Semiconductor Laser Submount Layout for Surge-Protected Light Emission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing light-emitting modules face challenges in optimizing the mounting aspects of multiple light-emitting elements, particularly in achieving efficient light emission and protection against surge voltages.
Innovation Solution
A light-emitting module design featuring a base with specific arrangements of submounts and protective elements, where semiconductor laser elements are positioned closer to one lateral surface and protected by Zener diodes, with reflective members and optical components to enhance light emission and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple light-emitting elements are mounted on a single wiring substrate, then the light emission capability is improved, but the mounting complexity and space utilization are worsened
Solution Approach 1:
The patent divides the light-emitting elements into two separate groups: those mounted on the first wiring substrate and those mounted on the second wiring substrate. This segmentation allows each substrate to be optimized independently for its specific mounting requirements, reducing overall mounting complexity while maintaining high light emission capability.
Solution Approach 2:
The patent transitions from a single-plane mounting approach to a multi-layer three-dimensional arrangement by stacking the first and second wiring substrates at different heights. This dimensional change enables better space utilization and reduces mounting complexity by distributing elements across multiple layers rather than crowding them on a single substrate.
2Reliability
If protective elements are arranged closer to the light-emitting elements, then the protection effectiveness is improved, but the space for light emission is reduced
Solution Approach 1:
The patent positions protective elements on the second wiring substrate, which is arranged at a different height (in the vertical dimension) from the first wiring substrate containing the light-emitting elements. This three-dimensional arrangement allows the protective elements to be spatially close to the light-emitting elements for effective protection while maintaining sufficient horizontal space on each substrate for optimal light emission.
Solution Approach 2:
The second wiring substrate acts as an intermediary layer between the light-emitting elements on the first substrate and the protective elements. This intermediate structure enables the protective elements to be positioned close to the light-emitting elements for effective protection while maintaining adequate emission space through the vertical separation provided by the substrate thickness.
3Manufacturing precision
If the submounts are arranged with specific orientation, then the manufacturing precision is improved, but the design flexibility is reduced
Solution Approach 1:
The patent specifies that the submounts have a predetermined orientation with their first lateral surfaces aligned in a first direction and their lengths in a second direction perpendicular to the first direction. This asymmetric, oriented arrangement improves manufacturing precision by providing clear alignment references during assembly, while the standardized orientation actually enhances design flexibility by enabling consistent, repeatable manufacturing processes across different configurations.
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 design achieves effective light emission and protection against surge voltages, enhancing the performance and reliability of the light-emitting module.
Implementation Method 1
the laser element can be protected from a surge voltage or the like by arranging the Zener diode
Implementation Method 2
a plurality of semiconductor laser elements arranged on the plurality of submounts different from each other
Data Source
AI summary
A light-emitting device includes a base, a plurality of submounts, a plurality of semiconductor laser elements, and a plurality of protective elements. The submounts include first and second lateral surfaces, are arranged such that the first lateral surface is aligned in a first direction on an upper surface of the base, and have a length in a second direction perpendicular to the first direction in a top view greater than a length in the first direction. The semiconductor laser elements are arranged on the submounts different from each other such that the light-emitting surface is in a position closer to the first lateral surface than the second lateral surface. The protective elements are each arranged on the submounts different from each other in a position in which a distance to the second lateral surface is shorter than a distance from the semiconductor laser element to the second lateral surface.