Pattern printed transparent sheet

• US 20080182041A1
• Filed: 01/22/2008
• Published: 07/31/2008
• Est. Priority Date: 01/23/2007
• Status: Active Grant

• Current Assignee: Dai Nippon Printing Company Limited
• Original Assignee: Dai Nippon Printing Company Limited
• Inventors: Sekine, Keiko, Miyazaki, Yuichi
• Granted Patent: US 8,367,189 B2
• Time in Patent Office: Days
• US Class Current: 428/29
• CPC Class Codes: G02B 5/3016 involving passive liquid crystal elements optical properties of liquid crystals G02F1/0063; polarising elements associated with active liquid crystal devices G02F1/133528
• CPC Class Codes: G06F 3/0421 by interrupting or reflecting a light beam, e.g. optical touch-screen
• CPC Class Codes: G06K 19/06037 multi-dimensional coding
• CPC Class Codes: Y10T 428/24934 including paper layer

Abstract

A non-visible light reflective pattern-printed transparent sheet having a broad read angle is provided. The above transparent sheet is a pattern-printed transparent sheet in which a transparent substrate comprises a base material and a primer layer, and a non-visible light reflective transparent pattern is printed on the surface of the primer layer; an ink constituting the transparent pattern described above contains a material having a wavelength selective reflectivity to a wavelength in an infrared or ultraviolet region; the primer layer described above comprises a primer composition repelling the ink described above; when a cross section obtained by cutting the transparent pattern described above in a face orthogonal to the above transparent substrate is observed under a scanning electron microscope, the transparent pattern described above comprises a multilayer structure comprising a fixed repeating cycle and having a curved part and reflect selectively one of a left circularly polarized light component and a right circularly polarized light component in an incident light.

Claims

1. A pattern-printed transparent sheet in which a transparent substrate comprises a base material and a primer layer, and a non-visible light reflective transparent pattern is printed on the surface of the primer layer;

an ink constituting the transparent pattern contains a material having a wavelength selective reflectivity to a wavelength in an infrared or ultraviolet region;

the primer layer consists of a primer composition repelling the ink; and

when a cross section obtained by cutting the transparent pattern in a face orthogonal to the above transparent substrate is observed under a scanning electron microscope, the transparent pattern comprises a multilayer structure comprising a fixed repeating cycle and having a curved part and reflect selectively either of a left circularly polarized light component and a right circularly polarized light component in an incident light.

2. The pattern-printed transparent sheet as described in claim 1, wherein the transparent pattern has a dot shape.

3. The pattern-printed transparent sheet as described in claim 1, wherein the material having a wavelength selective reflectivity is a cholesteric liquid crystal material, and the multilayer structure of the transparent pattern comprises a fixed cholesteric structure.

4. The pattern-printed transparent sheet as described in claim 3, wherein the cholesteric liquid crystal material comprises a chiral nematic liquid crystal material prepared by mixing a nematic liquid crystal with a chiral agent.

5. The pattern-printed transparent sheet as described in claim 4, wherein the nematic liquid crystal and the chiral agent have respectively cross-linkable functional groups, and the cholesteric structure is fixed by cross-linking them.

6. The pattern-printed transparent sheet as described in claim 4, wherein the nematic liquid crystal and/or the chiral agent are compounds having an acrylate structure.

7. The pattern-printed transparent sheet as described in claim 1, wherein the primer composition contains a liquid repelling leveling agent.

8. The pattern-printed transparent sheet as described in claim 1, wherein the primer composition contains a reactive monomer and/or reactive oligomer.

9. The pattern-printed transparent sheet as described in claim 1, wherein the transparent pattern has a selective reflection peak wavelength in 800 to 950 nm.

10. The pattern-printed transparent sheet as described in claim 1, wherein the transparent pattern has a selective reflection peak wavelength in 200 to 400 nm.

11. The pattern-printed transparent sheet as described in claim 1, wherein the transparent pattern is a pattern in which reflected pattern of a non-visible light is read by an input terminal capable of irradiation and detection of a non-visible light and in which a position information of the input terminal on the transparent sheet can be provided.

12. The pattern-printed transparent sheet as described in claim 1, wherein the transparent sheet is a transparent sheet installed oppositely to a front face of a display device capable of displaying images.

13. The pattern-printed transparent sheet as described in claim 12, which is equipped with an installing means for installation thereof onto the display device.

14. The pattern-printed transparent sheet as described in claim 13, wherein the installing means is an adhering instrument which is provided at a contact face side brought into contact with the display device and which has an adhesive property or a sticky property for adhering the instrument onto the display device.

15. The pattern-printed transparent sheet as described in claim 1, which is separable.