Light Source Device With Elastic Light Guide Rod Fixing
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Solution Overview
Problem
The structural stability and heat dissipation issues in LED bulbs with light guide rods, particularly in automotive lighting, where the separation of the light source and light guide rod leads to poor stability and non-uniform light distribution, and direct thermal contact causes mismatched thermal expansion.
Innovation Solution
A light source device with a solid light guide rod fixed by a movable fixing assembly, including an isolation, elastic, and rigid layer, and a protective pad to prevent sliding and improve thermal stability, combined with a heat dissipation assembly for efficient heat management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the LED chip and light guide rod are separated to improve heat dissipation, then heat dissipation performance is improved, but structural stability deteriorates due to poor fixation in vibrating environments
Solution Approach 1:
The patent divides the bulb into separate functional modules: the LED chip assembly and the light guide rod assembly, connected through a dedicated connection structure. This segmentation allows independent optimization of heat dissipation for the LED module while maintaining structural stability through the specialized connection design that accommodates vibration and thermal expansion differences.
Solution Approach 2:
The patent introduces a connection structure as an intermediary element between the LED chip assembly and light guide rod assembly. This intermediary component serves as a buffer that absorbs thermal expansion differences and maintains stable connection in vibrating environments, resolving the contradiction between heat dissipation requirements and structural stability.
2Shape
If the LED chip is arranged at the bottom of the bulb to simulate halogen filament light form, then light form simulation is improved, but light distribution uniformity deteriorates due to backplane interference
Solution Approach 1:
The patent extracts the light guide rod from the traditional integrated bulb structure and makes it a separate, replaceable component with precise optical surfaces. By taking out the light guiding function and implementing it through a dedicated rod with controlled geometry and surface properties, the patent achieves uniform light distribution while maintaining the simulated filament light form, overcoming the backplane interference problem.
3Device complexity
If direct thermal contact is made between LED chip and light guide rod to simplify structure, then structural complexity is reduced, but thermal expansion mismatch causes structural instability
Solution Approach 1:
The connection structure acts as a thermal and mechanical intermediary between the LED chip assembly and light guide rod assembly. It provides thermal isolation to prevent heat transfer that would cause thermal expansion mismatch, while simultaneously maintaining mechanical stability in vibrating environments. This intermediary approach avoids direct thermal contact while keeping the overall structure relatively simple.
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
Enhances structural stability and light uniformity by preventing sliding and direct thermal contact, while improving light coupling efficiency and heat dissipation, suitable for modular installation in various lamps.
Implementation Method 1
a movable fixing assembly configured to fix the light guide rod along a radial direction of the light guide rod together with the groove of the first positioning member, the movable fixing assembly being deformed when fixing the light guide rod
Implementation Method 2
the first light guide portion including a light incident end surface, the first light entering the light guide rod through the light incident end surface and being transmitted to the second light guide portion after passing through the first light guide portion
Data Source
Figure 1~2
Figure 3~5
Figure 6~7
AI summary
A light source device, comprising: a light-emitting chip (13) provided on a base plate (4) and used for emitting first light; a light guide rod (10) comprising a first light guide portion (101) and a second light guide portion (102), the first light guide portion (101) comprising a light incident end face (1011), the first light entering the light guide rod (10) through the light incident end face (1011), and being introduced to the second light guide portion (102) by means of the first light guide portion (101), and the second light guide portion (102) comprising a light emergent face (1022) for emitting light; a first positioning member (6) comprising a groove (61) for accommodating the light guide rod (10), the first positioning member (6) and the base plate (4) being directly or indirectly fixed in position; and a movable fixing assembly (7, 8, 9) fixing the light guide rod (10) in a radial direction of the light guide rod (10) together with the groove (61) of the first positioning member (6), the movable fixing assembly (7, 8, 9) deforming when fixing the light guide rod (10). The light source device of the present technical solution has better structural stability and mounting accuracy.