LED Headlight Protruding Portion Rib Stiffness Heat Dissipation
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Solution Overview
Problem
Headlights with protruding portions face challenges in achieving sufficient support stiffness while maintaining luminous intensity distribution and efficient heat dissipation when using LED chips as light sources, as increasing the cross-sectional area for support can compromise light distribution and elongating the protruding portion for heat dissipation may reduce support stiffness.
Innovation Solution
A headlight design featuring a protruding portion that forwardly protrudes from a rear wall portion, with a rib portion connected to the circumferential wall, creating a larger heat dissipation space without increasing the cross-sectional area, and allowing for enhanced luminous intensity distribution by maintaining a distance between the protruding portion and the circumferential wall.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the cross-sectional area of the protruding portion is increased to enhance support stiffness, then support stiffness is improved, but the distance between the reflector member and LED light source is reduced, deteriorating luminous intensity distribution
Solution Approach 1:
The invention transitions from a two-dimensional cross-sectional area increase to a three-dimensional space utilization by creating a hollow protruding portion. This allows the heat dissipation space to be formed in the longitudinal direction (along the protruding length) rather than requiring increased radial cross-sectional area, thus maintaining both support stiffness and luminous intensity distribution while providing adequate heat dissipation volume.
2Temperature
If the protruding portion is forwardly elongated to produce a large heat dissipation space, then heat dissipation efficiency is improved, but the protruding portion becomes more cantilevered, reducing support stiffness
Solution Approach 1:
The invention segments the protruding portion into a hollow structure with internal heat dissipation space, separating the functions of structural support (provided by the outer shell) and heat dissipation (provided by the internal cavity). This segmentation allows the protruding portion to maintain adequate length for heat dissipation while the hollow structure provides sufficient structural stiffness.
3Shape
If the LED board is disposed in the interior of the protruding portion to hide it from outside view, then aesthetic properties are improved, but heat dissipation from the LED board is blocked
Solution Approach 1:
The invention creates a hollow porous-like structure within the protruding portion, forming an internal cavity that serves as heat dissipation space. This hollow structure allows heat to dissipate from the LED board through convection and radiation within the cavity, while the outer shell maintains the aesthetic appearance by hiding the LED board from external view.
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 design achieves the necessary support stiffness and luminous intensity distribution while improving heat dissipation efficiency, allowing for a balanced performance in headlight functionality.
Implementation Method 1
The rib portion extends in a radial direction of the circumferential wall portion and is connected to the protruding portion and the circumferential wall portion
Implementation Method 2
The reflector member is accommodated in the housing and reflects a light irradiated from the LED chip
Implementation Method 3
The clear cover is covering the opening of the housing and permits the light irradiated from the LED chip to forwardly pass therethrough
Implementation Method 4
dissipation of heat from the LED board is inevitably blocked by the protruding portion enclosing the LED board
Data Source
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AI summary
A rear wall portion is at least partially disposed rearward of an LED chip. The rear wall portion forwardly reflects a light irradiated from the LED chip. A circumferential wall portion forwardly extends from the rear wall portion and extends circumferentially about an axis extending in a back-and-forth direction. A protruding portion forwardly protrudes from the rear wall portion while being disposed radially inward of the circumferential wall portion. A rib portion extends in a radial direction of the circumferential wall portion and is connected to the protruding portion and the circumferential wall portion. A housing includes a board mount space in which the LED board is disposed. The board mount space includes a first space and a second space. The first space is produced inside the protruding portion. The second space is produced inside the rib portion and communicates with the first space.