Piezoelectric driving platform based on perforation at flexible hinge and control method

Abstract

The invention provides an optical focusing device which is based on piezoelectric stick-slip driving and belongs to the technical field of optics. The device is composed of an upper end cover, a linear guide rail set, a piezoelectric stick-slip driven stator, a piezoelectric stack, a pre-tightening device, an optical focusing lens and a lower end cover. The invention relates to an optical focus device with piezoelectricity as driving force. Piezoelectric stacks are adopted as a power source, stick-slip motion of the piezoelectric stick-slip driving stator is achieved, and then the linear guide rail is driven. The optical focusing device is fixed on the linear guide rail through a bolt and realizes a focusing or imaging function by utilizing an imaging principle. The invention not only has practical value, but also provides a design solution which is reliable, stable, high in efficiency and low in energy consumption for the modern focusing imaging technology, and is particularly outstanding in practical application scenes with serious electromagnetic interference. By adopting the structural design, the problems of poor focusing effect and overhigh cost caused by external interference in the prior art can be effectively solved. And meanwhile, the light distribution in the focusing area is more balanced, and the blurring degree of the image edge is reduced, so that the quality of visual perception is improved.

Description

Technical Field

[0001] This invention patent has a wide range of applications. It can achieve focusing or imaging of objects in optical imaging systems, and provide clear and sharp images for photography, videography, telescopes, optical measurement and other fields. Background Art

[0002] Piezoelectric-driven optical focusing devices are a key technology for achieving object focusing or imaging in optical imaging systems. Over the past few decades, optical imaging technology has made tremendous progress, from traditional optical lenses to modern digital imaging systems, continuously improving image quality and imaging performance.

[0003] A piezoelectric stack is a commonly used piezoelectric actuation method. When voltage is applied, the piezoelectric layer deforms, driving the stator and optical focusing mechanism to achieve stick-slip motion. By adjusting the voltage, the direction and speed of the focusing mechanism can be controlled, enabling precise adjustment and focusing of the light beam.

[0004] Optical focusing devices based on piezoelectric actuation are a promising technology with broad application prospects. They overcome the limitations of traditional mechanical actuation methods, provide fast and precise focusing capabilities, and lay a solid foundation for the development and innovation of modern optical imaging systems. With the continuous optimization of piezoelectric stick-slip actuation device design, this field will continue to achieve significant breakthroughs and applications. Summary of the Invention

[0005] The purpose of this patent is to overcome existing technical shortcomings. For example, conventional optical focusing devices typically use mechanical drive methods, such as screw drives or linear guides. However, these mechanical drive methods have limitations, such as slow response speed, limited accuracy, and high noise, which restrict the performance and application range of imaging systems.

[0006] The technical solution of the present invention to achieve the above purpose is:

[0007] The rowing motion-type piezoelectric drive can be combined with bolts fixed to the linear guide rail. It drives the stator through piezoelectric superposition and piezoelectric stick-slip motion, combined with imaging technology, to ultimately achieve a clear and reasonable imaging effect; the piezoelectric stack is driven by an appropriate voltage, so that the piezoelectric stick-slip drive stator can achieve periodic changes; the periodic changes of the piezoelectric stick-slip drive stator can drive the movement of the linear guide rail, and theoretically can achieve infinite stroke movement; the preload device can adjust the distance between the piezoelectric stick-slip device and the linear guide rail through a knob to increase the preload force and ultimately achieve a reasonable output force; the optical focusing mirror uses a piezoelectric stick-slip drive device to adjust its distance, and combined with the basic principles of imaging, to achieve a clear and sharp imaging effect. This solution effectively solves the problem of insufficient environmental adaptability of traditional optical focusing mirrors due to their overly simple structure, and exhibits excellent stability.

[0008] The structural features of the patent of this invention are:

[0009] The series of devices can be assembled and connected for use by simple linking methods such as bolts and ethyl α-cyanoacrylate.

[0010] The upper and lower end covers can be made of aluminum alloy or stainless steel through simple milling and connected with bolts to achieve sealing and prevent debris from contaminating the internal environment.

[0011] The optical focusing lens is highly replaceable to realize different application scenarios.

[0012] The piezoelectric stick-slip drive device can be made of aluminum alloy 7075\65 manganese.

[0013] The linear guide rail serves as the output of the focusing mechanism. The fixed portion is bonded with ethyl α-cyanoacrylate into the milled groove of the lower end cap. To prevent any interference with movement, the fixed portion is fitted with an interference fit. The movable portion is bolted to the optical focusing mechanism, achieving the desired image in accordance with the imaging principle.

[0014] The piezoelectric-driven optical focusing device of this invention features a novel and ingenious design. It quantitatively adjusts the preload force of the drive mechanism, addressing preload fluctuations caused by manufacturing and assembly errors, and outputs stable and reliable linear precision displacement. The device boasts a small size, compact structure, and simple control, making it suitable for fields such as medical engineering and precision instrument operation. It offers advantages such as high load output and high positioning accuracy, and can achieve long-range displacement output. This device is of great significance to the development of my country's optical focusing field and holds broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The illustrated drawings are used to provide further understanding of the present invention and constitute a part of this application. The illustrative examples of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 It is a schematic diagram of the upper end cover of the present invention;

[0018] Figure 3 is a schematic diagram of an optical focusing lens of the present invention;

[0019] Figure 4 Schematic diagram of the linear guide rail of the present invention;

[0020] Figure 5 This is a schematic diagram of the compliant mechanism module of the present invention;

[0021] Figure 6 It is a schematic diagram of the pre-tightening device of the present invention;

[0022] Figure 7 It is a schematic diagram of the lower end cover of the present invention.

[0023] 1. Upper end cover of focusing device; 2. Circular optical focusing lens; 3. Linear guide rail group of optical focusing device; 3-1. Mover of linear guide rail group; 3-2. Cylindrical ball group of linear guide rail group; 3-3. Fixed end of linear guide rail group; 4. Piezoelectric driven compliance mechanism module; 4-1. Piezoelectric stack; 4-2. Kimi pre-tightening bolt; 4-3. Wedge-shaped gasket; 4-4. Flexible mechanism with perforation; 5. Pre-tightening device; 5-1. Spiral pre-tightening device; 5-2. Wedge-shaped fixing gasket; 6. Lower end cover of focusing device; 6-1. Fixing hole of pre-tightening device; 6-2. Opening groove of lower end cover. DETAILED DESCRIPTION

[0024] The details of the present invention and its specific implementation methods are further described below with reference to the accompanying drawings.

[0025] refer to Figures 1 to 7 As shown, the present invention features a high-precision piezoelectric-driven focusing device with a movable bidirectional stator. This operation is completely automated by the piezoelectric stack, eliminating the need for complex manual operations. Positioning accuracy can be customized based on the actual application scenario, resulting in a high-definition, low-error imaging device. This device overcomes failure and damage caused by harsh operating environments, maintaining stable and reliable performance. Its simple structure and ease of operation make it suitable for applications in medical engineering, precision instrumentation, and other fields. The operating range is determined by the length of the guide rail, and the upper end cap includes an opening for the guide rail to be moved.

[0026] See also Figure 2As shown, the upper end cap of the present invention protects the internal drive components of the focusing device, preventing foreign matter from entering the drive device and potentially damaging it. The upper end cap is a symmetrical structure, with three components arranged in a triangular pattern, providing a stable, fixed constraint. If internal components become damaged or operate abnormally, they can be repaired or replaced to ensure the normal operation and safety of the focusing device. Furthermore, the device, when used in conjunction with the lower end cap, can reduce noise generated by the operation of the piezoelectric stack.

[0027] See also Figure 3 As shown, the optical focusing lens of the present invention is fixed to the mover of the linear guide assembly with epoxy resin. When the piezoelectric compliance mechanism module is stimulated, it drives the mover to move, ultimately producing high-definition imaging results based on the imaging principle. Furthermore, this optical focusing lens is not the only one and can be replaced according to actual working conditions.

[0028] See also Figure 4 The linear guide assembly of the present invention is shown in Figure 3-1. The linear guide assembly's mover and optical focusing lens 2 are bonded together with epoxy resin. The cylindrical ball bearings 3-2 can be replaced with other suitable rollers as needed. 3-3 are placed in the slots in the lower end cap. These two components are secured together with bolts, allowing for easy replacement and repair in the event of damage.

[0029] See also Figure 5 Figure 4 shows the compliant stator mechanism module of the present invention. 4-1 is the piezoelectric stack. When stimulated by a periodic signal, the compliant stator mechanism also undergoes periodic motion. 4-2 is the preload bolt. Because the piezoelectric stack and the compliant stator have a clearance fit, a certain preload force must be applied to achieve optimal drive. 4-3 is the gasket, which provides protection by preventing excessive preload from damaging the piezoelectric stack. 4-4 is the perforation at the flexible hinge to ensure maximum amplification, improve the output performance of the linear actuator, and reduce displacement setback.

[0030] Install the four piezoelectrically driven compliance modules at appropriate locations on the linear guide. Then connect the power supply and control circuitry to supply voltage to the piezoelectrically driven compliance modules. By adjusting the voltage level and frequency, the deformation and movement speed of the 4-1 piezoelectric stack can be controlled. Once voltage is applied to the four piezoelectrically driven compliance modules, the 4-1 piezoelectric stack deforms. This deformation generates a mechanical force, which is transmitted to the linear guide through the connecting device. The linear guide moves in response to the deformation of the 4-1 piezoelectric stack, thus achieving linear motion of the three-line linear guide assembly.

[0031] See also Figure 6As shown, the preload device of the present invention. 5 The two holes of the preload device are fixed with two holes of the flexible stator mechanism module by bolts; 5-1 is a spiral preload device that adjusts the preload force between the flexible stator mechanism module and the linear guide rail to adjust the corresponding working efficiency; 5-2 is a wedge preload device that can ensure high preload force and high self-locking performance between the flexible stator mechanism module and the linear guide rail while also ensuring durability and reliability.

[0032] The four piezoelectrically driven compliance modules and the five preload devices will be installed to adjust the proper position of the linear guide rails. The power supply and control circuitry will then be connected to supply voltage to the four piezoelectrically driven compliance modules. By adjusting the voltage level and frequency, the deformation and movement speed of the 4-1 piezoelectric stack can be controlled. Once voltage is applied to the four piezoelectrically driven compliance modules, the 4-1 piezoelectric stack deforms. This deformation generates a mechanical force, which is transmitted to the linear guide rails through the connecting device. The linear guide rails move in response to the deformation of the 4-1 piezoelectric stack, thus achieving linear motion of the three linear guide rails.

[0033] See also Figure 7 As shown, the pre-tightening device of the present invention. 6-1 is the opening of the lower end cover that cooperates with the pre-tightening device to facilitate installation and removal of the pre-tightening device; 6-2 is the opening slot of the lower end cover that facilitates installation and removal of the linear guide rail, playing a supporting and fixing role, so that the entire device can be installed and used normally.

Claims

1. A piezoelectric stick-slip optical focusing device based on the stick-slip principle, characterized in that: The system comprises 1 an upper end cover, (2) an optical focusing lens, (3) a linear guide rail assembly, (4) a piezoelectric stick-slip drive stator, (5) a preload device, and (6) a lower end cover. The (3) linear guide rail (3-3) lower guide rail is mounted on the lower end cover, firstly by gluing with epoxy resin, and then by fixing the assembly with bolts to prevent the lower guide rail from moving and causing motion errors. At the same time, the lower end cover can provide a certain fixed support function so that each part of the mechanism can realize its respective function in an orderly manner. At the same time, it can also provide a stable and closed working environment without external interference for the whole system.

2. The (3) linear guide rail assembly according to claim 1 drives the (2) optical focusing lens, and adjusts the distance between the imaged object and the optical focusing lens through the imaging principle to form an image; (4) the piezoelectric stick-slip drive stator is used to drive the (3) linear guide rail assembly, converting the electrical energy of the (4-1) piezoelectric stack into mechanical energy of the linear guide rail, and then converting the mechanical energy into information and transmitting it to the user.

3. The (5) preload device according to claim 1 serves to fix the position of the (4) piezoelectric stick-slip drive stator, provide a distance between the (4) piezoelectric stick-slip drive stator and the (3) linear guide rail, so as to apply a suitable preload force, adjust the output performance, and provide a stable working environment for the piezoelectric stick-slip drive stator.

4. A piezoelectric stick-slip (2) optical focusing device based on the stick-slip principle according to claim 1, characterized in that: The (1) upper and (6) lower end covers are sealed by bolts that are centrally symmetrical, with the three bolts on the left arranged in a triangular pattern, providing a stable, fixed seal. The lower end cover has a slot for the linear guide rail, which facilitates the fixing of the lower half of the linear guide rail. The slot also has bolt holes that provide a high-strength connection and adaptability, which can provide a certain degree of shock resistance and loosening resistance. Finally, the upper and lower end covers also have a certain amount of cutting margin to facilitate the normal operation of the linear guide rail.

5. The piezoelectric stick-slip drive stator according to claim 2 (4) is characterized in that The compliant mechanism features a perforated structure (4-4) that amplifies single-step displacement, minimizing the stick-slip effect and ultimately improving performance. Furthermore, two piezoelectric stick-slip actuators are symmetrically positioned about the linear guide, enabling bidirectional motion. This eliminates the need for excitation signals and manual resetting of the optical focusing mechanism.

6. The pre-tightening device according to claim 3 (5), characterized in that The (5) pre-tightening device 5-1 is a spiral pre-tightening device, which is used to adjust the pre-tightening force of the flexible stator mechanism module on the linear guide rail to adjust the corresponding working efficiency; 5-2 is a wedge-shaped pre-tightening device, which can ensure the high pre-tightening force and high self-locking property of the flexible stator mechanism module on the linear guide rail, while ensuring durability and reliability.

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