White LED Lighting Device with Positionable Optical Filters
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Solution Overview
Problem
Current LED lighting devices for medical settings, such as operating theaters, lack the ability to adjust spectral characteristics like color temperature without reducing visible illumination and are prone to color temperature shifts when obstacles block light, leading to undesirable rainbow effects and shadows.
Innovation Solution
An LED lighting device with a power supply unit that adjusts power supply currents to white LEDs through a system of positionable optical filters with different transmission coefficients, allowing for adjustable color temperature and chromatic coordinates without reducing light flux, and incorporating 'cold' and 'blue' filters to manage radiant energy and photobiological risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If optical filters are placed in front of white LEDs to adjust color temperature, then spectral characteristics become adjustable, but light flux is reduced
Solution Approach 1:
The patent implements dynamic control by making the optical filter system adjustable and reconfigurable. Multiple optical filters with different transmission characteristics can be selectively positioned in front of different LED groups, allowing dynamic adjustment of color temperature and spectral composition without permanently reducing light flux. The system adapts to different surgical requirements by changing filter configurations in real-time.
Solution Approach 2:
The patent changes physical parameters by using optical filters with specific transmission coefficients to modify the spectral characteristics of LED light. By selecting filters with appropriate transmission properties for different wavelength ranges, the system adjusts color temperature and chromatic coordinates while compensating for light flux reduction through coordinated control of multiple LED groups.
2Adaptability or versatility
If multiple colored LEDs are used to achieve desired color temperature, then spectral characteristics can be adjusted, but device complexity increases
Solution Approach 1:
The patent divides the lighting system into multiple independent LED groups, each equipped with its own optical filter. This segmentation allows each group to be controlled independently, simplifying the overall control architecture while achieving complex spectral adjustment capabilities. Each segment can be optimized for specific wavelength ranges, reducing the need for a single complex multi-color LED system.
Solution Approach 2:
The patent makes each LED group multi-functional by equipping it with optical filters that can adjust its output characteristics. Instead of requiring separate dedicated LEDs for each color temperature, the same LED groups can serve multiple functions by changing filter configurations, thereby reducing device complexity while maintaining spectral adjustability.
3Adaptability or versatility
If obstacles block light flux from colored LEDs, then color balance is lost, but this creates rainbow effects and colored shadows
Solution Approach 1:
The patent implements feedback control by continuously monitoring the light flux from each LED group and adjusting the drive currents accordingly. When obstacles block light from certain LED groups, the system detects the change and compensates by adjusting the current to other groups, maintaining color balance and preventing rainbow effects. This feedback mechanism ensures stable color temperature despite dynamic blocking conditions.
Solution Approach 2:
The system performs self-correction by automatically adjusting the contributions of different LED groups based on actual light flux conditions. When blocking occurs, the system self-regulates the color balance without external intervention, maintaining reliable color temperature stability through automated compensation mechanisms.
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 adjustable spectral characteristics without altering visual illumination, maintaining consistent light flux and reducing radiant energy and photobiological risks, ensuring stable color perception and safety for medical procedures.
Implementation Method 1
optical filter means suitable for filtering said white light emitted by the LED, the device being characterized in that said optical filter means comprise at least two optical filters that have different transmission coefficients
Implementation Method 2
the lighting device includes a power supply unit suitable for delivering different power supply currents to said LED depending on whether one or the other of the optical filters is positioned to filter said light from the LED
Data Source
AI summary
An LED lighting device (6) having an LED (8) emitting white light and optical filter means (12) suitable for filtering the white light emitted by the LED (8). The optical filter means comprise at least two optical filters (12) that have different transmission coefficients and that are positionable to filter the light emitted by the LED (8) individually. The lighting device (6) includes a power supply unit (10) suitable for delivering different power supply currents to the LED (8) depending on whether one or the other of the optical filters (12) is positioned to filter the light from the LED (8), so as to modify the color temperature of the light emitted by the LED (8).