Vehicular Lighting Tool Lens Positioning Mechanism
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Solution Overview
Problem
The challenge in vehicular lighting tools is the difficulty in assembling inner and outer lenses while maintaining a continuous light emitting region due to the gap between the lid lamp and rear combination lamp, which hinders the reduction of the distance between the sidewall portion of the outer lens and the end portion of the inner lens.
Innovation Solution
The solution involves a vehicular lighting tool design with guide and positioning convex portions on the outer lens and guide holes and positioning holes on the inner lens, allowing for easy assembly by inserting the guide convex portion into the guide hole and positioning convex portion into the positioning hole, thereby positioning the inner lens relative to the outer lens in the leftward/rightward direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the inner lens is positioned close to the inner side surface of the outer lens to form a continuous light emitting region, then the appearance of light emission is improved, but it becomes difficult to dispose the inner lens in the accommodating space when the sidewall portion of the outer lens is recessed
Solution Approach 1:
The positioning mechanism is segmented into guide convex portions on the outer lens that fit into guide holes in the inner lens, allowing staged insertion and positioning. This segmentation enables the complex positioning task to be broken down into manageable insertion steps.
Solution Approach 2:
Guide convex portions and guide holes act as intermediary positioning elements between the inner lens and outer lens. These intermediaries facilitate the positioning process by providing guided insertion paths, making assembly easier while achieving the desired close positioning for continuous light emission.
2Ease of operation
If guide and positioning convex portions are added to the outer lens and guide holes and positioning holes are added to the inner lens, then assembly is facilitated, but the device complexity increases
Solution Approach 1:
The guide and positioning functions are merged into a single integrated mechanism where guide convex portions fit into guide holes for alignment, and positioning convex portions fit into positioning holes for final positioning. This merging reduces the number of separate components needed while achieving multiple functions.
Solution Approach 2:
The convex portions and holes serve multiple functions: they provide alignment guidance, positioning, and retention all in one structural feature. This multi-functionality reduces the need for separate alignment pins, positioning screws, or retention clips, thereby reducing overall device complexity while improving ease of assembly.
Data Source
AI summary
A vehicular lighting tool has an emission part, an inner lens located on a rear side of the emission part, and an outer lens located on a rear side of the inner lens, the outer lens has a guide convex portion and a positioning convex portion protruding forward, the inner lens has a guide hole and a positioning hole, the guide convex portion is inserted into the guide hole in a state in which a gap is provided in a leftward/rightward direction, and the inner lens is positioned in the leftward/rightward direction by the positioning convex portion being inserted into the positioning hole.