Piezoelectric Displacement Magnifying Mechanism With Single-Element Control
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Solution Overview
Problem
Existing displacement magnifying mechanisms using two piezoelectric elements require complex control systems, making it difficult to manage the drive system effectively.
Innovation Solution
A displacement magnifying mechanism utilizing a single piezoelectric element with a support member, compression member, and specific rigidity and thermal expansion coefficient configurations to simplify control and reduce tensile stress on the piezoelectric element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If two piezoelectric elements are used to increase displacement output, then the displacement amount is effectively increased, but the control system becomes complex
Solution Approach 1:
The mechanism is divided into two functional segments: a piezoelectric element for generating force and a support member for providing structural stability. This segmentation allows each component to be optimized independently, with the piezoelectric element focused on displacement generation and the support member on mechanical stability, thereby simplifying control while achieving effective displacement magnification.
Solution Approach 2:
The support member acts as an intermediary between the piezoelectric element and the operating portion. It receives the force from the piezoelectric element and transmits it to the operating portion while maintaining structural stability, enabling displacement magnification without requiring complex control of multiple piezoelectric elements.
2Reliability
If a displacement magnifying mechanism is designed to reduce tensile stress on the piezoelectric element, then the risk of damage is reduced, but the structural design becomes more complex
Solution Approach 1:
The compression member provides a counteracting compressive force that balances the tensile stress generated by the piezoelectric element during operation. By introducing this opposing force, the net tensile stress on the piezoelectric element is reduced, preventing damage without requiring complex structural modifications.
Solution Approach 2:
The rigidity of the support member is specifically designed to be greater than or equal to the rigidity of the piezoelectric element along the first longitudinal direction. This parameter change in structural rigidity allows the support member to bear the mechanical load, reducing tensile stress on the piezoelectric element while maintaining a relatively simple overall structure.
3Strength
If the support member has high rigidity to maintain structural stability, then the displacement magnification is improved, but the thermal expansion mismatch becomes more significant
Solution Approach 1:
The connecting member is specifically designed with a thermal expansion coefficient higher than that of the support member. This deliberate thermal expansion property allows the connecting member to compensate for thermal expansion differences between the piezoelectric element and support member during temperature changes, preventing stress concentration and maintaining the high rigidity of the support member without suffering from thermal expansion mismatch.
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
Facilitates easy control of the drive system and reduces the risk of damage to the piezoelectric element by alleviating tensile loads, enhancing energy efficiency and displacement output.
Implementation Method 1
a piezoelectric element of which an end portion is attached to a mounting surface of the base portion, the piezoelectric element extending along a first longitudinal direction
Implementation Method 2
a compression member attached to each of the base portion and the operating portion so as to compress the piezoelectric element along the first longitudinal direction
Implementation Method 3
the connecting member may be formed with a material of which a thermal expansion coefficient is higher than that of the support member
Data Source
AI summary
A displacement magnifying mechanism, polishing device, actuator, electronic component processing apparatus, dispenser, and air valve which can easily control a drive system. The displacement magnifying mechanism includes a base; a piezoelectric element of which an end is attached to a mounting surface of the base, the piezoelectric element extending along a first longitudinal direction; a support member of which an end is attached to the mounting surface side by side with the piezoelectric element, the support member extending along a second longitudinal direction which intersects with the first longitudinal direction; an operating portion attached to each of other ends of the piezoelectric element and the support member to allow the operating portion to be displaced, in response to an expansion/contraction of the piezoelectric element, along a displacement direction; and a compression member attached to the base and the operating portion so as to compress the piezoelectric element.