WO2020258093A1

WO2020258093A1 - Lens assembly

Info

Publication number: WO2020258093A1
Application number: PCT/CN2019/093083
Authority: WO
Inventors: 朱银龙; 李刚; 卢继亮; 李林珍
Original assignee: 瑞声光学解决方案私人有限公司
Priority date: 2019-06-26
Filing date: 2019-06-26
Publication date: 2020-12-30
Also published as: CN110286461B; CN110286461A

Abstract

A lens assembly (10), comprising a base (11), a lens seat (12) for mounting a lens, an elastic member (13) connected between the base (11) and the lens seat (12), and a driving device (14) connected between the base (11) and the lens seat (12); the base (11) has an inner cavity (111), the elastic member (13) encloses to form an accommodating space (131), and the elastic member (13) is located on the inner cavity (111) of the base (11) and enables the lens seat (12) to be suspended in the accommodating space (131) enclosed and formed by the elastic member (13); and the driving device (14) is used to drive the lens seat (12) to move along a direction perpendicular to the optical axis of the lens. The elastic member (13) functions to provide the base (11) with a restoring force perpendicular to the optical axis of the lens, and simultaneously functions to electrically connect the lens seat (12) and a base circuit board (116), which reduces the assembly process of the lens assembly (10), improves assembly efficiency, and effectively increases the drop deformation resistance capabilities of the lens assembly (10), thereby improving the reliability thereof.

Description

Lens assembly

Technical field

The invention relates to 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). When the high-performance lens module is in autofocus, the related technology lens components not only need to meet the AF autofocus function, but also need to meet the OIS anti-shake function, so it needs to be equipped with an AF device and an OIS anti-shake device.

However, the related art lens assembly needs to add an additional support structure to support the anti-shake device for OIS anti-shake function in order to achieve the above-mentioned purpose, and the assembly process of the support structure is complicated, which affects the yield and poor drop resistance performance. reliability.

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

technical problem

The purpose of the present invention is to provide a lens assembly with simple structure, high assembly efficiency and high reliability.

Technical solutions

The technical scheme of the present invention is as follows:

A lens assembly, comprising a base, a lens holder for installing a lens, an elastic member connected between the base and the lens holder, and a driving device connected between the base and the lens holder The base has an inner cavity, the elastic member encloses a receiving space, the elastic member is located in the inner cavity of the base, and the lens holder is suspended in the receiving space enclosed by the elastic member, The driving device is used for driving the lens holder to move in a direction perpendicular to the optical axis of the lens.

As an improvement, the lens holder and the base respectively include a circuit board, and the elastic member is provided with a first conductive end and a second conductive end that are connected to each other, and the first conductive end and the The circuit board of the lens holder is electrically connected, and the second conductive end is electrically connected with the circuit board of the base.

As an improved way, the lens mount and the base each include a circuit board, the elastic member includes two sets of L-shaped spring plates, the two sets of L-shaped spring plates enclose the containing space, and each group has The L-shaped spring leaf includes a first spring leaf and a second spring leaf, the second spring leaf is located outside the first spring leaf, the first spring leaf and the second spring leaf are both provided with mutual conduction The first pin and the second pin are electrically connected to the circuit board of the lens holder, and the second pin is electrically connected to the circuit board of the base.

As an improvement, the two sets of L-shaped spring plates are symmetrical about the geometric center of the lens assembly.

As an improvement, one end of the first spring piece and the second spring piece both extend in a direction parallel to the optical axis of the lens and bend inward to form the first pin, and the first spring piece And the other end of the second spring piece both extend in a direction parallel to the optical axis of the lens and bend outward to form the second pin.

As an improvement, the lens mount is provided with a first protrusion, the first pin is engaged with the first protrusion, the base is provided with a second protrusion, and the first protrusion The two pins are clamped on the second protrusion.

As an improvement, the driving device includes several groups of shape memory alloy wires. When any group of the shape memory alloy wires is energized, the group of shape memory alloy wires is deformed to drive the lens mount along a line perpendicular to the lens. Move the optical axis direction.

As an improvement, the base is square and includes four side walls. The adjacent side walls are perpendicular to each other. When any group of the shape memory alloy wires is energized, the group of shape memory alloy wires deform to The lens holder is driven to move toward one of the side walls.

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

As an improvement, a blocking piece is provided on the driving convex portion of the lens holder to prevent the shape memory alloy wire from slipping off. .

The beneficial effects of the present invention are:

Compared with the prior art, the lens assembly of the present invention includes a base, a lens mount, an elastic member, and a driving device. When the lens mounted on the lens mount is automatically focused, the driving device is activated synchronously to drive the lens mount perpendicular to the lens. The optical axis of the lens module moves in the direction of the optical axis, so the lens module can realize the OIS anti-shake function at the same time during autofocus; the elastic part is located in the inner cavity of the base, and the elastic part is connected between the base and the lens mount, and the lens is made by the elastic part The seat is suspended in the accommodating space enclosed by the elastic member, so the elastic member not only provides the base with a restoring force perpendicular to the optical axis of the lens, but also functions as an electrical connection between the lens base and the base circuit board , The assembly process of the lens assembly is reduced, the assembly efficiency is improved, and the drop deformation resistance of the lens assembly is effectively increased, thereby improving its reliability.

Beneficial effect

Compared with the prior art, the elastic member of the present invention is composed of two sets of L-shaped spring leaves, and each set of L-shaped spring leaves includes a first spring plate and a second spring plate. Therefore, the elastic member can be modularized, thereby improving production efficiency. At the same time, when the first spring sheet or the second spring sheet is partially damaged, only the corresponding spring sheet can be replaced, which can save costs, and the first spring sheet and the second spring sheet are independent and can be connected to the lens holder Different lines between the circuit board and the circuit board of the base.

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;

FIG. 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 the three-dimensional structure of the lens assembly provided by an embodiment of the present invention when the base circuit board is not installed.

4 is a top view of the lens assembly provided by an embodiment of the present invention when the base circuit board is not installed.

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

6 is a schematic diagram of a three-dimensional structure of a lens mount of a lens assembly provided by an embodiment of the present invention.

FIG. 7 is a schematic diagram of a three-dimensional structure of an elastic member of a lens assembly provided by an embodiment of the present invention.

FIG. 8 is a schematic diagram of a three-dimensional structure of a shape memory alloy wire 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 following further describes the present invention in detail 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 this combination of technical solutions does not exist , Is not within the protection scope of the present invention.

Please refer to FIGS. 1 to 3 together. This embodiment provides a lens assembly 10, which includes a base 11, a lens mount 12 for mounting a lens, and an elasticity connected between the base 11 and the lens mount 12 The member 13 and the driving device 14 connected between the base 11 and the lens holder 12, the base 11 has an inner cavity 111, the elastic member 13 is located in the inner cavity 111 of the base 11, and the elastic member 13 encloses a receiving space 131 (see FIG. 7) The lens holder 12 is suspended in the accommodating space 131 enclosed by the elastic member 13, and the driving device 14 is used to drive the lens holder 12 to move along the direction perpendicular to the optical axis of the lens.

In this embodiment, the lens assembly 10 has a square structure, the direction parallel to one side of the square structure is defined as the x-axis direction, the direction parallel to the other side of the square structure is defined as the y-axis direction, and the y-axis direction and the x-axis direction are perpendicular to each other. All are perpendicular to the optical axis of the lens. In this embodiment, the base 11 is square and includes four side walls. The driving device 14 includes four sets of shape memory alloy wires 14, which are respectively connected to the four sides of the lens mount 12 and the base 11. wall. When the lens mounted on the lens mount 12 is automatically focused, the corresponding set of shape memory alloy wires 14 are simultaneously energized, and the set of shape memory alloy wires 14 are deformed to drive the lens mount 12 to move in the y-axis or x-axis direction, so the lens mold When the group is in autofocus, it can realize OIS anti-shake function at the same time. It can be understood that the driving device 14 may also adopt other driving structures, such as an electromagnetic driving structure, as long as it can drive the lens holder 12 to move in a direction perpendicular to the optical axis of the lens.

2 to 5, the base 11 includes a first side wall 112, a second side wall 113, a third side wall 114, and a fourth side wall 115 that are adjacent to each other in sequence, the first side wall 112 and the second side wall 113, the third side wall 114 and the fourth side wall 115 can be integrally formed, and the adjacent side walls are perpendicular to each other to form the above-mentioned inner cavity 111. The ray emitted from the first side wall 112 with the optical axis of the lens is +y Axis, the ray emitted from the third side wall 114 with the optical axis of the lens is the -y axis, the ray emitted from the second side wall 113 with the optical axis of the lens is the +x axis, and the ray from the optical axis of the lens is fourth The ray emitted from the side wall 115 is the -x axis. Specifically, when the shape memory alloy wire 14 connected between the first side wall 112 and the lens mount 12 is energized, the lens mount 12 is driven to shift along the +y axis toward the first side wall 112; when connected to the second side When the shape memory alloy wire 14 between the wall 113 and the lens mount 12 is energized, the lens mount 12 is driven to be offset along the +x axis toward the second side wall 113; when connected between the third side wall 114 and the lens mount 12 When the shape memory alloy wire 14 is energized, the lens holder 12 is driven to shift along the -y axis toward the third side wall 114; when the shape memory alloy wire 14 connected between the fourth side wall 115 and the lens holder 12 is energized, the lens The seat 12 is driven to be offset toward the fourth side wall 115 along the -x axis.

A circuit board 116 is installed on the base 11 for supplying power to the driving device 14. An axial end surface of the first side wall 112 facing the circuit board 116 and an axial end surface of the third side wall 113 facing the circuit board 115 are respectively provided There are second protrusions 117 for fixing corresponding ends of the elastic member 13, and fixing terminals 118 are provided on the end faces of the four side walls facing the circuit board 116 for fixing the four groups of shape memory alloys. The material of the base 11 may be plastic. The shape of the second protrusion 117 and the fixed terminal 118 is not limited, and the shape of the base is not limited to a square shape.

Optionally, a metal cover plate 119 is also installed on the base 11 to cover the circuit board 116 of the base 11 for protecting the circuit board 116 of the base 11.

Referring to FIG. 6, the lens mount 12 is preferably square and includes four side plates 121 and a cover plate 122. The four side plates 121 and the cover plate 122 can be integrally formed. A circuit board 123 is installed on the cover plate 122 for facing the lens The auto-focus driving structure of the seat 12 is powered, and the cover plate 122 is provided with recesses 1221 on the upper surfaces of the two diagonal ends of the cover plate 122. The recesses 1221 are provided with a plurality of first protrusions 1222 for fixing the elastic member 13 Four sets of driving protrusions 1223 are evenly distributed on the cover 122, and each set of driving protrusions 1223 is arranged on the center line of the length or width direction of the lens holder 12. Each set of driving protrusions 1223 includes an arc Preferably, it is a V-shaped or U-shaped end 12231. The arc-shaped end 12231 is in mating contact with the shape memory alloy wire 14. Each group of driving protrusions 1223 is engaged with a stopper 1224 (see Figure 2) to prevent the shape memory alloy The line 14 slips off, and the baffle 1224 can be made of steel. The material of the lens mount 12 may be plastic. The shape of the first protrusion 1222 is not limited, and the shape of the lens mount 12 is not limited to a square shape.

Please refer to Figure 3, Figure 4 and Figure 7, the elastic member 13 includes two sets of L-shaped spring leaves, the two sets of L-shaped spring leaves are arranged in the circumferential direction, and each set of L-shaped spring leaves includes an extension along the x-axis direction and along the y The axial extension, the end of the extension of each group of spring leaves in the x-axis direction is close to the end of the other group of extensions in the axial direction, thereby enclosing the above-mentioned accommodation space 131, the two sets of L-shaped springs are mutually exclusive Each group of L-shaped spring leaves includes a first spring plate 132 and a second spring plate 133. The second spring plate 133 is located outside the first spring plate 132. The first spring plate 132 and the second spring plate 133 do not contact each other. One end of the spring piece 132 and the second spring piece 133 both extend in the direction parallel to the optical axis of the lens and bend inward to form a first pin 1321, and the first pin 1321 is engaged with the first protrusion 1222 of the lens mount The other ends of the first spring piece 132 and the second spring piece 133 extend parallel to the optical axis of the lens and are bent outward to form a second pin 1322. The two pins 1322 are clamped on the second protrusion 117 of the base, and are welded and fixed with the circuit board 116 of the base. The first pin 1321 and the second pin 1322 are connected to each other.

The two sets of L-shaped springs have the following functions: one, to provide the base 11 with a restoring force perpendicular to the optical axis of the lens (that is, the +x or -x or +y or -y direction); two, through the first pin 1321 and the second pin 1322 are connected to the lens holder 12 and the base 11, so that the lens holder 12 is suspended in the receiving space 131 surrounded by two sets of L-shaped springs. There is no need to provide an additional support structure to support the lens holder 12, which reduces The assembly process of the lens assembly 10 has high assembly efficiency and yield, and effectively increases the anti-drop deformation ability of the lens assembly, thereby improving its reliability; third, the first spring plate 132 and the second spring plate 133 do not contact each other, first A pin 1321 and a second pin 1322 are respectively electrically connected to the circuit board of the lens holder 12 and the circuit board 116 of the base, so that power can be supplied to the circuit board of the lens holder 12 through the first spring piece 132 and the second spring piece 133 .

Optionally, the two sets of L-shaped spring plates are symmetrical about the geometric center of the lens assembly 10.

Optionally, the first spring leaf 132 and the second spring leaf 133 are made of an elastic alloy.

In addition, since the elastic member 13 is composed of two sets of L-shaped spring leaves, and each set of L-shaped spring leaves includes a first spring plate 132 and a second spring plate 133, the elastic member 13 can be produced in a modular manner, thereby improving production efficiency. When the first spring leaf 132 or the second spring leaf 133 is partially damaged, only the corresponding spring leaf can be replaced, which can save cost.

Please refer to Figures 3, 4 and 8, each group of shape memory alloy wires 14 is in a "V" shape, and each group of shape memory alloy wires 14 includes two ends 141 connected to the base 11 and an arc between the two ends 141 Type drive end 142. The two ends 141 of the shape memory alloy wire are connected with a wire binding clip 143. The wire binding clip 143 is clamped on the fixed terminal 118 on the base, thereby fixing the shape memory alloy wire on the base 11. The arc-shaped drive end 142 of the alloy wire is in mating contact with the arc-shaped end 12231 on the lens mount. When any group of shape memory alloy wires 14 is energized, the group of shape memory alloy wires 14 deform to drive the lens mount 12 along +y Or -y or +x or -x direction to move, so as to realize the automatic anti-shake of the lens.

By adjusting the magnitude of the current passing through the group of shape memory alloy wires 14, the amount of deformation of the group of shape memory alloy wires 14 can be adjusted, thereby adjusting the moving distance of the lens mount 12 in the vertical optical axis plane. 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 can also be fixed on the lens holder 12, and the arc-shaped drive end 142 of the shape memory alloy wire is in contact with the base 11, and can drive the lens holder 12 along +y or -y or Move in +x or -x direction.

Optionally, the circuit board 116 on the base is provided with four groups of positive and negative electrodes, and each group of positive and negative electrodes are electrically connected to the wire binding clips 143 of each group of shape memory alloy wires 14 to provide each group of shape memory alloy wires 14 power supply.

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.

To

Claims

A lens assembly, which is characterized in that it comprises a base, a lens holder for mounting a lens, an elastic member connected between the base and the lens holder, and a connection between the base and the lens holder. The base has an inner cavity, the elastic member encloses a accommodating space, the elastic member is located in the inner cavity of the base, and the lens holder is suspended in the elastic member to form The driving device is used to drive the lens holder to move in a direction perpendicular to the optical axis of the lens.
The lens assembly according to claim 1, wherein the lens holder and the base respectively comprise a circuit board, and the elastic member is provided with a first conductive end and a second conductive end that are connected to each other, so The first conductive end is electrically connected with the circuit board of the lens holder, and the second conductive end is electrically connected with the circuit board of the base.
The lens assembly according to claim 1, wherein the lens holder and the base each include a circuit board, the elastic member includes two sets of L-shaped spring plates, and the two sets of L-shaped spring plates surround In the accommodation space, each group of the L-shaped spring leaves includes a first spring plate and a second spring plate, the second spring plate is located outside the first spring plate, the first spring plate and the second spring plate The spring plates are each provided with a first pin and a second pin that are connected to each other, the first pin is electrically connected to the circuit board of the lens holder, and the second pin is connected to the circuit board of the base Electric connection.
The lens assembly according to claim 1, wherein the lens holder and the base each include a circuit board, the elastic member includes two sets of L-shaped spring plates, and the two sets of L-shaped spring plates surround In the accommodation space, each group of the L-shaped spring leaves includes a first spring plate and a second spring plate, the second spring plate is located outside the first spring plate, the first spring plate and the second spring plate The spring plates are each provided with a first pin and a second pin that are connected to each other, the first pin is electrically connected to the circuit board of the lens holder, and the second pin is connected to the circuit board of the base Electric connection.
The lens assembly of claim 3, wherein one ends of the first spring piece and the second spring piece both extend in a direction parallel to the optical axis of the lens and are bent inward to form the first guide The other ends of the first spring sheet and the second spring sheet both extend in a direction parallel to the optical axis of the lens and are bent outward to form the second pin.
The lens assembly according to claim 3, wherein a first protrusion is provided on the lens mount, the first pin is engaged with the first protrusion, and the base is provided with The second protrusion, the second pin is engaged with the second protrusion.
The lens assembly according to any one of claims 1-6, wherein the driving device comprises a plurality of groups of shape memory alloy wires, and when any group of the shape memory alloy wires is energized, the group of shape memory alloy wires Deformation occurs to drive the lens mount to move in a direction perpendicular to the optical axis of the lens.
The lens assembly according to claim 7, wherein the base is square and includes four side walls, and adjacent side walls are perpendicular to each other. When any group of the shape memory alloy wires is energized, the The group of shape memory alloy wires are deformed to drive the lens holder to move toward one of the side walls.
The lens assembly according to claim 7, wherein the base is square and includes four side walls, and adjacent side walls are perpendicular to each other. When any group of the shape memory alloy wires is energized, the The group of shape memory alloy wires are deformed to drive the lens holder to move toward one of the side walls.
9. The lens assembly according to claim 9, wherein the driving convex portion of the lens holder is provided with a baffle to prevent the shape memory alloy wire from slipping off.