Conductive Plastic Stylus Tip Assembly for Accurate, Wear-Resistant Writing
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Solution Overview
Problem
Existing stylus tips suffer from inaccurate positioning and poor wear resistance due to the use of non-conductive plastic coating layers that either reduce signal strength or wear easily, affecting the writing experience and service life.
Innovation Solution
A tip assembly with a conductive plastic tip and a mounting housing, where the tip is softer than the housing, allowing direct charge conduction and increased thickness for improved wear resistance, and various connection methods enhance stability and assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the outer coating layer is made thick to improve wear resistance, then wear resistance is improved, but signal value decreases and positioning accuracy deteriorates
Solution Approach 1:
The patent uses conductive plastic as a composite material that combines both wear resistance and electrical conductivity in a single component. The conductive plastic tip integrates the functions of both the protective coating layer and the conductive electrode, eliminating the need for a thick non-conductive coating that would block signals. This composite material allows the tip to maintain high wear resistance while simultaneously ensuring strong signal transmission for accurate positioning.
Solution Approach 2:
The patent merges the functions of the outer coating layer and the inner conductive electrode into a single conductive plastic tip component. By combining these two previously separate components into one integrated element, the invention eliminates the signal blocking issue caused by thick non-conductive coatings while maintaining wear resistance, thus resolving the contradiction between protection and signal transmission.
2Measurement precision
If the outer coating layer is made thin to improve signal transmission, then positioning accuracy is improved, but wear resistance deteriorates
Solution Approach 1:
The conductive plastic tip serves as a composite material that simultaneously provides both signal conductivity and wear resistance. This eliminates the need to choose between a thin non-conductive coating (which would wear easily) and a thick coating (which would block signals). The composite material enables both functions to coexist in a single component.
Solution Approach 2:
The patent creates an asymmetric hardness relationship where the conductive plastic tip is softer than the mounting housing. This asymmetric material selection allows the tip to be replaceable and optimized for writing performance while the harder housing provides structural support and durability, resolving the wear resistance concern while maintaining signal transmission capability.
3Ease of operation
If the tip is made softer to improve writing performance, then writing smoothness is improved, but structural strength deteriorates
Solution Approach 1:
The patent segments the tip assembly into two distinct parts with different hardness levels: the conductive plastic tip (softer, Shore hardness 60A-90A) for writing performance, and the mounting housing (harder) for structural strength. This segmentation allows each component to be optimized for its specific function - the softer tip provides smooth writing while the harder housing maintains structural integrity.
Solution Approach 2:
The invention employs asymmetric hardness design where the tip material is deliberately made softer than the housing material. This asymmetric relationship enables the tip to conform to the touchscreen for smooth writing operation while the harder housing provides the necessary structural support and durability, resolving the contradiction between writing performance and structural strength.
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 enables high positioning accuracy and extended wear resistance by maintaining signal strength and reducing detachment, resulting in a better writing experience and longer service life.
Implementation Method 1
The tip is prepared and formed by using conductive plastic, and has a conductive property. During writing, a writing surface is directly in contact with the touchscreen, charges can be directly conducted to the touchscreen, and no signal value loss occurs.
Data Source
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AI summary
This application provides a tip assembly and a preparation method therefor, a composite material, and a stylus. The tip assembly includes a mounting housing and a tip. The mounting housing is an insulated housing and is provided with a first end surface and a first mounting hole. The first mounting hole penetrates through the housing from the first end surface. The tip is made of conductive plastic. The tip includes a writing surface and a second end surface that are disposed opposite to each other. The writing surface is a convex arc surface used for writing. The second end surface is disposed facing the first end surface and is connected to the first end surface. The tip blocks the first mounting hole, and hardness of the tip is less than hardness of the mounting housing. The tip assembly can increase a signal value of coupling between the tip and a touchscreen, to improve positioning accuracy in a writing process, and improve wear resistance of the tip.