Illumination apparatus used for plant cultivation

Patent metadata

Field	Value
Publication number	US-9807945-B2
Application number	US-201414577120-A
Country	US
Kind code	B2
Filing date	Dec 19, 2014
Priority date	Jun 20, 2012
Publication date	Nov 7, 2017
Grant date	Nov 7, 2017

Abstract

The present invention provides an illumination apparatus for plant cultivation, including a unit configured to change light in any wavelength region of 300 nm or higher and 600 nm or lower (wavelengths of 452 nm to 474 nm, for example) to light in the wavelength region having dominantly a right-circularly polarized light component. The illumination apparatus of the present invention enables irradiation with light that is capable of giving a specific effect in plant cultivation.

First claim

The invention claimed is:

1. An illumination apparatus for plant cultivation,
comprising a unit configured to change light in any wavelength region of 300 nm or higher and 600 nm or lower to light in the wavelength region comprising dominantly a right-circularly polarized light component, and
the illumination apparatus emitting substantially non-polarized light in at least a part of wavelengths of 601 nm to 800 nm.

2. The illumination apparatus according to claim 1 , comprising a unit configured to change light of wavelengths of 452 nm to 474 nm to light of wavelengths of 452 nm to 474 nm comprising dominantly a right-circularly polarized light component.

3. The illumination apparatus according to claim 1 , emitting substantially non-polarized light in wavelengths of 620 nm to 640 nm.

4. The illumination apparatus according to claim 1 , wherein the unit substantially does not change a polarization stage of light of wavelengths of 620 nm to 640 nm.

5. The illumination apparatus according to claim 1 , comprising a light source.

6. The illumination apparatus according to claim 5 , wherein the light source comprises a blue light-emitting diode.

7. The illumination apparatus according to claim 1 , wherein the unit comprises a polarizing plate and a retardation plate.

8. The illumination apparatus according to claim 1 ,
comprising a light source that emits light of wavelengths of 452 nm to 474 nm, a light source that emits light of wavelengths of 620 nm to 640 nm and a unit configured to change light in a wavelength region of wavelengths of 452 nm to 474 nm to light having dominantly a right-circularly polarized light component in a wavelength region of wavelengths of 452 nm to 474 nm, and the illumination apparatus emitting substantially non-polarized light in wavelengths of 620 nm to 640 nm.

9. The illumination apparatus according to claim 1 ,
comprising a light source that emits light of wavelengths of 452 nm to 474 nm, a light source that emits light of wavelengths of 620 nm to 640 nm and a unit configured to change light in a wavelength region of wavelengths of 452 nm to 474 nm to light having dominantly a right-circularly polarized light component in a wavelength region of wavelengths of 452 nm to 474 nm and substantially not to change a polarization state of light of wavelengths of 620 nm to 640 nm.

Assignees

• Fujifilm Corp

Inventors

• Usami Yoshihisa
• Ichihashi Mitsuyoshi

Classifications

• Y02P60/146

  Cross-Sectional Technologies · mapped topic

• F21V9/14

  for producing polarised light · CPC title

• A01G7/045 Primary

  with electric lighting · CPC title

• F21Y2101/00

  Point-like light sources · CPC title

• F21K9/64

  using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer · CPC title