Speaker Fin Unit Bass Reproduction Depth Constraint
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Solution Overview
Problem
In overhead-type headphone devices with open-backed speaker units, increasing bass reproduction volume is challenging without elongating the depth of the housing, which complicates design and fitting.
Innovation Solution
Incorporating a fin unit with annular or arc-like fins within the back cavity of the speaker unit, which expands in diameter towards the rear, forming a back cavity that enhances sound propagation without increasing the housing depth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the depth of the housing portions is elongated to increase bass reproduction volume, then the bass reproduction volume increases, but the design complexity increases and fitting property to ears deteriorates
Solution Approach 1:
The patent introduces a fin unit with fins extending in the depth direction of the back cavity, transforming the problem from a one-dimensional depth extension to a multi-dimensional solution. The fins create extended sound propagation paths within the existing housing depth, effectively adding acoustic dimensionality without increasing physical housing depth, thereby resolving the contradiction between bass volume and housing compactness.
Solution Approach 2:
The fin unit is nested within the existing back cavity of the housing, with fins arranged concentrically or radially within the limited space. This nesting approach allows the fin structure to occupy and utilize the available depth space efficiently, creating extended acoustic paths without requiring additional housing depth, thus maintaining compact design while improving bass reproduction.
2Productivity
If the depth of the housing portions is elongated to increase bass reproduction volume, then the bass reproduction volume increases, but the fitting property to ears deteriorates
Solution Approach 1:
By introducing the fin unit with vertically extending fins within the back cavity, the patent creates extended sound propagation paths in the depth dimension without increasing the overall housing depth. This allows improved bass reproduction while maintaining the compact external dimensions required for comfortable ear fitting.
3Device complexity
If the housing depth is kept short for design simplicity, then the design and fitting property are maintained, but the bass reproduction volume decreases
Solution Approach 1:
The fin unit is nested within the existing back cavity space, with multiple fins arranged to create extended acoustic paths without increasing the external housing dimensions. This nested configuration allows the compact housing to achieve enhanced bass reproduction through the internal fin structure, resolving the contradiction between short housing depth and bass volume.
Solution Approach 2:
The fin structure introduces vertical dimensionality within the back cavity, creating extended sound propagation paths in the depth direction without increasing the overall housing depth. This dimensional transformation enables improved bass reproduction while maintaining the short housing depth required for simple design and good fitting property.
4Productivity
If a fin unit is added to extend sound propagation paths, then bass reproduction volume increases, but the device complexity increases
Solution Approach 1:
The fin unit is nested within the existing back cavity, utilizing the available space efficiently. The fins are arranged concentrically or radially within the limited depth space, creating extended acoustic paths without requiring additional housing volume. This nested configuration minimizes structural complexity while achieving improved bass reproduction.
Solution Approach 2:
The fin unit divides the back cavity into multiple regions using individual fins, creating segmented sound propagation paths. Each fin acts as an independent element that extends the acoustic path, and the segmented structure allows for modular manufacturing and assembly, reducing overall device complexity while improving bass volume.
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 increases bass reproduction volume without elongating the housing depth, providing improved sound pressure in the bass range and reducing distortion by extending sound propagation paths and minimizing reflected noise.
Implementation Method 1
a fin unit, which is disposed in the back cavity, and includes an annular or arc-like first fin expanding in diameter, so as to approach a rear side of the housing as going from a center of the speaker unit toward an outer diameter side of the speaker unit
Data Source
AI summary
A speaker includes: an open-backed speaker unit, a housing, and a fin unit. The housing is disposed so as to cover a rear side of the speaker unit, and forms a back cavity with the speaker unit. The fin unit is disposed in the back cavity, and includes an annular or arc-like fin, which approaches a rear side of the housing as going from a center of the speaker unit toward an outer diameter side thereof, and expands in diameter as separating from the speaker unit.