Piezoresistive Button Structure for Precise Force Transmission
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Solution Overview
Problem
Piezoresistive sensors in button structures of handheld input devices often suffer from inaccurate positioning and fixing, leading to insensitivity and a reduced user experience due to inefficient force transmission.
Innovation Solution
A button structure comprising a base with a slot, a sensing element inserted into the slot, a pressure concentration element fixedly connected to the sensing element, and a key cap with a core member that transmits applied pressure to the sensing element through the pressure concentration element, ensuring accurate force transmission and improved sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If piezoresistive sensors are installed into existing buttons, then the functionality is improved, but the positioning and fixing accuracy deteriorates
Solution Approach 1:
A dedicated sensor housing is introduced as an intermediary component between the button and the piezoresistive sensor. This housing provides precise positioning features including a recessed portion that receives and secures the sensor at a predetermined position, eliminating positioning inaccuracies while maintaining enhanced button functionality
2Adaptability or versatility
If piezoresistive sensors are installed into existing buttons, then the functionality is improved, but the force transmission accuracy deteriorates
Solution Approach 1:
The sensor housing incorporates a pressure concentration element with a specific geometric shape that concentrates applied force onto a focused area of the piezoresistive sensor. This local quality enhancement ensures accurate force transmission to the sensor while maintaining the overall button functionality
3Manufacturing precision
If a slot is provided in the base for sensor insertion, then the sensor positioning is improved, but the device complexity increases
Solution Approach 1:
The sensor housing combines multiple functions into a single integrated component: it provides the slot for sensor insertion, includes the recessed portion for securing the sensor, and incorporates the pressure concentration element. This merging reduces overall structural complexity while maintaining precise sensor positioning
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 enhances the sensitivity and precision of the button structure, providing a more responsive gaming experience by accurately transmitting pressure changes to the piezoresistive sensor, allowing for varied user inputs and corresponding game actions.
Implementation Method 1
A piezoresistive sensor can be utilized to improve the functionality of buttons to enhance user experience by taking advantage of the properties of a change in resistance in response to an applied pressure
Data Source
AI summary
A button structure has a base having a slot and a sensing element inserted into the slot. A pressure concentration element is fixedly connected by bonding to the sensing element and a key cap is mounted to the base. The key cap has a core member fixedly connected to a lower surface of a top plate of the key cap. The lower surface of the core member can be brought into contact with the pressure concentration element on application of a pressure to an upper surface of the top plate, such that the applied pressure is transmitted to the sensing element through the core member and the pressure concentration part. The sensing element is a piezoresistive film sensor.