Abstract
In order to improve the response speed and output force of the camera focusing mechanism, the authors proposed a novelty micro focusing mechanism based on piezoelectric driving, which has the characteristics of rapid response, high precision positioning and large displacement focusing. In this paper, the operating principle of the proposed focusing mechanism is presented. Using the piezoelectric output characteristic, the movable tooth drive theory and the screw drive theory, the electromechanical coupling mechanical model and equations of the piezoelectric focusing mechanism are established. Through MATLAB simulation, the output characteristics of the piezoelectric focusing mechanism are calculated. The results indicate that the maximum thrust force of the lens and the maximum output torque of the movable tooth drive for the piezoelectric focusing mechanism are 562.5 N and 1.16 Nm, respectively. Furthermore, the driving voltage directly affects the output performance of the piezoelectric focusing mechanism. These results can be utilized both to optimize the dimensions and improve the overall performance of the piezo-driven focusing mechanism.
Highlights
The rapid development of intelligent manufacturing has propelled electromechanical and microelectromechanical systems to pursue high precision, integration and intelligence [1,2,3,4]
In order to realize the rapid response, high precision positioning and large displacement focusing of the focusing mechanism, a cylindrical macro focusing mechanism based on piezoelectric drive, is proposed in this paper
Applying those conditions and Equation (6), the output forces of the piezoelectric actuator are investigated as shown in Figure 8, where sub-figure a shows the output forces of the different piezo-actuator, whereas Figure 8b–f represent the changes of output forces with different peak voltage, piezoelectric strain constant, elastic modulus of piezoelectric actuator, thickness of piezoelectric layer and sectional area of piezoelectric actuator
Summary
The rapid development of intelligent manufacturing has propelled electromechanical and microelectromechanical systems to pursue high precision, integration and intelligence [1,2,3,4]. Piezoelectric element has many excellent performances, such as fast response, small size, large output force and no electromagnetic interference As a result, it has been successfully used in the field of robot actuating, precision positioning, energy harvesting and vibration reduction [10,11,12,13]. The driving of the camera focusing mechanism is an important application of piezoelectric actuation in the precise positioning field. Japanese researcher Masahiko et al [16] applied a spherical piezoelectric ultrasonic motor to achieve the positioning and driving of the camera inside the tube. In order to realize the rapid response, high precision positioning and large displacement focusing of the focusing mechanism, a cylindrical macro focusing mechanism based on piezoelectric drive, is proposed in this paper. The research results lay a theoretical foundation for the application of piezoelectric drive in the focusing mechanism
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