Input Device Protection Member for Force Distribution
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Solution Overview
Problem
Existing input devices with pressure sensing elements face performance deterioration due to local application of pressing force, leading to plastic deformation and electrical characteristic degradation.
Innovation Solution
Incorporating a protection member with higher strength than the elastic body between the elastic body and the pressing member, which disperses the pressing force and reduces the likelihood of excessive force application, thereby minimizing plastic deformation and electrical deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the contact area between the conductive structure member and the elastic electrode part increases to detect pressing force, then the resistance value changes allowing force detection, but the conductive structure member locally applies pressing force causing plastic deformation and electrical characteristic deterioration
Solution Approach 1:
The patent introduces a protection member as an intermediary component positioned between the pressing member and the elastic body. This protection member has a larger contact area than the pressing member, allowing it to receive and distribute the pressing force over a wider area. By doing so, it prevents the pressing member from directly concentrating force on a small area of the elastic body, thereby avoiding local plastic deformation and electrical characteristic deterioration while still enabling pressing force detection through the elastic body's overall deformation.
2Measurement precision
If the conductive structure member directly contacts the elastic electrode part for force sensing, then the resistance value provides detection signal, but the elastic body undergoes plastic deformation reducing device reliability
Solution Approach 1:
The protection member serves as a mediator that receives the pressing force from the pressing member and distributes it to a larger area of the elastic body. This prevents the pressing member from directly contacting and concentrating force on the elastic body's surface, thereby preventing plastic deformation and maintaining the elastic body's structural integrity and electrical characteristics while still enabling force detection through controlled elastic deformation.
3Speed
If the pressing member applies force directly to the elastic body for detection, then the response is immediate, but the localized stress causes deterioration of electrical characteristics
Solution Approach 1:
The protection member acts as an intermediary that distributes the pressing force over a larger area of the elastic body, preventing localized stress concentration that would damage electrical characteristics. The elastic body still deforms in response to the distributed force, maintaining detection response speed, while the protection member prevents the pressing member from directly concentrating stress on specific points, thereby preserving electrical characteristic stability.
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 reduces performance degradation by dispersing the pressing force and improving the linearity of electrostatic capacitance changes, enhancing the input device's reliability and sensitivity.
Implementation Method 1
an elastic body 20a, 20b, 20d, 20e, 20g, or 20h on the electrode 11a, 11b, 11d, 11e, 11g, or 11h
Implementation Method 2
the protection member 71a, 71b, 71c, or 71d disperses the pressing force and reduces the likelihood of excessive force application
Data Source
AI summary
An input device includes one or more pressure detectors. Each of the one or more pressure detectors includes an electrode, an elastic body on the electrode, a pressing member disposed on an opposite side of the elastic body from the electrode, and a protective member. The protection member is disposed between the elastic body and the pressing member and has higher strength than the elastic body.