressed in specific embodiments. The various objects in the embodiments are drawn to scale, size, deformation or displacement as appropriate for the description, and not to scale for the actual components, as previously described.
Referring to fig. 1, in a first embodiment of an eight-lens wide-angle lens module 100 according to the present utility model, the eight-lens wide-angle lens module 100 includes eight lenses, which sequentially include 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, and an eighth lens 80 from an object side a to an image side B along an optical axis L. The third lens 30 and the fourth lens 40 further include a first protective glass 90 and an aperture S, and the eighth lens 80 has a second protective glass 91 and an optical filter F disposed at a rear side thereof, and an imaging surface C is disposed behind the optical filter F. The eight lenses respectively have an object side surface facing the object side A and an image side surface facing the image side B.
The first lens 10 has a negative refractive power, wherein the first lens 10 is molded glass. In the first embodiment of the present utility model, the object side surface 11 of the first lens element 10 is convex at the paraxial region L. The image side 12 of the first lens element 10 is concave at the paraxial region L. The first lens 10 enables the whole module to have a wide angle effect.
The second lens 20 has a positive refractive power, wherein the second lens 20 is molded glass. The object-side surface 21 of the second lens element 20 is convex at the paraxial region L, and the image-side surface 22 is concave at the paraxial region L. The second lens 20 is matched with the first lens 10, so that the light direction is smooth and the manufacturing yield can be improved.
The third lens 30 has positive refractive power, wherein the third lens 30 is molded glass. The third lens element 30 has a concave object-side surface 31 at a paraxial region L and a convex image-side surface 32 at the paraxial region L.
The fourth lens 40 has positive refractive power, wherein the fourth lens 40 is molded glass. In the first embodiment of the present utility model, the object side surface 41 of the fourth lens element 40 is convex at the paraxial region L. The image side 42 of the fourth lens element 40 is convex at the paraxial region L. The fourth lens 40 is disposed behind the aperture S, and is convex lens and has positive refractive power, so that the optical path is gently reduced and the assembly sensitivity is improved.
The fifth lens 50 has a negative refractive power, wherein the fifth lens 50 is a molded glass. In the first embodiment of the present utility model, the object-side surface 51 of the fifth lens element 50 is concave at the paraxial region L. The image side surface 52 of the fifth lens element 50 is convex at the paraxial region L.
The sixth lens 60 has positive refractive power, wherein the sixth lens 60 is molded glass. The image side surface 62 of the sixth lens 60 is convex at the paraxial region L. In the first embodiment of the present utility model, the object side surface 61 of the sixth lens element 60 is convex at the paraxial region L. The sixth lens 60 and the fifth lens 50 cooperate to correct the system astigmatism.
The seventh lens element 70 has negative refractive power, and both the object-side surface 71 and the image-side surface 72 of the seventh lens element 70 are concave at the paraxial region L. In the first embodiment of the present utility model, the seventh lens 70 is made of glass. Thereby, the thickness and the space interval of the seventh lens 70 and other lenses are matched with each other, so as to correct the system coma.
The eighth lens 80 has a positive refractive power, wherein the eighth lens 80 is molded glass. The object-side surface 81 and the image-side surface 82 of the eighth lens element 80 are convex at the paraxial region L. Thereby, the shape of the image side 82 of the eighth lens element 80 is controlled to match the angle of the sensor chief ray to increase the relative illuminance.
Next, please refer to table one, which is a design parameter value of the eight-lens-element wide-angle lens module 100 in the present embodiment, wherein the numbers 1 to 22 in table one represent the surfaces of the elements in sequence, the odd number is the object side facing the object side a, the even number is the image side facing the 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 L, which is the same as in the following embodiment, and the detailed description will not be repeated:
list one
In the first embodiment, except for the seventh lens element 70, the first lens element 10, the second lens element 20, the third lens element 30, the fourth lens element 40, the fifth lens element 50, the sixth lens element 60 and the eighth lens element 80 are aspheric, and each aspheric parameter is shown in table two, wherein K is a conic coefficient in the aspheric curve equation, and 4th to 16th are the 4th to 16th aspheric coefficients of each surface, and the following embodiments are not repeated:
watch II
According to the above table one and table two, the relational values of the table three can be further obtained, wherein T1 to T16 represent the thickness of each lens and the distance between each lens, F is the focal length of the optical system (i.e. the focal length of the eight-lens wide-angle lens module 100), 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 sum of the lengths of the optical system, ATL represents the sum of the thicknesses of all lenses, gaa represents the sum of the distances of the optical axis gaps (without the last lens), and the following embodiments are also represented by the same method without repeating the following steps:
watch III
According to the design parameters, the following conditional expressions are satisfied in the embodiment of the present utility model,
8< ((r7×r8) + (r9×r10))/(f4+f5) <16, wherein the radius of curvature of the object-side surface 41 of the fourth lens element 40 is R7, the radius of curvature of the image-side surface 42 of the fourth lens element 40 is R8, the radius of curvature of the object-side surface 51 of the fifth lens element 50 is R9, the radius of curvature of the image-side surface 51 of the fifth lens element 50 is R10, the focal length of the fourth lens element 40 is F4, and the focal length of the fifth lens element 50 is F5. The product of the radii of curvature R9, R10 of the object-side surfaces 41, 51 and the image-side surfaces 42, 52 of the fourth lens element 40 and the fifth lens element 50 is configured to correct the system astigmatism by the sum ratio of the focal length F4 of the fourth lens element 40 and the focal length F5 of the fifth lens element 50.
Further, the following conditional expression is also satisfied in the embodiment of the present utility model,
0.08< | (F1/F) | <0.12, wherein the focal length of the first lens element 10 is F1, the radius of curvature of the object-side surface 11 of the first lens element 10 is R1, the radius of curvature of the image-side surface 12 of the first lens element 10 is R2, and the focal length of the eight lens elements is F. Therefore, the first lens element 10 has a negative refractive power, and the smaller the absolute value of the product of the focal length F1 of the first lens element 10 and the total focal length F ratio and the radius of curvature R2 of the image side 12 of the first lens element 10 and the radius of curvature R1 of the object side 11 of the first lens element 10 is, the wide angle effect can be achieved.
Further, the following conditional expression is also satisfied in the embodiment of the present utility model,
-0.3< ((R9/R10) + (R11/R12))/(f5+f6) < -0.2, wherein the radius of curvature of the object side 61 of the sixth lens 60 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. Astigmatism is improved by matching the radius of curvature R9 of the object-side surface 51, the radius of curvature R10 of the image-side surface 52, the radius of curvature R11 of the object-side surface 61 of the sixth lens element 60, the radius of curvature R12 of the image-side surface 62, the fifth lens focal length F5 and the sixth lens focal length F6 of the fifth lens element 50.
Further, the following conditional expression is also satisfied in the embodiment of the present utility model,
3< (t7+t9+t11+t13+t15)/(t8+t10+t12+t14) <5.4. The thickness of the object-side surface 41 of the fourth lens element 40 is T7, the thickness of the image-side surface 42 thereof is T8, the thickness of the object-side surface 51 of the fifth lens element 50 is T9, the thickness of the image-side surface 52 thereof is T10, the thickness of the object-side surface 61 of the sixth lens element 60 is T11, the thickness of the image-side surface 62 thereof is T12, the thickness of the object-side surface 71 of the seventh lens element 70 is T13, the thickness of the image-side surface 72 thereof is T14, and the thickness of the object-side surface 81 of the eighth lens element 80 is T15. Thereby, the ratio of the sum of the core thicknesses of the fourth lens 40 to the eighth lens 80 to the sum of the air gaps is configured to correct the system coma.
Furthermore, the following conditional expressions are also satisfied in the embodiment of the present utility model,
-0.9< (R9/R10) < -0.7 (R11/R12). The system spherical aberration is improved by multiplying the ratio of the radii of curvature R9, R10 of the object-side surface 51 and the image-side surface 52 of the fifth lens element 50 and the ratio of the radii of curvature R11, R12 of the object-side surface 61 and the image-side surface 62 of the sixth lens element 60.
Furthermore, the following conditional expressions are also satisfied in the embodiment of the present utility model,
4< (|R5|+|R6|) F <5. The radius of curvature of the object-side surface 31 of the third lens element 30 is R5, and the radius of curvature of the image-side surface 32 is R6. Thereby configuring the lens shape and refractive power of the third lens element 30, avoiding excessive refractive power variation of the image side B and effectively correcting the system aberration.
Further, the following conditional expression, -1.75< F1/F < -1.55 is also satisfied in the examples of the present utility model. Accordingly, the larger the ratio of the focal length F1 of the first lens element 10 to the focal length F of the eight lens elements is, the wide angle effect can be achieved.
Furthermore, the following conditional expression is satisfied in the embodiment of the utility model, the FOV is more than or equal to 165, and the maximum visual angle of the eight lenses is FOV.
Please refer to fig. 2, which is a lateral color chart of a first embodiment of the present utility model; fig. 3A and 3B show a field diagram and a distortion diagram of the first embodiment, so that the present utility model has a better imaging effect by the collocation and combination of the lenses.
As described above, in the eight-lens-element wide-angle lens module 100 of the present utility model, the first lens element 10 in front of the aperture stop S is a negative refractive power lens element and is matched with the second lens element 20 and the third lens element 30 to achieve the wide-angle effect, but the light path direction is gentle to increase the manufacturing yield, and the core thickness, the air space and the like of the fourth lens element 40 to the eighth lens element 80 are matched with each other to achieve the aberration correction effect.
Fig. 4 to 6 are schematic diagrams of an eight-piece wide-angle lens module 100a according to a second embodiment of the present utility model, fig. 5 is a lateral chromatic aberration diagram of a third embodiment, and fig. 6A and 6B are field curvature diagrams and distortion curves of the second embodiment, respectively. The second embodiment is configured substantially the same as the first embodiment in that the focal length F of the eight-piece wide-angle lens module 100a is 2.705mm, the entrance pupil aperture EPD is 1.455mm, the image height IMGH is 4.18mm, and the aperture value FNO is 1.85.
Next, referring to table four, the design parameter values of the eight-piece wide-angle lens module 100a in the second embodiment are shown:
table four
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 shown in table five:
TABLE five
According to the design parameters, the relational expression values of the sixth table can be further obtained:
TABLE six
| Relation type | Numerical value | Relation type | Numerical value |
| T1/F | 0.39 | R1/F | 21.27 |
| T2/F | 0.59 | R2/F | 1.15 |
| T3/F | 0.40 | R3/F | 4.04 |
| T4/F | 0.29 | R4/F | 6.44 |
| T5/F | 1.44 | R5/F | -2.60 |
| T6/F | 0.00 | R6/F | -2.09 |
| T7/F | 0.70 | R7/F | 1.98 |
| T8/F | 0.15 | R8/F | -3.72 |
| T9/F | 0.22 | R9/F | -0.69 |
| T10/F | 0.06 | R10/F | -1.06 |
| T11/F | 0.80 | R11/F | 2.01 |
| T12/F | 0.03 | R12/F | -1.84 |
| T13/F | 0.19 | R13/F | -1.55 |
| T14/F | 0.25 | R14/F | 9.02 |
| T15/F | 0.69 | R15/F | 9.05 |
| T16/F | 0.10 | R16/F | -2.48 |
| F/F1 | -0.63 | R1*R2 | 178.96 |
| F/F2 | 0.10 | R3*R4 | 190.37 |
| F/F3 | 0.19 | R5*R6 | 39.64 |
| F/F4 | 0.44 | R7*R8 | -53.83 |
| F/F5 | -0.28 | R9*R10 | 5.32 |
| F/F6 | 0.59 | R11*R12 | -27.09 |
| F/F7 | -0.65 | R13*R14 | -102.37 |
| F/F8 | 0.40 | R15*R16 | -163.95 |
| TTL | 20.42 | TTL/F | 7.55 |
| ATL | 13.05 | Gaa | 3.72 |
According to the foregoing conditions, the second embodiment of the present utility model also has the effects of the first embodiment.
Referring to fig. 7 to 9, a third embodiment of the present utility model is shown in fig. 7, which is a schematic structural diagram of an eight-piece wide-angle lens module 100B, fig. 8 is a lateral chromatic aberration diagram of the third embodiment, and fig. 9A and 9B are field curvature diagrams and distortion curves of the third embodiment, respectively. The third embodiment is configured substantially the same as the first embodiment, except that the focal length F of the eight-piece wide-angle lens module 100b is 2.586mm, the entrance pupil aperture EPD is 1.382mm, the image height IMGH is 4.191mm, and the aperture value FNO is 1.85.
Next, referring to table seven, the design parameter values of the eight-piece wide-angle lens module 100b in the third embodiment are shown:
watch seven
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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 eight:
table eight
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According to the design parameters, the relational expression values of the table nine can be further obtained:
table nine
| Relation type | Numerical value | Relation type | Numerical value |
| T1/F | 0.40 | R1/F | 20.69 |
| T2/F | 0.61 | R2/F | 1.20 |
| T3/F | 0.39 | R3/F | 4.05 |
| T4/F | 0.29 | R4/F | 6.24 |
| T5/F | 1.50 | R5/F | -2.72 |
| T6/F | 0.01 | R6/F | -2.19 |
| T7/F | 0.65 | R7/F | 2.38 |
| T8/F | 0.16 | R8/F | -3.21 |
| T9/F | 0.22 | R9/F | -0.79 |
| T10/F | 0.06 | R10/F | -1.14 |
| T11/F | 0.82 | R11/F | 2.27 |
| T12/F | 0.03 | R12/F | -1.81 |
| T13/F | 0.18 | R13/F | -1.62 |
| T14/F | 0.25 | R14/F | 9.21 |
| T15/F | 0.71 | R15/F | 10.83 |
| T16/F | 0.10 | R16/F | -2.52 |
| F/F1 | -0.60 | R1*R2 | 165.73 |
| F/F2 | 0.10 | R3*R4 | 168.88 |
| F/F3 | 0.18 | R5*R6 | 39.91 |
| F/F4 | 0.41 | R7*R8 | -51.15 |
| F/F5 | -0.22 | R9*R10 | 5.99 |
| F/F6 | 0.57 | R11*R12 | -27.51 |
| F/F7 | -0.62 | R13*R14 | -100.08 |
| F/F8 | 0.38 | R15*R16 | -182.79 |
| TTL | 19.88 | TTL/F | 7.69 |
| ATL | 12.60 | Gaa | 3.66 |
According to the foregoing conditions, the third embodiment of the present utility model also has the effects of the first embodiment.
Referring to fig. 10 to 12, which are schematic diagrams illustrating a structure of an eight-piece wide-angle lens module 100c according to a fourth embodiment of the present utility model, fig. 11 is a lateral chromatic aberration diagram of the fourth embodiment, and fig. 12A and 12B are field curvature diagrams and distortion curves of the fourth embodiment, respectively. The fourth embodiment is configured substantially the same as the first embodiment, except that the focal length F of the eight-piece wide-angle lens module 100c is 2.562mm, the entrance pupil aperture EPD is 1.423mm, and the image height IMGH is 4.022mm.
Next, referring to table ten, the design parameter values of the eight-piece wide-angle lens module 100c in the fourth embodiment are shown:
ten meters
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 shown in table eleven:
table eleven
According to the design parameters, the relational expression values of the twelve tables can be further obtained:
twelve watches
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According to the foregoing conditions, the fourth embodiment of the present utility model also has the effects of the first embodiment.
The above examples are only for illustrating the present utility model and are not intended to limit the scope of the present utility model. All modifications and variations which do not depart from the spirit of the utility model are intended to be within the scope of the utility model.
Symbol description
100 eight-piece wide angle lens module. 100a eight-piece wide angle lens module.
100b eight-piece wide angle lens module. 100c eight-piece wide angle lens module.
10 first lens. 11, object side surface.
12 image side. 20, a second lens.
21, object side. 22 image side.
30, a third lens. 31 object side.
32 image side. 40, fourth lens.
41 object side. 42 image side.
50, fifth lens. 51, object side.
52 image side. 60, sixth lens.
61 object side. 62 image side.
70, seventh lens. 71 object side.
72 image side. 80, eighth lens.
81 object side. 82 image side.
90, first protective glass. 91, second protective glass.
F, an optical filter. And A is the object side.
And B, an image side. S, an aperture.
And C, imaging surface. L is the optical axis.
Claims (15)
1. The eight-lens wide-angle lens module is characterized by comprising eight lenses, wherein the eight lenses sequentially comprise a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens along an optical axis from an object side to an image side, and the eight lenses respectively have an object side surface facing the object side and an image side surface facing the image side, wherein:
the first lens has a negative refractive power;
the second lens has positive refractive power, the object side surface of the second lens is a convex surface near the optical axis, and the image side surface of the second lens is a concave surface near the optical axis;
the third lens has positive refractive power, the object side surface of the third lens is concave near the optical axis, and the image side surface of the third lens is convex near the optical axis;
the fourth lens has a positive refractive power;
the fifth lens has a negative refractive power;
the sixth lens has positive refractive power, and the image side surface of the sixth lens is a convex surface near the optical axis;
the seventh lens is provided with negative refractive power, and the object side surface and the image side surface of the seventh lens are concave surfaces near the optical axis; and
the eighth lens has positive refractive power, and the object side surface and the image side surface of the eighth lens are both convex surfaces near the optical axis; wherein, eight lenses satisfy the following conditional expression: 8< ((r7×r8) + (r9×r10))/(f4+f5) <16, wherein the radius of curvature of the object side surface of the fourth lens element is R7, the radius of curvature of the image side surface of the fourth lens element is R8, the radius of curvature of the object side surface of the fifth lens element is R9, the radius of curvature of the image side surface of the fifth lens element is R10, the focal length of the fourth lens element is F4, and the focal length of the fifth lens element is F5;0.08< | (F1/F) | <0.12, (R2/R1) |, wherein 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 surface of the first lens is R1, and the radius of curvature of the image-side surface of the first lens is R2; and-0.3 < ((R9/R10) + (R11/R12))/(F5+F6) < -0.2, wherein the radius of curvature of the object side of the sixth lens is R11, the radius of curvature of the image side of the sixth lens is R12, and the focal length of the sixth lens is F6.
2. The eight-lens wide-angle lens module as set forth in claim 1, wherein the fourth lens element has a thickness T7 at the object-side surface thereof, a thickness T8 at the image-side surface thereof, a thickness T9 at the object-side surface thereof, a thickness T10 at the image-side surface thereof, a thickness T11 at the object-side surface thereof, a thickness T12 at the image-side surface thereof, a thickness T13 at the object-side surface thereof, a thickness T14 at the image-side surface thereof, and a thickness T15 at the object-side surface thereof, satisfying the following conditional expressions:
3<(T7+T9+T11+T13+T15)/(T8+T10+T12+T14)<5.4。
3. the eight-piece wide-angle lens module of claim 1, further satisfying the following conditional expression:
-0.9<(R9/R10)*(R11/R12)<-0.7。
4. the eight-piece wide-angle lens module of claim 1, wherein the third lens element has an object-side surface with a radius of curvature R5 and an image-side surface with a radius of curvature R6, and satisfies the following conditional expression:
4<(|R5|+|R6|)/F<5。
5. the eight-piece wide-angle lens module of claim 1, further satisfying the following conditional expression:
-1.75<F1/F<-1.55。
6. the eight-piece wide-angle lens module of claim 1, wherein the object-side surface of the first optic is convex.
7. The eight-piece wide-angle lens module of claim 1, wherein the image side of the first optic is concave.
8. The eight-piece wide-angle lens module of claim 1, wherein the fourth optic has a convex object-side surface.
9. The eight-piece wide-angle lens module of claim 1, wherein the image side of the fourth optic is convex.
10. The eight-piece wide-angle lens module of claim 1, wherein the object-side surface of the fifth lens element is concave.
11. The eight-piece wide-angle lens module of claim 1, wherein the image side of the fifth optic is convex.
12. The eight-piece wide-angle lens module of claim 1, wherein the object-side surface of the sixth lens element is convex.
13. The eight-piece wide-angle lens module of claim 1, wherein the seventh lens is spherical and is glass.
14. The eight-piece wide-angle lens module of 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 are all aspheric.
15. The eight-piece wide-angle lens module of claim 1, wherein the eight-piece lens has a maximum field of view FOV that satisfies the following conditional expression: the FOV is more than or equal to 165.
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| TW111121690 | 2022-06-10 | ||
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