Magnetic Roller Device Hall Sensor Layout for Compact Handwriting Input

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Solution Overview

Problem

Current handwriting device rollers, either mechanical or touch, face issues of large size, ease of disturbance, and poor production consistency, with mechanical rollers occupying space and touch rollers being prone to errors.

Innovation Solution

A magnetic roller device incorporating a multipole magnet and Hall components connected to an MCU, where the Hall components are evenly spaced within the magnetic field, allowing for precise calculation of rotation information, including direction and speed, to facilitate compact, stable, and consistent data adjustment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If mechanical rollers are used, then stable characteristics are achieved, but device size increases and space occupation increases

Engineering Contradiction:

ImprovestabilityVSAvoiddevice size

Core Design Contradiction:

ReliabilityVSVolume of moving object

Solution Approach 1:

The patent replaces the mechanical roller system with a magnetic field-based detection system. Instead of using mechanical rollers that physically contact and move across the surface, the invention uses a multipole magnet attached to a rotating element that generates a magnetic field detected by Hall effect sensors. This substitution eliminates the need for large mechanical structures while maintaining stable operation characteristics.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the fundamental operating parameter from mechanical contact and movement to magnetic field interaction. By using magnetic field strength and spatial distribution as the detection parameter instead of mechanical position and contact force, the system achieves stability with a much smaller physical footprint.

Inventive Principle:

Principle #35Parameter changes

2Weight of moving object

If touch rollers are used, then device weight decreases, but susceptibility to disturbance increases and production consistency deteriorates

Engineering Contradiction:

Improvedevice weightVSAvoidanti-disturbance capability

Core Design Contradiction:

Weight of moving objectVSReliability

Solution Approach 1:

The patent replaces the touch roller system with a magnetic field-based detection system. Instead of using touch rollers that rely on physical contact and friction, the invention uses a multipole magnet with Hall effect sensors that detect magnetic field changes. This substitution eliminates susceptibility to mechanical disturbances while maintaining light weight.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Weight of moving object

If touch rollers are used, then device weight decreases, but production consistency deteriorates

Engineering Contradiction:

Improvedevice weightVSAvoidproduction consistency

Core Design Contradiction:

Weight of moving objectVSManufacturing precision

Solution Approach 1:

The patent replaces the touch roller system with a magnetic field-based detection system. The multipole magnet and Hall effect sensors can be precisely manufactured and positioned using standard semiconductor fabrication techniques, achieving high production consistency that cannot be obtained with mechanical touch roller assemblies.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

4Reliability

If mechanical rollers are used, then stable characteristics are achieved, but circuit board space occupation increases

Engineering Contradiction:

ImprovestabilityVSAvoidcircuit board space

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

The patent replaces the mechanical roller system with a magnetic field-based detection system. The Hall effect sensors and multipole magnet occupy minimal space on the circuit board compared to mechanical rollers, allowing for compact device design while maintaining stable operation.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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

The magnetic roller device provides a compact, disturbance-resistant, and highly consistent solution for handwriting devices by leveraging the Hall effect to calculate rotation information, overcoming the limitations of traditional rollers.

Implementation Method 1

A magnetic roller device includes a multipole magnet, an MCU, a plurality of Hall components

Methodology Applied

Scientific EffectHall effect: Hall Effect

Data Source

PatentUS11714099B2Magnetic roller device and rotation information calculating method thereof

Publication Date: 2023.08.01 HANVON UGEE TECH CO LTD

AI summary

A magnetic roller device and a method for calculating rotation information thereof are disclosed. The magnetic roller device includes a multipole magnet, an MCU, plurality of Hall components, and a roller disposed on a handwriting device, wherein the multipole magnet is disposed on the roller, the multipole magnet includes at least one pair of magnetic poles with opposite polarities, and output ends of the plurality of Hall components are connected to an input end of the MCU; the plurality of Hall components are all located on a same plane of a magnetic field sensing space of the multipole magnet, and distances between each of the plurality of Hall components and the multipole magnet are equal; and a distance between two adjacent ones of the plurality of Hall components is less than half of a width of each magnetic pole in the multipole magnet.