Piezoelectric Sensor Conductive Paste Modulus Design
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Solution Overview
Problem
Existing force detecting devices in industrial robots face reliability issues due to disconnection of conductive elements under stress, particularly with thin internal electrodes and wire bonding connections, leading to connection failures and reduced productivity.
Innovation Solution
A sensor device configuration with piezoelectric bodies, internal electrodes, and conductive members where a second conductive member with lower modulus of elasticity absorbs stress, preventing rupture and ensuring reliable electrical connections, and a force detecting device with a package housing the piezoelectric bodies and conductive members to enhance reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wire bonding using copper wire or conductive paste is used to connect piezoelectric elements and housing, then electrical connection is achieved, but the connection is likely to be ruptured by vibration or external force causing connection failure
Solution Approach 1:
The patent changes the physical parameters of the conductive member by introducing a layered structure with different material properties. The first conductive member has high electrical conductivity for signal transmission, while the second conductive member has low modulus of elasticity (high elasticity) to absorb mechanical stress. This parameter differentiation resolves the contradiction between electrical connection reliability and mechanical strength.
Solution Approach 2:
The patent uses a composite structure consisting of two different conductive members with distinct material properties. The first conductive member (high conductivity) and second conductive member (high elasticity) work together as a composite system, where each material contributes its superior property to solve the overall problem of connection reliability under mechanical stress.
2Volume of moving object
If internal electrodes are made relatively thin, then device size is reduced, but electrical connection is insufficient and conductive paste may be ruptured by stress
Solution Approach 1:
The second conductive member acts as an intermediary between the thin internal electrodes and the external environment. It provides mechanical compliance and stress absorption, protecting the fragile electrical connection while allowing the internal electrodes to remain thin for miniaturization.
Solution Approach 2:
The patent changes the mechanical parameters of the connection path by introducing the elastic second conductive member. This allows the internal electrodes to maintain thin dimensions while the overall connection system gains mechanical robustness through the elastic component that absorbs stress.
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 solution effectively prevents conductive member rupture and ensures high reliability of the sensor and force detecting devices, enabling precise external force detection and improved operational safety in industrial robots.
Implementation Method 1
a plurality of piezoelectric bodies; an internal electrode formed between the plurality of piezoelectric bodies
Data Source
AI summary
A sensor device includes a charge output element including a plurality of piezoelectric bodies and an internal electrode formed between the piezoelectric bodies, a package that houses the charge output element, first conductive paste electrically connected to a plurality of the internal electrodes, and second conductive paste that electrically connects the first conductive paste and an output terminal and has a modulus of elasticity lower than a modulus of elasticity of the first conductive paste. A Young's modulus of the first conductive paste is equal to or higher than 3.4 GPa and equal to or lower than 5.0 GPa and a Young's modulus of the second conductive paste is equal to or higher than 0.1 GPa and equal to or lower than 0.2 GPa.