Panel Loudspeaker Magnet Grounding Assembly
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Solution Overview
Problem
Conventional panel audio loudspeakers integrated into electronic devices like mobile phones cause excessive vibration, affecting user experience and external environments due to inertially driven mechanisms.
Innovation Solution
A grounding assembly is introduced between the actuator and the device chassis, utilizing compliant elements such as foam, rubber, or springs to mechanically ground the magnet, reducing unwanted vibrations without degrading sound output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an electromagnetic actuator is used to drive the panel audio loudspeaker, then sound output is achieved, but excessive vibration is generated affecting user experience and external environments
Solution Approach 1:
A grounding assembly with compliant elements is introduced as an intermediary between the electromagnetic actuator and the device chassis. This intermediary mechanically grounds the magnet to the chassis while allowing controlled movement, thereby dissipating vibrational energy and reducing unwanted device vibration without compromising sound output capability
Solution Approach 2:
The grounding assembly converts the harmful vibrational energy into beneficial controlled movement through the compliant elements. The compliant elements allow the magnet to move in a controlled manner, transforming the excessive vibration into manageable mechanical motion that maintains audio performance while reducing harmful vibrations affecting the device and external environment
2Object-affected harmful factors
If a grounding assembly is added to reduce vibration, then device vibration is reduced, but device complexity increases
Solution Approach 1:
The grounding assembly utilizes compliant elements such as flexible materials (foam, rubber, silicone, or spring structures) to mechanically ground the magnet to the chassis. These flexible elements provide vibration reduction functionality while maintaining a compact and relatively simple structural form factor, avoiding excessive complexity in the device design
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 mitigates device vibration while maintaining sound pressure levels, reducing unwanted vibration by factors of fifty at low frequencies and twenty at mid-range frequencies compared to conventional loudspeakers without grounding assemblies.
Implementation Method 1
an electromagnetic actuator mechanically coupled to a rear side of the panel... the electromagnetic actuator including a coil attached to the rear side of the panel and a magnet
Implementation Method 2
a magnet suspended with respect to the coil via one or more spring elements
Implementation Method 3
a grounding assembly positioned along the axis between the magnet and the rear panel of the device. The grounding assembly mechanically grounds the magnet to the chassis... The compliant element is selected from the group consisting of: a piece of foam, a piece of rubber, a piece of silicone, a three-dimensional polymer structure, a spring
Data Source
AI summary
A device includes: a panel and an electromagnetic actuator mechanically coupled to a rear side of the panel to form a panel audio loudspeaker, the electromagnetic actuator comprising a coil attached to the rear side of the panel and a magnet suspended with respect to the coil via one or more spring elements, the coil defining an axis, wherein during operation of the device an electric current through the coil varies a relative displacement of the magnet with respect to the coil along the axis. The device includes: a chassis supporting the panel, the chassis comprising a housing for the device, the housing comprising a rear panel on an opposite side of the device from the panel; and a grounding assembly positioned along the axis between the magnet and the rear panel of the device, wherein the grounding assembly mechanically grounds the magnet to the chassis.