Tablet Woofer With Four Independent Drive Units
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Solution Overview
Problem
Traditional woofers in thin electronic devices are too thick and heavy, with large magnetic circuits and voice coils that are costly and inefficient, making them unsuitable for modern thin-type electronic products.
Innovation Solution
A tablet woofer design featuring a rectangular vibrating diaphragm with four independent driving units, each comprising a small voice coil and magnetic circuit, arranged at the corners to reduce thickness and size, using a housing made of aluminum alloy and FPCB connectors for efficient electrical connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a traditional tapered paper cone vibrating diaphragm with central voice coil is used, then the woofer structure is simple and easy to manufacture, but the thickness and size of the magnetic circuit system become too large to meet thin-type electronic device requirements
Solution Approach 1:
The patent divides the woofer structure into multiple independent driving units (at least four) distributed around the periphery of the vibrating diaphragm. Each driving unit comprises a voice coil unit and corresponding magnetic circuit unit, replacing the traditional single central voice coil configuration. This segmentation allows the magnetic circuit system to be distributed and thinned, reducing overall thickness while maintaining driving capability.
Solution Approach 2:
The patent transitions from a single central voice coil arrangement to a multi-dimensional distributed configuration of multiple voice coil units around the periphery. This spatial redistribution in multiple dimensions allows the magnetic circuit system to achieve thinning while maintaining effective driving force distribution across the vibrating diaphragm.
2Reliability
If a larger caliber vibrating diaphragm is used to ensure low-frequency sound effect, then the low-frequency performance is improved, but the voice coil size increases causing difficult winding and easy deformation
Solution Approach 1:
The patent segments the driving function into multiple smaller voice coil units distributed around the periphery instead of using one large central voice coil. Each voice coil unit has smaller dimensions, making winding easier and deformation less likely, while the collective arrangement maintains the driving force needed for large-area vibrating diaphragms to produce effective low-frequency sound.
Solution Approach 2:
The patent applies different driving configurations to different regions of the vibrating diaphragm. The voice coil units are positioned at specific peripheral locations rather than centrally, creating localized driving zones that collectively cover the entire diaphragm area. This allows optimal local driving efficiency while maintaining overall low-frequency performance.
3Length of stationary object
If the thickness of washers and frames is reduced to meet thinned application requirements, then the overall thickness is reduced, but the magnetic circuit system becomes easy to saturate and magnet performance becomes excessive leading to wastage and high cost
Solution Approach 1:
The patent divides the magnetic circuit system into multiple distributed magnetic circuit units, each corresponding to a voice coil unit. This segmentation allows the magnetic flux to be distributed across multiple paths rather than concentrated in a single large magnetic circuit, reducing saturation risk even with reduced washer and frame thickness. The distributed configuration improves magnetic efficiency and reduces material wastage.
Solution Approach 2:
The patent redistributes the magnetic circuit system from a centralized configuration to a multi-dimensional distributed arrangement around the periphery. This spatial redistribution creates multiple magnetic flux paths, increasing overall magnetic circuit efficiency and preventing saturation even with thinned washers and frames, thereby optimizing magnet performance and reducing cost.
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 thickness and cost of the woofer while improving sensitivity and driving power, allowing for more compact and efficient loudspeaker performance in thin electronic devices.
Implementation Method 1
The driving unit comprises a voice coil unit and a magnetic circuit unit corresponding to the voice coil unit
Data Source
AI summary
A tablet woofer and an electronic device using same. The woofer comprises a vibrating diaphragm, at least four mutually independent drive units (5), and a housing (3). The vibrating diaphragm is a rectangle shape, and comprises a rigid arc portion (1) at the central position and a spiral curve portion (2) at the periphery; the drive unit (5) comprises a voice coil unit and a corresponding magnetic circuit unit, and four angles of the arc portion (1) of the vibrating diaphragm are each combined with one voice coil unit; the housing (3) is provided with mounting holes (4) for accommodating and mounting the drive units (5), and sound holes penetrating through the mounting plane; the spiral curve portion (2) of the vibrating diaphragm is fixedly connected to the periphery of the upper side of the housing (3).