Aperture drive device, photographing device, and electronic device

Abstract

This application provides an aperture driving device, a photographic device, and an electronic device. The aperture driving device includes a stator providing a stator opening; a mover providing an aperture opening with a variable size, the aperture opening being within the range of the stator opening; and an SMA assembly connected to the mover to drive the mover to change the aperture opening size. The SMA assembly includes a first SMA wire portion and a second SMA wire portion disposed opposite to each other, with one end of the first SMA wire portion and the other end connected to a positive and negative electrode, respectively. The deformation of the first SMA wire portion and the second SMA wire portion after being energized jointly drives the mover to move.

Description

Technical Field

[0001] This invention relates to aperture driving devices, photographic devices, and electronic devices. Background Technology

[0002] Small camera devices are commonly found in electronic devices such as smartphones and tablets. In variable aperture cameras suitable for these small cameras, the light intensity corresponding to the lens is adjusted by changing the size of the aperture opening, thereby improving the image quality.

[0003] Current methods for driving variable apertures include using shape memory alloys (hereinafter referred to as SMA in this application).

[0004] However, current SMA-based solutions suffer from low drive efficiency. For example... Figure 1 As shown, in one comparative embodiment, the aperture driving device 10a includes a stator 1a, a mover 2a, and an SMA assembly 3a, generally comprising a first SMA assembly 31a and a second SMA assembly 32a with opposite directions of movement. The mover 2a provides an aperture opening with a variable size. The SMA assembly 3a is connected to the mover 2a to drive the mover 2a to move and change the size of the aperture opening, thereby adjusting the illumination intensity corresponding to the lens of the photographic device and improving the photographic quality of the device.

[0005] like Figure 1 As shown, a single SMA assembly 3a generally includes an SMA wire 301a. The SMA wire 301a is connected to the stator 1a at one end via a stator fixed end 51a, and to the mover 2a at the other end via a mover fixed end 52a. Conductive terminals are led out from the mover fixed end 52a and the stator fixed end 51a, respectively. The conductivity of the mover fixed end 52a needs to be led out through a conductive metal, for example... Figure 1 The conductive metal spring 53a shown.

[0006] The inventors discovered that, for those using Figure 1 The driving efficiency of the comparative scheme shown in the example needs further improvement. Utility Model Content

[0007] The purpose of this application is to provide an aperture driving device, a photographic device, and an electronic device with high driving efficiency.

[0008] An aperture driving device according to a first aspect of this application includes: a stator providing a stator opening; a mover providing an aperture opening with a variable size, the aperture opening being located within the range of the stator opening; and an SMA assembly connected to the mover to drive the mover to move and change the aperture opening size; wherein the SMA assembly includes a first SMA wire portion and a second SMA wire portion disposed opposite to each other, the first SMA wire portion and the second SMA wire portion being conductive at one end and connected to a positive electrode and a negative electrode respectively at the other end, the deformation of the first SMA wire portion and the second SMA wire portion after being energized jointly driving the mover to move, the first SMA wire portion and the second SMA wire portion of the SMA assembly being provided by a single SMA wire, the single SMA wire being wound around a positioning post at one end, such that the single SMA wire forms the first SMA wire portion and the second SMA wire portion disposed opposite to each other on both sides of the positioning post.

[0009] In some embodiments of the aperture driving device, the positioning post is fixedly connected to the moving part.

[0010] In some embodiments of the aperture driving device, the other ends of the first SMA line portion and the second SMA line portion are respectively connected to a first terminal and a second terminal, such that the first SMA line portion and the second SMA line portion are installed and fixed separately at the other end. One of the first terminal and the second terminal is connected to the positive terminal and the other is connected to the negative terminal. Both the first terminal and the second terminal are connected to the stator or the mover.

[0011] In some embodiments of the aperture driving device, the first SMA line portion and the second SMA line portion are substantially parallel.

[0012] In some embodiments of the aperture driving device, there are multiple SMA components, including at least a first SMA component and a second SMA component. The deformation of the first SMA component and / or the second SMA component drives the mover to move, thereby increasing or decreasing the size of the aperture opening.

[0013] In some embodiments of the aperture driving device, the first SMA component is arranged around a first positioning post at one end, and the first SMA component is arranged around a second positioning post at one end, with the positions of the first SMA component and the second SMA component being axially symmetrical.

[0014] In some embodiments of the aperture driving device, the mover includes a blade assembly and a moving ring. When the SMA assembly is energized, its deformation drives the moving ring to rotate, thereby driving the blade assembly to move and change the size of the aperture opening.

[0015] A photographic apparatus according to a second aspect of this application has the aperture driving device described in the first aspect.

[0016] An electronic device according to a third aspect of this application has the photographic apparatus described in the second aspect. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of an aperture driving device for a comparative scheme.

[0018] Figure 2 This is a schematic diagram of an electronic device having a photographic apparatus according to some embodiments of this application.

[0019] Figure 3 This is a schematic diagram of an aperture driving device according to some embodiments of this application.

[0020] Figure 4 This is a schematic diagram of the stator of an aperture driving device according to some embodiments of this application.

[0021] Figures 5A to 5C This is a schematic diagram of the structure of the rotor blades and the stator components for connecting the rotor blades to the rotor blades in some embodiments of this application.

[0022] Symbol Explanation

[0023] 100-Photographic Device

[0024] 200-Electronic Devices

[0025] 10-Aperture drive device

[0026] 1-Stator

[0027] 11-Stator opening

[0028] 12-Slide

[0029] 13-Receiving tank

[0030] 14-Outer shell

[0031] 15-Legs

[0032] 16-slot

[0033] 2-Motor

[0034] 21-blade assembly

[0035] 211-blade

[0036] 210-Aperture Opening

[0037] 22-Dynamic Ring

[0038] 221-First Shaft

[0039] 23-Connecting Arm

[0040] 231-Arm Body

[0041] 232-Second Shaft

[0042] 3-SMA components

[0043] 31-First SMA Component

[0044] 32-Second SMA Component

[0045] 301-First SMA line section

[0046] 302-Second SMA line section

[0047] 4-Positioning Post

[0048] 41-First Positioning Post

[0049] 42-Second Positioning Post

[0050] 51-First Terminal

[0051] 52-Second Terminal

[0052] 6-Central axis. Detailed Implementation

[0053] An embodiment of the present invention will now be described with reference to the accompanying drawings. The following embodiments illustrate the aperture driving device, photographic apparatus, and electronic device of the present invention by way of example; however, the present invention is not intended to be limited to these embodiments.

[0054] like Figure 2 As shown, the camera device 100 can be housed within the frame of an electronic device 200, such as a smartphone. The camera device 100 has a variable aperture, and the aperture drive device 10, which will be described in detail in the following embodiments, changes the size of the aperture opening of the variable aperture, thereby adjusting the light intensity corresponding to the lens of the camera device 100, thereby improving the image quality of the camera device.

[0055] like Figure 3 As shown, the aperture drive device 10 includes a stator 1, a mover 2, and an SMA assembly 3. The stator 1 provides a stator opening 11, and the mover 2 provides an aperture opening 210 with a variable opening size, the aperture opening 210 being located within the range of the stator opening 11. The SMA assembly is connected to the mover 2 to drive the mover 2 to move and change the opening size of the aperture opening 210. The stator and mover here have similar meanings to those commonly used in the art; they are relative concepts, with the stator remaining fixed during operation and the mover moving relative to the stator during operation. The stator 1 may include a housing 14, and axially, a front cover plate may be provided on one side of the stator 1 and a rear cover plate on the other side, such that the space defined by the housing 14, the front cover plate, and the rear cover plate accommodates the mover 2 and the SMA assembly 3.

[0056] exist Figure 3 In order to clearly show the mounting relationship of the SMA component 3 within the aperture drive device 10, only the movement 2, which may include the blade assembly 21 and the moving ring 22, is shown. The specific structure of the movement 2 and the stator 1 will be described in some embodiments below, in conjunction with... Figure 4 as well as Figures 5A to 5C Further details will be provided. However, it can be understood that the specific structures of mover 2 and stator 1 are not based on... Figures 3 to 5C The content shown is for limitation purposes, and the structure relating to the relative motion between the mover 2 and the stator 1 is not the inventive point of this application. The descriptions of the mover 2 and stator 1 in the embodiments and accompanying drawings are only for illustrating one or more exemplary application scenarios of the SMA component 3. The SMA component 3 can be used to drive stators 1 and movers 2 of other structures to change the size of the aperture opening 210. The principle by which the SMA component 3 can contract in the aperture driving device 10 can be a shape memory effect obtained through thermoelasticity and martensitic phase transformation and its inverse, which is common in the art. In the application scenario of this application, when the SMA component is energized, the current causes the SMA to undergo a resistance heating effect, which raises the temperature of the SMA and causes it to contract. The amount of contraction can be controlled by controlling the magnitude of the current. It can be understood that, generally speaking, the above-mentioned deformation of the SMA component 3 drives the movement of the mover 2, which is the contraction of the SMA to drive the movement of the mover 2, but the possibility of the SMA component 3 elongating to drive the movement of the mover 2 is not excluded. In addition, the movement of the mover 2 can be Figure 3 The rotation of the moving ring 22 shown in the figure can also be used to change the size of the aperture opening by moving the mover.

[0057] like Figure 3As shown, in some embodiments, the number of SMA components 3 is generally multiple, including at least a first SMA component 31 and a second SMA component 32. The deformation of the first SMA component 31 and / or the movement of the mover 2 causes the aperture opening 210 to increase or decrease in size. The direction of movement of the mover 2 caused by the deformation of the first SMA component 31 is opposite to the direction of movement of the mover 2 caused by the deformation of the second SMA component 32. For example, in some embodiments, the first SMA component 31 may contract and cause the mover 2 to rotate counterclockwise, while the second SMA component 32 may contract and cause the mover 2 to rotate clockwise. Therefore, in some embodiments, when the mover 2 needs to rotate counterclockwise, the first SMA component 31 may be energized while the second SMA component 32 may not be energized, i.e., the first SMA component 31 alone contracts and causes the mover 2 to rotate counterclockwise; while when the mover 2 needs to rotate clockwise, the second SMA component 32 may be energized while the first SMA component 31 may not be energized, i.e., the second SMA component 32 alone contracts and causes the mover 2 to rotate clockwise. However, this is not a limitation. For example, in some embodiments, when the mover 2 needs to rotate counterclockwise, the first SMA component 31 is energized and the second SMA component 32 is energized, but the current energized by the first SMA component 31 is greater than the current energized by the second SMA component 32, so that the amount of contraction (contraction force) of the first SMA component 31 is greater than that of the second SMA component 31, causing the mover 2 to be driven to rotate counterclockwise; while when the mover 2 needs to rotate clockwise, the current energized by the second SMA component 32 is greater than the current energized by the first SMA component 31, so that the amount of contraction (contraction force) of the second SMA component 32 is greater than that of the first SMA component 31, causing the mover 2 to be driven to rotate clockwise. In addition, the above description includes at least the first SMA component 31 and the second SMA component 32, which means that there is at least one SMA component in different rotation directions. It is not limited to the case shown in the figure where only one SMA component is set in one rotation direction. For example, more SMA components can be set in one rotation direction. In addition, the number of SMA components in different rotation directions is generally equal. That is, for example, two or more SMA components can be set in the direction of driving counterclockwise rotation and two or more SMA components can be set in the direction of driving clockwise rotation.

[0058] Continue to refer to Figure 3 As shown, different Figure 1In the comparative scheme shown, the SMA component 3 of the embodiment includes a first SMA wire portion 301 and a second SMA wire portion 302 disposed opposite to each other. The first SMA wire portion 301 and the second SMA wire portion 302 are conductive at one end, and the other ends are respectively connected to the positive and negative terminals. The deformation of the first SMA wire portion 301 and the second SMA wire portion 302 after being energized jointly drives the mover 2 to move. Specifically, the connection structure can be that one end of the first SMA wire portion 301 and the second SMA wire portion 302 is connected to the mover 2, and the other end is connected to the stator 1, so that the first SMA wire portion 301 and the second SMA wire portion 302 contract or extend after being energized, driving the mover 2 to move relative to the stator 1.

[0059] The beneficial effects of the aperture driving device 10 described in the above embodiments include, but are not limited to, those different from, Figure 1 The comparative scheme shown, the scheme of the embodiment, when occupying the same length space, the SMA component 3 of the embodiment is provided with opposing first SMA line portions 301 and second SMA line portions 302 within the length range, and substantially multiple SMA lines providing driving force are provided within the same length range, instead of as Figure 1 The diagram shows only a single SMA line. Firstly, this allows multiple SMA lines to work together to provide the driving force for the actuator under the same current, providing a greater driving force and improving driving efficiency. In some embodiments, such as... Figure 3 As shown, the structure of the first SMA line portion 301 and the second SMA line portion 302 arranged opposite to each other can be as follows: Figure 3 The structure shown, in which the first SMA line portion 301 and the second SMA line portion 302 are substantially parallel, can thus provide a structure that is comparable to... Figure 1 The structure of a single SMA line shown essentially provides twice the driving force. Here, "essentially parallel" means parallel with a certain degree of parallelism error allowed, such as 0° to 5°. It can be understood that the relative arrangement is not limited to parallelism and can be adjusted according to actual spatial requirements. For example, the extensions of the two lines could intersect to form an angle. However, generally speaking, a structure where the first SMA line portion 301 and the second SMA line portion 302 are essentially parallel generally has higher driving efficiency.

[0060] Furthermore, the beneficial effects of the aperture driving device 10 described in the above embodiments also include, but are not limited to, the first SMA line 301 and the second SMA line 302 being connected at one end, and the current loop formed by the SMA component 3 being from the positive terminal to the first SMA line 301, to the second SMA line 302, and then to the negative terminal, thus eliminating the need for... Figure 1As shown, an additional conductive metal, such as a conductive metal spring 53a, is required to lead out the follower fixed end 52a for conducting electricity. That is, the aperture drive device 10 may not have a conductive metal follower fixed end 52a leading out, such as a conductive metal spring 53a, thereby further simplifying the structure of the aperture drive device 10, saving material costs and simplifying the assembly process.

[0061] Continue to refer to Figure 3 As shown, the structure in which the first SMA wire portion 301 and the second SMA wire portion 302 are conductive at one end can be... Figure 3 The structure shown uses a positioning post 4. Specifically, the first SMA wire portion 301 and the second SMA wire portion 302 of the SMA component 3 are provided by a single SMA wire. This single SMA wire is wound around a positioning post 4 at one end, so that the single SMA wire forms the first SMA wire portion 301 and the second SMA wire portion 302 oppositely arranged on both sides of the positioning post 4. The structure using the positioning post 4 is simple, and only a single SMA wire needs to be wound during assembly. The positioning post 4 can be fixedly connected to the mover 2. For example, the positioning post 4 and the moving ring 22 of the mover 2 can be integrally formed. For example, the mover 2 and the positioning post 4 can be injection molded as one piece, but this is not a limitation. They can also be detachably fixedly connected.

[0062] Continue to refer to Figure 3 As shown, in some embodiments, the terminal structure where the first SMA wire portion 301 and the second SMA wire portion 302 are respectively connected to the positive and negative terminals at their other ends can be such that the other ends of the first SMA wire portion 301 and the second SMA wire portion 302 are respectively connected to the first terminal 51 and the second terminal 52, so that the first SMA wire portion 301 and the second SMA wire portion 302 are installed and fixed separately at their other ends. One of the first terminal 51 and the second terminal 52 is connected to the positive terminal and the other is connected to the negative terminal. Both the first terminal 51 and the second terminal 52 are connected to the stator 1, or both are connected to the mover 2. The beneficial effects of this are described in reference [reference needed]. Figure 1 The comparative scheme shown has its two terminals connected to the stator and rotor respectively. Specifically, the SMA line 301a is connected to the stator 1a at one end via the stator fixed end 51a, and to the rotor 2a at the other end via the rotor fixed end 52a. In contrast, the embodiment uses both the first terminal 51 and the second terminal 52 connected to either the stator 1 or the rotor 2. For example... Figure 3 All of the terminals shown are connected to the stator 1. During assembly, the terminals are all located in the same component (mover 2 or stator 1), eliminating the need for separate terminals on the stator 1 and mover 2, further simplifying the assembly process. In some embodiments, refer to... Figure 3 as well as Figure 4As shown, the other ends of the first SMA line portion 301 and the second SMA line portion 302 are respectively connected to the first terminal 51 and the second terminal 52, which are both connected to the stator 1. In this specific structure, the first terminal 51 and the second terminal 52 can be connected around the legs 15 of the radial edge of the outer shell 14 of the stator 1. Such a connection structure is more reliable.

[0063] Continue to refer to Figure 3 As shown, in some embodiments, for a structure in which multiple SMA components are provided with opposite directions of movement, the specific structure may be that the first SMA component 31 is wound around the first positioning post 41 at one end, and the second SMA component 32 is wound around the second positioning post 42 at one end. The positions of the first SMA component 31 and the second SMA component 32 are axially symmetrical, for example in... Figure 3 In the embodiment shown, the positions of the first SMA component 31 and the second SMA component 32 are symmetrical about the central axis of the aperture drive device 10. The advantage of this is that the driving forces provided by the first SMA component 31 and the second SMA component 32 for opposite movements are basically the same, which is beneficial to the overall stability of the aperture drive device 10.

[0064] refer to Figure 4 as well as Figures 5A to 5C As shown, in some embodiments, the structure for the mover 2 to change the size of the aperture opening 210 can be that the mover 2 includes a blade assembly 21 and a moving ring 22. After the SMA assembly 3 is energized, it deforms and drives the moving ring 22 to rotate, thereby driving the blade assembly 21 to move and change the size of the aperture opening 210. The aperture opening 210 is located within the range of the stator opening 11. Specifically, the blade assembly 21 may include multiple blades 211, which surround to form an aperture opening 210. The multiple blades 211 of the blade assembly 21 are all connected to the mover 2, and the blade assembly 21 is movably connected to the stator 1. That is, the blade assembly 21 can move relative to the stator 1 to change the motion transmission path of the aperture opening 210. When the SMA assembly 3 is energized, the first SMA line portion 301 and the second SMA line portion 302 contract simultaneously, driving the moving ring 22 of the mover 2, which is fixedly connected to the SMA assembly 3, to rotate. The rotation of the moving ring 22 drives the movement of the multiple blades 211 connected to the moving ring 22, so that the size of the aperture opening 210 formed by the multiple blades 211 changes.

[0065] refer to Figures 5A to 5CAs shown, the specific structure of the stator 1 and the mover 2 can be such that, in some embodiments, the stator 1 is provided with a slide rail 12, and the relative sliding of the first shaft member 222 with the slide rail 12 allows the blade 211 to be movably connected to the stator 1; the moving ring 22 has a first connecting hole 221, and the first shaft member 222 passes through the slide rail 12 axially and is connected to the first connecting hole 221, so that the moving ring 22 is connected to the blade 211, allowing the blade 21 to rotate relative to the moving ring 22. As shown in Figure 5, for the eight blades 211, there are also eight first connecting holes 221. That is, for the first shaft member 222 fixed to the blade 211, the first shaft member 222, in its structural relationship with the stator 1, is equivalent to a sliding block, sliding relative to the track defined by the slide rail 12, while in its structural relationship with the moving ring 22, the first shaft member 222 is equivalent to a connector, and the blade 211 and the moving ring 22 can be connected to each other relatively rotatably through the shaft hole, so that the movement of the first rotating ring 3 can be synchronously transmitted to the blade 211.

[0066] Continue to refer to Figure 5C As shown, in some embodiments, the mover 1 is provided with multiple receiving slots 13. Each blade 211 is connected to the stator 1 at one end via a connecting arm 23. The connecting arm 23 includes an arm body 231 and a first shaft 222 and a second shaft 232 disposed on the arm body 231. The second shaft 232 is connected to the stator 1 via a connecting slot 16. The specific structure of the slot 16 can be an inclined slot or an arc-shaped slot. A slide rail 12 is provided in the receiving slot 13. The slide rail 12 is an arc-shaped slide rail. The blade 21 rotates around its corresponding second shaft 232. The relative motion of the blade 211 and the stator 1 is such that while the blade 211 slides along the circumference of the stator 1 driven by the passive ring 22, the blade 211 rotates around the first shaft 222 due to the limiting and guiding effect of the slot 16 provided on the stator 1, thereby realizing opening and closing, so that the blade assembly 21 can move relative to the stator 1 to change the area of ​​the aperture opening 210. It can be understood that... Figure 5A , Figure 5B The number of leaves shown is 8, which is just an example and can be adjusted according to actual needs. Additionally, Figure 5C To more clearly illustrate the specific structure and connection relationship between blade 21 and stator 1 in some embodiments, Figure 5C Only one leaf 21 was selected from the eight leaves and is shown in the figure.

[0067] Although the aperture drive device 10 used in the photographic apparatus 100 has been described in the above-described embodiments, the aperture drive device 10 can also be applied to other optical devices.

Claims

1. An aperture drive device (10) characterized by, include: Stator (1), providing stator opening (11); The mover (2) provides an aperture opening (210) with a variable aperture size, the aperture opening (210) being located within the range of the stator opening (11); SMA component (3) is connected to the mover (2) to drive the mover (2) to move and change the size of the aperture opening (210); The SMA component (3) includes a first SMA wire section (301) and a second SMA wire section (302) arranged opposite to each other. The first SMA wire section (301) and the second SMA wire section (302) are connected at one end and connected to the positive and negative poles respectively at the other end. The deformation of the first SMA wire section (301) and the second SMA wire section (302) after being energized jointly drives the mover (2) to move. The first SMA line portion (301) and the second SMA line portion (302) of the SMA component (3) are provided by a single SMA line. The single SMA line is wound around a positioning post (4) at one end, so that the single SMA line forms the first SMA line portion (301) and the second SMA line portion (302) arranged opposite to each other on both sides of the positioning post (4).

2. The aperture drive device (10) as claimed in claim 1, characterized in that The positioning post (4) is fixedly connected to the moving part (2).

3. The aperture drive device (10) as claimed in claim 1, characterized in that The other ends of the first SMA wire section (301) and the second SMA wire section (302) are respectively connected to the first terminal (51) and the second terminal (52) so that the first SMA wire section (301) and the second SMA wire section (302) are installed and fixed separately at the other end. One of the first terminal (51) and the second terminal (52) is connected to the positive pole and the other is connected to the negative pole. Both the first terminal (51) and the second terminal (52) are connected to the stator (1) or the mover (2).

4. The aperture drive device (10) as claimed in claim 1, characterized in that The first SMA line portion (301) and the second SMA line portion (302) are substantially parallel.

5. The aperture drive device (10) as claimed in claim 1, characterized in that The number of SMA components (3) is multiple, including at least a first SMA component (31) and a second SMA component (32). The deformation of the first SMA component (31) and / or the second SMA component (32) drives the mover (2) to move, thereby increasing or decreasing the size of the aperture opening (210).

6. The aperture drive device (10) as claimed in claim 5, characterized in that The first SMA component (31) is located around the first positioning post (41) at one end, and the first SMA component (31) is located around the second positioning post (42) at one end. The positions of the first SMA component (31) and the second SMA component (32) are axially symmetrical.

7. The aperture drive device (10) as claimed in claim 1, characterized in that The mover (2) includes a blade assembly (21) and a moving ring (22). When the SMA assembly (3) is powered on, it deforms and drives the moving ring (22) to rotate, thereby driving the blade assembly (21) to move and change the size of the aperture opening (210).

8. A photographic device (100), characterized in that It has an aperture driving device (10) as described in any one of claims 1 to 7.

9. An electronic device (200), characterized by It has the photographic apparatus (100) as described in claim 8.

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