Piezo-electric Element Pocket Structure for MEMS Bending
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Solution Overview
Problem
Existing dither reeds and cantilevered beams in MEMS systems require higher voltages or limited oscillation ranges due to the conventional attachment of piezo-electric elements, which restricts their bending capability.
Innovation Solution
A bendable apparatus with a flexible material and strategically positioned piezo-electric elements, where the element's edge surfaces apply forces to constraining surfaces, enhancing bending by forming a pocket structure that amplifies the bending force, allowing for greater oscillation ranges or reduced voltage requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a piezo-electric element is conventionally attached to a dither reed or cantilevered beam, then the structure is simple and easy to manufacture, but the bending capability is limited and higher voltages are required
Solution Approach 1:
The patent transitions from conventional surface attachment to a three-dimensional pocket integration approach. The piezo-electric element is embedded within a pocket structure that extends vertically from the surface, allowing the element to engage with constraining surfaces on multiple faces (top, bottom, and side surfaces). This dimensional change enables the piezo-electric element to apply force more effectively in multiple directions, significantly enhancing the bending capability and reducing the voltage required to achieve the same oscillation range.
Solution Approach 2:
The pocket structure acts as an intermediary mechanism between the piezo-electric element and the dither reed or cantilevered beam. By embedding the piezo-electric element within the pocket and allowing its edge surfaces to contact the constraining surfaces, the pocket structure amplifies the force transmission efficiency. This intermediary structure enables better mechanical coupling and force application, resolving the contradiction between limited bending capability and high voltage requirements.
2Length of moving object
If a piezo-electric element is conventionally attached to a dither reed, then the attachment method is simple, but the oscillation range is limited
Solution Approach 1:
The pocket structure introduces a vertical dimension to the attachment geometry, allowing the piezo-electric element to engage with constraining surfaces on multiple faces. This three-dimensional configuration enables greater deflection and oscillation range compared to conventional surface attachment, as the piezo-electric element can apply force more effectively throughout its length while being constrained on multiple surfaces.
Solution Approach 2:
The pocket structure segments the attachment region into distinct functional zones: the pocket walls provide constraining surfaces, the piezo-electric element provides the actuating force, and the embedded configuration creates clear separation between the actuator and the flexible element. This segmentation allows each component to perform its function optimally, achieving greater oscillation range through improved force application geometry.
3Force
If the piezo-electric element is fixedly attached on the first-surface with edge surfaces perpendicular to the first-surface, then the force application is optimized, but the manufacturing precision requirements increase
Solution Approach 1:
The pocket structure is formed in advance during the manufacturing process, creating pre-defined constraining surfaces with the required geometry and orientation. By forming the pocket structure first (through molding, machining, or additive manufacturing), the alignment requirements for the piezo-electric element are simplified - the element only needs to be placed within the pocket, and the pocket walls automatically provide the perpendicular constraining surfaces. This preliminary action reduces the actual assembly precision requirements while maintaining optimized force application.
Solution Approach 2:
The pocket structure with its perpendicular constraining surfaces automatically provides the alignment and orientation needed for optimal force application. The geometry of the pocket itself enforces the correct orientation of the piezo-electric element, making the system self-aligning. This self-service approach reduces the need for high-precision external alignment procedures while maintaining the force application efficiency provided by the perpendicular edge surface configuration.
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
The apparatus achieves increased bending flexibility with the same voltage or reduces voltage needs for the same oscillation range, improving the performance of dither reeds and cantilevered beams in MEMS systems.
Implementation Method 1
When a voltage is applied to the piezo-electric element, the piezo-electric element expands in length
Data Source
AI summary
A bendable apparatus is provided. The flexible material has a first-surface spanned by a first direction and a second direction. The bendable apparatus also includes a first-constraining surface one of: formed in the first-surface of the flexible material; or attached to the first-surface of the flexible material; and a piezo-electric element including a first-edge surface and a second-edge surface opposing the first-edge surface. The piezo-electric element is fixedly attached on the first-surface of the flexible material, so that: the first-edge surface and the second-edge surface are at least approximately perpendicular to the first-surface of the flexible material, and the first-constraining surface is adjacent to the first-edge surface of the piezo-electric element. When a voltage is applied to the piezo-electric element, the piezo-electric element expands in length, the first-edge surface of the piezo-electric element applies a force on the first-constraining surface, and the flexible material bends.