Aperture driving mechanism, lens driving device and camera module

Abstract

The utility model relates to an aperture driving mechanism, a lens driving device and a camera module, the aperture driving mechanism comprises an aperture base and a rotation driving assembly for driving a plurality of aperture blades to move relative to the aperture base in a plane vertical to an optical axis, and the rotation driving assembly comprises an aperture driving frame rotatably connected with the aperture base; on the plane, the aperture base and the aperture driving frame are connected through at least two memory alloy wires; in the telescopic direction of each memory alloy wire, the aperture base and the aperture driving frame are connected through an elastic damping piece. The mechanism has the advantages that the elastic damping parts in bidirectional connection are utilized, so that the mechanism can control the aperture more accurately, and meanwhile, the elastic damping parts can reset the blades when the mechanism does not need to work.

Description

Technical Field

[0001] The present application belongs to the field of electronic equipment camera, and in particular, relates to an aperture driving mechanism, a lens driving device and a camera module. Background Art

[0002] The aperture drive mechanism refers to a mechanical device used to control the aperture size of a camera lens. In a camera lens, the aperture is an adjustable aperture consisting of multiple thin sheets or blades, which is used to control the amount of light entering the camera, thereby adjusting the depth of field and the brightness of the light.

[0003] The micro camera used in mobile phones is generally equipped with a variable aperture on the lens, which is placed at the front end of the lens. Therefore, it will increase the total height and weight of the lens, causing adverse effects on the focus drive mechanism.

[0004] Patent CN218567794U discloses a variable aperture camera drive device, including blades, a carrier assembly, a guide and a drive assembly; the carrier assembly includes a fixed carrier, a rotating carrier and a supporting carrier; the two ends of the blade are respectively connected to the fixed carrier and the rotating carrier; the fixed carrier is connected to the supporting carrier, the rotating carrier is arranged between the fixed carrier and the supporting carrier, and a guide is arranged between the rotating carrier and the supporting carrier; the drive assembly includes a fixed part, a rotating part, a memory alloy wire and a supporting part, one end of the fixed part and one end of the rotating part are connected by a memory alloy wire, and the other end of the fixed part is fixed on the supporting carrier; one end of the rotating part is also connected to the supporting carrier through the supporting part, and the other end of the rotating part is connected to the rotating carrier to drive the rotating carrier to rotate relative to the supporting carrier. The utility model drives the rotating carrier to rotate through the driving assembly, which can make the aperture adjustment range larger and avoid magnetic field interference.

[0005] In the above patent, the memory wire is used to drive the blades to open and close, but the structure is relatively simple, and the single wire drive has low accuracy in aperture control, and the aperture size and reset effect cannot be guaranteed. Utility Model Content

[0006] The purpose of the utility model is to provide an aperture driving mechanism, a lens driving device and a camera module that can solve the above technical problems.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] An aperture driving mechanism, comprising an aperture base, and a rotation driving assembly for driving a plurality of aperture blades to move relative to the aperture base in a plane perpendicular to the optical axis, wherein the rotation driving assembly comprises an aperture driving frame rotatably connected to the aperture base;

[0009] On the plane, the aperture base and the aperture driving frame are connected by at least two memory alloy wires;

[0010] In at least part of the extension direction of each memory alloy wire, the aperture base and the aperture drive frame are connected by an elastic damping member; the memory alloy wire is used to drive the aperture drive frame to rotate around the optical axis and drive a plurality of aperture blades to open and close during the power-on extension process.

[0011] Furthermore, the memory alloy wires projected onto the plane are symmetrically distributed relative to the optical axis.

[0012] Furthermore, the angles formed between the two ends of the memory alloy wire and the lines connecting the center of the aperture drive frame are greater than 90° and less than 180°, the memory alloy wire forms at least one corner between its two ends, and the aperture drive frame is provided with an alloy wire limiting boss corresponding to the corner of the memory alloy wire.

[0013] Furthermore, the elastic damping member forms at least one corner between its two ends, the aperture driving frame is provided with a damping member limiting shoulder at the corner corresponding to the elastic damping member, and a gap is formed between the memory alloy wire and the elastic component.

[0014] Furthermore, the aperture base is provided with a guide seat protruding from one end surface thereof, at least a portion of the aperture drive frame is located on the side of the guide seat away from the aperture base and a space for accommodating at least a portion of the memory alloy wire and the elastic damping member is formed between the aperture base and the guide seat, and the aperture drive frame and the guide seat are rotatably connected.

[0015] Furthermore, the aperture base is provided with at least two limiting bosses; along the circumferential direction of the aperture driving frame, at least a portion of the aperture driving frame is located between the two limiting bosses.

[0016] Furthermore, two conductive terminals are provided on the aperture base, and a connecting terminal is provided on the side of the aperture drive frame away from the conductive terminals. There are two memory alloy wires, each of the conductive terminals is connected to one of the memory alloy wires, and the other end of the memory alloy wire is connected to the connecting terminal.

[0017] Furthermore, at least one of the elastic damping members is made of a metal spring sheet, and one end of the elastic damping member is connected to the connecting terminal, and the other end forms a terminal for conducting electricity.

[0018] The present application also provides a lens driving device, which includes the aperture driving mechanism.

[0019] The present application also provides a camera module, which includes the lens driving device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a main structural diagram of the rotary drive assembly of the utility model;

[0021] Figure 2 for Figure 1 A top view of the main structure of the middle rotation drive assembly;

[0022] Figure 3 This is a bottom view of the main structure of the rotary drive assembly of the utility model;

[0023] Figure 4 It is an assembly diagram of the main components of the aperture drive mechanism of the utility model;

[0024] Figure 5 for Figure 4 Assembly top view of the main components;

[0025] Figure 6 This is a finished assembly diagram of the aperture drive mechanism of the utility model;

[0026] Figure 7 It is the assembly diagram of the aperture blades and gaskets of the utility model;

[0027] Figure 8 This is a schematic diagram of an electronic device in the fourth embodiment.

[0028] In the figure, the aperture base 1, the conductive terminal 10, the fixing pin 11, the aperture blade 2, the rotation drive assembly 3, the aperture drive frame 30, the connecting terminal 300, the alloy wire limiting boss 301, the damping member limiting boss 302, the memory alloy wire 31, the elastic damping member 32, the guide seat 4, the limiting boss 5, the gasket 6, the optical axis Z, and the plane xY. DETAILED DESCRIPTION

[0029] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0030] Embodiment 1

[0031] like Figure 1-Figure 7 As shown, it includes an aperture base 1, and a rotation drive assembly 3 for driving a plurality of aperture blades 2 to move relative to the aperture base 1 in a plane xY perpendicular to the optical axis Z, the rotation drive assembly 3 includes an aperture drive frame 30 rotatably connected to the aperture base 1;

[0032] On the plane xY, the aperture base 1 and the aperture driving frame 30 are connected by at least two memory alloy wires 31;

[0033] In at least part of the extension and retraction direction of each memory alloy wire 31, the aperture base 1 and the aperture drive frame 30 are connected by an elastic damping member 32; the memory alloy wire 31 is used to drive the aperture drive frame 30 to rotate around the optical axis Z and drive a plurality of aperture blades 2 to open and close during the power-on extension and retraction process.

[0034] The two memory alloy wires 31 respectively control the forward and reverse rotation of the aperture driving frame 30. When rotation is required, one memory alloy wire 31 contracts and the other expands. The elastic damping member 32 is used for power supply and rebound reset.

[0035] The memory alloy wires 31 projected on the plane xY are symmetrically distributed relative to the optical axis Z.

[0036] The memory alloy wires 31 are symmetrically distributed relative to the optical axis Z, which can improve the overall symmetry of the device or system. Symmetry helps to reduce uneven stress and deformation, improve the stability and accuracy of the device, and the memory alloy wires 31 are located inside the elastic damping member 32, which can increase the stability of the system, and at the same time can effectively utilize space, reduce the volume of the system, and make the system more compact and easy to install.

[0037] The angles formed between the two ends of the memory alloy wire 31 and the line connecting the center of the aperture drive frame 30 are greater than 90° and less than 180°. The memory alloy wire 31 forms at least one corner between its two ends. The aperture drive frame 30 is provided with an alloy wire limiting boss 301 at the corner corresponding to the memory alloy wire 31.

[0038] By controlling the size of the angle, the movement trajectory and path of the memory alloy wire can be optimized, making it more precise and effective when performing specific tasks. The alloy wire limiting boss 301 has the function of limiting and guiding the memory alloy wire 31. At the same time, the alloy wire limiting boss 301 has a lubricating effect to prevent the memory alloy wire 31 from being worn and broken for a long time.

[0039] The elastic damping member 32 forms at least one corner between its two ends, and the aperture driving frame 30 is provided with a damping member limiting shoulder 302 at the corner corresponding to the elastic damping member 32, and a gap is formed between the memory alloy wire 31 and the elastic damping member 32. In other embodiments, the elastic damping member 32 may extend in a straight line direction without a corner.

[0040] The damping member limiting boss 302 can limit the movement range of the elastic damping member 32 on the aperture drive frame 30, ensuring that the elastic damping member 32 is stably fixed at the set position to prevent it from unnecessary movement or swinging during operation; the gap between the memory alloy wire 31 and the elastic damping member 32 can ensure the stability of the current and prevent a short circuit from affecting the mechanism.

[0041] The aperture base 1 is provided with a guide seat 4 protruding from one end surface thereof, at least part of the aperture drive frame 30 is located on the side of the guide seat 4 away from the aperture base 1, and a space for accommodating at least part of the memory alloy wire 31 and the elastic damping member 32 is formed between the guide seat 4 and the aperture base 1, and the aperture drive frame 30 is rotatably connected with the guide seat 4. In this embodiment, the guide seat 4 is provided with a plurality of guide seats along the inner ring of the aperture base 1, and a groove along the circumference of the aperture base 1 is provided on the guide seat 4, and a ball is placed in the groove, and the aperture drive frame 30 realizes relative rotation through the ball and the guide seat 4, and a magnetic attraction structure can be provided between the aperture base 1 and the aperture drive frame 30 to maintain the stability of the aperture drive frame 30. In other embodiments, the guide seat 4 can be annular, and a plurality of grooves for placing balls are provided along the circumference of the guide seat 4.

[0042] The space formed among the aperture base 1, the guide seat 4 and the aperture drive frame 30 can accommodate the memory alloy wire 31 and the elastic damping member 32, so that they can move freely and function while maintaining a relatively stable position. The rotational connection between the aperture drive frame 30 and the guide seat 4 can make the aperture drive frame 30 have better flexibility and stability when rotating.

[0043] The aperture base 1 is provided with at least two limiting bosses 5 ; along the circumference of the aperture driving frame 30 , at least a portion of the aperture driving frame 30 is located between the two limiting bosses 5 .

[0044] The function of the limiting boss 5 is to limit the rotation angle range between the aperture drive frame 30 and the aperture base 1, control the aperture to change within a reasonable range, and at the same time can increase the overall radial size of the aperture drive frame 30 to achieve greater strength.

[0045] Two conductive terminals 10 are provided on the aperture base 1, and a connecting terminal 300 is provided on the side of the aperture driving frame 30 away from the conductive terminal 10. There are two memory alloy wires 31, each conductive terminal 10 is connected to a memory alloy wire 31, and the other end of the memory alloy wire 31 is connected to the connecting terminal 300.

[0046] By utilizing the conductive terminals 10 and the connecting terminals 300 on the aperture base 1, space can be effectively utilized, making the system more compact, reducing the volume of the system, and facilitating installation and layout; at the same time, connecting the two ends of the memory alloy wire to different conductive terminals and connecting terminals respectively can avoid circuit interference and signal interference, thereby ensuring the stability and reliability of the system.

[0047] At least one elastic damping member 32 is made of a metal spring sheet, and one end of the elastic damping member 32 is connected to the connecting terminal 300, and the other end forms a terminal for conducting electricity, and the conducting terminal extends out of the housing of the aperture driving mechanism.

[0048] The metal reed has good elasticity and can quickly return to its original shape after being acted upon by an external force. The elasticity of the metal reed can be changed by adjusting the thickness, shape or structure of the material to achieve different elastic effects. It has a certain degree of adjustability and is usually light in weight. It can provide elastic support and shock absorption effects without increasing the weight of the system. The memory alloy wire 31 can be energized by connecting the elastic damping member 32 to the connection terminal 300.

[0049] Embodiment 2

[0050] The structure and principle of this embodiment are basically the same as those of the first embodiment. The difference lies in that, with respect to the aperture driving mechanism of the first embodiment, this embodiment describes other structural components in the aperture driving mechanism and the coordination between the structural components.

[0051] Specifically, the aperture drive mechanism also includes gaskets 6 arranged on both sides of the aperture blades 2 in the thickness direction, and a plurality of fixing pins 11 are also arranged on the aperture base 1. The gasket 6 located on the side of the aperture blade 2 away from the aperture base 1 is connected to one end of each aperture blade 2 through the fixing pin 11, and the aperture blade 2 can rotate relatively around the fixing pin 11. In this embodiment, some of the fixing pins 11 are arranged on the end surface of the limiting boss 5 away from the aperture base 1, and other parts of the fixing pins 11 are fixed on the aperture base 1, wherein the connecting terminal 300 is provided with a long hole for passing one of the fixing pins 11, so that the connecting terminal 300 can rotate around the optical axis Z without interfering with the fixing pin 11. The aperture blade 2 is connected to the aperture drive frame 30. The aperture drive frame 30 is provided with a driving column. The driving column extends into the strip hole provided on the aperture blade 2. When the aperture drive frame 30 rotates around the optical axis, the driving column and the strip hole slide relative to each other, and can drive the aperture blade 2 to rotate around the axis of the fixing pin 11, thereby realizing the opening and closing of the light-transmitting hole formed by multiple aperture blades 2. The function of the gasket 6 can improve the movement stability of the aperture blade 2 and improve the efficiency of controlling the aperture size. At the same time, it can also prevent dust from entering the area where the aperture blade 2 is located and affecting the blade, thereby improving the service life. The gasket 6 is provided with a hole for passing the fixing pin 11 and a waist-shaped hole for passing the driving column.

[0052] The aperture drive frame 30 and the aperture base 1 are stacked up and down on the optical axis Z. A guide seat 4 is arranged between the aperture base 1 and the aperture drive frame 30. The guide seat 4 includes a plurality of balls and ball grooves for guiding the balls. The function of the guide seat 4 is to enable the aperture base 1 and the aperture drive frame 30 to rotate relative to each other around the optical axis Z, so that the aperture drive frame 30 drives the aperture blades 2 to control the aperture size. A limiting boss 5 is also arranged between the aperture base 1 and the aperture drive frame 30. This structure limits the rotation angle between the aperture base 1 and the aperture drive frame 30 to prevent the aperture from being controlled too large or too small, thereby improving the stability of the mechanism.

[0053] Embodiment 3

[0054] The structure and principle of this embodiment are basically the same as those of the first embodiment, and the difference lies in that, in contrast to the aperture driving mechanism of the first embodiment, the lens driving device of this embodiment includes an aperture driving mechanism.

[0055] The aperture driving device is fixed at the front end of the lens in the lens driving device, and the aperture driving device is connected to the external control circuit. External light passes through the aperture driving component and enters the lens in the lens driving device, and is refracted, and finally reaches the imaging area of ​​the device.

[0056] Embodiment 4

[0057] The structure and principle of this embodiment are basically the same as those of the second embodiment, and the different structure is that, with respect to the lens driving device of the above-mentioned third embodiment, the camera module device of this embodiment includes a lens driving device.

[0058] like Figure 8 As shown, the camera module is used in electronic devices, including 3C products, such as computers, mobile smart phones and digital cameras. In this embodiment, the module is used as a camera imaging component of a mobile smart phone.

[0059] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. An aperture drive mechanism, comprising an aperture base (1), and a rotation drive assembly (3) for driving a plurality of aperture blades (2) to move relative to the aperture base (1) in a plane (xY) perpendicular to an optical axis (Z), characterized in that: The rotation drive assembly (3) comprises an aperture drive frame (30) rotatably connected to the aperture base (1); On the plane (xY), the aperture base (1) and the aperture driving frame (30) are connected via at least two memory alloy wires (31); In at least a portion of the telescopic direction of each memory alloy wire (31), the aperture base (1) and the aperture drive frame (30) are connected via an elastic damping member (32); the memory alloy wire (31) is used to drive the aperture drive frame (30) to rotate around the optical axis (Z) and drive a plurality of aperture blades (2) to open and close during the telescopic process when powered on.

2. The aperture drive mechanism according to claim 1, characterized in that: The memory alloy wires (31) projected onto the plane (xY) are symmetrically distributed relative to the optical axis (Z).

3. The aperture drive mechanism according to claim 1, characterized in that: The angles formed between the two ends of the memory alloy wire (31) and the lines connecting the center of the aperture drive frame (30) are greater than 90° and less than 180°, the memory alloy wire (31) forms at least one corner between its two ends, and the aperture drive frame (30) is provided with an alloy wire limiting shoulder (301) at the corner corresponding to the memory alloy wire (31).

4. The aperture drive mechanism according to claim 3, characterized in that: The elastic damping member (32) forms at least one corner between its two ends, the aperture drive frame (30) is provided with a damping member limiting shoulder (302) at the corner corresponding to the elastic damping member (32), and a gap is formed between the memory alloy wire (31) and the elastic damping member (32).

5. The aperture drive mechanism according to claim 1, characterized in that: The aperture base (1) is provided with a guide seat (4) protruding from one end surface thereof; at least a portion of the aperture drive frame (30) is located on a side of the guide seat (4) away from the aperture base (1) and a space is formed between the aperture base (1) and the guide seat for accommodating at least a portion of the memory alloy wire (31) and the elastic damping member (32); the aperture drive frame (30) and the guide seat are rotatably connected.

6. The aperture drive mechanism according to claim 1, characterized in that: The aperture base (1) is provided with at least two limiting bosses (5); along the circumferential direction of the aperture drive frame (30), at least a portion of the aperture drive frame (30) is located between the two limiting bosses (5).

7. The aperture driving mechanism according to any one of claims 1 to 6, characterized in that: Two conductive terminals (10) are provided on the aperture base (1), a connecting terminal (300) is provided on a side of the aperture drive frame (30) away from the conductive terminals (10), there are two memory alloy wires (31), each of the conductive terminals (10) is connected to one of the memory alloy wires (31), and the other end of the memory alloy wire (31) is connected to the connecting terminal (300).

8. The aperture drive mechanism according to claim 7, characterized in that: At least one of the elastic damping members (32) is made of a metal spring sheet, and one end of the elastic damping member (32) is connected to the connecting terminal (300), and the other end forms a terminal for conducting electricity.

9. A lens driving device, characterized in that: The lens driving device comprises the aperture driving mechanism according to any one of claims 1-8.

10. A camera module, characterized in that: The camera module includes the lens driving device described in claim 9.

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