Speaker Casing with Integrated Conductors via LDS
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Solution Overview
Problem
Traditional speaker coil connectivity in mobile communications devices, such as smartphones, involves complex assembly processes and additional materials costs, particularly with flexible printed circuits (FPC) or insert metal, which can be costly and unreliable, and limits design flexibility.
Innovation Solution
The use of Laser Direct Structuring (LDS) technology to integrate electrical conductors directly onto the speaker box, allowing for flexible 3D design and eliminating the need for additional connectivity materials, while also enabling the formation of both speaker conductors and antenna patterns in a single process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional FPC or insert metal methods are used for speaker coil connectivity, then electrical connection is achieved, but assembly complexity increases and additional material costs are incurred
Solution Approach 1:
The patent merges the speaker box structure with the electrical conductor into a single integrated component. The conductor is formed directly within the speaker box cavity using LDS technology, eliminating the need for separate FPC or insert metal components. This integration reduces assembly steps and complexity while maintaining reliable electrical connection for the speaker coil.
Solution Approach 2:
The speaker box is designed to serve multiple functions: it provides structural enclosure, defines the acoustic cavity volume, and simultaneously acts as the electrical conductor for speaker coil connectivity. This multi-functionality eliminates the need for dedicated connectivity components, reducing both material costs and assembly complexity.
2Reliability
If FPC or insert metal are used for connectivity, then electrical connection is established, but material costs increase
Solution Approach 1:
The speaker box and electrical conductor are merged into a single integrated component. The conductor material is deposited directly onto the speaker box surface or within its cavity using LDS technology, eliminating the need for separate FPC or insert metal materials. This reduces material costs while maintaining reliable electrical connection.
Solution Approach 2:
The speaker box structure itself serves as the electrical conductor, eliminating the need for additional connectivity materials. The LDS process enables the speaker box to provide its own electrical connection function, reducing material requirements and costs.
3Ease of manufacture
If traditional connectivity methods are used, then speaker connection is achieved, but design flexibility is limited
Solution Approach 1:
The LDS technology enables flexible modification of conductor geometry and position by changing laser processing parameters. The conductor can be formed in complex 3D configurations within the speaker box cavity, allowing greater design flexibility for different speaker coil arrangements and device form factors while maintaining ease of manufacture through a single integrated process.
4Reliability
If separate connectivity materials like FPC are used, then electrical connection is provided, but the number of components and assembly steps increases
Solution Approach 1:
The speaker box and electrical conductor are merged into a single integrated component, eliminating the need for separate FPC or insert metal components. This integration reduces the total number of parts and assembly steps, improving productivity while maintaining reliable electrical connection for the speaker coil.
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 simplifies the connectivity process, reduces costs, enhances antenna performance by over 1.5dB, and allows for more flexible design curves, eliminating the need for separate connectivity materials like FPC, thereby improving both speaker and antenna functionality.
Implementation Method 1
Laser Direct Structuring (LDS) is known which uses a thermoplastic material, doped with a metal-plastic additive, where the additive is activated by means of a laser. The basic component is single-component injection molded, with practically no restrictions in terms of 3D design freedom. A laser then writes the course of the later circuit trace on the plastic. Where the laser beam hits the plastic the metal additive forms a micro-rough track.
Implementation Method 2
The metal particles of this track form the nuclei for the subsequent metallization. In an electroless copper bath the conductor path layers arise precisely on these tracks.
Data Source
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AI summary
An apparatus including a sound transducer; a casing member, where the sound transducer is mounted to the casing member, and where the casing member is configured to at least partially form an enclosure for the sound transducer; and electrical conductors integrally formed with the casing member. The electrical conductors are electrically connected to the sound transducer. The electrical conductors are configured to provide electrical connectivity for the sound transducer, where at least one of the electrical conductors is configured to couple to an antenna pattern to form part of an antenna arrangement.