Surface-Emitting Laser Diffuser Layout to Limit Adhesive Light Loss
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Solution Overview
Problem
Conventional surface-emitting laser packages experience light loss due to the absorption of light by the diffuser and the penetration of the adhesive member into the diffuser, leading to reduced light output.
Innovation Solution
A surface-emitting laser package design that includes a diffusing part with a pattern array spaced apart from the housing, where the height of the pattern array is less than half the distance between the laser device and the diffusing part, and the width is larger than the light emitting region, optimizing the shape of the diffusing part to improve light output and prevent adhesive spreading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a diffuser is attached to a housing by using an adhesive member, then the diffuser can be fixed in position, but the adhesive member penetrates into the inside along one surface of the diffuser to cause light loss
Solution Approach 1:
The diffuser is divided into a light incident surface and a light emitted surface, with the adhesive member applied only to the light emitted surface. This segmentation prevents the adhesive from interfering with light transmission while maintaining structural stability.
Solution Approach 2:
The adhesive member is selectively applied only to specific regions of the diffuser (the light emitted surface) rather than the entire surface. This local application ensures proper positioning without allowing adhesive penetration into the light path, thus maintaining light output.
2Illumination intensity
If the diffuser is made larger to cover the light emitting region, then light distribution is improved, but the adhesive member has more surface area to spread and penetrate
Solution Approach 1:
The diffuser is designed with different surface properties: the light incident surface has minimal adhesive application area, while the light emitted surface provides adequate coverage for light distribution. This localized quality control ensures both good light distribution and minimal adhesive interference.
Solution Approach 2:
The diffuser surface is functionally segmented into light reception and light emission zones, with adhesive application restricted to the emission zone. This allows the diffuser to be sufficiently large for good light distribution without increasing adhesive penetration risk in the light path.
3Strength
If the adhesive member is applied generously to ensure strong bonding, then the diffuser is securely fixed, but the adhesive spreads within the beam viewing angle causing light loss
Solution Approach 1:
The adhesive member is applied with controlled quantity and specific location (only on the light emitted surface), providing sufficient bonding strength while preventing spread into the beam viewing angle. This localized control resolves the contradiction between bonding strength and light output.
Solution Approach 2:
The harmful effect of adhesive penetration is eliminated by extracting the adhesive application from the light incident surface and confining it to the light emitted surface. This removal of adhesive from critical light paths prevents light loss while maintaining bonding function.
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 optimized diffusing part design enhances light output by controlling the adhesive spread and reducing light loss within the beam viewing angle, resulting in improved light distribution and efficiency.
Implementation Method 1
a diffusing part disposed on the surface-emitting laser device. The light emitting region has a first width in a first direction and a second width in a second direction perpendicular to the first direction, and the second width may be larger than the first width. The diffusing part outputs the first laser beam as a second laser beam having a first viewing angle in the first direction and a second viewing angle in the second direction
Data Source
AI summary
A surface-emitting laser package comprises: a substrate; a surface-emitting laser device disposed on the substrate, and having a non-emitting area and an emitting area which includes a plurality of emitters each generating a first laser beam; a housing disposed around the surface-emitting laser device; and a diffusing part disposed on the surface-emitting laser device. The emitting area has a first width in a first direction and a second width in a second direction perpendicular to the first direction, and the second width may be greater than the first width. The diffusing part outputs the first laser beam into a second laser beam having a first angle of view in the first direction and a second angle of view in the second direction, and the first angle of view may be greater than the second angle of view.