Force Balanced Acoustic Transducer Vibration Cancellation
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Solution Overview
Problem
There is a growing need for audio transducers that can provide high-quality audio performance, especially in bass frequencies, while maintaining a thin profile and minimizing mechanical vibrations, which often compromise audio performance in compact devices.
Innovation Solution
The development of a force-balanced acoustic transducer design that utilizes two diaphragms vibrating in equal and opposite directions to cancel reaction forces, reducing mechanical vibrations and enhancing audio output quality, with a magnetic circuit structure that optimizes magnetic flux and minimizes base thickness for improved efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the height of audio transducers is reduced to create thin-profile devices, then the form factor is improved and devices become more compact, but bass performance and audio output quality deteriorate
Solution Approach 1:
The patent employs a force-cancelling mechanism where a first audio transducer and a second audio transducer are positioned to generate equal and opposite reaction forces. The second transducer acts as a counterweight that cancels the mechanical vibrations and reaction forces generated by the first transducer, enabling thin-profile design while maintaining bass performance through active vibration cancellation rather than passive mass addition.
Solution Approach 2:
The audio system is segmented into multiple independent transducer units (first audio transducer and second audio transducer) that can be individually controlled. This segmentation allows each transducer to be optimized for specific functions - one for primary audio output and the other specifically for vibration cancellation - enabling the thin-profile design to achieve bass performance through coordinated operation of separate components rather than relying on a single large transducer.
2Reliability
If audio transducers operate in bass frequency ranges, then audio output quality is improved, but mechanical vibrations increase causing distortions and energy loss
Solution Approach 1:
The patent converts the harmful mechanical vibrations and reaction forces generated by bass-frequency audio transducers into a beneficial cancellation mechanism. By positioning a second transducer to generate equal and opposite forces, the harmful vibrations from the first transducer are transformed into a controlled counteracting force that eliminates distortions and prevents energy loss to the enclosure, turning a detrimental effect into a performance-enhancing feature.
Solution Approach 2:
The system implements preliminary anti-action by using the second audio transducer to preemptively counteract the reaction forces and mechanical vibrations generated by the first transducer before they can propagate to the enclosure and cause distortions. This proactive vibration cancellation occurs simultaneously with the primary audio output, preventing harmful effects rather than addressing them afterward.
3Weight of moving object
If lightweight plastic materials are used in consumer devices, then device weight is reduced and manufacturing is simplified, but bass performance is compromised due to energy loss from mechanical vibrations
Solution Approach 1:
The force-cancelling transducer system provides a solution that works independently of the enclosure material weight. By using active vibration cancellation through the second audio transducer, the system compensates for the lack of mass in lightweight plastic enclosures, allowing thin-profile devices with plastic housings to achieve proper bass performance without relying on heavy materials for vibration suppression.
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 solution achieves improved audio output quality, reduced audible distortions, and enhanced stability in compact devices by canceling mechanical vibrations, thereby addressing the challenges of bass performance and vibration-induced issues in thin-profile audio systems.
Implementation Method 1
a first audio transducer and a second audio transducer for the generation of equal and opposite reaction forces
Implementation Method 2
a magnetic circuit structure that optimizes magnetic flux and minimizes base thickness for improved efficiency
Data Source
AI summary
An acoustic transducer comprising a plurality of acoustic diaphragms configured to vibrate in opposing directions in response to a received electrical signal, a frame assembly coupled to a first diaphragm and a second diaphragm of the plurality of acoustic diaphragms, a plurality of suspension elements coupled to the plurality of acoustic diaphragms, the plurality of suspension elements comprising at least two primary-suspension-elements and at least two secondary-suspension-elements, and a magnet assembly fixedly positioned within the frame assembly including a housing, at least two magnets, a first pole piece mounted on a first of the at least two magnets and a second pole piece mounted on a second of the at least two magnets, the housing having at least a first region for placement of a first magnet and a first vertical portion having a vertical height greater than a vertical height of the first magnet or a second magnet.