JP2020030300A - Transparent film for portable terminal - Google Patents

Abstract

To provide a transparent film for a portable terminal, which can be attached so as not to be peeled off from curve start portions of right and left edge parts of a display screen while covering the display screen as much as possible.SOLUTION: The transparent film for a portable terminal for protecting a display screen of a portable terminal having a main body 4 and a display screen 3 provided on the main body, comprises a film main body 1A having a substantially planar-shaped rear surface, and right and left film edge parts 1B extending from right and left ends of the film main body toward the outside in the right and left direction. An adhesive layer 5 for adhering the film main body at least to the display screen is disposed on the rear surface of the film main body. The right and left film edge parts cover curve start portions 3C, from which curves of right and left edge parts 3B of the display screen start, and are formed into a curved surface projecting upward so as to be positioned downward as a rear surface 1R approaches the end along the surface of the curve start portions.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a transparent film for a mobile terminal for protecting a display screen of the mobile terminal.

  As the transparent film for a portable terminal, for example, Patent Document 1 has already been proposed and is shown in FIG. The transparent film 10 for a portable terminal includes a plate-shaped flat tempered glass film 11 made of tempered glass, an adhesive layer 12 located on the back surface of the tempered glass film 11, and a PET layer 13 bonded by the adhesive layer 12. And a sticking layer 14 located on the back surface of the PET layer 13 for sticking the PET layer 13 to the display screen 3 of the mobile terminal 2. The mobile terminal 2 includes a main body 4 having a casing containing various substrates, camera lenses, batteries, and the like. The display screen 3 is provided on the main body 4.

  By the way, in recent years, the display screen of a portable terminal has been enlarged with the appearance of new products. As shown in FIG. 3, the display screen 3 has a screen main body 3A having an upper surface formed in a substantially planar shape, and extends from each of the left and right ends of the screen main body 3A toward the outside in the left-right direction and extends toward the end. Left and right edge portions 3B, 3B that have a curved surface 3b that is upwardly convex so as to be located below and that project in the thickness direction of the main body 4 (only one (right side) is shown in FIG. 3). And Therefore, the size of the transparent film for mobile terminal 10 is set to a size corresponding to the size of the display screen 3 so that the display screen 3 of the mobile terminal 2 can be covered as much as possible.

JP 2013-242567 A (see FIG. 2)

  FIG. 3 shows a case in which the transparent film 10 for a portable terminal of Patent Document 1 is attached to the display screen 3 of the above-described enlarged portable terminal 2. When the transparent film 10 for a portable terminal is attached to the display screen 3, the center part of the substantially planar tempered glass film 11 can be easily attached to the screen main body 3A, but the left and right edges having the curved surface 3b. The left and right end portions 11B, 11B of the tempered glass film 11 (only one (right side) is shown in FIG. 3, but the other is the same) cannot be easily attached to the portions 3B, 3B. This means that the right and left end portions 11B, 11B of the tempered glass film 11 are pressed against the curved surfaces 3b, 3b of the left and right edge portions 3B, 3B of the display screen 3, and are attached. Since the left and right ends 11B of the tempered glass film 11 have stronger restoring force than the sticking layer 14, the left and right ends 11B, 11B of the tempered glass film 11 have left and right edges 3B, It is peeled off from 3B. Therefore, there arises a problem that the left and right end portions 11B, 11B of the tempered glass film 11 float from the bending start portions 3C, 3C where the bending of the left and right edge portions 3B, 3B starts.

  In view of the above situation, the present invention seeks to solve a problem for a portable terminal that can be mounted so as not to float from the start of bending at the left and right edges of the display screen while covering the display screen as much as possible. It is to provide a transparent film.

  In order to solve the above-mentioned problems, a transparent film for a portable terminal of the present invention includes a main body, and a display screen disposed on the main body, wherein the display screen has a substantially flat upper surface. A main body, and a curved surface that is extended outward from the left and right ends of the screen main body toward the left and right sides, and has a curved surface that is upwardly convex so as to be located lower toward the end, and in a thickness direction of the main body. A transparent film for a mobile terminal, which is disposed on the display screen to protect the display screen, the screen body having a substantially flat back surface. A film main body that covers the film main body, a left and right film edge portion extending outward from the left and right ends of the film main body in the left and right direction, an adhesive layer for adhering at least the film main body to the screen main body, Film book The left and right film edges cover the bending start portion where the bending of the left and right edges of the display screen starts, and are located lower as the rear surface approaches the edge so as to be along the surface of the bending start portion. It is characterized by being formed on a curved surface that is convex upward as described above.

  According to this configuration, when the film main body and the left and right film edges are pressed against the display screen, the film main body is adhered to the display screen at least with the adhesive layer provided on the back surface of the film main body. At this time, the left and right film edges having the back surface formed on the curved surface cover the curved start portion along the surface of the curved start portion of the left and right edge portions of the display screen. Therefore, the left and right film edges do not float from the curved start portions of the left and right edges of the display screen. Therefore, not only the screen main body of the display screen but also the curved start portions at the left and right edges can be covered well with the transparent film for mobile terminals.

  Further, the transparent film for a portable terminal of the present invention includes the adhesive layer on the back surface of each of the left and right film edges, and the thickness of the adhesive layer is the lowermost of the back surfaces of the left and right film edges and the film body. Is preferably larger than the distance in the film thickness direction from the back surface of the film.

  According to the above configuration, the thickness of the adhesive layer provided on the back surface of each of the left and right film edges is set to be larger than the separation distance in the film thickness direction between the lowermost end of the back surfaces of the left and right film edges and the back surface of the film body. Thereby, even when the radius of curvature of the left and right edges differs depending on the portable terminal, the difference in the radius of curvature can be absorbed by the thickness of the adhesive layer, and the left and right film edges can be reliably placed at the bending start portions of the left and right edges. Can be sticky.

  According to the present invention, the curved surface is formed so as to be convex upward so that the back surface is located lower as approaching the end so as to be along the surface of the curved start portion where the curved left and right edges of the display screen start. By providing the left and right film edges, it is possible to provide a transparent film for a portable terminal that can cover the display screen as much as possible, but can be mounted so as not to be floated from the curved start portion of the left and right edges of the display screen. it can.

It is a perspective view of a portable terminal. (A) is a view from the front and rear showing a state immediately before the transparent film for a portable terminal is adhered to the display screen of the portable terminal, and (b) is a state where the transparent film for a portable terminal is adhered to the display screen of the portable terminal. FIG. It is sectional drawing which shows the state which adhered the conventional transparent film for mobile terminals to the display screen of the mobile terminal.

  Hereinafter, the transparent film for mobile terminals of the present invention will be described. As shown in FIG. 1, the transparent film 1 for a mobile terminal is disposed so as to cover a display screen 3 of a mobile terminal (for example, iPhone (registered trademark)) 2. In FIG. 1, the horizontal direction and the front-back direction of the mobile terminal 2 are set, and the set directions will be described below.

  The mobile terminal 2 includes a main body 4 having a rectangular casing containing various substrates, a camera lens, a battery, and the like, and the display screen 3 arranged on the main body 4 and having a substantially planar upper surface and a rectangular shape. Have. Note that the radius of curvature of the main body 4 and the radius of curvature of the display screen 3 are made substantially the same so that a step does not occur at the boundary between the left and right ends of the main body 4 and the display screen 3.

  The display screen 3 also serves as a touch panel, and as shown in FIGS. 1 and 2A and 2B, a screen main body 3A having a substantially planar upper surface and a rectangular shape in a plan view, and a screen main body 3A. The main body 3A has a curved surface 3b extending outwardly in the left-right direction from each of the left and right ends thereof and projecting upward so as to be located lower toward the end, and protrudes upward in the thickness direction of the main body 4. Left and right edges 3B, 3B (only the left side is shown in FIG. 1 and only the right side is shown in FIGS. 2 (a) and 2 (b)). The radius of curvature of the curved surface 3b often differs for each manufacturer of the mobile terminal 2 or for each model of the mobile terminal 2.

  The transparent film 1 for a portable terminal is made of, for example, tempered glass, and has a film main body 1A whose front and rear surfaces are formed in a substantially planar shape, and left and right film edges extending outward from the left and right ends of the film main body 1A in the left and right direction. Parts 1B, 1B. The left and right film edges 1B, 1B cover only the bending start portions 3C, 3C (the portion between the broken lines in FIG. 2A) where the bending of the left and right edges 3B, 3B of the display screen 3 is started, and the bending start portion 3C. , 3C is formed on a curved surface that is upwardly convex so that the rear surfaces 1R, 1R are located lower as they approach the ends.

  The curved surfaces of the curved start portions 3C, 3C of the curved surfaces are formed into gentle curved surfaces close to straight lines, and the back surfaces 1R, 1R of the left and right film edges 1B, 1B covering these curved start portions 3C, 3C are also formed. It is formed on a gently curved surface that is close to a straight line (a curved surface substantially the same as the curved surfaces of the bending start portions 3C, 3C). By forming the back surfaces 1R, 1R of the left and right film edges 1B, 1B as gently curved surfaces close to straight lines in this manner, the back surface 1a of the film body 1A and the back surfaces 1R, 1R of the left and right film edges 1B, 1B are described later. There is also an advantage that the adhesive layer 5 is easily applied. In other words, the degree of curvature of the curved surfaces of the curved start portions 3C, 3C is smaller than the degree of curvature of the curved surfaces of the other portions located on the outer side in the left-right direction with respect to the curved start portions 3C, 3C. It has a curved surface.

  In addition, the surfaces of the left and right film edges 1B, 1B are formed as curved surfaces that are convex upward and are located lower as they approach the outer ends in the left-right direction. Since the degree of curvature of the curved surface on the front surface is set to be greater than the degree of curvature of the curved surface on the back surface, the upper and lower thicknesses of the left and right film edges 1B, 1B are tapered toward the outer end in the left-right direction. However, the degree of curvature of the curved surface on the front surface may be set to be substantially the same as the degree of curvature of the curved surface on the back surface, so that any portion has the same thickness.

  An adhesive layer 5 is provided on each of the back surface (lower surface) 1a of the film main body 1A and the back surfaces (lower surface) 1R, 1R of the left and right film edges 1B, 1B. The adhesive layer 5 is made of at least one of a silicone resin, a urethane resin, and an acrylic resin.

  The thickness (the distance from the back surface 1R of the left and right film edges 1B to the back surface 5R of the adhesive layer 5) of the adhesive layers 5 provided on the left and right film edges 1B, 1B is determined by the thickness of the back surfaces 1R, 1R of the left and right film edges 1B, 1B. Is larger than the distance L (see FIG. 2B) in the film thickness direction between the lowermost end 1C of the film main body 1A and the back surface 1a of the film main body 1A. Therefore, even when the curvature radii of the left and right edges 3B, 3B differ depending on the portable terminal 2, the difference in the curvature radii can be absorbed by the thickness of the adhesive layer 5, and the left and right film edges 1B, 1B are separated from each other. It is possible to securely adhere to the bending start portions 3C, 3C of the portions 3B, 3B. The thickness of the adhesive layer 5 is substantially the same as the thickness of the portion applied to the film body 1A and the thickness of the portions applied to the left and right film edges 1B, 1B.

  The thickness of the adhesive layer 5 provided on the entire back surface of the transparent film 1 for mobile terminals, that is, the thickness of the adhesive layer 5 provided on the back surface 1a of the film main body 1A and the back surfaces 1R and 1R of the left and right film edges 1B and 1B, The distance L (see FIG. 2B) in the film thickness direction between the lowermost end 1C of the rear surfaces 1R and 1R of the edges 1B and 1B and the rear surface 1a of the film main body 1A is set larger. In other words, the back surface 5A of the adhesive layer 5 provided on the back surface 1a of the film main body 1A and the back surfaces 5R, 5R of the adhesive layer 5 provided on the back surfaces 1R, 1R of the left and right film edges 1B, 1B are combined with the left and right film edges 1B, 1B. Projecting toward the display screen 3 so as to be located below the lowermost end 1C of the rear surfaces 1R and 1R of the display device. Therefore, even when the transparent film for mobile terminal 1 is displaced with respect to the display screen 3 and the left and right film edges 1B, 1B are attached to the screen main body 3A having a substantially planar shape, the curved left and right film edges 1B, 1B. Can be securely adhered to the screen main body 3A by the thickness of the adhesive layer 5.

  The radius of curvature of the left and right edges 3B, 3B is set to be equal to or less than 1/3 of the total length of the left and right edges 3B in the left-right direction of each of the bending start portions 3C. 2 is different, it is preferable that the curving start portions 3C can cover the back surfaces 1R, 1R of the left and right film edges 1B, 1B without being peeled off by the adhesive layer 5, but it is preferable. The length may exceed / 3 and may be equal to or less than half of each left and right edge 3B.

  Specifically, the separation distance L in the film thickness direction from the back surface 1a of the film main body 1A to the lowermost ends 1C, 1C of the left and right film edges 1B, 1B is an arbitrary value in the range of 0.01 mm to 0.05 mm. On the other hand, the thickness (the dimension in the vertical direction) of the adhesive layer 5 is an arbitrary value in the range of 0.18 mm to 0.25 mm. In addition, the thickness of the film main body 1A is 0.33 mm here, but may be another numerical value.

  When the film main body 1A and the left and right film edges 1B, 1B configured as described above are pressed against the display screen 3, the film main body 1A is brought into contact with the display screen 3 with the adhesive layer 5 provided at least on the back surface 1a of the film main body 1A. Sticky. At this time, the left and right film edges 1B, 1B cover the bending start portions 3C, 3C along the bending start portions 3C, 3C of the left and right edges 3B, 3B of the display screen 3. In addition, since the left and right film edges 1B, 1B cover only the bending start portions 3C, 3C where the bending of the left and right edges 3B, 3B starts, the radius of curvature of the left and right edges 3B, 3B depends on the portable terminal. Even in a different case, the distance in the film thickness direction from the bending start point of the curved surface in the bending start portions 3C, 3C to the bending end point (end) on the outer side in the left-right direction can be suppressed to be small. The left and right edges 3B, 3B do not float from the bending start portions 3C, 3C. Therefore, not only the screen main body 3A of the display screen 3 but also the curved start portions 3C, 3C of the left and right edges 3B, 3B can be covered with the transparent film 1 for a portable terminal well.

  Examples of a method for forming the transparent film 1 for a mobile terminal include a method in which a glass plate is ground using a grinder, a method in which molten glass is placed in a mold, and the like.

  Note that the present invention is not limited to the above-described embodiment, and various changes can be made without departing from the gist of the present invention.

  For example, the mobile terminal to which the transparent film for a mobile terminal is attached may be Android (registered trademark), Android (registered trademark), iPad (registered trademark), or iPod (registered trademark) in addition to iPhone (registered trademark).

  Further, in the above-described embodiment, the transparent film for mobile terminal 1 is made of tempered glass, but may be made of a hard synthetic resin.

  In the above embodiment, the adhesive layer 5 is provided on the back surface 1a of the film main body 1A of the transparent film 1 for portable terminals and the back surfaces 1R, 1R of the left and right film edges 1B, 1B, but only on the back surface 1a of the film main body 1A. It can also be implemented with an adhesive layer 5.

  In the above embodiment, the thickness of the adhesive layer 5 provided on the entire back surface of the transparent film 1 for a mobile terminal, that is, the thickness of the adhesive layer 5 provided on the back surface 1a of the film body 1A and the back surfaces 1R, 1R of the left and right film edges 1B, 1B. Although the thickness is larger than the separation distance L (see FIG. 2B) in the film thickness direction between the lowermost end 1C of the rear surfaces 1R, 1R of the left and right film edges 1B, 1B and the rear surface 1a of the film body 1A. Only the thickness of the adhesive layer 5 provided on the back surfaces 1R, 1R of the left and right film edges 1B, 1B is determined by determining the thickness between the lowermost end 1C of the back surfaces 1R, 1R of the left and right film edges 1B, 1B and the back surface 1a of the film body 1A. It may be larger than the separation distance L in the film thickness direction (see FIG. 2B).

  DESCRIPTION OF SYMBOLS 1 ... Transparent film for portable terminals, 1A ... Film body, 1B ... Left and right film edges, 1C ... Bottom edge, 1R ... Backside, 1a ... Backside ... 2 ... Portable terminal, 3 ... Display screen, 3A ... Screen body, 3B ... Left and right edges, 3C: curved start portion, 3b: curved surface, 4: body, 5: adhesive layer, 5A: back surface, 5R: back surface, 10: transparent film for portable terminal, 11: tempered glass film, 11B: left and right ends Part, 12: adhesive layer, 13: PET layer, 14: adhesive layer, L: separation distance

Claims (2)

A main body, and a display screen disposed on the main body, wherein the display screen is configured such that an upper surface thereof has a substantially planar shape, and a left and right end of each of the left and right ends of the screen main body. The display screen is displayed on a mobile terminal including a curved surface that is extended and has a curved surface that is convex upward so as to be positioned lower toward the end, and has left and right edges that protrude in the thickness direction of the main body. A transparent film for a mobile terminal placed on the display screen to protect,
A film main body having a rear surface configured in a substantially planar shape and covering the screen main body, and left and right film edges extending outward from the left and right ends of the film main body in the left and right direction,
At least an adhesive layer for adhering the film main body to the screen main body is provided on the back surface of the film main body,
The left and right film edges cover the bending start portion where the bending of the left and right edges of the display screen starts, and project upward so that the back surface is located lower toward the end so as to follow the surface of the bending start portion. A transparent film for a portable terminal, wherein the transparent film is formed on a curved surface.   The adhesive layer is provided on the back surface of each of the left and right film edges, and the thickness of the adhesive layer is greater than the separation distance in the film thickness direction between the lowermost end of the back surfaces of the left and right film edges and the back surface of the film body. The transparent film for a portable terminal according to claim 1, wherein the transparent film is large.