Lens driving device

Abstract

The utility model provides a lens driving device. The lens driving device comprises a housing, a magnetic steel assembly, a circuit board assembly, an elastic support, a driving coil assembly and an image sensor. The image sensor is arranged opposite to the opening along the optical axis direction; the magnetic steel assembly and the driving coil assembly are oppositely arranged along the optical axis to drive the image sensor to move relative to the shell along the direction perpendicular to the optical axis; the circuit board assembly comprises a first circuit board fixed to the elastic support in a stacked mode and a second circuit board connected with the first circuit board. The drive coil assembly is fixed to the side, facing the magnetic steel assembly, of the first circuit board. The first circuit board is electrically connected with an external circuit through the second circuit board; the first circuit board is a PCB circuit board, the second circuit board is an FPC circuit board, and the first circuit board and the second circuit board are integrally formed. Compared with the prior art, the lens driving device is compact in structure, space-saving and good in anti-shake driving effect.

Description

TECHNICAL FIELD

[0001] The utility model relates to a field of anti-shake technology especially relates to a lens driving device. BACKGROUND

[0002] With the improvement of the shooting experience of consumers, the anti-shake function of the lens driving device is widely used in various camera devices. The combination of the lens driving device and various portable electronic devices such as mobile phones, cameras, computers and the like is also favored by consumers.

[0003] The lens driving device of the related art generally comprises a shell, a circuit board arranged in the shell, a magnetic steel or a coil fixed on the circuit board, a coil or a magnetic steel fixed to the shell, and a lens holder fixed to the circuit board; the circuit board is arranged by a plurality of circuit board welding stacks to improve the structural strength of the circuit board, the lens module is fixed on the lens holder, the circuit board is elastically supported by a spring piece, when the coil applies current, the coil and the magnetic steel group generate an electromagnetic field, the coil is subjected to the Lorentz force of the electromagnetic field, and the lens holder is driven to move along the direction perpendicular to the optical axis, thereby driving the lens module to realize the anti-shake performance. However, the spring piece for elastically supporting the circuit board in the lens driving device has a high manufacturing cost, and the lens holder is supported by the whole formed by the welding stack of the circuit board, which increases the overall height of the lens driving device and has poor space utilization.

[0004] Therefore, it is necessary to provide a new lens driving device to solve the above technical problems. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a lens driving device which has small overall space, good driving effect and better anti-shake effect.

[0006] In order to achieve the above purpose, the utility model provides a lens driving device which comprises a shell, a magnetic steel assembly fixed to the shell, a circuit board assembly suspended in the shell, an elastic support for supporting the circuit board assembly in the shell, a driving coil assembly stacked and fixed to the circuit board assembly and electrically connected with the circuit board assembly, and an image sensor fixed to the circuit board assembly; the shell is provided with an opening penetrating the shell along the optical axis direction of the image sensor, and the image sensor is arranged opposite to the opening along the optical axis direction; the magnetic steel assembly and the driving coil assembly are arranged opposite to each other along the optical axis direction to drive the image sensor to move relative to the shell along the direction perpendicular to the optical axis direction.

[0007] The circuit board assembly comprises a first circuit board fixed on the elastic support and a second circuit board connected with the first circuit board; the driving coil assembly is fixed on the side of the first circuit board facing the magnetic steel assembly; the second circuit board electrically connects the first circuit board with external circuit.

[0008] The first circuit board is a PCB circuit board, and the second circuit board is a FPC circuit board.

[0009] Preferably, the thickness of the first circuit board is greater than that of the second circuit board.

[0010] Preferably, the second circuit board comprises a circuit board body, a flexible extension part extending from the side of the circuit board body away from the first circuit board, a connecting part bent and extending from the opposite ends of the circuit board body towards the side close to the first circuit board, and a fixing part bent and extending from the connecting part towards the side close to the first circuit board; the circuit board body is spaced from the first circuit board, and the fixing part is fixed on the first circuit board.

[0011] The shell is provided with an avoiding slot formed through the side perpendicular to the optical axis direction, and the flexible extension part is electrically connected with external circuit through the avoiding slot.

[0012] Preferably, the driving coil assembly comprises a coil substrate fixed on the first circuit board and a driving coil fixed on the side of the coil substrate facing the magnetic steel assembly.

[0013] Preferably, the magnetic steel assembly and the driving coil assembly interact to drive the image sensor to move in a first direction and a second direction perpendicular to the optical axis direction, the first direction is perpendicular to the second direction, and the lens driving device further comprises an anti-collision assembly fixed on the first circuit board; the anti-collision assembly comprises first anti-collision blocks fixed on the opposite sides of the first circuit board along the first direction, and second anti-collision blocks fixed on the opposite sides of the first circuit board along the second direction.

[0014] Preferably, the lens driving device further comprises a connecting piece, and the two ends of the connecting piece are fixed with the first anti-collision blocks and the second anti-collision blocks, respectively.

[0015] Preferably, the shell comprises a bottom cover and an upper cover fixed on the bottom cover; the elastic support comprises a support body arranged in the inner side of the upper cover, a first mounting part and a second mounting part extending from the two ends of the support body towards the side close to the circuit board assembly; the circuit board assembly is fixed on the first mounting part, the second mounting part is fixed on the bottom cover, and the magnetic steel assembly is fixed on the upper cover.

[0016] The upper cover comprises an upper cover body in the shape of a rectangular frame, a support part extending from one end of the upper cover body away from the bottom cover, the support part surrounding the opening, and the upper cover further comprising a first damping part and a second damping part extending from the inner edge of the support part towards the bending part close to the bottom cover;

[0017] The first damping part extends into the first limiting groove, and the second damping part extends into the second limiting groove.

[0018] Preferably, the first damping part has the same width parallel to the first direction and the same width parallel to the second direction, and the second damping part has the same width parallel to the first direction and the same width parallel to the second direction.

[0019] Preferably, the first circuit board is provided with a through hole penetrating the first circuit board along the optical axis direction, the lens driving device further comprises a sensor support fixed to the first circuit board, the sensor support is fixed to the first circuit board and covers the through hole, and the image sensor is fixed to one side of the sensor support facing the opening and located in the through hole.

[0020] Compared with the prior art, in the lens driving device, the driving coil assembly and the magnetic steel assembly are respectively fixed on the circuit board assembly and the shell, the driving coil assembly is spaced apart from the magnetic steel assembly, the shell is provided with an opening penetrating the shell along the optical axis direction of the image sensor, and the image sensor is arranged opposite to the opening along the optical axis direction; the magnetic steel assembly and the driving coil assembly are arranged opposite to each other along the optical axis direction to drive the image sensor to move relative to the shell along a direction perpendicular to the optical axis direction; the circuit board assembly comprises a first circuit board fixed on one side of the elastic support and a second circuit board connected with the first circuit board; the driving coil assembly is fixed on one side of the first circuit board facing the magnetic steel assembly; the second circuit board electrically connects the first circuit board with an external circuit; the first circuit board is a PCB circuit board, and the second circuit board is an FPC circuit board; through the combination of the soft and hard of the first circuit board and the second circuit board, the stacking height of the circuit board assembly is further reduced; the first circuit board and the second circuit board are formed in an integrated structure, the welding between the first circuit board and the second circuit board is reduced, the necessary stacking height along the optical axis direction during welding can be saved, the overall stacking height is reduced, and the installation space is extremely utilized. BRIEF DESCRIPTION OF DRAWINGS

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0022] Figure 1 A three-dimensional structural schematic diagram of the lens driving device provided in an embodiment of this utility model;

[0023] Figure 2 A partial exploded view of the lens driving device provided in an embodiment of this utility model;

[0024] Figure 3 An exploded perspective view of the lens driving device provided in an embodiment of this utility model;

[0025] Figure 4 for Figure 1 Sectional view along line AA;

[0026] Figure 5 for Figure 1 Sectional view along line BB;

[0027] Figure 6 A top view of the anti-collision component provided in an embodiment of this utility model;

[0028] Figure 7 This is a schematic diagram of the circuit board assembly provided in an embodiment of the present utility model.

[0029] In the diagram, 100 is the lens drive device; 1 is the housing; 101 is the bottom cover; 102 is the top cover; 1021 is the top cover body; 1022 is the support part; 1023 is the first damping part; 1024 is the second damping part; 1025 is the opening; 1026 is the perforation; 1027 is the clearance groove; 2 is the elastic bracket; 21 is the bracket body; 22 is the first mounting part; 23 is the second mounting part; 3 is the circuit board assembly; 31 is the first circuit board; 311 is the through hole; 32 is the second circuit board; 321 is the circuit board body; 322 is the flexible extension part; 323 is the connecting part; 32 4. Fixing part; 4. Drive coil assembly; 41. Coil substrate; 42. Drive coil; 421. First coil group; 422. Second coil group; 5. Magnet assembly; 51. First magnet unit; 52. Second magnet unit; 6. First magnetic conductive sheet; 7. Second magnetic conductive sheet; 8. Frame; 9. Anti-collision assembly; 91. First anti-collision block; 911. First limiting groove; 92. Second anti-collision block; 921. Second limiting groove; 93. Connector; 10. Image sensor; 11. First driving chip; 12. Second driving chip; 13. Filter; 14. Sensor bracket. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the utility model will be apparently and completely described in connection with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the utility model.

[0031] In combination with Figures 1 to 7 The utility model embodiment provides a lens drive device 100, including the casing 1, the magnet steel subassembly 5 of fixed in casing 1, the circuit board subassembly 3 of suspension in casing 1, the elastic support 2 of support circuit board subassembly 3 in casing 1, the drive coil subassembly 4 of fixed in circuit board subassembly 3 and with circuit board subassembly 3 electricity connection, and the image sensor 10 of fixed in circuit board subassembly 3, casing 1 is equipped with the opening 1025 along the optical axis direction of image sensor 10 and is penetrated, image sensor 10 is opposite to the opening 1025 along the optical axis direction, drive coil subassembly 4 is spaced apart with magnet steel subassembly 5, magnet steel subassembly 5 and drive coil subassembly 4 are opposite to set along the optical axis direction to drive image sensor 10 relative to the casing along the perpendicular to the optical axis direction movement.

[0032] Optionally, the lens drive device 100 further comprises a frame 8 and a filter 13, the frame 8 is opposite to the opening 1025 and is fixed to the circuit board assembly 3, and the filter 13 is fixedly installed on the frame 8.

[0033] The circuit board assembly 3 includes a first circuit board 31 fixed to the elastic support 2 and a second circuit board 32 connected to the first circuit board 31; the drive coil assembly 4 is fixed to one side of the first circuit board 31 facing the magnet steel assembly 5; and the second circuit board 32 electrically connects the first circuit board 31 and an external circuit. The first circuit board 31 and the second circuit board 32 are formed in an integrated structure, reducing the welding between the first circuit board 31 and the second circuit board 32, saving the necessary stacking height in the optical axis direction during welding, thereby reducing the overall stacking height and maximizing the installation space. The first circuit board 31 is a PCB circuit board, which is a hard circuit board with high structural strength and good support effect. The second circuit board 32 is a FPC circuit board, which is flexible, thin and saves the stacking height in the optical axis direction. Therefore, the combination of the first circuit board 31 and the second circuit board 32 further reduces the stacking height of the circuit board assembly 3.

[0034] Specifically, the second circuit board 32 is connected to the peripheral side of the first circuit board 31, and the first circuit board 31 and the second circuit board 32 do not overlap in the direction of the optical axis of the image sensor 10, so that the circuit board assembly 3 has a small stacking height.

[0035] In this embodiment, the thickness of the first circuit board 31 is greater than the thickness of the second circuit board 32, so that the first circuit board 31 has high structural strength and good support performance.

[0036] In this embodiment, the second circuit board 32 includes a circuit board body 321, a flexible extension 322 extending from the side of the circuit board body 321 away from the first circuit board 31, a connecting portion 323 bent and extending from the opposite ends of the circuit board body 321 towards the side close to the first circuit board 31, and a fixing portion 324 bent and extending from the connecting portion 323 towards the side close to the first circuit board 31; the circuit board body 321 is spaced from the first circuit board 31, and the fixing portion 324 is fixed to the first circuit board 321. The housing 1 is provided with an avoiding slot 1027 formed through one side perpendicular to the optical axis direction, and the flexible extension 322 is electrically connected to the external circuit through the avoiding slot 1027. This facilitates the provision of power supply for the driving coil assembly 4 through the flexible extension 1027.

[0037] In this embodiment, the driving coil assembly 4 includes a coil substrate 41 fixed to the first circuit board 31, and a driving coil 42 fixed to the side of the coil substrate 41 towards the magnetic steel assembly.

[0038] In this embodiment, the magnetic steel assembly 5 interacts with the driving coil assembly 4 to drive the image sensor 10 to move in a first direction X perpendicular to the optical axis direction and a second direction Y perpendicular to the optical axis direction, and the first direction X is perpendicular to the second direction Y.

[0039] The lens driving device 100 further includes an anti-collision assembly 9 fixed to the first circuit board; the anti-collision assembly 9 includes first anti-collision blocks 91 fixed to the opposite sides of the first circuit board 31 along the first direction X, and second anti-collision blocks 92 fixed to the opposite sides of the first circuit board 31 along the second direction Y. The first anti-collision blocks 91 and the second anti-collision blocks 92 can prevent the circuit board assembly 3 from colliding with the housing 1 when carrying the image sensor 10 to move, improve the motion stability, and also limit the rotation position of the frame 8 to prevent the image sensor 10 from rotating too much, with high safety.

[0040] The lens driving device 100 further comprises a connecting piece 93, two ends of the connecting piece 93 are fixed with the first anti-collision block 91 and the second anti-collision block 92 respectively. By arranging the connecting piece 93, the stability of the first anti-collision block 91 and the second anti-collision block 92 can be improved. It can be understood that the connecting piece 93 is four, and one connecting piece 93 is arranged between each adjacent first anti-collision block 91 and second anti-collision block 92.

[0041] In the embodiment, the shell 1 comprises a bottom cover 101 and an upper cover 102 fixed on the bottom cover 101. The elastic support 2 comprises a support body 21 arranged on the inner side of the upper cover 102, a first mounting portion 22 and a second mounting portion 23 arranged on two ends of the support body 21 and close to one side of the circuit board assembly 3, the circuit board assembly 3 is fixed on the first mounting portion 22, and the second mounting portion 23 is fixed on the bottom cover 101. The magnetic steel assembly 5 is fixed on the upper cover 102. The opening 1025 is formed on the upper cover 102.

[0042] In the embodiment, the first anti-collision block 91 is provided with a first limiting groove 911 recessed from one side close to the upper cover 102 to one side away from the upper cover 102, and the second anti-collision block 92 is provided with a second limiting groove 921 recessed from one side close to the upper cover 102 to one side away from the upper cover 102; the upper cover 102 comprises an upper cover body 1021 in the shape of a rectangular frame, a support portion 1022 extending from one side of the upper cover body 1021 away from the bottom cover 101 to the inner circumferential side thereof, the support portion 1022 surrounds the opening, and the upper cover 102 further comprises a first damping portion 1023 and a second damping portion 1024 formed by bending the inner circumferential edge of the support portion 1022 close to the bottom cover 101. The first damping portion 1023 and the second damping portion 1024 are arranged in the first limiting groove 911 and the second limiting groove 921 respectively. The avoiding groove 1027 is formed on one side of the upper cover body 1021.

[0043] In the embodiment, the first damping portion 1023 and the second damping portion 1024 have the same structure; the width of one side of the first damping portion 1023 parallel to the first direction X is the same as the width of one side of the first damping portion 1023 parallel to the second direction Y. The width of one side of the second damping portion 1024 parallel to the first direction X is the same as the width of one side of the second damping portion 1024 parallel to the second direction Y. The width of the first direction X and the second direction Y are perpendicular to each other and perpendicular to the optical axis direction. The first damping portion 1023 and the second damping portion 1024 are arranged in a stamping laminated structure, the thickness and width directions have the same size, the damping effect perpendicular to the optical axis direction is consistent, and the damping effect is good.

[0044] In the embodiment, the driving coil assembly 4 comprises a first coil group 421 and a second coil group 422 arranged at intervals, the first coil group 421 is arranged along one diagonal line of the circuit board assembly 3, and the second coil group 422 is arranged along another diagonal line of the circuit board assembly 3; the magnetic steel assembly 5 comprises a first magnetic steel unit 51 spaced apart from the first coil group 421 and a second magnetic steel unit 52 spaced apart from the second coil group 422, the first magnetic steel unit 51 is a Halbach magnetic circuit, the first coil group 421 interacts with the first magnetic steel unit 51 to drive the circuit board assembly 3 carrying the image sensor 10 to move in a first direction X, and the second coil group 422 interacts with the second magnetic steel unit 52 to drive the circuit board assembly 3 carrying the image sensor 10 to move in a second direction Y.

[0045] In the embodiment, the first coil group 421 and the second coil group 422 are arranged at the four corner positions of the circuit board assembly 3, so that the first magnetic steel unit 51 and the second magnetic steel unit 52 also correspond to the four corner positions of the circuit board assembly 3. By arranging multiple coils and multiple magnetic steels, the overall driving force of the lens driving device 100 is improved, and the installation space is saved.

[0046] In the embodiment, the lens driving device 100 further comprises a first driving chip 11 and a second driving chip 12, the first driving chip 11 is arranged in the first coil group 421 and is used to control the first coil group 421 to interact with the magnetic steel assembly 5 to move in the first direction X, and the second driving chip 12 is arranged in the second coil group 422 and is used to control the second coil group 422 to interact with the magnetic steel assembly 5 to move in the second direction Y.

[0047] In the embodiment, the lens driving device 100 further comprises a first magnetic conducting sheet 6, the first magnetic conducting sheet 6 is fixed to the side of the magnetic steel assembly 5 away from the driving coil assembly 4, and the housing is provided with an opening 1026 penetrating the housing, and the first magnetic conducting sheet is arranged in the opening 1026. The first magnetic conducting sheet 6 enhances the magnetic conducting effect of the magnetic steel assembly 5.

[0048] In the embodiment, the lens driving device 100 further comprises a second magnetic conducting sheet 7, the second magnetic conducting sheet 7 is fixed to the housing 1, the second magnetic conducting sheet 7 is located on the side of the driving coil assembly 4 away from the magnetic steel assembly 5, and the second magnetic conducting sheet 7 is arranged opposite to the magnetic steel assembly 5. The magnetic conducting performance is enhanced.

[0049] In the embodiment, the first circuit board 31 is provided with a through hole 311 penetrating the first circuit board 31 along the optical axis direction, the lens driving device 100 further comprises a sensor bracket 14 fixed to the first circuit board 31, the sensor bracket 14 is fixed to the first circuit board 31 and covers the through hole 311, and the image sensor 10 is fixed to a side of the sensor bracket 14 facing the opening 1025 and located in the through hole 311.

[0050] Compared with the prior art, in the lens driving device, the driving coil assembly and the magnetic steel assembly are fixed on the circuit board assembly and the shell respectively, the driving coil assembly is spaced apart from the magnetic steel assembly, the shell is provided with an opening penetrating the shell along the optical axis direction of the image sensor, the image sensor is arranged opposite to the opening along the optical axis direction; the magnetic steel assembly and the driving coil assembly are arranged opposite to each other along the optical axis direction to drive the image sensor to move relative to the shell along a direction perpendicular to the optical axis direction; the circuit board assembly comprises a first circuit board fixed on one side of the elastic bracket and a second circuit board connected with the first circuit board; the driving coil assembly is fixed on a side of the first circuit board facing the magnetic steel assembly; the second circuit board electrically connects the first circuit board with an external circuit; the first circuit board is a PCB circuit board, and the second circuit board is a FPC circuit board; the soft and hard combination of the first circuit board and the second circuit board further reduces the stacking height of the circuit board assembly; the first circuit board and the second circuit board are formed in an integrated structure, welding between the first circuit board and the second circuit board is reduced, necessary stacking height along the optical axis direction during welding can be saved, the overall stacking height is reduced, and the installation space is limitedly utilized.

[0051] The above only describes the embodiments of the utility model, and it should be pointed out that, for ordinary skilled persons in the art, improvements can be made without departing from the creative concept of the utility model, but these all belong to the protection scope of the utility model.

Claims

1. A lens driving device, comprising a housing, a magnet assembly fixed to the housing, a circuit board assembly suspended in the housing, an elastic support supporting the circuit board assembly in the housing, a driving coil assembly fixed to the circuit board assembly and electrically connected to the circuit board assembly, and an image sensor fixed to the circuit board assembly; the housing is provided with an opening penetrating the housing along an optical axis direction of the image sensor, the image sensor is arranged opposite to the opening along the optical axis direction; the magnet assembly and the driving coil assembly are arranged opposite to each other along the optical axis direction to drive the image sensor to move relative to the housing along a direction perpendicular to the optical axis direction; characterized in that, the circuit board assembly comprises a first circuit board fixed to the elastic support and a second circuit board connected to the first circuit board; the driving coil assembly is fixed to one side of the first circuit board facing the magnet assembly; the second circuit board electrically connects the first circuit board to an external circuit. the first circuit board is a PCB circuit board, and the second circuit board is a FPC circuit board; the first circuit board and the second circuit board are integrally formed.

2. The lens driving device according to claim 1, wherein the thickness of the first circuit board is greater than the thickness of the second circuit board.

3. The lens driving device according to claim 1, wherein the second circuit board comprises a circuit board body, a flexible extension formed by extending one side of the circuit board body away from the first circuit board, a connecting portion formed by bending and extending opposite ends of the circuit board body towards the side close to the first circuit board, and a fixing portion formed by bending and extending the connecting portion towards the side close to the first circuit board; the circuit board body is spaced apart from the first circuit board, and the fixing portion is fixed to the first circuit board. the housing is provided with an avoiding slot formed penetrating one side of the housing perpendicular to the optical axis direction, and the flexible extension passes through the avoiding slot to be electrically connected to the external circuit.

4. The lens driving device according to claim 1, wherein the driving coil assembly comprises a coil substrate fixed to the first circuit board and a driving coil fixed to one side of the coil substrate facing the magnet assembly.

5. The lens driving apparatus according to claim 1, wherein the magnet assembly and the driving coil assembly interact to drive the image sensor to move along a first direction and a second direction perpendicular to the optical axis direction, the first direction being perpendicular to the second direction; the lens driving device further comprises an anti-collision assembly fixed to the first circuit board; the anti-collision assembly comprises first anti-collision blocks fixed to opposite sides of the first circuit board along the first direction, and second anti-collision blocks fixed to opposite sides of the first circuit board along the second direction.

6. The lens driving apparatus according to claim 5, wherein the lens driving device further comprises a connecting member, two ends of the connecting member being fixed to the first anti-collision blocks and the second anti-collision blocks respectively.

7. The lens driving apparatus according to claim 6, wherein the housing comprises a bottom cover and an upper cover fixed to the bottom cover; the elastic support comprises a support body arranged inside the upper cover, a first mounting portion and a second mounting portion extending from two ends of the support body towards the side close to the circuit board assembly; the circuit board assembly is fixed to the first mounting portion, the second mounting portion is fixed to the bottom cover, and the magnet assembly is fixed to the upper cover.

8. The lens driving apparatus according to claim 7, wherein The first anti-collision block is provided with a first limiting groove recessed from a side close to the upper cover to a side away from the upper cover, and the second anti-collision block is provided with a second limiting groove recessed from a side close to the upper cover to a side away from the upper cover. The upper cover comprises an upper cover body in the shape of a rectangular frame, a support part extended from an end of the upper cover body away from the bottom cover, the support part surrounding to form the opening, and the upper cover further comprises a first damping part and a second damping part extended from inner edges of the support part to the bending close to the bottom cover. The first damping part extends into the first limiting groove, and the second damping part extends into the second limiting groove.

9. The lens driving apparatus according to claim 8, wherein The first damping part has the same width parallel to the first direction and the same width parallel to the second direction, and the second damping part has the same width parallel to the first direction and the same width parallel to the second direction.

10. The lens driving apparatus according to claim 1, wherein The first circuit board is provided with a through hole penetrating through the first circuit board along the optical axis direction, the lens driving device further comprises a sensor support fixed to the first circuit board, the sensor support is fixed to the first circuit board and covers the through hole, and the image sensor is fixed to a side of the sensor support facing the opening and located in the through hole.

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