Magnetic Roller Input Control for Adjustable Scrolling Resistance

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Solution Overview

Problem

Mechanical roller input devices provide insufficient operation in scenarios requiring long-term or fine scrolling, lacking flexibility in resistance adjustment.

Innovation Solution

A roller input device incorporating a magnetic assembly with an electromagnet and a magnetic-conductive element, allowing switching between modes to control magnetic attraction forces, providing stepped operation or smooth rotation based on user needs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a mechanical roller input device is used, then the structure is simple, but the operation precision and adaptability are insufficient for long-term or fine scrolling

Engineering Contradiction:

Improveoperation precisionVSAvoiddevice complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent replaces the traditional mechanical roller structure with a magnetic field-based system. The roller surface is replaced by a magnetic-conductive element that interacts with magnetic protrusions through magnetic attraction forces, eliminating mechanical contact and enabling precise control of resistance and operation mode without complex mechanical components.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces an electromagnet that can change its magnetic field strength and polarity dynamically. By controlling the current to the electromagnet, the system can adjust the magnetic attraction force between the magnetic-conductive element and magnetic protrusions, thereby changing the resistance and operation characteristics of the roller in real-time without physical modification.

Inventive Principle:

Principle #35Parameter changes

2Duration of action of moving object

If the roller operates for a long time or distance, then the durability is improved, but the mechanical wear and resistance increase

Engineering Contradiction:

Improveduration of operationVSAvoidmechanical durability

Core Design Contradiction:

Duration of action of moving objectVSReliability

Solution Approach 1:

The patent eliminates mechanical contact between the roller surface and the magnetic assembly by using magnetic field interaction. The magnetic-conductive element on the roller base interacts with magnetic protrusions through magnetic attraction forces, preventing mechanical wear and friction that would otherwise occur during prolonged operation.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent converts the magnetic attraction force, which could be considered a resistive force in traditional mechanisms, into a beneficial control mechanism. By adjusting the magnetic field strength, the system can provide controlled resistance for precise operation while avoiding the harmful effects of mechanical friction and wear.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Measurement precision

If the roller provides fine scrolling operation, then the precision is improved, but the resistance and mechanical error increase

Engineering Contradiction:

Improvescrolling precisionVSAvoidresistance force

Core Design Contradiction:

Measurement precisionVSForce

Solution Approach 1:

The patent uses the electromagnet to dynamically adjust the magnetic field strength, which controls the magnetic attraction force between the magnetic-conductive element and magnetic protrusions. By varying this parameter, the system can provide appropriate resistance for fine scrolling operations while maintaining precision through controlled magnetic interaction rather than fixed mechanical contact.

Inventive Principle:

Principle #35Parameter 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

Enhances user experience by offering adjustable resistance for long-term operations or fine scrolling, reducing mechanical errors and noise, and improving operational efficiency.

Implementation Method 1

When the electromagnet is in the first mode, the coil conducts a forward current, so that the magnetic-conductive element is magnetized to have a magnetic property

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 2

a magnetic attraction force is between the convex portion and the corresponding one of the magnetic protrusions

Methodology Applied

Scientific EffectMagnetic attraction: Magnetism

Data Source

PatentUS12386439B2Roller input device

Publication Date: 2025.08.12 CHICONY ELECTRONICS CO LTD

AI summary

A roller input device includes a base, a roller, a magnetic assembly, and a magnetic-conductive element. The roller is rotatably disposed on the base and includes a main body and magnetic protrusions arranged around a peripheral portion of the main body. The magnetic assembly is disposed on one side of the base and includes an electromagnet and a permanent magnet. The electromagnet includes a coil. The magnetic-conductive element is disposed on the base and between the roller and the magnetic assembly, and a side surface of the magnetic-conductive element facing the roller has a convex portion. When the electromagnet is in a first mode, the coil conducts a forward current, so that the magnetic-conductive element is magnetized to have a magnetic property. When the electromagnet is in a second mode, the coil conducts a reverse current, so that the magnetic-conductive element does not have the magnetic property.