Conductive Sheet ESD Protection for Thin Touch Pad Terminals
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Solution Overview
Problem
In information terminals with reduced thickness, where a touch pad and pad bezel are arranged parallel to each other, static electricity can intrude into the printed circuit board through the gap between them, potentially causing failures, and applying conductive plating to both surfaces is costly.
Innovation Solution
A structure comprising a casing with a touch pad, an insulation sheet, and a conductive sheet member on the rear surface, where the conductive sheet is electrically connected to the body casing, effectively directing static electricity away from the printed circuit board by forming a conductive path that reduces the risk of electrostatic discharge-induced failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductive plating is applied to both surfaces of the touch pad and pad bezel to prevent static electricity intrusion, then reliability is improved, but manufacturing cost increases
Solution Approach 1:
The invention extracts the essential function of static electricity prevention from the complex and costly conductive plating process. By using a simple conductive sheet member (such as a metal foil or conductive adhesive tape) instead of applying conductive plating to both surfaces, the patent achieves the same electrostatic protection function with significantly reduced manufacturing complexity and cost.
Solution Approach 2:
The invention replaces expensive conductive plating with inexpensive conductive sheet members that can be easily applied and replaced. These sheet members (metal foils, conductive tapes, or adhesive sheets with conductive layers) are much cheaper than conductive plating processes and can be applied as simple overlays to achieve the same electrostatic discharge protection.
2Adaptability or versatility
If the terminal design is reduced in thickness, then adaptability is improved, but the risk of electrostatic discharge failures increases due to gaps between components
Solution Approach 1:
The invention introduces an intermediary conductive sheet member between the touch pad and pad bezel that serves as a mediator to redirect static electricity. This sheet member fills the functional gap created by the thin design, providing a continuous conductive path that prevents static electricity from intruding into the printed circuit board, thus maintaining reliability despite the reduced thickness.
Solution Approach 2:
The invention addresses the electrostatic protection problem in a different dimensional approach. Instead of trying to eliminate gaps through complex three-dimensional structural adjustments, the patent applies a two-dimensional conductive sheet overlay that spans across the gap area, creating a planar conductive barrier that effectively blocks static electricity paths without adding significant thickness.
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
This configuration prevents failures in the printed circuit board due to electrostatic discharge by providing an efficient discharge path for static electricity, reducing the risk of damage while maintaining the terminal's thin design without the high cost of conductive plating on all surfaces.
Implementation Method 1
the conductive sheet is electrically connected to the body casing, effectively directing static electricity away from the printed circuit board by forming a conductive path that reduces the risk of electrostatic discharge-induced failures
Data Source
AI summary
The present disclosure provides an information terminal which comprises: a casing having a main surface; a touch pad arranged on the main surface; an insulation sheet member arranged on a rear surface of the touch pad; and a conductive sheet member arranged on a rear surface of the insulation sheet member. The conductive sheet member may have a portion which extends toward the outside from an edge portion of the insulation sheet member.