Miniaturized Rechargeable Capacitive Stylus with Pressure Sensor
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Solution Overview
Problem
Capacitive touch control devices face challenges with lower precision in position detection, hindering smooth operation in applications requiring more precise and efficient detection, such as in handheld devices, where conventional solutions like using pens for capacitive touch input are often preferred.
Innovation Solution
A miniaturization rechargeable capacitive stylus is designed with a pen-shaped metal casing, support structure, circuit substrate, sensor module, pen head structure, electrical connector, and power supply component, featuring a movable pen head for precise pressure detection and an LED indicator, allowing for enhanced precision and convenience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a capacitive touch control device uses a conductor (finger or pen) to touch the surface for position detection, then the device can be operated, but the position detection precision is lower
Solution Approach 1:
The patent replaces the conventional capacitive touch detection method (which relies on capacitive coupling from a conductive object) with a mechanical pressure detection system. A pressure-sensitive sensor is integrated into the pen tip, directly measuring the pressure applied by the user. This mechanical-to-electrical conversion enables precise position and pressure detection without relying on capacitive coupling, thereby resolving the contradiction between detection precision and operation smoothness.
2Measurement precision
If an electromagnetic touch control device uses a battery-powered pen for input, then precise input is achieved, but the device complexity and power consumption increase
Solution Approach 1:
The patent replaces the complex electromagnetic pen system (which requires batteries, electromagnetic coils, and power management circuits) with a simple mechanical pressure-sensitive sensor system. The pen contains only essential components: a pressure-sensitive sensor, a flexible printed circuit board, and a protective cover. This mechanical substitution eliminates the need for power-consuming electromagnetic components while maintaining input precision, thereby reducing device complexity and power consumption.
3Ease of operation
If a resistive touch control device applies significant force on a very small area to accomplish deformation, then touch input is achieved, but the service life is reduced
Solution Approach 1:
The patent replaces the resistive touch mechanism (which requires deforming a resistive layer through significant force application) with a capacitive touch detection system integrated into the pen tip. The pressure-sensitive sensor detects pressure through capacitive coupling without requiring physical deformation of any layer. This substitution maintains ease of operation while eliminating the wear and tear associated with resistive layer deformation, thereby significantly extending the service life of the touch device.
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 miniaturization rechargeable capacitive stylus provides improved precision in position detection and efficient operation by integrating a sensor module and power supply within a compact, rechargeable design, enhancing user experience in capacitive touch applications.
Implementation Method 1
the working principle of 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
Data Source
AI summary
A portable electronic device uses a miniaturization rechargeable capacitive stylus including a pen-shaped metal casing structure, a support structure, a circuit substrate, a sensor module, a pen head structure, an electrical connector structure, and a power supply component. The pen-shaped metal casing structure has a retaining convex portion. The electrical connector structure includes a carrier substrate positioned on the support structure and an electrical connector disposed on the carrier substrate, and the electrical connector has an electrical connection portion exposed from the pen-shaped metal casing structure. When the pen-shaped metal casing structure is inserted into a receiving space of the portable electronic device, the pen-shaped metal casing structure is positioned inside the receiving space of the portable electronic device by matching the retaining convex portion of the pen-shaped metal casing structure and a retaining concave portion that is disposed inside the receiving space of the portable electronic device.