Light-Emitting Device with Prismatic Reflective Lamellae
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Solution Overview
Problem
Existing light emitting devices with lamellae suffer from significant power losses due to absorption, necessitating an improvement in efficiency.
Innovation Solution
A light emitting device with specular reflective lamellae featuring prismatic elements on both major surfaces, configured to reflect light in desired directions, eliminating the need for separate reflectors and enhancing collimation and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If absorbing lamellae are used to collimate light in a narrow beam, then the light beam directionality is improved, but significant power loss occurs due to absorption
Solution Approach 1:
The patent inverts the conventional approach by replacing absorbing lamellae with specular reflective lamellae. Instead of absorbing light and re-emitting it in desired directions, the reflective lamellae use specular reflection to redirect light, thereby eliminating absorption losses while maintaining beam collimation capability
Solution Approach 2:
The patent substitutes the absorption-reemission mechanism with a reflection-based optical mechanism. The specular reflective surfaces with prismatic elements redirect light through geometric reflection rather than thermal absorption and re-emission, reducing energy loss
2Loss of energy
If separate reflectors are added to reduce power losses, then energy efficiency is improved, but device complexity increases
Solution Approach 1:
The patent merges the collimation function and the reflection function into a single integrated component. The specular reflective lamellae with prismatic elements simultaneously perform light redirection and collimation, eliminating the need for separate reflectors and reducing structural complexity
Solution Approach 2:
The lamellae structure serves multiple functions: it acts as both the collimating element and the reflective element. The prismatic elements on the specular reflective surfaces provide both geometric configuration for collimation and high reflectivity for energy efficiency
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 device achieves a narrow and well-collimated light beam with reduced power losses, suitable for ceiling-mounted disinfection systems, and is more cost-effective to produce.
Implementation Method 1
each of the at least two lamellae comprises a first major surface being specular reflective and extending in a direction being parallel with a center axis of a main issue direction of light by the light emitting device and facing the spacing, and where each of the at least two lamellae comprises a first plurality of prismatic elements arranged on the first major surface such that at the first major surface light is reflected by the first plurality of prismatic elements
Data Source
Figure 1~2a
Figure 2b~3
Figure 4~5
AI summary
A light emitting device (1) comprising at least one light source (2) adapted for, in operation, emitting light source light, a cavity (3) being diffusely reflective and comprising a light exit plane (6), the at least one light source (2) being arranged in the cavity (3), and at least two lamellae (41, 42) arranged extending from a position level with the light exit plane (6) and away from the cavity (3), the at least two lamellae (41, 42) being spaced apart by a spacing (9), wherein each of the at least two lamellae (41, 42) comprises a first major surface (411, 421) being specular reflective and extending in a direction being parallel with a center axis (A) of a main issue direction of light emitted by the light emitting device (1) and facing the spacing (9), and wherein at least one of the at least two lamellae (41, 42) comprises a first plurality of prismatic elements (51, 52) arranged on the first major surface (411, 421) such that at the first major surface (411, 421) light is reflected by the first plurality of prismatic elements.