Multi-Layer Inductor Haptic Actuator for Slim Mobile Devices
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Solution Overview
Problem
Existing haptic actuators are bulky and unable to efficiently deliver haptic feedback within height-constrained devices, such as mobile devices, without compromising performance.
Innovation Solution
A slim haptic actuator system utilizing a multi-layer inductor and magnetic element configuration, where a multi-layer inductor is integrated with a magnetic element to oscillate within a constrained chassis, delivering haptic feedback through alternating magnetic coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional haptic actuator is used, then haptic feedback performance is achieved, but the device height increases and becomes bulky
Solution Approach 1:
The patent transitions from a traditional linear motor structure to a planar inductor structure that operates in a two-dimensional plane rather than requiring vertical stacking. The inductor layers are arranged in adjacent planes with magnetic elements positioned between them, enabling haptic actuation within a constrained height profile while maintaining effective magnetic coupling through the alternating polarity design.
Solution Approach 2:
The patent implements a nested configuration where multiple inductor layers with alternating polarities are stacked in adjacent planes, with magnetic elements positioned between these layers. This nested arrangement allows the magnetic fields of different layers to interact through the shared magnetic elements, achieving cumulative haptic force while maintaining a compact vertical footprint.
2Length of moving object
If the haptic actuator is made slim to fit height-constrained devices, then device form factor is improved, but haptic feedback efficiency decreases
Solution Approach 1:
The patent employs asymmetric magnetic pole arrangements where adjacent inductor layers have opposite polarities (first polarity vs. second polarity). This asymmetric design creates focused magnetic field gradients between the layers that interact with the magnetic elements, generating efficient haptic forces within a reduced height distance while maintaining strong magnetic coupling.
Solution Approach 2:
The patent utilizes a composite structure combining multiple inductor layers with alternating polarities and magnetic elements positioned between them. This composite arrangement creates a multi-layer magnetic system where the combined effect of multiple magnetic field interactions produces enhanced haptic feedback efficiency within a compact form factor, overcoming the limitations of single-layer slim designs.
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 system effectively delivers haptic feedback to users by oscillating the device chassis and touchscreen, providing tactile responses within a slim form factor suitable for mobile devices and other height-constrained environments.
Implementation Method 1
delivering haptic feedback through alternating magnetic coupling
Implementation Method 2
oscillating the device chassis and touchscreen, providing tactile responses within a slim form factor
Data Source
AI summary
One variation of a system for a haptic actuator includes: a substrate; a baseplate; a magnetic element; and a set of spacer elements. The substrate includes: a first layer including a first spiral trace coiled in a first direction; and a second layer. The second layer is arranged below the first layer and includes a second spiral trace: coiled in a second direction opposite the first direction; and coupled to the first spiral trace to form an inductor. The substrate further includes terminals arranged about a periphery of the substrate and coupled to the inductor. The baseplate is arranged opposite the substrate. The magnetic element is: arranged on the baseplate; and defines a first polarity facing the inductor. The first set of spacer elements are: interposed between the baseplate and the substrate; arranged proximal edges of the baseplate; and defines a nominal gap between the magnetic element and the inductor.