Motor Vehicle Lighting Module Spacing and Positioning
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Solution Overview
Problem
Existing motor vehicle lighting and signaling devices face challenges in precise positioning and fixing of optical modules due to vibrations and heat generation, which can damage plastic housing components.
Innovation Solution
The solution involves an optical module with a printed circuit and optical part that includes holding, fixing, and positioning means, along with spacers to maintain a distance between the printed circuit and the housing, preventing direct contact and heat transfer, and utilizing complementary positioning and fixing means for precise alignment and secure assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the printed circuit is positioned in contact with the bottom wall of the case for structural support, then the assembly is simplified, but the heat generated by the light source deteriorates the plastic material of the housing
Solution Approach 1:
The patent introduces spacers as intermediary elements positioned between the printed circuit and the bottom wall of the case. These spacers act as a mediator that prevents direct thermal contact while maintaining the structural support function, thereby isolating the heat source from the plastic housing material without complicating the assembly process
Solution Approach 2:
The patent extracts the thermal contact function from the structural support function by removing the printed circuit from direct contact with the housing bottom wall. The spacers take out the thermal conduction path while the housing continues to provide structural support, separating the two functions to prevent heat damage
2Manufacturing precision
If the optical module elements are held in position with precision to comply with photometric regulations, then the lighting performance is improved, but the device becomes more complex and difficult to assemble
Solution Approach 1:
The patent merges multiple functions into integrated components: the holding means, fixing means, and positioning means are combined into a unified attachment structure that secures the printed circuit to the optical part. This integration maintains precise positioning requirements while simplifying the assembly process by reducing the number of separate operations needed
Solution Approach 2:
The patent implements preliminary positioning actions through pre-configured holding and positioning means that are already in place on the optical part before assembly. This preliminary arrangement ensures precise positioning is achieved automatically during assembly, reducing the need for complex post-assembly adjustments
Data Source
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AI summary
A motor vehicle lighting device (50) comprising a housing (40) and an optical module (30) which includes a printed circuit board (20) supporting at least one light source (25) on one of its faces and an optical piece (10) shaping the light beams from the light source (25), characterized in that the optical piece (10) includes means for retaining (2) the printed circuit board (20), means for fixing (3) the optical module (30) on the housing (40) and means for positioning (4) the printed circuit board (20) and the housing (40), the housing (40) includes additional positioning means (44) of the optical module (30) on the housing (40), additional fixing means (43) cooperating with the fixing means (3) and spacers (42) supporting the printed circuit board (20) on the face opposite that of the light source (25).