Voice Coil Bobbin with Angled Integral Flanges for Compact Driver Design
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Solution Overview
Problem
Existing electroacoustic driver designs, such as those disclosed in U.S. Pat. No. 4,591,667 and U.S. Pat. No. 1,767,837, result in unnecessary dimensions in the voice coil bobbin during operation due to design features like cut-out portions and flanged extensions, which increase the bobbin's size in the direction of travel, leading to inefficiencies in compactness and performance.
Innovation Solution
A voice coil bobbin with a plurality of cutouts for venting and integral flanges at the end, where the flanges extend at an angle no more than 39 degrees relative to the intended direction of travel, allowing for secure diaphragm attachment and a compact design, with an electrically conductive voice coil wound around the bobbin that may partially cover the cutouts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cut-out portions are provided at the top end of the bobbin for varying resonance conditions, then the resonance performance of the diaphragm is improved, but the dimension of the bobbin in the direction of travel increases
Solution Approach 1:
The flanges are extended at an angle of 45 degrees or more relative to the direction of travel, effectively utilizing the radial dimension to provide resonance control features without increasing the axial length of the bobbin. This dimensional reorientation allows the cut-out portions to be positioned such that they do not extend beyond the voice coil's coverage area in the travel direction.
2Strength
If a flanged extension is oriented at a forty five degree angle relative to the direction of travel to secure the diaphragm, then the diaphragm attachment is improved, but the dimension of the coil form in the direction of travel increases
Solution Approach 1:
The flanges are extended at an angle of 45 degrees or more relative to the direction of travel, effectively utilizing the radial dimension to provide resonance control features without increasing the axial length of the bobbin. This dimensional reorientation allows the cut-out portions to be positioned such that they do not extend beyond the voice coil's coverage area in the travel direction.
3Length of moving object
If the bobbin dimension is reduced to achieve compactness, then the overall size of the speaker is reduced, but the resonance control capability is compromised
Solution Approach 1:
The flanges are extended at an angle of 45 degrees or more relative to the direction of travel, effectively utilizing the radial dimension to provide resonance control features without increasing the axial length of the bobbin. This dimensional reorientation allows the cut-out portions to be positioned such that they do not extend beyond the voice coil's coverage area in the travel direction.
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
The compact geometry of the bobbin reduces the overall size of the electroacoustic driver and speaker, enhancing their compactness and operational efficiency.
Implementation Method 1
An electrically conductive voice coil is wound around the bobbin
Implementation Method 2
The bobbin has a plurality of cutouts for venting an interior of the bobbin
Data Source
AI summary
An apparatus includes a voice coil bobbin for an electroacoustic driver. The bobbin has a plurality of cutouts for venting an interior of the bobbin. The bobbin includes a plurality of integral flanges at the end of the bobbin which can be used to secure a diaphragm to the end of the bobbin. Each of the flanges extends from the bobbin at an angle that is no more than about thirty nine degrees relative to a plane that is substantially perpendicular to an intended direction of travel of the bobbin during operation of the driver. An electrically conductive voice coil is wound around the bobbin.