JP2014059417A - Optical film and display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical film allowing a new decoration to exhibit an illusion as if a structure exists in the inside of a vessel, such as a bottle and a cup by sticking one sheet of film to the vessel in a cylindrical shape or a part of a cylindrical shape and being simply manufactured.SOLUTION: The optical film has a transparent oriented film stuck on a part of the inner side surface of a polarizer having a cylindrical shape or a part of cylindrical shape. The transparent oriented film used here is preferably a 1/2 wavelength plate, and the oriented direction preferably forms an angle of 44 degrees to 46 degrees to a transmission axis or an absorption axis of the polarizer to be stuck.

Description

  The present invention relates to an optical film and a display device. The optical film of the present invention can be preferably used as a decorative label in a transparent container or the like.

A toy called a black wall is known as a structure that uses a polarizing plate to show a black wall that is not actually present (that is, the black wall is a virtual image). This is because the two polarizing plates are made into a cylindrical shape or the like, and the end surfaces are brought into contact with each other so that the absorption axes of the two polarizing plates are orthogonal to each other, as if a black wall is formed on the contact surface. It is something to show.
As an example of such a structure, for example, Patent Document 1 discloses a technique for forming a virtual image inside a cylindrical structure. Patent Document 2 discloses a technique relating to virtual image formation using a polarizing plate.
Patent Document 3 describes an example in which an optical film and a polarizing plate are combined and applied to an authentication element such as a credit card. However, in this example, the optical film is affixed in a planar shape and is not disposed in a cylindrical shape, and does not include a stereoscopic element.

Japanese Patent No. 3085656 JP 2006-37707 A Special table 2001-525080 gazette

  As described above, it was possible to generate an image by an illusion by using two polarizing plates and making their transmission axes orthogonal to each other and joining the ends. However, it is difficult to attach the two polarizing plates without gaps, and the shape of the image that can be generated is limited, so that the application of this type of technology has been limited to toys and the like so far.

  The present invention has been made in view of the above situation, and it is an object of the present invention to provide means for forming an image based on a stereoscopic illusion with a single film and to propose a new method of decoration.

  In order to apply the illusion phenomenon to containers such as bottles and cups, the inventor has intensively studied a technique for generating an illusion of a shape having a large degree of freedom with a single film. As a result, by attaching a half-wave plate to the polarizing plate, it is possible to generate a stereoscopic image by optical illusion with one film, and to change the shape of the half-wave plate in various ways. And found that images of various shapes can be easily generated. The present invention has been made based on such examination results, and more specifically is as follows.

  (1) The present invention is an optical film characterized in that a polarizing plate has a cylindrical shape or a partial shape of a cylindrical shape, and a transparent stretched film is pasted on a part of an inner surface of the polarizing plate.

  (2) Moreover, this invention is an optical film as described in said (1) characterized by the said transparent stretched film being a half-wave plate.

  (3) The present invention is also characterized in that the direction of the stretching axis of the transparent stretched film to be attached is an angle of 43 to 47 degrees with respect to the transmission axis or absorption axis of the polarizing plate ( The optical film according to item 1) or (2).

  (4) Moreover, this invention makes a polarizing plate a cylindrical shape or the shape of a part of cylindrical shape, and arrange | positions the liquid crystal element which can be bent along the inner surface of the said polarizing plate to at least one part of the inner surface of the said polarizing plate. This is a display device characterized by the above.

  According to the present invention, by attaching a single optical film to a container such as a bottle or a cup, an image can be generated by an illusion phenomenon, and a new industrially possible decoration method is provided.

1 is a plan view showing the configuration of the optical film of the present invention in Example 1. FIG. FIG. 2 is a perspective view schematically showing how a virtual image appears when the optical film shown in FIG. 1 is formed into a cylindrical shape. FIG. 3 is a photograph when the optical film in Example 1 is attached to a bottle. 4 is a plan view showing the configuration of the optical film of the present invention in Example 2. FIG. FIG. 5 is a side view schematically showing how a virtual image appears when the optical film shown in FIG. 4 is formed into a cylindrical shape. FIG. 6 is a photograph when the optical film in Example 2 is attached to a bottle. FIG. 7 is a photograph when the contents (pencil) are contained in the bottle of FIG.

  Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a plan view showing the configuration of the optical film of the present invention in Example 1 described later. FIG. 2 is a perspective view schematically showing how a virtual image appears when the optical film shown in FIG. 1 is formed into a cylindrical shape.

The optical film of the present invention can be used as a label for containers such as bottles, cups and glasses.
For example, consider the case of using the optical film of the present invention as a bottle label. The optical film shown in FIG. 1 is an example of the present invention, and is indicated by reference numeral 103 that forms an angle of about 45 degrees with the transmission axis on the surface of the polarizing plate 100 having the transmission axis in the direction indicated by reference numeral 102 in FIG. A transparent stretched film 101 having a stretching axis in the direction is attached. It is preferable to use a transparent stretched film that functions as a half-wave plate. In the following description, an example in which a half-wave plate is used as the transparent stretched film will be described. When the optical film thus obtained is applied around the bottle so that the half-wave plate is on the inside, as shown in FIG. 2, black or dark blue standing in a substantially vertical direction inside the bottle. A mysterious impression that there is a color structure can be inspired. By changing the shape of the half-wave plate, it becomes possible to form optical illusions of structures of various shapes. At this time, the distance from the outer frame of the image formed by the illusion is changed by changing the width of the half-wave plate. This makes it possible to form images of various shapes. Moreover, it is preferable that the transparent stretched film of this invention is affixed substantially symmetrically.

  In the optical film of the present invention, for example, as shown in FIG. 1, the optical film has a structure in which a half-wave plate 101 is attached to the surface of the polarizing plate 100. And a region where the half-wave plate 101 exists on the surface of the polarizing plate 100. From another point of view, the area indicated by reference numeral 100 is an area of only the polarizing plate, and the area indicated by reference numeral 101 is an area where a half-wave plate is attached to the surface of the polarizing plate. Therefore, in the cylindrical structure in which the surface to which the half-wave plate is affixed is made inward and the cylinder is formed, the light coming from the other side of the cylindrical structure as viewed from the observer is (1) Pass through the region of the polarizing plate only twice, (2) pass through both the region of the polarizing plate only and the region where the half-wave plate is attached, and (3) half the wavelength of the polarizing plate. It passes through the cylindrical structure in one of three patterns: passing through the region where the plate is attached twice. The light transmission behavior will be described for each of these patterns.

  (1) Light that passes through the region of the polarizing plate only twice, that is, only through the region of the polarizing plate without the half-wave plate attached, passes through the tube. That is, light that passes through the cylindrical structure through the cylindrical structure only twice without passing through the part where the transparent stretched film such as a half-wave plate is pasted, passes through the cylindrical structure to the viewer side. Comes out of the cylindrical structure. However, since 50% of the incident light is absorbed by the polarizing plate that passes first, the amount of light that appears on the viewer side is 50% or less. For this reason, it looks darker than when no film is attached.

  (2) Light that passes through both the region of the polarizing plate alone and the region where the half-wave plate is affixed does not pass through the tube. When light enters the cylindrical structure from the side of the polarizing plate to which the half-wave plate is affixed, the light that has passed through the polarizing plate passes through the half-wave plate. The oscillation direction of polarized light rotates symmetrically with respect to the extending direction of the half-wave plate. At this time, when the extending direction of the half-wave plate is at an angle of 45 degrees with respect to the transmission axis or absorption axis of the polarizing plate, the polarized light rotates 90 degrees when passing through the half-wave plate. . The rotated polarized light is almost absorbed by the polarizing plate and does not escape to the observer side when it passes through the region of the polarizing plate only. For this reason, this part appears colored black or blue. The above explanation is for the case where light passes through the area of the polarizing plate only after passing through the polarizing plate to which the half-wave plate is attached, but the same phenomenon occurs when the light passes in the reverse order. Occur.

  (3) Light that passes twice through the portion where the half-wave plate is attached to the polarizing plate passes through the cylindrical structure. When the polarized light that has passed through the incident-side polarizing plate passes through the half-wave plate attached to the inner surface of the polarizing plate, as described above, the transmission axis of the polarizing plate and the half-wave plate When the stretching direction is 45 degrees, the vibration direction of polarized light rotates 90 degrees. The polarized light rotated by 90 degrees moves inside the cylinder and reaches the half-wave plate attached to the polarizing plate on the observer side. Since the extending direction of the half-wave plate is folded with respect to the incident side, it is orthogonal to the extending direction of the incident half-wave plate. For this reason, when the polarized light rotated 90 degrees by the incident-side half-wave plate passes through the half-wave plate attached to the observer-side polarizing plate, the vibration direction is the first half. Return to the state before passing through the one-wave plate. For this reason, it comes out without being absorbed by the polarizing plate on the viewer side.

  When a half-wave plate is attached to a part of the cylindrical polarizing plate, the area where the half-wave plate is attached and the area where the half-wave plate is not attached are always adjacent, The light that passes only through the region of the light beam appears bright because it passes through the cylindrical structure, while the light that passes through the region where the half-wave plate is attached and the region where the light is not attached passes through. It looks dark because it does not come. As a result, it appears that there is a black or colored wall at the boundary between the area where the half-wave plate is affixed and the area where it is not. At this time, an illusion is given to the observer as if a three-dimensional object exists inside the cylindrical structure. In addition, the image by the illusion appears to be floating in space and has aesthetic value.

  The effect of a stretched film, particularly a half-wave plate, when such a polarizing plate is formed into a cylindrical shape was not expected from the beginning, and the present inventor has studied the illusion phenomenon using a polarizing plate for many years. Among them, it was discovered unexpectedly while conducting an experiment to examine the effect of putting a stretched film inside a cylindrical polarizing plate, and it is a phenomenon that has never been seen so far.

  As described in Patent Document 1 described above, the end faces of two polarizing plates whose transmission axes are orthogonal to each other are also bonded together without any gap, but the shapes that can be taken are very limited. According to this method, the shape of the half-wave plate to be attached can be freely set, so that an image with an illusion of an arbitrary shape can be easily formed. This became the first industrially available method.

When the angle formed by the transmission axis of the polarizing plate and the stretching axis of the half-wave plate is not 45 degrees, the transmission axis on the observer side does not coincide with the vibration direction of the polarized light, so that it is not colorless and transparent. In this case, specific coloring depending on the angle formed by the transmission axis of the polarizing plate and the stretching axis of the half-wave plate occurs. At this time, the portion (2) is not black or blue, and coloring depending on the angle occurs. In such a case, a unique aesthetic impression can be brought about by changing the color tone. The angle formed by the transmission axis of the polarizing plate and the stretching axis of the half-wave plate is preferably 43 ° to 47 °, and more preferably 44 ° to 46 °.
Further, even when the stretched film is not a half-wave plate, the regions (2) and (3) are colored depending on the retardation of the stretched film, which may give a unique aesthetic feeling.

  The present invention is particularly suitable for labeling clear bottles for clear liquids. Specifically, the use for bottles such as sake, shochu, gin, vodka and whiskey is particularly suitable. By using them as labels for these beverages, it is possible to give an illusion that a three-dimensional structure is contained in the beverage, and it is possible to give a special impression to consumers. Moreover, you may use for the decoration of containers, such as a transparent cup.

  In addition, characters, symbols, patterns, and the like can be displayed on the surface of these illusionary virtual boards. Two methods can be used to display characters and patterns. One method is a method of cutting out a part of a half-wave plate affixed on a polarizing plate into a letter or pattern shape. By doing so, it becomes possible to display characters and patterns in white (transparent) on a structure with an illusion colored in black or blue.

  The second method is a method of sticking a second stretched film in the shape of letters or patterns on a half-wave plate. By adjusting the retardation or stretching direction of the second stretched film, it becomes possible to give a color tone. That is, according to this method, not only a single color display but also a color display becomes possible.

  A display device in which the polarizing plate has a cylindrical shape or a part of a cylindrical shape, and a liquid crystal element that can be bent along the inner side surface of the polarizing plate is disposed on at least a part of the inner side surface of the polarizing plate. one of. This display device uses a liquid crystal element instead of the transparent stretched film in the optical film already described. The liquid crystal element can rotate the plane of polarization of light similarly to the transparent stretched film described above, and can electrically control the degree of rotation of the plane of polarization. Therefore, by using a display device using a liquid crystal element instead of the above-described transparent stretched film, information or the like can be displayed with a virtual image generated arbitrarily.

  Examples of the present invention will be described below, but the scope of the present invention is not limited to these examples.

[Example 1]
1 is a plan view showing the configuration of the optical film of the present invention in Example 1. FIG. In Example 1, an optical film in which a half-wave plate 101 having a half length of the polarizing plate 100 is attached to the surface of the central portion in the length direction of the polarizing plate 100 is used. In other words, the area indicated by reference numeral 100 is an area where a half-wave plate is not attached, and the area indicated by reference numeral 101 is an area where a half-wave plate is attached. When the half-wave plate 101 is attached to the surface of the polarizing plate 100, the transmission axis of the polarizing plate represented by the arrow 102 and the stretching direction of the half-wave plate represented by the arrow 103 The angle formed by the axis of was made 45 degrees. FIG. 2 is a perspective view schematically showing how a virtual image appears when the optical film shown in FIG. 1 is formed into a cylindrical shape. When the optical film shown in FIG. 1 is cylindrical as shown in FIG. 2, the optical film shown in FIG. 1 may be simply rolled so that the half-wave plate 101 is on the inner surface side, Alternatively, a paste layer may be provided on the surface of the optical film on which the half-wave plate 101 is attached, and attached to a cylindrical structure such as a bottle. In FIG. 2, an arrow 117 represents a region where the half-wave plate is not attached, and corresponds to a region represented by reference numeral 100 in FIG. 1. An arrow 118 is an area where the half-wave plate is affixed, and corresponds to the area denoted by reference numeral 101 in FIG. The half-wave plate is on the inner surface side of the cylindrical structure.

  In the region denoted by reference numeral 110, the light that enters the cylindrical structure facing the viewer moves as a polarized light that vibrates in the vertical direction when passing through the polarizing plate. Since the transmission axis of the polarizing plate on the viewer side is vertical and parallel to the vibration direction of this polarized light, the polarized light that has passed through the structure passes through the polarizing plate on the viewer side. For this reason, the observer observes the region 110 as transparent.

  In the region denoted by reference numeral 112, similarly to the region denoted by reference numeral 110, the light entering the cylindrical structure facing the viewer is polarized on the opposite side of the viewer. The transmission direction of polarized light inside the structure is in the vertical direction. And when this polarized light passes through the half-wave plate affixed to the inside of the polarizing plate on the observer side (the inner surface side of the cylindrical structure), the vibration direction of the polarized light and the stretching of the half-wave plate Since the direction forms an angle of about 45 degrees, the polarized light that vibrates in the vertical direction when passing through the half-wave plate is rotated by 90 degrees to become the polarized light that vibrates in the horizontal direction. For this reason, this polarized light is absorbed by the polarizing plate on the viewer side. As a result, the region denoted by reference numeral 112 is observed as black or blue.

  In the region denoted by reference numeral 111, the light that enters the cylindrical structure facing the observer becomes polarized light that passes through the polarizing plate located on the opposite side of the observer and vibrates in the vertical direction. When passing through a half-wave plate affixed to the polarizing plate, the direction of vibration is rotated by 90 degrees to become polarized light that vibrates in the lateral direction, and moves inside the cylindrical structure. Then, this polarized light becomes a polarized light that rotates 90 degrees and vibrates in the vertical direction when passing through a half-wave plate attached to the inner surface of the viewer-side polarizing plate. to go into. Since the polarization vibration direction and the transmission axis direction of the polarizing plate are parallel to each other, the polarized light passes through without being absorbed. As a result, the area represented by reference numeral 111 is observed as transparent as the area represented by reference numeral 110.

  With the above mechanism, an illusion is given to the observer as if there is a plate-like object in the region indicated by reference numeral 112 in the interior of the cylindrical structure. Note that light that passes through the regions denoted by reference numerals 113, 114, 115, and 116 passes through the polarizing plate only once and is therefore observed transparently. For this reason, the plate-like object in the region denoted by reference numeral 112 is observed as a plate with a part missing. In reality, however, I don't really care about the lack of the upper and lower parts.

  Due to such a mechanism, it seems to the observer that a black or blue plate exists in the cylinder. When this cylindrical optical film is affixed to the surface of a transparent container such as a bottle, as shown in FIG. 3, it appears to the observer that a black or blue thin plate is present in the container. In FIG. 3, a part of the generated virtual image appears distorted due to the distortion of the glass container. When a transparent liquid is contained in the container, it appears as if a black or blue plate is present in the transparent liquid, creating a mysterious impression. This is mysterious as well as fresh and gives the observer a fresh surprise.

[Example 2]
4 is a plan view showing the configuration of the optical film of the present invention in Example 2. FIG. In Example 2, on the surface of the rectangular polarizing plate 120, the length of the base is the same as the length of the side of the rectangle in the length direction, and the height is the same as the length of the side of the rectangle in the width direction. An optical film is used in which a half-wave plate 122 having a certain triangular shape is attached so that the base of the triangle and one side in the length direction of the rectangle overlap. In other words, the area indicated by reference numeral 120 is an area where a half-wave plate is not attached, and the area indicated by reference numeral 122 is an area where a half-wave plate is attached. When the half-wave plate 122 is attached to the surface of the polarizing plate 120, the transmission axis of the polarizing plate represented by the arrow 121 and the axis in the extending direction of the half-wave plate represented by the arrow 123 are The angle made is 45 degrees. FIG. 5 is a side view schematically showing how a virtual image appears when the optical film shown in FIG. 4 is formed into a cylindrical shape. When the optical film shown in FIG. 4 is formed into a cylindrical shape, the optical film shown in FIG. 4 may be simply rolled so that the half-wave plate 122 is on the inner surface side. A paste layer may be provided on the surface of the surface on which the half-wave plate 122 is affixed, and affixed to a cylindrical structure such as a bottle.

  The region denoted by reference numeral 130 is a portion where incident light passes only through the region where the half-wave plate is not attached. That is, it is a portion where incident light passes only through a region denoted by reference numeral 121 in FIG. The region denoted by reference numeral 131 enters from the region where the half-wave plate is not affixed (region denoted by symbol 120), and the region where the half-wave plate is affixed (reference symbol 122). Or the incident light enters the area where the half-wave plate is pasted (the area represented by reference numeral 122) and the half-wave plate is pasted. This is a portion that reaches the observer side through a non-exposed region (region represented by reference numeral 120). The area denoted by reference numeral 132 enters from the area where the half-wave plate is attached (area indicated by reference numeral 122), and the area where the half-wave plate is attached again (reference numeral 122). This is the part that reaches the observer side through the area.

  In the region denoted by reference numeral 130, the light that enters the cylindrical structure facing the observer becomes polarized light that vibrates in the vertical direction when passing through the polarizing plate (region denoted by reference numeral 121). Move inside the structure. Since the transmission axis of the polarizing plate on the viewer side (region denoted by reference numeral 121) is vertical and parallel to the vibration direction of this polarized light, the polarized light that has passed through the structure is polarized on the viewer side ( The region denoted by reference numeral 121). For this reason, the observer observes the region represented by reference numeral 130 as being transparent.

  In the region denoted by reference numeral 131, similarly to the region denoted by reference numeral 130, the light entering the cylindrical structure facing the viewer is polarized on the opposite side of the viewer. As the light passes through (the region denoted by reference numeral 121), the vibration direction of polarized light inside the structure is in the vertical direction. Then, when this polarized light passes through a half-wave plate (region denoted by reference numeral 122) attached to the inside of the polarizing plate on the observer side (inner surface side of the cylindrical structure), the vibration direction of the polarized light And the extending direction of the half-wave plate form an angle of about 45 degrees, so that the polarized light that vibrates in the vertical direction rotates 90 degrees and vibrates in the lateral direction when passing through the half-wave plate. It becomes polarized light. For this reason, this polarized light is absorbed by the polarizing plate (region denoted by reference numeral 122) on the observer side. As a result, the region denoted by reference numeral 131 is observed as black or blue. Depending on the angle, incident light may enter from the region represented by reference numeral 122 and come out from the region represented by reference numeral 121, but is similarly observed in black or blue.

  In the region denoted by reference numeral 132, the light entering the cylindrical structure facing the observer passes through a polarizing plate (region denoted by reference numeral 122) located on the opposite side of the observer. It becomes polarized light that vibrates in the vertical direction, and further, when it passes through a half-wave plate attached to the polarizing plate, the vibration direction rotates 90 degrees and becomes polarized light that vibrates in the horizontal direction. Move inside. Then, this polarized light becomes a polarized light that rotates 90 degrees and vibrates in the vertical direction when passing through a half-wave plate attached to the inner surface of the viewer-side polarizing plate. (Region represented by reference numeral 122). Since the polarization vibration direction and the transmission axis direction of the polarizing plate are parallel to each other, the polarized light is transmitted without being absorbed.

  As a result, the image seen with the optical illusion of this embodiment looks like “leaves”. When this cylindrical film is pasted on the surface of a transparent container, it appears that there are blue “leaves” in the container as shown in the photograph in FIG. Further, when the contents are contained in the container, the contents appear to penetrate through a virtual image of a leaf existing in the container as shown in the photograph in FIG. Furthermore, a portion of the pasted half-wave plate can be cut into a thin strip shape to express a “leaf” streak.

  On the other hand, in order to generate a virtual image as in the present invention without depending on the present invention, it is necessary to accurately bond two polarizing plates whose transmission axes are orthogonal to each other, and a shape that can be realized by such a method. Is limited. Therefore, such a method using two polarizing plates is limited to a very limited application such as a toy or an object for scientific enlightenment. In particular, when a label or the like is produced by such a method, it is not suitable as an industrial method because it is necessary to attach two polarizing plates having different polarization directions accurately without causing a gap. Furthermore, the shape that can be realized by this method is limited to an extremely simple shape.

DESCRIPTION OF SYMBOLS 100 Polarizing plate 101 Half-wave plate 102 Direction of transmission axis of polarizing plate 103 Stretching direction of half-wave plate 110 Incident light from the opposite direction to the observer passes through the polarizing plate twice and is on the viewer side The region where the incident light reaches 111 The region where the incident light passes through the polarizing plate with the half-wave plate affixed inside twice and reaches the observer side 112 The incident light that passes through the polarizing plate once and is attached to the polarizing plate 2 minutes The region where the incident light passes through the polarizing plate once and reaches the viewer side 113 The incident light passes through the polarizing plate once and reaches the viewer side 114 The incident light passes through the polarizing plate once, A region that passes through the half-wave plate once and reaches the observer side 115 A region where incident light passes through the half-wave plate once and reaches a viewer side after passing through the polarizing plate once 116 An incident light reaches 1 A region passing through the circularly polarizing plate and reaching the viewer side 117 A region including only the polarizing plate 118 A polarizing plate Area where half-wave plate is affixed on the inside 120 Polarizing plate 121 Direction of transmission axis of polarizing plate 122 Half-wave plate 123 Stretching direction of half-wave plate 130 Incident light is only polarizing plate A region that is transmitted twice through the region 131 A region in which incident light is transmitted through the polarizing plate after passing through the polarizing plate, and a region in which the incident light is transmitted through the polarizing plate 132 Region that is transmitted through the polarizing plate

Claims (4)

  An optical film comprising a polarizing plate having a cylindrical shape or a partial shape of a cylindrical shape, and a transparent stretched film attached to a part of an inner surface of the polarizing plate.   2. The optical film according to claim 1, wherein the transparent stretched film is a half-wave plate.   The optical film according to claim 1 or 2, wherein the direction of the stretched axis of the transparent stretched film to be attached forms an angle of 43 to 47 degrees with respect to the transmission axis or absorption axis of the polarizing plate.   A display characterized in that the polarizing plate has a cylindrical shape or a part of a cylindrical shape, and a liquid crystal element that can be bent along the inner side surface of the polarizing plate is disposed on at least a part of the inner side surface of the polarizing plate. apparatus.