Illumination device, illumination system, and illumination control method

Patent metadata

Field	Value
Publication number	US-12022590-B2
Application number	US-202117798650-A
Country	US
Kind code	B2
Filing date	Feb 19, 2021
Priority date	Feb 19, 2020
Publication date	Jun 25, 2024
Grant date	Jun 25, 2024

Abstract

An illumination device includes a light emitter configured to emit illumination light and a controller configured to control the light emitter. The controller controls the illumination light such that a first decrease ratio of melanopic illuminance of illumination light during night-time illumination to melanopic illuminance of illumination light during daytime illumination is higher than a second decrease ratio of illuminance of the illumination light during the night-time illumination to illuminance of the illumination light during the daytime illumination.

First claim

The invention claimed is:

1. An illumination device comprising:
a light emitter configured to emit illumination light; and
a controller configured to control the light emitter,
wherein the controller controls the illumination light such that a first decrease ratio of a melanopic illuminance of illumination light during night-time illumination to a melanopic illuminance of illumination light during daytime illumination is higher than a second decrease ratio of an illuminance of the illumination light during the night-time illumination to an illuminance of the illumination light during the daytime illumination.

2. The illumination device according to claim 1 , wherein the controller controls the illumination light such that the illuminance of the illumination light during the night-time illumination is lower than the illuminance of the illumination light during the daytime illumination.

3. The illumination device according to claim 1 , wherein the controller controls the illumination light such that the first decrease ratio is higher than a third decrease ratio of a color temperature of the illumination light during the night-time illumination to a color temperature of the illumination light during the daytime illumination.

4. The illumination device according to claim 1 , wherein the controller controls the illumination light such that a color temperature of the illumination light during the night-time illumination is lower than a color temperature of the illumination light during the daytime illumination.

5. The illumination device according to claim 1 , wherein the controller controls the illumination light such that the first decrease ratio is higher than a fourth decrease ratio of a photon flux of the illumination light during the night-time illumination to a photon flux of the illumination light during the daytime illumination.

6. The illumination device according to claim 1 , wherein the controller controls the illumination light such that a photon flux of the illumination light during the night-time illumination is lower than a photon flux of the illumination light during the daytime illumination.

7. The illumination device according to claim 1 , wherein the controller determines, based on dim light melatonin onset, timing of decreasing the melanopic illuminance.

8. The illumination device according to claim 1 , wherein the controller controls the illumination light such that melanopic power has a given value or less at dim light melatonin onset.

9. The illumination device according to claim 1 , wherein the controller controls the illumination light such that melanopic power starts to decrease at a given time before dim light melatonin onset.

10. The illumination device according to claim 1 , wherein the controller controls the illumination light by determining, as the dim light melatonin onset, a time at which melatonin secretion exceeds a given value.

11. The illumination device according to claim 1 , wherein the controller controls the illumination light by determining, as the dim light melatonin onset, a time at which melatonin secretion in a subject exceeds two times a standard deviation of the melatonin secretion calculated from data, the data being acquired from at least three measurement times of the melatonin secretion until a given time before bedtime of the subject.

12. The illumination device according to claim 1 , wherein the controller determines melanopic power as a given value or less while determining a decrease ratio of the illuminance of the illumination light being lower than a decrease ratio of the melanopic illuminance of the illumination light.

13. The illumination device according to claim 1 , wherein the controller determines melanopic power as 0% at bedtime of a subject.

14. An illumination system comprising a server and an illumination device configured to emit illumination light,
wherein the server controls the illumination light such that a first decrease ratio of a melanopic illuminance of illumination light during night-time illumination to a melanopic illuminance of illumination light during daytime illumination is higher than a second decrease ratio of an illuminance of the illumination light during the night-time illumination to an illuminance of the illumination light during the daytime illumination.

15. An illumination control method, comprising:
controlling, by an illumination device comprising a light emitter configured to emit illumination light, the illumination light emitted by the light emitter such that a first decrease ratio of a melanopic illuminance of illumination light during night-time illumination to a melanopic illuminance of illumination light during daytime illumination is higher than a second decrease ratio of an illuminance of the illumination light during the night-time illumination to an illuminance of the illumination light during the daytime illumination.

Assignees

• Kyocera Corp
• Public Univ Corporation Nara Medical Univ

Inventors

• Mitsui Katsuhiro
• Katou Hidetaka
• Obayashi Kenji

Classifications

• A61N2005/0626

  Monitoring, verifying, controlling systems and methods · CPC title

• A61N5/0618

  Psychological treatment · CPC title

• Y02B20/40

  Control techniques providing energy savings, e.g. smart controller or presence detection · CPC title

• H05B47/105

  in response to determined parameters · CPC title

• H05B47/16 Primary

  by timing means · CPC title