Back-to-Back Speaker With Perpendicular Voice Coils
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Solution Overview
Problem
Existing back-to-back speakers suffer from poor leakage effect and unsynchronized diaphragm amplitudes, leading to inefficiencies in sound production and increased height requirements.
Innovation Solution
The speaker design includes two vibration systems with diaphragms and voice coils arranged in a back-to-back configuration, with voice coils spaced apart in perpendicular directions within a magnetic circuit system that includes main and auxiliary magnets, and a pole plate with avoiding holes to optimize voice coil placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two voice coils are arranged vertically with one around the other in related art, then the speaker structure is compact, but the leakage effect is poor and diaphragm amplitudes are not synchronized
Solution Approach 1:
The patent changes the arrangement dimension of voice coils from vertical stacking to horizontal placement. The first voice coil is arranged in a first direction while the second voice coil is arranged in a second direction perpendicular to the first direction, both within the same magnetic gap. This dimensional change allows both voice coils to operate independently without vertical interference, improving synchronization and leakage effect while maintaining compact structure.
2Length of moving object
If voice coils are arranged to avoid each other's pole plate thickness in the height direction, then structural interference is avoided, but the speaker height increases
Solution Approach 1:
Instead of arranging voice coils vertically to avoid pole plate interference (which increases height), the patent places both voice coils horizontally in the same magnetic gap at different angular positions. The first voice coil is positioned to avoid the first pole plate while the second voice coil avoids the second pole plate, both within the same height zone. This eliminates the need for vertical separation, reducing speaker height while avoiding structural interference.
Solution Approach 2:
The patent employs asymmetric arrangement of voice coils and pole plates. The first voice coil and second voice coil are positioned at different angular locations around the magnetic gap, with corresponding asymmetric pole plate configurations. This asymmetric design allows both voice coils to operate in the same magnetic gap without interfering with each other's pole plates, optimizing space utilization and reducing overall height.
3Reliability
If two voice coils are driven separately with vertical arrangement, then manufacturing is simplified, but the amplitudes of the two diaphragms are not synchronized leading to poor sound quality
Solution Approach 1:
The patent transitions from vertical stacking of voice coils to horizontal arrangement in the same magnetic gap. Both voice coils are positioned in the first direction within the magnetic gap, allowing them to be driven separately while responding synchronously to the same magnetic field. This horizontal arrangement improves amplitude synchronization by eliminating vertical misalignment issues while keeping the manufacturing process relatively simple.
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 achieves synchronized diaphragm amplitudes, improves the leakage effect, and reduces the overall height of the speaker while maintaining effective sound production.
Implementation Method 1
a first vibration system includes a first diaphragm and a pair of first voice coils connected with the first diaphragm and driving the first diaphragm to generate sounds. The second vibration system includes a second diaphragm and a pair of second voice coils connected with the second diaphragm and driving the second diaphragm to generate sounds
Data Source
AI summary
The present invention provides a speaker including a first frame, a second frame, a first vibration system, a second vibration system, and a magnetic circuit system. The first vibration system includes a first diaphragm and a pair of first voice coils. The second vibration system includes a second diaphragm and a pair of second voice coils. The pair of first voice coils is arranged spaced apart from each other in a first direction. The pair of second voice coils is arranged spaced apart from each other in a second direction. The first and second directions are perpendicular to a vibration direction of the first diaphragm. The first direction is perpendicular to the second direction. Winding planes of the first and second voice coils are parallel to the vibration direction. The speaker of the present invention has strong anti-swing ability and can save space in the height direction.