Force-Sensing Stylus Using Electromagnetic Coils for Line Width Control
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Solution Overview
Problem
Current stylus technologies lack an intuitive method for selecting line properties such as line thickness or other parameters in graphical user interfaces, particularly in electronic drawing applications, where continuous variation of line width is difficult to achieve through interaction with a graphical user interface.
Innovation Solution
A force-sensitive stylus with a first electromagnetic coil fixed within a housing and a second electromagnetic coil attached to a tip element, which varies in position based on applied force, uses a control circuit to encode and transmit the force as a radio frequency signal to a host electronic device, allowing for real-time adjustment of line properties based on pressure variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a stylus interacts with a graphical user interface to select line properties, then user input capability is enabled, but the method is not intuitive and continuous variation of line width is difficult to achieve
Solution Approach 1:
The patent replaces the mechanical interaction of touching screen regions with a graphical interface with a force-based mechanical sensing system. The electromagnetic coil and compliant element detect applied force directly, allowing continuous line width variation through pressure control rather than navigating graphical menus, thus improving intuitiveness while maintaining simple operation
Solution Approach 2:
The patent changes the operational parameter from discrete screen region selection to continuous force magnitude detection. The electromagnetic coil senses varying degrees of applied force, enabling continuous variation of line width properties rather than selecting from predefined options, thereby achieving more intuitive and flexible control
2Measurement precision
If a force-sensitive stylus uses electromagnetic coils to detect applied force, then measurement precision of pressure is improved, but device complexity increases
Solution Approach 1:
The electromagnetic coil serves multiple functions: it acts as both the force sensing element and the wireless communication transmitter. By integrating these functions into a single component, the patent achieves precise force detection without proportionally increasing device complexity, as the same coil structure enables both measurement and data transmission
Solution Approach 2:
The patent nests the electromagnetic coil within the housing structure, integrating the sensing mechanism into the existing stylus body. The compliant element and coil are arranged in a compact nested configuration, allowing precise force detection while minimizing the overall device complexity and maintaining a sleek stylus design
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 intuitive and continuous adjustment of line properties, simulating physical drawing tools by accurately detecting and communicating applied pressure, enhancing user interaction and simulating the experience of using physical drawing tools in electronic environments.
Implementation Method 1
a coil and iron powder core
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
The present disclosure provides a force-sensitive stylus having a first electromagnetic coil located at a fixed position within a housing and a second electromagnetic coil that is attached to a moveable tip element and positioned to interact with the first electromagnetic coil, such that the position of the second electromagnetic coil relative to the first electromagnetic coil is dependent upon the force applied to the tip element. A control circuit energizes a transmitting coil of the first and second electromagnetic coils with a radio frequency signal and senses the current induced in the other coil to determine the force on the tip element. The force may be encoded in the radio frequency signal and then transmitted to a host electronic device by re-energizing the transmitting coil.