JP2007212507A - Peep prevention object - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a peep prevention object for preventing peep from right and left sides and an opposite side without damaging visibility from this side of a display screen. <P>SOLUTION: In the peep prevention object, a first louver layer 10 arranged alternately by a light transmission band 11 and a shading band 12 and a second louver layer 20 arranged alternately by a light transmission band 21 and a shading band 22 overlie in a thickness direction. The length direction of the shading band of the first louver layer 10 and the length direction of the shading band 22 of the second louver layer 20 are orthogonal, and the shading band 22 in the second louver layer 20 inclined to the surface of the second louver 20. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a peep prevention body that is applied to various display screens and prevents peeping of contents displayed on the display screen.

For example, as a peep prevention body applied to a display screen of an information display body composed of a mobile phone, a portable information terminal, a personal identification number input terminal such as a card, etc., a light transmission band 31 and a light shielding band 32 as shown in FIG. There is known one having a louver layer in which are alternately arranged (for example, Patent Document 1 below). 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.
In addition, in an automatic teller machine (hereinafter referred to as ATM) of a bank, in order to prevent a user from peeping from diagonally behind, as shown in FIG. There has also been proposed a structure in which two louver layers in which the light shielding bands 32 are alternately arranged are laminated so that the light shielding bands 32 of each layer cross each other obliquely.
JP 2003-131202 A

Recently, in a bank ATM, there has been a case where a camera for voyeurism is installed at a position in front of the user of the display screen, as shown by an arrow A in FIG. 5 in addition to the left and right sides of the display screen. There is an urgent need to prevent peeping from a direction opposite to the user of a simple display screen (hereinafter sometimes simply referred to as the opposite side).
On the other hand, if two stripe-shaped louver layers as shown in FIG. 5 are laminated so that the light shielding bands 32 of each layer are orthogonal to each other, it is considered that peeping from the left and right directions and the opposite side of the display screen can be prevented. It is done.
However, in such a configuration in which the light shielding layers are orthogonal to each other, visual recognition from the front side of the user is prevented in addition to the left and right sides and the opposite side of the display screen. For this reason, if the user has a viewpoint in the vicinity of the normal direction of the display screen, the display screen can be viewed well. For example, a user who views the display screen from a lower position on the near side, such as a wheelchair user. There is a problem that visibility is impaired.

  The present invention has been made to solve the above problems, and provides a peep prevention body capable of preventing peeping from the left and right sides and the opposite side without impairing the visibility from the front side of the display screen. The purpose is to do.

  In order to achieve the above object, the peep prevention body of the present invention includes a first louver layer in which light transmission bands and light shielding bands are alternately arranged, and light transmission bands and light shielding bands are alternately arranged. The second louver layer is laminated in the thickness direction, and the length direction of the light shielding band of the first louver layer and the length direction of the light shielding band of the second louver layer are orthogonal to each other. The light-shielding band in the second louver layer is inclined with respect to the surface of the second louver layer.

  ADVANTAGE OF THE INVENTION According to this invention, the peep prevention body which can prevent peeping from the right-and-left side and the opposite side is obtained, without impairing the visibility from the near side of a display screen.

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.
In FIG. 1, in the state in which the thickness direction of the peep prevention body 1 is the Z direction, and the peep prevention body 1 is mounted on the display screen, the viewing side is the Z1 side and the display screen side Is the Z2 side.
In addition, the two directions perpendicular to each other in the plane perpendicular to the Z direction are the X direction and the Y direction, respectively. With the peeping prevention body 1 mounted on the display screen, the horizontal direction of the display screen is the X direction. Let the direction be the Y direction. When the user views the display screen, the front side is the Y1 side, and the opposite side is the Y2 side.

The peep prevention body 1 of the present embodiment includes an adhesive layer 14, a first louver layer 10, a second louver layer 20, and a transparent resin layer 13 in order from the display screen side (Z2 side) in the thickness direction. They are laminated in order and integrated with each other.
The overall planar shape of the peep 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.

[First louver layer]
In the first louver layer 10, light transmission bands 11 and light shielding bands 12 are alternately arranged in the X direction.
Each of the light transmission band 11 and the light shielding band 12 constituting the first louver layer 10 has a band shape extending in the Y direction, and the width in the X direction is uniform and constant.
In the first louver layer 10, an angle α1 formed between the surface of the first louver layer 10 and the light shielding band 12 is approximately 90 ° (greater than 85 ° and smaller than 95 °), and preferably 90 °. .

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, the light-shielding property is such that only the light-shielding band 12 has a light transmittance of 40% or less, preferably 10% or less when light is transmitted in the width direction (X direction in this figure). It is preferable to have. Moreover, since the color tone of the light shielding band 12 constitutes the color tone recognized when the first louver layer 10 is viewed, it is preferable to design it 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. When a black pigment is not used, it is preferable to use a white pigment in combination in order to obtain good light shielding properties.
In the first 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 viewpoint of adhesion between the light shielding band 12 and the light shielding band 12, it is preferable that both are the same.

FIG. 2 is a cross-sectional view of the peep prevention body 1 of the present embodiment cut along the XZ plane. In the first louver layer 10, the viewing angle θ1 in the XZ plane (paper surface in FIG. 2) corresponds to the viewing angle in the horizontal direction of the screen when the peep prevention body 1 is applied on the display screen.
The ratio of the width W11 of the light transmission band 11 and the width W12 of the light shielding band 12 in the X direction of the first louver layer 10 affects the transmittance of the light rays parallel to the Z direction in the first louver layer 10.
Specifically, the viewing angle θ1 in the first louver layer 10 is preferably in the range of 30 to 150 °, more preferably 50 to 120 °.
The width W11 in the X 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 W12 of the light shielding band 12 in the X 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 T1 of the first louver layer 10 in the Z direction is preferably about 0.1 to 2.5 mm, and more preferably about 0.14 to 0.6 mm.

  The first louver layer 10 having such a configuration can be manufactured as follows. First, a plurality of first sheets made of the constituent material of the light transmission band 11 and having the thickness W11, and a plurality of second sheets made of the constituent material of the light shielding band 12 and having the thickness W12, Are alternately laminated, and heated and pressed to form a block body in which the plurality of sheets are integrated. Next, the first 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 T1.

[Second louver layer]
In the second louver layer 20, light transmission bands 21 and light shielding bands 22 are alternately arranged in the Y direction.
The first difference between the second louver layer 20 and the first louver layer 10 is that the light transmission band 11 and the light-shielding band 12 in the first louver layer 10 both have a strip shape extending in the Y direction. On the other hand, the light transmission band 21 and the light-shielding band 22 in the second louver layer 20 are both strips extending in the X direction. That is, the length direction (Y direction) of the light shielding band 12 of the first louver layer 10 and the length direction (X direction) of the light shielding band 22 of the second louver layer 20 are orthogonal to each other.
The second difference is that in the first louver layer 10, the angle α 1 formed between the surface of the first louver layer 10 and the light shielding band 12 is approximately 90 °, whereas in the second louver layer 20. The light shielding band 22 is provided obliquely with respect to the surface of the second louver layer 20. The angle α2 formed between the normal direction (Z direction) of the surface of the second louver layer 20 and the light shielding band 22 is preferably within a range of 5 to 30 °, and more preferably within a range of 10 to 20 °. As α2 increases, the visibility from the near side when the peep prevention body 1 is applied on the display screen is improved, while the transmittance of the light rays parallel to the Z direction in the second louver layer 20 decreases. Tend. If α2 is within the above range, both good visibility from the near side and good visibility from the screen normal direction can be achieved.
The materials of the light transmission band 21 and the light shielding band 22 in the second louver layer 20 are the same as those of the light transmission band 11 and the light shielding band 12 in the first louver layer 10.

FIG. 3 is a cross-sectional view of the peep prevention body 1 of the present embodiment cut along a YZ plane. In the second louver layer 20, the viewing angle θ2 in the YZ plane (paper surface in FIG. 3) corresponds to the viewing angle in the vertical direction of the screen when the peep prevention body 1 is applied on the display screen.
The width W 21 of the light transmission band 21 and the width W 22 of the light shielding band 22 in the second louver layer 20 are widths in a direction perpendicular to the interface between the light transmission band 21 and the light shielding band 22.
In the second louver layer 20, the transmittance of light rays parallel to the Z direction is determined by the ratio between the width W 21 of the light transmission band 21 and the width W 22 of the light shielding band 22 in the second louver layer 20 and the second louver layer 20. The surface α is affected by the angle α2 formed by the normal direction (Z direction) of the surface and the light shielding band 22.
Specifically, the viewing angle θ2 in the second louver layer 20 is preferably in the range of 60 to 150 °, more preferably 90 to 120 °. In particular, the viewing angle magnitude θ3 on the Y2 side (opposite side) with respect to the Z direction is preferably 0 to 50 °, more preferably 10 to 40 °. Further, the viewing angle size θ4 on the Y1 side (near side) with respect to the Z direction is preferably 30 to 90 °, and more preferably 40 to 70 °.
The width W21 of the light transmission band 21 and the width W22 of the light shielding band 22 in the second louver layer 20 are the same as the width W11 of the light transmission band 11 and the width W12 of the light shielding band 12 in the first louver layer 10, respectively.
The thickness T2 in the Z direction of the second louver layer 20 is preferably about 0.1 to 2.5 mm, and more preferably about 0.14 to 0.4 mm. The thickness T1 of the first louver layer 10 and the thickness T2 of the second louver layer 20 may be the same or different.

The second louver layer 20 having such a configuration is manufactured by using the same block body (sheet laminate) as that used for manufacturing the first louver layer 10 and manufacturing the first louver layer 10. What is necessary is just to slice the place which slices this block body perpendicularly | vertically with respect to the sheet | seat surface.
That is, as shown in FIG. 4, the plurality of first sheets 21 a made of the constituent material of the light transmission band 21 and having the thickness W21 and the constituent material of the light shielding band 22 have the thickness W22. A plurality of second sheets 22a are alternately stacked, and heated and pressed to form a block body in which the plurality of sheets are integrated. Next, the second louver layer 20 is obtained by slicing the block body with an oblique cut surface having a predetermined angle α3 (α3 = 90 ° + α2) with respect to the sheet surface. The thickness (slice width) when slicing is T2.

The method for integrating the first louver layer 10 and the second louver layer 20 is not particularly limited, and a known method can be appropriately used.
For example, a method of adhering both using an adhesive having transparency after curing is preferable. Examples of such adhesives include thermosetting adhesives that are transparent after curing, multi-component reaction adhesives, UV curable adhesives, and the like. Specifically, epoxy adhesives, urethane adhesives, acrylics, etc. A system adhesive, a melamine adhesive, a polyester adhesive, a silicone adhesive, and the like can be suitably used.

[Transparent resin layer]
As the material of the transparent resin layer 13, the resins listed above as the material of the light transmission band 11 (21) can be used. The light transmittance when light is transmitted in the Z direction in the figure relative to a single transparent resin layer 13 is preferably 75% or more, and more preferably 85% or more.
The material of the transparent resin layer 13 is particularly preferably a polycarbonate resin, a polyester resin, an acrylic resin, an polyolefin resin (particularly a cycloolefin polymer), or a cellulose resin from the viewpoint of transparency and heat resistance. A resin is more preferable.
If the thickness of the transparent resin layer 13 in the Z direction is too thin, a sufficient protective function cannot be obtained, and the light transmittance decreases as the thickness increases, so about 0.01 to 0.5 mm is preferable. About 2 mm is more preferable.

The method for integrating the second louver layer 20 and the transparent resin layer 13 is not particularly limited, and a known method can be used as appropriate.
For example, a method may be used in which an adhesive is applied to the surface of the second louver layer 20, a sheet made of the material of the transparent resin layer 13 is bonded, and then 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 peep prevention body 1 of this embodiment is bonded and fixed on the display screen by the adhesive layer 14. At this time, they may be bonded so that they can be easily peeled off, or may be bonded with an adhesive strength that cannot be easily peeled off, and can be selected according to the application.
When the adhesive layer 14 is easily removably bonded, the material of the pressure-sensitive adhesive layer 14 only needs to have a re-peelable adhesive force, and is preferably highly transparent. 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.

  When the peep prevention body 1 is adhered on the display screen to such an extent that it cannot be easily peeled off, the material of the adhesive layer 14 is preferably a material having a sufficient adhesive force and high transparency. Specific examples include acrylic adhesives and urethane adhesives. Among these, acrylic pressure-sensitive adhesive materials are more preferable in terms of adhesive strength.

  The light transmittance in the whole peeping prevention body 1 is preferably 45% or more, and more preferably 55% or more. The upper limit of the light transmittance is preferably higher, but about 80% is the limit to achieve the peep prevention function.

The peep prevention body 1 according to the present embodiment is used, for example, by sticking an adhesive layer 14 on a bank ATM display screen. At this time, as viewed from the user, the X direction in the figure is the horizontal direction of the display screen, the Y direction is the vertical direction of the display screen, the Y1 side is the front side of the user, and the Y2 side is the opposite side.
According to the peep prevention body of the present embodiment, the first louver layer 10 prevents peeping from the left and right sides of the display screen. The second louver layer 20 prevents peeping from the opposite side of the user. Further, since the direction of the light-shielding band 22 in the second louver layer 20 is provided obliquely so as to be tilted to the Y1 side (front side) with respect to the Z direction, from the vicinity of the normal direction (Z direction) of the display screen. Good visibility can be ensured not only for the user viewing the display screen but also for the user viewing the display screen from a lower position on the near side.

  Note that the stacking order of the first louver layer 10 and the second louver layer 20 in this embodiment may be reversed. That is, the same effect can be obtained even when the adhesive layer 14, the second louver layer 20, the first louver layer 10, and the transparent resin layer 13 are laminated in order from the display screen side (Z2 side).

In the present embodiment, the light transmission band 11 and the light shielding band 12 of the first louver layer 10 extend in parallel to the Y direction, and the light transmission band 21 and the light shielding band 22 of the second louver layer 20 are aligned in the X direction. It extends in parallel. That is, the angle formed by the length direction of the light shielding band 12 of the first louver layer 10 and the length direction of the light shielding band 22 of the second louver layer 20 is 90 °, but this angle is not necessarily 90 °. The allowable range is 90 ° ± 15 ° (75 to 105 °). Particularly preferred is 90 °.
In other words, in the present invention, “the length direction of the light shielding band of the first louver layer and the length direction of the light shielding band of the second louver layer are orthogonal” means the length of the light shielding band of the first louver layer. This means that the angle between the direction and the length direction of the light shielding band of the second louver layer is in the range of 90 ° ± 15 ° (75 to 105 °), and a particularly preferred angle is 90 °.

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 FIGS.
First, a first sheet having a thickness of 200 μm made of transparent silicone rubber (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: KE153U) was prepared as the light transmission band 11 (21).
Separately from this, the light shielding band 12 (22) is 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). Two sheets were 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 first louver layer 10 was produced by slicing the block body to a thickness (T1) of 360 μm at a cut surface perpendicular to the sheet surface.
Further, the same block body was sliced to a thickness (T2) of 360 μm at an oblique cut surface where the angle α3 shown in FIG. 4 was 105 °, thereby producing the second louver layer 20. The angle α2 with respect to the Z direction of the light shielding band 22 in the second louver layer 20 was 15 °.

The one surface of the first louver layer 10 and the one surface of the second louver layer 20 obtained in this manner are overlapped so that the length directions of the light shielding bands are perpendicular to each other at an angle of 90 °. Turned into. As the adhesive, a two-component curable silicone rubber (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: KE1935) was used.
On the other surface of the first louver layer 10, an adhesive layer 14 was formed by a screen printing method using a two-component curable silicone rubber (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: KE1935).
Further, a polycarbonate sheet (transparent resin layer 13) coated with a thermosetting adhesive (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: KE1825) is bonded to the other surface of the second louver layer, and the adhesive is heated. Cured.
In the viewing prevention body 1 thus obtained, the viewing angle θ1 in the X direction (left-right direction of the screen) is 90 °, and the viewing angle θ3 on the Y2 side (opposite side) of the viewing angles in the Y direction is 30 °, Y1 side. The (front side) viewing angle θ4 was 60 °. The total light transmittance was 60%.

  The peep prevention body of the present invention is applied to, for example, an information display body display screen in bank ATMs, automatic ticket vending machines, etc., and prevents peeping from three directions among the four directions of the display screen. On the other hand, good visibility from the remaining one direction and the vicinity of the normal direction of the screen can be ensured.

It is a disassembled perspective view which shows embodiment of this invention. It is sectional drawing in the XZ plane of FIG. It is sectional drawing in the YZ plane of FIG. It is explanatory drawing of the manufacturing method of a 2nd louver layer. It is the top view which showed typically an example of the conventional peep prevention body. It is the top view which showed typically the other example of the conventional peep prevention body.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Peep prevention body 10 1st louver layer 11 Light transmission band 12 Light shielding band 20 Second louver layer 21 Light transmission band 22 Light shielding band

Claims (1)

A first louver layer in which light transmission bands and light shielding bands are alternately arranged;
A second louver layer in which light transmission bands and light shielding bands are alternately arranged is laminated in the thickness direction,
The length direction of the light shielding band of the first louver layer is orthogonal to the length direction of the light shielding band of the second louver layer,
A peep prevention body, wherein a light shielding band in the second louver layer is inclined with respect to the surface of the second louver layer.

Images