Active Stylus Tip Structure for Dust Sealing and Impact Cushioning
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Solution Overview
Problem
Current active styluses lack dust-proof and impact-proof components, leading to potential damage of internal electronic components due to axial impact forces and inadequate protection against dust ingress.
Innovation Solution
The active stylus incorporates a metal pin with an elastic ring to cover the gap between the tip and shaft, providing dust-proofing, and includes a sensing module with a metal sheet and micro control unit (MCU) connected via a flexible printed circuit (FPC) to generate and transmit touch control signals wirelessly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the gap between the tip and shaft is left open for structural simplicity, then the device complexity is reduced, but dust-proof protection is insufficient
Solution Approach 1:
The patent employs an elastic ring as a flexible sealing element that covers the gap between the tip and shaft. This elastic ring can deform elastically to maintain contact and sealing effectiveness, providing dust-proof protection without requiring a complex rigid sealing structure. The flexible nature of the elastic ring allows it to adapt to the gap geometry while maintaining a simple overall device design.
2Reliability
If the tip is strongly impacted by the impact surface to generate axial impact force, then the sensing function is activated, but the axial impact force is harmful to the electronic components in the shaft
Solution Approach 1:
The patent introduces an elastic ring positioned between the tip and the electronic components in the shaft. When axial impact force is generated during dropping or pressing, the elastic ring deforms elastically to absorb and cushion the impact force before it reaches the electronic components. This beforehand cushioning mechanism protects the electronic components from damage while still allowing the sensing module to detect the pressing action for normal operation.
Solution Approach 2:
The patent converts the harmful axial impact force into a beneficial sensing mechanism. The elastic deformation of the elastic ring under impact or pressing conditions generates a sensing signal that can be detected by the sensing module. This allows the same mechanical force that could potentially damage components to be utilized as the activation mechanism for the touch sensing function, turning a harmful effect into a useful feature.
3Reliability
If the elastic ring is added to cover the gap and provide dust-proofing, then the protection against dust and impact is enhanced, but the device complexity increases
Solution Approach 1:
The elastic ring in the patent serves multiple functions simultaneously: it provides dust-proof sealing by covering the gap between the tip and shaft, cushions axial impact forces to protect electronic components, and enables the sensing function through its elastic deformation. By consolidating these multiple functions into a single component, the patent enhances protection and functionality without proportionally increasing device complexity.
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 design enhances protection against impact and dust, reducing the risk of component damage while enabling reliable wireless transmission of touch control signals.
Implementation Method 1
an elastic ring is located between the tip and the opening
Implementation Method 2
the metal sheet is deformed in response to the axial movement of the pin holder and the metal pin. The sensor is located at a second side of the metal sheet and the sensor is configured to generate a sensing signal in response to sensed deformation of the metal sheet
Implementation Method 3
The FPC is bonded with the metal sheet by conductive adhesive and the MCU is configured to generate a touch control signal in response to the sensing signal
Implementation Method 4
The metal pin is configured to broadcast the touch control signal from the signal processing module with a wireless transmission protocol
Data Source
AI summary
An active stylus includes a tip, a metal pin, a metal shaft, a signal processing module and an elastic ring. A first end of the metal pin is wrapped in the tip. The metal shaft includes an accommodating cavity having an opening. The signal processing module is accommodated in the accommodating cavity. A second end of the metal pin goes through the elastic ring and the opening, and is coupled to the signal processing module. The metal pin is configured to broadcast a touch control signal from the signal processing module with a wireless transmission protocol.