A lens module and an electronic device using it

Abstract

A lens module and an electronic device using the same are disclosed. The lens module includes a first lens assembly, a second lens assembly, a mounting sleeve, and a piezoelectric unit. The mounting sleeve is made of a stretchable material. The piezoelectric unit is arranged on the mounting sleeve. The piezoelectric effect of the piezoelectric unit causes deformation, which in turn causes the mounting sleeve to deform, allowing the first lens assembly to move along a slide rail perpendicular to the axial direction to achieve image stabilization, and / or allowing the second lens assembly to rotate along a threaded path along the axial direction to achieve zoom. The lens module of this invention uses a single piezoelectric module to independently control the zoom or image stabilization of the lens module, achieving precise and efficient control.

Description

Technical Field

[0001] This invention relates to the field of optoelectronic devices, and more specifically to a lens module and an electronic device using the same. Background Technology

[0002] Lenses are the most commonly used optical imaging devices in daily life. As people's requirements for image quality continue to increase, zoom and image stabilization play an important role in obtaining clear and accurate images. Each upgrade in zoom and image stabilization technology can significantly improve the quality of input images and adapt to the different needs of more complex scenes.

[0003] Existing lenses have limited stability in their optical zoom and image stabilization, limiting the accuracy of zoom and / or image stabilization. Furthermore, wide-range zoom functions require a large amount of space to be preset along the lens axis, which is not conducive to the increasingly thinner overall requirements of the camera body. Summary of the Invention

[0004] The purpose of this invention is to provide a piezoelectric-driven zoom and image stabilization lens module and an electronic device using the same. The piezoelectric module enables independent control of the zoom and image stabilization of the lens module, thereby improving the stability and accuracy of the zoom and / or image stabilization.

[0005] Firstly, a lens module is provided, including:

[0006] First-lens assembly;

[0007] Second lens assembly;

[0008] A mounting sleeve, made of a stretchable material, has a through-hole for securing the first lens assembly and the second lens assembly; and

[0009] A piezoelectric unit, fixedly connected to the mounting sleeve, is configured to receive an electrical signal to generate deformation in order to drive the mounting sleeve to generate the desired deformation.

[0010] The deformation of the mounting sleeve causes the second lens assembly to move axially relative to the mounting sleeve, and / or causes the first lens assembly to move relative to the mounting sleeve in a plane perpendicular to the axial direction of the mounting sleeve.

[0011] Furthermore, the lens module also includes:

[0012] At least one first slide rail is disposed on the wall of the bore of the mounting sleeve, and the first slide rail is arranged in a direction perpendicular to the axial direction of the mounting sleeve;

[0013] The first lens assembly has a first guide rail corresponding to the first slide rail, and the first guide rail is slidably connected to the corresponding first slide rail.

[0014] Furthermore, the lens module also includes:

[0015] A stabilizing bracket is fixedly connected to the wall of the bore of the mounting sleeve. The stabilizing bracket is provided with at least one second slide rail, which is arranged in a direction perpendicular to the axial direction of the mounting sleeve.

[0016] The first lens assembly has a second guide rail corresponding to the second slide rail, and the second guide rail is slidably connected to the corresponding second slide rail.

[0017] Furthermore, the lens module also includes:

[0018] A stabilizing bracket is fixedly connected to the wall of the bore of the mounting sleeve. The stabilizing bracket is provided with at least one second slide rail, which is arranged in a direction perpendicular to the axial direction of the mounting sleeve.

[0019] The first lens assembly has a second guide rail corresponding to the second slide rail, and the second guide rail is slidably connected to the corresponding second slide rail;

[0020] The second slide rail and the first slide rail are perpendicular to each other.

[0021] Furthermore, the second guide rail is disposed at the bottom of the first lens assembly;

[0022] The second slide rail is positioned on the top of the stabilizing bracket, opposite to the second guide rail.

[0023] Furthermore, the stabilizing bracket has at least one locking claw, and the mounting sleeve has a locking groove corresponding to the locking claw;

[0024] The stabilizing bracket is connected to the mounting sleeve by engaging the fastening claws into the corresponding fastening slots.

[0025] Furthermore, the first lens assembly includes:

[0026] First lens holder; and

[0027] The first lens is mounted on the first lens holder.

[0028] Furthermore, the outer surface of the second lens assembly has external threads;

[0029] The mounting sleeve has an internal thread on its bore wall that mates with the external thread.

[0030] The piezoelectric unit is configured to controllably twist the mounting sleeve, causing the second lens assembly to rotate along the internal thread, thereby causing the second lens assembly to move axially relative to the mounting sleeve.

[0031] Furthermore, the second lens assembly includes:

[0032] Second lens holder;

[0033] The second lens; and

[0034] Third lens;

[0035] The second lens and the third lens are coaxially mounted on the second lens holder.

[0036] Furthermore, the piezoelectric unit is configured with four piezoelectric plates, which are fixedly connected to the mounting sleeve at equal intervals along the circumference of the mounting sleeve.

[0037] The piezoelectric unit is configured to deform the mounting sleeve by generating deformation of the piezoelectric sheet on the opposite side, thereby causing the first lens assembly to move relative to the mounting sleeve, and / or to twist the mounting sleeve by deforming the four piezoelectric sheets, thereby causing the second lens assembly to move relative to the mounting sleeve.

[0038] Furthermore, the lens module also includes:

[0039] A photosensitive device is disposed below the mounting sleeve and is used to convert the received optical signal into an electrical signal.

[0040] Secondly, an electronic device is provided, comprising:

[0041] The lens module as described in any one of the first aspects.

[0042] By incorporating a piezoelectric unit on the mounting sleeve, the unit controls the tilting or twisting of the sleeve based on its piezoelectric effect, thereby causing displacement changes in the first and / or second lens assemblies, thus achieving zoom or image stabilization for the lens module. Using a single piezoelectric module to independently control the zoom and image stabilization of the lens module achieves precise and efficient control. Attached Figure Description

[0043] The above and other objects, features and advantages of the present invention will become clearer from the following description of embodiments of the invention with reference to the accompanying drawings, in which:

[0044] Figure 1 This is an exploded view of the lens module according to the first embodiment of the present invention;

[0045] Figure 2This is a schematic diagram of the lens module according to the first embodiment of the present invention;

[0046] Figure 3 This is a top view of the lens module according to the first embodiment of the present invention;

[0047] Figure 4 This is a YY cross-sectional view of the lens module according to the first embodiment of the present invention;

[0048] Figure 5 This is a cross-sectional view of the lens module according to the first embodiment of the present invention.

[0049] Figure 6 This is a schematic diagram of the internal structure of the mounting sleeve according to the first embodiment of the present invention;

[0050] Figure 7 This is a schematic diagram of the structure of the first lens holder according to the first embodiment of the present invention;

[0051] Figure 8 This is a schematic diagram of the structure of the stabilizing bracket according to the first embodiment of the present invention;

[0052] Figure 9 This is a schematic diagram of the image stabilization of the lens module according to the first embodiment of the present invention;

[0053] Figure 10 This is a schematic diagram of an electronic device according to a second embodiment of the present invention. Detailed Implementation

[0054] The present invention is described below based on embodiments, but the invention is not limited to these embodiments. In the detailed description of the invention below, certain specific details are described in detail. Those skilled in the art will fully understand the invention even without these details. To avoid obscuring the essence of the invention, well-known methods, processes, flows, elements, and circuits are not described in detail.

[0055] Furthermore, those skilled in the art should understand that the accompanying drawings provided herein are for illustrative purposes only and are not necessarily drawn to scale.

[0056] Furthermore, it should be understood that in the following description, "circuit" refers to a conductive loop consisting of at least one element or sub-circuit connected by electrical or electromagnetic connections. When an element or circuit is said to be "connected" to another element or "connected" between two nodes, it can be directly coupled or connected to another element, or there may be intermediate elements. The connection between elements can be physical, logical, or a combination thereof. Conversely, when an element is said to be "directly coupled to" or "directly connected" to another element, it means that there are no intermediate elements between them.

[0057] Unless the context explicitly requires it, words such as "including" or "contains" in the instruction manual should be interpreted as including rather than exclusive or exhaustive; that is, meaning "including but not limited to".

[0058] In the description of this invention, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0059] Figures 1-9 This is a schematic diagram of a lens module according to a first embodiment of the present invention. The lens module includes a first lens assembly 11, a second lens assembly 12, a mounting sleeve 2, and a piezoelectric unit 3. Figure 1 As shown, the mounting sleeve 2 has a through hole, the first lens assembly 11 and the second lens assembly 12 are fixed in the hole of the mounting sleeve 2, and the piezoelectric unit 3 is fixedly connected to the mounting sleeve 2.

[0060] When the lens module needs to zoom, the piezoelectric unit 3 is controlled to drive the second lens assembly 12 to move axially relative to the mounting sleeve 2 to complete the zoom. When the lens module needs image stabilization, the piezoelectric unit 3 is controlled to drive the first lens assembly 11 to move relative to the mounting sleeve 2 in a plane perpendicular to the axial direction of the mounting sleeve 2 to complete the image stabilization.

[0061] Specifically, such as Figure 1 As shown, the lens module described in this embodiment also includes a photosensitive device 6, which is disposed at the bottom of the mounting sleeve 2 and fixedly connected to the mounting sleeve 2. The photosensitive device 6 is perpendicular to the axis of the mounting sleeve 2 and is used to convert the light signals transmitted through the first lens assembly 11 and the second lens assembly 12 into electrical signals for subsequent processing.

[0062] When the distance between the incident light source and the photosensitive device 6 is too close or too far, the incident light cannot reach the photosensitive device 6 at the correct focal length, which will lead to a decrease in the processing quality of the incident light signal by the photosensitive device 6 and thus reduce the imaging quality of the lens module. At this time, the lens module needs to zoom. This is achieved by moving the second lens assembly 12 axially relative to the mounting sleeve 2, thereby causing a relative displacement between it and the photosensitive device 6, which is fixedly connected to the bottom of the mounting sleeve 2. This changes the distance between the incident light source and the second lens assembly 12, thereby adjusting the optical path of the incident light so that it reaches the photosensitive device 6 at a suitable focal length, thus completing the zoom.

[0063] When the relative position of the incident light source and the photosensitive device 6 continuously changes (e.g., the light source is fixed while the photosensitive device 6 continuously shakes), the incident light cannot illuminate the photosensitive device 6 with a relatively constant optical path. This will lead to a decrease in the processing quality of the incident light signal by the photosensitive device 6, thereby reducing the imaging quality of the lens module. Image stabilization of the lens module is then necessary. By moving the first lens assembly 11 relative to the mounting sleeve 2 in a direction perpendicular to the axis of the mounting sleeve 2, and thus displacing it relative to the photosensitive device 6 in that direction, the optical path loss caused by the change in the relative position of the incident light source and the photosensitive device 6 can be compensated, fixing the relative position of the incident light source and the photosensitive device 6, thus achieving image stabilization.

[0064] The connection method between the photosensitive device 6 and the mounting sleeve 2 is not limited to rigid connection methods such as welding or gluing.

[0065] like Figure 1 and Figure 2 As shown, the piezoelectric unit 3 is arranged on the outer surface of the mounting sleeve 2 and is configured to receive electrical signals to generate deformation to drive the mounting sleeve 2, which is tightly connected to it, to generate tilt or torsional deformation. The tilt deformation of the mounting sleeve 2 drives the second lens assembly 12 to move to achieve zoom, and the torsional deformation of the mounting sleeve 2 drives the first lens assembly 11 to move to achieve image stabilization.

[0066] The mounting sleeve 2 is made of a material with extensibility (e.g., an alloy material) so that it can deform under the control of the piezoelectric unit 3. The cross-sectional outer contour shape of the mounting sleeve 2 is not limited to any shape; in this embodiment, the cross-sectional outer contour of the mounting sleeve 2 is square.

[0067] In this embodiment, the image stabilization of the lens module, that is, the movement of the first lens assembly 11 on a plane perpendicular to the axis of the mounting sleeve 2, is achieved by the cooperation of the slide rail and the guide rail.

[0068] Specifically, such as Figure 1 As shown, two grooves 41c are provided opposite to each other on the barrel arm of the mounting sleeve 2, and two first guide rails 41b are provided opposite to each other on the first lens assembly 11 at positions corresponding to the grooves 41c. A first slide rail 41a is fixedly installed in the grooves 41c.

[0069] The first guide rail 41b is slidably connected to the first slide rail 41a, so that the first guide rail 41b can slide along the first slide rail 41a, thereby allowing the first lens assembly 11 to slide along the first slide rail 41a.

[0070] The first slide rail 41a is arranged in a direction perpendicular to the axis of the mounting sleeve 2. The two first slide rails 41a are parallel to each other, so that the movement direction of the first lens assembly 11 along the first slide rail 41a is perpendicular to the axis of the mounting sleeve 2.

[0071] like Figure 7 As shown, in this embodiment, the first guide rail 41b is disposed on both sides of the first lens assembly 11, and the shape of the first guide rail 41b is T-shaped. The first slide rail 41a has a corresponding T-shaped track. The T-shaped first guide rail 41b is connected to the T-shaped track on the first slide rail 41a and forms a clearance fit so that the two can slide relative to each other.

[0072] The shape of the groove 41c should match the shape of the first slide rail 41a so that the first slide rail 41a can be arranged in the groove 41c. In this embodiment, the groove 41c is a rectangular groove, and the first slide rail 41a is a corresponding rectangular piece.

[0073] The connection between the first guide rail 41b and the first lens assembly 11 can be a rigid mechanical connection such as welding or adhesive bonding. Preferably, it can be integrally formed by machine tool cutting or stamping, which provides better structural strength.

[0074] It should be understood that the number of first slide rails 41a is not limited to two; there can be one or more. Correspondingly, the number of first guide rails 41b can also be one or more. As long as it enables the first lens assembly 11 to move along the first slide rails 41a and thus move relative to the mounting sleeve 2 in a direction perpendicular to the axial direction of the mounting sleeve 2, any number of first slide rails 41a and first guide rails 41b are applicable to this invention. Preferably, the number of first slide rails 41a and first guide rails 41b is the same and they correspond one-to-one, so as to improve the stability of the fit.

[0075] It should be understood that the arrangement of the multiple first slide rails 41a and the multiple first guide rails 41b is not limited to a specific position (e.g., arranged opposite each other on both sides in this embodiment). As long as the first lens assembly 11 can move along the first slide rail 41a and then move relative to the mounting sleeve 2 in a direction perpendicular to the axis of the mounting sleeve 2, the first slide rails 41a and the first guide rails 41b can be arranged in any position. For example, one first slide rail 41a can be arranged at the left proximal end of the mounting sleeve 2, and the other first slide rail 41a can be arranged at the right proximal end of the mounting sleeve 2, and the two first slide rails 41a are parallel to each other.

[0076] The first lens assembly 11 is displaced in a direction perpendicular to the axis of the mounting sleeve 2, which can counteract the incident light path deviation or obstruction caused by the shaking of the lens module, so that the incident light reaches the photosensitive device 6 at the correct angle and optical path, thereby achieving the effect of lens module image stabilization.

[0077] The lens module described in this embodiment also includes a stabilizing bracket 5, which is fixedly connected to the mounting sleeve 2, such as... Figure 1 As shown.

[0078] Two second slide rails 42a are arranged opposite each other on the stabilizing bracket 5 along a direction perpendicular to the first slide rail 41a, such as... Figure 1 and Figure 8 As shown. Correspondingly, two second guide rails 42b are provided on the first lens assembly 11 at positions corresponding to the second slide rail 42a. The second slide rail 42a is located at the top of the stabilizing bracket 5, and the second guide rails 42b are located at the bottom of the first lens assembly 11.

[0079] The second guide rail 42b is slidably connected to the second slide rail 42a, so that the second guide rail 42b can slide along the second slide rail 42a, thereby allowing the first lens assembly 11 to slide along the second slide rail 42a.

[0080] The second slide rail 42a is arranged in a direction perpendicular to the axis of the mounting sleeve 2, and the directions of the two second slide rails 42a are parallel to each other, so that the movement direction of the first lens assembly 11 along the second slide rail 42a is perpendicular to the axis of the mounting sleeve 2.

[0081] like Figure 7 As shown, in this embodiment, the second guide rail 42b is rectangular in shape. The second slide rail 42a has a corresponding rectangular track. The rectangular second guide rail 42b is connected to the rectangular track on the second slide rail 42a and forms a clearance fit so that the two can slide relative to each other.

[0082] The connection between the second slide rail 42a and the stabilizing bracket 5 can be a rigid mechanical connection such as welding or adhesive bonding. Preferably, it can be integrally formed by machine tool cutting or stamping, resulting in better structural strength.

[0083] The connection between the second guide rail 42b and the first lens assembly 11 can be a rigid mechanical connection such as welding or adhesive bonding. Preferably, it can be integrally formed by machine tool cutting or stamping, resulting in better structural strength.

[0084] It should be understood that the number of second slide rails 42a is not limited to two; there can be one or more. Correspondingly, the number of second guide rails 42b can also be one or more. As long as the first lens assembly 11 can move along the second slide rails 42a and thus move relative to the mounting sleeve 2 in a direction perpendicular to the axial direction of the mounting sleeve 2, any number of second slide rails 42a and second guide rails 42b are applicable to the present invention. Preferably, the number of second slide rails 42a and second guide rails 42b is the same and they correspond one-to-one, so as to improve the stability of the fit.

[0085] It should be understood that the arrangement of the multiple second slide rails 42a and the multiple second guide rails 42b is not limited to a specific position. As long as it enables the first lens assembly 11 to move along the second slide rail 42a and thus move relative to the mounting sleeve 2 in a direction perpendicular to the axis of the mounting sleeve 2, the second slide rails 42a and the second guide rails 42b can be arranged in any position. For example, one second slide rail 42a can be located at the left proximal end of the stabilizing bracket 5, and another second slide rail 42a can be located at the right proximal end of the stabilizing bracket 5, with the two second slide rails 42a parallel to each other.

[0086] It is easy to understand that the directions of the first slide rail 41a and the second slide rail 42a are three-dimensionally orthogonal to the axis of the mounting sleeve 2. Multiple first slide rails 41a and multiple second slide rails 42a are parallel to each other, allowing the first lens assembly 11 to move in any direction on a plane perpendicular to the axis of the mounting sleeve 2, thus achieving image stabilization of the lens module. For example, the first slide rail 41a is arranged along a direction perpendicular to the XX section, and the second slide rail 42a is arranged along a direction perpendicular to the YY section, where the XX and YY sections are as follows: Figures 3-5 As shown, the first lens assembly 11 can move in any direction on the XY plane, which is the plane perpendicular to the axis of the mounting sleeve 2, by combining vectors X and Y of arbitrary length.

[0087] Preferably, such as Figure 6 and Figure 8 As shown, the stabilizing bracket 5 has two T-shaped locking claws 51 on each side, and a T-shaped locking groove 510 is provided on the corresponding position of the cylindrical wall of the mounting sleeve 2. The stabilizing bracket 5 is fixedly connected to the mounting sleeve 2 by the locking claws 51 engaging with the corresponding locking grooves 510 to form an interference fit. Figure 2 As shown, this facilitates subsequent disassembly and maintenance.

[0088] The connection between the latching claw 51 and the stabilizing bracket 5 can be a rigid mechanical connection such as welding or gluing. Preferably, it can be integrally formed by machine tool cutting or stamping, which provides better structural strength.

[0089] When the mounting sleeve 2 is tilted and deformed under the control of the piezoelectric unit 3, for example, deformation along the direction of the first slide rail 41a, the deformation of the mounting sleeve 2 pushes the latching claw 51 and the stabilizing bracket 5, which are fixedly connected to it, to move along the direction of the first slide rail 41a. The stabilizing bracket 5, through the second slide rail 42a, drives the first lens assembly 11 connected to it to move along the direction of the first slide rail 41a. Similarly, for example, deformation along the direction of the second slide rail 42a, the deformation of the mounting sleeve 2 pushes the first slide rail 41a, which is fixedly connected to it, and the first lens assembly 11 connected to the first slide rail 41a to move along the direction of the second slide rail 42a.

[0090] In another alternative implementation, the stabilizing bracket 5 can also be fixedly connected to the mounting sleeve 2 by a rigid connection method such as welding or gluing, thereby achieving higher connection stability.

[0091] It should be understood that the lens module described in this embodiment can also independently possess a slide rail system composed of a first slide rail 41a and a first guide rail 41b, or a slide rail system composed of a second slide rail 42a and a second guide rail 42b, and perform the corresponding functions described above. For example, a first guide rail 41b is arranged on the first lens assembly 11 along a direction perpendicular to the XX section, and a corresponding first slide rail 41a is arranged on the cylindrical wall of the mounting sleeve 2 at a position corresponding to the first guide rail 41b along a direction perpendicular to the XX section. The first lens assembly 11 can move along a direction perpendicular to the XX section to achieve image stabilization. As another example, a second guide rail 42b is arranged on the first lens assembly 11 along a direction perpendicular to the YY section, and a corresponding second slide rail 42a is arranged on the stabilizing bracket 5 at a position corresponding to the second guide rail 42b along a direction perpendicular to the YY section. The first lens assembly 11 can move along a direction perpendicular to the YY section to achieve image stabilization. Thus, the cost is lower and the manufacturing process of the components can be simplified.

[0092] In one alternative implementation, such as Figure 1 As shown, the first lens assembly 11 includes a first lens 111 and a first lens holder 110. The first lens holder 110 has a first through hole communicating with the cylindrical hole of the mounting sleeve 2. The first lens 111 is disposed in the first through hole for easy subsequent disassembly and maintenance. A first slide rail 41a and a second slide rail 42a are disposed on the first lens holder 110.

[0093] In this embodiment, the zoom of the lens module, that is, the axial movement of the second lens assembly 12 relative to the mounting sleeve 2, is achieved by the engagement of the thread.

[0094] Specifically, such as Figure 1 and Figure 4 As shown, the outer surface of the second lens assembly 12 has an external thread 101, and the cylindrical wall of the mounting sleeve 2 is provided with an internal thread 102 that mates with the external thread 101. The second lens assembly 12 and the mounting sleeve 2 are threadedly connected by the external thread 101 and the internal thread 102.

[0095] When the mounting sleeve 2 is torsionally deformed under the control of the piezoelectric unit 3, the mounting sleeve 2 and the second lens assembly 12 are rotated relative to each other along the thread, thereby causing the second lens assembly 12 to be displaced axially relative to the mounting sleeve 2.

[0096] For example, when the mounting sleeve 2 is fixedly installed relative to the electronic device housing or bracket, the second lens assembly 12 will not rotate with the mounting sleeve 2 when the mounting sleeve 2 is twisted. Instead, it will rotate relative to the mounting sleeve 2 through the internal thread 102. As a result, the second lens assembly 12 will have a relative displacement with the mounting sleeve 2 in the axial direction.

[0097] For example, the second lens assembly 12 can be fixedly mounted relative to the electronic device housing or bracket. When the mounting sleeve 2 is twisted, the second lens assembly 12 will not twist along with it, but will rotate relative to the mounting sleeve 2 through the internal thread 102. As a result, the second lens assembly 12 will have a relative displacement with the mounting sleeve 2 in the axial direction.

[0098] In one alternative implementation, such as Figure 1 As shown, the second lens assembly 12 includes a second lens 112, a third lens 113, and a second lens holder 120. The second lens holder 120 has a first through hole communicating with the cylindrical hole of the mounting sleeve 2. The second lens 112 and the third lens 113 are coaxially disposed in the first through hole, facilitating subsequent disassembly and maintenance. An external thread 101 is provided on the second lens holder 120.

[0099] The displacement of the first lens assembly 11 and the second lens assembly 12 is driven by the deformation of the mounting sleeve 2, and the deformation of the mounting sleeve 2 is driven by the piezoelectric unit 3. Specifically, as Figure 1 As shown, the piezoelectric unit 3 includes four piezoelectric plates, which are made of piezoelectric material with piezoelectric effect. A conductive circuit (not shown in the figure) is also formed on one side surface of the piezoelectric plate. The conductive circuit is electrically connected to the photosensitive element 6 and its function is to receive the electrical signal input by the photosensitive element 6 to cause the piezoelectric plate to produce a corresponding deformation. The deformation of the piezoelectric plate will directly drive the mounting sleeve 2 to produce the desired deformation.

[0100] The piezoelectric effect is a phenomenon in which piezoelectric materials deform along the direction of an external electric field when subjected to such a field. The nonpolar dielectric molecules within a piezoelectric material have non-coincident average centers of positive and negative charge. The vector sum of the line connecting these non-coincident average centers of positive and negative charge and the charge difference between them is called the electric dipole moment. Without an external electric field, due to the anisotropy and dielectric properties of the piezoelectric material, although the directions of the electric dipole moments of the dielectric molecules within the piezoelectric material are arranged randomly at the microscopic level, the vector sum of the electric dipole moments is zero, and macroscopically, no electrical charge is observed. When an external electric field is applied, free charges of opposite polarity are generated on the opposite surface of the piezoelectric material along the direction of the external electric field. Microscopically, the electric dipole moments of the dielectric molecules inside the piezoelectric material deflect along the direction of the external electric field. The centers of positive and negative charges of the electric dipole moments repel each other and attract each other with the free charges on the surface of the piezoelectric material, causing the centers of positive and negative charges of the electric dipole moments to shift relative to each other along the direction of the external electric field. Macroscopically, the piezoelectric material deforms along the direction of the external electric field.

[0101] In this embodiment, the four piezoelectric elements are fixedly connected to the mounting sleeve 2 at equal intervals along the circumferential direction of the outer surface of the mounting sleeve 2. When opposite piezoelectric elements are energized with opposite electrical signals, they deform, causing the mounting sleeve 2 to tilt; or when adjacent piezoelectric elements are energized, the mounting sleeve 2 to twist.

[0102] Specifically, when any piezoelectric element is energized with a sinωt signal, the opposite piezoelectric element is energized with a cosωt signal, and adjacent piezoelectric elements are not energized. The electrical signals cause the piezoelectric elements to undergo tensile or compressive deformation in the axial direction of the mounting sleeve 2. Specifically, when the piezoelectric element energized with a sinωt signal undergoes tensile (compressive) deformation, the piezoelectric element energized with a cosωt signal undergoes compressive (tensile) deformation. The phase difference between the electrical signals of the two piezoelectric elements causes the mounting sleeve 2 to tilt along the direction of piezoelectric element tension (compression).

[0103] For example, such as Figure 3 As shown, the piezoelectric element on the left is subjected to a sinωt signal, resulting in tensile deformation, while the piezoelectric element on the right is subjected to a cosωt signal, resulting in compressive deformation. Because the mounting sleeve 2 is made of a stretchable material, it tilts under the influence of the piezoelectric elements, as... Figure 9 As shown.

[0104] The four piezoelectric elements are connected to the same electrical signal. The electrical signal causes the piezoelectric elements to undergo tensile or compressive deformation in the arrangement direction (which is also the circumferential direction of the mounting sleeve 2 in this embodiment), which in turn causes the mounting sleeve 2 to produce a corresponding torsion.

[0105] Preferably, the piezoelectric element can be made of piezoelectric ceramic material. More preferably, the piezoelectric ceramic material can be lead zirconate titanate-based piezoelectric ceramic, which has a more sensitive piezoelectric effect response accuracy.

[0106] The lens module described in this embodiment uses a piezoelectric unit to drive a flexible material mounting sleeve to produce tilting or torsional deformation, thereby causing the first lens assembly inside the mounting sleeve to move along a slide rail perpendicular to the axis of the mounting sleeve, and / or causing the second lens assembly inside the mounting sleeve to move along a threaded path relative to the axis of the mounting sleeve, thus completing the zoom and / or image stabilization of the lens module. This not only achieves precise and efficient zoom and image stabilization control, but also saves the space required for lens zoom and / or image stabilization.

[0107] Figure 10 This is a schematic diagram of an external electronic device connected to the lens module according to the second embodiment of the present invention. Figure 10 As shown, the electronic device includes a lens module 7 and wires (not shown in the figure). The lens module 7 has the same structure as the lens module in the first embodiment described above, and will not be repeated here. The wires electrically connect the photosensitive element 6 to the piezoelectric unit 3.

[0108] This figure uses a camera phone with zoom and image stabilization functions as an example for illustration purposes only and is not intended to limit the invention. For those skilled in the art, the invention can be applied to the lens modules of any electronic device with zoom and image stabilization functions.

[0109] The lens module described in this embodiment utilizes its own piezoelectric effect principle to achieve zoom or image stabilization. It does not require reserving space outside the lens module for zoom or image stabilization, allowing electronic devices using it to be manufactured in a smaller size or thinner thickness to meet people's demand for portable electronic devices.

[0110] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. For those skilled in the art, the present invention can be modified and varied in various ways. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of the present invention should be included within the scope of protection of the present invention.

Claims

1. A lens module, characterized in that, include: First lens assembly (11); Second lens assembly (12); Mounting sleeve (2), made of a stretchable material, has a through hole for fixing the first lens assembly (11) and the second lens assembly (12). The first lens assembly (11) is movably connected to the mounting sleeve (2) via a slide rail and guide rail, and the second lens assembly (12) is movably connected to the mounting sleeve (2) via a threaded connection. The piezoelectric unit (3), which is fixedly connected to the mounting sleeve (2), is configured to receive an electrical signal to generate deformation to drive the mounting sleeve (2) to generate torsional or tilting deformation; The torsional deformation of the mounting sleeve (2) causes the second lens assembly (12) to screw along the thread, causing the second lens assembly (12) to move axially relative to the mounting sleeve (2) for zooming. The tilting deformation of the mounting sleeve (2) causes the first lens assembly (11) to move relative to the mounting sleeve (2) on a plane perpendicular to the axial direction of the mounting sleeve (2) for image stabilization.

2. The lens module according to claim 1, characterized in that, The lens module also includes: At least one first slide rail (41a) is disposed on the cylindrical wall of the mounting sleeve (2), and the first slide rail (41a) is arranged in a direction perpendicular to the axial direction of the mounting sleeve (2); The first lens assembly (11) has a first guide rail (41b) corresponding to the first slide rail (41a), and the first guide rail (41b) is slidably connected to the corresponding first slide rail (41a).

3. The lens module according to claim 1, characterized in that, The lens module also includes: A stabilizing bracket (5) is fixedly connected to the wall of the bore of the mounting sleeve (2). At least one second slide rail (42a) is provided on the stabilizing bracket (5). The second slide rail (42a) is arranged in a direction perpendicular to the axial direction of the mounting sleeve (2). The first lens assembly (11) has a second guide rail (42b) corresponding to the second slide rail (42a), and the second guide rail (42b) is slidably connected to the corresponding second slide rail (42a).

4. The lens module according to claim 2, characterized in that, The lens module also includes: A stabilizing bracket (5) is fixedly connected to the wall of the bore of the mounting sleeve (2). At least one second slide rail (42a) is provided on the stabilizing bracket (5). The second slide rail (42a) is arranged in a direction perpendicular to the axial direction of the mounting sleeve (2). The first lens assembly (11) has a second guide rail (42b) corresponding to the second slide rail (42a), and the second guide rail (42b) is slidably connected to the corresponding second slide rail (42a); The second slide rail (42a) and the first slide rail (41a) are perpendicular to each other.

5. The lens module according to claim 4, characterized in that, The second guide rail (42b) is disposed at the bottom of the first lens assembly (11); The second slide rail (42a) is located on the top of the stabilizing bracket (5) opposite to the second guide rail (42b).

6. The lens module according to claim 3 or 4, characterized in that, The stabilizing bracket (5) has at least one snap-fit ​​claw (51), and the mounting sleeve (2) has a snap-fit ​​groove (510) corresponding to the snap-fit ​​claw (51). The stabilizing bracket (5) is connected to the mounting sleeve (2) by engaging the engaging claw (51) into the corresponding engaging groove (510).

7. The lens module according to any one of claims 2 to 5, characterized in that, The first lens assembly (11) includes: First lens holder (110); and The first lens (111) is disposed on the first lens holder (110).

8. The lens module according to claim 1, characterized in that, The outer surface of the second lens assembly (12) has an external thread (101); The mounting sleeve (2) has an internal thread (102) on its bore wall that mates with the external thread (101). The piezoelectric unit (3) is configured to controllably twist the mounting sleeve (2) so that the second lens assembly (12) rotates along the internal thread (102), thereby causing the second lens assembly (12) to move axially relative to the mounting sleeve (2).

9. The lens module according to claim 8, characterized in that, The second lens assembly (12) includes: Second lens holder (120); The second lens (112); and Third lens (113); The second lens (112) and the third lens (113) are coaxially disposed on the second lens holder (120).

10. The lens module according to claim 1, characterized in that, The piezoelectric unit (3) is configured with four piezoelectric pieces, which are fixedly connected to the mounting sleeve (2) at equal intervals along the circumference of the mounting sleeve (2). The piezoelectric unit (3) is configured to deform the mounting sleeve (2) by generating deformation of the piezoelectric sheet on the opposite side, thereby causing the first lens assembly (11) to move relative to the mounting sleeve (2), or to twist the mounting sleeve (2) by deforming the four piezoelectric sheets, thereby causing the second lens assembly (12) to move relative to the mounting sleeve (2).

11. The lens module according to claim 1, characterized in that, The lens module also includes: A photosensitive device (6) is disposed below the mounting sleeve (2) and is used to convert the received optical signal into an electrical signal.

12. An electronic device, characterized in that, include: The lens module as described in any one of claims 1-11.

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