Piezoelectric Linear Motor Elastic Structure for Stronger Haptics
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Solution Overview
Problem
Current haptic feedback systems using piezoelectric materials suffer from slow response speed and low feedback intensity due to the inflexible structure of elastic pieces, resulting in inadequate user perception.
Innovation Solution
A piezoelectric linear motor design featuring a piezoelectric actuator with an elastic structure fixed to its sides, where connecting legs extend at an angle less than 45° to enhance displacement magnification, allowing for greater haptic feedback intensity and improved response speed by converting small actuator length changes into significant elastic structure displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If elastic pieces with inflexible structure are used, then the structure is simple, but the elastic force is small and deformation capability is poor, resulting in slow haptic feedback response speed and low feedback intensity
Solution Approach 1:
The elastic structure is divided into multiple elastic pieces (first elastic piece, second elastic piece, third elastic piece) with different orientations and functions. Each elastic piece is segmented into specific regions (first region, second region, third region) with different thicknesses to optimize deformation characteristics. This segmentation allows each piece to contribute differently to the overall haptic feedback performance, improving response speed while maintaining manageable complexity.
Solution Approach 2:
Different regions of the elastic pieces have different thicknesses to create local quality variations. The first region has a first thickness, the second region has a second thickness, and the third region has a third thickness. This local quality differentiation allows specific areas to have different stiffness and deformation characteristics, enabling faster response in critical areas while maintaining overall structural integrity.
2Force
If elastic pieces with inflexible structure are used, then the structure is simple, but the feedback intensity is low and not easily perceived
Solution Approach 1:
The elastic structure is divided into multiple elastic pieces (first elastic piece, second elastic piece, third elastic piece) with different orientations and functions. Each elastic piece is segmented into specific regions (first region, second region, third region) with different thicknesses to optimize deformation characteristics. This segmentation allows each piece to contribute differently to the overall haptic feedback performance, improving response speed while maintaining manageable complexity.
Solution Approach 2:
Different regions of the elastic pieces have different thicknesses to create local quality variations. The first region has a first thickness, the second region has a second thickness, and the third region has a third thickness. This local quality differentiation allows specific areas to have different stiffness and deformation characteristics, enabling faster response in critical areas while maintaining overall structural integrity.
3Length of moving object
If the connecting legs extend at an angle less than 45°, then the displacement magnification is enhanced, but the structural stability may be reduced
Solution Approach 1:
The elastic structure is divided into multiple elastic pieces (first elastic piece, second elastic piece, third elastic piece) with different orientations and functions. Each elastic piece is segmented into specific regions (first region, second region, third region) with different thicknesses to optimize deformation characteristics. This segmentation allows each piece to contribute differently to the overall haptic feedback performance, improving response speed while maintaining manageable complexity.
Solution Approach 2:
The connecting legs extend at asymmetric angles less than 45° relative to the piezoelectric actuator, creating an asymmetric elastic structure. This asymmetric configuration optimizes the displacement magnification effect while the multiple elastic pieces provide structural stability through their collective arrangement.
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 enhanced haptic feedback intensity and faster response times by maximizing displacement of the elastic structure perpendicular to the actuator's telescopic direction, making the feedback more perceivable and reducing the motor's thickness.
Implementation Method 1
haptic feedback can be realized by using an inverse piezoelectric effect of a piezoelectric material. For example, when a voltage is applied to the piezoelectric material, the piezoelectric material deforms
Implementation Method 2
The elastic structure includes at least two sets of elastic connecting portions fixed to end portions of the piezoelectric actuator... allowing for greater haptic feedback intensity and improved response speed by converting small actuator length changes into significant elastic structure displacement
Data Source
AI summary
A piezoelectric linear motor and an electronic device, including a piezoelectric actuator and an elastic structure fixed to two opposite sides of the actuator. The piezoelectric actuator extends/retracts to drive the elastic structure to move when a voltage is applied. The elastic structure includes sets of elastic connecting portions fixed to end portions of the piezoelectric actuator, each set includes two connecting legs fixed to two opposite sides of the piezoelectric actuator, each connecting leg extends toward an outer side of the piezoelectric actuator, and connecting legs located at a same side of the piezoelectric actuator extend away from each other, and an angle is formed between each of the connecting legs and a plane where the piezoelectric actuator is located. The connecting legs have better flexibility, the elastic structure has stronger deformation capability, a haptic feedback response speed is increased and thickness of the piezoelectric linear motor is reduced.