Coaxial Transducers in Open-Back Earcups
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Solution Overview
Problem
Electroacoustic earcups for open-back headphones often exhibit less than accurate sound response, particularly with pulse signals, due to long acceleration and deceleration times of the vibrating diaphragm, leading to an unpleasant listening experience.
Innovation Solution
The design incorporates a pair of electroacoustic transducers arranged coaxially within the hollow housing, with a hermetically connected isobaric chamber between them, which reduces acceleration and deceleration times by synchronizing the movement of the vibrating diaphragms and enhancing magnetic flux control, while maintaining air permeability through the earpad and cover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single electroacoustic transducer is used in open-back headphones, then the structure is simple and air permeability is maintained, but the acceleration and deceleration times of the vibrating diaphragm are too long, resulting in inaccurate sound response
Solution Approach 1:
The single transducer is segmented into two electroacoustic transducers (first and second transducers) that operate in conjunction. Each transducer has its own vibrating diaphragm (first and second diaphragms) that work together to reduce acceleration and deceleration times, thereby improving sound response accuracy while maintaining the open-back design.
Solution Approach 2:
The two electroacoustic transducers are merged into a coordinated system where the first and second diaphragms move in synchronization. This combination allows the system to achieve faster acceleration and deceleration times than a single transducer could provide alone, resolving the speed limitation while maintaining structural simplicity.
2Object-generated harmful factors
If the vibrating diaphragm moves slowly in free air within the hollow housing, then air permeability is maintained for natural sound perception, but the acceleration and deceleration times become too long for high fidelity audio reproduction
Solution Approach 1:
The system segments the acoustic output into two coordinated diaphragms that work together. This segmentation allows each diaphragm to contribute to the overall sound production, enabling faster response times and reduced distortion while maintaining the air-permeable open-back design for natural sound perception.
Solution Approach 2:
The invention changes the operational parameters by introducing a second transducer that synchronizes with the first. This parameter change (adding a second operating element) enables the system to achieve faster acceleration and deceleration times, improving audio reproduction accuracy without compromising the air permeability characteristic.
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 improves sound reproduction by reducing diaphragm movement times and minimizing distortions, resulting in enhanced audio fidelity and a more natural listening experience.
Implementation Method 1
Each electroacoustic transducer comprises a vibrating diaphragm (10a, 10b) that faces the first opening (30) of the hollow housing (2) and is adapted to convert an input electrical signal into an output acoustic signal
Implementation Method 2
The electroacoustic transducers (8a, 8b) are hermetically connected by an isobaric chamber (12) arranged between the two electroacoustic transducers (8a, 8b) in the main direction (A)
Data Source
AI summary
An electroacoustic earcup for open-back headphones may include: a housing extending in a main direction, wherein the housing includes a first wall with a first opening and a second wall with a second opening, wherein the first and second walls are transverse to the main direction and are connected by a side wall; an air-permeable earpad whose shape mates with that of a human ear, wherein the air-permeable earpad is operably connected in fluid communication with the first opening; an air-permeable cover which is operably connected in fluid communication with the second opening; and a first electroacoustic transducer and a second electroacoustic transducer in the housing, one behind the other in the main direction. Each of the first and second electroacoustic transducers may include a diaphragm, configured to vibrate, facing the first opening. Each of the first and second electroacoustic transducers may define an input surface facing the second opening.