WO2020243862A1

WO2020243862A1 - Lens assembly

Info

Publication number: WO2020243862A1
Application number: PCT/CN2019/089725
Authority: WO
Inventors: 朱银龙; 黄杰; 李刚
Original assignee: 瑞声光学解决方案私人有限公司
Priority date: 2019-06-01
Filing date: 2019-06-01
Publication date: 2020-12-10
Also published as: CN110174740B; CN110174740A

Abstract

A lens assembly (10), comprising a ball assembly (15), a base (12), a lens (13) mounted on the base (12), a drive device connected between the base (12) and the lens (13), and two elastic members (16) connected between the base (12) and the lens (13). The ball assembly (15) is provided between the lens (13) and the base (12), and is used for guiding the lens (13) to slide relative to the base (12) along the optical axis direction of the lens (13). The elastic members (16) can enable the lens (13) and the base (12) to fasten the ball assembly (15) so that the drive device drives the lens (13) to move along the optical axis direction thereof. The elastic member (16) can prevent the lens (13) from deflecting to ensure the stability thereof. The imaging quality of the lens assembly (10) is good.

Description

Lens assembly

Technical field

The invention relates to the technical field of lens optical imaging, in particular to a lens assembly.

Background technique

In recent years, high-performance lens modules have been installed on portable terminals such as smart phones and tablet computers. The high-performance lens module generally has autofocus function (auto focusing). The high-performance lens module needs to move the lens along the optical axis of the lens during autofocus. In the prior art, in the auto-focusing structure, the driving device is arranged on one side of the lens, and the driving device is energized to control the movement of the lens to realize auto-focusing. However, relying on the driving device on the lens side to drive the lens may easily cause the lens Unbalance, the lens is prone to sideways flip, affecting the image quality of the lens.

Therefore, it is necessary to provide a new camera lens module to solve the above-mentioned problems.

technical problem

The object of the present invention is to provide a lens assembly with simple structure, high stability and good imaging quality.

Technical solutions

The purpose of the present invention is achieved by adopting the following technical solutions:

A lens assembly, the lens assembly comprising a ball assembly, a base, a lens mounted to the base, a driving device connected between the base and the lens, and two elastic parts connected between the base and the lens The ball assembly is arranged between the lens and the base for guiding the lens to slide relative to the base along the optical axis direction of the lens, and the elastic member enables the lens and the base The ball assembly is clamped so that the driving device drives the lens to move in the direction of the optical axis of the lens.

As an improvement, the base includes a bottom plate and a plurality of side plates extending from the bottom plate. The bottom plate and the side plates jointly form a housing space for accommodating the lens. Each elastic member includes opposite ends, and each One end of an elastic member is connected with the base, and the other end is connected with an end of the lens close to the bottom plate, and the end of the elastic member connected with the base is farther away from the driving device than the other end.

As an improved manner, the side plate includes a first side plate and a second side plate that are disposed oppositely, the optical axis direction of the lens is perpendicular to the bottom plate, and the optical axis direction of the lens is opposite to the first side plate. The side plate and the second side plate are parallel. The elastic member includes an arc-shaped body and a first fixed end and a second fixed end respectively connected to both ends of the arc-shaped body. The arc-shaped body is bent toward the lens. A fixed end is connected to the bottom plate, the second fixed end is connected to an end of the lens close to the bottom plate, and the second fixed end is close to the edge of the lens.

As an improved manner, the second fixed end of each elastic member and the arc-shaped body further include a bent portion, and the bent portion extends from the arc-shaped body in a direction away from the other elastic member. extend.

As an improvement, the two elastic members are symmetrically arranged about the geometric center of the lens.

As an improvement, the ball assembly includes a first ball and a second ball in contact with each other, and the diameter of the first ball is larger than the diameter of the second ball.

As an improvement, the lens assembly further includes a magnet and a sensor, the magnet is arranged on the lens, the sensor is arranged on the base, and the sensor is used to sense the position of the magnet and Sense the position of the lens.

As an improvement, the lens assembly further includes a housing and a circuit board, the housing and the circuit board are respectively connected to the base, the lens is located between the housing and the base, and the circuit board Located between the lens and the housing, the circuit board includes a pad, and the housing is provided with a recessed hole for exposing the pad on the circuit board.

As an improvement, the driving device includes a shape memory alloy wire. When the shape memory alloy wire is energized, the shape memory alloy wire deforms to drive the lens to move along the optical axis of the lens.

As an improvement, the shape memory alloy wire has a "V" shape, and the shape memory alloy wire includes two ends connected to the base and a V-shaped drive end located between the two ends. A driving protrusion is provided, the driving protrusion includes a V-shaped end, and the V-shaped driving end of the shape memory alloy wire is in mating contact with the V-shaped end of the lens.

As an improved manner, the lens assembly further includes a first conductive member and a second conductive member, the first conductive member is fixed on the end surface of the first side plate away from the bottom plate, and the first conductive member One end of the shape memory alloy wire is fixedly connected and electrically connected, the second conductive member is fixed on the end surface of the second side plate away from the bottom plate, the second conductive member and the shape memory alloy wire The other end of the side plate is fixedly connected and electrically connected, the height direction of the first side plate, the second side plate and the lens is parallel to the optical axis direction of the lens, and the side plate is connected to the first conductive member The height of is greater than or equal to one third of the height of the lens.

As an improvement, the lens assembly further includes a spring and a blocking member. An accommodating hole is formed on the end of the lens away from the bottom plate along the optical axis direction of the lens, the spring is arranged in the accommodating hole, and the blocking member One end of the stopper is connected to one of the side plates, the other end of the stopper extends to a position opposite to the accommodating hole, the stopper is convexly provided with a convex hull toward one side of the accommodating hole, and the convex The package card is arranged on the inner ring at one end of the spring.

Beneficial effect

Compared with the prior art, the embodiment of the present invention is that one end of each elastic member is connected to the base, the other end is connected to the end of the lens close to the bottom plate, and the end of the elastic member connected to the base is farther away from the base than the other end. The drive assembly, the elastic member make the lens and the base clamp the ball assembly, ensure that the lens moves along the optical axis of the lens, prevent the lens from deflection, ensure the stability of the lens, the imaging quality of the lens assembly is good, and the lens The component structure is simple.

One end of each elastic piece of the present invention is connected to the base, and the other end is connected to the end of the lens near the bottom plate. When the drive assembly moves the lens along the optical axis of the lens, the two elastic pieces are Drive deformation, the two elastic parts will give a leftward force to the bottom of the lens. This force is balanced with the lateral force given to the lens by the drive assembly to prevent the lens from deflection and ensure the stability of the lens. The imaging quality of the lens assembly is better. .

Description of the drawings

FIG. 1 is a schematic diagram of a three-dimensional structure of a lens assembly provided by an embodiment of the present invention;

2 is a schematic diagram of an exploded structure of a lens assembly provided by an embodiment of the present invention;

3 is a schematic diagram of a three-dimensional structure of a base provided by an embodiment of the present invention;

4 is a schematic diagram of a three-dimensional structure of a housing provided by an embodiment of the present invention;

5 is a schematic diagram of a three-dimensional structure of a lens provided by an embodiment of the present invention;

6 is a schematic diagram of a three-dimensional structure of the base and the lens provided by an embodiment of the present invention;

FIG. 7 is a schematic diagram of an enlarged structure at A in FIG. 6;

FIG. 8 is a schematic diagram of a three-dimensional structure of a lens provided by an embodiment of the present invention from another perspective;

9 is a schematic diagram of a three-dimensional structure of a ball assembly provided by an embodiment of the present invention;

10 is a schematic diagram of a three-dimensional structure of a shape memory alloy wire provided by an embodiment of the present invention;

11 is a schematic diagram of a three-dimensional structure of a shape memory alloy wire, a base, a lens, a first conductive member, and a second conductive member provided by an embodiment of the present invention;

12 is a schematic diagram of the three-dimensional structure of the base and the elastic member provided by an embodiment of the present invention;

13 is a schematic diagram of an exploded structure of a base, a lens, and an elastic member according to an embodiment of the present invention;

Figure 14 is a schematic sectional view of the structure along B-B in Figure 6;

15 is a schematic diagram of a three-dimensional structure of an elastic member provided by an embodiment of the present invention;

16 is a schematic diagram of the three-dimensional structure of the base, the lens, and the blocking member in cooperation according to an embodiment of the present invention;

FIG. 17 is a schematic diagram of a three-dimensional structure of a barrier provided by an embodiment of the present invention;

FIG. 18 is a schematic diagram of another exploded structure of a lens assembly provided by an embodiment of the present invention.

Embodiments of the invention

In order to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

The terms "first", "second", "third", "fourth", etc. (if any) in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, without having to use To describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments described herein can be implemented in an order other than the content illustrated or described herein. In addition, the terms "including" and "having" and any variations of them are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to the clearly listed Those steps or units may include other steps or units that are not clearly listed or are inherent to these processes, methods, products, or equipment.

It should be noted that the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. . Therefore, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on what can be achieved by a person of ordinary skill in the art. When the combination of technical solutions is contradictory or cannot be achieved, it should be considered that such a combination of technical solutions does not exist. , Is not within the protection scope of the present invention.

1 and 2 together, an embodiment of the present invention provides a lens assembly 10, the lens assembly 10 includes a housing 11, a base 12, a lens 13 mounted to the base 12, a shape memory alloy wire 14 , Ball assembly 15 and two elastic members 16. The housing 11 is sleeved on the base 12 and connected to the base 12, the shape memory alloy wire 14 is connected between the base 12 and the lens 13, and the two elastic members 16 are connected to the lens 13 Between the two elastic members 16 and the base 12, one end of the two elastic members 16 is respectively connected to the base 12, and the other end of the two elastic members 16 is respectively connected to the lens 13, and the ball assembly 15 is arranged between the lens 13 and the base 12 It is used to guide the lens 13 to slide relative to the base 12 along the optical axis of the lens 13, and the elastic member 16 enables the lens 13 and the base 12 to clamp the ball assembly 15 so that when the shape memory alloy wire 14 is energized, the shape memory alloy wire Deformation of the lens 14 drives the lens 13 to move along the optical axis direction of the lens 13. The two elastic members 16 are used to prevent the lens 13 from deflection relative to the optical axis direction of the lens 13 when the lens 13 moves along the optical axis direction of the lens 13. It can be understood that the shape memory alloy wire 14 may also adopt other driving devices, such as an electromagnetic driving structure, so that the driving device can drive the lens to move along the optical axis of the lens.

3, the base 12 includes a bottom plate 121 and a plurality of side plates extending from the bottom plate 121. The bottom plate 121 and the side plates together form a receiving space for accommodating the lens. Specifically, the side plates include a first side plate 122 and a second side plate. The side plate 123 and the third side plate 124, the first side plate 122 and the second side plate 123 respectively extend from the opposite sides of the bottom plate 121 toward the housing 11, and the third side plate 124 faces from the other side of the bottom plate 121 The housing 11 extends in the direction and is connected to the first side plate 122 and the second side plate 123 respectively. The bottom plate 121, the first side plate 122, the second side plate 123 and the third side plate 124 enclose the accommodation space to accommodate the lens 13. In this embodiment, the bottom plate 121, the first side plate 122, the second side plate 123 and the third side plate 124 are integrally formed. The material of the base 12 may be plastic.

The height direction of the first side plate 122 is parallel to the optical axis direction of the lens 13. A first convex portion 1221 is convexly provided on the side of the first side plate 122 facing the lens 13. The side of the first side plate 122 facing the lens 13 further defines a first clamping hole 1222.

The first convex portion 1221 is used to enclose the outer peripheral surface of the lens 13 to form a guide groove to accommodate the ball assembly 15. The shape of the first convex portion 1221 is not limited. In this embodiment, the at least one first protrusion 1221 includes a first abutting surface 1223 enclosing and forming a guide groove. The first abutting surface 1223 is used to abut the ball assembly 15, and the first abutting surface 1223 is opposite to the first abutting surface 1223. The side plate 122 is inclined. The first protrusion 1221 includes at least one. In this embodiment, there are two first protrusions 1221, one first protrusion 1221 is located at the end of the first side plate 122 away from the third side plate 124, and the other first protrusion 1221 is located near the first side plate 122. One end of the third side plate 124.

The first locking hole 1222 is used to cooperate with the positioning structure of the lens 13 to prevent the lens 13 from rotating with the optical axis of the lens 13 as the center of the circle. In this embodiment, the first locking hole 1222 penetrates the first side plate 122, and the first locking hole 1222 divides the first side plate 122 into two sections. It can be understood that the first side plate 122 can be divided into multiple sections as required.

The height direction of the second side plate 123 is parallel to the optical axis direction of the lens 13. A second convex portion 1231 protrudes from the side of the second side plate 123 facing the lens 13. The side of the second side plate 123 facing the lens 13 also defines a second locking hole 1232.

The second convex portion 1231 is used for enclosing the outer peripheral surface of the lens 13 to form a guide groove for accommodating the ball assembly 15. The shape of the second convex portion 1231 is not limited. In this embodiment, the at least one second protrusion 1231 includes a second abutting surface 1233 enclosing and forming a guide groove. The second abutting surface 1233 is used for abutting the ball assembly 15, and the second abutting surface 1233 is opposite to the second abutting surface 1233. The side plate 123 is inclined. The second protrusion 1231 includes at least one. In this embodiment, the second convex portion 1231 includes two, one second convex portion 1231 is located at the end of the second side plate 123 away from the third side plate 124, and the other second convex portion 1231 is located near the second side plate 123 One end of the third side plate 124.

The second locking hole 1232 is used to cooperate with the positioning structure of the lens 13 to prevent the lens 13 from rotating with the optical axis of the lens 13 as the center of the circle. In this embodiment, the second locking hole 1232 penetrates the second side plate 123, and the second locking hole 1232 divides the second side plate 123 into two sections. It can be understood that the second side plate 123 can be divided into multiple sections as required.

The third side plate 124 makes the structure of the base 12 more stable. When necessary, the third side plate 124 can also be equipped with other components. It can be understood that when other components are not installed on the third side plate 124, the third side plate 124 may be omitted.

The bottom plate 121 is used to connect the first side plate 122, the second side plate 123 and the third side plate 124, the bottom plate 121 is also used to carry the lens 13, and a through hole is provided in the center of the bottom plate 121 for light to pass through. A protrusion 1211 may be provided on the bottom plate 121 to pass through and fix the elastic member 16. It can be understood that the structure of the bottom plate 121 to fix the elastic member 16 is not limited, for example, the elastic member 16 can be fixed by screw connection.

Please refer to FIG. 4, the shape of the housing 11 is not limited. The housing 11 is used to provide protection and dustproof for the entire lens assembly 10, prevent dust from entering the lens assembly 10, and avoid damaging the internal parts of the housing 11. The material of the housing 11 is not limited. For example, it can be plastic or metal. When the material of the housing 11 is metal, the material of the housing 11 can be metal such as stainless steel or copper. The housing 11 is provided with a recessed hole 111, and the recessed hole 111 is used to expose the components in the housing 11 that need to be connected to the outside. The shape and position of the recessed hole 111 are not limited.

Please refer to FIGS. 5, 6 and 7 together, the lens 13 is located between the housing 11 and the base 12. The optical axis direction of the lens 13 is perpendicular to the bottom plate 121, and the optical axis direction of the lens 13 is parallel to the first side plate 122 and the second side plate 123, respectively. The height direction of the lens 13 is parallel to the optical axis direction of the lens 13. The opposite sides of the lens 13 are provided with a third convex portion 131 opposite to the first convex portion 1221 and a fourth convex portion 132 opposite to the second convex portion 1231. The opposite sides of the lens 13 are also convex oppositely. There are a first positioning portion 133 opposite to the first locking hole 1222 and a second positioning portion 134 opposite to the second locking hole 1232. The first abutting surface 1223 of the first convex portion 1221, the third convex portion 131, the first side plate 122 and the lens 13 enclose a first guide groove 135, and the second abutting surface 1233 of the second convex portion 1231 , The fourth protrusion 132, the second side plate 123 and the lens 13 are enclosed to form a second guide groove 136, and a ball assembly 15 is respectively provided in the first guide groove 135 and the second guide groove 136. The first abutting surface 1223 is inclined to the first side plate 122. The first abutting surface 1223 gives the ball assembly 15 a force perpendicular to the first abutting surface 1223. When the ball assembly 15 is pre-compressed, three When pressure is applied to the balls, the ball assembly 15 will not shake, and the lens 13 will not shake when moving along the optical axis of the lens 13. The second abutting surface 1233 is inclined to the second side plate 123. The second abutting surface 1233 gives the ball assembly 15 a force perpendicular to the second abutting surface 1233. When the ball assembly 15 is pre-compressed, three When pressure is applied to the balls, the ball assembly 15 will not shake, and the lens 13 will not shake when moving along the optical axis of the lens 13. The first positioning portion 133 is disposed in the first clamping hole 1222, and the second positioning portion 134 is disposed in the second clamping hole 1232. The lens 13 is also provided with a driving protrusion 137, and the driving protrusion 137 is used to contact and connect with the shape memory alloy wire 14.

The shape of the third protrusion 131 is not limited. In this embodiment, the lens 13 forms a pair of third abutting surfaces 1311 perpendicular to each other on the third convex portion 131 corresponding to the first abutting surface 1223. The first abutting surface 1223 is inclined with respect to each third abutting surface 1311. The number of the third protrusions 131 is equal to the number of the first protrusions 1221, so at least one first guide groove 135 is included. In this embodiment, the number of third convex portions 131 includes two. The position of each third convex portion 131 corresponds to the position of one first convex portion 1221 respectively. Each third convex portion 131 and the corresponding first convex portion 1221 jointly form a first guiding groove 135, thereby forming a total of two first guiding grooves 135. A first guide groove 135 is located at an end of the first side plate 122 close to the third side plate 124, and another first guide groove 135 is located at an end of the first side plate 122 away from the third side plate 124.

The shape of the fourth protrusion 132 is not limited. In this embodiment, the lens 13 and the fourth protrusion 132 form a pair of fourth abutting surfaces 1321 that are perpendicular to each other and corresponding to the fourth abutting surface 1321. The second abutting surface 1333 is inclinedly arranged with respect to each fourth abutting surface 1321. The number of the fourth protrusions 132 is equal to the number of the second protrusions 1231, so at least one second guide groove 136 is included. In this embodiment, the number of the fourth convex portion 132 includes two. The position of each fourth protrusion 132 corresponds to the position of a second protrusion 1231 respectively. Each fourth protrusion 132 and the corresponding second protrusion 1231 jointly form a second guide groove 136, and a total of two second guide grooves 136 are formed. A second guide groove 136 is located at an end of the second side plate 123 close to the third side plate 124, and another second guide groove 136 is located at an end of the second side plate 123 away from the third side plate 124.

The first positioning portion 133 and the third convex portion 131 are located on the same side of the lens 13. The first positioning portion 133 is offset from the center of the lens 13. The shape of the first positioning portion 133 is not limited. The shape of the side wall of the first positioning portion 133 may be consistent with the shape of the side wall of the first locking hole 1222, so that the first positioning portion 133 and the side wall of the first locking hole 1222 fit together. In this embodiment, the side wall of the first positioning portion 133 away from the third side plate 124 is attached to the side wall of the first locking hole 1222. Since the first positioning portion 133 deviates from the center of the lens 13, when the lens 13 is installed, it can play a role in preventing fools. It can be understood that by adjusting the shape or size of the first locking hole 1222, the first positioning portion 133 is close to the side wall of the third side plate 124 and the side wall of the first locking hole 1222 fits, or the first The two side walls of the positioning portion 133 are respectively attached to the side walls of the first locking hole 1222, and the first positioning portion 133 is offset from the center of the lens 13, which can also play a role in preventing fools.

The second positioning portion 134 and the fourth convex portion 132 are located on the same side of the lens 13. The second positioning portion 134 is offset from the center of the lens 13. The shape of the second positioning portion 134 is not limited. The shape of the side wall of the second positioning portion 134 may be the same as the shape of the side wall of the second locking hole 1232 so that the second positioning portion 134 and the side wall of the second locking hole 1232 fit together. In this embodiment, the side wall of the second positioning portion 134 away from the third side plate 124 is attached to the side wall of the first locking hole 1222. Since the second positioning portion 134 deviates from the center of the lens 13, when the lens 13 is installed, it can play a role in preventing fools. It can be understood that by adjusting the shape or size of the second locking hole 1232, the second positioning portion 134 is close to the side wall of the third side plate 124 and the side wall of the first locking hole 1222 fits, or the second The two side walls of the positioning portion 134 are respectively attached to the side walls of the second locking hole 1232, and the second positioning portion 134 is offset from the center of the lens 13, which can also play a role in preventing fools.

Please refer to FIG. 8, the driving protrusion 137 is located on the side of the lens 13 away from the third side plate 124. The driving protrusion 137 includes a V-shaped end 1371, and the shape memory alloy wire 14 is in mating contact with the V-shaped end 1371 of the lens 13.

Referring to FIG. 9, the ball assembly 15 includes a first ball assembly 151 and a second ball assembly 152. The sum of the number of the first ball assembly 151 and the number of the second ball assembly 152 is equal to the number of the first guide groove 135 and the second guide The sum of the number of slots 136. The first ball assembly 151 includes at least one ball assembly, and the number of the second ball assembly 152 may be zero, that is, no second ball assembly 152 is provided. The first ball assembly 151 is located in the first guide groove 135 and/or the second guide groove 136, and the second ball assembly 152 is located in the first guide groove 135 and/or the second guide groove 136. In this embodiment, the first ball assembly 151 includes two, and the second ball assembly 152 includes two. One of the first guide grooves 135 and one of the second guide grooves 136 are respectively provided with a first ball assembly 151, and the other first guide groove 135 and the other of the second guide grooves 136 are respectively provided with a second ball assembly 152. Specifically, a first ball assembly 151 is provided in the first guide groove 135 at the end of the first side plate 122 that is far away from the third side plate 124, and is located at the first ball assembly 151 of the end of the second side plate 123 away from the third side plate 124. Another first ball assembly 151 is arranged in the second guide groove 136; a second ball assembly 152 is arranged in the first guide groove 135 at one end of the first side plate 122 close to the third side plate 124, which is located close to the second side plate 123 Another second ball assembly 152 is provided in the second guide groove 136 at one end of the third side plate 124.

The first ball assembly 151 includes a first ball 1511 and a second ball 1512 in contact with each other. In this embodiment, the first ball 1511 includes at least two, and the second ball 1512 includes at least one. Each second ball 1512 is arranged between two adjacent first balls 1511, and the diameter of the first ball 1511 is larger than The diameter of the second ball 1512. The diameter ratio of the second ball 1512 and the first ball 1511 is not limited. In one embodiment, the diameter of the second ball 1512 may be 0.05-0.8 times the diameter of the first ball 1511. In this embodiment, the first ball assembly 151 includes two first balls 1511 and a second ball 1512, a second ball 1512 is sandwiched between the two first balls 1511, the second ball 1512 and the two second balls 1511 A ball 1511 touches. Since the diameter of the second ball 1512 is smaller than the diameter of the first ball 1511, the mixed arrangement of large and small balls can prevent the use of only the first ball 1511 from being unable to reach the proper length of the ball assembly 15. If two first balls 1511 are used, the two balls will occupy The total length of the first ball assembly 151 cannot meet the requirements, but the length of the first guide groove 135 is not enough to accommodate three first balls 1511 at the same time. The use of the second ball 1512 can adjust the total length of the first ball assembly 151, and can also adjust the first ball The horizontal width of the component 151. Understandably, according to needs, a plurality of second rolling balls 1512 may also be arranged between the two first rolling balls 1511.

The second ball assembly 152 includes at least one third ball 1521, and the diameter of the third ball 1521 is not limited. In this embodiment, the second ball assembly 152 includes a third ball 1521, and the diameter of the third ball 1521 may be equal to the diameter of the first ball 1511. If necessary, the second ball assembly 152 can be omitted. Only two first ball assemblies 151 are provided, which does not affect the first ball assembly 151 to guide the lens 13 to slide relative to the base 12 along the optical axis direction of the lens 13.

10, the shape memory alloy wire 14 preferably has a "V" shape. The shape memory alloy wire 14 includes two ends 141 connected to the base 12 and a V-shaped drive end 142 located between the two ends 141. The shape memory alloy wire The V-shaped drive end 142 of 14 is in mating contact with the V-shaped end 1371 of the lens 13. The plane of the shape memory alloy wire 14 is parallel to the optical axis direction of the lens 13. When the shape memory alloy wire 14 is heated by the passing current, the shape memory alloy wire 14 shrinks and deforms to generate deformation force. Since the two ends 141 of the shape memory alloy wire 14 are fixedly connected to the base 12, the shape memory alloy wire 14 generates The deforming force is applied to the driving protrusion 137 of the lens 13 through the V-shaped driving end 142, and the lens 13 is guided along the optical axis of the lens 13 under the guidance of the first ball assembly 151 (or the first ball assembly 151 and the second ball assembly 152). The direction moves relative to the base 12 to adjust the focal length of the lens 13. By adjusting the magnitude of the current passing through the shape memory alloy wire 14, the amount of deformation of the shape memory alloy wire 14 can be adjusted, thereby adjusting the moving distance of the lens 13. The material of the shape memory alloy wire 14 is not limited. In this embodiment, the material of the shape memory alloy wire 14 may include Nitinol, and the diameter of the shape memory alloy wire 14 is preferably 10 μm-50 μm. It can be understood that the two ends 141 of the shape memory alloy wire 14 can also be fixed on the lens, and the V-shaped drive end 142 of the shape memory alloy wire 14 and the base 12 are in contact with each other to drive the lens to move along the optical axis of the lens.

11, the lens assembly 10 further includes a first conductive member 17 and a second conductive member 18. The first conductive member 17 is fixed on the end surface of the first side plate 122 away from the bottom plate 121, and the first conductive member 17 and One end 141 of the shape memory alloy wire 14 is fixedly connected and electrically connected, the second conductive member 18 is fixed on the end surface of the second side plate 123 away from the bottom plate 121, the second conductive member 18 and the shape memory alloy wire The other end 141 of the 14 is fixedly connected and electrically connected, the height h1 of the connection between the first side plate 122 and the first conductive member 17 is greater than or equal to one third of the height of the lens 13, and the second side plate 123 is connected to the second conductive member 17 The height h2 of the joint of the piece 18 is greater than or equal to one third of the height of the lens 13. The height of the connection between the first conductive member 17 and the second conductive member 18 and the shape memory alloy wire 14 is substantially equal to the height of the first side plate 122, and the height of the connection between the first side plate 122 and the first conductive member 17 is increased. The height of the connection between the two side plates 123 and the second conductive member 18 can reduce the height of the first conductive member 17 and the second conductive member 18, thereby increasing the strength of the first conductive member 17 and the second conductive member 18, so that the first The conductive member 17 and the second conductive member 18 are not easily deformed after being stressed. In this embodiment, the first conductive member 17 and the second conductive member 18 may be conductive terminals or wire binding clips. The materials of the first conductive member 17 and the second conductive member 18 are both conductive metal.

12, 13 and 14, each elastic member 16 includes opposite ends, one end of each elastic member 16 is connected to the bottom plate 121 of the base 12, and the other end is connected to the end of the lens 13 close to the bottom plate 121 . In this embodiment, the two elastic members 16 are symmetrically arranged about the geometric center of the lens 13. One end of the elastic member 16 connected to the bottom plate 121 of the base 12 is farther away from the shape memory alloy wire 14 than the other end. When the elastic member 16 is installed, the elastic member 16 is connected to the bottom plate 121 and the lens 13, and when the shape memory alloy wire 14 is not energized, the elastic member 16 is pre-deformed and deformed. The elastic member 16 provides lateral pressure to the lens 13, the ball assembly 15 and the base. The seat 12 is pressed tightly to generate pre-pressure on the three surfaces of the ball assembly 15 so that the ball assembly will not shake. Since the shape memory alloy wire 14 is located on the side of the lens 13, when the shape memory alloy wire 14 is deformed and the lens 13 moves along the optical axis direction of the lens 13, an upward force F1 is given to the lens 13 and a counterclockwise direction is generated. The two elastic members 16 are driven by the lens 13 to deform. The two elastic members 16 will give the bottom of the lens 13 a force F3 toward the bottom plate 121 and a force F4 toward the center of the lens 13. The two elastic members 16 give the lens 13 The force and the counterclockwise torque balance F2. At the same time, the two elastic members 16 will drive the bottom of the lens 13, the first ball assembly 151, and the side plate of the base 12 in close contact, thereby preventing the lens 13 from deflection during movement and ensuring The stability of the lens 13 is improved.

In this embodiment, the structures of the two elastic members 16 are the same, and this embodiment only describes the structure of one elastic member 16.

Referring to FIG. 15, the elastic member 16 includes an arc-shaped body 161 and a first fixed end 162 and a second fixed end 163 respectively connected to both ends of the arc-shaped body 161. The first fixed end 161 is connected to the bottom plate 121, and the second fixed end 162 Connected to the end of the lens 13 close to the bottom plate 121, the second fixed end 163 is close to the edge of the lens, and the distance from the second fixed end 163 to the edge of the lens 13 is less than a quarter of the length of the lens 13 perpendicular to the length direction. The second fixed end 163 of each elastic member 16 and the arc-shaped body 161 further include a bending portion 164 extending from the arc-shaped body 161 in a direction away from the other elastic member 16. The bent portion 164 has a "U" shape.

The arc-shaped body 161 is curved toward the lens 13. The width and thickness of the arc-shaped body are not limited, and the width and thickness of the arc-shaped body can be set reasonably according to the force required to provide when the elastic member 16 is deformed. The arc-shaped body 161 has an arc shape, so that the arc-shaped body 161 can balance the counterclockwise torque of the shape memory alloy wire 14 to the lens 13 with a small force.

A first mounting hole 1621 is defined on the first fixing end 162, and the first mounting hole 1621 is used to fix the first fixing end 162 on the bottom plate 121. The first mounting hole 1621 may be a through hole. The first mounting hole 1621 cooperates with the protrusion 1211 on the bottom plate 121 to fix the first fixing end 162.

A second mounting hole 1631 is defined on the second fixing end 163, and the second mounting hole 1631 is used to fix the second fixing end 163 on the lens 13. The second mounting hole 1631 may be a through hole.

Referring to FIG. 16, the lens assembly 10 further includes a plurality of blocking members 19 respectively located at one end of the first guide groove 135 and the second guide groove 136 away from the bottom plate 121. Specifically, one end of the blocking member 19 is connected to the first side plate 122 or the second side plate 123, and the other end of the blocking member 19 is located at an end of the first guide groove 135 or the second guide groove 136 away from the bottom plate 121. The blocking member 19 can prevent the ball assembly 15 in the first guide groove 135 or the second guide groove 136 from rolling out. The position where the blocking member 19 is fixed on the first side plate 122 or the second side plate 123 is not limited, as long as it can block the ball assembly 15.

The lens assembly 10 further includes a plurality of resilient members (not shown). A plurality of accommodating holes 20 are defined on the end of the lens 13 away from the bottom plate 121 along the optical axis direction of the lens 13, and the accommodating holes 20 are blind holes. The resilient member is arranged in the corresponding accommodating hole 20. Each accommodating hole 20 is provided with a resilient member. When one end of a blocking member 19 is connected to the first side plate 122 or the second side plate 123, the blocking member The other end of 19 extends to a position opposite to the receiving hole 20. Specifically, in this embodiment, when one end of the stopper 19 is located at the end of the first guide groove 135 or the second guide groove 136 away from the bottom plate 121, one end of the stopper 19 is also located at an accommodating hole 20 away from the bottom plate 121. One end of the resilient member is fixed to the blocking member 19 at one end away from the lens 13. The blocking member 19 can simultaneously prevent the resilient member from falling out of the receiving hole 20 and prevent the ball assembly 15 from rolling out of the ball assembly 15 in the first guide groove 135 or the second guide groove 136. In this embodiment, the accommodating hole 20 includes two, the resilient member includes two, and an accommodating hole 20 is provided under the blocking member 19 provided at one end of the first guide groove 135 away from the third side plate 124, Another accommodating hole 20 is provided under the blocking member 19 provided at one end of the second guide groove 136 of the third side plate 124. The two resilient members are preferably coil springs and are respectively located in one accommodating hole 20. The resilient member is pre-compressed when installed in the receiving hole 20. When the shape memory alloy wire 14 is not energized, the resilient member can also restore force to the lens 13 and press the lens 13 on the bottom plate 121 of the base 12. When the shape memory alloy wire 14 is energized, the resilient member also provides a restoring force to the lens when the lens 13 moves.

Please refer to FIG. 17, a convex hull is provided on one side of the blocking member 19 close to the accommodating hole 20, and the convex hull is used to provide the resilient member for contact connection. The resilient member includes a spring, and one end of the spring close to the convex hull is clamped on the convex hull.

Referring to FIG. 18, the lens assembly 10 further includes a magnet 21 and a sensor (not shown). The magnet is arranged on the side of the lens 13 near the third side plate 124, the sensor is arranged on the base 12, and the sensor is used for The position of the magnet is sensed to sense the position of the lens 13. When the magnet is connected to the lens 13, a slot can be formed on the lens 13 to accommodate the magnet. The sensor is preferably a Hall sensor.

The lens assembly 10 also includes a circuit board 22, which is connected to the third side plate 124 of the base 12. The circuit board 22 is located on the side of the third side plate 124 away from the lens 13, and the circuit board 22 is also located between the lens 13 and the housing 11. between. The circuit board 22 is electrically connected to the sensor. The circuit board 22 includes a pad 221. The recessed hole 111 provided on the housing 11 is used to expose the pad 221 on the circuit board, which can prevent the circuit board from being short-circuited.

The above are only the embodiments of the present invention. It should be pointed out here that for those of ordinary skill in the art, improvements can be made without departing from the inventive concept of the present invention, but these all belong to the present invention. The scope of protection.

Claims

A lens assembly, characterized in that: the lens assembly includes a ball assembly, a base, a lens mounted to the base, a driving device connected between the base and the lens, and two lenses connected between the base and the lens. An elastic member, the ball assembly is arranged between the lens and the base for guiding the lens to slide relative to the base along the optical axis of the lens, and the elastic member can make the lens and the base The base clamps the ball assembly, so that the driving device drives the lens to move in the direction of the optical axis of the lens.
The lens assembly according to claim 1, wherein the base includes a bottom plate and a plurality of side plates extending from the bottom plate, and the bottom plate and the side plates together form a receiving space for accommodating the lens, each of which is flexible The element includes opposite ends. One end of each elastic element is connected to the base, and the other end is connected to the end of the lens near the bottom plate. The end of the elastic element connected to the base is smaller than the other end. Farther away from the driving device.
The lens assembly according to claim 2, wherein the side plate comprises a first side plate and a second side plate which are arranged oppositely, the optical axis direction of the lens is perpendicular to the bottom plate, and the light of the lens The axial directions are respectively parallel to the first side plate and the second side plate. The elastic member includes an arc-shaped body and a first fixed end and a second fixed end respectively connected to both ends of the arc-shaped body, and the arc-shaped body faces The lens is bent, the first fixed end is connected to the bottom plate, the second fixed end is connected to the end of the lens close to the bottom plate, and the second fixed end is close to the edge of the lens.
4. The lens assembly of claim 3, wherein the second fixed end of each elastic member and the arc-shaped body further comprise a bent portion, and the bent portion is formed from the arc-shaped body. It extends in the direction away from the other elastic member.
4. The lens assembly according to any one of claims 1 to 4, wherein the two elastic members are symmetrically arranged about the geometric center of the lens.
4. The lens assembly of claim 1, wherein the ball assembly includes a first ball and a second ball in contact with each other, and the diameter of the first ball is larger than the diameter of the second ball.
The lens assembly of claim 1, wherein the lens assembly further comprises a magnet and a sensor, the magnet is arranged on the lens, the sensor is arranged on the base, and the sensor is used for The position of the magnet is sensed to sense the position of the lens.
The lens assembly of claim 1, wherein the lens assembly further comprises a housing and a circuit board, the housing and the circuit board are respectively connected to the base, and the lens is located between the housing and the base. Between the seats, the circuit board is located between the lens and the housing, the circuit board includes a pad, and the housing is provided with recessed holes, and the recessed holes are used to expose the pads on the circuit board .
4. The lens assembly of claim 3, wherein the driving device comprises a shape memory alloy wire, and when the shape memory alloy wire is energized, the shape memory alloy wire is deformed to drive the lens along the optical axis of the lens Move in direction.
9. The lens assembly of claim 9, wherein the shape memory alloy wire is in a "V" shape, and the shape memory alloy wire includes two ends connected to the base and a V located between the two ends. A driving end, the lens is provided with a driving protrusion, the driving protrusion includes a V-shaped end, and the V-shaped driving end of the shape memory alloy wire is in mating contact with the V-shaped end of the lens.
8. The lens assembly of claim 9, wherein the lens assembly further comprises a first conductive member and a second conductive member, the first conductive member is fixed on the first side plate away from the bottom plate On the end surface, the first conductive element is fixedly connected and electrically connected to one end of the shape memory alloy wire, the second conductive element is fixed on the end surface of the second side plate away from the bottom plate, and the first The two conductive parts are fixedly connected and electrically connected to the other end of the shape memory alloy wire. The height direction of the first side plate, the second side plate and the lens is parallel to the optical axis direction of the lens, and the side plate is connected to the The height of the joint of the first conductive element is greater than or equal to one third of the height of the lens.
The lens assembly according to claim 2, characterized in that: the lens assembly further comprises a spring and a blocking member, an end of the lens away from the bottom plate is provided with a receiving hole along the optical axis direction of the lens, and the spring is arranged in the container In the accommodating hole, one end of the blocking member is connected to one of the side plates, the other end of the blocking member extends to a position opposite to the accommodating hole, and the blocking member is convex toward one side of the accommodating hole A convex hull is provided, and the convex hull is clamped on the inner ring at one end of the spring.