Flat Panel Speaker Trim Integration with Damped Exciter Bracket
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Solution Overview
Problem
Traditional cone-shaped loudspeakers occupy valuable space in vehicle interiors, and integrating flat panel speakers into trim panels is challenging due to shape and mounting limitations, leading to reduced sound quality and efficiency, as well as sound absorption by typical trim materials.
Innovation Solution
A trim panel assembly with a speaker aperture and a diaphragm panel connected by a flexible surround, where the exciter is supported by a bracket spanning the aperture, allowing for improved damping and reduced vibration propagation to other components, enhancing sound reproduction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the exciter is mounted directly to the backside of the trim panel substrate, then the integration is simplified and costs are reduced, but the sound production area extends to other assembled components which adversely affects resonance and sound reproduction quality
Solution Approach 1:
The patent segments the mounting structure by introducing a separate bracket that is distinct from both the exciter and the trim panel. This bracket acts as an independent intermediate component that divides the mounting function, allowing the exciter to be supported without direct contact with the trim panel substrate, thereby isolating sound vibrations from interfering components.
Solution Approach 2:
The bracket serves as an intermediary element between the exciter and the trim panel substrate. It mediates the mechanical connection while providing vibration isolation through damping material, preventing direct transmission of unwanted vibrations to the trim panel and other assembled components.
2Device complexity
If the exciter is solely supported by attachment with the panel surface, then the integration is straightforward, but the exciter must overcome its own mass which limits voice coil excursion and sound transmission efficiency
Solution Approach 1:
The support function is segmented between the bracket and the trim panel substrate. The bracket provides primary structural support for the exciter, bearing its weight, while the trim panel substrate provides secondary support. This segmentation allows the exciter to be supported without relying solely on its attachment to the panel surface, improving power efficiency.
Solution Approach 2:
The bracket acts as an intermediary support structure that bears the weight of the exciter, reducing the load on the attachment points to the trim panel substrate. This intermediary support improves voice coil excursion and sound transmission efficiency by reducing the effective mass the exciter must overcome.
3Reliability
If traditional cone-shaped loudspeakers are used, then adequate sound quality is achieved, but valuable space in the vehicle interior is occupied
Solution Approach 1:
The patent transitions from traditional three-dimensional cone-shaped speakers to two-dimensional flat panel speakers. This dimensional change allows the speaker to be integrated into the trim panel surface without protruding into the vehicle interior, preserving valuable space while maintaining sound quality through the flat panel design.
Solution Approach 2:
The flat panel speaker is merged with the trim panel structure, combining the functions of interior decoration and sound reproduction in a single integrated component. This eliminates the need for separate speaker housings and mounting structures, maximizing interior space utilization.
4Shape
If typical trim materials such as glass-filled urethane foam and molded plastics are used for the sound surface, then aesthetic appearance is achieved, but the materials are sound absorbent and far from ideal for propagating sound
Solution Approach 1:
The patent segments the trim panel structure into distinct functional zones: a decorative face portion that provides aesthetic appearance and a separate diaphragm portion that provides sound propagation capability. This segmentation allows each portion to be optimized for its specific function without compromise.
Solution Approach 2:
Different portions of the trim panel are assigned different material properties and functions. The face portion uses typical aesthetic trim materials for appearance, while the diaphragm portion uses materials optimized for sound propagation. This local differentiation of quality allows both aesthetic and acoustic requirements to be satisfied.
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 solution allows for efficient sound production by supporting the exciter's weight and confining vibrations to the diaphragm panel, improving sound quality and adaptability on various panel sizes and shapes while maintaining aesthetic appeal.
Implementation Method 1
so that the diaphragm panel is movable along an axis of the speaker aperture and so that vibrations from the diaphragm panel to the trim panel are damped
Implementation Method 2
so that vibrations from the diaphragm panel to the trim panel are damped
Data Source
AI summary
A trim panel assembly for a vehicle incorporates a flat panel speaker. The trim panel defines an interior surface of a passenger compartment of the vehicle and has a speaker aperture with a peripheral edge. A diaphragm panel is disposed in the speaker aperture with a trim face and a rear face. A flexible surround joins the diaphragm panel to the aperture edge so that the diaphragm panel is movable along an axis of the speaker aperture and so that vibrations from the diaphragm panel to the trim panel are damped. An exciter receives audio signals for reproduction. The exciter has an actuator suspended in a housing. The actuator is fixed to the rear face of the diaphragm panel. A support bracket spans the speaker aperture and has first and second ends affixed to a rear side of the trim panel and an intermediate point affixed to the housing of the exciter.