Laser Reflector Layout for Uniform Square Light Emission
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Solution Overview
Problem
Existing light-emitting devices struggle to achieve a uniform light intensity distribution and efficient light extraction from non-elongated shapes such as circles or squares, which limits their application in devices requiring compact and efficient light emission.
Innovation Solution
The light-emitting device incorporates a first and second semiconductor laser element, each with a light reflecting member having multiple inclined light reflecting surfaces, and a wavelength conversion member with an incident surface designed to receive and process light from these elements, ensuring a uniform light intensity distribution and efficient light extraction onto a small, non-elongated area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional light reflecting surfaces with three regions are used, then light intensity distribution is improved, but light extraction shape remains elongated and cannot be made compact
Solution Approach 1:
The light reflecting member is divided into four distinct light reflecting surfaces (first, second, third, and fourth surfaces) with different inclination angles. Each surface segment reflects light from different regions of the semiconductor laser element, collectively forming a compact square light extraction pattern instead of an elongated shape.
Solution Approach 2:
Each of the four light reflecting surfaces has a specific inclination angle tailored to reflect light from particular regions of the semiconductor laser element. The first and third surfaces have different inclination angles from the second and fourth surfaces, creating localized optical properties that collectively achieve uniform light distribution and compact shape.
2Illumination intensity
If multiple light reflecting surfaces are used to achieve uniform light distribution, then light intensity uniformity is improved, but device complexity increases
Solution Approach 1:
The four light reflecting surfaces are integrated into a single light reflecting member that is directly coupled to the semiconductor laser element. This merging of multiple reflecting surfaces into one component achieves uniform light distribution while avoiding the complexity of assembling multiple separate components.
Solution Approach 2:
The light reflecting member simultaneously performs multiple functions: it reflects light from different regions of the semiconductor laser element, shapes the light extraction pattern into a compact square, and ensures uniform light intensity distribution. This multi-functionality reduces the need for additional components.
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 achieves a 93% or more light output onto a 0.5 mm square region, effectively transforming the light extraction surface into a non-elongated shape, enhancing light efficiency and uniformity.
Implementation Method 1
The first light reflecting member has at least four light reflecting surfaces sequentially connected in an order of proximity to the first semiconductor laser element... Each part of a main portion of the first light emitted from the first semiconductor laser element is reflected by at least one of the at least four light reflecting surfaces of the first light reflecting member
Data Source
AI summary
A light-emitting device includes first and second semiconductor laser elements configured to respectively emit first and second lights, first and second light reflecting members each having at least four light reflecting surfaces, and a wavelength conversion member including an incident surface on which the reflected first light and the reflected second light are incident. Light intensity distributions in the fast axis direction of the first and second lights on the incident surface are more uniform than light intensity distributions in a fast axis direction of a far-field pattern of each of the first and second semiconductor laser elements. In a state in which the first and second lights are combined on the incident surface, 93% or more of a sum of light outputs of the first and second lights is emitted to a region of a 0.5 mm square on the incident surface.