Oblique Laser Arrangement in Light Source Device
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Solution Overview
Problem
Existing light source devices with semiconductor lasers face challenges in achieving uniform light emission with minimal optical loss, often requiring larger optical members to mix light effectively, leading to increased device size and loss in optical output.
Innovation Solution
A light source device design featuring a package with semiconductor lasers arranged obliquely to their adjacent inner lateral surfaces, a light-transmissive cover, and an optical member configured to mix light, where the inner lateral surfaces have a reflecting region inclined to direct laser light through the cover and hit the optical member, allowing for efficient light mixing and emission with reduced optical loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a reflecting surface is formed at 45 degrees to direct light perpendicular to the substrate, then good directivity and ease of handling are achieved, but the optical member cannot obtain sufficient reflection for uniform light mixing, and a longer optical member is needed resulting in larger device size and optical output loss
Solution Approach 1:
The patent applies asymmetry by forming the reflecting surface at an angle different from the conventional 45 degrees. Specifically, the reflecting surface is formed at an angle of 30 to 60 degrees (excluding 45 degrees) relative to the laser light incident direction. This asymmetric angle optimization allows the optical member to achieve sufficient light reflection and uniform mixing within a shorter length, thereby reducing device size while maintaining effective light mixing performance.
2Ease of operation
If a reflecting surface is formed at 45 degrees to direct light perpendicular to the substrate, then good directivity is achieved, but a longer optical member is needed for sufficient light mixing, causing loss in optical output
Solution Approach 1:
The patent applies asymmetry by forming the reflecting surface at an angle different from the conventional 45 degrees. Specifically, the reflecting surface is formed at an angle of 30 to 60 degrees (excluding 45 degrees) relative to the laser light incident direction. This asymmetric angle optimization allows the optical member to achieve sufficient light reflection and uniform mixing within a shorter length, thereby reducing device size while maintaining effective light mixing performance.
Solution Approach 2:
The patent applies parameter changes by optimizing the angle of the reflecting surface. The angle is specifically set between 30 to 60 degrees (excluding 45 degrees), which maximizes the reflection efficiency within the optical member. This parameter optimization ensures that light undergoes sufficient reflections for uniform mixing while minimizing the required optical member length, thus reducing optical output loss.
3Manufacturing precision
If the optical member is made longer to achieve sufficient reflection for uniform light mixing, then uniform light can be obtained, but the device size increases
Solution Approach 1:
The patent applies asymmetry by forming the reflecting surface at an angle different from the conventional 45 degrees. Specifically, the reflecting surface is formed at an angle of 30 to 60 degrees (excluding 45 degrees) relative to the laser light incident direction. This asymmetric angle optimization allows the optical member to achieve sufficient light reflection and uniform mixing within a shorter length, thereby reducing device size while maintaining effective light mixing performance.
Solution Approach 2:
The patent applies parameter changes by optimizing the angle of the reflecting surface. The angle is specifically set between 30 to 60 degrees (excluding 45 degrees), which maximizes the reflection efficiency within the optical member. This parameter optimization ensures that light undergoes sufficient reflections for uniform mixing while minimizing the required optical member length, thus reducing optical output loss.
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 enables a compact light source device that emits uniform light with minimal optical loss, achieving sufficient light mixing even with a shorter optical member, thus reducing device size and optical output loss.
Implementation Method 1
the inner lateral surface has a reflecting region arranged inclined with respect to the inner bottom surface so that, in terms of the optical axis, laser light emitted from each of the one or more semiconductor laser elements is directed to pass through the cover and hit an inner surface of the optical member
Data Source
AI summary
A light source device includes a package, one or more semiconductor lasers each having an emission surface, a light-transmissive cover, and an optical member. The package includes an inner bottom surface and inner lateral surfaces, and a recess defined by the inner bottom surface and the inner lateral surfaces and having an open end. The one or more semiconductor lasers are arranged on the inner bottom surface. The light-transmissive cover covers the open end of the recess. The optical member is arranged on an upper surface of the cover and is configured to mix light. The one or more semiconductor lasers are arranged so that their emission surfaces are respectively oblique to their adjacent inner lateral surface when viewed from above, and the inner lateral surface has a reflecting region arranged inclined with respect to the bottom surface.