WO2020162079A1

WO2020162079A1 - Image display body

Info

Publication number: WO2020162079A1
Application number: PCT/JP2019/051309
Authority: WO
Inventors: 匠真河本; 佐雅仁中村; 徹鴨崎
Original assignee: 富士フイルム株式会社
Priority date: 2019-02-06
Filing date: 2019-12-26
Publication date: 2020-08-13

Abstract

This image display body is provided with a lenticular lens sheet and an image formation layer. The image formation layer has at least three images (a first image, a second image, and a third image). In each of the first image, the second image, and the third image, the same mark of the same size that is disposed at the corresponding same position is inserted. The color of the mark is distinguishable from the color of a mark background part that is the background of the mark. The color of the mark background part and the color of the mark change in the process of switching from the first image to the third image. The number of times the color of the mark changes is smaller than the number of times the color of the mark background part changes.

Description

Image display

The present disclosure relates to an image display body.

An image display using a lenticular lens sheet is known as a medium that displays different images depending on the viewing angle. An image display using a lenticular lens sheet is composed of a lenticular lens sheet and an image forming layer. The lenticular lens sheet is a sheet in which a plurality of convex cylindrical lenses are arranged and which has a flat surface on the side opposite to the convex shape. The image forming layer is provided on the flat surface side of the lenticular lens sheet. The image forming layer has, for example, two images, a first image and a second image, the first image is composed of a plurality of first divided images divided into strips, and the second image is a strip. It is composed of a plurality of second divided images divided into.

The first divided image and the second divided image are arranged along the arrangement direction of the cylindrical lens in the unit area corresponding to one cylindrical lens. When the observation direction observed through the lenticular lens sheet changes, the angle observed by the viewer changes with respect to the cylindrical lens. Then, depending on the angle of observation, the viewer can visually recognize only one of the first divided image and the second divided image. Thereby, the visually recognized image is switched between the first image and the second image. Further, by providing the image forming layer having three or more images, three or more images can be switched and visually recognized. Switching the image to be visually recognized according to the viewing direction using the lenticular sheet is called image changing or the like.

International Publication No. 2016/174917 discloses a decorative sheet including a lenticular lens sheet, in which an image forming layer has a first pattern (first image) and a second pattern (second image) whose densities are mutually inverted. In addition, a configuration including a gradation pattern (third image) has been proposed. In the image forming layer, a first divided image, an intermediate region composed of divided images of gradation patterns, and a second divided image are sequentially arranged in a unit area corresponding to one cylindrical lens. By switching between the first image and the second image in which the densities are reversed, for example, when the pattern is a carbon fiber fabric pattern, the lightness and darkness of the fabric pattern appear to change, so that a three-dimensional effect can be obtained, and a real image can be obtained. A texture similar to that of the carbon fiber sheet can be obtained. Further, by providing the intermediate region, the gradation pattern of the third image is observed while the first image and the second image are switched, so that the images can be smoothly switched.

International Publication No. 2016/159271 relates to a display provided with a lenticular lens sheet, and in an image forming layer, between adjacent display image rows having different colors, one color of an adjacent display image row and A configuration in which an interpolated image sequence having a color between the other color and the other color is arranged is disclosed. According to the technique of WO 2016/1592721, the interpolation image (third image) is displayed during the switching from the first image to the second image, so that the first image and the second image are displayed. It is possible to suppress so-called crosstalk, which makes it difficult to distinguish both images due to overlapping.

The inventors are considering using multiple different images including a common mark as images to be combined with the lenticular lens sheet, and switching these multiple images according to the viewing direction. Here, the common mark refers to the same mark arranged in the same position corresponding to each image with the same size. The mark is a character, a figure, a symbol, a combination of these, or a combination of these and a color. Then, in each of a plurality of images including a common mark, if the color of the mark and the color of the background of the mark that is the background of the mark are different, then each of the mark and the background of the mark will be different. , It is possible to enjoy the color change according to the viewing direction.

There are various images that include the mark, and one of them is, for example, an image of a business card that includes characters such as the name of a person and the name of the organization to which the mark belongs. Here, consider combining the image of this business card with a lenticular lens sheet. By making the images of a plurality of business cards containing common characters different colors, a business card whose color changes according to the viewing direction is completed.

In this case, the more the color changes in the process of switching multiple images according to the viewing direction, the more interesting the visual effect becomes. However, when a character is important information such as a business card, it is desired that the character can always be displayed clearly regardless of the viewing direction, even if the color changes.

When combining a lenticular lens sheet with multiple images containing a common mark, such as the image of a business card given as an example, even if the color of the mark background is changed according to the viewing direction, In some cases, it is preferable that the chapter can always be displayed clearly regardless of the viewing direction while the color changes. The inventors have been considering measures for that.

International Publication No. 2016/174917 improves the texture of a pattern by switching between a first image and a second image of the same pattern whose densities are reversed. However, in International Publication No. 2016/174917, a repeating pattern such as a woven fabric including a carbon fiber sheet is assumed as a picture, and it is not assumed that an image including a mark is displayed.

International Publication No. 2016/159271 discloses that between the first image and the second image, when the first image and the second image include different characters such as numbers “2” and “3”, respectively. This is a technique for suppressing crosstalk between the first image and the second image by inserting an interpolated image that does not include a character in. Therefore, it is not a solution to the above problems that the inventors are studying.

The technology of the present disclosure uses a lenticular lens sheet, and in an image display body in which a plurality of images including a common mark are switched, even if the color of the mark background portion changes according to the viewing direction, the mark With respect to the above, it is an object of the present invention to provide an image display body capable of ensuring good visibility regardless of the viewing direction while the color changes.

The image display of the present disclosure has a plurality of arranged cylindrical lenses having a convex shape, a lenticular lens sheet having a flat surface on the side opposite to the convex shape, and a flat surface side. An image forming layer having at least three images of a third image, each of the first image, the second image and the third image being composed of a plurality of divided images. A first image, a second image, and a third image that are switched in the order of the first image, the second image, and the third image when the observation direction for observing through the lenticular lens sheet changes. The same mark placed in the same position and in the same size is inserted in each of them, and the color of the mark is different from that of the background of the mark, which is the background of the mark. The number of times that the color of the background of the mark and the color of the mark change, and the color of the background of the mark changes in the process of switching from the first image to the third image, The color of the mark changes less often.

It is preferable that the color of the background of the mark changes twice and the color of the mark changes once in the process of switching from the first image to the third image.

The color of the mark on the second image is preferably the same as the color of the mark on the first image or the color of the mark on the third image.

It is preferable that the color of the mark background portion of each of the first image, the second image, and the third image be changed stepwise between the first image, the second image, and the third image.

The first image, the second image, and the third image are monochrome images, the first image and the third image are images in which the shades of the first image and the third image are reversed, and the color of the mark background portion of the second image is the first image. It may be an intermediate color having an intermediate density with the density of the background portion of the mark and the density of the background portion of the second image.

In the first image, the background color of the mark is white and the color of the mark is black. In the third image, the background color of the mark is black and the color of the mark is white. In the second image, the color of the background of the mark may be gray and the color of the mark may be black or white.

In the image forming layer, it is preferable that at least one divided image of each of the first image, the second image, and the third image is arranged in a unit area corresponding to one of the cylindrical lenses.

A plurality of divided images of each of the first image, the second image, and the third image may be continuously arranged in the unit area of the image forming layer.

The first image, the second image, and the third image may be images that differ only in color.

The image forming layer has a fourth image in addition to the first image, the second image and the third image, and the fourth image also has the same position corresponding to each of the three images from the first image to the third image. The same mark placed in the same size is inserted in the, and the color of the mark of the fourth image is the same as the color of the mark of the second image or the mark of the third image, When the observation direction of observing the image forming layer through the lenticular lens sheet is changed, the first image, the second image, the fourth image and the third image are switched in this order, and the first image, the second image and the fourth image are passed. , In the process of switching to the third image, the color of the background of the mark changes twice or three times, whereas the number of times the color of the mark changes changes the color of the background of the mark. It is preferably once when the number of times is two, and once or twice when the number of times the color of the mark background portion changes is three.

According to the image display body of the present disclosure, in the image display body in which a plurality of images including a common mark are switched using the lenticular lens sheet, the case where the color of the mark background portion changes depending on the viewing direction, Also, it is possible to ensure good visibility regardless of the viewing direction, while the color of the mark changes.

It is a perspective view showing composition of an image display object of this indication. It is explanatory drawing explaining the 1st image, 2nd image, and 3rd image contained in an image forming layer. It is a figure which shows the structure of a 1st image. It is a figure which shows the structure of a 3rd image. It is a figure which shows the structure of a 2nd image. It is explanatory drawing of the lightness of Munsell for expressing shading. It is an explanatory view of a plurality of division pictures arranged in a unit field of a cylindrical lens. It is a principal part transverse cross-sectional view which cut|disconnected the image display body of 1st Embodiment along the arrangement direction of a cylindrical lens. It is a figure which shows an example of a hue circle. It is a figure which shows the example of a design change of a 2nd image. It is explanatory drawing of the 1st image, the 2nd image, and the 3rd image which have mutually different background images. It is an explanatory view of a plurality of division pictures arranged in a unit field of a cylindrical lens of a 2nd embodiment. It is explanatory drawing of the image observed by the image display body of 3rd Embodiment. It is a figure which shows the structure of a 4th image. It is explanatory drawing of the image observed by the image display body of a modification.

Hereinafter, an embodiment of the image display body of the present disclosure will be described with reference to the drawings.

"First embodiment"
As shown in FIG. 1, the image display body 10 is an image display sheet including a lenticular lens sheet 11 and an image forming layer 13. In FIG. 1, for convenience, the image forming layer 13 and the lenticular lens sheet 11 are shown as separated, but in reality, the image forming layer 13 is formed on one surface of the lenticular lens sheet 11.

The lenticular lens sheet 11 is composed of a plurality of cylindrical lenses 15. Each cylindrical lens 15 has a semi-cylindrical convex shape 15A, and the side opposite to the convex shape 15A is flat. The longitudinal direction of each cylindrical lens 15 extends in the Y direction, and the cylindrical lenses 15 are arranged in parallel with the adjacent cylindrical lenses 15. That is, the cylindrical lenses 15 are arranged at a constant pitch in the X direction orthogonal to the Y direction. In this example, the X direction is the arrangement direction of the plurality of cylindrical lenses 15. The lenticular lens sheet 11 has a flat surface 11A on the side opposite to the convex shape 15A.

As the material of the lenticular lens sheet 11, a transparent resin material such as PET (polyethylene terephthalate), PP (polypropylene), PETG (glycol-modified polyethylene terephthalate), polycarbonate, acrylic, acrylate resin is used.

The image forming layer 13 is provided on the flat surface 11A side of the lenticular lens sheet 11. The image forming layer 13 is directly formed on the flat surface 11A by printing or transferring an image on the flat surface 11A. The material of the image forming layer 13 is not particularly limited as long as it is a material that can adhere to the flat surface 11A of the lenticular lens sheet 11, and a known paint or the like is used.

Note that the image forming layer 13 does not have to be directly formed on the lenticular lens sheet 11. For example, the image forming layer 13 may be formed on a sheet different from the lenticular lens sheet 11, and the sheet on which the image forming layer is formed may be joined to the lenticular lens sheet 11 by a method such as adhesion or adhesion. As a bonding agent such as an adhesive or a pressure-sensitive adhesive, a transparent material is preferably used so that the image forming layer 13 can be observed through the lenticular lens sheet 11.

As shown in FIG. 2, the image forming layer 13 includes, for example, a first image P1 shown in A of FIG. 2, a second image P2 shown in B of FIG. 2, and a third image P3 shown in C of FIG. It is composed of. In the present example, the first image P1, the second image P2, and the third image P3 are each a character and a character background portion that is a background of the character (see reference numerals B1, B2, and B3 in FIG. 3 and the like). Is an image that includes a different color. The character background portion will be described later. The character is one form of the mark, and the character background part is one form of the mark background part. In the present specification, a mark is a character, a figure, a symbol, a combination of these, or a combination of these and a color, and is a concept including a symbol mark, a logo mark, a trademark, and the like. The character is a concept including at least one of kanji, kana, alphabet, number, pictogram, and the like. When a character is used as a mark, it may be one character or a character string including a plurality of characters. Examples of the character string include a name, a trade name, a product name, and an address. The figure is a set of faces, lines and points, and may be a pattern such as stripes or polka dots. In the following description, the characters and the character background part can be read as the mark and the mark background part.

In this example, the first image P1, the second image P2, and the third image P3 have the same design of the entire background including characters and the character background portion, and differ only in color. The character included in the image is a character string "OPERAPATH". In addition, in the technique of the present disclosure, characters are commonly provided in the first image P1, the second image P2, and the third image P3. More specifically, the character is the same character that is common to each of the first image P1, the second image P2, and the third image P3, and refers to the same character that is arranged in the same corresponding position with the same size. .. Here, “identical” is a concept including substantially the same including an error of about ±10%.

Although details will be described below, when the image forming layer 13 is observed through the lenticular lens sheet 11, if the observation direction is changed to one direction, the first image P1, the second image P2, and the third image P3 are visually recognized in this order. To be done.

In this example, the first image P1, the second image P2, and the third image P3 are monochrome (hereinafter referred to as “monochrome”) images. Here, an achromatic image, that is, a black and white image composed of white, black, and gray of various densities is used. The first image P1 and the third image P3 are images whose shades are reversed.

As shown in FIG. 3, the first image P1 of this example is an image including a character C1 of "OPERAPATH" displayed in white and a black character background portion B1 in which the character C1 is arranged. As shown in FIG. 3, the first image P1 is composed of a first background image P11 in which the color of the entire background including the character background portion B1 is black, and a first character image P12 of the white character C1. , The first background image P11 and the first character image P12 are superimposed. 3 to 5, the white character C1 of the first character image P12 is shown as an outline character having a black edge, but the character C1 in the first character image P12 is white without a border. It is a character.

In the first image P1, the character C1 is white, and the color of the character background portion B1 in which the character is arranged in the background is black. Therefore, the character C1 has an identifiable density with respect to the color of the character background portion B1. There is a difference (brightness difference). That is, the character C1 has a color that is distinguishable from the color of the character background portion B1. The detailed meaning of having a distinguishable color with respect to the color of the character background portion will be described later.

In the first background image P11, a horse is drawn on the right side in FIG. 3, and the upper left part includes a gradation part in which the shade changes slightly.

Here, the character background portion is an outer region surrounding a character or a character string inserted in the image in the background of the entire image, and is at least 10% or more larger than the size of the character (including the character string). The area corresponding to the size. For example, if the size of the inserted character is 10 points, the character background portion includes at least an area that can accommodate a character having a size of 11 points. If the character background portion has at least this size, the characters to be inserted can be recognized by making the respective colors of the character background portion and the character identifiable.

That is, in the entire background such as the first background image P11, the character background portion is the minimum area in which a color that can be distinguished from the color of the character needs to be arranged in order to recognize the character. Therefore, if the color of the character background part and the color of the character can be distinguished, the color of the character background part may be the same color as the entire background of the image, or the character background part and other areas in the entire background may be different. Different colors are acceptable. Further, as in this example, an object such as a horse may be drawn in the area other than the character background portion in the background. The pattern included in the background may be something other than an object such as a horse, a car, a person, or a mountain, and may be a pattern including a gradation, a check pattern, or the like.

Like the first image P1, the third image P3 is an image including a character C3 of "OPERAPATH" displayed in black and a white character background portion B3 in which the character C3 is arranged. A part of the background includes a horse pattern and a gradation part where the shade changes. As shown in FIG. 4, the third image P3 is composed of a third background image P31 based on white including a white character background portion B3 and a third character image P32 of the black character C3. It is an image in which the background image P31 and the third character image P32 are superimposed.

In the third image P3, the character C3 is black, and the color of the character background portion B3 in which the character is arranged in the background is white. Therefore, the character C3 has an identifiable density with respect to the color of the character background portion B3. There is a difference (brightness difference). That is, the character C3 has a color that is distinguishable from the color of the character background portion B3.

The second image P2 has the same design as the first image P1 and the third image P3. The second image P2 is an image including a character C1 of "OPERAPATH" displayed in the same white as the first image P1 and a gray character background portion B3 in which the character C1 is arranged. A part of the background includes a horse pattern and a gradation portion where the shade changes. As shown in FIG. 5, the second image P2 is composed of a second background image P21 based on gray including a gray character background portion B2 and a first character image P12 of the white character C1. It is an image in which the background image P21 and the first character image P12 are superimposed.

In the second image P2, the character C1 is white and has a distinguishable density difference (brightness difference) with respect to the gray color of the character background portion B2 in which the character is arranged in the background. That is, the character C1 has a distinguishable color with respect to the color of the character background portion B2. On the other hand, in the second image P2, the background is a gray image with a low contrast of light and shade as a whole, and the horse pattern included in the background is blended into the whole and is unclear.

Grey is an intermediate color between white and black. That is, the color of the character background portion B2 in the second image P2 is an intermediate color between the black color of the character background portion B1 of the first image P1 and the white color of the character background portion B3 of the third image P3.

In the present specification, a color between one of the two different colors and the other color is referred to as an intermediate color between the two different colors. Here, the middle of the intermediate colors does not necessarily mean the median of the density values of the two colors as long as it is the density value, and may be biased to one of the density values of the two colors. It is meant to include all cases existing between the density values of two colors. In a monochrome image, two different colors mean colors having different densities, and an intermediate color has a density between the two densities. For example, for the same corresponding position a in each of the images P1 to P3 shown in FIG. 2, the density na1 at the position a of the first image, the density na2 at the position a of the second image, and the density na3 at the position a of the third image are na3. , The relationship is na1>na2>na3. That is, the density na2 of the second image is between the density na1 of the first image and the density na3 of the third image. Further, regarding the corresponding position b in each of the images P1 to P3 shown in FIG. 2, the density nb1 at the position b of the first image, the density at the position b of the second image is nb2, and the density at the position b of the third image is nb3. In this case, the relationship is nb1<nb2<nb3. That is, the density nb2 of the second image is between the density nb1 of the first image and the density nb3 of the third image.

In the case of a monochrome image, the character having a color that can be distinguished from the color of the character background portion means that the character is a color that can be visually recognized clearly due to the difference in shade (brightness) thereof. Specifically, the difference in light and shade can be defined as the difference in lightness of the Munsell display system (Munsell lightness). It should be noted that the lightness and the light and shade have a relationship that the higher the lightness, the lower the density, and the lower the lightness, the higher the density. FIG. 6 shows the brightness in the Munsell display system. An ideal white surface having a luminous reflectance of 100% is Munsell lightness 10, and an ideal black surface having a luminous reflectance of 0% is Munsell lightness 0. Numerical values from 10 to 10. The color of the character and the color of the character background portion can be distinguished as long as the brightness is 3 or more.
In this example, an achromatic monochrome image is described as an example of a monochrome image, but a monochrome image having a sepia tone or a chromatic color such as red and white may be used as the monochrome image.

As shown in FIG. 7, the first image P1, the second image P2, and the third image P3 are divided into a plurality of strip-shaped first divided images SP1, a plurality of second divided images SP2, and a third divided image, respectively. It is composed of SP3. A part of the first image P1 is drawn in each of the plurality of first divided images SP1. The same applies to the second divided image SP2 and the third divided image SP3. In addition, the plurality of divided images divided into these strips are adjusted in size and arranged in correspondence with each unit region UR of the cylindrical lens.

On the flat surface 11A of the lenticular lens sheet 11, the first divided image SP1 is arranged with the longitudinal direction along the Y direction. In other words, the longitudinal direction of the first divided image SP1 is arranged along the longitudinal direction (Y direction) of the cylindrical lens 15. The same applies to the second divided image SP2 and the third divided image SP3.

In the image forming layer 13, a first divided image SP1, a second divided image SP2, and a third divided image SP3 are arranged in each unit area UR corresponding to each cylindrical lens 15. That is, a set of three divided images of the first divided image SP1, the second divided image SP2, and the third divided image SP3 is arranged in one unit area UR.

The width of the unit area UR in the X direction corresponds to the width of the cylindrical lens 15 in the X direction. In this example, the first divided image SP1, the second divided image SP2, and the third divided image SP3 have the same width.

FIG. 8 shows a cross section of the image display body 10 in the X direction. As shown in FIG. 8, the image display body 10 is observed from the side having the convex shape 15A of the lenticular lens sheet 11. The convex shape 15</b>A of the cylindrical lens 15 has a curvature set such that the focus thereof is located on the image forming layer 13.

In each unit area UR shown in FIG. 8, the first divided image SP1, the second divided image SP2, and the third divided image SP3 are arranged in this order from the left side. By the action of each cylindrical lens 15, of the first divided image SP1, the second divided image SP2, and the third divided image SP3 in each unit region UR, the image visually recognized by the viewer changes according to the observation direction.

When the image forming layer 13 is observed from the image display body 10 in the first direction D1 inclined to the right from the direction orthogonal to the flat surface 11A, only the first divided image SP1 is observed. When the image display layer 10 is observed in the image forming layer 13 from the second direction D2 which is the direction orthogonal to the flat surface 11A, only the second divided image SP2 is observed. Further, when the image forming layer 13 is observed from the image display body 10 in the third direction D3 which is inclined leftward from the second direction D2, only the second divided image SP2 is observed.

A part of the first image P1 is formed in the first divided image SP1, a part of the second image P2 is formed in the second divided image SP2, and a part of the third divided image SP3 is formed. A part of the third image P3 is formed. Therefore, the image display body 10 changes the observation direction to be observed through the lenticular lens sheet 11 in the order of the first direction D1, the second direction D2, and the third direction D3, so that the first image P1 and the second image P1 The image P2 and the third image P3 are sequentially observed.

The operation of the above configuration will be described with reference to FIG. When the observation direction of the image display body 10 is changed to one direction, the first image P1 shown in A of FIG. 2, the second image P2 shown in B of FIG. 2, and the third image P3 shown in C of FIG. The visible image switches. The colors of the character background portions of the first image P1, the second image P2, and the third image P3 are different. Therefore, when the three images of the first image P1 to the third image P3 are switched, the color of the character background portion changes for each image. On the other hand, since the characters in the first image P1 and the second image P2 have the same color, they do not change when switching from the first image P1 to the second image P2. Since the character colors of the second image P2 and the third image P3 are different, the character color changes when the images of the second image P2 and the third image P3 are switched. That is, in the process of switching the first image P1, the second image P2, and the third image P3, the color of the character and the color of the character background portion respectively change, but rather than the number of times the color of the character background portion changes. , The number of changes in the color of letters is small. Specifically, the color of the character background changes twice, whereas the color of the character changes once. That is, in the present example, in the process of switching the first image P1, the second image P2, and the third image P3, the color transitions to three colors in the order of black, gray, and white. Is twice from black to gray and from gray to white. On the other hand, the color of the character transitions to two colors in the order of black, white, and white, so the number of times the color of the character changes is once from black to white.

According to the image display body 10 of the present disclosure, in the image display body in which a plurality of images are switched, the color of the character background portion is changed according to the observation direction, and the character is changed regardless of the observation direction while changing the color. Good visibility can be secured. Further, by changing the color of the character background portion and the color of the character according to the viewing direction, it is possible to expect the effect of increasing the interestingness of the visual effect.

In each of the first image P1, the second image P2, and the third image P3, the character has a color that can be discriminated from the color of the character background portion, so that the character is Visibility is secured. That is, since the common character in the first image P1, the second image P2, and the third image P3 is clearly displayed in any of the images, it is always displayed clearly regardless of the viewing direction. Moreover, in the image display body 10 of the present disclosure, when the first image P1, the second image P2, and the third image P3 are switched, the number of times the color of the character changes more than the number of times the color of the character background changes. Less is. In this way, if the number of changes in the color of the character is less than the number of changes in the color of the background, the change in the color of the character is suppressed. Good visibility of characters can be secured as compared with the case of changing.

Further, for example, even when a plurality of images have a common character of the same color, if the color is distinguishable from the color of the character background portion in each image, the character can be visually recognized even if the viewing direction changes. There is a possibility that the sex can be secured. However, since the characters do not change even if the viewing direction changes, the image is not interesting. In this example, by changing the color of the character, an interesting visual effect can be generated as compared with the case where the color of the character does not change at all.

In this example, the case where the image included in the image forming layer is a monochrome image has been described, but it may be a color image. In the case of a monochrome image, it has been explained that different colors mean different lightness, but in the case of a color image, different colors mean that there are three attributes of color: lightness, saturation and hue. It means that either is different. Even in the case of a color image, the same action and effect are exhibited.

Further, in this example, the first image P1, the second image P2, and the third image P3 are the same images having different colors, and the first image P1 and the third image P3 are images in which the shade of the background is reversed. Yes, it is an image having the intermediate color of the background of the second image P2. That is, the color of the character background portion of the first image P1, the second image P2, and the third image P3 changes stepwise among the first image P1, the second image P2, and the third image P3.

　The color changes stepwise means that the brightness changes stepwise in the case of a monochrome image as in this example.

The gradual change in brightness means that the brightness changes at different positions in one direction along the axis of the brightness of the Munsell display system shown in FIG. For example, the lightness at the position a of the first image P1 is 2, the lightness at the position a of the second image P2 is 5, and the lightness at the position a of the third image P3 is 8; In this case, the lightness at the position b of the first image P1 is 9, the lightness at the position b of the second image P2 is 5, and the lightness at the position b of the third image is 1, so that the lightness gradually changes. Including cases and.

When the first image, the second image, and the third image are switched in this order, the color of the character background changes stepwise, so the change in color is gradual and a natural change can occur. Particularly, in this example, the first image, the second image, and the third image are images having different colors only, and the colors of the entire background are gradually changed. The change in the color of the entire background at the time of switching the third image becomes gradual, and the color change due to the natural image switching can be enjoyed.

In addition, in the second image in which the character background portion has a neutral color, when the character is gray with the character background portion, which is an intermediate color, the gray character is buried in the gray character background portion, and the visibility of the character is significantly reduced. To do. However, in this example, since the character has a color that can be distinguished from the color of the character background even in the second image having the character background of the intermediate color, the visibility of the character is deteriorated even when the second image is viewed. It is identifiable well without

In the case of a color image, “gradual change in color” means that at least one of lightness, saturation, and hue is gradually changed. The lightness is as described above, and similarly, the gradual change in the saturation means that the saturation changes at different positions in one direction along the saturation axis.

▽ Hue changing stepwise means changing to different hues at different positions on the hue circle, clockwise or counterclockwise along the hue circle. Further, the change in hue will be described using the hue circle of the Munsell display system shown in FIG. The hue circle represents the classification of chromatic colors. For example, in a Munsell hue circle divided into 20 colors, changing the hue means changing from a reference hue to another hue arranged along the hue circle, and the hue changes stepwise. This means that the hue changes in the order of arrangement along the hue circle. However, the intermediate color in the hue means the hue arranged on the side where the length of the arc between the one hue and the other hue of the two different colors is short.

In FIG. 9, the symbols are R: red, YR: yellow red, Y: yellow, GY: yellow green, G: green, BG: blue green, B: blue, PB: purple blue, P: purple, R, respectively. : Means reddish purple. In the hue circle shown in FIG. 12, hues obtained by further dividing each of these 10 kinds of hues into two (for example, 5R and 10R for R) are displayed.

Here, the hues that the intermediate colors can assume will be described assuming that the first image, the second image, and the third image are color images. For example, when the hue of the color at the position a of the first image P1 is 5R and the hue of the color at the position a of the third image P3 is 5B, it can be taken as the hue of the position a of the second image P2 having an intermediate color. Is a hue located between 5R and 5P to 5B. On the other hand, for example, when the hue at the position a of the first image P1 is 5R and the hue at the position a of the third image P3 is 5BG, 5R and 5BG are at positions facing each other with respect to the center of the hue circle, The 10PB side arc and the 10Y side arc have the same length. In this case, as the hue of the color at the position a of the second image P2 which is the intermediate color, any hue other than 5R and 5BG can be taken.

Even when the image included in the image forming layer is a color image, the color of the character background portion of each of the first image, the second image, and the third image is different from that of the first image, the second image, and the third image. When the three images are changed in a stepwise manner, the color of the character background portion is changed in a stepwise manner when the first image, the second image, and the third image are switched in this order, so that the color change is gentle. It can cause natural changes.

"Modification 1"
In the above-described embodiment, the character color of the second image P2 is the same as the character color of the first image P2, but the character color of the second image P2 may be any color that can be distinguished from the background. The color of the character of the three images P3 may be the same. That is, as shown in FIG. 10, as a design modification example of the second image, a design modification image in which the second background image P21 having the gray character background portion B2 and the third character image P32 of the black character C3 are superimposed. P2-2 may be used instead of the second image P2 in the above embodiment.

In the design change image P2-2, the black character C3 has a distinguishable density difference with respect to the color of the character background portion B2 in which the character C3 is arranged. That is, the character C3 has a color that can be identified with respect to the character background portion B2.

In this example, when the observation direction is changed to one direction, the first image P1, the design change image P2-2, and the third image P3 that are viewed in this order are switched. The colors of the character background portion of the first image P1, the design change image P2-2, and the third image P3 are different. Therefore, in the process of switching the three images of the first image P1 to the third image P3, the color of the character background portion switches for each image. Since the character colors of the first image P1 and the design change image P2-2 are different, the character color changes when the images of the first image P1 and the design change image P2-2 are switched. On the other hand, since the characters of the design change image P2-2 and the third image P3 have the same color, the color of the character does not change when the images of the design change image P2-2 and the third image P3 are switched.

That is, in this example, the timing at which the character color changes in the process of switching the image from the first image P1 to the third image P3 is different from that in the above embodiment.

On the other hand, in the process of switching from the image P1 to the third image P3, the character background part changes twice and the character color changes once, that is, the character color and the character background part color respectively change. However, the point that the change in the color of the character is less than the change in the color of the character background portion is the same as in the above embodiment.

Therefore, also in this example, in the image display body in which a plurality of images are switched, the color of the character background portion is changed according to the viewing direction, and the character is visually recognized regardless of the viewing direction while changing the color. It is possible to secure the sex. Further, by changing the color of the character background portion and the color of the character according to the viewing direction, it is possible to expect the effect of increasing the interestingness of the visual effect.

"Modification 2"
In the above embodiment, the case where the first image, the second image, and the third image are different only in color has been described, but the first image, the second image, and the third image are images including different patterns in the background. It may be. For example, as shown in FIG. 11, in the first image P1, the second image P2, and the third image P3, the positions of horses, which are patterns, may be different from each other.

In this example, when the observation direction is changed to one direction, the images visually recognized in order of the first image P1, the second image P2, and the third image P3 are switched, so that the horse as a pattern moves to the left. It can give an impression. In addition, since the color of the character and the color of the character background portion in each image are the same as those in the above-described embodiment, the color of the character background portion changes twice in the process of switching from the first image P1 to the third image P3. , The color of the character changes once, that is, the color of the character and the color of the character background part change respectively, but the point that the color of the character changes less than the color of the character background part changes. This is similar to the above embodiment.

Note that the patterns included in the backgrounds of the first image, the second image, and the third image are not limited to the related patterns as described above, and may be different patterns that are not related to each other.

"Second embodiment"
As shown in FIG. 12 showing the image forming layer 13 of the image display body of the second embodiment, in each unit region UR of the image forming layer 13, a plurality of divided images of the same image are continuously arranged. Good. In each unit area UR of the image forming layer 13 shown in FIG. 12, two first divided images SP1, two second divided images SP2, and three third divided images SP3 are continuously arranged. When the pitch of the cylindrical lenses in the present embodiment is equal to the pitch of the cylindrical lenses in the first embodiment, the compression rate of each divided image becomes larger than that in the first embodiment. In one unit area UR, the first divided image SP1, the first divided image SP1, the second divided image SP2, the second divided image SP2, the third divided image SP3, and the third divided image SP3 are arranged in order from the left. Has been done. The two first divided images SP1 in the unit area UR are the same divided image in which the same part of the first image P1 is formed. The same applies to the two second divided images SP2 and the two third divided images SP3 in the unit area UR. That is, the image forming layer 13 shown in FIG. 12 includes two each of the first image P1, the second image P2, and the third image P3.

When the viewing direction of the image display body is changed to one direction, the images are switched in order of the first image P1, the first image P1, the second image P2, the second image P2, the third image P3, and the third image P3. However, the viewer simply visually recognizes that the three images of the first image P1, the second image P2, and the third image P3 are switched.

That is, also in the present embodiment, as in the case of the image display body of the above-described first embodiment, when the three images of the first image P1 to the third image P3 are switched, the color of the character background portion is different for each image. Switch to 3 steps. On the other hand, since the characters in the first image P1 and the second image P2 have the same color, they do not change when switching from the first image P1 to the second image P2. Since the character colors of the second image P2 and the third image P3 are different, the character color changes when the images of the second image P2 and the third image P3 are switched. That is, when the first image P1 is switched to the third image P3, the color of the character and the color of the character background part change respectively, but the change of the character color is smaller than the color change of the character background part. .. Specifically, the color of the character background changes twice, whereas the color of the character changes twice.

Also in the present embodiment, as in the first embodiment, the color of the character background portion is changed according to the viewing direction, and the character is changed in color while ensuring good visibility of the character regardless of the viewing direction. can do. Further, by changing the color of the character background portion and the color of the character according to the viewing direction, it is possible to expect the effect of increasing the interestingness of the visual effect.

Further, in this example, a plurality of divided images of the same image are continuously arranged in each unit region UR of the image forming layer 13. As a result, rattling at the time of switching the image can be suppressed. In the image display body, when the angle changes within the angle range in which one image can be visually recognized, the position of the line of sight on one image changes in the arrangement direction of the divided images. The smaller the angular range for observing one divided image, the smaller the change in the position of the line of sight when the images to be observed are switched, and the less rattling. The number of consecutively arranged identical divided images in the unit region UR is not limited to two and may be three or more.

"Third Embodiment"
Further, in FIG. 12, instead of providing the two second images P2, the second image P2 adjacent to the third image P3 may be changed to the design change image P2-2. In this case, in addition to the first image P2, the second image P2, and the third image P3, the design change image P2-2 (hereinafter, referred to as the fourth image P2-2 in the present embodiment) as the fourth image. It will be equipped.

In this case, when the observation direction is changed to one direction, the first image P1, the second image P2, the fourth image P2-2, and the third image P3 are switched in this order, as shown in FIG.
The colors of the character background portions of the first image P1 and the second image P2 are different, but the colors of the character background portion of the second image P2 and the fourth image P2-2 are the same. Further, the color of the character background portion between the fourth image P2-2 and the third image P3 is different. Therefore, the color of the character background portion changes when the first image P1 and the second image P2 are switched and when the fourth image P2-2 and the third image P3 are switched, but the second image P2 and the fourth image P2 are changed. The color of the character part background part does not change at the time of switching to -2. On the other hand, the character colors of the first image and the second image are the same, and the character colors of the fourth image P2-2 and the third image are the same. The colors of the characters of the second image P2 and the fourth image P2-2 are different. Therefore, the character color does not change when the first image P1 and the second image P2 are switched and when the fourth image P2-2 and the third image P3 are switched, but the second image P2 and the fourth image P2-2 are not changed. When switching between and, the color of the text changes.

Therefore, in the process of switching the image from the first image P1 to the third image P3 through the second image P2 and the fourth image P2-2, the color of the character background portion is switched from the first image P1 to the second image P2. Time, and changes twice when switching from the fourth image P2-2 to the third image P3. On the other hand, the color of the character changes once when switching between the second image P3 and the fourth image P2-2. That is, in the process of switching from the first image P1 to the second image P2 and the third image P3, the color of the character and the color of the character background portion change, but depending on the number of times the color of the character background portion changes. However, the number of changes in the color of letters is small. Specifically, the color of the character background changes twice, whereas the color of the character changes once.

The character colors of the second image P2 and the fourth image P2-2 are different, but the character background portion is the same color. Therefore, when the image changes between the second image P2 and the design change image P2-2, the color of the character background portion does not change, and only the color of the character changes. In this way, the timing of changing the color of the character background portion and the timing of changing the color of the character may be deviated.

"Modification"
In the third embodiment, the fourth image P4 shown in FIG. 14 may be used instead of the fourth image P2-2. The fourth image P4 illustrated in FIG. 14 includes a fourth background image P41 including a fourth character background portion B4 that is grayer than the gray character background portion of the second image P2, and darker than the gray character background portion B4. This is an image in which the character background portion B4 and the fourth character image P42 of the character C4 of “OPERAPATH” displayed in a dark gray that can be identified are superimposed.

In this case, when the observation direction is changed to one direction, as shown in FIG. 15, the image is switched from the first image P1 to the second image P2, the fourth image P4, and the third image P3. The colors of the character background portions of the first image P1, the second image P2, the fourth image P4, and the third image P3 are different. Therefore, when the four images from the first image P1 to the third image P3 are switched, the color of the character background portion changes for each image. On the other hand, in the first image P1 and the second image P2, the characters have the same color and the same color, and therefore do not change when switching from the first image P1 to the second image P2. Since the second image P2 and the fourth image P4 and the fourth image P4 and the third image P3 have different character colors, when the images of the second image P2 and the fourth image P4 are switched, When the images of the image P4 and the third image P3 are switched, the color of the character changes. That is, in the process of switching from the first image P1 to the third image P3, the color of the character and the color of the character background part change respectively, but the color of the character is more than the number of times the color of the character background part changes. The number of changes is small. Specifically, the color of the character background changes three times, while the color of the character changes twice.

Also in this example, as in the first embodiment, the color of the character background portion is changed according to the observation direction, and the character is changed in color while ensuring good visibility of the character regardless of the observation direction. be able to. Further, by changing the color of the character background portion and the color of the character according to the viewing direction, it is possible to expect the effect of increasing the interestingness of the visual effect.

In addition, in this example, since the background image includes an image in which the density changes in four steps, the background image changes more gently than in the case where the background image density changes in three steps when the image is switched. And can make more natural changes.

The image display body of the present disclosure includes a picture and a mark, and is suitable for a business card, a postcard, a poster, or the like, which wants to clearly display the mark regardless of where it is viewed.

The disclosure of Japanese Patent Application No. 2019-019922 filed on Feb. 6, 2019 is incorporated herein by reference in its entirety.
All publications, patent applications, and technical standards mentioned herein are to the same extent as if each individual publication, patent application, and technical standard were specifically and individually noted to be incorporated by reference, Incorporated herein by reference.

Claims

A plurality of cylindrical lenses having a convex shape are arranged, and a lenticular lens sheet having a flat surface on the side opposite to the convex shape,
An image forming layer which is provided on the flat surface side and has at least three images of a first image, a second image and a third image, each of the first image, the second image and the third image An image forming layer composed of a plurality of divided images divided into strips,
An image display body that switches in order of the first image, the second image, and the third image when the observation direction observed through the lenticular lens sheet changes,
In each of the first image, the second image, and the third image, the same mark arranged in the same position and in the same size is inserted, and the mark of the mark is inserted. The color is identifiable with respect to the color of the mark background, which is the background of the mark,
In the process of switching from the first image to the third image, the color of the mark background part and the color of the mark change, and the number of times the color of the mark background part changes An image display that changes the color of the mark less often.
The image display according to claim 1, wherein the color of the background of the mark changes twice and the color of the mark changes once in the process of switching from the first image to the third image.
The image display according to claim 1 or 2, wherein the color of the mark of the second image is the same as the color of the mark of the first image or the color of the mark of the third image.
The color of the mark background portion of each of the first image, the second image, and the third image changes stepwise between the first image, the second image, and the third image. The image display according to any one of claims 1 to 3, wherein
The first image, the second image and the third image are monochrome images,
The first image and the third image are images whose shades are reversed from each other, and the color of the mark background portion of the second image is the same as the density of the mark background portion of the first image and the color of the second image. The image display according to claim 4, which is an intermediate color having an intermediate density with that of the background portion of the mark.
In the first image, the color of the mark background portion is white, and the color of the mark is black,
In the third image, the color of the mark background portion is black, and the color of the mark is white,
The image display according to claim 5, wherein in the second image, the color of the mark background portion is gray and the color of the mark is black or white.
In the image forming layer, at least one divided image of each of the first image, the second image, and the third image is arranged in a unit area corresponding to one of the cylindrical lenses. The image display according to any one of claims 1 to 6.
The image display body according to claim 7, wherein a plurality of the divided images of the first image, the second image, and the third image are continuously arranged in the unit area.
The image display according to any one of claims 1 to 8, wherein the first image, the second image, and the third image are different only in color.
The image forming layer has a fourth image in addition to the first image, the second image and the third image, and the fourth image also includes three images of the first image to the third image. The same mark placed in the same size corresponding to each is placed in the same size,
The color of the mark of the fourth image is the same as the color of the mark of the second image or the color of the mark of the third image,
When the observation direction for observing the image forming layer through the lenticular lens sheet changes, the first image, the second image, the fourth image, and the third image are switched in this order,
In the process of switching from the first image to the third image through the second image and the fourth image, the number of times that the color of the mark background portion changes is two. The color of the chapter changes once, or the color of the background of the mark changes three times, whereas the color of the mark changes once or twice. The image display according to any one of claims 1 to 9.