TRANSMISSION SCREEN FOR INTERACTIVE BOARD

• US 20110122493A1
• Filed: 03/25/2010
• Published: 05/26/2011
• Est. Priority Date: 03/26/2009
• Status: Active Grant

• Current Assignee: Dai Nippon Printing Company Limited
• Original Assignee: Dai Nippon Printing Company Limited
• Inventors: Ogawa, Takeshi, Ogawa, Kazunobu, Ohki, Kenji, Sadahiro, Tetsuya
• Granted Patent: US 8,634,136 B2
• Time in Patent Office: Days
• US Class Current: 359/457
• CPC Class Codes: G02B 1/14 Protective coatings, e.g. hard coatings
• CPC Class Codes: G02B 5/0231 the surface having microprismatic or micropyramidal shape macroscopic prism arrays G02B5/045
• CPC Class Codes: G02B 5/0278 used in transmission
• CPC Class Codes: G03B 21/62 Translucent screens

Abstract

There is provided a screen that, as a screen suitable for an interactive board, can output video image light incident obliquely from the back surface side to a viewer side to display a reflection-free image and, at the same time, can realize easy handwriting on the screen surface on the viewer side. To this end, a transmission screen for an interactive board is provided that comprises at least a Fresnel lens sheet comprising a prism part on its incident light side, a light diffusing member provided on the Fresnel lens on its surface side remote from the prism part, and a hard coat layer provided on the outgoing light side of the light diffusing member.

Claims

1. A transmission screen for an interactive board, the transmission screen comprising at least:

a Fresnel lens sheet having a prism part on its incident light side;

a light diffusing member provided on the Fresnel lens on its surface side remote from the prism part; and

a hard coat layer provided on the outgoing light side of the light diffusing member.

2. The transmission screen for an interactive board according to claim 1, wherein the Fresnel lens sheet comprises a refractive Fresnel lens, a total reflection Fresnel lens, or a combination of the refractive Fresnel lens with the total reflection Fresnel lens.

3. The transmission screen for an interactive board according to claim 1, wherein the Fresnel lens sheet comprises a circular Fresnel lens or a linear Fresnel lens.

4. The transmission screen for an interactive board according to claim 1, wherein the Fresnel lens sheet is laminated directly onto the light diffusing member through an adhesive layer.

5. The transmission screen for an interactive board according to claim 1, wherein the Fresnel lens is provided directly on one surface of the light diffusing member.

9. The transmission screen for an interactive board according to claim 1, wherein the light diffusing member is laminated onto the hard coat layer through an adhesive layer.

10. The transmission screen for an interactive board according to claim 1, wherein the hard coat layer is provided directly on one surface of the light diffusing member.

11. The transmission screen for an interactive board according to claim 1, wherein an antireflection layer or positional information detection means is provided on the outgoing light side of the hard coat layer.

13. An interactive board comprising a transmission screen according to claim 1.

14. An interactive board system comprising an interactive board according to claim 13.

6. A transmission screen for an interactive board, the transmission screen having a lens part provided on both surfaces of a transparent base material, the transmission screen comprising:

a total reflection linear Fresnel lens part comprising prisms that are arranged on an incident light side as one surface of the transparent base material, have a total reflection function, and are arranged next to each other in a vertical direction;

a linear prism lens part comprising prisms that are arranged on the transparent base material on its surface side remote from the total reflection linear Fresnel lens part and are arranged next to each other in a direction perpendicular to the direction in which the total reflection linear Fresnel lens part is disposed;

a light diffusing member provided on the outgoing light side of the linear prism lens part; and

a hard coat layer provided on the outgoing light side of the light diffusing member.

7. The transmission screen for an interactive board according to claim 6, wherein the linear prism lens part is integrated with the light diffusing member.

8. The transmission screen for an interactive board according to claim 7, wherein at least a part of the front end of the linear prism lens part is flattened in a direction parallel to the transparent base material and is integrated with the light diffusing member.

12. A method for manufacturing a transmission screen for an interactive board according to claim 6, the method comprising the steps of:

a) providing a mold for molding the total reflection linear Fresnel lens part comprising prisms that have a total reflection function and are arranged next to each other in a vertical direction;

b) providing a mold for molding the linear prism lens part; and

c) continuously supplying a transparent base material into the two molds, supplying an ionizing radiation curable resin into between the transparent base material and the two molds, irradiating the ionizing radiation curable resin with an ionizing radiation to cure the ionizing radiation curable resin, and separating a molded product from the two molds.