Hologram recording composition, hologram recording medium, diffraction optical element, and optical device, optical component, and image display device using diffraction optical element

Patent metadata

Field	Value
Publication number	US-12094507-B2
Application number	US-201917312860-A
Country	US
Kind code	B2
Filing date	Oct 21, 2019
Priority date	Dec 11, 2018
Publication date	Sep 17, 2024
Grant date	Sep 17, 2024

Abstract

To provide a hologram recording composition that can further improve diffraction characteristics and transparency of a hologram.The present technology provides a hologram recording composition containing a heteropoly acid, a photopolymerizable monomer, a photopolymerization initiator, and a sensitizing dye having absorption in a visible light region in the presence of an acid. The present technology also provides a hologram recording medium including at least a photocurable resin layer containing a heteropoly acid, a photopolymerizable monomer, a photopolymerization initiator, and a sensitizing dye having absorption in a visible light region in the presence of an acid. Furthermore, the present technology also provides a diffraction optical element using the hologram recording medium. Moreover, the present technology also provides an optical device, an optical component, and an image display device using the diffraction optical element.

First claim

The invention claimed is:

1. A hologram recording composition comprising at least a heteropoly acid, a photopolymerizable monomer, a photopolymerization initiator, and a sensitizing dye having absorption in a visible light region in a presence of an acid,
wherein the heteropoly acid is phosphotungstic acid dodecahydrate, wherein the photopolymerizable monomer is tricyclodecanedimethanol diacrylate, wherein the photopolymerization initiator is 4-isopropyl-4′-methyldiphenyliodonium tetrakis(pentafluorophenyl) borate, wherein the sensitizing dye is 2,5-dibenzylidene cyclopentanone, and
wherein the hologram recording composition in a diffraction optical element is capable of providing a refractive index modulation degree of 0.05 or more in the diffraction optical element.

2. The hologram recording composition according to claim 1 , wherein the heteropoly acid has a refractive index of 1.8 or more.

3. A hologram recording medium comprising a photocurable resin layer containing at least a heteropoly acid, a photopolymerizable monomer, a photopolymerization initiator, and a sensitizing dye having absorption in a visible light region in a presence of an acid,
wherein the heteropoly acid is phosphotungstic acid dodecahydrate, wherein the photopolymerizable monomer is tricyclodecanedimethanol diacrylate, wherein the photopolymerization initiator is 4-isopropyl-4′-methyldiphenyliodonium tetrakis(pentafluorophenyl) borate, wherein the sensitizing dye is 2,5-dibenzylidene cyclopentanone, and
wherein the hologram recording medium in a diffraction optical element is capable of providing a refractive index modulation degree of 0.05 or more in the diffraction optical element.

4. The hologram recording medium according to claim 3 , wherein the heteropoly acid has a refractive index of 1.8 or more.

5. The hologram recording medium according to claim 3 , wherein
the hologram recording medium includes at least one transparent base material, and
the photocurable resin layer is formed on the at least one transparent base material.

6. The hologram recording medium according to claim 3 , wherein the hologram recording medium includes a volume phase type hologram.

7. A diffraction optical element comprising the hologram recording medium according to claim 3 , wherein the hologram recording medium has been exposed to a semiconductor laser in a visible light region and then irradiated with ultraviolet rays, and wherein the diffraction optical element has a refractive index modulation degree of 0.05 or more.

8. The diffraction optical element according to claim 7 , having a visible light transmittance of 80% or more and a haze of 0.5% or less.

9. An optical device comprising the diffraction optical element according to claim 7 .

10. An optical component comprising the diffraction optical element according to claim 7 .

11. An image display device comprising the diffraction optical element according to claim 7 .

Assignees

• Sony Group Corp

Inventors

• Igarashi Eri
• Ohe Takahiro
• Hara Hisaya
• KAWASAKI Kenshiro
• Hobara Daisuke

Classifications

• G11B7/246

  containing dyes · CPC title

• G11B7/245

  containing a polymeric component · CPC title

• G11B7/24044

  for storing optical interference patterns, e.g. holograms; for storing data in three dimensions [3D], e.g. volume storage (G11B7/24038 takes precedence) · CPC title

• G03H2260/12

  Photopolymer · CPC title

• G03H2001/0264

  Organic recording material · CPC title