Pulsed Blue and Red Light System for Circadian Modulation
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Solution Overview
Problem
Existing artificial light systems for influencing circadian rhythms and psychological conditions using pulsed blue light face limitations such as stroboscopic effects and toxicity, inefficiency due to broad wavelength ranges, and rapid degradation of melanopsin photoreceptors, leading to reduced efficacy and potential harm.
Innovation Solution
An artificial light system with a controller managing pulsed blue light and red light sources, avoiding stroboscopic effects by synchronizing or desynchronizing their cycles, and using specific wavelength peaks (blue around 470 nm and red around 625 nm) to minimize toxicity and enhance biological impact, while allowing for continuous or pulsed emission to optimize circadian rhythm modulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pulsed blue light is used to modulate circadian rhythms, then efficacy in influencing biological clock is improved, but stroboscopic effect causes discomfort and reduces safety
Solution Approach 1:
The patent applies periodic action by using pulsed blue light at specific frequencies (e.g., 10-100 Hz) to stimulate melanopsin photoreceptors rhythmically, which effectively modulates circadian rhythms while the pulse frequency is carefully selected to avoid perceptible stroboscopic effects that cause discomfort
2Reliability
If blue light wavelength below 540 nm is used, then biological impact on SCN is enhanced, but blue light hazard and toxicity increase
Solution Approach 1:
The patent applies parameter changes by precisely controlling the blue light wavelength to peak around 470 nm (within 450-490 nm range) and using pulsed delivery at specific frequencies, which optimizes melanopsin activation while reducing retinal toxicity compared to continuous broad-spectrum blue light exposure
3Duration of action of stationary object
If continuous blue light is emitted, then circadian rhythm modulation is maintained, but melanopsin photoreceptors degrade rapidly reducing efficacy
Solution Approach 1:
The patent applies periodic action by emitting blue light in pulses rather than continuously, with duty cycles that allow melanopsin photoreceptors to recover between pulses, thereby maintaining sustained circadian rhythm modulation effectiveness without rapid photoreceptor degradation
Solution Approach 2:
The patent achieves continuity of useful action through high-frequency pulsing (10-100 Hz) that maintains effective melanopsin stimulation over extended periods by preventing photoreceptor fatigue, ensuring continuous circadian rhythm modulation without loss of efficacy
4Illumination intensity
If broad wavelength range light is used, then general illumination is improved, but efficiency in targeting melanopsin is reduced
Solution Approach 1:
The patent applies local quality by concentrating light energy in a specific wavelength band (450-490 nm peaking at 470 nm) that matches melanopsin absorption characteristics, rather than using broad spectrum light, thereby maximizing biological effectiveness per unit energy while providing sufficient illumination
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 system effectively modulates circadian rhythms and psychological conditions by reducing melatonin secretion, increasing body temperature, and enhancing vigilance without causing discomfort or blue light hazard, demonstrating improved efficacy and safety compared to previous methods.
Implementation Method 1
a first light-emitting source for emitting a first light having a wavelength spectrum below 540 nm
Implementation Method 2
a second light-emitting source for emitting a second light having a wavelength spectrum of at least 540 nm
Implementation Method 3
the controller is programmed to control the first light-emitting source to provide pulses of the first light, wherein the pulses of the first light have a frequency adapted to avoid a stroboscopic effect
Implementation Method 4
the response of SCN to light conditions is attributable to the presence of light-sensitive receptors in the retina, which signal the SCN accordingly
Data Source
AI summary
The present invention relates to an artificial light system for modulating circadian rhythms, increasing vigilance and influencing light-associated psychological conditions such as seasonal affective disorder. The system of the invention comprises a source of a green and/or red light and a source of blue light both light sources being controlled by a computer to provide predetermined light conditions. More specifically, the computer is programmed to provide pulses of blue light and continuous or pulsed red light, to enhance the efficacy of blue light, reduce blue-light hazard and avoid stroboscopic effect.