Loudspeaker Lead Wire Harness Assembly
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Solution Overview
Problem
Traditional loudspeaker assembly processes are labor-intensive and inefficient, particularly in terminating and securing lead wires, which can introduce resistance and increase assembly time and cost, especially in low-impedance voice coil applications.
Innovation Solution
The use of a lead wire harness that is coupled to the voice coil before assembly, allowing for pre-termination and shaping of lead wires, eliminating the need for a terminal board and reducing resistance by directly connecting to an amplifier board, while also securing the wires in a controlled manner to prevent stress and failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional terminal board assembly is used to terminate lead wires, then connection is achieved, but assembly time and labor cost increase
Solution Approach 1:
The lead wire harness is pre-assembled and pre-terminated with the voice coil before the main loudspeaker assembly process. This preliminary action eliminates the need for time-consuming on-site termination and connection operations during final assembly, directly addressing the productivity-time contradiction by preparing components in advance.
Solution Approach 2:
The patent combines multiple separate operations (lead wire termination, voice coil connection, and harness assembly) into a single integrated lead wire harness assembly. This merging reduces the number of discrete steps and operations required during final assembly, thereby increasing productivity while reducing total assembly time.
2Reliability
If traditional terminal board is used, then lead wire termination is achieved, but resistance increases and signal loss occurs
Solution Approach 1:
The patent extracts and eliminates the terminal board from the assembly, creating a direct connection between the voice coil and the lead wire harness. This removal of the intermediate terminal board component reduces the number of connection interfaces, thereby minimizing resistance and signal loss while improving overall connection reliability.
Solution Approach 2:
The lead wire harness is pre-terminated and pre-connected to the voice coil in advance, creating optimized low-resistance connections before final assembly. This preliminary termination ensures minimal signal loss by establishing direct, high-quality electrical connections without the need for additional connection points that would increase resistance.
3Reliability
If lead wires are secured after assembly, then connection is achieved, but stress and potential failure increase
Solution Approach 1:
The lead wires are secured and positioned within the harness structure before final assembly into the loudspeaker. This preliminary securing action protects the wires from stress and damage during the assembly process and ensures proper positioning, thereby maintaining both connection stability and wire integrity without requiring post-assembly adjustments.
Solution Approach 2:
The harness structure provides pre-established protection and stress distribution for the lead wires before they are subjected to assembly stresses. This beforehand cushioning through proper harness design prevents wire damage and ensures connection reliability by accommodating mechanical stresses in advance rather than allowing them to concentrate on vulnerable connection points.
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 approach simplifies the assembly process, reduces assembly time and cost, and minimizes signal loss by providing a low-resistance connection, making it suitable for low-impedance applications like portable, battery-powered loudspeakers.
Implementation Method 1
A common form of loudspeaker uses a transducer diaphragm (such as, for example, a paper cone) supporting a voice coil electromagnet acting on a permanent magnet
Data Source
AI summary
A method of assembling a loudspeaker may include resiliently coupling a voice coil assembly to a transducer basket, the voice coil assembly including a voice coil and first and second lead wires having corresponding proximal and distal ends, where the proximal ends of the lead wires are attached to the voice coil. The method also includes forming a first segment of the first lead wire into a first shape, and forming a second segment of the second lead wire into a second shape. The method also includes affixing an intermediate portion of the first lead wire to a first location on the transducer basket, and affixing an intermediate portion of the second lead wire to a second location on the transducer basket. The method also includes conductively coupling the distal ends of the first and second lead wires to a harness configured to directly connect to an amplifier board.