Lateral-Emission Light Source Layout With Recessed Reflector Alignment
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Solution Overview
Problem
Existing light emitting devices face challenges in accurately arranging light emitting elements and reflective members due to variations in height, which affect the mounting positions and overall precision of the components.
Innovation Solution
A light emitting device design featuring a base with a recess and a flat upper surface, where the light emitting element emits light laterally and the reflective member is positioned on the upper surface with its reflective surface configured to reflect light upward, overlapping with the recess in a top view, allowing for precise alignment and reduced size and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the laser oscillation unit and reflective member are disposed on different surfaces of the substrate, then the structural design is flexible, but the height variations affect the mounting positions and arrangement accuracy
Solution Approach 1:
The reflective member is positioned at a different height level than the light emitting element by utilizing the recess structure. The reflective member is disposed on the bottom surface of the recess while the light emitting element is on the upper surface, creating a vertical dimension separation that allows both components to be precisely positioned despite height variations in the substrate.
Solution Approach 2:
The reflective member is nested within the recess structure of the substrate. The recess provides a dedicated space that accommodates the reflective member at a lower level, allowing it to be integrated into the overall structure without interfering with the light emitting element's position on the upper surface.
2Reliability
If additional mounting components such as submounts are used, then the components can be securely mounted, but the device size and structural complexity increase
Solution Approach 1:
The substrate integrates multiple functions: it serves as the mounting base for the light emitting element on its upper surface, provides the recess structure for accommodating the reflective member, and acts as the overall structural support. This merging of functions eliminates the need for separate submounts and additional mounting components.
Solution Approach 2:
The substrate is designed as a multi-functional component that simultaneously provides mechanical support, defines the positioning of the light emitting element, and creates the recess structure for the reflective member. This universal design reduces the total number of components needed in the device.
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 design enables high-accuracy arrangement of light emitting elements and reflective members, improving light reflection and reducing device size and complexity by eliminating the need for additional mounting components, such as submounts.
Implementation Method 1
a reflective member that is disposed on the upper surface of the base to face the light emitting element with the recess interposed between the reflective member and the light emitting element, and that has a reflective surface configured to reflect the light upward
Data Source
AI summary
A light emitting device includes: a base having a recess and a flat upper surface; a light emitting element disposed on the upper surface of the base and configured to emit light laterally from an emission end surface; and a reflective member disposed on the upper surface of the base to face the light emitting element with the recess located between part of the reflective member and the light emitting element in a top view, the reflective member having a reflective surface configured to reflect the light upward. At least a portion of the reflective surface overlaps with the recess in the top view. A lower end of the reflective surface is located lower than the upper surface of the base and higher than a bottom surface of the recess in a direction normal to the upper surface of the base.