Piezoelectric Actuator Frame Structure for Adhesive Overflow Control
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Solution Overview
Problem
The adhesion properties between components in fluid pumps, particularly those generating vibration, are insufficient due to adhesive extension beyond the intended boundaries, leading to reduced reliability.
Innovation Solution
The design incorporates a frame with a projection portion that increases the adhesion area by adhering to the outer edge of the vibrating member and lid member, enhancing the adhesion strength and preventing adhesive overflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive is applied to adhere the frame and lid portion to the vibrating member, then adhesion is achieved, but adhesive extends beyond boundaries reducing reliability
Solution Approach 1:
The frame is designed with a projection portion that extends in the thickness direction (vertical dimension) from the adhesive application surface. This dimensional extension creates a stepped structure where the projection portion provides additional adhesion area while preventing adhesive from spreading laterally beyond the intended boundary, thus resolving the contradiction between achieving strong adhesion and preventing adhesive overflow that reduces reliability
Solution Approach 2:
The projection portion is strategically positioned at specific locations on the frame where enhanced adhesion is needed. This local structural modification concentrates adhesion strength at critical areas without requiring uniform adhesive application across the entire surface, preventing overflow while ensuring reliable bonding where most needed
2Strength
If adhesive application area is increased to improve adhesion properties, then adhesion strength improves, but adhesive overflow increases
Solution Approach 1:
The projection portion extends vertically from the frame in the thickness direction, creating a stepped adhesive application surface. This dimensional change allows the adhesive to be applied over a larger effective area on the projection portion while the vertical step structure physically contains the adhesive and prevents it from overflowing laterally beyond the frame's outer edge
3Reliability
If frame outer edge shape is made smaller than vibrating member outer edge, then adhesive containment is improved, but adhesion area is reduced
Solution Approach 1:
While the frame's planar outer edge shape is kept smaller than the vibrating member's outer edge to contain adhesive, the projection portion extends in the thickness direction to compensate for the reduced planar area. This vertical extension creates additional adhesion surface area, thereby maintaining strong adhesion properties while preventing adhesive overflow
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 improves the adhesion properties and reliability of the actuator, ensuring stable operation and reduced leakage of vibration, while maintaining a uniform shape and suppressing unnecessary vibration.
Implementation Method 1
a piezoelectric element mounted on at least one of the first main surface and the second main surface
Implementation Method 2
The frame and the first main surface or the second main surface in the outer edge portion of the vibrating member are adhered to each other with the adhesive
Data Source
AI summary
An actuator includes a vibrating member, a frame, and an adhesive. The vibrating member includes a main surface and a main surface, and a piezoelectric element is mounted on the main surface. The vibrating member has a plate shape and includes an outer edge portion having a greater shape than the piezoelectric element in plan view and not abutting the piezoelectric element). The frame has an outer edge shape that is smaller than the vibrating member. The frame and the main surface in the outer edge portion of the vibrating member are adhered to each other with the adhesive. In plan view, the outer edge shape of the frame is smaller than an outer shape of the outer edge portion of the vibrating member. The frame includes a projection portion that projects outward from part of an outer edge.