Pointing Element Dynamic Pressing Force Control
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Solution Overview
Problem
Existing pointing elements fail to accurately detect contact with a display surface due to reliance on pressure switches, which can result in false readings and inadequate sensitivity, especially when the tip is not in contact with the surface.
Innovation Solution
A pointing element with a pressurizing part, pressure sensor, and signal generation section that adjusts the pressing force against the pressure sensor based on contact pressure, generating a second signal to control light emission and improve detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pressure sensor is pressed against by a predetermined member irrespective of contact state, then the sensitivity of contact detection is improved, but the reliability of detection output deteriorates due to false readings when not in contact
Solution Approach 1:
The pressing part dynamically adjusts the pressing force applied to the pressure sensor based on the contact state. When the tip contacts the display surface, the pressing force increases to enhance detection sensitivity. When not in contact, the pressing force decreases to prevent false readings, thus resolving the contradiction between sensitivity and reliability.
Solution Approach 2:
The system changes the pressing force parameter of the predetermined member based on the contact state detected by the pressure sensor. By adjusting this parameter dynamically, the system achieves high detection sensitivity during contact while maintaining reliability by reducing false signals during non-contact states.
2Device complexity
If a switch is used to detect contact state, then the device complexity is reduced, but the measurement precision of contact detection deteriorates
Solution Approach 1:
The patent replaces the mechanical switch with a pressure sensor that provides analog output proportional to the applied force. This substitution eliminates the binary ON/OFF limitation of switches, enabling continuous measurement of contact pressure and significantly improving detection precision while maintaining relatively simple device structure.
3Measurement precision
If the pressing force against the pressure sensor is increased to improve detection sensitivity, then the measurement precision improves, but false operations increase when the tip is not in contact
Solution Approach 1:
The pressing force is made dynamic rather than static. The system automatically adjusts the pressing force level based on whether contact is detected, thereby achieving high sensitivity during actual contact while suppressing false operations during non-contact states through reduced pressing force.
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
Enhances sensitivity and accuracy of contact detection, suppressing false operations and ensuring reliable light emission control, even when the tip is not in contact with the surface.
Implementation Method 1
a pressure sensor configured to detect a variation in the pressurizing part
Implementation Method 2
a signal generation section configured to receive a first signal having a level based on the pressing force from the pressure sensor, and generate a second signal by changing the level of the first signal
Data Source
AI summary
A pointing element configured to instruct an operation by being pressed against an operation surface includes a pressurizing part, a pressure sensor configured to detect a variation in the pressurizing part, an opposed part opposed to the pressure sensor, a pressing part configured to change a pressing force of pressing the opposed part against the pressure sensor in accordance with the variation in the pressurizing part caused by the pointing element pressed against the operation surface, a signal generation section configured to receive a first signal having a level based on the pressing force from the pressure sensor, and generate a second signal by changing the level of the first signal, and an output section configured to output information based on the second signal to outside of the pointing element.