Micro-speaker Sloped Base Wall Prevents Voice Coil Lead Collision
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Solution Overview
Problem
Miniaturization of micro-speakers leads to space constraints, causing voice coil leads to collide with the yoke, negatively affecting sound frequency quality.
Innovation Solution
The micro-speaker design includes a frame with positioning portions and conductive terminals to securely house the voice coil leads, preventing collisions and ensuring proper electrical connection, while the yoke and magnet configuration forms a magnetic gap to facilitate sound wave production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the micro-speaker is miniaturized to reduce size and weight, then portability is improved, but the voice coil leads collide with the yoke causing degradation in sound frequency quality
Solution Approach 1:
The base wall is designed with a sloped surface that creates a three-dimensional pathway for the voice coil leads to extend along the slope rather than in a straight line. This dimensional change in lead routing provides sufficient clearance from the yoke while maintaining the compact overall speaker dimensions, thus preventing lead-yoke collision and preserving sound frequency quality.
Solution Approach 2:
The base wall is divided into different functional portions: a first portion for magnetic circuit attachment, a second portion for voice coil lead extension, and a sloped connecting portion linking them. This segmentation allows each portion to be optimized independently - the slope provides lead clearance while the flat portions maintain structural integrity and magnetic circuit functionality.
2Length of moving object
If the micro-speaker is designed smaller and thinner to meet portability demands, then device compactness is improved, but no extra space is provided for voice coil lead extension
Solution Approach 1:
Instead of extending leads in the vertical thickness direction, the design utilizes the sloped surface of the base wall to route leads diagonally across the speaker footprint. This dimensional redirection allows adequate lead extension space within the constrained thickness while maintaining compact overall dimensions.
Solution Approach 2:
The base wall slope changes the geometric parameters of the lead routing path, transforming a potentially colliding straight-line trajectory into a cleared diagonal path. This parameter change in lead extension geometry enables sufficient lead length and clearance within the reduced speaker thickness.
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 enhances sound quality by preventing voice coil lead collisions, allowing for improved frequency response and efficient sound wave generation in compact micro-speaker devices.
Implementation Method 1
the voice coil will be activated to vibrate by the electromagnetic Ampere Force and further drives the diaphragm to vibrate, which converts the electrical signals to sound waves
Implementation Method 2
a magnetic circuit defining a magnetic gap... The magnetic gap is formed between the yoke and the magnet, and the voice coil is suspended in the magnetic gap
Data Source
AI summary
A micro-speaker is disclosed. The micro-speaker includes a frame with a hollow space, a diaphragm attached to the frame, a voice coil with a lead, a yoke received in the hollow space, a magnet received in the yoke. The yoke includes a base wall in shape of rectangle with two long boundaries and two short boundaries. The base wall includes a first portion locating at the middle of the base wall and two second portions locating at two ends of the first portion and extending to the two short boundaries respectively. The first portion has a thickness greater than the second portion. The second portion of the base wall provides an extra space for at least part of the lead so as to avoid the lead bumping against the base wall.