Active Capacitive Stylus Gap-Free Assembly for Precision
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Solution Overview
Problem
Capacitive touch control devices face challenges with lower precision in positional detection, hindering smooth operations, especially in handheld devices, where more precise and efficient detection is required.
Innovation Solution
An active capacitive stylus with a pen-shaped casing structure, support structure, circuit substrate, sensor module, elastic assembly, abutting assembly, and power supply component, where the elastic assembly includes a flexible holder and element contacting the sensor module, and the pen head, abutting, and sensor module are abutted without gaps, enhancing precision and smoothness of writing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional capacitive touch control device is used, then the device has simple construction and lower cost, but the positional detection precision is lower
Solution Approach 1:
An active capacitive stylus is introduced as an intermediary tool between the user and the capacitive touch screen. The stylus contains a conductive tip that generates a controlled capacitive signal, acting as a mediator to enhance detection precision without requiring changes to the touch screen itself. This allows precise positional detection while maintaining the simplicity of the capacitive touch control device.
Solution Approach 2:
The system is segmented into two independent parts: the capacitive touch control device and the active capacitive stylus. The stylus contains all the complex components (conductive tip, power source, control circuitry) separately, allowing the touch screen to remain simple while achieving high precision through the specialized stylus tip.
2Reliability
If a rigid pen tip is used on resistive touch control device, then the touch input can be detected, but significant force is required and the service life is reduced
Solution Approach 1:
The mechanical pressure-based resistive touch system is replaced with a capacitive coupling system. Instead of requiring mechanical force to deform layers, the active capacitive stylus uses electrical capacitance coupling between its conductive tip and the touch screen, eliminating the need for significant applied force and reducing mechanical wear.
Solution Approach 2:
The input mechanism changes from mechanical deformation (resistive) to electrical capacitance variation. The conductive tip of the stylus creates a controlled capacitive coupling with the touch screen, changing the detection parameter from mechanical pressure to electrical capacitance, which requires minimal force and extends service life.
3Measurement precision
If the components in the active capacitive stylus have gaps between them, then the assembly is easier to manufacture, but the writing precision and smoothness are reduced
Solution Approach 1:
The stylus incorporates flexible holding structures and elastic assemblies that can accommodate minor dimensional variations and assembly tolerances. These flexible components maintain consistent electrical and mechanical connections between the conductive tip, circuit board, and other internal components, ensuring writing precision while allowing for easier assembly compared to rigid precision-fitted components.
Solution Approach 2:
The design includes elastic assemblies and flexible holders that provide built-in compliance and tolerance compensation. These elements are designed beforehand to absorb assembly variations and maintain optimal component spacing, ensuring consistent writing performance without requiring extremely tight manufacturing tolerances.
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 active capacitive stylus provides enhanced precision and a smooth writing experience by eliminating gaps between components, allowing for precise positional detection and pressure-sensitive input on capacitive touch panels.
Implementation Method 1
The elastic assembly includes a flexible holder contacting the sensor module and a flexible element disposed between the flexible holder and the sensor module
Implementation Method 2
a capacitive touch control device relies on capacitive coupling, which takes place as soon as the capacitive touch sensor is touched by a conductive object so that the touch position can then be identified according to the variation in capacitance at the touch point
Data Source
AI summary
The present disclosure provides a portable electronic device and an active capacitive stylus thereof. The active capacitive stylus includes a pen-shaped casing structure, a support structure, a circuit substrate, a sensor module, an elastic assembly, an abutting assembly, a pen head structure and a power supply component. The circuit substrate is positioned on the support structure. The sensor module is electrically connected to the circuit substrate. The elastic assembly includes a flexible holder contacting the sensor module and a flexible element disposed between the flexible holder and the sensor module. The abutting assembly is disposed inside the pen-shaped casing structure to abut against the flexible holder. The pen head structure, the abutting assembly, the elastic assembly and the sensor module are abutted one to another, so that there is no gap between two of the pen head structure, the abutting assembly, the elastic assembly and the sensor module.