Aperture assembly and projection device

Abstract

The invention discloses an aperture assembly and a projection device. The aperture assembly comprises a base, a plurality of movable blades, a first SMA driving line and a second SMA driving line. The base is provided with a light hole. The multiple movable blades are arranged in the circumferential direction of the light hole and movably connected with the base so as to move between a first position and a second position relative to the base. And the covering area of the plurality of movable blades on the light-transmitting hole at the first position is smaller than the covering area of the plurality of movable blades on the light-transmitting hole at the second position. The first SMA driving line is connected with the multiple movable blades and used for deforming in the driving state so as to drive the multiple movable blades to move from the first position to the second position. The second SMA driving line is connected with the multiple movable blades and used for deforming in the driving state so as to drive the multiple movable blades to move from the second position to the first position. In this way, the structure of the aperture assembly can be simplified.

Description

Technical Field

[0001] The present application relates to the technical field of optical devices, and particularly to an aperture assembly and a projection device. Background Art

[0002] In an office scenario, projection devices are widely used, which bring convenience to people's work. A projection device often includes an aperture assembly, and the aperture assembly can be used to adjust the amount of light emitted by the projection device externally, thereby improving the projection imaging effect. In addition, the aperture assembly can also be applied to a camera device.

[0003] The aperture assembly needs power to drive the aperture adjustment. Currently, in the prior art, the aperture assembly often uses a motor formed by a stator and a rotor as a power source, and the motor structure is relatively complex, which makes the aperture assembly structure also relatively complex. Summary of the Invention

[0004] The main technical problem to be solved by the present application is to provide an aperture assembly and a projection device, which can simplify the structure of the aperture assembly.

[0005] To solve the above technical problem, the first technical solution adopted by the present application is: to provide an aperture assembly, which includes a base, a plurality of movable blades, a first SMA drive wire, and a second SMA drive wire. The base has a light-transmitting hole. The plurality of movable blades are arranged along the circumference of the light-transmitting hole and are respectively movably connected to the base so as to be able to move between a first position and a second position relative to the base. The covering area of the light-transmitting hole by the plurality of movable blades in the first position is smaller than that in the second position. The first SMA drive wire is connected to the plurality of movable blades and is used to deform in a driving state to drive the plurality of movable blades to move from the first position to the second position. The second SMA drive wire is connected to the plurality of movable blades and is used to deform in a driving state to drive the plurality of movable blades to move from the second position to the first position.

[0006] To solve the above technical problem, the second technical solution adopted by the present application is: to provide a projection device, which includes the aperture assembly provided by the first technical solution, a lens, and a projection light source. The lens is disposed opposite to the light-transmitting hole of the aperture assembly. The light emitted by the projection light source enters the lens through the light-transmitting hole and forms an image in the external environment.

[0007] The beneficial effects of the present application are as follows: Different from the prior art, the aperture assembly includes a base, a plurality of movable blades, a first SMA drive wire, and a second SMA drive wire. The base has a light-transmitting hole. The plurality of movable blades are arranged circumferentially along the light-transmitting hole and are respectively movably connected to the base so as to be able to move relative to the base between a first position and a second position. The covering area of the light-transmitting hole by the plurality of movable blades in the first position is smaller than that in the second position. The first SMA drive wire is connected to the plurality of movable blades and is used to deform in the driving state to drive the plurality of movable blades to move from the first position to the second position. The second SMA drive wire is connected to the plurality of movable blades and is used to deform in the driving state to drive the plurality of movable blades to move from the second position to the first position. By adjusting the amount of light through the aperture assembly, the brightness of the obtained image can be adjusted, thereby improving the projection effect. The setting of the first SMA drive wire and the second SMA drive wire can improve the evenness of the force on the plurality of movable blades, which is beneficial to improving the linkage and synchronism of the movement of the plurality of movable blades between the first position and the second position, and can simplify the structure of the aperture assembly, which is beneficial to improving the automation degree of the aperture assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 is a schematic structural diagram of the first SMA drive wire drive in the aperture assembly embodiment of the present application;

[0009] Figure 2 is Figure 1 a schematic structural diagram of the first SMA drive wire shown;

[0010] Figure 3 is a schematic structural diagram of the second SMA drive wire drive in the aperture assembly embodiment of the present application;

[0011] Figure 4 is a schematic structural diagram of the combined drive of the first SMA drive wire and the second SMA drive wire in the aperture assembly embodiment of the present application;

[0012] Figure 5 is a schematic diagram of the relationship between the energizing current and time of the first SMA drive wire and the second SMA drive wire of the present application;

[0013] Figure 6 is a schematic structural diagram of the connection structure between the base and the movable blade of the present application;

[0014] Figure 7 is a schematic structural diagram of the base of the present application;

[0015] Figure 8 is a schematic diagram of the comparison of the circuit connection structures of the first SMA drive wire and the second SMA drive wire of the present application;

[0016] Figure 9 is Figure 4Schematic diagram of the structure of the second SMA drive line shown

[0017] Figure 10 Another schematic diagram of the cooperation and drive of the first SMA drive line and the second SMA drive line in the aperture component embodiment of the present application

[0018] Figure 11 Another schematic diagram of the base of the present application

[0019] Figure 12 Schematic diagram of the structure of the projection device embodiment of the present application Detailed implementation manners

[0020] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0021] After long-term research, the inventor of the present application found that a projection device often includes an aperture component, and the aperture component can be used to adjust the amount of light emitted by the projection device externally, thereby improving the projection imaging effect. The aperture component needs power to drive to adjust the aperture. At present, in the prior art, a motor formed by a stator and a rotor is often used as a power source, and the structure of the motor is relatively complex, which makes the structure of the aperture component also relatively complex. To solve this technical problem, the following embodiments are provided in the present application.

[0022] As Figures 1 to 4 shown, the aperture component 100 described in the aperture component embodiment of the present application includes a base 110, a plurality of movable vanes 120, a first SMA drive line 130, and a second SMA drive line 140. The base 110 has a light-transmitting hole 111. The plurality of movable vanes 120 are arranged along the circumference of the light-transmitting hole 111 and are respectively movably connected to the base 110 so as to be able to move between a first position and a second position relative to the base 110. The covering area of the light-transmitting hole 111 by the plurality of movable vanes 120 in the first position is smaller than that in the second position. The first SMA drive line 130 is connected to the plurality of movable vanes 120 and is used to deform in a driving state to drive the plurality of movable vanes 120 to move from the first position to the second position. The second SMA drive line 140 is connected to the plurality of movable vanes 120 and is used to deform in a driving state to drive the plurality of movable vanes 120 to move from the second position to the first position.

[0023] In some embodiments, the base 110 has an outer peripheral side surface 113, and at least a portion of the second SMA driving wire 140 is closer to the outer peripheral side surface 113 than the first SMA driving wire 130. Thus, the second SMA driving wire 140 can obtain a larger installation space, facilitating the installation of the second SMA driving wire 140 and allowing for a more diverse setting of the structural shape of the second SMA driving wire 140. In other embodiments, the base 110 has an outer peripheral side surface 113, and at least a portion of the second SMA driving wire 140 is farther from the outer peripheral side surface 113 than the first SMA driving wire 130.

[0024] In some embodiments, the plurality of movable vanes 120 completely cover the light-transmitting holes 111 in the second position. In other embodiments, the plurality of movable vanes 120 partially cover the light-transmitting holes 111 in the second position.

[0025] The projection device 10 can emit light to the outside world, thereby forming a projection image. The aperture assembly 100 can be applied to the projection device 10. For the projection device 10, the amount of light can be adjusted through the aperture assembly 100 to adjust the brightness and contrast of the projected image, thereby improving the projection effect.

[0026] The light-transmitting holes 111 of the base 110 allow light to pass through, enabling the light to pass through the lens 200 of the projection device 10 and be projected to the outside world. Inside the aperture assembly 100, the first SMA driving wire 130 and the second SMA driving wire 140 can provide power for the movement of the plurality of movable vanes 120, enabling the plurality of movable vanes 120 to adjust the covering area of the light-transmitting holes 111. By adjusting the covering area of the light-transmitting holes 111, the aperture assembly 100 can adjust the amount of light passing through the lens 200 of the projection device 10.

[0027] The first SMA driving wire 130 can be prepared from a shape memory alloy (SMA for short) or other shape memory materials. The first SMA driving wire 130 can deform under the action of force or temperature change, and can return to its initial shape under the action of force or temperature change after deformation. For example, the first SMA driving wire 130 can undergo tensile deformation under mechanical tension, and can be electrically heated after the tensile deformation to return to the shape before the tension.

[0028] When the multiple movable vanes 120 are in the first position, the covering area of the light-transmitting hole 111 is small, and the light-transmitting hole 111 allows more light to pass through the lens 200 of the projection device 10. When the multiple movable vanes 120 are in the second position, the covering area of the light-transmitting hole 111 is large, and the light-transmitting hole 111 allows less light to pass through the lens 200 of the projection device 10. For example, when the multiple movable vanes 120 are in the first position, the radial dimension of the un-covered part of the light-transmitting hole 111 is greater than the radial dimension of the un-covered part of the light-transmitting hole 111 when the multiple movable vanes 120 are in the second position.

[0029] By providing the first SMA driving wire 130 to connect and drive the multiple movable vanes 120, the first SMA driving wire 130 can drive the movement of the multiple movable vanes 120, which can improve the evenness of the force on the multiple movable vanes 120, is beneficial to improving the linkage and synchronism of the multiple movable vanes 120 moving from the first position to the second position, and can simplify the structure of the aperture assembly 100.

[0030] The deformation of the first SMA driving wire 130 can be reflected as a change in the length of the first SMA driving wire 130, and the length of the first SMA driving wire 130 can automatically change when entering the driving state. When the multiple movable vanes 120 are in the first position, the distance between each movable vane 120 and the light-transmitting center position of the light-transmitting hole 111 is greater. When the multiple movable vanes 120 are in the second position, the distance between each movable vane 120 and the light-transmitting center position of the light-transmitting hole 111 is smaller.

[0031] When the first SMA driving wire 130 shortens in length due to entering the driving state, the distance between the first SMA driving wire 130 and the light-transmitting center position of the light-transmitting hole 111 will decrease, and drive the multiple movable vanes 120 to move from the first position to the second position, thereby driving the minimum distance between each movable vane 120 and the light-transmitting center position of the light-transmitting hole 111 to decrease, so as to correspondingly increase the covering area of the light-transmitting hole 111.

[0032] In some other embodiments, when the length of the first SMA driving wire 130 elongates, the distance between the first SMA driving wire 130 and the light-transmitting center position of the light-transmitting hole 111 will decrease, and drive the multiple movable vanes 120 to move from the first position to the second position.

[0033] By controlling the deformation of the first SMA driving wire 130, the aperture assembly 100 can adjust and control the amount of light passing through the light-transmitting hole 111, thereby improving the automation degree of the aperture assembly 100.

[0034] Optionally, as Figure 1 shown, the number of the multiple movable vanes 120 is 3 or more. For example, the number of the movable vanes 120 is 6, 8, 10, 13, 16 or 20.

[0035] Optionally, as Figure 2 shown, the shape of the first SMA driving wire 130 may be an inscribed polygon of a preset circle X. For example, the shape of the first SMA driving wire 130 may be an inscribed triangle, an inscribed pentagon or an inscribed hexadecagon of the preset circle X. Alternatively, the shape of a part of the first SMA driving wire 130 is a part of an inscribed polygon of the preset circle X.

[0036] Optionally, the number of the first SMA driving wires 130 is at least one, and each of the first SMA driving wires 130 extends along the circumferential direction of the light-transmitting hole 111 and connects a plurality of movable vanes 120.

[0037] Optionally, when there are multiple first SMA driving wires 130, the multiple first SMA driving wires 130 are distributed along the circumferential direction of the light-transmitting hole 111 so as to apply a driving force to the movable vanes 120.

[0038] Optionally, the number of the second SMA driving wires 140 is at least one, and each of the second SMA driving wires 140 extends along the circumferential direction of the light-transmitting hole 111 and connects a plurality of movable vanes 120.

[0039] Optionally, when there are multiple second SMA driving wires 140, the multiple second SMA driving wires 140 are distributed along the circumferential direction of the light-transmitting hole 111 so as to apply a driving force to the movable vanes 120.

[0040] In some embodiments, the first SMA driving wire 130 sequentially connects a plurality of movable vanes 120 along the circumferential direction of the light-transmitting hole 111. The first SMA driving wire 130 is configured to deform in a direction close to the light-transmitting center position in a driving state, so as to drive the plurality of movable vanes 120 to move from the first position to the second position. The second SMA driving wire 140 sequentially connects a plurality of movable vanes 120 along the circumferential direction of the light-transmitting hole 111. At least a part of the second SMA driving wire 140 is disposed around the first SMA driving wire 130. The second SMA driving wire 140 is configured to deform in a direction away from the light-transmitting center position in a driving state, so as to drive the plurality of movable vanes 120 to move from the second position to the first position.

[0041] The second SMA driving wire 140 may be made of a shape memory alloy (SMA for short) or other shape memory materials. The second SMA driving wire 140 can deform under the action of force or temperature change, and can return to the initial shape under the action of force or temperature change after deformation. For example, the second SMA driving wire 140 can undergo a tensile deformation when mechanically stretched, and can be electrically heated after the tensile deformation, so as to return to the shape before stretching.

[0042] The deformation of the second SMA driving wire 140 can be reflected as a change in the length of the second SMA driving wire 140, and the length of the second SMA driving wire 140 can change when it enters the driving state. When the length of the second SMA driving wire 140 changes due to entering the driving state, the distance between the second SMA driving wire 140 and the light-transmitting center position of the light-transmitting hole 111 will increase, thereby driving the minimum distance between each movable blade 120 and the light-transmitting center position of the light-transmitting hole 111 to increase correspondingly, so as to correspondingly reduce the covering area of the light-transmitting hole 111.

[0043] By setting the second SMA driving wire 140 to connect and drive multiple movable blades 120, the force application uniformity of the multiple movable blades 120 can be improved, which is beneficial to improving the linkage and synchronization of the multiple movable blades 120 moving from the second position to the first position, and can simplify the structure of the aperture assembly 100.

[0044] By controlling the deformation of the second SMA driving wire 140, the aperture assembly 100 can adjust and control the amount of light passing through the light-transmitting hole 111. The first SMA driving wire 130 and the second SMA driving wire 140 can cooperate with each other to drive multiple movable blades 120 to switch between the first position and the second position, facilitating the projection device 10 to adjust the amount of light passing through the aperture assembly 100 according to different application requirements, thereby improving the automation degree of the aperture assembly 100.

[0045] The aperture assembly 100 includes a base 110, multiple movable blades 120, a first SMA driving wire 130 and a second SMA driving wire 140. The base 110 has a light-transmitting hole 111. The multiple movable blades 120 are arranged along the circumference of the light-transmitting hole 111 and are respectively movably connected to the base 110 so as to be able to move between a first position and a second position relative to the base 110. The covering area of the light-transmitting hole 111 by the multiple movable blades 120 in the first position is smaller than that in the second position. The first SMA driving wire 130 connects the multiple movable blades 120 and is used to deform in the driving state to drive the multiple movable blades 120 to move from the first position to the second position. The second SMA driving wire 140 connects the multiple movable blades 120 and is used to deform in the driving state to drive the multiple movable blades 120 to move from the second position to the first position. By adjusting the amount of light through the aperture assembly 100, the brightness of the obtained image can be adjusted, thereby improving the projection effect. Setting the first SMA driving wire 130 and the second SMA driving wire 140 can improve the force application uniformity of the multiple movable blades 120, which is beneficial to improving the linkage and synchronization of the multiple movable blades 120 moving between the first position and the second position, and can simplify the structure of the aperture assembly 100, which is beneficial to improving the automation degree of the aperture assembly 100.

[0046] When the first SMA driving wire 130 enters the driving state, the second SMA driving wire 140 may not be in the driving state. When the second SMA driving wire 140 enters the driving state, the first SMA driving wire 130 may not be in the driving state.

[0047] Specifically, the first SMA driving wire 130 and the second SMA driving wire 140 enter the driving state when powered on respectively. Powering on the first SMA driving wire 130 can drive a plurality of movable vanes 120 to move from the first position to the second position, and during this process, the second SMA driving wire 140 is in the powered-off state. After the plurality of movable vanes 120 move to the second position and remain in the second position, both the first SMA driving wire 130 and the second SMA driving wire 140 are in the powered-off state. Powering on the second SMA driving wire 140 can drive a plurality of movable vanes 120 to move from the second position to the first position, and during this process, the first SMA driving wire 130 is in the powered-off state. After the plurality of movable vanes 120 move to the first position and remain in the first position, both the first SMA driving wire 130 and the second SMA driving wire 140 may be in the powered-off state.

[0048] As Figure 5 shown, with such a setting, the first SMA driving wire 130 and the second SMA driving wire 140 can be intermittently powered on. Compared with the technical solution where the SMA driving wire is continuously powered on, intermittent power-on is beneficial to achieving low-energy consumption operation of the aperture assembly 100 and extending the usage time of the projection device 10 in one charging cycle.

[0049] Optionally, as Figure 3 and Figure 4 shown, the first SMA driving wire 130 is arranged to extend along the circumferential direction of the light-transmitting hole 111. In this way, it is convenient for the first SMA driving wire 130 to be respectively connected to each of the 130 plurality of movable vanes 120.

[0050] Optionally, as Figure 4 shown, the second SMA driving wire 140 is located on the side of the first SMA driving wire 130 away from the light-transmitting hole 111.

[0051] With such a setting, the second SMA driving wire 140 can surround the first SMA driving wire 130, which can reduce the required installation space for the second SMA driving wire 140 and the first SMA driving wire 130 and is beneficial to the compact structure of the aperture assembly 100.

[0052] Optionally, as Figures 1 to 4As shown, a plurality of movable vanes 120 are respectively rotatably connected to a base 110. A first SMA drive wire 130 is configured to contract and deform in a driving state to drive the plurality of movable vanes 120 to rotate from a first position to a second position. A second SMA drive wire 140 is configured to contract and deform in a driving state to drive the plurality of movable vanes 120 to rotate from the second position to the first position.

[0053] The plurality of movable vanes 120 can move from the first position to the second position by respectively rotating relative to the base 110. Specifically, a portion of the first SMA drive wire 130 around the light-transmitting center position is arranged to be movable relative to the base 110. When the first SMA drive wire 130 contracts and deforms, it will converge towards the light-transmitting center position and approach the light-transmitting center position.

[0054] In some embodiments, the first SMA drive wire 130 is arranged to approach the light-transmitting center position during the contraction and deformation process, thereby driving the plurality of movable vanes 120 to approach the light-transmitting center position, so that the plurality of movable vanes 120 can move from the first position to the second position.

[0055] In some embodiments, during the process of the plurality of movable vanes 120 moving closer to the light-transmitting center position, the plurality of movable vanes 120 can also move along the axial direction of the light-transmitting hole 111.

[0056] Optionally, as Figure 6 and Figure 7 shown, the movable vane 120 is provided with a protrusion 126, and the base 110 is provided with a limiting groove 112 that corresponds to and cooperates with the protrusion 126 one by one. The protrusion 126 is inserted into the limiting groove 112 to form a sliding connection, and the limiting groove 112 is used to guide the movement of the movable vane 120 relative to the base 110.

[0057] In this way, each movable vane 120 can move relative to the base 110 along a preset path. Further, each limiting groove 112 is arc-shaped, so as to guide the rotation of each movable vane 120 relative to the base 110 respectively.

[0058] Optionally, as Figure 4 and Figure 6 shown, each movable vane 120 has a connected end 121 and a free end 122. The connected end 121 is rotatably connected to the base 110. The free end 122 is used to cover the light-transmitting hole 111. The free end 122 increases or decreases the covering area of the light-transmitting hole 111 by rotating relative to the base 110. The free end 122 is also used to enclose and form an aperture hole 125 that communicates with the light-transmitting hole 111.

[0059] For example, the connection position of each movable vane 120 and the first SMA drive wire 130 is located between the connected end 121 and the free end 122.

[0060] The first SMA driving wire 130 can drive the free end 122 to rotate towards the direction close to the light-transmitting center position, so that the geometric center of each movable vane 120 approaches the light-transmitting center position. With such a setting, the movable vane 120 can be stably connected to the base 110, and it is also convenient to realize the movement of the movable vane 120 close to the light-transmitting center position.

[0061] Optionally, in some embodiments, the connection position of each movable vane 120 and the first SMA driving wire 130 is located at the connection end 121. In other embodiments, the connection position of each movable vane 120 and the first SMA driving wire 130 is located at the free end 122.

[0062] Optionally, as Figure 4 and Figure 6 shown, the aperture assembly 100 includes a plurality of first connectors 150. Each first connector 150 connects a movable vane 120 and the base 110, and each movable vane 120 is rotatably connected to the base 110 through the corresponding first connector 150. A second connector 160 is provided on each movable vane 120. The minimum distance of the second connector 160 relative to the aperture 125 is less than the minimum distance of the first connector 150 relative to the aperture 125, and the first SMA driving wire 130 is connected to the second connector 160.

[0063] By providing the first connector 150, it is beneficial to realize the stable connection between the movable vane 120 and the base 110. By providing the second connector 160, it is beneficial to realize the stable connection between the movable vane 120 and the first SMA driving wire 130, and improve the driving stability of the first SMA driving wire 130 to the movable vane 120.

[0064] Optionally, as Figure 4 shown, the first SMA driving wire 130 sequentially connects the second connectors 160 of each movable vane 120. In this way, the first SMA driving wire 130 can drive each movable vane 120 to move synchronously, and at the same time, it is convenient for the installation of the first SMA driving wire 130.

[0065] Furthermore, compared with the second connector 160, the first connector 150 is farther away from the light-transmitting center position of the light-transmitting hole 111. The rotation axis of each movable vane 120 can be collinear with the central axis of the first connector 150. The second connector 160 can rotate around the corresponding first connector 150. Optionally, when the above-mentioned limiting groove 112 is arc-shaped, the central axis of the limiting groove 112 can be collinear with the central axis of the first connector 150.

[0066] Optionally, as Figure 4As shown, the movable vane 120 has an outer edge 123 and an inner edge 124 that face away from each other. An aperture 125 communicating with the light-transmitting hole 111 is formed between the inner edges 124 of the plurality of movable vanes 120. The direction from the outer edge 123 to the inner edge 124 is defined as the first direction D1. The first SMA drive wire 130 is configured to drive the plurality of movable vanes 120 to rotate relative to the base 110 in the first direction D1 in a driving state, so that the plurality of movable vanes 120 rotate from the first position to the second position.

[0067] The portion of the light-transmitting hole 111 opposite to the aperture 125 is not covered by the plurality of movable vanes 120. By forming the aperture 125, the light-transmitting hole 111 cannot be completely covered by the plurality of movable vanes 120, so that light passes through the aperture 125 and the light-transmitting hole 111 simultaneously and is projected outside the projection device 10 to be sensed.

[0068] In the driving state, the first SMA drive wire 130 drives the plurality of movable vanes 120 to rotate from the first position to the second position in the first direction D1, which can make the inner edges 124 of the plurality of movable vanes 120 approach the light-transmitting center position of the light-transmitting hole 111, thereby reducing the aperture 125 and increasing the covered area of the light-transmitting hole 111.

[0069] Optionally, as Figure 4 and Figure 8 shown, the first SMA drive wire 130 has a closed-loop structure or an open-loop structure at the plurality of movable vanes 120.

[0070] The loop structure of the first SMA drive wire 130 can be matched with the arrangement of the plurality of movable vanes 120 on the base 110. When the plurality of movable vanes 120 enclose a full circle along the circumference of the light-transmitting hole 111, the first SMA drive wire 130 can have a closed-loop structure at the plurality of movable vanes 120. When the plurality of movable vanes 120 enclose a non-full circle along the circumference of the light-transmitting hole 111, the first SMA drive wire 130 can have an open-loop structure at the plurality of movable vanes 120.

[0071] Optionally, as Figure 4 shown, the plurality of movable vanes 120 are configured to enclose an aperture 125 communicating with the light-transmitting hole 111. The first SMA drive wire 130 has a closed-loop structure or an open-loop structure surrounding the aperture 125, and the first SMA drive wire 130 is configured to contract and deform in a driving state to approach the aperture 125.

[0072] Optionally, as Figure 4 and Figure 9 shown, each movable vane 120 is connected to the base 110 by a second SMA drive wire 140.

[0073] Further, a plurality of movable vanes 120 are respectively rotatably connected to the base 110 about their respective rotation axes. The second SMA drive wire 140 is configured to contract and deform away from the light-transmitting center position in the driving state, so as to drive the plurality of movable vanes 120 to rotate from the second position to the first position.

[0074] In this way, when the second SMA drive wire 140 deforms, the base 110 can support or stop the second SMA drive wire 140. The second SMA drive wire 140 can drive the plurality of movable vanes 120 away from the light-transmitting center position, which is beneficial to improving the movement stability of the plurality of movable vanes 120.

[0075] Optionally, as Figure 4 and Figure 9 shown, the portion of the second SMA drive wire 140 around the light-transmitting center position includes a plurality of fixed segments 141 and a plurality of zigzag segments 142 that are alternately connected one by one. The zigzag segments 142 are connected to one side of the fixed segments 141 close to the light-transmitting center position of the light-transmitting hole 111. The base 110 is arranged to position or limit the fixed segments 141. The zigzag segments 142 are connected to the movable vanes 120 one by one. When the second SMA drive wire 140 undergoes a contraction deformation, the degree of zigzag of the zigzag segments 142 decreases and moves away from the light-transmitting center position, thereby driving the movable vanes 120 to move away from the light-transmitting center position. For example, the zigzag segment 142 has a sharp angle pointing to the light-transmitting center position. When the second SMA drive wire 140 undergoes a contraction deformation, the sharp angle of the zigzag segment 142 becomes larger so that the zigzag segment 142 moves away from the light-transmitting center position.

[0076] In some embodiments, during the movement of the plurality of movable vanes 120 away from the light-transmitting center position, the plurality of movable vanes 120 can also move along the axial direction of the light-transmitting hole 111.

[0077] Optionally, as Figure 4 and Figure 6 shown, the movable vane 120 has a connecting end 121 and a free end 122. The connecting end 121 is rotatably connected to the base 110 about the corresponding rotation axis, and the free end 122 can rotate relative to the base 110 about the rotation axis. The connection position of each movable vane 120 and the second SMA drive wire 140 is located between the connecting end 121 and the free end 122.

[0078] When the second SMA drive wire 140 drives the connecting end 121 to rotate about the corresponding rotation axis, the free end 122 can move away from the light-transmitting center position, so that the geometric center of each movable vane 120 moves away from the light-transmitting center position. With such a setting, the movable vane 120 can be stably connected to the base 110, and the movable vane 120 can be moved away from the light-transmitting center position.

[0079] In some embodiments, there may be two connection positions for each movable vane 120 with the second SMA drive line 140. The former of the two connection positions is rotatably connected to the base 110, and the latter of the two connection positions can rotate around the former of the two connection positions. Further, the former of the two connection positions is located at the connection end 121, and the latter of the two connection positions is located at the free end 122.

[0080] In other embodiments, there is one connection position for each movable vane 120 with the second SMA drive line 140, and there are multiple connection positions for the second SMA drive line 140 with the base 110. The connection position of each movable vane 120 with the second SMA drive line 140 can rotate around one of the connection positions of the second SMA drive line 140 with the base 110. Further, the connection position of the movable vane 120 with the second SMA drive line 140 can be located at the free end 122.

[0081] Optionally, as Figure 4 and Figure 6 shown, the second SMA drive line 140 successively connects the first connector 150 of one movable vane 120 and the second connector 160 of another movable vane 120 among every two adjacent movable vanes 120.

[0082] By providing the first connector 150 and the second connector 160, it is beneficial to achieve a stable connection among the base 110, the movable vane 120, and the second SMA drive line 140. With such an arrangement, it is convenient for the assembly of the second SMA drive line 140 and beneficial for the second SMA drive line 140 to drive the movable vane 120 smoothly.

[0083] Optionally, the above-mentioned protrusion 126 is formed on the second connector 160.

[0084] Optionally, as Figure 4 and Figure 9 shown, each first connector 150 is connected to one of the above-mentioned fixed segments 141. Each second connector 160 is connected to one of the above-mentioned zigzag segments 142.

[0085] Optionally, as Figure 3 and Figure 4 shown, the second SMA drive line 140 is used to drive a plurality of movable vanes 120 to rotate relative to the base 110 in a second direction D2 opposite to the first direction D1 in the driving state, so that the plurality of movable vanes 120 rotate from the second position to the first position.

[0086] The second SMA driving wire 140 drives the plurality of movable vanes 120 to rotate from the second position to the first position along the second direction D2 in the driving state, so that the inner edges 124 of the plurality of movable vanes 120 are far away from the light-transmitting center position of the light-transmitting hole 111, thereby expanding the aperture hole 125 and reducing the area of the light-transmitting hole 111 covered.

[0087] Optionally, as Figure 8 shown, the second SMA driving wire 140 has a closed-loop structure or an open-loop structure at the plurality of movable vanes 120.

[0088] Furthermore, as Figure 4 shown, the second SMA driving wire 140 has a closed-loop structure or an open-loop structure surrounding the aperture hole 125.

[0089] The loop structure of the second SMA driving wire 140 can be matched with the arrangement of the plurality of movable vanes 120 on the base 110. When the plurality of movable vanes 120 surround a full circle along the circumference of the light-transmitting hole 111, the second SMA driving wire 140 can have a closed-loop structure at the plurality of movable vanes 120. When the plurality of movable vanes 120 do not surround a full circle along the circumference of the light-transmitting hole 111, the second SMA driving wire 140 can have an open-loop structure at the plurality of movable vanes 120.

[0090] Optionally, as Figure 8 shown, the first SMA driving wire 130 includes a first driving section 131 and a second driving section 132. The two ends of the first driving section 131 are respectively connected to the two ends of the second driving section 132 to form a parallel circuit, or the two ends of the first SMA driving wire 130 are respectively used to connect the positive electrode and the negative electrode to form a series circuit.

[0091] That is to say, the first SMA driving wire 130 has a closed-loop structure at the plurality of movable vanes 120, and different positions of the closed-loop structure are respectively connected to the positive electrode and the negative electrode to form a parallel circuit. Or, the first SMA driving wire 130 has an open-loop structure at the plurality of movable vanes 120, and the two ends of the open-loop structure are respectively connected to the positive electrode and the negative electrode to form a series circuit. Such an arrangement facilitates the circuit layout of the aperture assembly 100.

[0092] Optionally, as Figure 8 shown, the second SMA driving wire 140 includes a third driving section 143 and a fourth driving section 144. The two ends of the third driving section 143 are respectively connected to the two ends of the fourth driving section 144 to form a parallel circuit, or the two ends of the second SMA driving wire 140 are respectively used to connect the positive electrode and the negative electrode to form a series circuit.

[0093] That is to say, the second SMA drive line 140 has a closed-loop structure at multiple movable vanes 120, and different positions of the closed-loop structure are respectively connected to the positive electrode and the negative electrode to form a parallel circuit. Or, the second SMA drive line 140 has an open-loop structure at multiple movable vanes 120, and both ends of the open-loop structure are respectively connected to the positive electrode and the negative electrode to form a series circuit. With such a setting, it is convenient to arrange the circuit of the aperture assembly 100.

[0094] Optionally, the aperture assembly 100 includes an insulating wire. The first SMA drive line 130 has an open-loop structure at multiple movable vanes 120, and both ends of the first SMA drive line 130 can be connected to both ends of the insulating wire to form a closed-loop structure.

[0095] Optionally, the aperture assembly 100 includes an insulating wire. The second SMA drive line 140 has an open-loop structure at multiple movable vanes 120, and both ends of the second SMA drive line 140 can be connected to both ends of the insulating wire to form a closed-loop structure.

[0096] Optionally, as Figure 4 shown, the first SMA drive line 130 is used to undergo a contraction deformation in the driving state to drive multiple movable vanes 120 to move from the first position to the second position, thereby driving the second SMA drive line 140 to undergo a tensile deformation. The second SMA drive line 140 is used to undergo a contraction deformation in the driving state to drive multiple movable vanes 120 to move from the second position to the first position, thereby driving the first SMA drive line 130 to undergo a tensile deformation.

[0097] Furthermore, the first SMA drive line 130 is used to undergo a contraction deformation in the driving state to drive multiple movable vanes 120 to move from the first position to the second position, thereby driving the second SMA drive line 140 to undergo a tensile deformation. The second SMA drive line 140 is used to undergo a contraction deformation in the driving state to drive multiple movable vanes 120 to move from the second position to the first position, thereby driving the first SMA drive line 130 to undergo a tensile deformation.

[0098] With such a setting, the first SMA drive line 130 and the second SMA drive line 140 can cooperate with each other to improve the automation degree of the aperture assembly 100 for adjusting the light quantity.

[0099] Furthermore, the tensile deformation amount generated by the second SMA drive line 140 driven by the first SMA drive line 130 is the same as the contraction deformation amount generated by the second SMA drive line 140 in the driving state. The tensile deformation amount generated by the first SMA drive line 130 driven by the second SMA drive line 140 is the same as the contraction deformation amount generated by the first SMA drive line 130 in the driving state.

[0100] Optionally, asFigure 10 As shown, a plurality of movable vanes 120 are respectively slidably connected to the base 110. The first SMA driving wire 130 is used to contract and deform in the driving state to drive the plurality of movable vanes 120 to slide from the first position to the second position. The second SMA driving wire 140 is used to contract and deform in the driving state to drive the plurality of movable vanes 120 to slide from the second position to the first position.

[0101] Furthermore, a plurality of movable vanes 120 are respectively slidably connected to the base 110. The first SMA driving wire 130 is used to contract and deform near the light-transmitting center position in the driving state to drive the plurality of movable vanes 120 to slide from the first position to the second position. The second SMA driving wire 140 is used to contract and deform away from the light-transmitting center position in the driving state to drive the plurality of movable vanes 120 to slide from the second position to the first position.

[0102] The plurality of movable vanes 120 can switch their movements between the second position and the first position by sliding relative to the base 110 respectively. The first SMA driving wire 130 is arranged to approach the light-transmitting center position during the contraction and deformation process, thereby driving the plurality of movable vanes 120 to approach the light-transmitting center position, so that the plurality of movable vanes 120 can slide from the first position to the second position. The second SMA driving wire 140 is arranged to move away from the light-transmitting center position during the contraction and deformation process, thereby driving the plurality of movable vanes 120 to move away from the light-transmitting center position, so that the plurality of movable vanes 120 can slide from the second position to the first position.

[0103] As Figure 10 shown, optionally, the aperture assembly 100 includes a plurality of first connectors 150 corresponding to the plurality of movable vanes 120 one by one, and each first connector 150 is fixedly arranged on the base 110. A second connector 160 is arranged on each movable vane 120. The first SMA driving wire 130 is sequentially connected to the second connectors 160 of each movable vane 120. The second SMA driving wire 140 is sequentially connected to the first connectors 150 and the second connectors 160 of each movable vane 120.

[0104] As Figure 10As shown, optionally, the movable vane 120 has an outer edge 123 and an inner edge 124 facing away from each other. An aperture hole 125 for enclosing the light-transmitting hole 111 is formed between the inner edges 124 of the plurality of movable vanes 120. It is defined that the direction from the outer edge 123 to the inner edge 124 is the third direction D3. The first SMA driving wire 130 is configured to drive the plurality of movable vanes 120 to slide relative to the base 110 in the third direction D3 in a driving state, so that the plurality of movable vanes 120 slide from the first position to the second position. The second SMA driving wire 140 is configured to drive the plurality of movable vanes 120 to slide relative to the base 110 in a fourth direction D4 opposite to the third direction D3 in a driving state, so that the plurality of movable vanes 120 slide from the second position to the first position.

[0105] Optionally, as Figure 10 and Figure 11 shown, a protrusion 126 may be provided on each movable vane 120, and a limiting groove 112 corresponding to the protrusion 126 one by one may be provided on the base 110. The protrusion 126 is slidably inserted into the limiting groove 112, so that the movable vane 120 can slide relative to the base 110 along a preset path. Further, each limiting groove 112 is linear, and the extending direction of each limiting groove 112 is parallel to the third direction D3 and the fourth direction D4, so as to guide the sliding of the movable vane 120 relative to the base 110. Further, the protrusion 126 is formed on the second connecting member 160.

[0106] As Figure 12 shown, the projection device 10 described in the embodiment of the present application includes an aperture assembly 100, a lens 200, and a projection light source 300. The lens 200 is disposed opposite to the light-transmitting hole 111 of the aperture assembly 100. The light emitted by the projection light source 300 enters the lens 200 through the light-transmitting hole 111 and forms an image in the outside world.

[0107] The projection device 10 refers to an electronic device having a projection function, such as a projector. The light emitted by the projection light source 300 located inside the projection device 10 can pass through the lens 200 and the aperture assembly 100 to reach the outside world for imaging. Along the path of the light, the aperture assembly 100 may be located behind the lens 200, or between the lens 200 and the projection light source 300, or inside the lens 200. By the aperture assembly 100 described in the embodiment of the aperture assembly 100, the projection effect and the degree of automation of the projection device 10 can be improved, and it helps to simplify the structure of the projection device 10.

[0108] In summary, the present embodiment can adjust the brightness of the obtained image by adjusting the amount of light through the aperture assembly 100, thereby improving the projection effect. It can also improve the evenness of the forces on the multiple movable vanes 120, which is beneficial to improving the linkage and synchronism of the multiple movable vanes 120 moving from the first position to the second position, and can simplify the structure of the aperture assembly 100, which is beneficial to improving the automation degree of the aperture assembly 100.

[0109] The above are only the embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall be similarly included in the patent protection scope of the present application.

Claims

1. An aperture assembly, characterized in that, Comprising: A base having a light-transmitting hole; A plurality of movable vanes arranged circumferentially along the light-transmitting hole and respectively movably connected to the base so as to be capable of moving between a first position and a second position relative to the base; the covering area of the light-transmitting hole by the plurality of movable vanes in the first position is smaller than that in the second position; A first SMA drive wire connecting the plurality of movable vanes and configured to deform in a driving state to drive the plurality of movable vanes to move from the first position to the second position; A second SMA drive wire connecting the plurality of movable vanes and configured to deform in a driving state to drive the plurality of movable vanes to move from the second position to the first position.

2. The aperture assembly according to claim 1, wherein The first SMA drive wire is arranged to extend circumferentially along the light-transmitting hole; and / or the second SMA drive wire is located on a side of the first SMA drive wire away from the light-transmitting hole.

3. The aperture assembly according to claim 1 or 2, wherein The plurality of movable vanes are respectively rotatably connected to the base, and the first SMA drive wire is configured to contract and deform in a driving state to drive the plurality of movable vanes to rotate from the first position to the second position; The second SMA drive wire is configured to contract and deform in a driving state to drive the plurality of movable vanes to rotate from the second position to the first position.

4. The aperture assembly according to claim 3, wherein Each of the movable vanes has a connected end and a free end, the connected end is rotatably connected to the base, the free end is configured to cover the light-transmitting hole, and the free end increases or decreases the covering area of the light-transmitting hole by rotating relative to the base; the free end is further configured to surround and form an aperture hole communicating with the light-transmitting hole.

5. The aperture assembly according to claim 4, wherein The aperture assembly includes a plurality of first connectors, each first connector connecting one of the movable vanes and the base, and each movable vane is rotatably connected to the base through the corresponding first connector; a second connector is provided on each movable vane, and the minimum distance of the second connector relative to the aperture hole is smaller than the minimum distance of the first connector relative to the aperture hole, and the first SMA drive wire is connected to the second connector.

6. The aperture assembly according to claim 5, wherein The first SMA drive wire sequentially connects the second connectors of each of the movable vanes.

7. The aperture assembly according to claim 5, wherein Each of the movable vanes is connected to the base through the second SMA drive wire.

8. The aperture assembly according to claim 7, wherein The second SMA drive wire sequentially connects the first connector of one of the movable vanes and the second connector of another movable vane among every two adjacent movable vanes.

9. The aperture assembly according to claim 1 or 2, wherein The movable vane is provided with a convex portion, and the base is provided with a limiting groove corresponding to the convex portion in a one-to-one manner. The convex portion is inserted into the limiting groove to form a sliding connection, and the limiting groove is used to guide the movement of the movable vane relative to the base.

10. The aperture assembly according to claim 1 or 2, wherein the plurality of movable vanes are used to enclose and form an aperture hole communicating with the light transmission hole; the first SMA driving wire has a closed-loop structure or an open-loop structure surrounding the aperture hole, and the first SMA driving wire is used to contract and deform in a driving state to approach the aperture hole; and / or, the second SMA driving wire has a closed-loop structure or an open-loop structure surrounding the aperture hole.

11. The aperture assembly according to claim 1 or 2, wherein the first SMA driving wire includes a first driving section and a second driving section, and the two ends of the first driving section are respectively connected to the two ends of the second driving section to form a parallel circuit, or the two ends of the first SMA driving wire are respectively used to connect to a positive electrode and a negative electrode to form a series circuit; and / or, the second SMA driving wire includes a third driving section and a fourth driving section, and the two ends of the third driving section are respectively connected to the two ends of the fourth driving section to form a parallel circuit, or the two ends of the second SMA driving wire are respectively used to connect to a positive electrode and a negative electrode to form a series circuit.

12. The aperture assembly according to claim 1 or 2, wherein the first SMA driving wire is used to contract and deform in a driving state to drive the plurality of movable vanes to move from the first position to the second position, thereby driving the second SMA driving wire to undergo tensile deformation; the second SMA driving wire is used to contract and deform in a driving state to drive the plurality of movable vanes to move from the second position to the first position, thereby driving the first SMA driving wire to undergo tensile deformation.

13. The aperture assembly according to claim 1 or 2, wherein the plurality of movable vanes are respectively slidably connected to the base; the first SMA driving wire is used to contract and deform in a driving state to drive the plurality of movable vanes to slide from the first position to the second position; the second SMA driving wire is used to contract and deform in a driving state to drive the plurality of movable vanes to slide from the second position to the first position.

14. A projection device, characterized in that, Comprising: the aperture assembly according to any one of claims 1-13; a lens, disposed opposite to the light transmission hole of the aperture assembly; a projection light source, and the light emitted by the projection light source enters the lens through the light transmission hole and forms an image in the outside world.

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