Piezo Force Sensor SSB Spacer Signal Delay
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing force sensors with pressure-sensitive adhesive (PSA) spacers suffer from actuation signal stabilization delays due to deformation of the viscoelastic PSA, which also causes restoration signal delays, and exhibit residue issues during peeling tests.
Innovation Solution
A solid-state bonding (SSB) spacer is introduced between the top and bottom stacks of the force sensor, maintaining a fixed position and preventing deformation, thereby reducing signal delays and ensuring clean separation without residues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a PSA spacer is used to maintain fixed space between top and bottom stacks, then the structural stability is improved, but the response speed deteriorates due to viscoelastic deformation
Solution Approach 1:
The patent changes the material parameter of the spacer from viscoelastic PSA to solid-state bonding material, fundamentally altering its mechanical properties to eliminate time-dependent deformation while maintaining structural stability
Solution Approach 2:
The patent replaces the mechanical deformation mechanism of PSA with a solid-state bonding mechanism that does not rely on viscoelastic flow, substituting a faster mechanical response system
2Shape
If a PSA spacer is used to maintain fixed space, then the spacing function is improved, but the signal stabilization time deteriorates
Solution Approach 1:
The patent changes the temporal response parameter of the spacer material from slow viscoelastic recovery to immediate solid-state response, reducing signal stabilization time while maintaining the spacing function
3Strength
If a PSA spacer is used between stacks, then the bonding function is improved, but the cleanliness during separation deteriorates due to residue
Solution Approach 1:
The patent changes the material state parameter from sticky PSA to solid-state bonding material, fundamentally altering the separation behavior to eliminate residues while maintaining bonding strength
Solution Approach 2:
The patent converts the potentially harmful sticky residue characteristic of PSA into a beneficial clean separation characteristic by using solid-state bonding material that does not leave residues
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 SSB spacer enables rapid response to applied forces with minimal signal delay, achieving stabilization within 0.1 seconds and ensuring clean separation without sticky residues, significantly improving the accuracy and reliability of force measurements.
Implementation Method 1
A solid-state bonding (SSB) spacer is introduced between the top and bottom stacks of the force sensor, maintaining a fixed position and preventing deformation
Implementation Method 2
a piezo material 13 configured on a bottom side of the bottom electrode 12B
Data Source
AI summary
A fast response force sensor is disclosed. The fast response force sensor comprises a solid-state bonding (SSB) spacer and piezo material therein. The SSB spacer is sandwiched between a top stack and a bottom stack of the force sensor. The SSB spacer maintains a fixed relative position between a top stack and a bottom stack of the force sensor when a fixed force is applied or removed. The SSB spacer is in solid state and shall not be significantly deformed while being depressed by a user, and therefore the response time of an output signal is vastly determined by the properties of the piezo material of the force sensor when a force is applied against the force sensor. Therefore, a fast response force sensor can respond quickly to a force applied against it.