Piezoelectric driving module and projection equipment

Abstract

The invention discloses a piezoelectric driving module and projection equipment, and relates to the technical field of driving modules.The piezoelectric driving module comprises a fixed base, a main piezoelectric driving module, a lower-layer movement frame, an auxiliary piezoelectric driving module and an upper-layer movement frame; one end of the main piezoelectric driving module is connected with the fixed base; the lower-layer moving frame is connected with the other end of the main piezoelectric driving module; one end of the auxiliary piezoelectric driving module is fixed on the lower-layer moving frame; the upper-layer movement frame is connected with the other end of the auxiliary piezoelectric driving module, and the upper-layer movement frame is used for installing an execution end; the main piezoelectric driving module is used for driving the lower-layer moving frame to move in one direction, and the auxiliary piezoelectric driving module is used for driving the upper-layer moving frame to move in the other direction. According to the technical scheme, the driving requirement for driving the execution end to complete composite motion can be met, and therefore the driving precision is improved.

Description

Technical Field

[0001] This invention relates to the field of drive module technology, and in particular to a piezoelectric drive module and a projection device. Background Technology

[0002] In recent years, with the increasing market demand for ultra-thin vibration motors, especially in the field of new energy vehicles, the lightweighting and high performance of vibration motors have become the focus of industry attention.

[0003] Currently, most mainstream vibration motors on the market adopt a dual electromagnetic drive method. Due to their inherent structural characteristics and driving principle, traditional dual electromagnetic vibration motors are prone to mutual interference between the two drivers during operation, making it difficult for the vibration motor to drive the actuator to complete complex motion trajectories. Summary of the Invention

[0004] The main objective of this invention is to propose a piezoelectric drive module and projection device, which aims to meet the drive requirements of driving the actuator to complete compound motion, thereby improving drive accuracy.

[0005] To achieve the above objectives, the present invention proposes a piezoelectric drive module, the piezoelectric drive module comprising: Fixed base; A main piezoelectric drive module, one end of which is connected to the fixed base; The lower motion frame is connected to the other end of the main piezoelectric drive module; A secondary piezoelectric drive module, one end of which is fixed to the lower moving frame; and An upper motion frame is connected to the other end of the auxiliary piezoelectric drive module, and the upper motion frame is used to install the actuator. The main piezoelectric drive module is used to drive the lower motion frame to move in one direction, and the auxiliary piezoelectric drive module is used to drive the upper motion frame to move in another direction.

[0006] In one embodiment, one end of the main piezoelectric drive module is connected to one side of the lower moving frame, one end of the auxiliary piezoelectric drive module is fixed to the other side of the lower moving frame, and the main piezoelectric drive module and the auxiliary piezoelectric drive module are located on adjacent sides of the lower moving frame.

[0007] In one embodiment, the piezoelectric drive module further includes a first support component and a second support component. The two ends of the first support component are respectively connected to the fixed base and the lower motion frame, and the two ends of the second support component are respectively connected to the lower motion frame and the upper motion frame. The first support component is symmetrically arranged with the main piezoelectric drive module, and the second support component is symmetrically arranged with the auxiliary piezoelectric drive module.

[0008] In one embodiment, the main piezoelectric drive module includes: A first deformable part, one end of which is connected to the fixed base; A first mounting plate, one end of which is connected to the other end of the first deformable part; A first piezoelectric ceramic, disposed on the first mounting plate, is used for connection to an external power source; and The first connecting part has two ends connected to the other end of the first mounting plate and the lower moving frame, respectively. The first piezoelectric ceramic is used to drive the first mounting plate and the lower motion frame to vibrate synchronously.

[0009] In one embodiment, the secondary piezoelectric drive module includes: The second deformation part, one end of which is connected to the lower moving frame; A second mounting plate, one end of which is connected to the other end of the second deformable part; A second piezoelectric ceramic, disposed on the second mounting plate, is used for connection to an external power source; and The second connecting part has two ends connected to the other end of the second mounting plate and the upper motion frame, respectively. The second piezoelectric ceramic is used to drive the second mounting plate and the upper motion frame to vibrate synchronously.

[0010] In one embodiment, the transverse cross-sectional shape of both the first deformed portion and the second deformed portion is U-shaped, S-shaped, or Z-shaped.

[0011] In one embodiment, the width of the first mounting plate is greater than the width of the second mounting plate; And / or, the width of the first piezoelectric ceramic is greater than the width of the second piezoelectric ceramic.

[0012] In one embodiment, the thickness ratio of the first mounting plate to the thickness of the first piezoelectric ceramic is less than 2 / 1; The thickness ratio of the second mounting plate to the second piezoelectric ceramic is less than 2 / 1.

[0013] In one embodiment, both the first support component and the second support component are elastic support arms.

[0014] The present invention also proposes a projection device, which includes a housing, a light source, an imaging module, a dissipation plate, and a piezoelectric drive module as described above. The light source, the imaging module, the dissipation plate, and the piezoelectric drive module are all installed inside the housing, and the piezoelectric drive module is drively connected to the dissipation plate.

[0015] The piezoelectric drive module of this invention includes a fixed base, a main piezoelectric drive module, a lower motion frame, a secondary piezoelectric drive module, and an upper motion frame. One end of the main piezoelectric drive module is connected to the fixed base. The lower motion frame is connected to the other end of the main piezoelectric drive module. One end of the secondary piezoelectric drive module is fixed to the lower motion frame. The upper motion frame is connected to the other end of the secondary piezoelectric drive module and is used to mount the actuator. The main piezoelectric drive module drives the lower motion frame to achieve movement in one direction, while the secondary piezoelectric drive module drives the upper motion frame to achieve movement in another direction. The upper motion frame is mounted on the lower motion frame. The movement of the lower motion frame will affect the position of the upper motion frame. However, the auxiliary piezoelectric drive module can independently control the displacement of the upper motion frame. Thus, through the synergistic effect of the two modules, the actuator can complete multi-degree-of-freedom composite motion. At the same time, the piezoelectric drive has the characteristics of high resolution and high response speed, which can achieve precise displacement control at the micron or even nanometer level. Therefore, this layered drive structure not only meets the driving requirements of composite motion, but also significantly improves the overall drive accuracy by reducing transmission errors and improving positioning accuracy. It is particularly suitable for the precise adjustment of optical components in projection equipment, thereby improving projection quality. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the piezoelectric drive module provided by the present invention; Figure 2 This is a schematic diagram of the structure of the main piezoelectric drive module of the piezoelectric drive module provided by the present invention; Figure 3 A schematic diagram of the lower motion frame of the piezoelectric drive module provided by the present invention; Figure 4This is a schematic diagram of the upper motion frame of the piezoelectric drive module provided by the present invention.

[0018] Explanation of icon numbers: 10. Fixed base; 20. Main piezoelectric drive module; 21. First deformation part; 22. First mounting plate; 23. First piezoelectric ceramic; 24. First connecting part; 30. Lower motion frame; 40. Secondary piezoelectric drive module; 41. Second deformation part; 42. Second mounting plate; 43. Second piezoelectric ceramic; 44. Second connecting part; 50. Upper motion frame; 60. First support assembly; 70. Second support assembly; 1. Actuating end.

[0019] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0021] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0022] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0023] In existing technologies, with the increasing demand for ultra-thin vibration motors in the new energy vehicle sector, the traditional dual-electromagnetic drive method has revealed inherent defects. Dual-electromagnetic actuators are prone to electromagnetic coupling interference during operation, making it difficult for the actuator to achieve composite motion trajectories. In a projection equipment debugging scenario, the dissipation plate needs to move along an elliptical trajectory in the XY-axis plane, but traditional electromagnetic drive modules suffer from significant deviations in motion paths due to mutual interference between the actuators, failing to meet the requirements for high-precision optical adjustment.

[0024] To resolve the above issues, please refer to Figures 1 to 4 This application proposes a piezoelectric drive module including a fixed base 10, a main piezoelectric drive module 20, a lower motion frame 30, a secondary piezoelectric drive module 40, and an upper motion frame 50. The main piezoelectric drive module 20 connects the fixed base 10 and the lower motion frame 30, and the secondary piezoelectric drive module 40 is fixed to the lower motion frame 30 and connected to the upper motion frame 50. The main and secondary modules drive movement in different directions, respectively.

[0025] In this embodiment, the fixed base 10 refers to the rigid base supporting the overall structure. It can be made of aluminum alloy and fixed to the equipment frame with bolts, providing stable support for the drive system. The main piezoelectric drive module 20 refers to the piezoelectric actuation unit that generates the first axial driving force and is rigidly connected to the fixed base 10 with bolts. The lower motion frame 30 refers to the intermediate carrier that transmits the kinetic energy of the main piezoelectric drive module 20. It adopts a hollow titanium alloy frame structure to reduce weight while maintaining structural rigidity. The auxiliary piezoelectric drive module 40 refers to the independent actuation unit that generates the second axial driving force. Its mounting base is arranged spatially orthogonally to the main piezoelectric drive module 20 and fixed to a specific mounting position on the lower motion frame 30. The upper motion frame 50 refers to the terminal platform that carries the actuator 1. It has a standard interface for connection with the dissipation plate and is made of magnesium alloy to achieve lightweight design.

[0026] Specifically, when the main piezoelectric drive module 20 receives a high-frequency alternating voltage, the piezoelectric ceramic undergoes periodic expansion and contraction deformation, which is converted into linear reciprocating motion of the lower motion frame 30 through a mechanical amplification mechanism. At the same time, the auxiliary piezoelectric drive module 40 moves as a whole with the lower motion frame 30, and its own piezoelectric ceramic undergoes orthogonal deformation under the action of an independent control signal, driving the upper motion frame 50 to form a superimposed motion trajectory. The physical isolation design of the two drive modules effectively blocks mechanical vibration coupling, and the control signal is transmitted through an independent circuit channel to avoid electrical interference. For example, in the example of driving the dissipation plate in a projection device, the main piezoelectric drive module 20 is set to a frequency of 200Hz to achieve high-frequency micro-amplitude vibration on the X-axis, and the auxiliary piezoelectric drive module 40 drives the Y-axis motion at 150Hz. The combined motion of the two axes forms an 8-shaped composite trajectory.

[0027] The piezoelectric drive module of the present invention drives the lower motion frame 30 to achieve movement in one direction through the main piezoelectric drive module 20, while the auxiliary piezoelectric drive module 40 drives the upper motion frame 50 to achieve movement in another direction. Since the upper motion frame 50 is mounted on the lower motion frame 30, the movement of the lower motion frame 30 will affect the position of the upper motion frame 50. However, the auxiliary piezoelectric drive module 40 can independently control the displacement of the upper motion frame 50. Thus, through the synergistic effect of the two modules, the actuator 1 can complete a multi-degree-of-freedom composite motion. At the same time, piezoelectric drive has the characteristics of high resolution and high response speed, which can achieve precise displacement control at the micron or even nanometer level. Therefore, this layered drive structure not only meets the driving requirements of composite motion, but also significantly improves the overall drive accuracy by reducing transmission errors and improving positioning accuracy. It is particularly suitable for the precise adjustment of optical components in projection equipment, thereby improving projection quality.

[0028] Please see Figures 1 to 4 This application further proposes that one end of the main piezoelectric drive module 20 is connected to one side of the lower motion frame 30, and one end of the auxiliary piezoelectric drive module 40 is fixed to the other side of the lower motion frame 30. The main piezoelectric drive module 20 and the auxiliary piezoelectric drive module 40 are located on adjacent sides of the lower motion frame 30.

[0029] In this embodiment, the connection of the main piezoelectric drive module 20 to one side of the lower motion frame 30 means that the output end of the module is fixed to one side of the lower motion frame 30 via a mechanical interface. The fixation of the auxiliary piezoelectric drive module 40 to the other side of the lower motion frame 30 means that the input end of the module is installed on the side adjacent to the side where the main piezoelectric drive module 20 is located via welding or bolt connection. The adjacent two-sided layout means that the main piezoelectric drive module 20 and the auxiliary piezoelectric drive module 40 respectively occupy two mutually perpendicular edge regions of the lower motion frame 30 in a planar coordinate system, such as the X-axis side and the Y-axis side.

[0030] Specifically, the driving force generated by the main piezoelectric drive module 20 is transmitted along one side of the lower motion frame 30, driving linear displacement on that side. The driving force of the auxiliary piezoelectric drive module 40 is transmitted to the upper motion frame 50 through the adjacent side of the lower motion frame 30, forming a motion component spatially orthogonal to the direction of the main driving force. Because the installation positions of the two drive modules are spatially intersecting, the vibration waves do not superimpose along the same path during transmission, thus avoiding mutual interference. The rigid structure of the lower motion frame 30 decouples the linear motion of the main piezoelectric drive module 20 from the torsional motion of the auxiliary piezoelectric drive module 40, allowing the driving forces in both directions to be transmitted independently through different sides. Compared to the traditional same-side stacking arrangement, the adjacent-side installation method reduces the stacking thickness of the drive modules in a single axis, providing space for a more compact overall structure.

[0031] Compared to existing technologies, when traditional dual-drive modules are stacked on the same side, the vibration waves from the two drivers will cause phase interference along the same path, resulting in a deviation in the motion trajectory. This solution, however, uses an adjacent-side layout to ensure that the vibration transmission paths of the two drive modules are orthogonal in space, fundamentally eliminating motion interference.

[0032] Through the above technical solution, this application effectively avoids the spatial interference problem caused by the main and auxiliary piezoelectric drive modules 40 during movement, ensuring that the driving forces in the two directions can be transmitted independently without interference. Drive efficiency is improved through spatial decoupling, and motion trajectory deviation is controlled within allowable limits. The installation method on adjacent sides significantly reduces the overall size of the module while maintaining drive performance, meeting the stringent space utilization requirements of ultra-thin devices.

[0033] Please see Figures 1 to 4 This application further proposes that the piezoelectric drive module also includes a first support component 60 and a second support component 70. The two ends of the first support component 60 are respectively connected to the fixed base 10 and the lower motion frame 30, and the two ends of the second support component 70 are respectively connected to the lower motion frame 30 and the upper motion frame 50. The first support component 60 and the main piezoelectric drive module 20 are arranged symmetrically, and the second support component 70 and the auxiliary piezoelectric drive module 40 are arranged symmetrically.

[0034] In this embodiment, the first support component 60 refers to the connecting mechanism disposed between the fixed base 10 and the lower moving frame 30, and its function is to balance the lateral vibration component generated when the main piezoelectric drive module 20 is working. The second support component 70 refers to the constraint mechanism disposed between the lower moving frame 30 and the upper moving frame 50, and its function is to suppress the non-axial displacement generated when the auxiliary piezoelectric drive module 40 moves. The symmetrical arrangement means that the support components and the corresponding drive modules form a mirror symmetry relationship in spatial layout, which can be achieved by equidistant distribution or geometric symmetry, and its function is to construct a mechanical balance system to counteract vibration interference.

[0035] Specifically, when the main piezoelectric drive module 20 drives the lower motion frame 30 to move along the first direction, the first support component 60 generates a reverse constraint force at a symmetrical position, converting the lateral vibration generated by the drive module into elastic deformation energy for absorption. Simultaneously, as the auxiliary piezoelectric drive module 40 drives the upper motion frame 50 to move along the second direction, the second support component 70 limits the deflection angle of the motion plane through symmetrically distributed constraint forces, allowing vibration energy to be transmitted along a predetermined direction. The two sets of support components form a spatially symmetrical mechanical system with the main and auxiliary piezoelectric drive modules 40, maintaining axial motion freedom while absorbing vibration energy in non-working directions through the symmetrical deformation of the elastic support structure, thereby eliminating trajectory deviation in the combined motion.

[0036] This solution constructs a bidirectional vibration constraint mechanism through symmetrically distributed support components. While maintaining the motion efficiency of the drive module, it controls the vibration amplitude in the non-working direction within the deformation range of the elastic support structure, effectively solving the energy loss problem in compound motion.

[0037] Please see Figures 1 to 4 This application further proposes that the main piezoelectric drive module 20 includes a first deformation part 21, a first mounting plate 22, a first piezoelectric ceramic 23, and a first connecting part 24. One end of the first deformation part 21 is connected to the fixed base 10, and the other end is connected to the first mounting plate 22. The first piezoelectric ceramic 23 is disposed on the first mounting plate 22 and connected to an external power supply. The two ends of the first connecting part 24 are respectively connected to the other end of the first mounting plate 22 and the lower moving frame 30.

[0038] In this embodiment, the first deformation part 21 refers to a mechanical connecting component with elastic deformation capability, specifically made of a thin metal sheet or an elastic alloy material, which absorbs vibration energy and transmits displacement through bending deformation. The first mounting plate 22 refers to a rigid substrate supporting the piezoelectric ceramic, specifically made of alumina ceramic or titanium alloy material, whose thickness matches the vibration mode of the first piezoelectric ceramic 23. The first piezoelectric ceramic 23 refers to a functional material with inverse piezoelectric effect, specifically made of lead zirconate titanate ceramic, which generates expansion and contraction deformation under the action of an electric field to drive the vibration of the mounting plate. The first connecting part 24 refers to a rigid connecting rod that transmits vibration displacement, specifically made of stainless steel column or carbon fiber rod, which transmits the vibration displacement of the mounting plate to the lower motion frame 30 without attenuation.

[0039] Specifically, when an alternating voltage is applied to the first piezoelectric ceramic 23 by an external power source, the first piezoelectric ceramic 23 undergoes periodic expansion and contraction deformation. This deformation is converted into planar vibration by the first mounting plate 22 and transmitted to the lower motion frame 30 through the first connecting part 24. The first deformation part 21 undergoes elastic bending during vibration, maintaining the connection stability between the main piezoelectric drive module 20 and the fixed base 10, while also absorbing vibration energy through deformation to avoid stress concentration. The rigid design of the first mounting plate 22 ensures efficient transmission of vibration energy, and its thickness matching relationship with the first piezoelectric ceramic 23 optimizes the symmetry of the vibration modes. The rigid connection of the first connecting part 24 eliminates phase delay during vibration transmission, enabling the lower motion frame 30 to vibrate synchronously with the first mounting plate 22.

[0040] Through the above technical solution, this application solves the problem of limited motion of the actuator 1 caused by electromagnetic interference in traditional drive modules. The matching design of the first piezoelectric ceramic 23 and the first mounting plate 22 optimizes the conversion efficiency of vibration energy, the elastic characteristics of the first deformation part 21 realize the directional transmission and stress release of vibration energy, and the rigid structure of the first connecting part 24 ensures the precise transmission of vibration displacement. The synergistic effect of each component forms a closed-loop vibration system, enabling the lower motion frame 30 to generate controlled directional displacement, providing a precise driving foundation for the composite motion of the actuator 1.

[0041] Please see Figures 1 to 4 This application further proposes an implementation scheme for a piezoelectric drive module, which includes a second deformation part 41, a second mounting plate 42, a second piezoelectric ceramic 43, and a second connecting part 44. One end of the second deformation part 41 is connected to the lower motion frame 30, and the other end is connected to the second mounting plate 42. The second piezoelectric ceramic 43 is disposed on the second mounting plate 42 and connected to an external power supply. The second connecting part 44 connects the second mounting plate 42 to the upper motion frame 50, realizing that the second piezoelectric ceramic 43 drives the upper motion frame 50 to vibrate synchronously.

[0042] In this embodiment, the second deformation part 41 refers to a structural component with elastic deformation capability, whose function is to absorb vibration interference from the lower moving frame 30 through elastic deformation. The second mounting plate 42 refers to a rigid substrate that supports the second piezoelectric ceramic 43, specifically an alumina ceramic plate, whose function is to provide a stable mounting platform for the second piezoelectric ceramic 43. The second piezoelectric ceramic 43 refers to a functional material with inverse piezoelectric effect, specifically a lead zirconate titanate ceramic sheet, whose function is to convert electrical energy into mechanical vibration energy. The second connecting part 44 refers to a rigid connecting member that transmits vibration, specifically a stainless steel connecting rod, whose function is to transmit the vibration displacement of the second mounting plate 42 to the upper moving frame 50 without loss.

[0043] Specifically, when an alternating voltage is applied to the second piezoelectric ceramic 43 by an external power source, the piezoelectric effect causes the second mounting plate 42 to undergo periodic bending deformation. During this process, the second deformation section 41 undergoes elastic deformation, allowing relative displacement between the lower moving frame 30 and the upper moving frame 50 while limiting the vibration amplitude through its own stiffness. The second connecting section 44 directly transmits the vibration of the second mounting plate 42 to the upper moving frame 50, forming a motion path independent of the main piezoelectric drive module 20. Through the elastic buffering effect of the second deformation section 41, resonance interference between the main and auxiliary piezoelectric drive modules 40 can be eliminated, while the rigid connection of the second connecting section 44 ensures efficient vibration transmission.

[0044] This solution utilizes the directional driving characteristics of the second piezoelectric ceramic 43, combined with a layered mechanical structure design, to achieve physical isolation between the main piezoelectric drive module 20 and the auxiliary piezoelectric drive module 40. The elastic deformation mechanism of the second deformation section 41 replaces the buffer spring in traditional electromagnetic drives, simplifying the structural hierarchy and avoiding fatigue failure of elastic elements. The rigid transmission method of the second connection section 44 significantly improves the linearity of displacement transmission compared to traditional flexible connections.

[0045] The second deformation section 41 of this application absorbs vibration interference through controllable elastic deformation, the second connecting section 44 ensures the stability of the vibration transmission path through rigid connection, and the second piezoelectric ceramic 43 achieves precise displacement control through directional driving characteristics. The synergistic effect of each component ensures that the motion trajectory of the upper motion frame 50 is not affected by the vibration state of the lower motion frame 30, thereby guaranteeing the accuracy of composite motion control.

[0046] Please see Figures 1 to 4 This application further proposes that the transverse cross-sectional shape of the first deformation part 21 and the second deformation part 41 is U-shaped, S-shaped or Z-shaped.

[0047] In this embodiment, a U-shaped cross-section refers to a transverse cross-section with an open structure. Asymmetrical stress distribution areas are formed by continuous bending of the side walls and bottom. Specifically, this can be achieved using a bending structure with symmetrical or asymmetrical opening widths. The opening direction forms an angle with the driving direction to promote elastic deformation. An S-shaped cross-section refers to a transverse cross-section composed of two continuous bends in opposite directions. Specifically, this can be achieved using a sinusoidal or serpentine bending structure. The alternating extension of the bending segments creates multi-directional deformation compensation capabilities. A Z-shaped cross-section refers to a transverse cross-section with a broken-line layout containing two bending angles. Specifically, this can be achieved using an acute or obtuse angle bending structure. Local stress concentration areas are formed at the bends to enhance the transverse stiffness adjustment capability.

[0048] Specifically, when the main piezoelectric drive module 20 and the auxiliary piezoelectric drive module 40 apply driving voltages respectively, the U-shaped cross-section undergoes asymmetric deformation through the open area, causing the first deformation part 21 to bend in the driving direction while the lateral displacement is absorbed by the open structure. The S-shaped cross-section achieves the coupling conversion of longitudinal and lateral displacements through the alternating expansion and contraction of continuous bending sections during the driving process; its multi-directional deformation characteristics can cancel the motion interference between adjacent drive modules. The Z-shaped cross-section, through the accumulation of local deformation at the bend, increases lateral elasticity while maintaining longitudinal driving stiffness, enabling the second deformation part 41 to accurately transmit the driving displacement to the upper motion frame 50. All three cross-sectional shapes, through geometric topology optimization, change the single deformation mode of the traditional straight structure, allowing the motion interference between the upper and lower motion frames 30 in orthogonal directions to be effectively absorbed by the elastic deformation of the deformation part.

[0049] This solution utilizes the multi-directional deformation characteristics of U-shaped, S-shaped, or Z-shaped cross sections to enable the drive module to absorb motion interference through elastic deformation when generating drive displacement, thus overcoming the motion coupling defects caused by rigid connections.

[0050] Please see Figures 1 to 4 This application further proposes that the width of the first mounting plate 22 is greater than the width of the second mounting plate 42, and the width of the first piezoelectric ceramic 23 is greater than the width of the second piezoelectric ceramic 43.

[0051] In this embodiment, increasing the width of the first mounting plate 22 of the main piezoelectric drive module 20 improves the overall structural rigidity and ensures the stability of deformation transmission during large-stroke drive. Conversely, decreasing the width of the second mounting plate 42 of the auxiliary piezoelectric drive module 40 reduces motion inertia and adapts to the requirements of high-frequency precision displacement. Increasing the width of the first piezoelectric ceramic 23 of the main piezoelectric drive module 20 enhances the driving force output, meeting the high-load drive requirements of the lower motion frame 30. Decreasing the width of the second piezoelectric ceramic 43 of the auxiliary piezoelectric drive module 40 improves the uniformity of electric field distribution, enabling precise displacement control of the upper motion frame 50.

[0052] Existing piezoelectric drive modules mostly use a single size parameter configuration, which cannot meet the combined drive requirements of large stroke and high precision. This solution establishes a size matching relationship between the main piezoelectric drive module 20 and the auxiliary piezoelectric drive module 40, so that the drive system at different levels can obtain the optimal mechanical characteristics.

[0053] Through the above technical solutions, the wide-range structure of the main piezoelectric drive module 20 ensures the stability of the large-stroke drive, while the narrow-range structure of the auxiliary piezoelectric drive module 40 enables rapid response to precise displacement. The two-stage drive system complements each other in terms of spatial layout and mechanical characteristics, ultimately achieving precise control of the composite motion trajectory.

[0054] Please see Figures 1 to 4 This application further proposes that the thickness ratio of the first mounting plate 22 to the first piezoelectric ceramic 23 is less than 2 / 1, and the thickness ratio of the second mounting plate 42 to the second piezoelectric ceramic 43 is less than 2 / 1.

[0055] In this embodiment, the thickness ratio refers to the dimensional ratio of the mounting plate and the corresponding piezoelectric ceramic in the direction perpendicular to the vibration transmission direction. This ratio can be achieved by controlling the thickness of the plate stack through precision machining. This ratio is used to balance the supporting stiffness of the mounting plate with the deformation transmission efficiency of the piezoelectric ceramic.

[0056] Specifically, when the thickness ratio of the first mounting plate 22 to the first piezoelectric ceramic 23 is controlled below 2 / 1, the bending stiffness of the first mounting plate 22 in the main piezoelectric drive module 20 is limited within a reasonable range. This allows the longitudinal expansion and contraction deformation generated by the first piezoelectric ceramic 23 to be effectively converted into bending vibration of the first mounting plate 22, thereby driving the lower motion frame 30 to achieve precise displacement. In the secondary piezoelectric drive module 40, the thickness ratio of the second mounting plate 42 to the second piezoelectric ceramic 43 is also constrained to ensure that the drive response of the upper motion frame 50 is decoupled from the motion direction of the main piezoelectric drive module 20, avoiding vibration phase delay or amplitude attenuation due to excessive mounting plate thickness. By synchronously optimizing the two sets of thickness ratios, the vibration transmission paths of the main and secondary piezoelectric drive modules 40 become complementary, improving the coordination of the composite motion while maintaining structural stability. Preferably, the thickness ratio of the first mounting plate 22 to the first piezoelectric ceramic 23 is 3 / 2.

[0057] This solution avoids the risk of structural instability caused by an excessively thin mounting plate and solves the problem of reduced vibration energy transfer efficiency caused by an excessively thick mounting plate by limiting the thickness ratio of the mounting plate to the piezoelectric ceramic.

[0058] Please see Figures 1 to 4 This application further proposes that both the first support component 60 and the second support component 70 are elastic support arms.

[0059] In this embodiment, the elastic support arm refers to a support structure made of elastic material, specifically a metal spring sheet or a polymer sheet, which has the ability to recover its deformation. By designing the first support component 60 and the second support component 70 as elastic support arms, the elastic support arms are used in the piezoelectric drive module to connect the fixed base 10 with the lower motion frame 30 and the lower motion frame 30 with the upper motion frame 50. Through elastic deformation, the elastic support arms absorb the vibration energy generated by the main piezoelectric drive module 20 and the auxiliary piezoelectric drive module 40, while maintaining the relative positional stability between the motion frames.

[0060] Specifically, when the main piezoelectric drive module 20 drives the lower motion frame 30 to move, the elastic support arm cancels out vibration transmission through its own bending or stretching deformation, avoiding the superposition of vibrations caused by the rigid support structure's inability to deform. When the secondary piezoelectric drive module 40 drives the upper motion frame 50 to move, the elastic support arm further isolates the vibration interference between the upper and lower motion frames 30, making the movements of the main and secondary piezoelectric drive modules 40 independent of each other. The flexible characteristics of the elastic support arm allow each motion frame to generate minute displacements during the driving process, while the displacement range is constrained by the elastic restoring force, thereby achieving precise control of the composite motion trajectory.

[0061] In some specific embodiments, the cross-sectional shape of the elastic support arm can be rectangular or trapezoidal, and its thickness can be adjusted according to the actual load requirements. For example, using multi-layered stacked metal sheets as the elastic support arm can enhance the deformation absorption capacity; using a composite structure of polymer materials and metal can balance elasticity and stiffness.

[0062] Compared with existing technologies, traditional support components mostly use rigid linkages or fixed brackets, which cannot effectively absorb vibration energy. This leads to the vibration of the main and auxiliary piezoelectric drive modules 40 being mutually coupled, affecting the motion accuracy of the actuator 1. This solution replaces the rigid structure with an elastic support arm, utilizing its deformation characteristics to block the vibration transmission path, thus solving the inherent defects of rigid supports in dynamic driving scenarios.

[0063] Through the above technical solution, this application can reduce the vibration interference between the main and auxiliary piezoelectric drive modules 40, ensure the independent motion control of the upper and lower motion frames 30, thereby improving the motion stability of the piezoelectric drive module and the drive accuracy of the actuator 1.

[0064] Please see Figure 1 The present invention also proposes a projection device, which includes a housing, a light source, an imaging module, a dissipation plate, and a piezoelectric drive module. The light source, imaging module, dissipation plate, and piezoelectric drive module are all installed within the housing, and the piezoelectric drive module is drively connected to the dissipation plate. The specific structure of the piezoelectric drive module is as described in the above embodiments. Since this projection device adopts all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated further here.

[0065] A piezoelectric drive module refers to a drive device capable of generating composite motion trajectories. Specifically, it can be achieved through the coordinated action of a main piezoelectric drive module 20 and a secondary piezoelectric drive module 40. The main piezoelectric drive module 20 drives the lower motion frame 30 along a first direction, and the secondary piezoelectric drive module 40 drives the upper motion frame 50 along a second direction. Multidimensional motion output is achieved by independently controlling the vibration frequency and phase difference of the two modules. A dissipation plate is an optical element used to adjust the optical path. It can be made of a transparent material with a periodic microstructure, and its displacement accuracy directly affects the projection imaging quality. The transmission connection refers to the motion transmission relationship between the piezoelectric drive module and the dissipation plate. This can be achieved through mechanical linkages, flexible hinges, or direct rigid fixing to ensure that the dissipation plate accurately follows the composite motion trajectory of the piezoelectric drive module.

[0066] Specifically, the outer shell serves as the mounting carrier, internally integrating a light source and imaging module to generate projected images. A dissipation plate is located in the optical path to optimize optical performance. The main piezoelectric drive module 20 of the piezoelectric drive module drives the lower motion frame 30 to generate a first-direction displacement through piezoelectric ceramic deformation, while the secondary piezoelectric drive module 40 drives the upper motion frame 50 to generate a second-direction displacement through the deformation of another piezoelectric ceramic. The two components are superimposed to form a composite motion trajectory. The dissipation plate is linked to the upper motion frame 50 via a transmission connection, thereby achieving multi-dimensional micro-displacement adjustment in the optical path. Because the vibration control of the main and secondary piezoelectric drive modules 40 is independent, the magnetic field interference problem of traditional dual electromagnetic actuators is avoided, and the high-frequency response characteristics of the piezoelectric ceramic improve displacement accuracy.

[0067] Compared to existing technologies, the motion trajectory of the two actuators in a traditional dual-electromagnetic vibration motor is limited due to magnetic field coupling. This solution, however, uses a piezoelectric drive module with independent main and auxiliary modules, achieving interference-free composite motion through non-contact piezoelectric deformation. In existing technologies, the single-degree-of-freedom adjustment of the dissipation plate is insufficient for complex optical path requirements. This solution, through the bidirectional motion superposition of the piezoelectric drive module, enables the dissipation plate to achieve two-dimensional or even three-dimensional displacement within the projection device, thereby more accurately correcting the light spot shape and energy distribution.

[0068] Through the above technical solution, this application solves the problem of a single motion trajectory caused by magnetic field interference in traditional dual electromagnetic drives, enabling the defocusing plate to complete complex displacement adjustments according to optical requirements, such as simultaneously compensating for lateral chromatic aberration and longitudinal defocus in the projection optical path, thereby improving image clarity and color uniformity. The high-frequency response characteristics of the piezoelectric drive module also shorten the adjustment time of the defocusing plate, adapting to dynamic optical compensation scenarios.

[0069] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A piezoelectric drive module, characterized in that, The piezoelectric drive module includes: Fixed base; A main piezoelectric drive module, one end of which is connected to the fixed base; The lower motion frame is connected to the other end of the main piezoelectric drive module; A secondary piezoelectric drive module, one end of which is fixed to the lower moving frame; and An upper motion frame is connected to the other end of the auxiliary piezoelectric drive module, and the upper motion frame is used to install the actuator. The main piezoelectric drive module is used to drive the lower motion frame to move in one direction, and the auxiliary piezoelectric drive module is used to drive the upper motion frame to move in another direction.

2. The piezoelectric drive module as described in claim 1, characterized in that, One end of the main piezoelectric drive module is connected to one side of the lower moving frame, and one end of the auxiliary piezoelectric drive module is fixed to the other side of the lower moving frame. The main piezoelectric drive module and the auxiliary piezoelectric drive module are located on adjacent sides of the lower moving frame.

3. The piezoelectric drive module as described in claim 2, characterized in that, The piezoelectric drive module further includes a first support component and a second support component. The two ends of the first support component are respectively connected to the fixed base and the lower motion frame, and the two ends of the second support component are respectively connected to the lower motion frame and the upper motion frame. The first support component is symmetrically arranged with the main piezoelectric drive module, and the second support component is symmetrically arranged with the auxiliary piezoelectric drive module.

4. The piezoelectric drive module as described in claim 1, characterized in that, The main piezoelectric drive module includes: A first deformable part, one end of which is connected to the fixed base; A first mounting plate, one end of which is connected to the other end of the first deformable part; A first piezoelectric ceramic, disposed on the first mounting plate, is used for connection to an external power source; and The first connecting part has two ends connected to the other end of the first mounting plate and the lower moving frame, respectively. The first piezoelectric ceramic is used to drive the first mounting plate and the lower motion frame to vibrate synchronously.

5. The piezoelectric drive module as described in claim 4, characterized in that, The secondary piezoelectric drive module includes: The second deformation part, one end of which is connected to the lower moving frame; A second mounting plate, one end of which is connected to the other end of the second deformable part; A second piezoelectric ceramic, disposed on the second mounting plate, is used for connection to an external power source; and The second connecting part has two ends connected to the other end of the second mounting plate and the upper motion frame, respectively. The second piezoelectric ceramic is used to drive the second mounting plate and the upper motion frame to vibrate synchronously.

6. The piezoelectric drive module as described in claim 5, characterized in that, The transverse cross-sectional shape of both the first deformed part and the second deformed part is U-shaped, S-shaped or Z-shaped.

7. The piezoelectric drive module as described in claim 5, characterized in that, The width of the first mounting plate is greater than the width of the second mounting plate; And / or, the width of the first piezoelectric ceramic is greater than the width of the second piezoelectric ceramic.

8. The piezoelectric drive module as described in claim 5, characterized in that, The thickness ratio of the first mounting plate to the first piezoelectric ceramic is less than 2 / 1; The thickness ratio of the second mounting plate to the second piezoelectric ceramic is less than 2 / 1.

9. The piezoelectric drive module as described in claim 5, characterized in that, Both the first support component and the second support component are elastic support arms.

10. A projection device, characterized in that, The projection device includes a housing, a light source, an imaging module, a scattering plate, and a piezoelectric drive module as described in any one of claims 1 to 9. The light source, the imaging module, the scattering plate, and the piezoelectric drive module are all installed inside the housing, and the piezoelectric drive module is drively connected to the scattering plate.

Images