Linear Vibrator Design Using Substrate Through-Hole for Compact Force
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Solution Overview
Problem
Linear vibrators in personal mobile terminals face challenges in securing sufficient vibratory force due to limited mounting space, leading to restricted vibration amplitude and shortened lifespan caused by mechanical friction and electrical sparking in brush-type motors, and slow response times due to rotational inertia.
Innovation Solution
A linear vibrator design featuring a coil and magnet structure with an elastic member and substrate through hole to prevent contact, allowing for increased vibratory force and miniaturization, utilizing a magnetic fluid to smooth vertical motion and prevent abnormal vibrations, and employing multiple magnets with the same polarities to enhance magnetic efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the thickness of the linear vibrator is increased to secure sufficient vibratory force, then the vibratory force is improved, but the device size increases beyond available mounting space
Solution Approach 1:
The patent transitions from a conventional linear arrangement where components are stacked vertically to a configuration where the magnet passes through a through-hole in the substrate, allowing the magnetic field to interact with the coil from both sides. This dimensional change enables stronger electromagnetic interaction without increasing the overall thickness of the device, as the magnetic flux now travels through the substrate rather than requiring additional vertical space.
Solution Approach 2:
The magnet is positioned to pass through the through-hole of the substrate, effectively nesting the magnetic component within the existing structural footprint. This allows the magnetic field to be generated within the confined space of the mounting area while maintaining sufficient interaction distance with the coil for strong vibratory force generation.
2Volume of moving object
If a brush-type motor structure is used to generate vibrations, then the device can be miniaturized, but mechanical friction and electrical sparking occur reducing lifespan
Solution Approach 1:
The patent replaces the brush-type motor's mechanical contact system with a contactless electromagnetic interaction system. The coil generates electromagnetic force by interacting with the magnet through the substrate, eliminating brushes and commutators entirely. This substitution removes the sources of mechanical friction and electrical sparking while maintaining the ability to generate vibrations in a compact form factor.
Solution Approach 2:
The substrate with the through-hole serves as an intermediary that allows magnetic field penetration while providing structural support. The magnet passes through the substrate to interact with the coil, and the substrate's magnetic flux concentration effect enhances the electromagnetic interaction without requiring direct contact between components, thereby eliminating wear and extending lifespan.
3Productivity
If voltage is applied to a rotational motor, then vibrations can be generated, but rotational inertia causes delayed response time
Solution Approach 1:
Instead of using rotational motion as the intermediate step (as in traditional motors), the patent directly generates linear vibratory motion through electromagnetic interaction. The coil and magnet system produces linear force directly without rotational inertia, inverting the conventional approach of converting electrical energy to rotational motion and then to linear vibration. This eliminates the time delay associated with overcoming rotational inertia.
Solution Approach 2:
The patent directly generates mechanical vibrations through electromagnetic force interaction between the coil and magnet. The system is designed to resonate at specific frequencies, directly producing the desired vibratory motion without the intermediate rotational step. This direct vibration generation approach significantly reduces response time compared to rotational motors that must first accelerate and then convert motion.
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 design achieves stable and efficient linear vibrations with increased vibratory force, improved lifespan, and reduced mechanical friction, while maintaining a compact form factor, by ensuring non-contact states between components and optimizing magnetic flux.
Implementation Method 1
a vibration part including a coil disposed to face the magnet to generate electromagnetic force by interacting with the magnets
Implementation Method 2
an elastic member coupled to the fixing part and the vibration part to provide an elastic force
Data Source
AI summary
A linear vibrator, including: a fixing part providing an inner space having a predetermined size; at least one magnet disposed in the inner space of the fixing part to generate a magnetic force; a vibration part including a coil disposed to face the magnet to generate electromagnetic force by interacting with the magnet, and a mass body being vibrated; an elastic member coupled to the fixing part and the vibration part to provide an elastic force; and a substrate coupled to the vibration part and disposed to surround at least a portion of an outer circumferential surface of the magnet so as to prevent the substrate from contacting the magnet when the vibration part is vibrated.