JP2018182641A - Screen protecting sheet for mobile electronic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a screen protecting sheet for a mobile electronic device, by which interference fringes disappear easily after a cause of a flexure in a base material sheet has been eliminated.SOLUTION: A screen protection sheet for a mobile electronic device comprises: an external surface layer having an edge curved in a thickness direction over a perimeter of an outer peripheral portion; and a sticking layer formed so as to surround at least a region corresponding to a screen of a mobile electronic device on the backside of the external surface layer, in which a communication region for communicating the region to outside is formed. The sticking layer has: a pair of adhesive layers having tackiness; and a base material layer which overlies the pair of adhesive layers in the thickness direction between the pair of adhesive layers.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a screen protection sheet for protecting a screen of a portable electronic device such as a tablet or a smartphone.

  Conventionally, a screen protection sheet (hereinafter referred to as a screen protection sheet) for a portable electronic device for protecting the screen of the portable electronic device from scratches and dirt is provided, and such a screen protection sheet is a portable electronic device. Some have been configured to cover the entire front, including the screen.

  For example, as shown in FIGS. 8 and 9, the screen protection sheet disclosed in Patent Document 1 includes a flat base sheet 60 (see FIG. 8) and an adhesive provided on one side of the base sheet 60. And a layer 61 (see FIG. 9).

  As shown in FIG. 9, the adhesive layer 61 is configured by arranging a plurality of adhesive portions 610 along the outer peripheral portion of the base sheet 60, and a gap 611 is formed between adjacent adhesive portions 610. There is. That is, the adhesive layer 61 is provided on the front surface of the portable electronic device at a position corresponding to the area outside the screen.

  According to the screen protection sheet 6, when the adhesive layer 61 is attached to the front surface of the portable electronic device, air between the base sheet 60 and the screen of the portable electronic device is discharged from the gap 611 to the outside. Therefore, the substrate sheet 60 and the screen of the portable electronic device are in close contact with each other, no air bubbles are left between them, and the sticking is beautiful.

JP, 2013-107996, A

  By the way, in the screen protection sheet 6 in which the adhesive layer 61 is configured by the adhesive portion 610 provided on the outer peripheral portion of the substrate sheet 60 as described above, the substrate is adhered in the front surface of the portable electronic device. Since the sheet 60 and the screen of the portable electronic device do not stick to each other (only in close contact), a minute gap may partially occur between the two. For example, when the user of the portable electronic device presses the screen through the screen protection sheet 6 or wipes the dirt on the surface, a portion between the bent base sheet 60 and the screen of the portable electronic device As a result of the formation of fine gaps, interference fringes occur around the portion of the substrate sheet 60 in close contact with the screen of the portable electronic device.

  Further, in the conventional screen protection sheet 6, the space between the front surface (screen) of the portable electronic device and the substrate sheet 60 is substantially zero, and the substrate sheet 60 is in close contact with the front surface of the portable electronic device. The front shape may remain in partial contact without returning to its original shape.

  Therefore, after the user removes the finger from the surface of the screen protection sheet 6, that is, the interference fringes generated on the screen protection sheet 6 for a long time even after the factor of the bending of the base sheet 60 is removed. The rest may give the user a sense of discomfort.

  Further, in recent years, portable electronic devices having a rounded shape have been increased such that the outer peripheral portion protrudes outward over the entire periphery. As a screen protection sheet for such portable electronic devices, the entire outer peripheral portion is disclosed. There is also provided one comprising a substrate sheet whose edges are curved in the thickness direction over the circumference.

  And also in this screen protection sheet, since the sticking layer comprised by the adhesion part is formed in the peripheral part of the one side of a substrate sheet, it is the same as screen protection sheet 6 indicated by patent documents 1 Problems will arise.

  Then, this invention makes it a subject to provide the screen protection sheet for portable electronic devices in which an interference fringe tends to disappear after the factor of bending of a substrate sheet is removed in view of this situation.

  The screen protection sheet for portable electronic devices according to the present invention covers the outer surface layer whose edge is curved in the thickness direction over the entire outer periphery, and at least the region corresponding to the screen of the portable electronic device on the back side of the outer surface layer. An adhesive layer formed as described above, wherein the adhesive layer has a communication region for communicating the region with the outside, and the adhesive layer comprises a pair of adhesive layers having adhesiveness, and the pair And a base material layer overlapping the pair of adhesive layers in the thickness direction between the adhesive layers.

  According to this configuration, in the sticking layer to be stuck to the portable electronic device, since the base material layer is provided between the pair of adhesive layers, the sticking layer is formed by covering the screen of the portable electronic device with the outer surface layer. When the mobile electronic device is attached, the distance between the outer surface layer and the screen of the mobile electronic device is increased by the thickness of the base layer.

  When the user of the portable electronic device presses the screen over the screen protection sheet with his finger or wipes the dirt on the surface of the screen protection sheet by an amount corresponding to an increase in the distance between the outer surface layer and the screen of the portable electronic device. The spread of the contact area between the screen protection sheet and the screen can be suppressed.

  As a result, in the screen protection sheet for portable electronic devices, the outer surface layer is easily separated from the screen after the factor of the deflection of the outer surface layer is removed, for example, after the user removes the finger from the surface of the screen protection sheet. The interference fringes generated in the area corresponding to the screen of the portable electronic device are likely to disappear.

  Further, in the screen protection sheet for the portable electronic device, since the communication area is expanded by increasing the thickness of the adhesive layer, the flow of air between the internal area and the outside becomes smooth, and the screen is deformed to bend toward the screen. The shape of the outer surface layer is likely to recover. Therefore, in the screen protection sheet for the portable electronic device, the generated interference fringes are more easily eliminated.

  In the screen protection sheet for portable electronic devices of the present invention, a flat plate-like intermediate layer is provided on at least a region corresponding to the screen of the portable electronic device on the back surface side of the outer surface layer. A plurality of convex portions may be formed on one side of the side.

  According to this configuration, when the outer surface layer is pressed, the intermediate layer comes in contact with the screen of the portable electronic device, but since a plurality of convex portions are formed on one surface of the intermediate layer, the intermediate layer is formed. The contact area between the and the screen of the portable electronic device can be reduced.

  That is, in the screen protection sheet for the portable electronic device, since the adhesion between the screen of the portable electronic device and the intermediate layer in contact with the screen is suppressed, the intermediate layer is removed when the factor of the deflection of the outer surface layer is removed. Is more likely to leave the screen.

  In the screen protection sheet for portable electronic devices of the present invention, the thickness of the sticking layer may be 40% to 60% of the thickness of the outer surface layer.

  According to this configuration, it is possible to achieve both the ease of contacting the screen of the portable electronic device when pressing the outer surface layer and the ease of leaving the screen when releasing the finger from the outer layer. When the screen of the device projects an image output from the touch panel, the interference fringes can be easily eliminated without impairing the operability of the touch panel.

  In the screen protection sheet for portable electronic devices of the present invention, the thickness of the outer surface layer may be 0.33 mm, and the thickness of the sticking layer may be 0.125 mm to 0.2 mm.

  In this configuration as well, it is possible to achieve both the ease of contacting the screen of the portable electronic device when pressing the outer surface layer and the ease of leaving the screen when releasing the finger from the outer surface layer. In the case where the screen of (1) projects an image output from the touch panel, the interference fringes can be easily eliminated without impairing the operability of the touch panel.

  As described above, according to the screen protection sheet for portable electronic devices of the present invention, it is possible to achieve an excellent effect that the interference fringes are easily eliminated after the factor of the bending of the base material sheet is removed.

In FIG. 1, (a) is a view of a screen protection sheet for a portable electronic device according to an embodiment of the present invention as viewed from the front side, and (b) is a view as viewed from the back side. FIG. 2 is a view of the screen protection sheet for the portable electronic device according to the embodiment as viewed from the lower end side. FIG. 3 is an enlarged view of area A of FIG. FIG. 4 is a plan view of an intermediate layer of the screen protection sheet for the portable electronic device according to the embodiment. FIG. 5: is a top view of the sticking layer of the screen protection sheet for portable electronic devices which concerns on the embodiment. FIG. 6 is a plan view of the portable electronic device to which the screen protection sheet for the portable electronic device according to the embodiment is attached. FIG. 7 is an explanatory view of a screen protection sheet for a portable electronic device according to the embodiment, where (a) is an explanatory view of a state in which the screen of the portable electronic device is pushed over the outer surface layer; These are explanatory drawings of the state which released the finger from the outer surface layer. FIG. 8 is a perspective view of a screen protection sheet for a conventional portable electronic device. FIG. 9 is a view of the screen protection sheet for the conventional portable electronic device as viewed from the back side.

  Hereinafter, a screen protection sheet for a portable electronic device (hereinafter, referred to as a screen protection sheet) according to an embodiment of the present invention will be described with reference to the attached drawings.

  The screen protection sheet is for protecting the screen of a portable electronic device such as a tablet or a smartphone from scratches and dirt. In the present embodiment, the following description will be made on the premise that the screen 50 of the smartphone 5 as a portable electronic device as shown in FIG. 6 is protected.

  The screen 50 is a surface on which a user of a portable electronic device can visually recognize an image (image, moving image, etc.) output from a liquid crystal element or a touch panel, and will be described later in this embodiment. The front cover 51 constitutes a screen.

  Before describing the screen protection sheet, the structure of the smartphone 5 will be described. The front surface of the smartphone 5 is constituted by a front cover 51, and on the rear side of the front cover 51, a touch panel 52, an operation button 53, an imaging element 54, and a speaker 55 are disposed.

  The front cover 51 is formed to have a substantially rectangular shape in plan view. The front cover 51 has a flat surface area 510 and an edge area extending outward from the entire periphery of the surface area 510 and having a rounded cross section (curved shape). And 511 are included (see FIGS. 7A and 7B).

  In addition, through holes are formed in the front cover 51 according to the arrangement positions of the operation button 53, the imaging device 54, and the speaker 55, for example, and the operation button 53, the imaging device 54, and the speaker 55 are on the front side of the smartphone 5. It is supposed to be exposed by

  The touch panel 52 is disposed at a position corresponding to a substantially central portion of the front cover 51. Therefore, the front cover 51 (the front surface of the smartphone 5) includes a display area in which the touch panel 52 is overlapped and an outer frame area around the outer periphery of the display area, and the display area is transparent.

  As shown in FIGS. 1 (a), 1 (b) and 2, the screen protection sheet 1 according to the present embodiment is an outer surface layer 2 in which the edge 21 is curved over the entire periphery of the outer periphery 20; It is provided with an intermediate layer 3 which is flat and provided so as to overlap the outer surface layer 2 and an adhesive layer 4 provided so as to overlap the intermediate layer 3.

  In the present embodiment, the direction in which the outer surface layer 2, the intermediate layer 3 and the adhesive layer 4 overlap is referred to as a stacking direction, and the direction orthogonal to the stacking direction is referred to as an inward / outward direction.

  As shown in FIG. 2, the outer surface layer 2 includes a flat portion 22 in the form of a flat plate, and the edge portion 21 is continuous over the entire outer periphery of the flat portion 22. Therefore, the outer peripheral portion 20 of the outer surface layer 2 is configured by the outer peripheral portion of the flat portion 22 and the edge portion 21.

  One plate surface (hereinafter, referred to as a back surface) of the flat portion 22 is disposed toward the screen 50 side. The other plate surface (hereinafter referred to as the surface) of the flat portion 22 constitutes the surface of the screen protection sheet 1. That is, the surface of the flat portion 22 is a surface that the user of the portable electronic device touches.

  The edge portion 21 extends outward from the outer periphery of the flat portion 22 and is curved so as to face the back surface side. In other words, the edge portion 21 has a shape curved in the stacking direction (the thickness direction of the outer surface layer 2), the outer peripheral surface becomes a part of the surface of the outer surface layer 2, and the inner peripheral surface is a part of the rear surface of the outer surface layer 2. It is configured to be

  Furthermore, as shown to Fig.1 (a), the several through-hole 23 is formed in the outer surface layer 2 which concerns on this embodiment. In the outer surface layer 2 of the present embodiment, an operation outer hole 230 formed as a through hole 23 at a position corresponding to the operation button 53 and an imaging outer hole 231 formed at a position corresponding to the imaging device 54 , And a sound transmission outer hole 232 formed at a position corresponding to the speaker 55.

  The outer surface layer 2 is made of glass. The thickness W1 (see FIG. 3) of the outer surface layer 2 can be set between 0.07 mm and 0.4 mm, and is set to 0.33 mm in the present embodiment.

  The mid layer 3 is configured by bonding one surface of the sheet material to the back surface of the outer surface layer 2.

  Further, the intermediate layer 3 has a plurality of projections formed on one surface opposite to the one surface bonded to the outer surface layer 2. That is, the intermediate layer 3 is configured by a so-called dot film.

  As shown in FIG. 4, in the intermediate layer 3 according to the present embodiment, a communication hole 30 communicating with the through hole 23 of the outer surface layer 2 is formed. In the intermediate layer 3 of the present embodiment, as the communication hole 30, the operation communication hole 300 communicating with the operation outer hole 230, the imaging communication hole 301 communicating with the imaging outer hole 231, and the sound transmission outer hole A sound communication hole 302 communicating with 232 is formed.

  The thickness W2 (see FIG. 3) of the intermediate layer 3 is set to about 0.075 mm. Moreover, the space | interval of the convex part (dot) of the intermediate | middle layer 3 can be set between 0.5 mm-1.0 mm, and is set to 0.8 mm by this embodiment.

  As shown in FIG. 5, the sticking layer 4 corresponds to an area corresponding to the inner side than the outer peripheral portion 20 of the outer surface layer 2 at a position corresponding to the outer peripheral portion 20 of the outer surface layer 2, It is provided to surround the area to be In the present embodiment, a region surrounded by the sticking layer 4 is referred to as an inner region 40.

  Further, in the sticking layer 4, a communication region 41 for communicating the internal region 40 with the outside is formed. In the sticking layer 4 of the present embodiment, an opening region formed as the communication region 41 so as to allow the internal region 40 to communicate with the outside in the inside and outside direction (in the present embodiment, the direction along the longitudinal direction of the smartphone 5). A concave area 411 formed to be concave outward from the inner area 40 side toward the outer side (in the present embodiment, a direction along the longitudinal direction of the smartphone 5) from the inner area 40 side is formed.

  The opening area 410 is continuous with the operation outer hole 230 and the operation communication hole 300, as shown in FIG. 1 (b). Therefore, the internal region 40 of the present embodiment communicates with the outside (the outside air around the smartphone 5) through the opening region 410, the operation outer hole 230, and the operation communication hole 300.

  The recessed area 411 is formed to include a region overlapping the imaging outer hole 231, the sound transmission outer hole 232, the imaging communication hole 301, and the sound communication hole 302 in the stacking direction. Therefore, the internal area 40 communicates with the outside through the concave area 411, the imaging outer hole 231, the sound transmission outer hole 232, and the concave area 411, the imaging communication hole 301, and the sound communication hole 302. There is.

  In addition, in the sticking layer 4, while the opening area | region 410 is formed so that it may penetrate in the said in-and-out direction, since the concave area 411 is non-penetrating in the said in-and-out direction, handle the whole sticking layer 4 as one sheet. Can. Therefore, at the time of manufacturing the screen protective sheet 1, alignment of the sticking position of the sticking layer 4 to the outer surface layer 2 becomes easy.

  Furthermore, as shown in FIG. 3, the sticking layer 4 according to the present embodiment has a pair of sticky adhesive layers 42 and a base material layer 43 interposed between the pair of sticky layers 42. It is configured.

  In addition, thickness W3 (refer FIG. 3) as the sticking layer 4 whole should just be set between 0.15 mm-0.2 mm, and is set to 0.2 mm by this embodiment.

  Although the thickness of the sticking layer 4 may be set to be about 40% to 60% of the thickness of the outer surface layer 2, in the present embodiment, it is set to about 60% of the thickness of the outer surface layer 2.

  The configuration of the screen protection sheet 1 according to the present embodiment is as described above. In the screen protection sheet 1 according to the present embodiment, since the base layer 43 is provided between the pair of adhesive layers 42 of the adhesive layer 4 attached to the front surface of the smartphone 5, the smartphone (portable electronic device When the adhesive layer 4 is attached to the smartphone 5 so as to cover the screen 50 of the device 5), the distance between the outer layer 2 and the screen 50 (display area) of the smartphone 5 is equal to the thickness of the base layer 43 spread.

  And since the space | interval of the exterior layer 2 and the screen 50 of the smart phone 5 was expanded, as shown to Fig.7 (a), the user of the smart phone 5 presses the screen 50 (touch panel 52) over the exterior layer 2 with a finger. Or the spread of the contact area between the screen protection sheet 1 and the screen 50 when the screen protection sheet 1 is cleaned of dirt. In the present embodiment, since the intermediate layer 3 is disposed to face the screen 50, the expansion of the contact area between the intermediate layer 3 and the screen 50 can be suppressed.

  As a result, in the screen protection sheet 1, the size itself of the interference fringes generated in the outer surface layer 2 can be suppressed to a small size because the expansion of the contact area with the screen 50 is suppressed. In addition, after the user of the user removes the finger from the surface of the outer surface layer 2, the screen protection sheet 1 (in the present embodiment, the intermediate layer 3) tends to be separated from the screen 50 after the factor of the deflection of the outer surface layer 2 is removed. Therefore, the interference fringes generated in the area corresponding to the screen 50 of the smartphone 5 can be easily eliminated (disappeared quickly).

  Further, in the intermediate layer 3 of the present embodiment, a plurality of convex portions are formed on one surface opposite to the outer surface layer 2 side, so the contact area between the intermediate layer 3 and the screen 50 is suppressed. Accordingly, since the adhesion between the screen 50 of the smartphone 5 and the intermediate layer 3 in contact with the screen 50 is suppressed, the intermediate layer 3 is easily separated from the screen 50 when the factor of the deflection of the outer surface layer 2 is removed. .

  In the present embodiment, by setting the distance between the convex portions (dots) of the intermediate layer 3 to 0.8 mm, close contact between the intermediate layer 3 and the screen 50 while preventing the visibility of the screen 50 from being impaired. The effect of suppressing sexuality is enhanced. As a result, the screen protection sheet 1 according to the present embodiment can achieve both the ease of viewing an image, a moving image, and the like displayed on the screen 50 and the ease of disappearance of interference fringes.

  Furthermore, when the screen protection sheet 1 is attached to the screen 50 of the smartphone 5, the communication area 41 (the opening area 410, the concave area 411) is a flow path for circulating air between the inner area 40 and the outside of the inner area 40. It becomes. Therefore, with the shape return of the screen protection sheet 1 (the outer surface layer 2 and the intermediate layer 3) bent to the screen 50 side of the smartphone 5, external air enters the internal region 40 through the communication region 41, The shape of the screen protection sheet 1 is easily restored.

  Furthermore, in the screen protection sheet 1 of the present embodiment, the communication region 41 (the cross-sectional area of the communication region 41) is expanded by increasing the thickness of the adhesive layer 4 (more specifically, the communication region 41 in the stacking direction) When the user releases the finger from the outer surface layer 2, that is, when the shape of the outer surface layer 2 and the intermediate layer 3 bent toward the screen 50 is restored, the inner region Air flows into 40 smoothly. Further, since the deflection amount of the screen protection sheet 1 at the time of screen operation is increased by the increase of the thickness of the adhesive layer 4, the repulsive force (force in the direction of reducing the deflection) of the screen protection sheet 1 also becomes large. Therefore, it is difficult to maintain a state in which the air pressure between the outer surface layer 2 and the intermediate layer 3 and the screen 50 is reduced, and the shape of the screen protection sheet 1 is easily restored.

  And, in the present embodiment, the thickness of the outer layer 2 is 0.33 mm and the thickness of the adhesive layer 4 is 0.2 mm, that is, the thickness of the adhesive layer 4 is about 60% of the thickness of the outer layer 2 Then, when the outer surface layer 2 is pressed, it is prevented that the outer surface layer 2 hardly contacts the screen 50, and the outer surface layer 2 is also prevented from becoming difficult to separate from the screen 50. Therefore, in the state where the screen protection sheet 1 is attached to the screen 50 of the smartphone 5, the interference fringes can be easily eliminated without impairing the operability of the touch panel 52.

  Furthermore, in the intermediate layer 3 in which a plurality of convex portions (dots) are formed, as the distance between the convex portions decreases, the effect of suppressing the adhesion with the screen 50 increases, while the transparency (that is, the visibility of the screen 50) As the distance between the convex portions is increased, the effect of suppressing the adhesion to the screen 50 is reduced, while the transparency (that is, the visibility of the screen 50) is increased.

  The screen protection sheet of the present invention is not limited to the above-described embodiment, and it goes without saying that various changes can be made without departing from the scope of the present invention.

  In the above embodiment, the screen protection sheet 1 has a rectangular shape in plan view, but the shape of the screen protection sheet 1 can be changed according to the shape of the portable electronic device to be attached.

  In the above embodiment, the through holes 23 (operation outer holes 230, imaging outer holes 231, sound transmission outer holes 232) formed in the outer surface layer 2 and the communication holes 30 formed in the middle layer 3 (for operation) The communication hole 300, the communication hole 301 for imaging, the communication hole 302 for sound transmission, and the communication area 41 (opening area 410, concave area 411) of the sticking layer 4 correspond to those of the operation button 53 of the smartphone 5, the imaging element 54, and the speaker 55. It may be formed at a position corresponding to the arrangement.

  In the above-mentioned embodiment, although one opening field 410 was formed in pasting layer 4, two or more opening fields 410 may be formed in pasting layer 4, for example.

  In the said embodiment, although the opening area | region 410 was formed so that the internal area | region 40 and the exterior might be connected in the direction in alignment with the longitudinal direction of the smart phone 5, it is not limited to this structure. For example, the opening area 410 may be formed to communicate the internal area 40 with the outside in the direction along the width direction of the smartphone 5. That is, the opening area 410 may be provided on the side of the sticking layer 4.

  In the above-described embodiment, one concave region 411 is formed in the sticking layer 4, but, for example, two or more concave regions 411 may be formed in the sticking layer 4.

  In the said embodiment, although the concave area | region 411 was formed so that it might become concave toward the outer side in the direction in alignment with the longitudinal direction of the smart phone 5, it is not limited to this structure. For example, the concave area 411 may be formed to be concave outward. That is, the concave area 411 may be provided on the side of the adhesive layer 4.

  As described above, the number of communication regions 41 can be set as long as the region surrounded by the outer surface layer 2 (or the intermediate layer 3), the sticking layer 4 and the screen 50 to which the sticking layer 4 is attached can be communicated with the outside The shape is not particularly limited.

  DESCRIPTION OF SYMBOLS 1 ... Screen protection sheet, 2 ... outer surface layer, 3 ... middle layer, 4 ... sticking layer, 5 ... smart phone, 20 ... outer peripheral part, 21 ... edge part, 22 ... plane part, 23 ... through hole, 30 ... communicating hole, DESCRIPTION OF SYMBOLS 40 ... Internal area, 41 ... Communication area, 42 ... Adhesive layer, 43 ... Base material layer, 50 ... Screen, 51 ... Front cover, 52 ... Touch panel, 53 ... Operation button, 54 ... Image sensor, 55 ... Speaker, 230 ... Outer hole for operation, 231: outer hole for imaging, 232: outer hole for sound transmission, 300: communication hole for operation, 301: communication hole for imaging, 302: communication hole for sound transmission, 410: opening area, 411: concave Area, 510 ... Plane area, 511 ... Edge area

Claims (4)

  It is an external layer whose edge is curved in the thickness direction over the entire periphery, and a sticking layer formed on the back side of the external layer so as to surround at least a region corresponding to the screen of the portable electronic device And an adhesive layer in which a communication region for communicating with the outside is formed, the adhesive layer comprising a pair of adhesive layers having adhesiveness and the pair of adhesive layers in the thickness direction between the pair of adhesive layers. The screen protection sheet for portable electronic devices which has a base material layer which overlaps with an adhesion layer.   A flat intermediate layer is provided on at least a region corresponding to the screen of the portable electronic device on the back surface side of the outer surface layer, and a plurality of convex portions are formed on one surface of the intermediate layer opposite to the outer surface layer side. The screen protection sheet for portable electronic devices according to claim 1.   The screen protection sheet for portable electronic devices according to claim 1 or 2, wherein the thickness of the adhesive layer is 40% to 60% of the thickness of the outer surface layer.   The thickness of the said outer surface layer is 0.33 mm, The thickness of the said sticking layer is 0.125 mm-0.2 mm, The screen protection sheet for portable electronic devices of Claim 1 or Claim 2.

Images