JP2007309985A - Image sheet used for both transmitted light and reflected light - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image sheet used for both transmitted light and reflected light, which is used over a longer period than heretofore by suppressing image deterioration as much as possible. <P>SOLUTION: The image sheet comprises: a base layer 11 composed of a translucent sheet object; a first image layer 12 composed of a first image formed on one surface of the base layer 11; a second image layer 13 composed of a second image formed on the other surface of the base layer 11; a middle layer 14 composed of a transparent or translucent sheet object provided on the first image layer 12; and a third image layer 15 provided on the middle layer 14. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an image sheet for both transmitted light and reflected light, which can display a clear image by either transmitted light or reflected light.

  2. Description of the Related Art Conventionally, image panels of various sizes for advertisements are often attached to a station premises, a room wall of a hotel or department store, or an outer wall of a building. Usually, such an image panel is provided with an image sheet for both transmitted and reflected light on which an image is formed, on an appropriate panel frame, and is illuminated from the back of the image sheet by a fluorescent lamp, EL (electric luminescence light), or the like. The observer can clearly see the image by the transmitted light by the back illumination. Further, when back lighting is not performed, an image can be seen to some extent vividly by reflected light from the illumination if the illumination intensity in the environment such as premises lighting or sunlight is appropriate.

  Conventionally, as such an image sheet for both transmitted and reflected light, a photographic film in which a photosensitive emulsion is coated on both sides of a support made of a translucent film is used, and images are mutually attached to the photosensitive emulsion layers on both sides. A positive photograph obtained by baking and developing it is used as an image sheet (Patent Document 1).

Further, a transparent resin film layer made of polyester, a first image layer formed on one surface of the resin film layer, a milky layer formed on the surface of the first image layer, and a surface of the milky layer An image sheet having a formed second image layer has also been proposed (Patent Document 2).
JP 59-222835 JP-A-2005-132090

  However, the conventional image sheet has a problem in terms of weather resistance. That is, since the image sheet is exposed to illumination light such as a fluorescent lamp or sunlight, there is a problem that the image deteriorates due to light rays due to long-term use. In particular, when an image sheet is installed outdoors, sunlight may irradiate directly, so that the image is fading early and becomes a whitish image with a light color and no contrast at an early stage.

  Such an image sheet is expected to have a life of, for example, about 3 years. However, there is a case where the image deteriorates earlier and needs to be replaced.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide an image sheet for both transmitted and reflected light that can be used over a longer period of time while suppressing image degradation as much as possible.

  An image sheet according to the present invention includes a base layer composed of a translucent sheet-like body, a first image layer composed of a first image formed on one surface of the base layer, and the other of the base layer. A second image layer comprising a second image formed on the surface; an intermediate layer comprising a transparent or translucent sheet-like material provided on the first image layer; and on the intermediate layer And a third image layer provided.

  Preferably, the base layer is made of a milky white flexible sheet using a synthetic resin material, and the first image layer and the second image layer are formed on the surface of the base layer by an inkjet printer. It is printed and formed.

  The intermediate layer has a function of absorbing ultraviolet rays.

  The intermediate layer is adhered to the surface of the first image layer, and the reflection degree of light on the surface is larger than that of the base layer.

  The third image layer is formed by printing on the surface of the intermediate layer with an ink jet printer, and the density of the image is lower than that of the first image.

  According to the present invention, it is possible to provide an image sheet for both transmitted light and reflected light that can be used for a longer period of time than the prior art while suppressing image deterioration as much as possible.

  FIG. 1 is a sectional view showing a part of an image sheet 1 according to the present invention.

  In FIG. 1, the image sheet 1 includes a base layer 11, a first image layer 12, a second image layer 13, an intermediate layer 14, a third image layer 15, and a protective layer 16.

  The base layer 11 is made of a translucent, milky white flexible sheet using a synthetic resin material. As the material of the base layer 11, PET (polyethylene terephthalate), acrylic resin, vinyl chloride, other synthetic resins, and the like are used. Further, as the material of the base layer 11, a glass cloth having light transmittance and light diffusibility, which is plain-woven using a glass yarn obtained by bundling a plurality of single fibers made of glass as warp and weft, may be used. Further, when the size of the image sheet 1 is large, it is necessary to withstand its weight and wind pressure. Therefore, a synthetic resin sheet reinforced with fibers may be used as the base layer 11 in order to ensure strength. For example, you may use what coated the vinyl chloride resin etc. on both surfaces of the sheet-like body knitted with the thread | yarn of polyester.

  The base layer 11 is translucent, but this is because illumination light from the second image layer 13 side is transmitted with practical efficiency, and an observer can view an image from the front side (side in the direction of the arrow M1). It is only necessary to have such a light transmittance that can be observed with sufficient brightness. In addition, the illumination light is appropriately diffused inside the base layer 11 so that the light source of the illumination light is not seen through, and has a light diffusibility such that the surface of the base layer 11 has uniform brightness. It is preferable. When the glass cloth made of the glass yarn described above is used as the base layer 11, the glass cloth is translucent like frosted glass, is milky white, and the other side cannot be seen through. The base layer 11 itself functions as a milky white layer and a light diffusion layer.

  The thickness of the base layer 11 is about several tens of microns to several hundreds of microns, for example, about 100 microns. However, when the size of the image sheet 1 is large, for example, when the length of one side is about 1 meter to several meters, the base layer 11 is made thicker, for example, about several hundred microns to 1 millimeter, or It may be thicker than that.

  The first image layer 12 is formed on one surface of the base layer 11. For example, it is formed by printing on the surface of the base layer 11 with an ink jet printer. In order to suppress image deterioration, it is preferable to use a pigment ink as the ink. When the first image layer 12 is printed by an ink jet printer, appropriate various known processes are applied to the surface of the base layer 11 as necessary so that the ink becomes familiar. The contents of the image of the first image layer 12 can be formed with various contents according to the purpose of use of the image sheet 1 using color, monochrome, photographs, illustrations, line drawings, characters and the like. .

  In forming the first image layer 12, it is possible to employ various methods such as printing with an ink jet printer and image formation with toner using an electrophotographic process.

  The second image layer 13 is formed on the other surface (back surface) of the base layer 11. Similarly to the first image layer 12, the second image layer 13 can be formed by printing with an ink jet printer or other methods. The content of the second image layer 13 is the same as the content of the first image layer 12 and overlaps the same position, and the observer can observe these images as one image.

  The intermediate layer 14 is a transparent or translucent sheet-like body provided on the first image layer 12. As the material of the intermediate layer 14, the same material as that of the base layer 11 can be used, or a different material may be used. The intermediate layer 14 is thinner than the base layer 11. For example, a material of about several tens of microns to several hundreds of microns, for example, about 60 to 80 microns is used.

  The intermediate layer 14 has a function of absorbing ultraviolet rays, that is, a function as a so-called UV cut film. The mid layer 14 is preferably slightly milky. Further, it is preferable that the surface of the intermediate layer 14 (the side of the arrow M1) has a greater degree of light reflection than the base layer 11. The intermediate layer 14 is attached to the surface of the first image layer 12 with an adhesive, a pressure-sensitive adhesive, a pressure-sensitive adhesive tape, or the like.

  The third image layer 15 is provided on the intermediate layer 14. Similarly to the first image layer 12, the third image layer 15 can be formed by printing with an inkjet printer or other methods. The third image layer 15 is formed with a density slightly lower than that of the first image layer 12. The contents of the third image layer 15 are the same as the contents of the first image layer 12 and overlap at the same position. Therefore, the observer can observe the three images of the first image layer 12, the second image layer 13, and the third image layer 15 as one image.

  In forming the image of the third image layer 15, the image may be printed from above the intermediate layer 14 adhered to the surface of the first image layer 12, or the third image may be printed on the surface of the intermediate layer 14. The layer 15 may be printed in advance, and the printed intermediate layer 14 may be attached to the surface of the first image layer 12 while being aligned. Manufacture is easier if the printed intermediate layer 14 is attached to the surface of the first image layer 12.

The protective layer 16 protects the third image layer 15 and the like from contamination. The protective layer 16 can be formed by applying a photocatalyst on the third image layer 15 or attaching a transparent film coated with the photocatalyst. As the photocatalyst, for example, titanium dioxide (TiO ₂ ) can be used. For example, titanium dioxide powder is kneaded and applied to a suitable binder. Alternatively, a thin titanium dioxide film may be formed by a known sol-gel method. Further, it is more preferable that the protective layer 16 has a function as a UV cut film.

  Next, a method of using and an action of the image sheet 1 configured as described above will be described.

  The image sheet 1 is attached to an appropriate frame member or panel, and illuminated from the back by a fluorescent lamp, a neon tube, EL, or the like. The illumination light passes through the image sheet 1 and causes the images formed on the first image layer 12, the second image layer 13, and the third image layer 15 to clearly appear. The observer can clearly see the image by the transmitted light by the illumination light. Further, when back lighting is not performed, the image is clearly seen to a practically sufficient level by the reflected light from the third image layer 15 and the first image layer 12 by ambient ambient light or sunlight. be able to.

  The image sheet 1 is irradiated with ambient light or sunlight. Since the third image layer 15 is further formed on the first image layer 12, the third image layer 15 is formed by the light rays. Even if it deteriorates, the deterioration of the first image layer 12 can be suppressed. In addition, since the intermediate layer 14 is provided on the first image layer 12 and the intermediate layer 14 absorbs ultraviolet rays, the deterioration of the first image layer 12 is further suppressed. As a result, the deterioration of the first image layer 12 and the second image layer 13 is small, the weather resistance of the entire image sheet 1 is improved, and a clear image can be displayed over a longer period than before.

  For example, the weather resistance of an image formed by an ink-jet printer is usually said to be 3 years, but the UV light of the extraneous light is received by the third image layer 15 which is the first layer and is the second layer. The 1st image layer 12 becomes difficult to receive an ultraviolet-ray, and weather resistance improves significantly more than 3 years.

  In printing the first image layer 12, the second image layer 13, and the like, the first image layer 12 is printed using the image data, the base layer 11 is turned upside down, and the position is changed to the original position. Returning to the (initial position), the second image layer 13 may be printed by feeding the base layer 11 again and inverting the same image data. Further, the first image layer 12 and the second image layer 13 may be simultaneously printed on both surfaces of the base layer 11. Further, a protective layer may be formed on the surfaces of the first image layer 12 and the second image layer 13 by appropriate resin coating or the like.

  In the embodiment described above, the content of the image of the third image layer 15 is exactly the same as that of the first image layer 12, but the content of the image of the third image layer 15 is changed to the first image layer 12. It is good also as the content which abbreviate | omitted a part of image.

  In addition, the structure, shape, dimensions, number, material, composition, image content, etc. of the whole or each part of the base layer 11, the intermediate layer 14, the third image layer 15, the protective layer 16, or the image sheet 1 are described in this book. It can change suitably according to the meaning of invention.

It is sectional drawing which shows a part of image sheet which concerns on this invention.

Explanation of symbols

1 image sheet 11 base layer 12 first image layer 13 second image layer 14 intermediate layer 15 third image layer 16 protective layer

Claims (5)

A base layer made of a translucent sheet,
A first image layer comprising a first image formed on one surface of the base layer;
A second image layer comprising a second image formed on the other surface of the base layer;
An intermediate layer made of a transparent or translucent sheet-like material provided on the first image layer;
A third image layer provided on the intermediate layer;
An image sheet for both transmitted light and reflected light. The base layer is a milky white flexible sheet using a synthetic resin material,
The first image layer and the second image layer are formed by printing on the surface of the base layer with an ink jet printer.
The image sheet for both transmitted and reflected light according to claim 1. The intermediate layer has a function of absorbing ultraviolet rays,
The image sheet for both transmitted and reflected light according to claim 2. The intermediate layer is adhered to the surface of the first image layer;

The reflection degree of light on the surface is larger than that of the base layer.
The image sheet for both transmitted and reflected light according to claim 3. The third image layer is formed by printing on the surface of the intermediate layer with an ink jet printer, and the density of the image is lower than that of the first image.
The image sheet for both transmitted light and reflected light according to claim 3 or 4.