Speaker Duct with Segmented Internal Space for Bass Discharge
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Solution Overview
Problem
Conventional speakers installed outside a vehicle cabin, such as subwoofers, face challenges in discharging high sound pressure bass range sound with high sound quality due to the limited internal diameter of the cylindrical duct, which restricts the ability to achieve optimal sound reproduction within the vehicle cabin.
Innovation Solution
The speaker design includes a magnetic circuit, voice coil, diaphragm, damper, and a frame with a duct that separates the internal space into two areas, allowing both to communicate with the external space through a large-diameter opening and thick duct, ensuring high sound quality and smooth damper operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a cylindrical duct is provided to discharge reproduced sound from a speaker installed outside the vehicle cabin, then the speaker can communicate with the vehicle cabin interior, but the limited internal diameter of the duct restricts sound quality and prevents high sound pressure bass range sound from being discharged with high quality
Solution Approach 1:
The internal space is divided into a front internal space and a rear internal space by a partition wall, with each space having its own opening that communicates with the external space through the duct. This segmentation allows both spaces to contribute to sound discharge, effectively increasing the total discharge capacity and sound quality while maintaining the same duct structure.
2Manufacturing precision
If the duct internal diameter is increased to improve sound quality, then high sound pressure bass range sound can be discharged with better quality, but the duct structure becomes more complex and larger space is required outside the vehicle cabin
Solution Approach 1:
By dividing the internal space into front and rear spaces with separate openings, the patent achieves improved sound quality through increased effective discharge area without requiring a single large-diameter duct. This maintains the compact external duct structure while enhancing internal sound discharge capability.
3Manufacturing precision
If a large-diameter opening is provided in the frame to improve sound quality, then reproduced sound can be discharged with high quality, but the frame structure becomes more complex and the duct needs to be thicker
Solution Approach 1:
The partition wall creates two separate openings in the frame, allowing the duct to maintain a relatively simple structure with multiple smaller openings rather than requiring a single large-diameter opening. This segmentation reduces the complexity of the frame and duct structure while achieving the same sound quality improvement.
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 enables the discharge of high sound pressure bass range sound with improved sound quality and reduced distortion, making it suitable for automotive subwoofers installed outside the vehicle cabin while maintaining a large space within the cabin.
Implementation Method 1
a voice coil disposed in the magnetic gap and driven by electromagnetic interaction when current is applied to the voice coil
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
In a speaker (1), a space surrounded by a frame (6) on one side of a diaphragm (4) is separated by a damper (5) into a first internal space (S1) and a second internal space (S2). The first internal space (S1) and the second internal space (S2) are caused to face one part and the other part of an opening (6a) provided in the frame (6). A duct (7) is protruded from the frame (6), and the opening (6a) is an open end of the duct (7) on the base end side thereof. The speaker (1) is installed, for example, in a bumper outside a vehicle cabin with the duct inserted into an opening in a vehicle cabin wall, and the first and second internal spaces are caused to communicate with a space (32) in the vehicle cabin through the duct (7). Therefore, reproduced sound in the bass range having a high sound pressure can be discharged through the duct (7) to the space (32) in the vehicle cabin.