Compact Speaker With Dual Diaphragms For Portable Terminals
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Solution Overview
Problem
Existing speakers that achieve bidirectional sound generation are difficult to widely use due to their large size, as they require separate magnetic circuits and voice coil-diaphragm structures for high and low frequencies, making them unsuitable for compact applications like portable terminals.
Innovation Solution
A speaker design featuring an active vibrating unit with a first diaphragm and voice coil assembly, a passive vibrating unit driven by the active unit, and a magnetic circuit system with air guide holes to maintain pressure balance and transmit vibrations, allowing for bidirectional sound emission with a single voice coil and magnetic circuit system, optimizing space usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two sets of voice coil and diaphragm combined structure and magnetic circuit system are used to achieve bidirectional sounding, then bidirectional sound generation is realized, but the speaker size becomes large and difficult to be widely used
Solution Approach 1:
The patent merges two independent voice coil-diaphragm systems into a single integrated structure where one voice coil assembly drives one diaphragm that simultaneously vibrates another diaphragm. This combining of functions allows bidirectional sound generation while reducing the number of separate magnetic circuit systems and voice coil assemblies, thereby reducing overall speaker size.
Solution Approach 2:
The single voice coil assembly and magnetic circuit system perform multiple functions: directly driving the first diaphragm for sound generation and simultaneously driving the second diaphragm through mechanical coupling for bidirectional sound emission. This multi-functionality eliminates the need for separate dedicated high-frequency and low-frequency speaker systems.
2Volume of moving object
If one set of voice coil and diaphragm combined structure is used, then the speaker size is reduced, but simultaneous bidirectional sounding cannot be achieved
Solution Approach 1:
The patent creates a dynamic coupling mechanism where the first diaphragm mechanically drives the second diaphragm through their interaction with the magnetic circuit system. This dynamic mechanical coupling allows a single voice coil assembly to simultaneously produce bidirectional sound by transferring vibrational energy to both diaphragms in real-time, achieving versatility without increasing size.
3Adaptability or versatility
If two independent voice coil and diaphragm structures work independently as high frequency and low frequency speakers, then frequency separation is achieved, but simultaneous bidirectional sounding cannot be achieved and device complexity increases
Solution Approach 1:
The patent combines frequency separation and bidirectional sound generation into a single integrated system. The magnetic circuit system with its specific pole piece arrangement and the mechanically coupled diaphragms allow different frequency ranges to be produced simultaneously in different directions, eliminating the need for four separate independent speaker systems (two for each direction) and significantly reducing structural complexity.
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 enables bidirectional sound emission in a compact form, reducing the speaker's volume and making it suitable for portable terminals by synchronizing the vibration of both diaphragms, achieving efficient sound radiation in both directions with reduced size and complexity.
Implementation Method 1
a voice coil assembly for fixing and driving the first vibrating diaphragm; a magnetic circuit system, acting with the voice coil assembly to drive the first vibrating diaphragm of the active vibrating unit to vibrate
Implementation Method 2
a magnetic circuit system, acting with the voice coil assembly to drive the first vibrating diaphragm of the active vibrating unit to vibrate
Implementation Method 3
the magnetic circuit system defines an air guide hole communicating the first acoustic cavity and the second acoustic cavity; the air guide hole is configured for maintaining a pressure balance in the first acoustic cavity, the second acoustic cavity, and the air guide hole, and a pressure change is generated during a vibration of the first vibrating diaphragm to drive the second vibrating diaphragm to vibrate
Data Source
AI summary
Disclosed are a speaker and a portable terminal, where the speaker includes: an active vibrating unit, including a first vibrating diaphragm vibrating for radiating a sound, and a voice coil assembly for fixing and driving the first vibrating diaphragm; a passive vibrating unit, including a second vibrating diaphragm and driven by the active vibrating unit to vibrate; and a magnetic circuit system, acting with the voice coil assembly to drive the first vibrating diaphragm of the active vibrating unit to vibrate, where the magnetic circuit system is arranged between the first vibrating diaphragm and the second vibrating diaphragm, a first acoustic cavity is defined between the magnetic circuit system and the first vibrating diaphragm, and a second acoustic cavity is defined between the magnetic circuit system and the second vibrating diaphragm.