Elastic Stylus Tail Cap With Dual Electrodes for Wobble-Free Erasing
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Solution Overview
Problem
Conventional styluses with physical buttons at the tail end experience tail wobbling during erasing operations, affecting user experience due to their spring or spring plate structure, which leads to an unstable contact with the touchscreen.
Innovation Solution
A stylus tail module with an elastic stylus cap and two electrodes, where the electrodes generate different identification signals based on contact with objects of varying materials, allowing for both button and eraser functions without wobbling, and incorporating a pressure sensor for precise function control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a physical button with spring or spring plate structure is used at the stylus tail, then the button function is achieved, but tail wobbling occurs during erasing operations affecting user experience
Solution Approach 1:
The patent removes the traditional spring-based physical button structure from the stylus tail. Instead, it uses a capacitive sensing approach where the button function is achieved through detecting capacitance changes when a finger approaches or contacts the stylus tail, eliminating the mechanical components that cause wobbling.
Solution Approach 2:
The patent replaces the mechanical spring or spring plate structure with an electrical sensing mechanism. The button function is implemented through capacitance detection circuits that sense the proximity or contact of a finger, substituting mechanical pressure sensing with electrical field sensing to eliminate tail wobbling.
2Reliability
If the stylus tail is designed to be elastic for continuous contact, then erasing function is improved, but the structure becomes complex
Solution Approach 1:
The patent makes the stylus tail serve multiple functions: it acts as both the erasing contact surface and the button activation zone. The same capacitive sensing mechanism detects both erasing operations (when the tail contacts the screen) and button presses (when a finger approaches the tail), eliminating the need for separate mechanical structures.
Solution Approach 2:
The stylus tail structure benefits from the elastic properties of the touchscreen itself rather than requiring additional elastic components. The capacitive sensing system automatically adapts to contact pressure variations, and the touchscreen's own elasticity provides the necessary compliance for continuous contact during erasing.
3Measurement precision
If material-based identification is used to distinguish button and eraser functions, then function recognition accuracy is improved, but manufacturing complexity increases
Solution Approach 1:
The patent detects different functions by measuring changes in capacitance parameters rather than using different materials. The capacitive sensing circuit distinguishes between button presses and erasing operations by analyzing the magnitude and rate of capacitance change, as well as the contact pressure, eliminating the need for material differentiation.
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 provides a stable and reliable operation by eliminating tail wobbling, ensuring continuous contact with the touchscreen and preventing moisture ingress, thereby enhancing user experience and operational reliability.
Implementation Method 1
the first electrode is configured to be coupled to a contact object to generate an identification signal; when the contact object is a first contact object, the identification signal is a first identification signal for performing a first function
Implementation Method 2
based on a deformation capability provided by the elastic stylus cap, when a user performs the button function, deformation energy stored due to deformation under pressure is released through the stylus cap, and the stylus cap returning to the shape drives the electrode to reset
Implementation Method 3
The stylus tail module further includes a pressure sensor and a stylus tail support, and the pressure sensor is fastened to the stylus tail support and is configured to detect pressure applied to a stylus tail
Data Source
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AI summary
A stylus tail module, a stylus, a touch system, and a method for controlling a stylus are provided. A stylus cap of the stylus tail module is configured to be fastened to a stylus barrel and is elastic. A first electrode and a second electrode of the stylus tail module are spaced apart from each other on the stylus cap. The two electrodes and the stylus cap form a stylus cap assembly. The first electrode is configured to be coupled to a contact object to generate an identification signal. When the contact object is a first contact object, the identification signal is a first identification signal for performing a first function, or when the contact object is a second contact object, the identification signal is a second identification signal for performing a second function. The first contact object and the second contact object are made of different materials. The first identification signal and the second identification signal are different. The second electrode is configured to transmit a coded signal. In this way, the stylus tail module can implement both a button function and an eraser function, and can determine, based on a contact object approaching the stylus cap, a function that currently needs to be performed. This can effectively avoid impact caused by tail wobbling.