Pressure Sensing Stylus Using Magnetic Field Detection
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Solution Overview
Problem
Existing force styluses have complex internal assemblies, high production costs, and low productivity due to the use of resistance pressure strain gauges and complex assembly processes, which affect user experience and product reliability.
Innovation Solution
A stylus design that employs a magnetic component and detection module to sense writing pressure, eliminating the need for a pressure sensor and simplifying the assembly process by using a touch element elastically connected to a blocking element, with a main control module adjusting handwriting thickness based on detected magnetic field intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a resistance pressure strain gauge is used as the pressure sensor, then the pressure detection function is achieved, but the device complexity and production cost increase
Solution Approach 1:
The patent extracts and eliminates the complex resistance pressure strain gauge from the stylus structure. Instead, it uses a simple magnetic component (magnet) attached to the nib assembly that moves with the touch element, coupled with a magnetic sensor (such as Hall sensor or magnetoresistive sensor) fixed in the housing. This substitution dramatically simplifies the internal assembly while maintaining pressure detection capability through magnetic field changes.
Solution Approach 2:
The patent replaces the mechanical resistance pressure strain gauge system with a magnetic field-based detection system. The magnetic component moves in response to touch element displacement, and the magnetic sensor detects the resulting magnetic field changes. This substitution eliminates the need for complex mechanical strain gauge assemblies and their associated wiring, reducing device complexity while preserving measurement functionality.
2Reliability
If a connection cable is used to connect the pressure sensor and main control module, then the pressure signal can be transmitted, but the assembly process becomes complex and productivity decreases
Solution Approach 1:
The patent merges the magnetic sensor directly with the main control module circuit board, eliminating the need for separate connection cables. The magnetic sensor is mounted on the circuit board and electrically connected through printed circuit traces rather than wire harnesses. This integration simplifies the assembly process significantly, as the sensor and control module become a single assembled unit, improving productivity while maintaining reliable signal transmission.
3Reliability
If a connection cable is used to connect the pressure sensor and main control module, then the pressure signal can be transmitted, but the assembly process complexity increases and product success rate decreases
Solution Approach 1:
The patent integrates the magnetic sensor directly onto the main control module circuit board, eliminating the need for separate connection cables and complex wiring assemblies. This merging of components reduces the number of parts and assembly steps, simplifying the overall assembly process while maintaining reliable electrical and signal connections through the circuit board infrastructure.
Solution Approach 2:
The patent extracts and eliminates the connection cable from the system architecture. By using a magnetic sensor that can be directly mounted on the circuit board and communicating through integrated circuits or printed circuit traces, the design removes the intermediate connection cable component entirely, reducing assembly complexity and potential failure points while maintaining signal transmission reliability.
4Measurement precision
If a resistance pressure strain gauge is used, then pressure detection is achieved, but the manufacturing cost increases
Solution Approach 1:
The patent employs inexpensive magnetic components (standard magnets) and common magnetic sensors (Hall sensors or magnetoresistive sensors) that are widely available and low-cost compared to resistance pressure strain gauges. These components can be easily attached using simple methods such as adhesive or snap-fits, and the magnetic sensor can be mounted on the circuit board using standard SMT or through-hole techniques, significantly reducing manufacturing costs while maintaining functional equivalence.
Solution Approach 2:
The patent replaces the expensive mechanical resistance pressure strain gauge system with a magnetic field-based system using inexpensive magnets and magnetic sensors. This substitution eliminates the need for precision mechanical assemblies, specialized strain gauge materials, and complex calibration procedures, thereby reducing manufacturing costs while preserving pressure detection capability through magnetic field changes.
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 design reduces production costs, simplifies assembly, improves productivity, and enhances user experience by providing different writing effects without the need for a pressure sensor, while maintaining reliability and adaptability to various environments.
Implementation Method 1
a magnetic component, disposed in the housing and fixed on the touch element, and moving with a movement of the nib, and a detection module disposed in the housing and configured to detect a value of magnetic field intensity of the magnetic component
Implementation Method 2
The touch element is elastically connected to the blocking element
Data Source
AI summary
A stylus includes a touch element, a main control module configured to change thickness of handwriting on a touch screen, and a blocking element configured to limit a movement of the touch element. The touch element is elastically connected to the blocking element, and a head of the touch element forms a nib. The stylus further includes a magnetic component moving with a movement of the nib, and a detection module configured to detect a value of magnetic field intensity of the magnetic component. The magnetic component and the detection module are spaced from each other. The detection module is electrically connected to the main control module, and the value of writing force that the touch element is applied to the touch screen is in a preset proportion to the value of magnetic field intensity of the magnetic component detected by the detection module.