Lighting device
JP2024039646A5Pending Publication Date: 2026-07-01SCHOTT AG
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- SCHOTT AG
- Filing Date
- 2023-09-08
- Publication Date
- 2026-07-01
AI Technical Summary
Technical Problem
Existing laser-pumped light conversion elements suffer from reduced brightness due to light scattering caused by total internal reflection and large Fresnel reflections, which are exacerbated by high refractive indices, leading to inefficient light output and enlarged light spots.
Method used
The implementation of an optical element with a refractive index closely matched to the light conversion element, featuring oblique surfaces for secondary light transmission and reflection, minimizing total internal reflection and enhancing light output efficiency.
Benefits of technology
This approach increases the brightness of the emitted light by reducing light scattering and enlarging the light spot, allowing for more efficient utilization of the light source's output.
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Smart Images
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Abstract
To increase achievable luminance.SOLUTION: A lighting device comprises a light source for emitting primary light, a light conversion element, and an optical element (500) in which a first optical interface is formed between the light conversion element and itself, and which is made to adhere to the light conversion element so that secondary light from the light conversion element can be inputted therein at the first optical interface. The optical element has an outer surface which forms a second optical interface with respect to a peripheral medium, (a) the outer surface has at least one surface region obliquely extending to a front face of the light conversion element, and at the second optical interface, the secondary light becomes outputtable to the peripheral medium from the optical element in a direction having a smaller angle with respect to a normal line of the front face of the light conversion element than the case that the surface region extends in parallel with the front face of the light conversion element.SELECTED DRAWING: Figure 19
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