Light Source Unit Ventilation for Heat Dissipation
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Solution Overview
Problem
Conventional semiconductor light source apparatuses face inefficiencies in cooling, particularly when a large number of light emitting elements are densely packed, leading to unstable light output and shortened lifetimes due to inadequate heat dissipation, especially in the inner portions of the light emitting element supporter.
Innovation Solution
A light source unit with a ventilating hole at the inner portion of the light emitting element supporter allows cooling air to directly reach the inner portions of the light emitting elements, enhancing cooling efficiency by supplying unheated air to the inner parts, while also using a heat sink and axial flow fan to dissipate heat effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a large number of light emitting elements are densely disposed on a plane to achieve small-sized light source or increase light quantity, then light quantity is improved, but cooling effect becomes insufficient leading to unstable light emitting quantity and short lifetime
Solution Approach 1:
The invention transitions from two-dimensional dense packing of light emitting elements to a three-dimensional arrangement where elements are disposed on the surface of a curved surface (convex or concave). This dimensional change allows improved heat dissipation while maintaining high light quantity output.
Solution Approach 2:
The invention applies different local qualities by creating regions with different densities of light emitting elements. Specifically, the density is set to be higher at peripheral portions and lower at central portions of the curved surface, optimizing both light output and cooling effectiveness in different areas.
2Reliability
If light emitting elements are arranged in a dispersed pattern on two dimensional direction, then ease of cooling is improved, but light quantity becomes insufficient for image projection apparatus
Solution Approach 1:
The invention moves from two-dimensional dispersed arrangement to three-dimensional configuration on a curved surface, enabling both adequate cooling and sufficient light quantity for image projection applications.
Solution Approach 2:
The invention changes the geometric parameters of the light emitting element arrangement by using a curved surface with specific radius of curvature (R1 or R2), optimizing both thermal management and light output parameters simultaneously.
3Quantity of substance
If inner portion of light emitting element supporter is surrounded by air warmed by light emitting elements, then heat accumulates in inner portion, but adding more elements increases light quantity requirement
Solution Approach 1:
By arranging light emitting elements on a curved surface rather than a flat plane, the invention creates improved air circulation patterns that prevent heat accumulation in the central region, even when numerous elements are used to increase light quantity.
Solution Approach 2:
The invention implements non-uniform density distribution where peripheral regions have higher element density and central regions have lower density, optimizing the balance between light quantity and heat management in different zones.
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 output and extends the lifetime of light emitting elements by improving cooling performance across the entire light source unit, ensuring efficient heat dissipation and maintaining high light emitting quantity.
Implementation Method 1
cooling air, supplied from a rear side of a light emitting side of the light emitting element assembly, passes through the ventilating hole to the light emitting side of the light emitting element assembly
Implementation Method 2
a heat dissipater such as a heat sink on a rear side of a light emitting element supporter
Implementation Method 3
air is supplied to the heat dissipater to cool the light emitting element assembly
Data Source
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AI summary
A light source unit (1) comprising a light emitting element supporter (13) to support a plurality of light emitting elements (11) disposed with a dispersed pattern in a two-dimensional direction as a light emitting element assembly, and light emitted from the light emitting element assembly exits to a target. The light emitting element supporter (13) includes a ventilating hole (2) at an inner portion of two dimensional direction of the light emitting element assembly, and cooling air, supplied from a rear side of a light emitting side of the light emitting element assembly, passes through the ventilating hole (2) to the light emitting side of the light emitting element assembly.