Open-Ear Dual Loudspeaker Layout for Frequency Band Sound Pressure
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Solution Overview
Problem
Existing open-ear earphones face challenges in achieving optimal sound pressure within specific frequency bands due to the design of their loudspeakers, which affects audio performance and user safety and comfort by blocking the ear canal.
Innovation Solution
The acoustic output device incorporates a housing with a support structure that positions the device on the ear without blocking the ear canal, featuring dual loudspeakers with spaced magnets and diaphragms, where the second loudspeaker's magnetic axis is inclined or parallel to the first, and sound outlet holes are strategically positioned to enhance sound output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional in-ear or over-ear earphones are used, then sound output can be achieved, but the ear canal is blocked or covered, reducing safety and comfort
Solution Approach 1:
The acoustic output device divides the sound transmission function into two separate loudspeakers: one for music playback and another for environmental sound transmission. This segmentation allows the ear canal to remain open while still achieving effective sound output, resolving the contradiction between sound quality and ear canal blocking.
Solution Approach 2:
The device introduces an intermediary structure (the second loudspeaker dedicated to environmental sound) that mediates between the user and the external environment. This allows users to maintain awareness of surrounding sounds without blocking the ear canal, improving safety while preserving natural sound transmission.
2Device complexity
If a single loudspeaker design is used in open-ear earphones, then structural simplicity is maintained, but sound pressure requirements within specific frequency bands cannot be satisfied
Solution Approach 1:
The audio frequency range is segmented into different bands, with the first loudspeaker handling music playback frequencies and the second loudspeaker handling environmental sound frequencies. This frequency-based segmentation enables each loudspeaker to be optimized for its specific frequency range, achieving superior sound pressure performance across all bands.
Solution Approach 2:
Each loudspeaker is designed with specific local characteristics optimized for its intended function: the first loudspeaker has a diaphragm structure optimized for music playback, while the second loudspeaker has a diaphragm optimized for environmental sound transmission. This local optimization ensures high sound pressure performance in specific frequency bands.
3Object-generated harmful factors
If identical magnetic poles of the first magnet and second magnet are disposed opposite to each other, then magnetic field interference is reduced, but device complexity increases
Solution Approach 1:
The device employs asymmetric magnet arrangement where identical magnetic poles are positioned opposite each other between the two loudspeakers. This asymmetric configuration effectively reduces magnetic field interference while maintaining a compact overall structure, resolving the contradiction between interference reduction and structural simplicity.
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 allows for improved sound output distribution, ensuring user safety and comfort by maintaining ear canal openness, enhancing audio performance across frequency bands, and reducing the risk of traffic accidents by allowing environmental sound awareness.
Implementation Method 1
the first loudspeaker includes a first magnet and a first diaphragm, the first magnet and the first diaphragm are spaced apart along a vibration direction of the first diaphragm; and the second loudspeaker includes a second magnet and a second diaphragm
Data Source
AI summary
One or more embodiments of the present disclosure relate to an acoustic output device. The acoustic output device includes a housing, a support structure, a first loudspeaker, and a second loudspeaker. The housing forms an inner cavity; the support structure is configured to wear the housing on an ear without blocking an ear canal. The first loudspeaker is accommodated within the inner cavity, and the first loudspeaker includes a first magnet and a first diaphragm. The first magnet and the first diaphragm are spaced apart along a vibration direction of the first diaphragm. The second loudspeaker is accommodated within the inner cavity, and the second loudspeaker includes a second magnet and a second diaphragm. The second magnet and the second diaphragm are spaced apart along a vibration direction of the second diaphragm.