Linear Resonant Actuator Elastic Suspension Parallel Motion
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Solution Overview
Problem
Conventional linear resonant actuators (LRAs) with elastic suspension systems provide less-than-expected vibration effects due to the simple harmonic motion being more of a left-and-right swing rather than parallel motion, leading to reduced vibration in portable electronic devices, and increasing current to enhance vibration results in overheating and high power consumption.
Innovation Solution
The design incorporates an elastic suspension system with multiple bends greater than 90°, allowing the movable structure to approximate parallel motion during simple harmonic motion, thereby enhancing vibration effect without increasing coil current, thus reducing temperature and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the current to the coil is increased to enhance the vibration effect, then the vibration effect is improved, but the temperature and power consumption increase significantly
Solution Approach 1:
The patent changes the geometric parameters of the elastic suspension system by using multiple bends with obtuse angles (greater than 90°) instead of a single bend with angle ≤90°. This structural parameter change modifies the motion trajectory to achieve better parallel movement, enhancing vibration effect without increasing current.
2Strength
If the current to the coil is increased to enhance the vibration effect, then the vibration effect is improved, but the temperature increases leading to overheating
Solution Approach 1:
The patent modifies the geometric parameters of the elastic suspension system by using multiple bends with obtuse angles (greater than 90°) instead of a single bend with angle ≤90°. This structural parameter change modifies the motion trajectory to achieve better parallel movement, enhancing vibration effect without increasing current.
3Device complexity
If the elastic suspension system uses a single bend with angle ≤90°, then the structure is simple, but the movable structure performs left-and-right swing instead of parallel motion reducing vibration effect
Solution Approach 1:
The patent segments the suspension portion into multiple bends (at least two bends) instead of a single bend. This segmentation allows the elastic sheet to follow a more complex trajectory that approximates parallel motion, improving vibration effect while maintaining structural simplicity through the use of continuous elastic material.
Solution Approach 2:
The patent uses curved bends with obtuse angles (greater than 90°) in the elastic suspension system. These curved segments guide the movable structure through a trajectory that approximates parallel motion, transforming the motion pattern from left-and-right swing to superior parallel vibration.
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 approach provides superior vibration effects to portable electronic devices while minimizing overheating and power consumption, effectively addressing the limitations of conventional LRAs.
Implementation Method 1
the Lorentz force generated by electromagnetic effects to drive the movable part in a simple harmonic motion to cause vibration
Implementation Method 2
the Lorentz force generated by electromagnetic effects to drive the movable part in a simple harmonic motion
Implementation Method 3
the elastic suspension system returns the movable structure to the original position
Data Source
AI summary
A linear vibration actuator is provided, comprising a movable structure, a coil and an elastic suspension system. The elastic suspension system comprises a first and a second elastic sheets, and the first and second elastic sheet respectively comprising a first and a second fixed portions, a first and a second suspension portions, and a first and a second engaging portions. Both first and second suspension portions comprise a bend with an angle greater than 90°. The elastic suspension system enables the simple harmonic motion of the movable structure approximating a parallel motion to improve vibration effect without increasing current outputted to the coil, so as to reduce temperature and power consumption of the present invention. As a result, the present invention is able to provide superior vibration effect to portable electronic product and solve the overheating and power consumption problems.