Surface Light Source Device Heat Dissipation Structure
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Solution Overview
Problem
Surface light-source devices using point light sources face issues with heat radiation and reliability, leading to reduced light flux and limited lifespan, and their bulky structures and increased parts make them unsuitable for long-term use in devices like machine tools.
Innovation Solution
A surface light-source device with a heat radiation structure that includes a light-guide plate, a substrate holder with projections for clamping the light-source substrate, and holes for efficient heat dissipation, allowing for easy replacement of point light sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the density of light emitting elements is increased or current supplied to each light emitting element is increased to enhance display panel luminance, then luminance is improved, but temperature in the vicinity of the light emitting elements rises due to heat generation
Solution Approach 1:
A heat radiation plate is introduced as an intermediary component between the light emitting elements and the housing case. This plate has high heat radiation capability and is in close contact with the light emitting elements, serving as a mediator to transfer heat away from the light sources effectively while maintaining structural integrity and enabling continued high luminance operation
Solution Approach 2:
The patent replaces conventional heat dissipation methods with a specialized heat radiation plate that has optimized thermal conduction properties. The plate is designed with specific structural features (protrusions, recesses) that enhance thermal contact without requiring complex mechanical pressure systems or additional fastening mechanisms
2Temperature
If heat radiation means is attached to the point light-source substrate to enhance heat radiation performance, then heat radiation is improved, but periphery or thickness of the device becomes large and number of parts increases
Solution Approach 1:
The heat radiation plate is merged with the housing case structure, where the case itself serves dual purposes as both structural enclosure and heat dissipation component. The plate is integrated into the case design rather than being a separate attached component, reducing overall part count while maintaining effective heat radiation
Solution Approach 2:
The housing case is designed to serve multiple functions simultaneously: structural support, light guiding (through the light-guide plate), and heat dissipation (through the heat radiation plate). This multi-functionality eliminates the need for dedicated heat radiation components, reducing device complexity while achieving effective heat management
3Temperature
If conventional surface light-source device structures are used, then heat radiation is achieved, but the light sources cannot be replaced and the devices cannot be used for long period operation in machines
Solution Approach 1:
The device is segmented into modular components: a replaceable light source unit (containing the light emitting elements mounted on a substrate) and a permanent housing case with heat radiation plate. This segmentation allows the light sources to be independently removed and replaced without affecting the heat radiation structure or other components
Solution Approach 2:
The mounting structure for light sources is designed to be dynamically changeable - allowing easy insertion and removal of light source units. The substrate holder and associated mechanisms enable the light sources to transition between fixed operational positions and removable states, facilitating maintenance and replacement while maintaining effective heat radiation during operation
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
The solution effectively dissipates heat generated by point light sources, enabling efficient light emission and easy replacement of light sources, thus enhancing the reliability and longevity of the device.
Implementation Method 1
a light-guide plate arranged for receiving light, emitted from the point light sources, incident on at least one lateral side of the guide plate, and for emitting light from an emitting surface thereof perpendicular to the one lateral side
Implementation Method 2
Heat radiation performance can be enhanced in these prior point light-source devices, which brings the density of point light sources and current supplied to each of those to be increased
Data Source
AI summary
A surface light-source device includes: a plurality of point light sources; a light-guide plate arranged for emitting from its emitting surface the light incident on one lateral side thereof from the point light sources; a lower case having a lateral side formed approximately in parallel to the incident surface of the light-guide plate; and a light-source substrate on which the plurality of point light sources are arranged at predetermined intervals, disposed on the light-guide plate side. The surface light-source device is includes a substrate holder that clamps the light-source substrate and the lateral side of the lower case by projections arranged on the substrate holder between adjacent two of the light sources.