Motor Vehicle Lighting Unit Circuit Board Sandwich Assembly
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Solution Overview
Problem
Existing motor vehicle lighting units face challenges in the assembly process, particularly in securing the circuit board's spatial orientation relative to the reflector and heat sink, leading to complex and potentially unreliable structural designs.
Innovation Solution
The circuit board is positioned between the reflector and the heat sink in a sandwich construction, with corresponding fasteners and latches that allow for secure spatial alignment and tolerance compensation, enabling tool-free assembly and improved thermal contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the circuit board is secured to the reflector and heat sink using complex fastening mechanisms, then the spatial positioning is more reliable, but the assembly complexity and structural complexity increase
Solution Approach 1:
The patent combines the fastening function and positioning function into a single integrated latch mechanism. The latch simultaneously secures the circuit board to both the reflector and heat sink while maintaining spatial alignment, eliminating the need for separate fastening and positioning components.
Solution Approach 2:
The latch mechanism serves multiple functions: it fastens the circuit board to the reflector, fastens the circuit board to the heat sink, and maintains the predefined spatial position. This multi-functional design reduces the number of components and simplifies the overall assembly structure.
2Manufacturing precision
If tight tolerances are specified for component positioning, then the spatial alignment is more precise, but the manufacturing difficulty and cost increase
Solution Approach 1:
The latch mechanism is designed with built-in tolerance compensation capabilities that pre-accommodate manufacturing variations. The fastening structure includes features that can absorb dimensional deviations, allowing components to be assembled within wider tolerance ranges without compromising the final spatial alignment precision.
3Measurement precision
If multiple separate fastening components are used, then the spatial positioning is more accurate, but the assembly time and productivity decrease
Solution Approach 1:
The patent merges multiple fastening operations into a single latch mechanism that simultaneously secures the circuit board to both the reflector and heat sink. This integrated approach maintains positioning accuracy while enabling tool-free, rapid assembly that significantly improves productivity.
4Manufacturing precision
If the circuit board is positioned using complex positioning mechanisms, then the spatial orientation is more precise, but the device complexity and assembly difficulty increase
Solution Approach 1:
The latch mechanism is designed to simultaneously perform fastening and positioning functions. By integrating these functions into a single mechanism, the patent achieves precise spatial orientation of the circuit board without requiring separate complex positioning mechanisms, thereby reducing overall device complexity.
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 configuration simplifies and robustifies the assembly process, reduces component tolerance requirements, and ensures effective heat dissipation while maintaining a compact design.
Implementation Method 1
the circuit board can be cooled in the region of the light source via the heat sink
Data Source
AI summary
A lighting unit for a motor vehicle, having a reflector, a circuit board with at least one light source, and a heat sink, wherein the circuit board is arranged on the reflector in an assembled state of the lighting unit in such a way that the light source is associated with a reflecting surface of the reflector for directed emission of the light emitted by the light source, and wherein the circuit board can be cooled in the region of the light source via the heat sink in the assembled state of the lighting unit. The circuit board is arranged between the reflector and the heat sink in the assembled state of the lighting unit and is positioned relative to the reflector and the heat sink in a predefined spatial position via the reflector and the heat sink.