Low Profile Haptic Actuator Using Planar Coil Arrangement
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Solution Overview
Problem
Current haptic feedback systems in mobile devices lack a low profile design, which limits their compactness and versatility in producing complex haptic effects and integrating with various devices.
Innovation Solution
A low profile haptic actuator system comprising a moveable surface with a coil and a ferrite material, a fixed surface with a coil, and a suspension system, controlled by a controller that detects changes in inductance to produce haptic effects and support user interaction, while also enabling wireless charging of devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If traditional haptic actuator designs are used, then haptic feedback functionality is achieved, but the profile height is large and compactness is reduced
Solution Approach 1:
The patent transitions from a traditional linear stack configuration to a planar arrangement where coils are positioned adjacent to each other in the same plane. The movable surface with its coil and ferrite material is positioned next to the fixed surface with its coil, rather than stacking one on top of the other. This dimensional reconfiguration dramatically reduces the profile height while maintaining the electromagnetic interaction necessary for haptic feedback generation.
Solution Approach 2:
The patent integrates multiple functional components within a compact planar structure. The movable surface containing the coil and ferrite material is positioned within the same planar footprint as the fixed surface components. The suspension system connects these elements in a space-efficient manner, nesting the haptic actuation mechanism within a minimal volume to achieve low profile height without sacrificing functionality.
2Adaptability or versatility
If simple haptic actuator designs are used, then basic haptic feedback is provided, but the ability to produce complex haptic effects is limited
Solution Approach 1:
The patent designs the movable surface and fixed surface coils to be configurable in various arrangements, enabling the same basic structure to produce multiple types of haptic effects. By adjusting the configuration of coils and ferrite materials, the system can generate different vibration patterns, resistance forces, and tactile feedback characteristics, making it universally applicable for complex haptic effects without requiring multiple separate actuators.
Solution Approach 2:
The patent incorporates a suspension system that allows the movable surface to dynamically respond to electromagnetic forces from the fixed surface coil. This dynamic configuration enables real-time adjustment of haptic effects through controlled movement and positioning of the movable components, allowing the system to produce complex, variable haptic feedback rather than fixed, simple vibrations.
3Ease of operation
If haptic actuators are integrated into mobile devices, then user interaction is enhanced, but the available space for other components is reduced
Solution Approach 1:
The patent reconfigures the haptic actuator from a vertical stacking arrangement to a planar layout that fits within the surface area of mobile devices without increasing thickness. By positioning coils and ferrite materials side-by-side in the same plane rather than stacking them vertically, the design maintains a minimal profile height that preserves valuable internal volume for batteries, processors, and other essential components while still providing enhanced user interaction through haptic feedback.
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
Enables compact, versatile, and complex haptic feedback capable of simulating various tactile experiences and charging mobile devices, enhancing user interaction and device integration.
Implementation Method 1
a moveable surface comprising a first coil and a ferrite material... a fixed surface beneath the moveable surface, the fixed surface comprising a second coil coupled underneath the first coil
Implementation Method 2
the controller is configured to detect a change in inductance in the second coil, and wherein the change in inductance is associated with one or more of movement of the moveable surface or pressure applied to the moveable surface
Implementation Method 3
the current is configured to charge a battery of a device near the moveable surface
Data Source
Figure 1A
Figure 1B~1C
Figure 2A~2B
AI summary
Systems and methods or a low profile haptic actuator are disclosed. In one embodiment, a system for a low profile haptic actuator includes: a moveable surface comprising a first coil, the moveable surface configured to move in a degree of freedom; a fixed surface beneath the moveable surface, the fixed surface comprising a second coil coupled underneath the first coil; a suspension coupled to the fixed surface and the moveable surface and configured to suspend the moveable surface; and a controller coupled to the first coil and the second coil.