Coherent Light Illumination Device Using Segmented Hologram Diffusion
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Solution Overview
Problem
Existing illumination devices using coherent light sources, such as lasers, face challenges in efficiently illuminating a desired area with a bright light distribution pattern due to prolonged light source emission control periods, leading to suboptimal performance and non-uniform illumination.
Innovation Solution
The illumination device employs a shaping optical system to divide and condense coherent light, using a lens array and collimation lens to create overlapping light fluxes, and an emission control unit to adjust light emission based on irradiation positions on a light diffusion device, which includes hologram storage media with element holograms, ensuring uniform illumination and efficient light utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the light source emission is controlled while changing the locations of multiple hologram devices to achieve desired light distribution pattern, then the illumination can be directed to prevent unintended area irradiation, but the light source stops emission for long periods resulting in insufficient utilization of light source performance and inadequate illumination brightness
Solution Approach 1:
The invention divides a single large hologram device into multiple small hologram devices (first, second, third, and fourth hologram devices). Each small hologram device can be independently positioned and controlled to receive laser light and diffract it into specific directions. This segmentation allows the illumination device to achieve desired light distribution patterns while maintaining continuous light source operation, as the light source can illuminate multiple small hologram devices in sequence or simultaneously without long stop periods.
2Adaptability or versatility
If multiple hologram devices are moved to different positions to control laser light irradiation, then the light distribution pattern can be adjusted, but the period of time when the light source stops emission becomes long reducing productivity
Solution Approach 1:
The invention employs a rotating support structure that dynamically positions multiple small hologram devices at different locations around the light source. The rotation mechanism allows the system to adaptively change which hologram devices receive laser light, enabling flexible control of illumination patterns. This dynamic positioning system maintains continuous light source operation while providing versatile light distribution control, as the rotating structure can quickly transition between different configurations without requiring light source stoppage.
3Device complexity
If a single large hologram device is used to cover the entire illumination area, then the structure is simpler, but the light flux is not uniform resulting in non-uniform illumination
Solution Approach 1:
Instead of using a single large hologram device, the invention employs multiple small hologram devices (first, second, third, and fourth hologram devices), each with a size smaller than the final illumination area. Each small hologram device receives a portion of the laser light and diffracts it into a specific direction. The superposition of light fluxes from multiple small hologram devices creates a uniform illumination pattern across the entire illumination area, while keeping each individual hologram device structurally simple and manageable.
4Use of energy by moving object
If the light flux from the light source is directly used without division, then the light source performance is maximized, but the illumination is non-uniform and speckle patterns occur
Solution Approach 1:
The invention divides the direct light flux from the laser light source into multiple separate light fluxes, each directed to a different small hologram device. The first, second, third, and fourth hologram devices each receive and diffract their respective light fluxes into different directions. The superposition of these diffracted light fluxes creates a uniform illumination pattern while maintaining efficient utilization of the light source. This segmentation approach also helps reduce speckle patterns by distributing the coherent light across multiple diffraction paths.
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
This approach allows for bright, uniform illumination of a desired light distribution pattern while efficiently utilizing the coherent light source, reducing the time required for emission and minimizing speckle patterns, thereby enhancing the overall performance and safety of the illumination device.
Implementation Method 1
an illumination device that illuminates a predetermined area by using light... using a coherent light source... A laser light source that oscillates laser light (laser beam) is typically used as the coherent light source
Implementation Method 2
The respective hologram devices diffract the laser light to achieve illumination in a desired light distribution pattern
Data Source
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AI summary
An illumination device (10) includes: a light diffusion device (50) including element diffusion devices (55) that diffuse incident light; a coherent light source (15) that emits coherent light; a shaping optical system (20) that shapes the coherent light; a scanner (30) that adjusts a traveling direction of the coherent light so as to allow the coherent light to scan the light diffusion device; and a light condensing optical system located on a light path of the coherent light from the shaping optical system up to the light diffusion device. The light condensing optical system condenses the coherent light such that a spot area on the light diffusion device is smaller than the element diffusion device. Each element diffusion device diffuses the coherent light incident thereon so as to illuminate an element illumination area corresponding to the element diffusion device.