Rotary Encoder Magnetic Detent Tactile Feedback
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Solution Overview
Problem
Conventional rotary encoders using mechanical detents for tactile feedback face issues such as wear, corrosion, and complex manufacturing, leading to inconsistent feedback and operator errors.
Innovation Solution
A rotary encoder system utilizing a multipole ring magnet with alternating polarity sectors and Hall effect sensors to generate tactile feedback through magnetic detents, eliminating the need for mechanical structures and providing consistent feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical detents are used to generate tactile feedback, then tactile feedback is provided, but wear and corrosion occur leading to inconsistent feedback
Solution Approach 1:
The patent replaces mechanical detents with magnetic detents. Instead of using physical interlocking ridges or bent metal structures that wear out, the invention uses magnetic fields generated by magnets arranged in a pattern on the encoder disk to create tactile feedback. The magnetic interaction between the encoder shaft magnets and the encoder housing magnets provides detent forces without mechanical contact, eliminating wear and corrosion issues while maintaining reliable tactile feedback throughout the service life.
2Reliability
If mechanical detents are used to generate tactile feedback, then tactile feedback is provided, but complex manufacturing processes are required
Solution Approach 1:
The patent replaces complex mechanical detent structures with a magnetic field-based system. Instead of manufacturing precise interlocking mechanical features, the invention uses magnets that can be arranged on the encoder disk and housing. This magnetic approach simplifies manufacturing by eliminating the need for complex three-dimensional mechanical detent structures while providing consistent tactile feedback through magnetic field interactions.
3Reliability
If mechanical contacts are used, then tactile feedback is generated, but corrosion and foreign matter compromise the feedback
Solution Approach 1:
The patent eliminates mechanical contacts by using magnetic fields for tactile feedback generation. The magnetic detent system uses non-contact magnetic interactions between magnets on the encoder disk and magnets on the encoder housing, completely avoiding the problems of corrosion and foreign matter accumulation that plague mechanical contact systems. This ensures consistent tactile feedback regardless of environmental conditions.
4Duration of action of moving object
If magnetic detents are used instead of mechanical detents, then wear and corrosion are eliminated, but the system complexity increases
Solution Approach 1:
The patent integrates multiple functions into the magnetic detent system. The same magnets that provide tactile feedback also serve as part of the encoder signaling mechanism. The magnetic field interactions simultaneously provide both the detent forces for tactile feedback and the magnetic patterns detected by sensors for position encoding. This multi-functionality reduces overall system complexity compared to having separate mechanical detent structures and encoder components.
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 detent system offers durable, consistent tactile feedback, increased sensing bandwidth, and simplified manufacturing, while avoiding issues like corrosion and wear, with improved accuracy and reliability.
Implementation Method 1
the plurality of magnetic field sensor integrated circuits, each magnetic field sensor is configured to detect a magnetic field generated during the rotation of the polarity sectors of the multipole ring magnet
Implementation Method 2
the plurality stationary magnets configured to interact with the polarity sectors of the multipole ring magnet to generate tactile feedback in the knob rotation
Data Source
AI summary
A rotary encoder and rotary encoder system that provides rotation detection and generates tactile feedback using a single magnetic mechanism and without relying on mechanical detects. The rotary encoder utilizes a ring magnet attached to a knob, two Hall Effect sensors that detect movement information for the processor, and magnets that are mounted to the surface of the platform. As the knob and multipole ring magnet get rotated, the ring magnet is subjected to opposing forces due to the magnets mounted to the platform surface, causing an unstable position that is experienced as tactile feedback by the user rotating the knob. Releasing the knob snaps the magnetic ring into one of many fixed positions, thus providing further tactile feedback.