Lightguide Lamp With Wavelength-Selective Crosstalk Filtering
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Solution Overview
Problem
Existing lighting systems are often complex and do not provide desirable optical effects or substantial Lambertian spatial power distribution.
Innovation Solution
A light generating system comprising a first and second light generating device, a lightguide element, and an optical filter, where the devices generate light that is coupled into the lightguide element via specific faces and escapes through controlled reflective elements, allowing for controlled light distribution and minimizing cross-talk, with a diffuse reflector promoting color mixing and a substantially Lambertian light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple light generating devices are used to achieve desirable optical effects and Lambertian spatial power distribution, then the optical performance is improved, but the device complexity increases
Solution Approach 1:
The system divides the light generation function into multiple independent light generating devices (first and second light generating devices), each responsible for specific optical effects. This segmentation allows complex optical performance to be achieved through simpler, dedicated components rather than a single complex device.
Solution Approach 2:
A lightguide element is introduced as an intermediary component that couples the light from multiple light generating devices and directs it through a diffuse reflector to achieve uniform Lambertian distribution. This intermediary simplifies the overall system architecture by providing a structured path for light management.
2Illumination intensity
If light is coupled into the lightguide element to control light distribution, then the spatial power distribution is improved, but cross-talk between light generating devices increases
Solution Approach 1:
The harmful cross-talk signal is extracted and isolated from the useful light path by using wavelength-selective optical filters. The filters allow the desired light from each device to pass while blocking the harmful cross-talk wavelengths, separating useful and harmful signals in the spectral domain.
Solution Approach 2:
Different regions of the optical system are assigned different spectral transmission properties through wavelength-selective filters. Each light generating device operates at specific wavelengths that are locally optimized for its function, preventing interference with other devices while maintaining overall system performance.
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 system provides a desirable flame shape perception, controlled light distribution, and minimizes cross-talk, achieving a substantially Lambertian light distribution with effective color mixing.
Implementation Method 1
a lightguide element configured to receive the first device light and the second device light
Implementation Method 2
an optical filter configured downstream of the first light generating device and upstream of the first outer face, wherein the optical filter has a higher transmission for the first luminescent material light than for a wavelength selected from the at least partially spectrally overlapping wavelength range (SO)
Implementation Method 3
a diffuse reflector promoting color mixing and a substantially Lambertian light distribution
Data Source
AI summary
The invention provides a light generating system (1000) comprising one or more light generating devices (100), a lightguide element (500), and an optical filter (450), wherein: (A) the one or more light generating devices (100) are configured to generate device light (101); (B) the lightguide element (500) comprises a light transmissive body (510) comprising light transmissive material (502), which is light transmissive for the device light (101); wherein the light transmissive body (510) comprises an axis of elongation (501) and a body length (L 1), wherein the light transmissive body (510) comprises a first end (511) and a second end (512); wherein the light transmissive body (510) comprises (i) a first outer face (521), comprised by the first end (511), (ii) a second outer face (522), comprised by the second end (512), and (iii) an external side face (523) bridging a distance between the first outer face (521) and the second outer face (521) and having a distance (d1) to the axis of elongation (501); (D) the optical filter (450) is configured downstream of the first light generating device (110) and upstream of the first outer face (521), wherein the optical filter (450) has a higher transmission for the first luminescent material light (211) than for a wavelength selected from the at least partially spectrally overlapping wavelength range (SO); and (E) the light generating devices (110,120) and the lightguide element (500), are configured such that (i) at least part of the device light (111,121) is coupled in the lightguide element (500) via the first outer face (521), (ii) at least part of the incoupled device light (111,121) escapes from the lightguide element (500) via the external side face (523) and/or via the second outer face (522).