Low-Profile Piezoelectric Vibration Device with Localized Plate Connection
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Solution Overview
Problem
Conventional vibration devices face challenges in miniaturization due to the need for sufficient space between vibration elements and plates, and direct connection methods can diminish vibration intensity, making it difficult to achieve a low-profile design while maintaining effective vibration.
Innovation Solution
A vibration device design featuring a support body, a vibration member with a connected and unconnected portion, and a vibration element connected to the unconnected portion, allowing for bending vibrations with varying amplitudes, where the distance between the vibration element and the connected portion is longer in a perpendicular direction, enabling efficient vibration generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sufficient space is secured between the vibration element and the vibration plate to prevent contact at impact, then reliability is improved, but device size increases
Solution Approach 1:
The patent positions the vibration element such that the distance in the third direction (perpendicular to both first and second directions) is greater than the distance in the second direction. This dimensional arrangement allows sufficient impact protection distance while maintaining a compact overall profile, resolving the contradiction between reliability and device size.
2Length of stationary object
If the vibration element is connected directly to the vibration plate to lower the profile, then device height is reduced, but vibration intensity diminishes
Solution Approach 1:
The patent creates a localized connection structure where only a specific portion (second portion) of the vibration plate is connected to the vibration element, while other portions remain unconnected. This local connection approach maintains low profile height while preserving vibration intensity by allowing optimal vibration transmission at the connected location.
Solution Approach 2:
By arranging the vibration element with greater distance in the third direction compared to the second direction, the patent achieves both low profile height (in the second direction) and effective vibration transmission (through optimized positioning in the third direction), resolving the contradiction between device height and vibration intensity.
3Volume of moving object
If the vibration element is positioned close to the connected portion to reduce space, then device compactness is improved, but vibration transmission efficiency decreases
Solution Approach 1:
The patent optimizes vibration transmission efficiency by positioning the vibration element such that the distance in the third direction is greater than in the second direction. This dimensional optimization allows compact device volume while maintaining effective vibration transmission through proper spatial 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
This design achieves a low-profile vibration device capable of generating strong vibrations, effectively transmitting sound information with clarity, as demonstrated by the portable terminal's ability to produce clear sound without the need for extensive space or vibration intensity reduction.
Implementation Method 1
a vibration element whose one surface in a first direction is connected to one main surface of the second portion in the vibration member, bending vibration of the vibration element in the first direction whose amplitudes vary along a second direction perpendicular to the first direction being caused by electrical signal input
Data Source
AI summary
A low-profile vibration device capable of generation of great vibration and a portable terminal employing the vibration device. The vibration device includes: a support body; a vibration member supported so that its periphery is connected to the support body, the vibration member having a first portion which is connected to the support body, and a second portion which is located inside the first portion and is not connected to the support body; and a vibration element whose one surface in a first direction is connected to one main surface of the second portion in the vibration member, bending vibration of the vibration element in the first direction whose amplitudes vary along a second direction perpendicular to the first direction being caused by electrical signal input.