Optical member, optical member producing method, and image display device

Patent metadata

Field	Value
Publication number	US-10353247-B2
Application number	US-201615044578-A
Country	US
Kind code	B2
Filing date	Feb 16, 2016
Priority date	Feb 20, 2015
Publication date	Jul 16, 2019
Grant date	Jul 16, 2019

Abstract

An optical member having a base and an underlayer with a region A of surface energy AE and a region B of surface energy BE (BE-AE>0 mN/m), in which a dot of a wavelength-selective reflective cholesteric structure is disposed on the region B, has high pattern position accuracy for the patterns formed with the dots.

First claim

What is claimed is:

1. An optical member comprising a substrate wherein:
the substrate comprises a base and an underlayer provided on the base,
the underlayer has a surface with a region A of surface energy AE and a region B of surface energy BE,
a dot of a wavelength-selective reflective cholesteric structure is disposed on the region B, and
the surface energy AE and the surface energy BE satisfies the relation:
BE - AE> 0 mN/m;

wherein the region B has a structure that includes a shape having a form of a hemisphere, a ball cap, or with a curvature that is convex up relative to the surface, and
wherein the diameter of the dot is greater than the diameter of the region B.

2. The optical member according to claim 1 , wherein the surface energy AE and the surface energy BE satisfy 5 mN/m<BE-AE<18 mN/m.

3. The optical member according to claim 1 , wherein the dot has a surface energy CE, and the surface energy AE and the surface energy CE satisfy −6 mN/m<CE-AE<12 mN/m.

4. The optical member according to claim 1 , wherein the region A and the region B of the underlayer are fabricated by being printed.

5. The optical member according to claim 1 , wherein the region A and the region B of the underlayer represent a layer with a surface energy that varies under applied energy.

6. The optical member according to claim 1 , wherein the region A includes a surfactant containing a fluorine atom.

7. The optical member according to claim 1 , wherein the region B includes a material with a liquid crystal aligning capability.

8. The optical member according to claim 7 , wherein the material with a liquid crystal aligning capability contains a compound comprised of a liquid crystal material.

9. The optical member according to claim 8 , wherein the liquid crystal material is horizontally aligned.

10. The optical member according to claim 7 , wherein the material with a liquid crystal aligning capability is a material for optical alignment films.

11. The optical member according to claim 7 , wherein the material with a liquid crystal aligning capability contains a compound having a hydroxyl group.

12. The optical member according to claim 7 , wherein the material with a liquid crystal aligning capability contains a polyvinyl alcohol compound, or a poly(meth)acryl compound having a polar group.

13. The optical member according to claim 1 ,
wherein the cholesteric structure provides a stripe pattern of bright zone and dark zone in a cross sectional view of the dot under a scanning electron microscope,
wherein the dot includes a portion in which a dot height continuously increases to maximum height from a dot end toward the dot center, and
wherein the dot in said portion makes an angle of 70° to 90° between the dot surface opposite the substrate and a normal line of a line represented by a first dark zone from the dot surface opposite the substrate.

14. The optical member according to claim 13 , wherein the quotient of the maximum height divided by a diameter of the dot is 0.13 to 0.30.

15. The optical member according to claim 13 , wherein the dot at the dot end makes an angle of 27° to 62° between the substrate and the dot surface opposite the substrate.

16. The optical member according to claim 1 ,
wherein the cholesteric structure contains a liquid crystal material having a cholesteric liquid crystal structure, and the liquid crystal material contains a surfactant.

17. The optical member according to claim 1 , wherein the dot is formed on a surface of the substrate as a pattern of a plurality of dots.

18. The optical member according to claim 1 , wherein the dot has a diameter of 20 to 200 μm.

19. The optical member according to claim 1 , wherein the dot shows wavelength selective reflectivity with a maximum reflection wavelength in the infrared region.

20. The optical member according to claim 1 , wherein the optical member is transparent in the visible light region.

21. A method for producing an optical member comprising:
providing an underlayer region A and an underlayer region B on a base to form a substrate having an underlayer with a surface separated into the region A and the region B; and
disposing a wavelength-selective reflective dot having a cholesteric structure on the region B,
wherein the optical member satisfies BE-AE>0 mN/m in which AE is the surface energy of the region A, and BE is the surface energy of the region B, and
wherein the region B has a structure that includes a shape having a form of a hemisphere, a ball cap, or with a curvature that is convex up relative to the surface, and
wherein the diameter of the dot is greater than the diameter of the region B.

22. An optical member produced by the method of claim 21 .

23. An image display device comprising the optical member of claim 1 .

24. The optical member according to claim 1 , wherein the main components of regions A and B are different.

Assignees

• Fujifilm Corp

Inventors

• Ichihara Nobuhiko
• Ito Yoji
• Nagai Michio
• Kashiwagi Daisuke
• Yamamoto Akira

Classifications

• G06F3/03545

  Pens or stylus · CPC title

• G06F3/0321

  by optically sensing the absolute position with respect to a regularly patterned surface forming a passive digitiser, e.g. pen optically detecting position indicative tags printed on a paper sheet (constructional details of pen-shaped pointing devices G06F3/03545, G06F3/03542, G06F3/037) · CPC title

• G02F1/13338

  Input devices, e.g. touch panels · CPC title

• G02B27/1006

  for splitting or combining different wavelengths (G02B27/1086, G02B27/141 take precedence) · CPC title

• G02B5/26 Primary

  Reflecting filters (G02B5/28 takes precedence) · CPC title