Curved Haptic Actuator for Low-Frequency Wearable Feedback
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Solution Overview
Problem
Conventional haptic actuators are bulky and limited in transmitting tactile signals across various frequency ranges, particularly below 170 Hz, and are not suitable for delivering complex tactile sensations or being integrated into curved structures for wearable devices.
Innovation Solution
A curved haptic actuator with a movable vibrator and magnetic field generator, capable of generating vibrations in a low frequency band (20 Hz or below) and adaptable to curved surfaces, using a flexible printed circuit board and magnetic fluid dampers to provide tactile sensations like tapping and vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If conventional linear resonant actuators are used to provide haptic feedback, then vibration intensity can be maximized using resonant frequency, but the actuators become bulky and cannot meet space limitations
Solution Approach 1:
The patent applies curvature to the actuator structure by forming the housing, vibrator, and elastic body in a curved configuration. This curved design allows the actuator to conform to curved surfaces while maintaining its haptic functionality, effectively reducing the space required for installation in wearable devices with curved geometries
2Adaptability or versatility
If conventional haptic actuators operate at resonant frequencies equal to or greater than 160 Hz, then simple vibration can be provided, but various and complex tactile sensations cannot be delivered
Solution Approach 1:
The patent implements dynamic operation by enabling the actuator to function across a wide frequency range (20 Hz to 500 Hz) rather than being limited to a fixed resonant frequency. The controller dynamically adjusts operating parameters including frequency, waveform, and duty cycle to deliver diverse tactile sensations from low-frequency tapping to high-frequency vibration
Solution Approach 2:
The patent changes operational parameters by varying the driving frequency, waveform shape, and duty cycle of the coil activation. This allows the same physical actuator to produce different tactile perceptions by modifying electrical input parameters, enabling both low-frequency tapping sensations and high-frequency vibrations
3Adaptability or versatility
If conventional haptic actuators are designed for simple vibration transmission, then resonant frequency operation is effective, but transmission of tactile signals across various frequency ranges below 170 Hz is limited
Solution Approach 1:
The patent implements dynamic operation by enabling the actuator to function across a wide frequency range (20 Hz to 500 Hz) rather than being limited to a fixed resonant frequency. The controller dynamically adjusts operating parameters including frequency, waveform, and duty cycle to deliver diverse tactile sensations from low-frequency tapping to high-frequency vibration
Solution Approach 2:
The patent incorporates feedback mechanisms through elastic bodies that provide mechanical feedback during vibration. This feedback ensures reliable operation across different frequency ranges by maintaining controlled mechanical interaction between the vibrator and housing, enabling accurate tactile signal transmission
4Ease of manufacture
If conventional haptic actuators are designed with rigid structures, then manufacturing is simplified, but integration into curved structures for wearable devices becomes difficult
Solution Approach 1:
The patent applies curvature to the actuator structure by forming the housing, vibrator, and elastic body in a curved configuration. This curved design allows the actuator to conform to curved surfaces while maintaining its haptic functionality, effectively reducing the space required for installation in wearable devices with curved geometries
Solution Approach 2:
The patent employs flexible design elements including elastic bodies that can deform and adapt to curved configurations. The housing and internal components are designed with flexibility to conform to curved surfaces, enabling integration into wearable devices while maintaining structural integrity and manufacturing feasibility
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 the transmission of tactile sensations across a wide frequency band, including low frequencies, and can be integrated into various devices, such as VR gloves and smart clothing, providing localized and real-time tactile feedback.
Implementation Method 1
a coil for generating an electromagnetic force
Implementation Method 2
each elastic portion positioned on each of top and bottom surfaces as a spring for supporting the vibrator
Implementation Method 3
magnetic fluid dampers to provide tactile sensations
Data Source
AI summary
A curved haptic actuator according to an embodiment may comprise: a housing having a receiving space and having a shape where the receiving space and an outer appearance thereof are bent outward; a vibration unit disposed in the receiving space, being movable along the longitudinal direction of the housing, and having a shape bent upward; elastic bodies connected to an inner wall of the housing and both sides of the vibration unit; and a magnetic field generation unit which is installed on the inner wall of the housing and generates a magnetic field and applies the magnetic field to the vibration unit.