Speaker Unit with Integrated Diaphragm and Magnetic Circuit
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Solution Overview
Problem
Existing thin speaker units require a double ring structure, increasing component count and cost, with heat-resistant materials needed for the double ring, which adds mass and delays sound response, degrading sound quality.
Innovation Solution
A speaker unit design featuring a magnetic circuit with a standing wall and slit configuration, where the diaphragm has a center hole connected to the voice coil, eliminating the need for a double ring and reducing mass, allowing for thinner construction without compromising sound quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a double ring structure is used to connect the diaphragm to the voice coil, then the speaker unit can be made thinner, but the number of components increases and cost increases
Solution Approach 1:
The invention merges the double ring structure with the diaphragm by forming an integrated unit where the first ring is connected to the voice coil and the second ring is connected to the diaphragm's inner peripheral portion. This integration eliminates the need for separate connection components while maintaining the thin profile, directly resolving the contradiction between reduced thickness and component complexity.
2Length of stationary object
If a double ring structure is used to connect the diaphragm to the voice coil, then the speaker unit can be made thinner, but heat-resistant materials are required which increases cost
Solution Approach 1:
The diaphragm's inner peripheral portion serves multiple functions: it acts as the sound-radiating surface, provides structural support, and serves as the connection element to the voice coil through the second ring. This multi-functionality eliminates the need for separate heat-resistant connection components, reducing material costs while enabling thinner construction.
3Reliability
If the double ring is included in the vibrating portion, then the connection structure is complete, but the mass increases requiring a stronger magnetic circuit
Solution Approach 1:
The connection structure is segmented into two functional parts: the first ring connected to the voice coil that remains stationary, and the second ring connected to the diaphragm that moves with it. This segmentation allows the magnetic circuit to only drive the essential vibrating mass (diaphragm + second ring) rather than the entire double ring structure, reducing the required magnetic circuit strength while maintaining connection reliability.
4Reliability
If the vibrating portion mass is increased by including the double ring, then the connection is secure, but the response of the diaphragm is delayed deteriorating sound quality
Solution Approach 1:
The connection structure is designed to be dynamically selective: the first ring remains stationary during operation while the second ring moves dynamically with the diaphragm. This dynamic design ensures secure connection where needed while minimizing added mass in the vibrating portion, thereby maintaining fast diaphragm response and high sound quality.
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 reduces the number of components and cost, improves sound quality by minimizing mass and enhancing response, while maintaining the diaphragm's rigidity and overall height, allowing for more efficient sound propagation.
Implementation Method 1
When a voice signal is supplied to the coil 2 of the voice coil 3 arranged in the magnetic gap, a driving force (propulsion force) is generated in the voice coil 3 due to the Fleming's left-hand rule
Data Source
AI summary
A speaker unit, which can be made thin, includes: a magnetic circuit 61 having a space serving as a magnetic gap G formed inside a cylindrical portion 69; a voice coil 85 arranged in the magnetic gap G; and a diaphragm 51 having a center hole 51a that penetrates a center of the diaphragm, an outer peripheral portion 51b supported on a frame 53, and an inner peripheral portion 51c whose inner peripheral surface is connected to the voice coil 85. The cylindrical portion 69 of the magnetic circuit 61 includes a standing wall 69c formed along a vibration direction A of the diaphragm 51, and a slit 69a. The inner peripheral portion 51c of the diaphragm 51 includes an insert hole (a standing wall receiving portion) 57 in which the standing wall 69c is inserted, and an insert portion 59 which is inserted in the slit 69a.