Laser Lighting Device Speckle Control for Dynamic Sparkling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional lighting devices often fail to provide a sparkling effect with sufficient power, limiting their application in showrooms, showcases, and stage lighting where a lively and dynamic illumination is desired.
Innovation Solution
A lighting device comprising a laser light source and a speckle control element, along with a control system that adjusts the coherence length and speckle contrast, allowing for dynamic control of the speckle distribution and intensity to create a sparkling effect, which can be tailored to the surface roughness and application requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional lighting devices are used, then the lighting is stable and uniform, but the sparkling effect is insufficient and power is too low
Solution Approach 1:
The patent applies dynamics by making the diffusor element movable rather than static. The diffusor can rotate or vibrate to dynamically modulate the speckle pattern, transforming the harmful static speckle into a dynamic sparkling effect that enhances visual appeal while maintaining controllable intensity
Solution Approach 2:
The patent changes physical parameters by adjusting the diffusor's rotation speed, vibration frequency, or position to control the degree of speckle modulation. This allows continuous adjustment of the sparkling effect intensity and characteristics to match different application requirements
2Illumination intensity
If a laser light source is used, then high brightness and coherence are achieved, but speckle formation occurs which may be harmful
Solution Approach 1:
The patent converts the harmful speckle pattern generated by laser coherence into a beneficial sparkling effect. By using a movable diffusor to modulate the speckle, the previously unwanted coherence artifact becomes the desired visual feature for decorative and atmospheric lighting applications
3Illumination intensity
If the coherence length is increased, then laser brightness is enhanced, but speckle contrast increases which may be undesirable
Solution Approach 1:
The patent introduces a movable diffusor as an intermediary element between the laser source and the target surface. This diffusor mediates the interaction between coherent light and the illuminated surface, allowing control over speckle contrast while preserving laser brightness through dynamic scattering modulation
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 enables the creation of a high-intensity, dynamic sparkling effect that can be adjusted for various lighting applications, providing a more engaging and lively illumination in environments like showrooms and stage lighting.
Implementation Method 1
at least one source giving stimulated emission where the coherence length of the light can be (gradually) adjusted
Implementation Method 2
the speckle control element is configured in an optical path of the first laser light source light for providing the lighting device light comprising a speckle distribution of the first laser light source light
Implementation Method 3
For applications such as shop lighting and stage lighting speckle can give a sparkling appearance
Data Source
AI summary
The invention provides a lighting device (1000) configured to generate lighting device light (1001), wherein the lighting device (1000) comprises (i) a first laser light source (10) configured to generate a beam (15) of first laser light source light (11), (ii) a speckle control element (30), and (iii) a control system (50), wherein in one or more control modes of the control system (50) the speckle control element (30) is configured in an optical path (16) of the first laser light source light (11) for providing the lighting device light (1001) comprising a speckle distribution (35) of the first laser light source light (11), wherein at a predetermined distance L from the lighting device (1000) the speckle distribution (35) has a first speckle contrast value C1 selected from the range of 3%<C1<100%, wherein the predetermined distance L is selected from the range of 0.5-50 m, and wherein the control system (50) is further configured to dynamically control with the speckle control element (30) the first speckle contrast value C1 in one or more of the one or more control modes.