Capacitive Pointer With Pressure Sensing For Precise Writing
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Solution Overview
Problem
Capacitive touch panels are inadequate for delicate writing input operations and lack multifunctionality when using a user's hand for input, as gestures are not suitable for precise stroke thickness changes and lack various functions.
Innovation Solution
A capacitive pointer apparatus comprising a conductive refill, refill column, elastomer, pressure sensor, sensor board, control circuit board, and power source, which detects tip pressure and generates capacitive detection signals to enable precise and multifunctional writing input on a touch panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If user's hand is used for capacitive touch input, then multi-touch function is achieved, but delicate writing input operation and stroke thickness control are inadequate
Solution Approach 1:
A capacitive pointer serves as an intermediary tool between the user and the touch panel. The pointer includes a conductive refill that generates capacitive detection signals to interact with the touch panel, while pressure sensors detect tip pressure to enable precise writing operations and stroke thickness control, resolving the contradiction between multi-touch capability and writing precision
Solution Approach 2:
The capacitive pointer integrates multiple functions into a single device: it provides capacitive touch input for general interaction, pressure sensing for delicate writing operations, and coordinate detection for precise positioning. This multi-functional design allows the same device to handle both multi-touch scenarios and precise writing tasks
2Ease of operation
If user's hand is used for input operation, then simple operation is achieved, but multifunctionality and delicate writing input are lacking
Solution Approach 1:
The capacitive pointer integrates multiple functions into a single device: capacitive touch sensing for general interaction, pressure sensing for delicate writing operations, and coordinate detection for precise positioning. This multi-functional design allows the same device to handle both simple and complex input tasks
3Measurement precision
If pressure sensor and sensor board are added to detect tip pressure, then writing precision is improved, but device complexity increases
Solution Approach 1:
The pressure sensor is mounted on the sensor board, which is integrated within the pointer structure. The elastomer is positioned between the refill column and pressure sensor, creating a nested arrangement where components are efficiently organized within limited space, minimizing overall device complexity while maintaining precision detection capability
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 exquisite and multifunctional writing input operations on touch panels by accurately detecting tip pressure and coordinates, enhancing user interaction with capacitive touch input technology.
Implementation Method 1
a tip pressure applied upon the capacitive pointer apparatus is detected by the pressure sensor through pressing the conductive refill, the refill column and the elastomer against the pressure sensor
Implementation Method 2
The pointer tip generates capacitive detection signals with a touch panel to detect coordinates of the capacitive pointer apparatus
Data Source
AI summary
A capacitive pointer is disclosed. The capacitive pointer comprises a conductive refill, a refill cover, an elastomer, a pressure sensor, a sensor board, a control circuit board, a pointer tip, a first frame and a second frame. The conductive refill penetrates and combines with the refill cover. The pressure sensor is mounted on the sensor board. The conductive refill applies a tip pressure against on the pressure sensor through the refill cover pushing the elastomer to sense the tip pressure of the capacitive pointer. The sensor board electrically connects the control circuit board to calculate a tip pressure value of the capacitive pointer. The pointer tip electrically connects the control circuit board. The first frame and the second frame are located between the conductive refill and the refill cover and combine to secure the control circuit board.