Light Source Apparatus Circadian Stimulus Control

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Current light source technologies fail to effectively provide different circadian stimulus lights tailored to daytime and nighttime environments, as they do not adequately adjust spectral composition to influence human circadian rhythms without altering perceived color temperature.

Innovation Solution

A light source apparatus comprising a light-emitting module and a control unit that switches between first and second lights with different spectral compositions but similar color temperatures, allowing for adjustment of circadian stimulus values to match environmental and temporal requirements without affecting perceived color temperature.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If light spectral composition is adjusted to provide different circadian stimulus for daytime and nighttime, then circadian rhythm regulation is improved, but color temperature perception becomes inconsistent

Engineering Contradiction:

Improvecircadian stimulus adjustmentVSAvoidcolor temperature perception

Core Design Contradiction:

Adaptability or versatilityVSStability of the object's composition

Solution Approach 1:

The light source is segmented into multiple wavelength components (blue, green, yellow, red channels) that can be independently controlled. This allows selective adjustment of circadian-stimulating wavelengths (480-530nm) while maintaining stable perceived color temperature through compensation by other wavelength components.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent changes the spectral composition parameters (intensity ratios of different wavelength LEDs) to provide different circadian stimulus values for daytime and nighttime modes while keeping the correlated color temperature parameter substantially constant through coordinated adjustment of multiple LED channels.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If high color temperature light is used at nighttime to inhibit melatonin secretion, then circadian stimulus is improved, but health impact increases due to inappropriate light exposure

Engineering Contradiction:

Improvecircadian stimulusVSAvoidhealth impact from inappropriate light exposure

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The light source dynamically adjusts its spectral composition based on time of day and environmental conditions. During nighttime, it provides sufficient circadian stimulus during wakeful hours then transitions to low-circadian-stimulus modes during sleep periods, preventing both excessive melatonin suppression and inappropriate circadian activation.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system incorporates environmental light sensing and time-based control to automatically adjust spectral composition. The control unit receives feedback about ambient conditions and user activity state to modulate light output, ensuring appropriate circadian stimulus delivery while avoiding harmful exposure patterns.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS10039169B2Light source apparatus

Publication Date: 2018.07.31 LRU TECH INC

AI summary

A light source apparatus including a light-emitting module and a control unit is provided. The light-emitting module is configured to provide a light. The control unit makes the light emitted from the light-emitting module switched among a plurality of kinds of first light. Correlated color temperatures of the plurality of kinds of first light are different from each other, and circadian action factors of the plurality of kinds of first light are substantially the same as each other.