Dual-Resonance Vibrating Actuator for Wideband Silent Haptics
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Solution Overview
Problem
Current vibrating actuators have limited frequency range, are noisy, and inefficient, making them unsuitable for providing high-definition haptic feedback for immersive experiences in audio, gaming, and music applications, which require a wideband frequency response and silent operation.
Innovation Solution
A vibrating actuator with two distinct resonant frequencies, designed to operate efficiently across a wide range of frequencies from 40 to 120 Hz, utilizing a chassis with elastic members and a configuration of magnets and coils that direct magnetic field lines orthogonally to the coils, reducing part count and enhancing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If standard linear resonant actuators are used, then the actuator structure is simple, but the frequency range is very narrow making them unsuitable for music and gaming applications
Solution Approach 1:
The actuator is divided into two separate moving parts, each with its own resonant frequency (first moving part: 40-80 Hz, second moving part: 80-120 Hz). This segmentation allows the system to cover a wide frequency range (40-120 Hz) while maintaining the simplicity of individual resonant actuator structures, resolving the contradiction between frequency range and structural complexity.
Solution Approach 2:
Two resonant actuator systems are merged into a single integrated device with shared components (chassis, elastic members, coils). The first and second moving parts operate simultaneously with different resonant frequencies, combining their capabilities to achieve wideband frequency response while reducing overall device complexity through component sharing.
2Object-affected harmful factors
If industrial vibrators with moving magnet and stationary coil are used, then the vibration generation is effective, but the device is noisy which makes it unsuitable for enhanced sound experience
Solution Approach 1:
The conventional configuration is inverted: instead of a stationary coil with moving magnet, the patent uses a stationary magnet arrangement with a moving coil assembly. This inversion reduces noise generation while maintaining effective vibration production, as the moving coil design produces less electromagnetic interference and mechanical noise compared to moving magnet designs.
Solution Approach 2:
The patent converts the potential harm of magnetic field leakage (which causes noise in conventional designs) into a benefit by using U-shaped brackets that guide and contain the magnetic field lines. The magnetic field lines that would otherwise be lost are now effectively utilized, reducing noise while maintaining vibration effectiveness.
3Loss of energy
If magnetic field lines are allowed to cross surrounding coils freely, then the coil design is simple, but the magnetic field lines are lost and not guided back to the magnets resulting in waste of potential magnetic field
Solution Approach 1:
U-shaped brackets are introduced as intermediary structures between the magnets and coils. These brackets guide the magnetic field lines from the magnets through the coils and back to the magnets, preventing field line loss and improving magnetic field efficiency. The U-shaped design provides a clear magnetic path without significantly increasing device complexity.
4Weight of moving object
If heavy moving mass is used for effective acceleration, then the vibration effectiveness is improved, but the device size increases making it difficult to make portable or wearable
Solution Approach 1:
The patent distributes the moving mass into two separate moving parts (first moving part with magnets, second moving part with coils) rather than concentrating it in one heavy component. Each moving part has optimized local mass distribution to achieve effective acceleration at its resonant frequency, while the overall device remains compact and suitable for portable applications.
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 actuator provides efficient wideband haptic feedback, improving performance and battery life in devices like gaming headsets and mobile phones by maintaining high-definition vibrations across a broad frequency range while being silent and cost-effective.
Implementation Method 1
The at least one coil 410 is wound over the arrangement of magnets 320... the vibration is generated by the interaction of a movable permanent magnet and a stationary coil surrounding it, wherein, due to the Laplace Force, an alternating current passing through the coil interacts with the magnetic field of the magnet and generates a mechanical force
Implementation Method 2
The chassis 110 comprises two parts 170; each of the two parts 170 of the chassis 110 is cut to form a first elastic member 150 and a second elastic member 160... The first moving part 210 is attached to the first elastic member 150 and the second moving part 220 is attached to the second elastic member 160
Implementation Method 3
The arrangement of magnets 320 has a pair of outer poles 328... an alternating current passing through the coil interacts with the magnetic field of the magnet and generates a mechanical force with changing direction on the magnet
Implementation Method 4
A vibrating actuator having two different resonant frequencies is disclosed... The first moving part 210 and the second moving part 220 with each of the first moving part and the second moving part suspended by a pair of elastic members
Data Source
AI summary
A vibrating actuator having two different resonant frequencies is disclosed. The vibrating actuator comprises a first moving part 210 having an arrangement of magnets 320. In one embodiment, the arrangement of magnets 320 comprises at least two magnets. The like poles of the magnets 320 face each other and the arrangement of magnets 320 has two outer poles 328. The vibrating actuator has a second moving part 210 having one or more coils 410. The one or more coils 410 are wound over the arrangement of the magnets 320 such that the first moving part 210 can freely slide into the second moving part 220. A chassis 110 is formed by two parts 170, and each part of the chassis 110 is cut to form a first elastic member 150 and a second elastic member 160.