Illumination Device Optical Film and Diffusing Structure
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Solution Overview
Problem
Traditional illumination devices using laser beams suffer from color unevenness due to the high directivity of the laser beam, which is not desirably mixed with the diffused wavelength-converted light, leading to a narrow color range of the mixed light.
Innovation Solution
The illumination device incorporates a housing with a wavelength converting component, an optical film with specific transmittance properties, and a light diffusing structure on the inner walls of the housing. The optical film ensures high transmittance for wavelength-converted light while maintaining low transmittance for the laser beam, and the light diffusing structure diffusely reflects the laser beam to reduce directivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the laser beam is used directly without diffusion, then the illumination intensity is high, but color unevenness occurs due to high directivity
Solution Approach 1:
The patent separates the diffusion function from the wavelength conversion function by introducing a dedicated light diffusing structure. This segmentation allows the laser beam to be diffused independently before or after wavelength conversion, preventing color unevenness while maintaining high illumination intensity. The diffusing structure is distinct from the wavelength converting component, enabling independent optimization of each function.
Solution Approach 2:
The patent introduces a light diffusing structure as an intermediary element between the laser beam source and the final illumination output. This intermediary component specifically targets the directivity issue by diffusing the laser beam without interfering with the wavelength conversion process, thereby resolving color unevenness while preserving illumination intensity.
2Stability of the object's composition
If a light diffusing structure is introduced to reduce directivity, then color uniformity improves, but light extraction efficiency may decrease
Solution Approach 1:
The patent applies light diffusing structures selectively in specific regions where diffusion is needed, rather than uniformly across the entire optical path. This local application of diffusion ensures color uniformity is improved in critical areas while minimizing unnecessary light loss. The wavelength converting component maintains its original properties in regions where diffusion is not required.
Solution Approach 2:
The patent employs a light diffusing structure with controllable diffusion characteristics that can be optimized dynamically. The diffusing properties are tailored to match the specific requirements of the laser beam parameters and wavelength conversion characteristics, allowing for maximum light extraction efficiency while achieving the desired color uniformity.
3Stability of the object's composition
If the laser beam is diffused before wavelength conversion, then color uniformity improves, but the wavelength conversion efficiency decreases
Solution Approach 1:
The patent inverts the conventional sequence by performing wavelength conversion first and then diffusion, rather than diffusing before conversion. This reversal ensures that the laser beam maintains its high intensity and coherence during the wavelength conversion process, maximizing conversion efficiency. The diffusion step is applied afterward to achieve color uniformity without compromising the conversion efficiency.
4Stability of the object's composition
If the wavelength converting component is used to diffuse the laser beam, then directivity is reduced, but the absorptivity of the wavelength converting component decreases
Solution Approach 1:
The patent segments the diffusion function from the wavelength conversion function, using a dedicated light diffusing structure instead of relying on the wavelength converting component for diffusion. This segmentation preserves the absorptivity of the wavelength converting component by eliminating the need for it to provide both wavelength conversion and diffusion functions simultaneously.
Solution Approach 2:
The patent introduces a light diffusing structure as an intermediary that handles the diffusion task separately from the wavelength converting component. This intermediary structure reduces the directivity of the laser beam without requiring the wavelength converting component to sacrifice its absorptivity, as the diffusion function is performed by a specialized component designed solely for that purpose.
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 configuration reduces color unevenness of the illumination light without compromising light extraction efficiency, enabling a wide color range for the mixed light, thus enhancing the freedom of color design.
Implementation Method 1
a wavelength converting component 20 which is disposed inside the housing 10 and radiates wavelength-converted light after a laser beam enters the wavelength converting component 20
Implementation Method 2
an optical film 30 which covers the opening portion 10a, the optical film 30 having optical properties such that a transmittance for the wavelength-converted light is 80% or more and a transmittance for the laser beam at a peak wavelength is 80% or less of a transmittance for the wavelength-converted light at a peak wavelength
Implementation Method 3
a light diffusing structure 40 which is disposed on at least part of an inner wall of the housing 10 and diffusely reflects the laser beam reflected by at least the optical film 30
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
An illumination device (1) includes a housing (10) including an opening portion (10a), a wavelength converting component (20) which is disposed inside the housing (10) and radiates wavelength-converted light having a different wavelength from that of a laser beam after the laser beam enters the component (20), an optical film (30) which covers the opening portion (10a) and has optical properties such that the transmittance for the wavelength-converted light is 80% or more and the transmittance for the laser beam at the peak wavelength is 80% or less of the transmittance for the wavelength-converted light at the peak wavelength, and a light diffusing structure (40) which is disposed on at least part of the inner wall of the housing (10) and diffusely reflects the laser beam reflected at least by the optical film (30).