Surface-Emitting Laser Package With Diffusion and Reflective Resin
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Solution Overview
Problem
Existing semiconductor light emitting devices face challenges in achieving both high output and wide directional angle of emitted light, while minimizing absorption of laser light by the device's components.
Innovation Solution
The semiconductor light emitting device incorporates a surface emitting laser element, an element container with a bottom wall and peripheral wall, a diffusion layer with diffusion materials, and a reflector made of a high reflectivity resin material. The reflector covers at least one of the bottom wall or peripheral wall to reflect diffused laser light, preventing absorption and enhancing light output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the device components are used to emit light, then light output is achieved, but absorption of laser light occurs reducing overall efficiency
Solution Approach 1:
The patent converts the harmful absorption of laser light by device components into a beneficial effect by introducing a reflector that redirects absorbed or scattered light back toward the emission direction. The reflector transforms energy that would be lost through absorption into useful light output, thereby converting a harmful factor into a benefit.
Solution Approach 2:
The device is segmented into distinct functional components: a light emitting element, a diffusion layer for light scattering, and a reflector for light redirection. This segmentation allows each component to perform its specific function optimally, with the reflector specifically addressing the energy loss problem by separating the light management function from the structural support function.
2Illumination intensity
If high light output is achieved, then brightness is improved, but directional angle becomes narrow
Solution Approach 1:
The lighting function is segmented into two distinct components: a diffusion layer that provides wide angular distribution and a reflector that maintains high intensity. This segmentation allows the device to achieve both wide directional angle and high brightness simultaneously, as each component optimizes for its specific function without compromising the other.
Solution Approach 2:
The diffusion layer acts as an intermediary between the light emitting element and the reflector. It scatters the light to create a wide directional angle while the reflector subsequently redirects these scattered rays to maintain high intensity. This intermediary structure enables the transition from concentrated to distributed light while preserving overall brightness.
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 allows for a high output and wide directional angle of the emitted light, while effectively reducing absorption of laser light by the device's components, thereby improving the overall light output of the semiconductor light emitting device.
Implementation Method 1
a reflector made of a high reflectivity resin material... The reflector covers at least one of the bottom wall or peripheral wall to reflect diffused laser light
Implementation Method 2
a diffusion layer with diffusion materials... diffused laser light... wide directional angle of the emitted light
Data Source
AI summary
A semiconductor light emitting device includes: a surface emitting laser element including an element front surface and configured to emit laser light from the element front surface; an element container including a bottom wall where the surface emitting laser element is arranged and a peripheral wall surrounding the surface emitting laser element when viewed from a direction perpendicular to the element front surface, the bottom wall and the peripheral wall constituting a containing space which contains the surface emitting laser element and is open on a same side as the element front surface; a diffusion layer covering the element front surface in the containing space and including a diffusion material; and a reflector covering at least one selected from the group of the bottom wall and the peripheral wall in the containing space and made of a resin material having a higher reflectivity than the diffusion layer.