Transmissive Fluorescent Body Laser Light Source Luminance
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Solution Overview
Problem
Existing light source devices face challenges in achieving high luminance due to scattering of laser light within fluorescent bodies containing binders like resin, and single crystal fluorescent bodies alone do not efficiently emit light when irradiated with laser light.
Innovation Solution
A light source device featuring a transmissive fluorescent body with a condensing lens that concentrates laser light inside the body, minimizing scattering and enhancing energy density, allowing efficient emission of fluorescent light. This includes a light source unit emitting blue laser light, a condensing lens, and a transmissive fluorescent body, such as a single crystal or ceramic, with a shape like a sphere or polyhedron, where the laser light is concentrated to a specific point within the body to maximize luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If fluorescent bodies containing binders like resin are used, then the fluorescent body can be easily manufactured, but laser light is scattered inside the fluorescent body reducing luminance
Solution Approach 1:
The invention extracts and removes the binder (resin) component from the fluorescent body, using only the fluorescent material itself. This eliminates the scattering problem caused by binders while maintaining the ease of manufacture through simple sintering processes for ceramic fluorescent bodies or crystal growth for single crystals.
Solution Approach 2:
The invention uses composite material structures where fluorescent particles are densely packed or formed as single crystals/ceramics without binder materials. This creates a homogeneous medium that allows laser light to pass through with minimal scattering while maintaining fluorescent emission properties.
2Illumination intensity
If a single crystal fluorescent body is used, then laser light scattering is reduced, but luminance is still insufficient without additional structures
Solution Approach 1:
The invention introduces a spatial dimension by positioning a condensing lens between the laser source and fluorescent body to concentrate laser light into a focal point within the fluorescent material. This dimensional adjustment (adding optical focusing) dramatically increases luminance without complicating the fluorescent body structure itself.
Solution Approach 2:
The invention applies local quality by creating a concentrated high-energy region (focus point) within the fluorescent body where laser light is condensed. This localized energy concentration maximizes fluorescent emission at the focal point while keeping the rest of the system simple.
3Illumination intensity
If laser light is condensed to a point inside the fluorescent body, then luminance is maximized, but precise positioning is required
Solution Approach 1:
The invention employs self-service through the inherent optical properties of the fluorescent body. The material's refractive index and optical homogeneity automatically guide and concentrate the laser light to the focal point without requiring complex alignment mechanisms or high-precision positioning structures.
Solution Approach 2:
The invention utilizes parameter changes in the optical properties of the fluorescent body (refractive index, optical homogeneity) to achieve light concentration. By selecting materials with appropriate optical parameters, the system achieves precise light focusing through natural optical paths rather than mechanical positioning.
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 solution results in a light source with higher luminance compared to conventional devices, as the fluorescent light is efficiently emitted along the laser light propagation direction without significant scattering, enabling better light extraction and directionality.
Implementation Method 1
a condensing lens, and a transmissive fluorescent body. The condensing lens condenses laser light emitted from the light source unit
Implementation Method 2
The transmissive fluorescent body is provided with, inside thereof, a condensing point of laser light condensed by the condensing lens, and emits fluorescent light from a portion through which laser light passes
Data Source
AI summary
A light source device includes a light source unit that emits laser light, a condensing lens, and a transmissive fluorescent body. The condensing lens condenses laser light emitted from the light source unit. The transmissive fluorescent body is provided with, inside thereof, a condensing point of laser light condensed by the condensing lens, and emits fluorescent light from a portion through which laser light passes.