Keyboard Capacitive Touch Sheet Under Non-Conductive Board
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Solution Overview
Problem
The conventional design of integrating a capacitive touch sensing sheet under the keycap in keyboards makes the assembly process time-consuming and can affect touch sensitivity due to assembly holes, increasing manufacturing costs.
Innovation Solution
The capacitive touch sensing sheet is disposed under a non-conductive board, eliminating the need for assembly holes and preventing metal shielding effects, thus simplifying the assembly process and enhancing touch sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the capacitive touch sensing sheet is disposed under the keycap with assembly holes, then the keyswitch input function and touch sensing function can be integrated, but the assembly process becomes time-consuming and the touch sensitivity is affected
Solution Approach 1:
The capacitive touch sensing sheet is relocated from the traditional position under the keycap to a new position under the non-conductive board, changing the spatial dimension of placement. This dimensional change eliminates the need for assembly holes in the sensing sheet while maintaining both keyswitch input and touch sensing functions, thereby reducing assembly time and improving touch sensitivity
2Ease of manufacture
If assembly holes are formed on the capacitive touch sensing sheet, then the sheet can be disposed under the keycap, but the touch sensitivity is degraded
Solution Approach 1:
The design extracts the capacitive touch sensing sheet from the keycap assembly area and relocates it to the non-conductive board area. This extraction eliminates the need for assembly holes in the sensing sheet, preserving its touch sensitivity while still enabling integration with the keyswitch structure through the support device connection
3Adaptability or versatility
If the capacitive touch sensing sheet is disposed under the keycap, then both functions can be integrated, but metal shielding effect occurs
Solution Approach 1:
The non-conductive board serves as an intermediary layer between the capacitive touch sensing sheet and the metal keyswitch components. By placing the sensing sheet under the non-conductive board rather than directly under the keycap, the non-conductive material acts as a shielding mediator that blocks metal shielding effects from reaching the sensing sheet, while still allowing both functions to be integrated
Data Source
AI summary
A keyboard includes a non-conductive board, a plurality of keyswitches, and a capacitive touch sensing sheet. The plurality of keyswitches is disposed on the non-conductive board. Each keyswitch includes a keycap and a support device. The support device is connected to the keycap and the non-conductive board so as to make the keycap movable between a pressing position and a non-pressing position relative to the non-conductive board. The capacitive touch sensing sheet is disposed under the non-conductive board for providing a cursor signal to a computer device.