Vibrating Diaphragm Sputtering for Polarization Suppression

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Solution Overview

Problem

Conventional vibrating diaphragm designs in telephone receivers fail to simultaneously achieve low frequency acoustic quality and suppress system polarization as the size of receivers decreases, leading to increased distortion and clutter.

Innovation Solution

The method involves surface sputtering of the corrugated rim and dome portions of the vibrating diaphragm using magnetron sputtering technology to enhance local rigidity and strength, respectively, without compromising low frequency performance, employing iron powder or liquid gel mixed with iron powder as sputtering materials to control polarization and distortion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the vibrating diaphragm is designed to be softer to meet low frequency acoustic quality requirements, then low frequency acoustic quality is improved, but system polarization is aggravated and distortion control becomes more difficult

Engineering Contradiction:

Improvelow frequency acoustic qualityVSAvoidsystem polarization

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent applies different material properties to different regions of the vibrating diaphragm. The corrugated rim portion is treated with surface sputtering to increase local rigidity and suppress polarization, while the dome portion maintains its original soft characteristics to preserve low frequency acoustic quality. This local differentiation allows simultaneous optimization of both low frequency response and system stability.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent creates a composite structure by combining the untreated soft diaphragm material with the sputtered rigid coating on the corrugated rim portion. This composite approach allows the diaphragm to exhibit both soft characteristics (for low frequency quality) and rigid characteristics (for polarization suppression) in different regions, resolving the contradiction between these opposing requirements.

Inventive Principle:

Principle #40Composite materials

2Volume of moving object

If the size of telephone receivers is decreased, then device compactness is improved, but the conventional vibrating diaphragm design cannot simultaneously meet low frequency acoustic quality and suppress system polarization

Engineering Contradiction:

Improvereceiver sizeVSAvoidacoustic quality and polarization suppression

Core Design Contradiction:

Volume of moving objectVSReliability

Solution Approach 1:

In miniaturized receivers, the patent selectively applies surface sputtering treatment to specific regions (corrugated rim portion) rather than the entire diaphragm. This localized treatment allows the compact diaphragm to maintain soft characteristics overall for low frequency quality while having rigid reinforced zones for polarization suppression, enabling both small size and high performance.

Inventive Principle:

Principle #3Local quality

3Stability of the object's composition

If surface sputtering is performed on the corrugated rim portion to enhance rigidity and suppress polarization, then system polarization is suppressed, but the low frequency acoustic quality may be influenced

Engineering Contradiction:

Improvesystem polarization suppressionVSAvoidlow frequency acoustic quality

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

The patent carefully controls the sputtering process to treat only the corrugated rim portion and not the dome portion or other critical areas. By limiting the treatment to the rim region, the patent achieves polarization suppression through increased local rigidity while preserving the soft, compliant characteristics of the main diaphragm surface that are essential for low frequency acoustic quality.

Inventive Principle:

Principle #3Local quality

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 approach increases the support force of the corrugated rim and strengthens the dome portion with minimal weight increase, effectively suppressing system polarization and improving high frequency response and reducing harmonic distortion in telephone receivers.

Implementation Method 1

performing surface sputtering on part of an area of the corrugated rim portion by using a magnetron sputtering technology

Methodology Applied

Scientific EffectMagnetron sputtering: Sputtering

Data Source

PatentUS10299043B2Method for reprocessing vibrating diaphragm, vibrating diaphragm and telephone receiver

Publication Date: 2019.05.21 GOERTEK INC

AI summary

The present application discloses a method for reprocessing a vibrating diaphragm, a vibrating diaphragm and a telephone receiver. The method for reprocessing a vibrating diaphragm involves the use of a vibrating diaphragm that includes a plane portion located at a center, a corrugated rim portion disposed at an edge of the plane portion, and a fixing portion connected to a periphery of the corrugated rim portion to bond a housing. The method includes, but is not limited to performing surface sputtering on part of an area of the corrugated rim portion by using a magnetron sputtering technology.