CN212111945U - Imaging lens - Google Patents

Abstract

The utility model provides an imaging lens. The imaging lens includes: a lens barrel; the lens comprises at least two lenses, a lens barrel and a lens clamping device, wherein the lenses are arranged at intervals along the axial direction of the lens barrel, the object side surface of the optical mechanism area of at least one lens is provided with a plurality of first buckling structures, the image side surface of the optical mechanism area of at least one other lens is provided with a second buckling structure buckled with the first buckling structures, and the first buckling structures and the second buckling structures are arranged in a one-to-one correspondence manner; at least one spacer, the spacer setting is in the lens cone, and the spacer setting is between two lenses, and the spacer has a plurality of through-holes, and first lock structure or second lock structure pass the through-hole. The utility model provides an imaging lens have the problem that the MTF performance can not compromise with stray light among the prior art.

Description

Imaging lens

Technical Field

The utility model relates to an optical imaging equipment technical field particularly, relates to an imaging lens.

Background

With the background of full screen mobile phone proliferation, global mobile phone manufacturers have increasingly high requirements for the imaging quality of mobile phone products. The imaging lens is developing in the direction of combining a small size, a large image plane and a high pixel, and meanwhile, the requirements on the MTF (modulation transfer function) performance and the stray light of the lens are higher and higher.

The lens buckled between the lenses greatly improves the MTF performance and the yield of the lens, but the buckling of the lenses causes stray light to penetrate through the buckled part, so that serious stray light is caused, and the imaging quality of the lens is influenced.

That is to say, the imaging lens in the prior art has the problem that the MTF performance cannot be compatible with the stray light

SUMMERY OF THE UTILITY MODEL

A primary object of the present invention is to provide an imaging lens system to solve the problem that the MTF performance of the imaging lens system cannot be considered with stray light in the prior art.

In order to achieve the above object, according to an aspect of the present invention, there is provided an imaging lens including: a lens barrel; the lens comprises at least two lenses, a lens barrel and a lens clamping device, wherein the lenses are arranged at intervals along the axial direction of the lens barrel, the object side surface of the optical mechanism area of at least one lens is provided with a plurality of first buckling structures, the image side surface of the optical mechanism area of at least one other lens is provided with a second buckling structure buckled with the first buckling structures, and the first buckling structures and the second buckling structures are arranged in a one-to-one correspondence manner; at least one spacer, the spacer setting is in the lens cone, and the spacer setting is between two lenses, and the spacer has a plurality of through-holes, and first lock structure or second lock structure pass the through-hole.

Furthermore, a lens close to the image side end of the lens barrel in the lens is an image side lens, and the object side surface of the image side lens is provided with a first buckling structure; the lens close to the object side end of the lens barrel in the lens is an object side lens, and the image side surface of the object side lens is provided with a second buckling structure; the lens between the image side lens and the object side lens is a middle lens, the object side surface of the middle lens is provided with a first buckling structure, and the image side surface of the middle lens is provided with a second buckling structure.

Furthermore, the projection of the first buckling structure of the middle lens to the image side surface is staggered with the second buckling structure.

Furthermore, the first buckling structure is a boss, and the second buckling structure is a groove; or the first buckling structure is a groove, and the second buckling structure is a boss.

Furthermore, the area of the cross section of the boss in the direction parallel to the lens is reduced in the direction away from the lens, and the groove is flared.

Furthermore, the side wall of the lug boss far away from the center of the lens is used as a clamping surface of the lens, the clamping surface is obliquely arranged relative to the central axis of the lug boss, and the inclination angle m1 of the clamping surface is more than or equal to 15 degrees and less than or equal to 20 degrees.

Further, the side wall of the boss far from the center of the lens is used as a lens drawing surface of the lens, the lens drawing surface is obliquely arranged relative to the central axis of the boss, and the inclination angle m2 of the lens drawing surface is larger than 30 degrees.

Further, the width of the mesa of boss is more than or equal to 0.01 millimeter and less than or equal to 0.2 millimeter.

Furthermore, the lens is in interference fit with the gear of the lens barrel, and the interference fit amount of the lens and the gear of the lens barrel is more than or equal to 1 micron and less than or equal to 3 microns; and/or the lens and the spacer are arranged at intervals, and the interval m between the lens and the spacer is more than or equal to 0.003 mm and less than or equal to 0.01 mm.

Furthermore, the first buckling structure and the second buckling structure are in interference fit, and the interference fit amount of the first buckling structure and the second buckling structure is more than or equal to 1 micrometer and less than or equal to 3 micrometers; and/or the first buckling structure is overlapped with the second buckling structure, and the overlapping width b of the first buckling structure and the second buckling structure is more than or equal to 0.04 mm and less than or equal to 0.15 mm.

By applying the technical scheme of the utility model, the imaging lens comprises a lens cone, at least two lenses and at least one spacer, the lenses are arranged at intervals along the axial direction of the lens cone, the object side surface of the optical mechanism area of at least one lens is provided with a plurality of first buckling structures, the image side surface of the optical mechanism area of at least another lens is provided with a second buckling structure buckled with the first buckling structures, and the first buckling structures and the second buckling structures are arranged in a one-to-one correspondence manner; the spacer sets up in the lens cone, and the spacer setting is between two lenses, and the spacer has a plurality of through-holes, and first lock structure or second lock structure pass the through-hole.

Through setting up first lock structure and second lock structure on the lens for first lock structure can be in the same place with the stable lock of second lock structure, and then makes the connection that two adjacent lenses can be stable, avoids the condition of lens installation dislocation, has improved imaging lens's MTF performance and imaging lens's production yield simultaneously greatly. Through set up the through-hole on the spacer for first lock structure or second lock structure can pass through the through-hole and second lock structure or first lock structure lock. Because first lock structure and second lock structure are located the through-hole, just make the spacer can shelter from the clearance of the lock department of first lock structure and second lock structure, reduced stray light and kicked into the optics effective area, and then can guarantee imaging lens's imaging quality, realized guaranteeing under the prerequisite that the MTF performance is good, reduced stray light's production.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic view of an overall structure of an imaging lens according to a first embodiment of the present invention; and

FIG. 2 shows an enlarged view at P in FIG. 1;

FIG. 3 shows a view in the direction C-C of FIG. 1;

FIG. 4 shows a view from D-D in FIG. 1;

FIG. 5 shows a view E-E in FIG. 1;

FIG. 6 shows a view from direction F-F of FIG. 1;

FIG. 7 shows an angled view of the object side lens of FIG. 1;

FIG. 8 shows another angled view of the object side lens of FIG. 1;

FIG. 9 shows a view from A-A in FIG. 8;

FIG. 10 shows an enlarged view at G of FIG. 8;

FIG. 11 shows an angled view of the intermediate optic of FIG. 1;

FIG. 12 shows another angled view of the intermediate optic of FIG. 1;

FIG. 13 shows an enlarged view at H in FIG. 12;

FIG. 14 shows a view from the B-B direction in FIG. 12;

FIG. 15 shows another angled view of the intermediate optic of FIG. 1;

FIG. 16 shows a schematic view of the overall construction of the spacer of FIG. 1;

fig. 17 is a schematic view showing an overall configuration of an imaging lens according to a second embodiment of the present invention;

FIG. 18 shows an R-R view of FIG. 17;

FIG. 19 shows an S-S view of FIG. 17;

FIG. 20 shows a view from the T-T direction in FIG. 17;

FIG. 21 is a schematic view of an angle of the object side lens of FIG. 17;

FIG. 22 is a schematic view of another angle of the object side lens of FIG. 17;

FIG. 23 shows a schematic view of an angle of the intermediate optic of FIG. 17;

FIG. 24 shows a schematic view of another angle of the intermediate optic of FIG. 17;

FIG. 25 shows a schematic view of another angle of the intermediate optic of FIG. 17;

FIG. 26 is a schematic view showing the overall construction of the spacer of FIG. 17;

fig. 27 is a schematic view showing an overall configuration of an imaging lens according to a third embodiment of the present invention;

FIG. 28 shows a view from the direction J-J of FIG. 27;

FIG. 29 shows a view of the K-K orientation of FIG. 27;

FIG. 30 shows an M-M view of FIG. 27;

FIG. 31 shows an angled view of the object side lens of FIG. 27;

FIG. 32 shows another angled view of the object side lens of FIG. 27;

FIG. 33 shows an L-L view of FIG. 32;

FIG. 34 shows an angled view of the intermediate optic of FIG. 27;

FIG. 35 shows another angled view of the intermediate optic of FIG. 27;

FIG. 36 shows a view from the U-U direction in FIG. 35;

FIG. 37 shows another angled view of the intermediate optic of FIG. 27;

fig. 38 shows a schematic view of the overall structure of the spacer of fig. 27.

Wherein the figures include the following reference numerals:

10. a lens barrel; 20. a lens; 22. a first buckling structure; 21. a second fastening structure; 23. an object-side lens; 24. a middle lens; 25. an image side lens; 30. a spacer; 31. a through hole; 40. buckling the surface; 50. lens drawing surface; 60. a table-board.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

It is noted that, unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

In the present application, where the contrary is not intended, the use of directional words such as "upper, lower, top and bottom" is generally with respect to the orientation shown in the drawings, or with respect to the component itself in the vertical, perpendicular or gravitational direction; likewise, for ease of understanding and description, "inner and outer" refer to the inner and outer relative to the profile of the components themselves, but the above directional words are not intended to limit the invention.

In order to solve the problem that imaging lens has MTF performance and can not compromise with stray light among the prior art, the utility model provides an imaging lens.

As shown in fig. 1 to 38, an imaging lens includes a lens barrel 10, at least two lenses 20 and at least one spacer 30, the lenses 20 are arranged at intervals along an axial direction of the lens barrel 10, an object side surface of an optical mechanism area of at least one of the lenses 20 has a plurality of first buckling structures 22, an image side surface of an optical mechanism area of at least another one of the lenses 20 has a second buckling structure 21 buckled with the first buckling structures 22, and the first buckling structures 22 and the second buckling structures 21 are arranged in a one-to-one correspondence; the spacer 30 is disposed in the lens barrel 10, the spacer 30 is disposed between the two lenses 20, the spacer 30 has a plurality of through holes 31, and the first engaging structure 22 or the second engaging structure 21 passes through the through holes 31.

Through setting up first lock structure 22 and second lock structure 21 on lens 20 for first lock structure 22 can be in the same place with second lock structure 21 stable lock, and then makes the connection that two adjacent lenses 20 can be stable, avoids the condition of lens 20 installation dislocation, has improved imaging lens's MTF performance and imaging lens's production yield simultaneously greatly. Through the through hole 31 provided on the spacer 30, the first fastening structure 22 or the second fastening structure 21 can pass through the through hole 31 to be fastened with the second fastening structure 21 or the first fastening structure 22. Because first lock structure 22 and second lock structure 21 are located through-hole 31, just make spacer 30 can shelter from the clearance of first lock structure 22 with the lock department of second lock structure 21, reduced stray light and kicked into the optics effective area, and then can guarantee imaging lens's imaging quality, realized guaranteeing under the prerequisite that the MTF performance is good, reduced stray light's production.

As shown in fig. 1, the lens 20 close to the image side end of the lens barrel 10 is an image side lens 25, and an object side surface of the image side lens 25 has a first fastening structure 22; the lens 20 close to the object side end of the lens barrel 10 in the lens 20 is an object side lens 23, and an image side surface of the object side lens 23 has a second buckling structure 21; the lens 20 positioned between the image-side lens 25 and the object-side lens 23 in the lens 20 is an intermediate lens 24, an object-side surface of the intermediate lens 24 has a first fastening structure 22, and an image-side surface of the intermediate lens 24 has a second fastening structure 21. Set up like this and make every lens 20 all carry out the lock with adjacent lens 20 in the imaging lens to guarantee the stability that lens 20 arranged in lens cone 10, can also improve the MTF performance greatly simultaneously.

Specifically, the projection of the first engaging structure 22 of the middle lens 24 to the image side is offset from the second engaging structure 21. The arrangement ensures that the buckling parts of the two adjacent groups of lenses 20 are not overlapped, so that light cannot pass through the buckling parts of the lenses 20, the generation of stray light is reduced, and the imaging quality of the imaging lens is greatly improved.

It should be noted that two groups of adjacent lenses 20 appear on three lenses 20 arranged in sequence, and at this time, two groups of buckling positions between the three lenses 20 are not on the same horizontal plane, so as to ensure that light cannot pass through the buckling positions, thereby greatly reducing the generation of stray light.

Optionally, the first fastening structure 22 is a boss, and the second fastening structure 21 is a groove; or the first engaging structure 22 is a groove and the second engaging structure 21 is a boss. The matching form of the boss and the groove can ensure that the first buckling structure 22 and the second buckling structure 21 can be tightly buckled together, and the matching of the boss and the groove can reduce the light passing through the buckling part, reduce the generation of stray light and increase the imaging quality of the imaging lens.

As shown in fig. 10, the area of the cross section of the boss in the direction parallel to the lens 20 tends to decrease in the direction away from the lens 20, and the groove flares. The arrangement is convenient for manufacturing the boss and the groove, and meanwhile, the boss is buckled with the groove conveniently, so that the imaging lens is convenient to assemble.

As shown in fig. 10, the side wall of the boss away from the center of the lens 20 serves as the fastening surface 40 of the lens 20, the fastening surface 40 is inclined with respect to the central axis of the boss, and the inclination angle m1 of the fastening surface 40 is 15 degrees or more and 20 degrees or less. The buckling surface 40 is obliquely arranged, so that scratching in the assembling process can be prevented, assembling is facilitated, and the MTF performance and yield of the imaging lens are effectively improved.

As shown in fig. 10, the side wall of the boss away from the center of the lens 20 serves as a lens molding surface 50 of the lens 20, the lens molding surface 50 is disposed obliquely to the central axis of the boss, and the inclination angle m2 of the lens molding surface 50 is greater than 30 degrees. The lens extraction surface 50 is provided to facilitate removal of the lens 20 from the mold. Setting the tilt angle m2 of the lens mold release surface 50 to greater than 30 degrees facilitates rapid demolding of the lens 20 while avoiding scratching of the lens 20.

Optionally, the width of the mesa 60 of the boss is 0.01 mm or more and 0.2 mm or less. The mesa 60 of boss and the tank bottom of recess bear together to guarantee that the boss can be in the same place with the recess stable lock, and guarantee that lens 20 does not rock. If the width of the table 60 is less than 0.01 mm, the bearing area of the boss and the groove is too small, which is likely to cause unstable bearing of two adjacent lenses 20. If the width of the mesa 60 is greater than 0.2 mm, the bearing area of the boss and the groove is too large, and the space occupied by the boss and the groove is too large, which is not favorable for the miniaturization of the imaging lens. Limiting the width of the mesa 60 to 0.01 mm to 0.2 mm enables the boss and the groove to be stably supported together without occupying too much space of the lens 20, which is beneficial to miniaturization of the imaging lens.

Specifically, the lens 20 is in interference fit with the gear of the lens barrel 10, and the interference fit amount of the lens 20 and the gear of the lens barrel 10 is greater than or equal to 1 micrometer and less than or equal to 3 micrometers. The interference fit of the lens 20 and the lens barrel 10 can ensure that the lens 20 can be stably placed in the lens barrel 10, and the lens 20 can stably work. If the interference fit amount of the lens 20 and the gear of the lens barrel 10 is less than 1 micron, the lens 20 is easily separated from the gear of the lens barrel 10, so that the assembly of the lens 20 is unstable. If the interference fit amount of the lens 20 and the gear of the lens barrel 10 is greater than 3 micrometers, the lens 20 and the gear of the lens barrel 10 are too tightly abutted, so that the lens 20 is not easily assembled in the lens barrel 10. The interference fit amount of the gear of the lens 20 and the lens barrel 10 is limited within the range of 1 micron to 3 microns, so that the lens 20 is easily assembled on the lens barrel 10 and the stability of the assembly between the lens 20 and the lens barrel 10 is ensured.

Specifically, the lens 20 and the spacer 30 are spaced apart from each other, and the spacing m between the lens 20 and the spacer 30 is 0.003 mm or more and 0.01 mm or less. The spacing between the lens 20 and the spacer 30 can effectively prevent the spacer 30 from generating stray light due to baking deformation.

Specifically, the first fastening structure 22 and the second fastening structure 21 are in interference fit, and the interference fit amount of the first fastening structure 22 and the second fastening structure 21 is greater than or equal to 1 micron and less than or equal to 3 microns. If the interference fit amount of the first fastening structure 22 and the second fastening structure 21 is less than 1 μm, the first fastening structure 22 and the second fastening structure 21 are not fastened tightly, so that the first fastening structure 22 is easily separated from the second fastening structure 21. If the interference fit amount between the first fastening structure 22 and the second fastening structure 21 is greater than 3 microns, the first fastening structure 22 and the second fastening structure 21 are too tight to be abutted against each other, so that the first fastening structure 22 is not easily fastened with the second fastening structure 21. The interference fit amount of the first buckling structure 22 and the second buckling structure 21 is limited within the range of 1 micron to 3 microns, so that the first buckling structure 22 and the second buckling structure 21 are easy to buckle and are not easy to break away, and the buckling stability of the first buckling structure 22 and the second buckling structure 21 is improved.

Optionally, the first fastening structure 22 and the second fastening structure 21 are overlapped, and the overlapping width b of the first fastening structure 22 and the second fastening structure 21 is greater than or equal to 0.04 mm and less than or equal to 0.15 mm. This arrangement can ensure a tight engagement between the first engaging structure 22 and the second engaging structure 21.

Example one

In the embodiment shown in fig. 1-16, the lens 20 has two first fastening structures 22, the image side surface of the middle lens 24 has a second fastening structure 21, and the object side surface of the middle lens 24 has a first fastening structure 22. In this embodiment, the interference fit between the lenses 20 is 3 microns. There is a 5 micron separation between lens 20 and spacer 30.

Optionally, the difference between the radian of the through hole 31 and the radian of the first buckling structure 22 is 3 degrees. Therefore, the first buckling structure 22 or the second buckling structure 21 can be ensured to pass through the through hole 31, light can be effectively reduced from passing through a gap between the first buckling structure 22 or the second buckling structure 21 and the through hole 31, and stray light is reduced.

In this embodiment, the curvature of the first engaging structure 22 is 90 degrees, and the curvature of the through hole 31 of the spacer 30 is 93 degrees, so that it can be ensured that the first engaging structure 22 or the second engaging structure 21 passes through the through hole 31.

Example two

The difference from the first embodiment is that the number of the first buckling structures 22 on the lens 20 is different.

In the embodiment shown in fig. 17-26, the lens 20 has three first fastening structures 22, the image side surface of the middle lens 24 has three second fastening structures 21, and the object side surface of the middle lens 24 has three first fastening structures 22. In this embodiment, the interference fit between the lenses 20 is 3 microns. There is a 5 micron separation between lens 20 and spacer 30.

In this embodiment, the radian of the first engaging structure 22 is 60 degrees, and the radian of the through hole 31 of the spacer 30 is 63 degrees, so that the first engaging structure 22 or the second engaging structure 21 can be ensured to pass through the through hole 31.

EXAMPLE III

The difference from the first embodiment is that the number of the first buckling structures 22 on the lens 20 is different.

In the embodiment shown in fig. 27-38, the lens 20 has four first fastening structures 22, the image side surface of the middle lens 24 has four second fastening structures 21, and the object side surface of the middle lens 24 has four first fastening structures 22. In this embodiment, the interference fit between the lenses 20 is 3 microns. There is a 5 micron separation between lens 20 and spacer 30.

In this embodiment, the radian of the first engaging structure 22 is 45 degrees, and the radian of the through hole 31 of the spacer 30 is 48 degrees, so that the first engaging structure 22 or the second engaging structure 21 can be ensured to pass through the through hole 31.

It is obvious that the above described embodiments are only some of the embodiments of the present invention, and not all of them. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. An imaging lens, characterized by comprising:

a lens barrel (10);

the lens comprises at least two lenses (20), the lenses (20) are arranged at intervals along the axial direction of the lens barrel (10), the object side surface of the optical mechanism area of at least one lens (20) is provided with a plurality of first buckling structures (22), the image side surface of the optical mechanism area of at least another lens (20) is provided with a second buckling structure (21) buckled with the first buckling structures (22), and the first buckling structures (22) and the second buckling structures (21) are arranged in a one-to-one correspondence manner;

at least one spacer (30), wherein the spacer (30) is arranged in the lens barrel (10), the spacer (30) is arranged between the two lenses (20), the spacer (30) is provided with a plurality of through holes (31), and the first buckling structure (22) or the second buckling structure (21) penetrates through the through holes (31).

2. Imaging lens according to claim 1,

the lens (20) close to the image side end of the lens barrel (10) in the lens (20) is an image side lens (25), and the object side surface of the image side lens (25) is provided with the first buckling structure (22);

the lens (20) close to the object side end of the lens barrel (10) in the lens (20) is an object side lens (23), and the image side surface of the object side lens (23) is provided with the second buckling structure (21);

the lens (20) between the image side lens (25) and the object side lens (23) in the lens (20) is an intermediate lens (24), an object side surface of the intermediate lens (24) has the first fastening structure (22), and an image side surface of the intermediate lens (24) has the second fastening structure (21).

3. Imaging lens according to claim 2, characterized in that the projection of the first snap-in structure (22) of the intermediate lens (24) to the image side is offset from the second snap-in structure (21).

4. Imaging lens according to claim 1,

the first buckling structure (22) is a boss, and the second buckling structure (21) is a groove; or

The first buckling structure (22) is a groove, and the second buckling structure (21) is a boss.

5. Imaging lens according to claim 4, characterized in that the area of the cross section of the boss in a direction parallel to the lens (20) tapers away from the lens (20) and the groove flares.

6. The imaging lens according to claim 5, wherein a side wall of the boss away from the center of the lens (20) serves as a fastening surface (40) of the lens (20), the fastening surface (40) is inclined with respect to a central axis of the boss, and an inclination angle m1 of the fastening surface (40) is greater than or equal to 15 degrees and less than or equal to 20 degrees.

7. Imaging lens according to claim 5, characterized in that the side wall of the boss remote from the center of the lens (20) serves as a lens drawing surface (50) of the lens (20), the lens drawing surface (50) is obliquely arranged with respect to the central axis of the boss, and the inclination angle m2 of the lens drawing surface (50) is greater than 30 degrees.

8. The imaging lens according to claim 5, characterized in that the width of the mesa (60) of the boss is 0.01 mm or more and 0.2 mm or less.

9. Imaging lens according to any one of claims 1 to 8,

the lens (20) is in interference fit with the gear of the lens barrel (10), and the interference fit amount of the lens (20) and the gear of the lens barrel (10) is more than or equal to 1 micrometer and less than or equal to 3 micrometers; and/or

The lens (20) and the spacer (30) are arranged at intervals, and the interval m between the lens (20) and the spacer (30) is greater than or equal to 0.003 mm and less than or equal to 0.01 mm.

10. Imaging lens according to any one of claims 1 to 8,

the first buckling structure (22) is in interference fit with the second buckling structure (21), and the interference fit amount of the first buckling structure (22) and the second buckling structure (21) is more than or equal to 1 micrometer and less than or equal to 3 micrometers; and/or

The first buckling structure (22) is in lap joint with the second buckling structure (21), and the lap joint width b of the first buckling structure (22) and the second buckling structure (21) is more than or equal to 0.04 mm and less than or equal to 0.15 mm.

Images