Light Emitting Device With Inclined Light Guide
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Solution Overview
Problem
Light emitting devices using laser elements face issues with uneven light distribution, which affects the consistency and quality of the emitted light.
Innovation Solution
A light emitting device design incorporating multiple semiconductor laser elements, a light-transmissive member with inclined surfaces, and a wavelength conversion member, where the laser beams enter through the inclined surfaces and exit from the lower surface, reducing unevenness by distributing light more evenly and allowing for effective heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple semiconductor laser elements are used to increase optical output, then power increases, but light distribution unevenness worsens
Solution Approach 1:
The light-transmissive member is divided into multiple regions, each corresponding to a semiconductor laser element. Each region includes inclined surfaces that independently guide light from specific laser elements, ensuring that even with multiple high-power elements, the light distribution remains uniform across the extraction surface.
Solution Approach 2:
Different regions of the light-transmissive member have optimized local structures tailored to their corresponding laser elements. The inclined surfaces in each region are configured to redirect light from specific laser elements at appropriate angles, creating locally optimized light extraction that collectively achieves uniform overall distribution while supporting high total power output.
2Power
If high-power laser elements are used to increase optical output, then power increases, but heat generation increases
Solution Approach 1:
The patent introduces a three-dimensional light guiding structure using inclined surfaces within the light-transmissive member. This spatial configuration redirects light paths through multiple reflections and refractions, increasing the effective light extraction area and reducing heat concentration in any single region, thereby enabling high-power operation with improved thermal management.
3Reliability
If light enters through inclined surfaces to reduce unevenness, then light distribution uniformity improves, but device complexity increases
Solution Approach 1:
The light-transmissive member serves multiple functions simultaneously: it acts as a structural support, a heat dissipation pathway, and most importantly, an integrated light guiding and distributing system. The inclined surfaces are formed as part of the member's basic structure rather than as separate components, achieving uniform light distribution without adding significant device complexity.
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 reduces light distribution unevenness and allows for higher optical output by ensuring consistent light distribution and efficient heat management, enabling the use of high-power laser elements.
Implementation Method 1
The light-transmissive member includes a plurality of first inclined surfaces and a lower surface. The light-transmissive member is positioned with respect to the semiconductor laser elements so that beams of the light emitted from the semiconductor laser elements enter the light-transmissive member respectively through the first inclined surfaces and exit from the lower surface.
Implementation Method 2
The wavelength conversion member is disposed in contact with the lower surface of the light-transmissive member and configured to convert at least a portion of the light exiting from the lower surface to wavelength-converted light having a second wavelength.
Data Source
AI summary
A light emitting device includes a plurality of semiconductor laser elements, a light-transmissive member, and a wavelength conversion member. Each of the semiconductor laser elements is configured to emit light having a first wavelength. The light-transmissive member includes a plurality of first inclined surfaces and a lower surface. The light-transmissive member is positioned with respect to the semiconductor laser elements so that beams of the light emitted from the semiconductor laser elements enter the light-transmissive member respectively through the first inclined surfaces and exit from the lower surface. The wavelength conversion member is disposed in contact with the lower surface of the light-transmissive member and configured to convert at least a portion of the light exiting from the lower surface to wavelength-converted light having a second wavelength.