Stylus Pen Positioning Module with Variable Capacitance Pressure Detection
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Solution Overview
Problem
Electrostatic stylus pens face challenges in accurately detecting pen pressure due to electrode displacement, affecting light touch input and making it difficult to replace worn pen cores.
Innovation Solution
A position indicating module with a dielectric, opposed electrodes, and a pen core with a detachable third electrode, using a conductive spring and flexible materials to maintain electrical connection without affecting pen pressure detection, allowing for accurate light touch detection and easy pen core replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a variable capacitance capacitor uses a dielectric with electrode displacement according to pen pressure, then pen pressure detection is enabled, but the connecting part affects detection accuracy and light touch input becomes difficult
Solution Approach 1:
The invention divides the electrode system into three separate electrodes (first electrode on dielectric surface, second electrode facing dielectric, third electrode in pen core tip). This segmentation allows the connecting parts to be separated from the pressure-sensitive detection area, enabling accurate light touch detection without connection interference.
Solution Approach 2:
The invention introduces a dielectric layer as an intermediary between the first and second electrodes. This dielectric mediator allows electrical connection while maintaining physical separation, preventing the connecting parts from directly interfering with the pressure detection mechanism and enabling accurate detection of light touches.
2Reliability
If the pen core with electrode is fixed in the stylus pen, then electrical connection is stable, but replacing a worn pen core becomes difficult
Solution Approach 1:
The invention segments the pen core from the main stylus body by providing a detachable connection interface. The pen core with the third electrode can be separately removed and replaced, maintaining stable electrical connection during use while enabling easy replacement when worn, thus resolving both reliability and ease of repair requirements.
3Ease of operation
If a connecting part is provided to connect the electrode in the displaced position, then electrical connection is achieved, but the connecting part interferes with pen pressure detection
Solution Approach 1:
The invention segments the electrical connection function from the pressure detection function by using three separate electrodes. The connecting parts are associated with electrodes 1 and 2 which are positioned to not interfere with the pressure-sensitive area, allowing both reliable electrical connection and accurate pressure detection to coexist.
Solution Approach 2:
The invention positions the connecting parts and electrodes in different spatial dimensions and orientations. The first electrode is on the dielectric surface, the second electrode faces the dielectric from the opposite side, and the third electrode is in the pen core tip. This dimensional arrangement ensures that connecting parts do not interfere with the pressure detection path between the second electrode and the dielectric.
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
Enables accurate detection of pen pressure applied by light touch and facilitates easy replacement of the pen core, improving the operational reliability and usability of electrostatic stylus pens.
Implementation Method 1
a variable capacitance capacitor that changes in capacitance according to the pen pressure
Implementation Method 2
a dielectric having two surfaces opposed to each other
Implementation Method 3
an electric connection between the core holder and the third terminal is made via a conductive spring
Data Source
AI summary
A position indicating device includes a variable capacitance capacitor, which has: a first electrode; a second electrode; and a dielectric separating the first electrode and the second electrode. A capacitance of the variable capacitance capacitor varies in response to application of pressure to the variable capacitance capacitor. The position indicating device also includes a core body having a tip including a third electrode, wherein, in operation, a signal is transmitted by the third electrode and pressure applied to the tip of the core body is transmitted to the variable capacitance capacitor, varying the capacitance of the variable capacitance capacitor. The position indicating device also includes a first terminal electrically connected to the first electrode; a second terminal electrically connected to the second electrode; a third terminal; and a core body holder configured to electrically connect the third electrode to the third terminal.