Dual Piezo Linear Vibrator with Direct Contact Mass
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Solution Overview
Problem
Conventional vibration modules in electronic devices face challenges in miniaturization and functionality, particularly in providing strong vibration forces with fast response times while maintaining a thin design, and often suffer from size constraints and unwanted ringing issues.
Innovation Solution
A linear vibrator module is designed using a housing with a first and second piezo element and a movable mass, where the mass is in direct contact with both piezo elements, allowing for linear motion and simultaneous displacement in response to voltage applied to the piezo elements, optimizing vibration force and reducing ringing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If conventional vibration modules are used to provide strong vibration force, then vibration functionality is improved, but device size increases and integration in thin devices becomes difficult
Solution Approach 1:
The vibration module is segmented into two separate piezo elements (first and second piezo elements) that can independently displace, allowing each element to be optimized for force generation while keeping individual element sizes small. This segmentation enables the mass to be actuated from both sides simultaneously, achieving strong vibration force with compact dimensions suitable for thin devices.
2Volume of moving object
If conventional vibration modules are designed for miniaturization, then device integration is improved, but vibration response time and functionality are limited
Solution Approach 1:
The two piezo elements operate in alternating periodic cycles, where one element displaces while the other returns, creating continuous back-and-forth motion of the mass. This periodic action enables fast response times and sustained vibration functionality while maintaining a compact module size suitable for integration in thin devices.
3Adaptability or versatility
If conventional vibration modules are used, then basic vibration function is provided, but unwanted ringing occurs and haptic feedback quality is reduced
Solution Approach 1:
The dual piezo element configuration provides inherent feedback control where the displacement of one piezo element can be coordinated with the other to counteract unwanted vibrations and ringing. This feedback mechanism enhances haptic feedback quality by eliminating harmful oscillations while maintaining accurate vibration control.
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 solution provides a strong vibration force with fast response times, reduced size, and minimized ringing, enabling effective integration in thin devices while improving haptic feedback and reducing electromagnetic interference.
Implementation Method 1
The first piezo element and the second piezo element are inside the housing. The mass is configured to move inside the housing in response to a displacement of at least one of the first piezo element and the second piezo element.
Data Source
AI summary
Disclosed herein is an apparatus. The apparatus includes a housing, a first piezo element, a second piezo element, and a mass. The first piezo element and the second piezo element are inside the housing. The mass is movably mounted inside the housing. The mass is configured to move inside the housing in response to a displacement of at least one of the first piezo element and the second piezo element. The mass is simultaneously in direct contact with the first piezo element and the second piezo element.