Piezoelectric Drive Plate Spring Asymmetry
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Solution Overview
Problem
Existing piezoelectric drive devices face inefficiencies in transmitting drive force due to unintended shifting of the vibrating body caused by deflection or contortion of the spring member, leading to unstable operation and potential abrasion.
Innovation Solution
The piezoelectric drive device incorporates a first plate spring part with a unique cross-sectional shape, where the volume of the portion farther from the vibrating part is larger, preventing warping and contortion, and a second plate spring part with a symmetrical shape to stabilize the drive force transmission, ensuring efficient and stable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional spring member is used to bias the vibrating part, then the vibrating part can be biased toward the driven part, but the spring member deflects or contorts causing the vibrating part to shift in an unintended direction, reducing drive force transmission efficiency
Solution Approach 1:
The plate spring part employs an asymmetric cross-sectional shape where the volume of the second portion (farther from the vibrating part) is larger than the volume of the first portion (closer to the vibrating part). This asymmetric volume distribution prevents warping and contortion of the plate spring part, thereby preventing unintended shifting of the vibrating part while maintaining biasing force, thus resolving the contradiction between drive force transmission efficiency and position stability.
2Stability of the object's composition
If the spring member is made more rigid to prevent deflection, then position stability improves, but the biasing force becomes insufficient and drive force transmission efficiency decreases
Solution Approach 1:
The plate spring part features non-uniform cross-sectional volumes along its length, with the second portion having a larger volume than the first portion. This local variation in volume creates different stiffness characteristics in different sections: the first portion near the vibrating part maintains flexibility to provide sufficient biasing force, while the larger-volume second portion provides greater rigidity to prevent warping and contortion, thus simultaneously achieving position stability and adequate biasing force.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively prevents shifting and tilting of the vibrating part, allowing for efficient and stable drive force transmission to the rotor, reducing abrasion and enhancing the overall performance of the piezoelectric drive device.
Implementation Method 1
a vibrating part which has a piezoelectric element (32), and drives a driven part (40) using the piezoelectric element
Implementation Method 2
a first plate spring part (63) configured to bias the vibrating part (31) in a first direction (X direction) from the vibrating part (31) toward the driven part (40)
Data Source
AI summary
A piezoelectric drive device includes a vibrating part which has a piezoelectric element, and drives a driven part using the piezoelectric element, and a first plate spring part configured to bias the vibrating part in a first direction from the vibrating part toward the driven part. The first plate spring part extends toward a second direction crossing the first direction, the first plate spring part is disposed so as to be opposed to the vibrating part in a third direction perpendicular to the first direction and the second direction, and when dividing the first plate spring part into a first portion and a second portion farther from the vibrating part than the first portion so that a length along the third direction is equally divided, a volume of the second portion is larger than a volume of the first portion.