JP2006072213A - Image sheet and lens-like sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain an image sheet constituted so that a printed object (image) can be observed through a lens-like sheet while viewing at a certain angle, and also, the rear side of the printed object can be transmitted while viewing at another angle, and to obtain the lens-like sheet used for the image sheet. <P>SOLUTION: On the rear side of the lens-like sheet 1 constituted by forming many convex lenses 3 having projected lines on the surface of a transparent synthetic resin sheet 2, and also, forming many flat parts which are parallel to the convex lenses, printing is displayed so that the image can be observed through the lens-like sheet, and the image sheet is constituted so that the position corresponding to the flat part of the lens-like sheet may function as a non-printed part. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an image sheet using a lens-like sheet in which a large number of convex lenses forming ridges are formed on the surface of a transparent synthetic resin sheet, and a lens-like sheet used for the image sheet.

Conventionally, a lenticular sheet has been used for observing a printed planar image as a three-dimensional image or for observing an image that varies depending on the viewing angle. And the printed matter which can observe a three-dimensional image and a different image using a lenticular sheet is used also for a product package other than a decoration.
However, in order to use it as a product package, it may be required that the product stored inside can be recognized from the outside. However, in a conventional lens-like sheet, the lens shape can be observed from any angle. The printed image displayed on the back side of the sheet is only observed, and the inside cannot be seen through.

FIG. 6 is a perspective view of a conventional lenticular sheet 51, in which a large number of convex lenses 53 that are convex ridges having a convex arc shape in cross section are arranged in parallel on the surface of the transparent synthetic resin sheet 52.
In order to allow the printed matter to be observed as a three-dimensional image or a plurality of types of images using the lens-like sheet 51, the print 54 is represented at a position corresponding to the continuous portion of the convex lens on the back surface of the lens-like sheet.
Here, the light from the back side received by the observer is refracted by the convex lens, and an image is observed from any angle, and the back side of the lenticular sheet 51 cannot be seen through (FIG. 6).

JP-A-11-72849 Japanese Patent Application Laid-Open No. 2004-4682

As described below, the present invention is characterized in that a flat portion is formed on a lenticular sheet, and the above-mentioned patent document also has a flat portion formed on a lenticular lens.
However, the lenticular lens in the invention disclosed in each of the above documents is used as a transmission screen in combination with a Fresnel lens sheet, and is used for the purpose of obtaining a three-dimensional image or the like as in the present invention. is not. In addition, the lenticular lens itself has convex lenses formed on both sides of the sheet.

  The present invention is used for an image sheet in which a printed material (image) can be observed through a lenticular sheet from a certain angle depending on the viewing angle, and the back side of the printed material can be seen through from another angle, and the image sheet. It is an object of the present invention to obtain a lens-like sheet, that is, to obtain an image sheet and a lens-like sheet therefor that can visually recognize a product stored in the package when used in a package.

  In relation to the above problems, the above Patent Documents 1 and 2 do not have any problems, and the problem is to prevent moiré when a transmissive screen is configured in combination with a Fresnel sheet. The present invention does not occupy a position as a prior art.

The invention of claim 1 is formed by closely contacting a number of convex lenses forming a convex line on the surface of the transparent synthetic resin sheet, and on the back surface of the lens-shaped sheet in which a belt-like flat portion is formed along the longitudinal direction of the convex lens. Printing is displayed so that an image can be observed through the lenticular sheet. The printing is performed by leaving a strip-shaped non-printed portion at the position corresponding to the plane portion, and observing the image at a certain observation angle when viewed from the front side, and seeing through the sheet at another angle. It constitutes a sheet.
The printing display includes a method of directly printing on the back surface of the lenticular sheet and a method of laminating a printed transparent sheet.

  The invention of claim 3 or less relates to a lenticular sheet used in the invention of claim 1 and is formed by closely contacting a number of convex lenses forming convex stripes on the surface of the transparent synthetic resin sheet, and the length of the convex lens. A belt-like plane portion is formed along the direction. The position of the plane portion may be either the upper part or the side part of the convex lens. When the planar part is formed on the side part, there are those formed only on one side of the convex lens and those formed on both sides.

There is no particular limitation on the width of the flat portion in the present invention. When the ratio of the width of the part having the lens function of the convex lens and the width of the flat part has a high ratio of the width of the part having the lens function, the viewing angle for observing the image is large, and the ratio of the flat part is high. The viewing angle at which the image can be observed is narrowed, but is appropriately selected according to the purpose of use.
Further, the flat portion is not necessarily provided on the entire lens-like sheet. For example, a mode in which a flat surface portion is provided only in one section (for example, 10 cm square) of the lenticular sheet or a mode in which a flat surface portion is provided only in a part (for example, 1/2) of the entire length of the convex lens is also conceivable. In this case, the portion provided with the flat portion can be observed through the back side of the lens-like sheet, but the image can be observed at a portion where the flat portion is not present when observed at the same angle. .
In the present invention, the “position corresponding to the plane portion” refers to a position where a light beam from a direction perpendicular to the plane portion hits the back surface of the sheet.

In the invention of claim 1, a planar portion is formed in the lenticular sheet, and the printing leaves a non-printed portion at a position corresponding to the planar portion of the lenticular sheet. Therefore, when the image sheet is observed from a direction perpendicular to the flat portion, the light passing through the flat portion is light transmitted through the non-printing portion, and the light passing through the convex lens is light that does not focus on the printing portion. Yes, the light transmitted through the image printing portion is not recognized by the observer.
That is, the observer recognizes the light transmitted through the non-printed portion, and can observe the back side of the image sheet.
On the other hand, when the three-dimensional sheet is observed from an angle other than a right angle with respect to the plane portion, the convex lens is focused on the printed portion, and an image of the printed matter can be observed.

  In the invention of claim 3 or less, the back surface of each lenticular sheet is printed with a non-printing portion in the same manner as in the invention of claim 1, or the printed sheet is layered. Thus, the effect of the three-dimensional image sheet of claim 1 can be obtained.

  Examples will be described below.

A lens-shaped sheet 1 shown in FIG. 1 has a large number of convex lenses 3 having a circular arc section in close contact with the surface of a transparent synthetic resin sheet 2, and is arranged in parallel with the back surface of the sheet 1 above each convex lens 3. The flat portion 4 is formed over the entire length of the convex lens 3.
An image is printed on the back surface of the lens-shaped sheet 1 configured as described above. This image is printed as the printing unit 5 only on both sides of the convex lens 3 and on the part where the flat part is not formed, and the part corresponding to the flat part 4 (directly below the flat part) is the non-printing part 6. .
The focal point 7 of the convex lens 3 is positioned in the non-printing part 6 (or not in the printing part).
The image sheet is configured as described above.

When this image sheet is observed from a direction perpendicular to the plane portion 4 (FIG. 2), light from the back side of the lens-like sheet 1 passes through the lens plan view 4 as it is. Further, since the focal point of the convex lens 3 is located in the non-printing part 6 (not in the printing part), the design is hidden.
Therefore, when the three-dimensional image sheet is observed from the direction indicated by the arrow in FIG. 2, no image is observed and the back surface of the image sheet can be transmitted.

On the other hand, when the image sheet is observed obliquely as shown in FIG. 3, the focal point 7 of the convex lens 3 is located in the printing unit 5. In addition, the opening width of the flat surface portion 4 is reduced, and light from the back surface is refracted by the flat surface portion, so that light transmitted through the flat surface portion 4 is reduced.
Accordingly, a three-dimensional image or a plurality of types of images can be observed through the convex lens 3 and the amount of light transmitted through the flat surface portion is reduced, so that the back surface of the image sheet becomes difficult to see.
In other words, when a package is formed from this image sheet, a product stored inside can be observed when viewed from the front, and a three-dimensional image or a plurality of types of images can be observed when observed from an oblique direction.

4 and 5 show a belt-like flat portion 4 formed on one side surface of the convex lens 3. Here, a portion corresponding to the plan view 4 (portion where light perpendicular to the plane portion 4 strikes the back surface of the sheet 1) is a non-printing portion 6 and the remaining portion is printed 5.
In this case, the back surface of the image sheet can be seen through when viewed from a direction perpendicular to the plane portion 4 shown in FIG. 4, that is, when observed from an oblique direction, and the arc surface of the convex lens 3 shown in FIG. Images can be observed when viewed from the side.

According to the present invention, a three-dimensional image or a plurality of types of images can be observed depending on the viewing angle, or the back side of the image sheet can be seen through. Therefore, when the product package is configured by the image sheet of the present invention, a product package can be obtained in which the printed image can be observed according to the viewing angle, and the product stored therein can be observed when viewed from another angle.
When the image sheet of the present invention is attached to a window glass, the image can be observed depending on the viewing angle, and the opposite side of the window glass can be seen through from another angle.
As described above, the image sheet according to the present invention has various uses as an image sheet that can be seen through, and has industrial applicability.
The lens-like sheet of the present invention also has industrial applicability as a constituent material for the image sheet as described above.

The perspective view of the lens-shaped sheet | seat of Example 1. FIG. Sectional drawing which shows the optical characteristic when observed from the front of Example 1 Sectional drawing which shows the optical characteristic when it observes from the diagonal of Example 1 Sectional drawing which shows the optical characteristic when observed from the plane side of Example 2 Sectional drawing which shows the optical characteristic when observed from the arc surface side of Example 2 Perspective view of a conventional lenticular sheet Sectional drawing which shows the optical characteristic when observed from the front of the conventional lenticular sheet

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lenticular sheet 2 Synthetic resin sheet 3 Convex lens 4 Plane part 5 Printing part 6 No printing part 7 Focus

Claims (4)

An image is formed through the lens-like sheet on the back surface of the lens-like sheet formed with a plurality of convex lenses forming convex stripes in close contact with the surface of the transparent synthetic resin sheet, and a belt-like flat portion is formed along the longitudinal direction of the convex lens. The print is displayed for observation,
The printing is displayed leaving a strip-shaped non-printing portion at the position corresponding to the plane portion,
The image was observed at one observation angle when observed from the front side, and the sheet was seen through at another angle.
Image sheet The image sheet according to claim 1, wherein the flat portion is formed on an upper portion or a side portion of the convex lens. A lens-shaped sheet in which a large number of convex lenses forming convex stripes are formed in close contact with the surface of the transparent synthetic resin sheet, and a belt-like flat portion is formed along the longitudinal direction of the convex lens. The lens-like sheet according to claim 3, wherein the flat part is formed on an upper part or a side part of the convex lens.

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