Vibration Device Rear Cover Sound Quality Thickness
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Solution Overview
Problem
Existing apparatuses for outputting sound, such as those using speakers or piezoelectric devices, face challenges including limited design flexibility due to space occupancy, fragility of piezoelectric devices leading to low reliability in sound reproduction, and damage from external impacts.
Innovation Solution
The development of a vibration device and apparatus that includes a vibration member, a rear cover, a first vibration device at a first rear region of the rear cover, and a second vibration device at a second rear region of the rear cover. This configuration enhances sound quality and sound pressure level characteristics while being robust against external impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a speaker or piezoelectric device is applied to output sound, then sound reproduction function is achieved, but the apparatus thickness increases or the device becomes fragile
Solution Approach 1:
The patent combines the display panel and vibration plate into a single integrated structure. The display panel serves dual functions as both the visual display component and the sound-generating vibration plate, eliminating the need for separate speaker components and reducing overall apparatus thickness while maintaining sound reproduction capability
Solution Approach 2:
The patent replaces traditional electromagnetic speaker actuators with piezoelectric devices that convert electrical signals directly into mechanical vibrations of the display panel. This substitution enables thinner design while achieving effective sound output through the panel's vibration
2Length of moving object
If a piezoelectric device is applied to reduce thickness, then thin profile is achieved, but the device becomes easily damaged by external impact
Solution Approach 1:
The patent positions multiple vibration devices at different locations on the rear cover to create a distributed support system. This arrangement provides beforehand cushioning by spreading the mechanical stress and impact forces across multiple points, protecting the piezoelectric elements from concentrated damage while maintaining thin profile
Solution Approach 2:
The patent utilizes the display panel itself as a flexible vibration membrane that can withstand external impacts. The panel's inherent flexibility and distributed structure provide protection to the embedded piezoelectric devices while maintaining the thin design requirement
3Device complexity
If a single vibration device is used, then device complexity is reduced, but sound quality and sound pressure level are insufficient
Solution Approach 1:
The patent divides the sound generation function into multiple segmented vibration devices positioned at different locations on the rear cover. Each device handles specific frequency ranges or spatial zones, and their combined operation produces superior sound quality and pressure level while maintaining relatively simple individual device structures
Solution Approach 2:
The patent applies vibration devices with different characteristics to different locations on the rear cover. Each location receives a vibration device optimized for its specific position and function, creating local quality variations that collectively enhance overall sound performance without requiring complex individual devices
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 proposed solution effectively enhances sound quality and sound pressure level characteristics, improves the robustness of the apparatus against external impacts, and maintains a thin profile, addressing the limitations of existing technologies.
Implementation Method 1
a vibration device at a first rear region of the rear cover, and a second vibration device at a second rear region of the rear cover... vibrate the rear cover to generate sound
Implementation Method 2
piezoelectric devices which enable a thin thickness to be implemented... a second vibration device at a second rear region of the rear cover
Data Source
Figure 1~2A
Figure 2B~2C
Figure 3~4
AI summary
An apparatus comprises a vibration member, a rear cover at a rear surface of the vibration member, a first vibration device at a first rear region of the rear cover, and a second vibration device at a second rear region of the rear cover.