Zoom lens module

Abstract

The technical solution of an embodiment of the present invention includes a lens, a support assembly, a moving part, and a driving part made at least partially of piezoelectric material. The moving part is fixedly connected to the lens, and the driving assembly is connected between the support assembly and the moving part. By applying a voltage to the piezoelectric material, the piezoelectric material is excited by the voltage and deforms, driving the moving part to move, and then driving the lens to move, thereby achieving lens zoom. The overall structure is compact and small in size, which can simplify the assembly process and reduce labor and time costs. At the same time, the deformation of the piezoelectric material is changed by changing the magnitude of the voltage, and the deformation direction of the piezoelectric material is changed by changing the direction of the voltage (elongation or shortening), thereby adapting to different zoom conditions. The zoom response is rapid, the control accuracy is high, and the zoom efficiency is high.

Description

Technical Field

[0001] The present invention relates to the field of electronic equipment, and in particular to a variable-focus lens module. Background Art

[0002] Zoom technology plays an important role in obtaining high-definition and high-quality images.

[0003] For most existing cameras, zooming is typically driven by a voice coil motor (VCM), which, in conjunction with a mechanical structure, drives the movement of the lens barrel containing the lens. However, because these zoom lenses require multiple components and achieve displacement through the principle of metal coils cutting magnetic fields, the mechanical structure is complex and bulky. Furthermore, the magnetic field acting on the coils during zooming is unstable. This results in a limited lens displacement distance driven by a VCM, slow displacement changes, and poor control accuracy, leading to low focusing efficiency. Summary of the Invention

[0004] In view of this, an embodiment of the present invention proposes a variable focus lens module, which has a compact structure and small size, can simplify the assembly process, reduce manpower and time costs, and has a fast zoom response, high displacement control accuracy, and high focusing efficiency.

[0005] The zoom lens module according to an embodiment of the present invention includes:

[0006] lens;

[0007] Support components;

[0008] A moving component fixedly connected to the lens; and

[0009] The driving component is at least partially made of piezoelectric material, connected between the supporting component and the moving part, and is configured to generate deformation when excited by voltage and drive the moving part to move.

[0010] Furthermore, the driving assembly includes:

[0011] shrapnel;

[0012] A first piezoelectric module includes a plurality of first piezoelectric sheets arranged around the center of the driving assembly, wherein the first piezoelectric sheets are fixedly connected to one side of the elastic sheet;

[0013] A first conductive plate is connected between the first piezoelectric module and the support assembly, and is used to provide voltage excitation for the first piezoelectric sheet;

[0014] A second piezoelectric module includes a plurality of second piezoelectric sheets, each of the second piezoelectric sheets being arranged opposite to the first piezoelectric sheet on the other side of the elastic sheet; and

[0015] The second conductive plate is connected between the moving component and the second piezoelectric module, and is used to provide voltage excitation for the second piezoelectric piece and / or provide real-time feedback for the deformation of the first piezoelectric piece.

[0016] Furthermore, the shrapnel includes:

[0017] a support portion formed in a ring shape; and

[0018] A plurality of connecting bridge arms, each connecting bridge arm having a first end and a second end;

[0019] The first piezoelectric sheet and the second piezoelectric sheet are respectively fixed on both sides of the connecting bridge arm, the first end is connected to the support portion, the second end extends inside the ring-shaped support portion, and the second end is a free end.

[0020] Furthermore, the second end is provided with a first fixing portion, the first fixing portion faces the adjacent first end, and the first fixing portion is fixedly connected to the moving component.

[0021] Furthermore, the moving part is configured to be ring-shaped;

[0022] The annular hollow portion is used to fix the lens, and a plurality of connecting parts are protruded from the periphery of the moving component, and the connecting parts are fixedly connected to the first fixing part.

[0023] Furthermore, the first conductive plate is configured as a ring-shaped flexible circuit board assembly.

[0024] Furthermore, a plurality of first electrode sheets are provided on the inner side of the first conductive plate, and the first electrode sheets are connected to the first piezoelectric sheet;

[0025] A second electrode sheet is protruded from the outer side of the first conductive plate, and the second electrode sheet is connected to an external circuit for providing voltage to the first piezoelectric sheet;

[0026] The first electrode sheet has a head end and a tail end, the head end is connected to the first conductive plate, and the tail end is a free end.

[0027] Furthermore, the end is provided with a second fixing portion, and the second fixing portion is connected to the piezoelectric piece.

[0028] Furthermore, the second conductive plate is configured as a ring-shaped flexible circuit board assembly.

[0029] The technical solution of the embodiment of the present invention applies voltage to the piezoelectric material, causing the piezoelectric material to deform under the stimulation of the voltage, driving the moving parts to move, and then driving the lens to move, thereby realizing lens zoom. The overall structure is compact and small in size, which can simplify the assembly process and reduce manpower and time costs. At the same time, the deformation of the piezoelectric material is changed by changing the magnitude of the voltage, and the deformation direction of the piezoelectric material is changed (elongation or shortening) by changing the direction of the voltage, so as to adapt to different zoom conditions. The zoom response is fast, the control accuracy is high, and the zoom efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The above and other objects, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

[0031] Figure 1 Schematic diagram of the overall structure of a zoom lens module according to an embodiment of the present invention;

[0032] Figure 2 is an exploded view of a zoom lens module according to an embodiment of the present invention;

[0033] Figure 3 2. It is a bottom view of the overall structure of the zoom lens module according to an embodiment of the present invention;

[0034] Figure 4 is a cross-sectional view of the overall structure of a zoom lens module according to an embodiment of the present invention;

[0035] Figure 5 is a schematic diagram of the drive assembly structure of an embodiment of the present invention;

[0036] Figure 6 is a schematic diagram of a spring structure according to an embodiment of the present invention;

[0037] Figure 7 is a schematic diagram of a first conductive plate structure according to an embodiment of the present invention;

[0038] Figure 8 is a schematic diagram of a second conductive plate structure according to an embodiment of the present invention;

[0039] Figure 9 Schematic diagram of the structure of the moving parts of an embodiment of the present invention.

[0040] In the figure: 1. lens; 2. moving part; 21. connecting part; 3. second conductive plate; 4. second piezoelectric module; 41. second piezoelectric sheet; 5. spring; 51. supporting part; 52. connecting bridge arm; 521. first end; 522. second end; 53. first fixed part; 6. first piezoelectric module; 61. first piezoelectric sheet; 7. first conductive plate; 71. first electrode sheet; 711. head end; 712. tail end; 72. second electrode sheet; 73. second fixed part; 8. supporting assembly. DETAILED DESCRIPTION

[0041] The present invention is described below based on the following examples, but the present invention is not limited to these examples. In the detailed description of the present invention below, certain specific details are described in detail. Those skilled in the art can fully understand the present invention without these details. To avoid obscuring the essence of the present invention, well-known methods, processes, procedures, and components are not described in detail.

[0042] Furthermore, persons of ordinary skill in the art will appreciate that the figures provided herein are for illustration purposes only and are not necessarily drawn to scale.

[0043] Unless the context clearly requires otherwise, words like “include”, “comprising” and the like in the specification should be interpreted as including rather than exclusive or exhaustive; that is, as “including but not limited to”.

[0044] In the description of the present invention, it should be understood that the terms "first", "second", etc. are used for descriptive purposes only and should not be understood to indicate or imply relative importance. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0045] like Figures 1 to 4 As shown, the zoom lens module of an embodiment of the present invention includes a lens 1, a support assembly 8, a moving part 2, and a drive assembly. The moving part 2 is bonded or welded to the lens 1. The drive assembly is at least partially made of piezoelectric material, connected between the support assembly 8 and the moving part 2, and is configured to deform under voltage excitation to drive the moving part 2 to move. In a preferred embodiment, the voltage excitation uses direct current. Under the excitation of the direct current, the piezoelectric material deforms from one length to another. The magnitude and / or direction of the direct current voltage changes, and the deformation amount and / or deformation direction (elongation or shortening) of the piezoelectric material changes accordingly. Thus, by applying voltage excitation to the drive assembly, the drive assembly deforms, driving the moving part 2 and the lens 1 fixed to the moving part 2 to move relative to the support assembly 8, thereby achieving zoom of the lens 1. Compared with traditional zoom drive structures, the zoom lens module in the embodiment of the present invention has a compact structure and a small size, which simplifies the assembly process of the zoom lens module, thereby reducing the manpower and time costs of assembly.

[0046] Piezoelectric materials are crystalline materials that generate a voltage between their two end faces when subjected to pressure. Piezoelectric materials can generate an electric field due to mechanical deformation or mechanical deformation due to the action of an electric field. Types of piezoelectric materials include inorganic piezoelectric materials, organic piezoelectric materials, and composite piezoelectric materials. Among them, inorganic piezoelectric materials include piezoelectric crystals and piezoelectric ceramics. Organic piezoelectric materials, also known as piezoelectric polymers, include polyvinylidene chloride (film) and other organic piezoelectric (film) materials represented by it. Composite piezoelectric materials are made by embedding sheet, rod, rod, or powdered piezoelectric materials in an organic polymer base material. The application areas of piezoelectric materials include vibration energy and ultrasonic vibration energy-electric energy transducers, drivers, and piezoelectric sensors. In addition, the deformation of the piezoelectric material can be changed by changing the magnitude of the voltage, and the deformation direction of the piezoelectric material (elongation or shortening) can be changed by changing the direction of the voltage, thereby adapting to different zoom conditions, expanding the application range of the zoom lens module, and improving zoom efficiency.

[0047] Figure 5 FIG is a schematic diagram of the drive assembly structure of an embodiment of the present invention. Figure 5 As shown, the drive assembly includes a first drive unit, a spring 5, and a second drive unit. The first drive unit includes a first conductive plate 7 and a first piezoelectric module 6, and the second drive unit includes a second piezoelectric module 4 and a second conductive plate 3. The first piezoelectric module 6 includes multiple first piezoelectric plates 61 arranged around the center of the drive assembly. The first conductive plate 7 is disposed between the first piezoelectric module 6 and the support assembly 8. The spring 5 is connected between the first piezoelectric module 6 and the second piezoelectric module 4. The second piezoelectric module 4 includes multiple second piezoelectric plates 41, each of which is disposed on the spring 5 opposite to the first piezoelectric plate 61. The second conductive plate 3 is disposed between the moving component 2 and the second piezoelectric module 4. In an optional implementation, the first piezoelectric plates 61 are welded to the electrodes of the first conductive plate 7 and bonded to the portions of the first conductive plate 7 other than the electrodes. The second piezoelectric plates 41 are welded to the electrodes of the second conductive plate 3 and bonded to the portions of the second conductive plate 3 other than the electrodes. The first conductive plate 7 is bonded to the support assembly 8. Therefore, by bonding, while achieving a fixed connection between the components, the stress distribution of the bonding parts between the components is more uniform, the fastening strength during connection is high, the cost is low, and the weight is light, which is conducive to reducing the production cost of the zoom lens module and extending the service life of the zoom lens module.

[0048] Preferably, the first piezoelectric sheet 61 and the second piezoelectric sheet 41 have the same structure, both utilizing block-shaped piezoelectric ceramics. Piezoelectric ceramics have strong piezoelectricity and high sensitivity. Thus, applying voltage to the piezoelectric ceramics enables zooming of the lens 1, resulting in a rapid zoom response and improved zoom control accuracy for the zoom lens module. Furthermore, the block-shaped piezoelectric sheet facilitates manufacturing and installation, further reducing the labor and time required to assemble the zoom lens module.

[0049] Preferably, the first conductive plate 7 and the second conductive plate 3 can be simultaneously connected to an external circuit to provide voltage excitation to the first piezoelectric plate 61 and the second piezoelectric plate 41, respectively, so that the first piezoelectric plate 61 and the second piezoelectric plate 41 are deformed, thereby driving the moving component 2 and the lens 1 to move, thereby achieving zooming of the lens 1. Alternatively, the first conductive plate 7 and the second conductive plate 3 can be configured so that any one of the conductive plates is connected to an external circuit to provide voltage excitation to the piezoelectric plate; the other conductive plate is connected to an external feedback circuit to provide real-time feedback on the deformation of the piezoelectric plate under voltage excitation. When there is a deformation difference between the piezoelectric plates in the deformed piezoelectric module, resulting in inaccurate focusing, the piezoelectric plate in the other piezoelectric module provides corresponding deformation compensation, thereby achieving precise zooming of the variable-focus lens module.

[0050] Figure 6 Schematic diagram of the spring structure of an embodiment of the present invention. Figure 6 As shown, the spring 5 includes a support portion 51 formed in a ring or polygonal shape and a plurality of connecting bridge arms 52. The plurality of connecting bridge arms 52 are evenly arranged on the inner side of the support portion 51, and each connecting bridge arm 52 has a first end 521 and a second end 522. Each first end 521 is connected to the support portion 51, and the second end 522 extends inside the support portion 51 and is set as a free end. The second end 522 is provided with a first fixing portion 53, which faces the adjacent first end 521, and is bonded and fixed to the moving part 2. Among them, the first piezoelectric plate 61 is bonded to the bottom of the connecting bridge arm 52. The second piezoelectric plate 41 is bonded to the top of the connecting bridge arm 52. The spring 5 is bonded to the first conductive plate 7 excluding the portion connected to the first piezoelectric plate 61, and is bonded to the second conductive plate 3 excluding the portion connected to the second piezoelectric plate 41. Thus, when the first piezoelectric sheet 61 and / or the second piezoelectric sheet 41 deforms, it drives the connecting bridge arm 52 to move, and in turn drives the moving component 2 bonded to the first fixing portion 53 to move, thereby reducing the movement resistance of the lens 1 during zooming, making zooming of the lens 1 more convenient and further improving the zooming efficiency. Furthermore, through bonding, while achieving a fixed connection between the components, the stress distribution in the bonding portion between the components is more uniform, resulting in high fastening strength during the connection, low cost, and light weight, which is conducive to reducing the production cost of the zoom lens module and extending the service life of the zoom lens module.

[0051] Preferably, the second end 522 is bent inwardly at a predetermined angle relative to the main body of the connecting bridge arm 52 , thereby pointing to the first end 521 of an adjacent connecting bridge arm 52 .

[0052] In an optional implementation, the connecting bridge arm 52 is arranged on the inner side of the support portion 51 substantially parallel to the edge of the annular or polygonal support portion 51, and the first fixing portion 53 is arranged as a step structure located above the second end 522, with the open portion of the step structure facing the adjacent first end 521. The upper portion of the step structure is used to connect with the mounting portion of the moving component 2. Since the connecting portion is a certain distance higher than the plane where the main portion of the entire shrapnel 5 and the second conductive plate 3 are located, it is easier to position during installation. At the same time, such a structure also facilitates the one-piece molding of the shrapnel 5, facilitates the processing and manufacturing of the shrapnel 5, and reduces the production cost of the zoom lens module.

[0053] Figure 7 Schematic diagram of the first conductive plate structure according to an embodiment of the present invention. Figure 7 As shown, in this embodiment, the first conductive plate 7 is configured as a ring-shaped flexible circuit board assembly, and a plurality of first electrode sheets 71 are evenly arranged on the inner side of the ring of the first conductive plate 7, and a second electrode sheet 72 is protruding from the outer side of the ring of the conductive plate. The first electrode sheet 71 is used to connect the piezoelectric sheet. The second electrode sheet 72 is used to connect the external circuit. The first conductive plate 7 receives the voltage provided by the external circuit through the second electrode sheet 72, and transmits it to each first electrode sheet 71 to provide excitation for the first piezoelectric sheet 61. The first electrode sheet 71 has a head end 711 and a tail end 712. The head end 711 is connected to the first conductive plate 7, and the tail end 712 is a free end. The tail end 712 is provided with a second fixing portion 73, which is arranged below the tail end 712 and forms a step with the tail end 712, so as to facilitate bonding and fixing the first piezoelectric sheet 61 above the second fixing portion 73.

[0054] In an optional implementation, the number of the above-mentioned second fixing parts 73, the number of the first piezoelectric sheets 61, the number of the second piezoelectric sheets 41 and the number of the connecting bridge arms 52 are correspondingly set to four, thereby improving the stability of the zoom lens module structure and facilitating assembly.

[0055] Figure 8 Schematic diagram of the second conductive plate structure according to an embodiment of the present invention. Figure 8 As shown, in this embodiment, the second conductive plate 3 is configured as a ring-shaped flexible circuit board assembly, and the second conductive plate 3 has a substantially identical structure to the first conductive plate 7, except that the second fixing portion 73 in the second conductive plate 3 is disposed above the end 712 and forms a step with the end 712, thereby facilitating bonding and fixing the second piezoelectric sheet 41 below the second fixing portion 73.

[0056] Figure 9FIG. 1 is a schematic diagram of the structure of the moving parts of an embodiment of the present invention. Figure 9 As shown, in this embodiment, the moving component 2 is configured as a metal ring, the hollow portion of which is used to fix the lens 1. A plurality of connecting portions 21 are uniformly protruded from the periphery of the moving component 2 to facilitate the installation and fixation of the moving component 2 and the first fixing portion 53. The connecting portions 21 and the first fixing portion 53 are configured to be bonded or welded. Thus, by fixing the connecting portions 21 and the first fixing portion 53 of the second conductive plate 3 by bonding or welding, the fixing method of the moving component 2 is more flexible, further facilitating the assembly of the zoom lens module.

[0057] The technical solution of the embodiment of the present invention provides voltage excitation to the piezoelectric piece through the first conductive plate and / or the second conductive plate, causing the piezoelectric piece to deform, driving the connecting bridge arm and the first fixed part to move, and then driving the moving parts and the lens to move, thereby realizing the zoom of the lens. The overall structure is compact and small in size, which can simplify the assembly process and reduce manpower and time costs. At the same time, the deformation of the piezoelectric piece is changed by changing the voltage value, and the elongation or shortening of the piezoelectric piece is changed by changing the direction of the voltage, so as to adapt to different zoom conditions. The zoom response is fast, the control accuracy is higher, and the focusing efficiency is also higher.

[0058] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A zoom lens module, characterized in that: include: Lens (1); Support assembly (8); A moving component (2) fixedly connected to the lens (1); as well as A drive assembly comprising a first drive unit, a spring (5), and a second drive unit, wherein the drive assembly is connected between the support assembly (8) and the moving component (2), and the spring (5) is connected to the moving component (2); Wherein, the first driving unit includes: A first piezoelectric module (6) comprises a plurality of first piezoelectric sheets (61) arranged around the center of the driving assembly, wherein the first piezoelectric sheets (61) are fixedly connected to one side of the elastic sheet (5); a first conductive plate (7) connected between the first piezoelectric module (6) and the supporting assembly (8), for providing voltage excitation to the first piezoelectric sheet (61) to cause the first piezoelectric sheet (61) to deform, and for driving the moving component (2) and the lens (1) to move via the spring (5); The second driving unit includes: a second piezoelectric module (4), comprising a plurality of second piezoelectric sheets (41), each of the second piezoelectric sheets (41) being arranged on the other side of the spring sheet (5) opposite to the first piezoelectric sheet (61), and the second piezoelectric sheets (41) and the first piezoelectric sheets (61) having the same structure; and A second conductive plate (3) is connected between the moving component (2) and the second piezoelectric module (4), and is used to provide real-time feedback for the deformation of the first piezoelectric plate (61), and to provide voltage excitation to the second piezoelectric plate (41) based on the feedback, so that the second piezoelectric plate (41) generates corresponding deformation compensation and drives the moving component (2) and the lens (1) to move through the spring (5); The spring piece (5) comprises a support portion (51), a plurality of connecting bridge arms (52) and a plurality of first fixing portions (53); the plurality of connecting bridge arms (52) are arranged on the inner side of the support portion (51) parallel to the edge of the supporting portion (51); each connecting bridge arm (52) has a first end (521) and a second end (522); and the first fixing portion (53) is arranged as a step structure located above the second end (522).

2. The zoom lens module according to claim 1, wherein: The support portion (51) is formed in a ring shape, the first piezoelectric sheet (61) and the second piezoelectric sheet (41) are respectively fixed on both sides of the connecting bridge arm (52), the first end (521) is connected to the support portion (51), and the second end (522) extends inside the ring shape of the support portion (51), and the second end (522) is a free end.

3. The variable focus lens module according to claim 1, wherein: The first fixing portion (53) faces the adjacent first end (521), and the first fixing portion (53) is fixedly connected to the moving component (2).

4. The variable focus lens module according to claim 3, wherein: The moving part (2) is arranged in a ring shape; The annular hollow portion is used to fix the lens (1); a plurality of connecting portions (21) are protrudingly provided on the periphery of the moving component (2); and the connecting portions (21) are fixedly connected to the first fixing portion (53).

5. The variable focus lens module according to claim 4, wherein: The first conductive plate (7) is configured as a ring-shaped flexible circuit board assembly.

6. The variable focus lens module according to claim 5, wherein: A plurality of first electrode sheets (71) are provided on the inner side of the first conductive plate (7), and the first electrode sheets (71) are connected to the first piezoelectric sheet (61); A second electrode sheet (72) is protruding from the outer side of the first conductive plate (7), and the second electrode sheet (72) is connected to an external circuit and is used to provide voltage to the first piezoelectric sheet (61); The first electrode sheet (71) has a head end (711) and a tail end (712), the head end (711) is connected to the first conductive plate (7), and the tail end (712) is a free end.

7. The variable focus lens module according to claim 6, wherein: The end (712) is provided with a second fixing portion (73), and the second fixing portion (73) is connected to the first piezoelectric piece (61).

8. The variable focus lens module according to claim 5, wherein: The second conductive plate (3) is configured as a ring-shaped flexible circuit board assembly.

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