Dustproof Plate Reinforcement for Speaker Rattle Suppression
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Solution Overview
Problem
Conventional portable telephones with dustproof nets experience rattle sounds due to air flow and vibration, especially with large output speakers, which complicates the mold structure when trying to suppress these noises.
Innovation Solution
A dustproof plate is created by attaching a reinforcing sheet made of synthetic resin with multiple openings to the dustproof net, providing increased rigidity and reducing vibration, allowing easy attachment without altering the cabinet structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a dustproof net is used to prevent dust from entering the speaker, then dust protection is improved, but the dustproof net vibrates due to air flow resistance and causes rattle sound
Solution Approach 1:
The invention uses a composite structure consisting of a dustproof net and a reinforcing plate. The dustproof net provides dust protection while the rigid reinforcing plate suppresses vibration and rattle sound. The combination of these two materials with different properties (flexible net and rigid plate) resolves the contradiction between dust protection and noise generation.
2Object-generated harmful factors
If a projection is formed on the cabinet to push up the dustproof net and suppress rattle sound, then rattle sound is reduced, but the mold structure becomes complicated
Solution Approach 1:
The invention extracts the vibration suppression function from the cabinet structure and relocates it to a separate reinforcing plate component. Instead of modifying the cabinet with projections, the reinforcing plate is attached to the dustproof net to provide the necessary support and suppress rattle sound, thereby simplifying the mold structure.
3Object-affected harmful factors
If the dustproof net is attached in close contact with the cabinet inner face, then dust protection is improved, but the dustproof net clashes against the cabinet and causes rattle sound
Solution Approach 1:
The invention attaches a rigid reinforcing plate to the dustproof net to create a composite structure. This composite dustproof plate maintains close contact with the cabinet for dust protection while the rigid plate prevents the net from flexing and clashing against the cabinet, thereby eliminating rattle sound.
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 effectively suppresses rattle sounds by stabilizing the dustproof plate, ensuring sound wave transmission without compromising output characteristics, and simplifies the construction process.
Implementation Method 1
the dustproof net vibrates as air enters and exits therethrough, and repeats clashes against the front face of the speaker, to thereby cause a problem of occurrence of rattle sound
Implementation Method 2
The reinforcing sheet 52 has a plurality of openings 54 formed for passing through sound waves from the speaker 4
Data Source
AI summary
A portable electronic device of the present invention includes a cabinet and a speaker placed inside the cabinet. The cabinet has one or more sound radiating holes in an area opposed to a front face of the speaker. A dustproof plate formed by attaching a dustproof net and a reinforcing sheet to each other is placed on the front face of the speaker or an inner face of the cabinet opposed to the front face. The reinforcing sheet has a plurality of openings formed for passing through sound waves from the speaker.