Position Indicator Polarity-Based Pressure Detection
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Solution Overview
Problem
Existing position indicators with pressure detecting capabilities face challenges in accurately detecting pressure at the tip portion when it first contacts the input surface, requiring a minimum offset load to avoid false detection and ensuring valid writing input, which delays the recognition of writing input and affects usability.
Innovation Solution
A position indicator with a pressure detector that outputs pressure information with polarity, allowing detection of pressure even below the offset load, enabling immediate recognition of writing input and improving usability by transmitting pressure information corresponding to the detected pressure, regardless of the load magnitude.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a minimum offset load is set for pressure detection, then false detection is avoided, but writing input recognition is delayed
Solution Approach 1:
The patent changes the detection parameter from binary threshold-based detection to continuous polarity-based detection. By detecting the polarity of the reaction force rather than simply thresholding at a fixed offset load, the system can recognize writing input immediately upon contact while maintaining accurate pressure detection. The polarity information allows the system to distinguish between light contact and proper pressing without requiring a minimum load threshold.
2Speed
If the tip portion lightly touches the input surface, then immediate contact is achieved, but pressure detection becomes unreliable
Solution Approach 1:
The patent introduces feedback through polarity detection of the reaction force. By continuously monitoring the polarity of the force detected by the pressure detector, the system provides immediate feedback that writing input has been detected, even when the applied pressure is small. This feedback mechanism allows the system to confirm writing intent based on the directional information from the pressure detector rather than requiring a minimum pressure threshold.
3Stability of the object's composition
If a predetermined offset load is required for detection, then stable pressure detection is achieved, but usability is reduced
Solution Approach 1:
The patent transitions from a static threshold-based detection system to a dynamic polarity-based detection system. The system continuously monitors the polarity of the reaction force and can adapt to different pressing conditions. This dynamic approach allows the system to maintain stable detection across various pressure levels while improving usability by recognizing writing input immediately upon contact, without requiring the user to apply a minimum offset load.
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
This solution allows for immediate validation of writing input and enhances the usability of the position indicator by accurately detecting pressure variations, mimicking the experience of writing with traditional stationery, even when the tip is lightly pressed or at an angle.
Implementation Method 1
a pressure detector that detects a pressure applied to a tip portion of a core body (17) as an electrical displacement amount corresponding to the pressure
Data Source
AI summary
A position indicator includes: a pressure detector that detects a pressure applied to a tip portion as an electrical displacement amount corresponding to a magnitude of the pressure; a pressure output circuit that outputs pressure information indicating a first polarity or a second polarity, the pressure information indicating the first polarity if the electrical displacement amount detected by the pressure detector is greater than or equal to a predetermined value, the pressure information indicating the second polarity if the electrical displacement amount detected by the pressure detector is less than the predetermined value, the predetermined value being larger than a value of the electrical displacement amount detected by the pressure detector when no pressure is applied to the tip portion of the core body; and a transmitting circuit that transmits the pressure information indicating the first polarity or the second polarity output circuit to a position detecting device.