Piezoelectric Element Device Parallel Coupling High Density Load Detection
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Solution Overview
Problem
Existing piezoelectric element devices used in tactile sensors face challenges in achieving high density placement of piezoelectric elements due to the need for individual wiring, which limits the resolution of load detection.
Innovation Solution
A piezoelectric element device with a substrate featuring a plurality of vibrating portions and a resin layer covering a piezoelectric element group, where piezoelectric elements are coupled in parallel, allowing load detectors to resonate at distinct resonance frequencies that change with applied loads without overlapping ranges, enabling high-density placement and improved resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If individual wirings are coupled to each piezoelectric element to detect distance changes, then load detection capability is achieved, but device complexity increases and piezoelectric element density decreases
Solution Approach 1:
Multiple piezoelectric elements are electrically connected in parallel to form a single piezoelectric element group, merging their functions. This allows the group to be controlled by a single wiring instead of individual wirings for each element, reducing wiring complexity while maintaining load detection capability through resonance frequency analysis
2Measurement precision
If individual wirings are coupled to each piezoelectric element, then each element can be individually controlled, but the space required for wiring increases reducing element density
Solution Approach 1:
The patent merges multiple piezoelectric elements into parallel-connected groups, reducing the number of wirings from one per element to one per group. This consolidation significantly reduces the space required for wiring on the substrate, enabling higher piezoelectric element density while maintaining resolution through resonance frequency differentiation
Solution Approach 2:
Each piezoelectric element group is designed with distinct resonance frequencies that do not overlap. By changing the physical parameters (such as dimensions or material properties) of the vibrating portions, the patent enables individual identification and control of each group through frequency discrimination, maintaining resolution without requiring individual wirings
3Ease of manufacture
If piezoelectric elements are disposed at low density due to wiring requirements, then wiring space is sufficient, but resolution of the tactile sensor deteriorates
Solution Approach 1:
The patent assigns distinct resonance frequencies to each piezoelectric element group by modifying physical parameters such as the size, shape, or material composition of their vibrating portions. This frequency differentiation allows the system to resolve individual element responses without requiring dense wiring, enabling high element density while maintaining high resolution through frequency-based identification
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 allows for high-resolution load detection by analyzing changes in resonance frequencies, enabling precise load calculation without the need for extensive wiring, thus enhancing the sensitivity and accuracy of tactile sensors.
Implementation Method 1
a piezoelectric element group in which piezoelectric elements provided in the plurality of vibrating portions are coupled in parallel to each other
Implementation Method 2
load detectors individually including a vibrating portion and a piezoelectric element provided in the vibrating portion resonate at resonance frequencies different from each other, the resonance frequencies change in accordance with a load applied to the load detectors
Data Source
AI summary
A piezoelectric element device includes: a substrate including a plurality of vibrating portions having a first vibrating portion and a second vibrating portion; a piezoelectric element group in which a plurality of piezoelectric elements having a first piezoelectric element and a second piezoelectric element provided in the plurality of vibrating portions are coupled in parallel to each other; a plurality of load detectors having a first load detector including the first vibrating portion and the first piezoelectric element provided in the first vibrating portion and a second load detector including the second vibrating portion and the second piezoelectric element provided in the second vibrating portion; and a resin layer covering the piezoelectric element group. The first load detector resonates at a first resonance frequency, the second load detector resonates at a second resonance frequency, the first resonance frequency and the second resonance frequency are different from each other, the first resonance frequency changes in accordance with a load applied to the first load detectors via the resin layer, the second resonance frequency changes in accordance with a load applied to the second load detectors via the resin layer, and a first resonance frequency change range, which are changeable range of the first resonance frequency, and a second resonance frequency change range, which are changeable range of the second resonance frequency, do not overlap each other.