Line Lighting Device Orthogonal Assembly Vibration Stability
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Solution Overview
Problem
Conventional line lighting devices experience unstable light emission due to positional shifts between the light guide rod and the light emitter during vehicle vibrations, as their fixing directions are not orthogonal, leading to potential misalignment.
Innovation Solution
A line lighting device design where the light emitting unit is installed by rotating it with respect to the light guide rod and case, maintaining the first end of the light guide rod parallel to the light emitter, and incorporating a rib structure that increases in protrusion or thickness stepwise to enhance stability and facilitate accurate installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the light emitting unit is fixed to the light guide rod using a conventional receiving recess structure, then the assembly is simple to manufacture, but the positional relationship between the light guide rod and light emitter shifts under vibration
Solution Approach 1:
The light emitting unit is pre-rotated by a predetermined angle during assembly so that its fixing direction becomes orthogonal to the fixing direction between the light guide rod and case. This preliminary rotational action ensures that when vibration occurs, the orthogonal fixing directions prevent positional shifts, maintaining stable light emission without requiring complex additional components
Solution Approach 2:
The patent introduces asymmetric fixing directions by rotating the light emitting unit at a predetermined angle (90 degrees) relative to the light guide rod and case. This asymmetric orthogonal arrangement creates different fixing orientations that resist vibration-induced displacement, improving reliability while keeping the device structure relatively simple
2Reliability
If the light emitting unit is rotated by a predetermined angle during installation, then the positional stability under vibration is improved, but the installation process becomes more complex
Solution Approach 1:
The light emitting unit incorporates a built-in rotation mechanism that automatically rotates it by a predetermined angle during the assembly process. This preliminary rotational action is integrated into the assembly flow, ensuring orthogonal fixing directions are achieved without requiring separate complex adjustment steps, thereby maintaining ease of manufacture while improving positional stability
Solution Approach 2:
The light emitting unit's rotation mechanism performs the orientation adjustment automatically during assembly, making the system self-servicing. The predetermined angle rotation occurs as part of the natural assembly sequence, reducing the need for external intervention or complex tooling, thus improving reliability without significantly increasing manufacturing 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 stabilizes light emission by eliminating positional shifts between the light guide rod and the light emitter, even under vibration, and allows for efficient assembly by providing a clear indication of the rib's bending rigidity and locking part placement.
Implementation Method 1
a light guide rod formed in a rod-like shape that transmits the light emitted by the light emitting unit and guides the light in a longitudinal direction thereof
Data Source
AI summary
A line lighting device includes a light emitting unit, a light guide rod and a case. The light emitting unit includes a light emitter emitting light. The light guide rod transmits the light emitted by the light emitting unit and guides the light in a longitudinal direction thereof. The case includes a case main body receiving the light guide rod therein. The light emitting unit is installed to the light guide rod and the case by rotating the light emitting unit by a predetermined angle with respect to the light guide rod and the case, while maintaining a state where a first end of the light guide rod in the longitudinal direction of the light guide rod is opposed to the light emitter.