Illumination Device with Varying Diffusion Subelement Sizes
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Solution Overview
Problem
Existing illumination devices using laser light sources face complexity in adjusting partial ranges to higher or lower brightness within an illumination area without a complicated processing configuration, especially when continuously scanning the laser beam to change irradiation positions.
Innovation Solution
An illumination device with a coherent light source, optical diffusion subelements of varying sizes, and an optical scan unit that scans the coherent beam at a constant speed, allowing for adjustment of brightness by controlling the size of the incidence regions and maintaining constant output power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the output power of the laser beam is controlled to adjust brightness of partial ranges, then the illumination intensity can be adjusted, but the processing configuration becomes complicated
Solution Approach 1:
The patent applies local quality by making different parts of the optical element (diffusion subelements) have different sizes. Specifically, diffusion subelements corresponding to partial ranges requiring different brightness levels are designed with different sizes, allowing each subelement to naturally produce the desired illumination intensity without complex power control mechanisms.
Solution Approach 2:
The patent changes the physical parameter of the diffusion subelements (their sizes) to achieve different illumination intensities. By varying the size parameter of each diffusion subelement, the system can control the brightness of corresponding partial ranges in the illumination range without needing to adjust the laser beam output power dynamically.
2Adaptability or versatility
If the laser beam is scanned continuously to change irradiation positions, then the illumination range can be adjusted flexibly, but the output power control must be carried out according to the scan making the configuration complicated
Solution Approach 1:
The patent applies preliminary action by pre-configuring the sizes of diffusion subelements before the scanning operation. The varying sizes of diffusion subelements are determined in advance based on the desired brightness distribution, so that when the laser beam is scanned, the system can achieve the target illumination pattern without needing to perform complex real-time power control adjustments.
3Illumination intensity
If uniform brightness is required across the entire illumination range, then the laser beam must be applied uniformly to the entire optical element, but this cannot accommodate partial ranges requiring different brightness levels
Solution Approach 1:
The patent resolves this contradiction by making different parts of the optical element have different properties. Specifically, diffusion subelements are designed with varying sizes according to the brightness requirements of their corresponding partial ranges, enabling both uniform illumination where needed and differentiated brightness levels where required.
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
Enables precise illumination of partial ranges at higher or lower brightness without the need for complex processing configurations, by varying the size of the incidence regions on the diffusion subelements and maintaining constant output power and scan speed.
Implementation Method 1
an optical element having a plurality of diffusion subelements each of which guides the coherent beam incident thereon
Implementation Method 2
an optical scan unit that guides the coherent beam emitted from the coherent light source and thereby scans the coherent beam on the plurality of diffusion subelements
Data Source
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AI summary
Provided is an illumination device capable of illuminating a partial range in an illumination range at higher or lower brightness than the other ranges without the need of a complicated processing configuration. The illumination device includes a coherent light source that emits a coherent beam, an optical element 3 including a plurality of diffusion subelements 15-1 to 15-9 each of which guides the coherent beam incident thereon, such that the coherent beam illuminates a corresponding one of illumination object subregions 19-1 to 19-9, and an optical scan unit that guides the coherent beam emitted from the coherent light source and thereby scans the coherent beam on the plurality of diffusion subelements 15-1 to 15-9. The plurality of diffusion subelements 15-1 to 15-9 include diffusion subelements differing in size.