Speaker Module Magnetic Substrate Noise Shielding
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Solution Overview
Problem
In high-density mounting configurations for mobile terminal apparatuses, speaker modules are affected by noise emitted from DC-DC converter devices, limiting the flexibility and efficiency of component arrangement.
Innovation Solution
A speaker module configuration that includes a DC-DC converter device with a switching circuit and choke coil, where a magnetic substrate with the choke coil is positioned between the switching circuit and the speaker device, acting as an electromagnetic shield to reduce noise, allowing for closer placement and high-density mounting while maintaining sound quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the speaker device and DC-DC converter device are placed close to each other for high-density mounting, then the mounting density increases, but noise interference from the DC-DC converter affects the speaker device
Solution Approach 1:
A magnetic substrate is introduced as an intermediary component between the DC-DC converter device and the speaker device. This magnetic substrate serves as an electromagnetic shield that blocks noise radiation from the DC-DC converter while allowing the two devices to be placed in close proximity for high-density mounting.
Solution Approach 2:
The magnetic substrate, which inherently has electromagnetic shielding properties, is utilized to convert the harmful noise radiation from the DC-DC converter into a beneficial shielding effect. The magnetic material absorbs or redirects electromagnetic noise, protecting the speaker device while enabling compact arrangement.
2Object-affected harmful factors
If electromagnetic shielding is added to reduce noise, then noise interference decreases, but the device complexity and space occupation increase
Solution Approach 1:
The magnetic substrate performs multiple functions simultaneously: it serves as the base substrate for mounting the DC-DC converter device, provides electromagnetic shielding to block noise, and acts as a structural support for the entire speaker module. This multi-functionality reduces the need for separate shielding components.
Solution Approach 2:
The electromagnetic shielding function is merged with the substrate function. Instead of adding a separate shielding layer or component, the magnetic substrate itself is designed to provide both mechanical support and electromagnetic protection, combining multiple functions into a single component.
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 configuration reduces noise interference, enables closer placement of speaker and DC-DC converter devices, achieving high-density mounting and improved sound quality while maintaining space efficiency.
Implementation Method 1
the magnetic substrate defines and functions as an electromagnetic shield, it is possible to reduce or prevent the noise emitted from the choke coil, the switching circuit device
Implementation Method 2
a speaker device that converts an electric signal generated using output voltage from the DC-DC converter device into sound
Data Source
AI summary
A speaker module includes a DC-DC converter device including a switching circuit device and a choke coil connected to the switching circuit device and a speaker device that converts an electric signal generated using output voltage from the DC-DC converter device into sound. A magnetic substrate which includes the choke coil and on which the switching circuit device is mounted is disposed between the switching circuit device and the speaker device.