Pressure-Activated Membrane Switches for Rigid Object Sensing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional membrane switches are less effective in detecting pressure from rigid objects due to the direct load application, which prevents the membrane layers from bending and contacting each other, reducing their functionality in such scenarios.
Innovation Solution
A pressure-activated membrane switch is designed with an electrically-conductive membrane and a compliant conductive material, featuring spacers that form gaps allowing the conductive material to deform and contact the membrane upon pressure application, effectively closing the electrical circuit regardless of the object's compliance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional membrane switches use rigid columns for pressure detection, then they work well with compliant objects like human fingers, but they fail to detect pressure from rigid objects
Solution Approach 1:
The patent changes the physical state and mechanical properties of the columns from rigid to compliant by using foam material. This parameter change allows the columns to deform under pressure from both compliant objects (fingers) and rigid objects, enabling reliable detection across different object types. The compliant columns can be compressed by rigid objects directly, while still maintaining the bending-around capability for compliant objects.
Solution Approach 2:
The patent uses foam material that combines the compliance needed for detecting rigid object pressure with the ability to bend around for compliant object detection. This composite approach creates columns that exhibit both rigid and compliant characteristics, allowing the switch to function reliably with various types of pressing objects.
2Force
If rigid objects apply direct load to columns, then the loading is more efficient, but the membrane layer cannot bend around columns to contact the other layer
Solution Approach 1:
The patent changes the mechanical parameter of the columns from rigid to compliant, allowing them to deform under direct load from rigid objects. This deformation enables the membrane layer to bend around the columns and establish contact with the other layer, even when subjected to direct pressure from rigid objects rather than compliant fingers.
3Ease of operation
If membrane layers are designed to bend around rigid columns, then they work for compliant objects, but the switch becomes less likely to detect rigid object pressure
Solution Approach 1:
The patent changes the column material from rigid to compliant foam, which maintains the ability of membrane layers to bend around the columns for compliant object detection, while simultaneously enabling direct compression detection for rigid objects. The compliant columns deform in response to both bending forces and direct compressive forces.
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
Enables reliable detection of pressure from both compliant and rigid objects by ensuring the conductive materials can contact each other, enhancing the switch's functionality and usability in various applications.
Implementation Method 1
the compliant conductive material is configured to deform between the one or more gaps to contact the electrically-conductive membrane
Data Source
AI summary
A pressure-activated membrane switch and methods of use are provided. The pressure-activated membrane switch includes an electrically-conductive membrane, and a compliant conductive material having an electrically-conductive inner surface, wherein contact between the electrically-conductive membrane and the electrically-conductive inner surface of the compliant material is configured to cause an electrical circuit, of which the switch is a part, to close. The pressure-activated membrane switch further includes a plurality of spacers dispersed between the electrically-conductive membrane and the compliant conductive material. The plurality of spacers form one or more gaps between the electrically-conductive membrane and the compliant conductive material, and, with an application of pressure against the compliant conductive material, the compliant conductive material is configured to deform between the one or more gaps to contact the electrically-conductive membrane.