Headphone Baffle Plate Hexagonal Cells Standing Wave Suppression
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Solution Overview
Problem
Headphones face challenges in suppressing standing waves generated in enclosed spaces surrounding the baffle plate and housing, leading to sound quality deterioration and increased costs due to the need for sound-absorbing materials.
Innovation Solution
The headphone design incorporates a baffle plate with cells of regular hexagonal prism shape, featuring holes that function as Helmholtz resonators to target and reduce standing waves, eliminating the need for additional sound-absorbing materials and allowing adjustment of the low-frequency band without extra components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If sound-absorbing materials are added to suppress standing waves, then standing wave suppression is improved, but device complexity and cost increase
Solution Approach 1:
The baffle plate itself is designed with cell structures that act as acoustic resonators, allowing the component to suppress standing waves through its own structure without requiring additional sound-absorbing materials. The cells are formed directly in the baffle plate during manufacturing, creating a self-contained solution that eliminates the need for separate acoustic treatment components.
Solution Approach 2:
The patent changes the physical parameters of the baffle plate by introducing cell structures with specific geometries (different shapes, sizes, and distributions). These parameter changes enable the baffle plate to function as an acoustic resonator system that targets specific standing wave frequencies, transforming the baffle plate from a simple support structure into an active acoustic control element.
2Object-affected harmful factors
If sound-absorbing materials are added to suppress standing waves, then standing wave suppression is improved, but cost increases
Solution Approach 1:
The patent merges the standing wave suppression function into the baffle plate structure itself by forming cell structures within the baffle plate. This consolidation eliminates the need for separate sound-absorbing materials and their associated manufacturing steps, reducing overall production cost while maintaining the acoustic suppression function.
Solution Approach 2:
The baffle plate is designed to perform dual functions: structural support and acoustic wave suppression. By making the baffle plate self-sufficient for both functions through integrated cell structures, the patent eliminates the need for additional components and reduces manufacturing complexity and cost.
3Object-affected harmful factors
If the baffle plate structure is modified to add cells, then standing wave suppression is improved, but rigidity may be affected
Solution Approach 1:
The cell structures are strategically positioned in specific regions of the baffle plate where they are most effective for standing wave suppression, rather than uniformly distributing them throughout. This localized approach allows the baffle plate to maintain rigidity in critical areas while incorporating acoustic control features where they provide maximum benefit.
Solution Approach 2:
The baffle plate is designed as a composite structure combining solid material regions for structural strength and cell structures for acoustic control. This composite approach allows the plate to simultaneously achieve the necessary mechanical rigidity and acoustic wave suppression performance.
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 design effectively suppresses standing waves, enhances sound quality, reduces costs, and allows for weight reduction while maintaining necessary rigidity by using the baffle plate's cells to manage sound pressure and frequency characteristics.
Implementation Method 1
a part of the at least one cell has a hole communicated with the cavity... the at least one cell has a hexagonal prism shape
Data Source
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AI summary
A headphone include a speaker unit, a baffle plate, and an ear pad. The baffle plate supports the speaker unit. The ear pad is attached to a front surface of the baffle plate. The baffle plate has at least one cell having a cavity. A part of the at least one cell has a hole communicated with the cavity. The hole is provided in at least one of the front surface of the baffle plate and a back surface of the baffle plate opposite to the front surface.