Electromagnetic Eccentric Wheel Layout for Multi-Directional Haptics
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Solution Overview
Problem
Current vibration modules in electronic devices, such as smartphones and tablets, are limited in size reduction and can only provide vibrations in a single direction due to their design, which includes a rotary motor and eccentric member, making miniaturization and multi-directional vibration generation challenging.
Innovation Solution
A tactile feedback mechanism utilizing electromagnetic force is developed, comprising a stator, an eccentric wheel, and an electromagnetic driving assembly, where the eccentric wheel and driving assembly are positioned on the same plane, allowing for reduced thickness and the ability to generate vibrations in multiple directions by using magnetic elements and induction coils to drive the eccentric wheel, enabling vibrations in one, two, or three directions independently or simultaneously.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a rotary motor and eccentric member are used to generate vibration, then the vibration function can be achieved, but the size of the vibration module cannot be reduced further
Solution Approach 1:
The vibration module is divided into multiple independent driving assemblies, each capable of driving a movable portion to vibrate in a specific direction. This segmentation allows for more flexible spatial arrangement and size optimization while maintaining vibration functionality.
Solution Approach 2:
The traditional rotary motor and eccentric member mechanical system is replaced with an electromagnetic driving assembly comprising magnetic elements and induction coils. This substitution eliminates the need for a rotating shaft and external eccentric member, allowing the movable portion to be positioned directly within the driving assembly, thereby reducing overall module size.
2Adaptability or versatility
If a rotary motor and eccentric member are used, then vibration can be generated, but the vibration module can only provide vibration in a single direction or on a plane
Solution Approach 1:
The vibration module is divided into multiple independent driving assemblies (first driving assembly, second driving assembly, etc.), each capable of generating vibration in a different direction. This segmentation enables multi-directional vibration capability while keeping each individual driving assembly relatively simple in structure.
Solution Approach 2:
Each driving assembly is designed with universal functionality to drive its corresponding movable portion to vibrate. By arranging multiple such universal driving assemblies in different spatial orientations, the system achieves multi-directional vibration capability without requiring complex specialized mechanisms for each direction.
3Length of moving object
If the eccentric member is disposed outside of the rotary motor, then the vibration function is achieved, but the length of the vibration module cannot be decreased
Solution Approach 1:
The movable portion is positioned within the driving assembly, with the magnetic element and induction coil arranged in a nested configuration. The movable portion is suspended between the magnetic element and the induction coil, allowing all components to occupy the same spatial region rather than extending outward, thereby reducing the overall length of the vibration module.
Solution Approach 2:
The traditional planar arrangement of rotary motor and external eccentric member is transformed into a three-dimensional nested structure. The movable portion is positioned in the space between the magnetic element and induction coil, utilizing the Z-axis dimension for vibration generation while keeping the X and Y dimensions compact, thus reducing the overall length of the module.
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 solution achieves miniaturization of vibration devices and enables the generation of distinct vibrations in multiple directions, allowing for varied notification methods in electronic devices, such as smartphones and tablets, by utilizing electromagnetic forces to drive the eccentric wheel, thus overcoming the limitations of traditional rotary motor-based systems.
Implementation Method 1
The first induction coil acts with the first magnetic element to drive the first movable portion to move along a first direction
Data Source
AI summary
The present disclosure provides a vibration device, including a stator, an eccentric wheel and an electromagnetic driving assembly. The eccentric wheel rotates around a rotating shaft relative to the stator. The electromagnetic driving assembly includes at least one magnetic element and an induction coil. The at least one magnetic element is disposed on the eccentric wheel. The induction coil corresponds to the magnetic element, and the induction coil is disposed on the stator. When a current is applied to the induction coil, the induction coil acts with the magnetic element to generate an electromagnetic force to drive the eccentric wheel to rotate around the rotating shaft, so that the vibration device generates a vibration. The rotating shaft is disposed on the stator.