Pattern printed sheet

• US 9,213,929 B2
• Filed: 05/25/2007
• Issued: 12/15/2015
• Est. Priority Date: 05/30/2006
• Status: Expired due to Fees

• Current Assignee: Dai Nippon Printing Company Limited
• Original Assignee: Dai Nippon Printing Company Limited
• Inventors: Tazaki, Keiko, Miyazaki, Yuichi, Maenishi, Satoko, Nakamura, Runa, Yoshihara, Toshio, Yamashita, Yuudai
• Primary Examiner(s): Merlin, Jessica M
• Application Number:
  US11/753,654
• Publication Number:
  US 20070290047A1
• Time in Patent Office: 3,126 Days
• US Class Current: 1/1
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 2201/343 cholesteric liquid crystal reflector
• CPC Class Codes: G06K 19/06037 multi-dimensional coding

Abstract

The pattern printed sheet 1 of the present invention includes a substrate 2 and a non-visible light-reflective transparent pattern 3 printed on a surface of the substrate, wherein an ink for forming the transparent pattern 3 contains a non-visible light-reflective material capable of selectively reflecting a light having a wavelength in a non-visible light range, and the transparent pattern 3 printed on the surface of the substrate 2 has a multilayer structure in section which is repeated at predetermined intervals as observed by a scanning electron microscope, and reflects only a circular polarization component in a predetermined rotation direction relative to an incident light applied thereto. The pattern printed sheet is usable as a coordinate detecting means which is applicable a data input system of a type capable of directly hand-writing input data on an image screen of a display device, and has a reduced weight and a low price, and is readily obtained in the form of a large area sheet and can be mass-produced.

Claims

1. A pattern printed sheet comprising a substrate and a non-visible light-reflective transparent pattern printed on a surface of the substrate, wherein an ink for forming the transparent pattern contains a non-visible light-reflective material capable of selectively reflecting a light having a wavelength in a non-visible light range, a non-visible light reflectance of the transparent pattern as measured at a peak selective reflection wavelength being 13 to 50%, and the transparent pattern has a dot pattern, and has a multilayer structure in section which is repeated at predetermined intervals and, when observing a section of the structure, a repeated layer structure appears every 180°

when the liquid crystal molecule is rotated, as observed by a scanning electron microscope, and reflects only a circular polarization component in a predetermined rotation direction relative to an incident light applied thereto,

wherein the multilayer structure is formed from a liquid crystal material having a fixed cholesteric structure, wherein the liquid crystal material having a fixed cholesteric structure is made of a chiral nematic liquid crystal material formed by mixing a nematic liquid crystal with a chiral agent, wherein the nematic liquid crystal is in the form of a compound having an acrylate structure, the non-visible light reflectance being attained by the liquid crystal material having the fixed cholesteric structure,

wherein the transparent pattern printed has a thickness of from 1 to 20 μ

m, and

wherein the nematic liquid crystal includes a compound represented by a formula selected from the group consisting of the following formulae (1), (2), (4)-(9), and (11);

2. The pattern printed sheet according to claim 1, wherein the nematic liquid crystal and the chiral agent contain respective crosslinkable functional groups which are crosslinked with each other to form the fixed cholesteric structure.

3. The pattern printed sheet according to claim 1, wherein an orientation film is disposed between the substrate and the transparent pattern.

4. The pattern printed sheet according to claim 1, wherein the transparent pattern has a peak selective reflection wavelength in the range of from 800 to 950 nm.

5. The pattern printed sheet according to claim 1, wherein the transparent pattern has a peak selective reflection wavelength in the range of from 200 to 400 nm.

6. The pattern printed sheet according to claim 1, wherein the pattern printed sheet provides an information concerning a position of an input terminal capable of irradiating and detecting a non-visible light, on the pattern printed sheet, by reading a pattern reflected from the pattern printed sheet using the input terminal.

7. The pattern printed sheet according to claim 6, wherein the pattern printed sheet is fitted to a display device capable of displaying an image.

8. The pattern printed sheet according to claim 7, wherein the pattern printed sheet is disposed in an opposed relation to a front face of the display device.

9. The pattern printed sheet according to claim 6, wherein the pattern printed sheet is equipped with a fitting means for fitting the pattern printed sheet to the display device.

10. The pattern printed sheet according to claim 9, wherein the fitting means is provided on a contact surface of the pattern printed sheet where the sheet contacts the display device, and is constituted of an attaching member having a bonding property or an adhesion property for attaching the sheet to the display device.

11. The pattern printed sheet according to claim 1, wherein the pattern printed sheet is separable or dividable into a desired size.

12. The pattern printed sheet according to claim 1, wherein the dot pattern includes a patterned combination of dots having a plurality of shapes different from each other.

13. The pattern printed sheet according to claim 1, wherein the dot pattern has an arrangement of dots which are in an offset relation to reference points set in an equidistant relationship to each other in vertical and horizontal directions.

14. The pattern printed sheet according to claim 1, wherein the dot pattern is included in the multilayer structure.

15. The pattern printed sheet according to claim 1, wherein said non-visible light reflectance as measured at said peak selective reflection wavelength is 20 to 50%.

16. The pattern printed sheet according to claim 1, wherein each multilayer structure consists of said dot pattern and a rectangular pattern for measuring a reflectance.

17. The pattern printed sheet according to claim 1, wherein the chiral agent is in the form of a compound having an acrylate structure.

18. The pattern printed sheet according to claim 1, wherein the nematic liquid crystal includes a compound represented by formula (11).

19. The pattern printed sheet according to claim 1, wherein the chiral agent includes a compound represented by the following formula (12):