Light Emitting Unit Back Panel Heat Dissipation
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Solution Overview
Problem
In light emitting units, increased heat generation from high-luminance light sources can cause deformation and deterioration of light guide bodies and light sources due to inadequate heat management, particularly when a reflector and light distribution control member are used between the light emitting body and the light guide body.
Innovation Solution
A light emitting unit design featuring a substrate with a light emitting element, a front panel covering part of the light emitting surface, and a back panel with higher thermal conductivity than the front panel, including projecting portions that contact the substrate or light emitting element to efficiently conduct heat away from the light emitting element, and ventilation portions in the front panel to enhance heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a reflector and light distribution control member are placed between the light emitting body and the light guide body to control light emission, then the light distribution is improved, but heat accumulates between the light emitting body and the light guide body causing deformation and deterioration
Solution Approach 1:
The patent extracts the light distribution control function from the space between the light emitting body and light guide body by forming a light distribution control member on the light guide body surface. This removes the harmful heat accumulation issue while preserving the light distribution control benefit. The light distribution control member is formed directly on the light guide body using a mold, eliminating the need for separate reflector and control member components in the intermediate space.
Solution Approach 2:
The patent introduces a light distribution control member as an intermediary element formed on the light guide body surface. This mediator controls light distribution while being thermally integrated with the light guide body, preventing heat accumulation. The control member acts as a thermal bridge that conducts heat away from the light emitting body while still performing its light distribution function.
2Use of energy by moving object
If the light guide body is placed in tight contact with the reflector to improve light extraction, then light extraction efficiency is improved, but the light guide body deforms due to heat from the light emitting body
Solution Approach 1:
The patent extracts the light distribution control function from the reflector structure and integrates it directly into the light guide body through a formed light distribution control member. This separation allows the light guide body to maintain its structural integrity while still achieving efficient light extraction through the control member pattern formed on its surface.
Solution Approach 2:
The patent creates a composite structure where the light guide body is integrated with a light distribution control member formed on its surface. This composite structure combines the optical guiding properties of the light guide body with the light distribution control function, while the thermal properties of the composite prevent deformation by conducting heat away from critical areas.
3Shape
If a light distribution control member covers part of the light emitting body to control light shape, then light shape control is improved, but heat accumulation increases causing deformation and deterioration
Solution Approach 1:
The patent extracts the light distribution control function from a covering member and implements it as a surface pattern on the light guide body. This eliminates the heat trapping effect of covering members while maintaining light shape control through the molded light distribution control member pattern on the light guide body surface.
Solution Approach 2:
The patent transitions from controlling light shape using a three-dimensional covering member that traps heat to controlling light shape using a two-dimensional surface pattern on the light guide body. This dimensional change allows light shape control without the heat accumulation problem, as the control function is achieved through surface topology rather than volumetric enclosure.
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 effectively manages heat generated by the light emitting element, reducing the risk of deformation and deterioration of the light guide body and improving the reliability of the light emitting unit by efficiently radiating heat away from the light source.
Implementation Method 1
the back panel has a thermal conductivity higher than that of the front panel, and includes a projecting portion that projects toward the first surface, and the projecting portion is in contact with at least one of the first surface, the light emitting element, or the front panel
Implementation Method 2
an inner wall of the front panel, which includes a circumferential wall of the opening, has a ventilation portion including at least one of a trench or a through hole extending from the inner wall to an outer edge of the front panel
Data Source
AI summary
A light emitting unit is provided. The light emitting unit comprises a substrate, a light emitting element placed on a first surface of the substrate, a front panel covering the first surface, and a back panel placed on a second surface of the substrate, which is opposite to the first surface. An opening for extracting light emitted by the light emitting element is formed in the front panel, and the opening is formed to overlap a part of a light emitting surface of the light emitting element. The back panel has a thermal conductivity higher than that of the front panel, and includes a projecting portion that projects toward the first surface. The projecting portion is in contact with at least one of the first surface, the light emitting element, or the front panel.