JP4637758B2 - Peep prevention body - Google Patents

Description

  The present invention relates to a peep prevention body that is applied to, for example, a display screen of a mobile phone, a portable information terminal, etc., and prevents peeping of contents displayed on the display screen.

For example, as a peep prevention body applied to a display screen of a mobile phone, a portable information terminal, etc., in the following Patent Document 1, a plurality of transparent silicone rubber sheets and colored silicone rubber sheets are alternately arranged and integrated to form a louver layer. And a light-transmitting layer provided on the surface of the louver layer and an adhesive layer provided on the back surface of the louver layer have been proposed.
According to the peep prevention body having such a configuration, peeping from the side can be prevented without impairing the visibility of the display screen from the user.
JP 2003-131202 A

  However, the peep prevention body as described above is used by adhering to a display screen of a mobile phone, for example. However, it merely prevents peeping from the side, and there is little visual change. It is not interesting as an accessory.

  The present invention has been made in order to solve the above-described problems, and while ensuring the visibility of the display screen, it can prevent peeping from the side and has a decorative look. The object is to provide an anti-viewing body.

In order to achieve the above object, the peeping prevention body of the present invention is a peeping prevention body used by being bonded to a display screen, and a louver layer in which light transmission bands and light shielding bands are alternately arranged. When provided with a transparent resin layer provided on the viewing side of the louver layer, between the transparent resin layer and the louver layer, it has a decorative layer which is colored by a dye,
In the peep prevention body, the thickness direction of the louver layer is the Z direction, the light transmittance when light is transmitted in the Z direction in the region where the decorative layer exists is C%, and the region where the decorative layer does not exist When the light transmittance when transmitting light in the Z direction is D% and the light transmittance of only the decorative layer is a value obtained by (C / D) × 100 (unit:%), the decoration The light transmittance (D) of the region where no layer is present is 60% or more, the light transmittance (C) of the region where the decorative layer is present is 50% or more, and the light transmittance of only the decorative layer is The rate is 65 to 90% in 90% or more of the total area of the decorative layer, and the display screen and the pattern formed by the decorative layer can be simultaneously recognized.

  ADVANTAGE OF THE INVENTION According to this invention, while ensuring the visibility of a display screen, while being able to prevent a peep from a side, the peep prevention body provided also with the decoration property is obtained.

FIG. 1 is an exploded perspective view showing an embodiment of the peep prevention body of the present invention in an exploded manner. The drawing schematically shows an enlarged part of the peep prevention body.
The peep prevention body 1 of the present embodiment is decorated on a surface (hereinafter also referred to as a surface) on the viewing side of the louver layer 10 in which the light transmission bands 11 and the light shielding bands 12 are alternately arranged. The transparent resin layer 13 is laminated and integrated with the layer 20 in between, and the adhesive layer 14 is laminated and integrated on a surface opposite to the viewing side (hereinafter also referred to as a back surface).
Hereinafter, the thickness direction of the louver layer 10 is defined as a Z direction, and two directions perpendicular to each other in a plane perpendicular to the Z direction are defined as an X direction and a Y direction, respectively.
The overall planar shape of the peeping prevention body 1 in the XY plane (a plane perpendicular to the Z direction) is, for example, a rectangle, but can be appropriately changed according to the shape of the display screen to be applied.

[Louvre layer]
The light transmission band 11 and the light shielding band 12 constituting the louver layer 10 are both strips extending in the X direction, and a plurality of light transmission bands 11 and a plurality of light shielding bands 12 are alternately arranged in the Y direction. . The widths of the plurality of light transmission bands 11 in the Y direction are uniform and constant in the X direction. The widths of the plurality of light shielding bands 12 in the Y direction are also uniform and constant in the X direction.

As the material of the light transmission band 11, a highly transparent resin is used. Specifically, a resin having high transparency such that the light transmittance when light is transmitted in the Z direction in the figure with respect to only the light transmission band 11 is 75% or more, preferably 85% or more. Material is preferred. For example, highly transparent thermoplastic resins and thermosetting resins are used. Specific examples include cellulose resins, polyolefin resins, polyester resins, silicone resins, polystyrene resins, polyvinyl chloride resins, acrylic resins, polycarbonates. Examples thereof include resins. Of these, silicone resins are preferred, and silicone rubber is particularly preferred from the viewpoint of heat resistance.
Note that the value of “light transmittance” in this specification is D ₆₅ defined in JIS Z 8720 as a light source, and in the apparatus for measuring the intensity of inspection light emitted from the light source with a light receiving sensor, the inspection light is used. The output value of the light receiving sensor when there is no object to be measured on the optical path is set to A, the object to be measured is set on the optical path of the inspection light, and the transmitted light transmitted through the object to be measured is received by the light receiving sensor. When the output value of B is B, the light transmittance = (B / A) × 100 (unit:%).

As the material of the light-shielding band 12, a colored resin obtained by using the above-described resin as the material of the light-transmitting band 11 as a base material and adding a colorant such as a pigment or a dye thereto is suitably used. The color tone of the light-shielding band 12 is not particularly limited as long as a preferable light-shielding property in the light-shielding band 12 can be obtained. The color tone of the shading band 12 can be adjusted by the type and amount of the colorant. Specifically, it is preferable that only the light-shielding band 12 has a light-shielding property so that the light transmittance when light is transmitted in the Y direction in the figure is 40% or less, preferably 10% or less. Moreover, since the color tone of the light-shielding band 12 constitutes the color tone recognized when the louver layer 10 is viewed, it is preferable to design the color tone in consideration of decorativeness.
Specific examples of the colorant include general organic pigments or inorganic pigments such as carbon black, benkara, iron oxide, titanium oxide, yellow iron oxide, disazo yellow, and phthalocyanine blue. One colorant may be used, or two or more colorants may be used. Moreover, when not using a black pigment, it is preferable to use a white pigment together in order to obtain favorable light-shielding property.
In the louver layer 10, the resin material forming the light transmission band 11 and the resin material as the base material of the light shielding band 12 may be the same or different. From the point of adhesiveness to 12, it is preferable that both are the same.

FIG. 2 is a cross-sectional view of the louver layer 10 taken along the YZ plane. In the louver layer 10, the viewing angle θ in the YZ plane (the paper surface in FIG. 2) is determined by the thickness of the light transmission band 11 in the Z direction and the width in the Y direction. Further, the ratio of the width of the light transmission band 11 to the width of the light shielding band 12 in the Y direction affects the transmittance of light rays parallel to the Z direction.
Specifically, the viewing angle θ in the louver layer 10 is preferably in the range of 30 to 150 °, more preferably 60 to 120 °.
The thickness T in the Z direction of the light transmission band 11 is preferably about 0.1 to 2.5 mm, and more preferably about 0.14 to 0.4 mm.
The width W1 in the Y direction of the light transmission band 11 is preferably in the range of 50 μm to 0.3 mm, and more preferably in the range of 75 μm to 0.2 mm.
The width W2 of the light shielding band 12 in the Y direction is preferably in the range of 5 μm to 50 μm, and more preferably in the range of 15 μm to 30 μm.
The thickness T of the light shielding band 12 in the Z direction is the same as the thickness T of the light transmission band 11.

  The louver layer 10 having such a configuration can be manufactured as follows. First, a plurality of sheets of the first sheet made of the constituent material of the light transmission band 11 and the thickness W1 and a plurality of sheets of the second sheet made of the constituent material of the light shielding band 12 and the thickness W2 Are alternately laminated, and heated and pressed to form a block body in which the plurality of sheets are integrated. Next, the louver layer 10 is obtained by slicing the block body along a cut surface perpendicular to the sheet surface. The thickness (slice width) when slicing is the above T.

[Decoration layer]
The decorative layer 20 is colored with a dye. The color tone of the decorative layer 20 is different from the color tone of the shading band 12 in the louver layer 10. The shape in the XY plane of the decoration layer 20 can be made into the shape of a desired picture.
Specifically, the decoration layer 20 can be formed by printing on the surface of the transparent resin layer 13 on the louver layer 10 side using a dye-based ink.
As the printing method, an ink jet method or a sublimation transfer method is suitable. The ink jet method is preferable in terms of printing speed, resolution, and clarity of outlines such as characters, and the sublimation transfer method is preferable in terms of obtaining smooth gradation.
As the dye-based ink, a commercially available dye-based ink can be used without particular limitation. When the decorative layer 20 is printed by the inkjet method, a commercially available inkjet dye-based ink can be used as appropriate. The aqueous dye type is preferred.
When the decorative layer 20 is printed by the sublimation transfer method, a commercially available dye-based ink for sublimation transfer can be appropriately used. A sublimable solid dye type is preferred.

The light transmittance in the decorative layer 20 varies depending on the type and amount of the dye present in the decorative layer 20.
The lower the light transmittance in the decorative layer 20, the better the visibility of the pattern formed by the decorative layer 20, but the lower the visibility of the screen when the peep prevention body 1 is applied on the display screen. To do.
Specifically, the light transmittance of only the decorative layer 20 is preferably in the range of 65 to 90% in 90% or more of the total area of the decorative layer 20, and is preferably 75 to 85%. More preferred.
By setting the light transmittance of the decorative layer 20 within the above range, good visibility of the display screen and good visibility of the pattern formed by the decorative layer 20 can be achieved at the same time.
In addition, the light transmittance need not be uniform throughout the decorative layer 20, and the light transmittance may be different depending on each part of the decorative layer 20. For example, a relatively low light transmittance is allowed in a region where the frequency of use is relatively low in the display screen, such as a peripheral portion of the display screen. On the other hand, it is preferable that the light transmittance of the decorative layer 20 is higher in a region where the usage frequency is high, such as the center of the display screen.
In addition, as a light transmittance of only the decoration layer 20, in the peep prevention body 1, the light transmittance when light is transmitted in the Z direction to the region where the decoration layer 20 exists is C%. When the light transmittance when light is transmitted in the Z direction to a region where the decorative layer 20 does not exist is D%, the light transmittance of only the decorative layer = (C / D) × 100 (unit:%) ) Is used.

[Transparent resin layer]
As the material of the transparent resin layer 13, a highly transparent resin is used. Specifically, a resin having a high transparency such that only the transparent resin layer 13 has a light transmittance of 75% or more, preferably 85% or more when light is transmitted in the Z direction in the figure. Material is preferred.
Moreover, it is preferable that the resin material which comprises the transparent resin layer 13 is highly transparent, and has a UV absorptivity, and specifically, a polyester-type resin, an acrylic resin, and a polycarbonate resin are preferable.
In particular, when the decorative layer 20 is printed by an inkjet method, it is preferable that the transparent resin layer 13 absorbs water and easily causes a phenomenon that the dye is fixed by volatilization of the water. It is preferable that an image receiving layer for absorbing water is provided on the surface.
Further, when printing the decorative layer 20 by the sublimation transfer method, it is preferable to use a polyester resin as the resin constituting the transparent resin layer 13 because printing can be directly performed on the transparent resin layer 13. Further, even if the resin constituting the transparent resin layer 13 is other than a polyester resin, a resin having good dyeability such as a vinyl chloride resin, a vinyl acetate resin, or a polyester resin on the surface on the decorative layer 20 side. Providing a coating layer made of a material makes it suitable for direct printing.

You may make the resin which comprises the transparent resin layer 13 contain an ultraviolet absorber. As the ultraviolet absorber, those which do not impair the transparency are preferable. Specific examples include cerium oxide ultraviolet absorbers, zinc oxide ultraviolet absorbers, and titanium oxide ultraviolet absorbers. These ultraviolet absorbers are preferably finely divided.
The particle diameter and addition amount of the ultraviolet absorber contained in the transparent resin layer 13 can be appropriately set within a range in which the preferable light transmittance of the transparent resin layer 13 is obtained.

  The thickness of the transparent resin layer 13 in the Z direction is preferably 0.025 mm or more, and more preferably 0.05 mm or more in terms of the protective function and the ultraviolet shielding effect. Moreover, since the light transmittance falls as the transparent resin layer 13 is thicker, 0.2 mm or less is preferable, and 0.1 mm or less is more preferable.

The method for laminating and integrating the louver layer 10, the decorative layer 20, and the transparent resin layer 13 is not particularly limited, and a known method can be used as appropriate.
For example, what prepared the printing of the decorating layer 20 on the single side | surface of the sheet | seat which consists of a material of the transparent resin layer 13 previously is prepared. And the adhesive was apply | coated on the surface in which the decoration layer 20 of the said sheet | seat (transparent resin layer 13) was formed, and / or the surface of the louver layer 10, and the decoration layer 20 was formed in the said sheet | seat. After bonding so that the surface is on the louver layer 10 side, the adhesive is cured.
The adhesive used at this time preferably has a high light transmittance after curing. Specifically, it is preferable that the light transmittance of the cured adhesive layer alone is 65% or more, and more preferably 80% or more.
Examples of such an adhesive include a thermosetting adhesive having a transparency after curing, a multi-component reaction adhesive, an ultraviolet curable adhesive, and the like. Specifically, an epoxy adhesive, a urethane adhesive, An acrylic adhesive, a melamine adhesive, a polyester adhesive, a silicone adhesive, and the like can be suitably used.

[Adhesive layer]
The material of the pressure-sensitive adhesive layer 14 may be any material as long as it has an adhesive force that can be removably bonded to the display screen, and a material having high transparency is preferable. Moreover, the thing with little adhesive residue when peeling from a display screen is preferable. For example, the pressure-sensitive adhesive layer 14 is a layer made of a material that is commercially available as a re-peelable pressure-sensitive adhesive, or a surface made of an elastomer (including a gel-like substance having a low cross-linking density) (surface bonded to the display screen). Preferably, the layer is Specific examples of the removable adhesive include acrylic adhesives, urethane adhesives, rubber adhesives, and the like. Specific examples of the elastomer include silicone rubber, silicone gel, urethane rubber, and urethane gel. Among these, silicone rubber is particularly preferable in that it has little adhesive residue and high transparency.

In the peep prevention body 1, the light transmittance in the region where the decorative layer 2 is not provided, that is, in the present embodiment, the portion where the adhesive layer 14, the louver layer 10, and the transparent resin layer 13 are laminated in the Z direction. The light transmittance when light is transmitted through is preferably 60% or more, and more preferably 70% or more. The upper limit of the light transmittance is preferably higher, but about 90% is the limit to achieve the peep prevention function.
Moreover, in the peep prevention body 1, the light transmittance of the area | region in which the decoration layer 20 is provided, ie, the transparent resin layer 13, the decoration layer 20, the louver layer 10, and the adhesion layer 14 is laminated | stacked in this embodiment. The light transmittance when light is transmitted through the portion in the Z direction is preferably 50% or more and more preferably 60% or more from the viewpoint of the effect of the present invention. The upper limit of the light transmittance is preferably about 85% in order to achieve the function as a peep prevention body.

The peep prevention body 1 of the present embodiment is used by being pasted on a display screen such as a mobile phone. In this embodiment, the outer surface 14a of the pressure-sensitive adhesive layer 14 is a surface having adhesiveness, and can be repeatedly attached and detached by bringing this surface into close contact with the display screen.
Since the peep prevention body 1 of the present embodiment includes the louver layer 10, it can prevent peeping from the side.
Moreover, since the pattern is formed by the decoration layer 20, the decorativeness is imparted and the added value as an accessory is improved.
The decorative layer 20 is colored with a dye. Therefore, compared with the case where it colors with a pigment, favorable color developability is obtained and the light transmittance in the decoration layer 20 can be made high.
Further, although the dye has inferior ultraviolet resistance properties as compared with the pigment, by providing the decorative layer 20 between the louver layer 10 and the transparent resin layer 13, it is possible to reduce ultraviolet rays reaching the decorative layer 20. . The higher the ultraviolet absorptivity of the transparent resin layer 13, the higher the effect of preventing color deterioration of the decorative layer 20 due to ultraviolet rays.
Moreover, since the decoration layer 20 can be easily formed by a printing method, multicolor printing is possible and there are abundant variations of patterns.

[Modification]
As a modification of the above embodiment, a second transparent resin layer (not shown) is provided between the back surface of the louver layer 10 and the adhesive layer 14 separately from the transparent resin layer 13 provided on the viewing side of the louver layer 10. May be provided. A preferable material, a preferable light transmittance range, a forming method, and the like of the second transparent resin layer can be the same as those of the transparent resin layer 13 on the viewing side.
According to such a modification, since the louver layer 10 is sandwiched between the transparent resin layer 13 on the viewing side and the second transparent resin layer, the symmetry of the structure is increased, and warpage is unlikely to occur. The structural stability is improved.

Examples are given below, but the present invention is not limited to these examples.
Example 1
A peep prevention body having the configuration shown in FIG. 1 was produced.
First, a first sheet made of transparent silicone rubber (trade name: KE153U, manufactured by Shin-Etsu Chemical Co., Ltd.) having a thickness of 200 μm was prepared as the light transmission band 11.
Separately, a second sheet made of a material obtained by adding 15 parts by mass of carbon black to 100 parts by mass of transparent silicone rubber (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: KE153U) as the light shielding band 12 is 20 μm in thickness. Prepared.
A plurality of first sheets and a plurality of second sheets were alternately laminated, heat vulcanized and pressurized to form a block body in which these sheets were integrated.
Next, the louver layer 10 was produced by slicing the block body to a thickness of 360 μm at a cut surface perpendicular to the sheet surface.

  Apart from this, as the transparent resin layer 13, an acrylic resin Technoloy S003 (product name, manufactured by Sumitomo Chemical Co., Ltd., thickness 0.125 mm) in which the surface on the decorative layer 20 side is coated with vinyl chloride resin was prepared. . The decorative layer 20 was printed on one surface of the polyester resin sheet by a sublimation transfer method.

Then, a thermosetting adhesive (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: KE1825) is printed on the printed surface (surface on which the decorative layer 20 is formed) of the polyester resin sheet (transparent resin layer 13) on which the decorative layer 20 is printed. ) And the printed surface was bonded onto one surface of the louver layer 10 obtained above, and the adhesive was thermally cured.
In addition, an adhesive layer 14 was formed on the other surface of the louver layer 10 by a screen printing method using a two-component curable silicone rubber (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: KE1935).
The viewing angle θ in the peep prevention body 1 obtained in this way was 120 °.
The light transmittance of the area | region (laminated part of the transparent resin layer 13, the louver layer 10, and the adhesion layer 14) in which the decorating layer 20 of this peep prevention body 1 is not provided was 80%.
Moreover, the light transmittance of the area | region (laminated part of the transparent resin layer 13, the decoration layer 20, the louver layer 10, and the adhesion layer 14) in which the decoration layer 2 was provided was 60%.

  The peep prevention body of the present invention is applied to an information display body display screen in, for example, a mobile phone, a portable information terminal (eg, PDA; Personal Digital Assistant), and prevents peeping of contents displayed on the display screen. it can.

1 is an exploded perspective view showing a first embodiment of the present invention. It is sectional drawing which shows the example of the louver layer concerning this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Peep prevention body 10 Louver layer 11 Light transmission band 12 Light-shielding band 13 Transparent resin layer 20 Decoration layer

Claims (1)

A peep prevention body that is used by adhering to a display screen,
Comprising a louver layer in which light transmission bands and light shielding bands are alternately arranged, and a transparent resin layer provided on the viewing side of the louver layer,
Between the transparent resin layer and the louver layer is colored by a dye, it has a decorative layer of the picture shape,
In the peep prevention body, the thickness direction of the louver layer is the Z direction, the light transmittance when light is transmitted in the Z direction in the region where the decorative layer exists is C%, and the region where the decorative layer does not exist When the light transmittance when transmitting light in the Z direction is D% and the light transmittance of only the decorative layer is a value obtained by (C / D) × 100 (unit:%), the decoration The light transmittance (D) of the region where no layer is present is 60% or more, the light transmittance (C) of the region where the decorative layer is present is 50% or more, and the light transmittance of only the decorative layer is The rate is 65 to 90% in 90% or more of the total area of the decorative layer, and the display screen and the pattern formed by the decorative layer can be viewed at the same time. body.

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