Magnetic Scroll Wheel Structure for Wear-Free Tactile Feedback
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Solution Overview
Problem
Mechanical encoders in scroll wheels of input devices like mice and keyboards suffer from wear and tear, leading to poor contact and deterioration of segmented tactile feedback.
Innovation Solution
An input device with a scroll wheel structure incorporating a support frame, scroll wheel frame, positioning frame, magnetic member, and magnets that provide non-contact tactile feedback, allowing for clear segmented tactile feedback and the ability to switch between modes with varying resistance levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical encoder is used in the scroll wheel, then segmented tactile feedback can be generated through contact points, but the contact points are worn out over time resulting in poor contact and deterioration of tactile feedback
Solution Approach 1:
The patent replaces the mechanical contact-based encoder system with a magnetic field-based detection system. Magnets are arranged on the scroll wheel, and a magnetic sensor detects their positions without physical contact. This substitution eliminates wear from friction and contact between moving parts, resolving the contradiction between maintaining reliable tactile feedback and extending service life.
Solution Approach 2:
The patent introduces a magnetic field as an intermediary between the scroll wheel and the detection system. Instead of direct mechanical contact, the magnetic field transmits rotational position information from the scroll wheel to the magnetic sensor. This intermediary approach allows tactile feedback generation without physical wear, addressing both reliability and durability requirements.
2Duration of action of moving object
If a non-contact magnetic system is used, then wear and tear is prevented and service life is extended, but the ability to provide segmented tactile feedback may be compromised
Solution Approach 1:
The patent segments the magnetic field interaction into discrete detection points by strategically positioning multiple magnets around the scroll wheel's rotation path. The magnetic sensor detects these segmented magnetic signatures at specific angular positions, generating segmented tactile feedback corresponding to different scroll positions. This segmentation enables precise feedback while maintaining the wear-free benefits of non-contact operation.
Solution Approach 2:
The patent utilizes variations in magnetic field strength and polarity (analogous to color changes) as the scroll wheel rotates. Different magnet orientations and positions create distinct magnetic field patterns that the magnetic sensor detects, generating segmented tactile feedback. This approach maintains reliable feedback quality while avoiding mechanical wear through non-contact magnetic field detection.
3Force
If the magnet is positioned close to the magnetic member, then stronger magnetic interaction is achieved, but the structure becomes more complex and manufacturing is more difficult
Solution Approach 1:
The patent uses multiple magnets distributed around the scroll wheel rather than a single strong magnet. Each magnet creates a moderate magnetic field, but their combined effect provides sufficient magnetic interaction strength for reliable detection. This distributed approach simplifies manufacturing and assembly compared to positioning a single magnet in precise close proximity, while achieving the necessary magnetic force through cumulative effect.
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
Prevents deterioration of tactile feedback due to wear and tear, enhances user experience, and extends the service life of the input device by integrating a non-contact tactile feedback design.
Implementation Method 1
The magnet is separated from the first portion by a first distance and separated from the second portion by a second distance
Data Source
AI summary
An input device includes a housing having an opening and a scroll wheel structure disposed in the housing. The scroll wheel structure includes a support frame fixed in the housing, a scroll wheel frame, a positioning frame including a first body portion connected to the support frame and a second body portion disposed in the scroll wheel frame, a magnetic member disposed in the scroll wheel frame and including first and second portions, and a magnet. The scroll wheel frame is pivotally connected to the support frame via a pivot disposed at a center of the scroll wheel frame, and a portion of the scroll wheel frame is protruded out of the housing via the opening. The magnet is disposed at the positioning frame or the scroll wheel frame corresponding to the magnetic member and separated from the first and second portions by first and second distances, respectively.