JP2012019064A - Method for sticking flexible substrate - Google Patents

Abstract

The present invention relates to a method for adhering a flexible substrate to an attachment member having a curved shape, and can attach the flexible substrate to an attachment portion having a curved shape without forming a slit. It aims at providing the sticking method of a flexible substrate.
In a method for attaching a flexible substrate to a member to be mounted 1 having a curved surface shape, a mold 20 corresponding to the curved surface shape of the member to be mounted 1 is used, and the flexible substrate 10a is made of gold. It has the molding process which shape | molds in the shape corresponding to the said curved surface shape with the type | mold 20, and the sticking process which sticks the flexible substrate 10 shape | molded in the shape corresponding to a curved surface shape to the to-be-attached member 1. FIG.
[Selection] Figure 4

Description

  The present invention relates to a method for attaching a flexible substrate, and more particularly to a method for attaching a flexible substrate in which a flexible substrate is attached to a member to be mounted having a curved shape.

  As is well known, a mobile terminal device such as a mobile phone has an antenna for performing communication. In addition, as mobile terminal devices have higher functions, there are also provided ones in which a plurality of antennas are housed and arranged inside a mobile phone.

  On the other hand, since a mobile terminal device is carried by a user, there is a strong demand for size reduction, thickness reduction, and design improvement. For these reasons, in recent years, the configuration in which the antenna is arranged inside the casing of the mobile terminal device has increased (see Patent Document 1).

  Thus, when arrange | positioning an antenna inside the housing | casing of a portable terminal device, it attaches by forming an antenna pattern in a flexible substrate and sticking this in the housing | casing of a portable terminal device (patent document). 2).

JP 2008-117944 A JP 2005-348066 A

  As described above, improvement in design is desired for mobile terminal devices, and some cases have a complicated shape with many curved surfaces. When trying to stick a flexible board with an antenna pattern formed on a housing with such a complex shape, the flexible board is sheet-like, so wrinkles occur when it is stuck, and the antenna pattern is in the proper shape. There is a possibility of deformation from.

  As a method for avoiding this, it is also conceivable to form a slit in the flexible substrate so that the shape of the flexible substrate at the time of sticking corresponds to the housing shape. However, in this correspondence, since a slit is formed in the flexible substrate, an antenna pattern cannot be formed at the slit forming position. Therefore, there is a problem that the degree of freedom in designing the antenna pattern is low, and when the antenna pattern is formed while avoiding the slit, the flexible substrate becomes large.

  The present invention has been made in view of the above points, and provides a method for attaching a flexible substrate capable of adhering a flexible substrate to an attachment portion having a complicated curved surface shape without forming a slit. Objective.

From the first point of view, the above problem is
In the attaching method of the flexible substrate for adhering the flexible substrate to the mounted member having a curved surface shape,
Using a mold corresponding to the curved surface shape of the mounted member, and molding the flexible substrate into a shape corresponding to the curved surface shape by the mold;
It can be solved by a flexible substrate sticking method comprising a sticking step of sticking the flexible substrate molded into a shape corresponding to the curved surface shape to the member to be attached.

  In the above invention, it is desirable that the flexible substrate is heated and pressed in the molding step.

  Moreover, in the said invention, it is desirable to stick the said flexible substrate shape | molded at the said sticking process to the said to-be-attached member using a double-sided tape.

  In the above invention, the mounted member may be a mobile terminal device, and an antenna of the mobile terminal device may be formed on the flexible substrate.

  According to the disclosed flexible substrate attaching method, the flexible substrate is formed into a shape corresponding to the curved shape of the attached member using a mold, and then attached to the attached member. A flexible substrate can be attached along the shape.

FIG. 1 is a diagram showing a flexible substrate attached using the flexible substrate attaching method according to an embodiment of the present invention. FIG. 2 is a view for explaining a mold used for the flexible substrate attaching method according to the embodiment of the present invention. FIG. 3 is a view for explaining a flexible substrate sticking method according to an embodiment of the present invention (part 1). FIG. 4 is a view for explaining a flexible substrate sticking method according to an embodiment of the present invention (part 2).

  Next, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a state where a flexible substrate 10 is attached to a member 1 to be attached using the flexible substrate attaching method according to an embodiment of the present invention. The mounted member 1 is a housing of a mobile terminal device, for example. The flexible substrate 10 is formed with an antenna pattern and functions as an antenna of the mobile terminal device.

  In the following description, for convenience of explanation and illustration, the mounted member 1 having the shape shown in FIG. 1 is a part of a casing constituting a mobile terminal device such as a mobile phone. On the other hand, a method for mounting the flexible substrate 10 will be described.

  The mounted member 1 is a resin molded body such as ABS resin, for example, and a curved surface portion 2 is formed on an upper surface portion thereof. The curved surface portion 2 is not a surface having a uniform curvature but a three-dimensionally complicated curved surface shape. This curved surface shape is set, for example, from the design surface of the casing of the mobile terminal device.

  The material of the mounted member 1 is not limited to resin, and materials such as metal and rubber can be used. In order to improve the antenna characteristics, a high dielectric resin or the like can be used instead of the ABS resin.

  As shown in FIG. 1, the flexible substrate 10 has the same shape as the curved surface portion 2 of the mounted member 1 and is adhered to the curved surface portion 2 using an adhesive member (for example, a double-sided adhesive tape). . In the attaching method according to the present embodiment, the flexible substrate 10 is formed in the same shape as the curved surface portion 2 of the mounted member 1 and then attached to the curved surface portion 2. Therefore, even if the flexible substrate 10 is adhered to the mounted member 1 having the curved surface portion 2, wrinkles do not occur in the flexible substrate 10 (the reason will be described later).

  FIG. 2 shows a mold 20 used in the sticking method according to an embodiment of the present invention. The mold 20 includes a female mold 21 and a male mold 25. The female die 21 has a main body 22 having a rectangular parallelepiped shape and a cavity 23 (concave portion) formed in the main body 22. In addition, a convex part 24 having a convex shape corresponding to the curved surface part 2 of the mounted member 1 is formed inside the cavity 23.

  The male mold 25 has a shape corresponding to the cavity 23 formed in the female mold 21. That is, the male mold 25 can be inserted into the cavity 23. Further, a concave portion 27 having a concave shape corresponding to the curved surface portion 2 of the mounted member 1 is formed at the distal end portion (lower portion in the drawing) of the male die 25. Therefore, when the male mold 25 is attached to the female mold 21, the mold portion 24 and the mold portion 27 are in close contact with each other.

  Next, with reference to FIG. 3 and FIG. 4, a description will be given of a sticking method for sticking the flexible substrate 10 to the mounted member 1 using the mold 20 (female die 21, male die 25) configured as described above. To do.

  In order to attach the flexible substrate 10 to the mounted member 1, first, as shown in FIG. 3A, a sheet-like flexible substrate in which no bending occurs on the upper surface of the female mold 21 (no bending occurs). A flexible substrate in a state is particularly attached as a flexible substrate 10a).

  An antenna pattern is formed on the flexible substrate 10a. As will be described later, when the flexible substrate 10a is formed into a formation corresponding to the mounted member 1, this antenna pattern is also deformed. However, the antenna pattern formed on the flexible board 10a is designed so that an antenna pattern having a predetermined shape is formed after the flexible board 10a is molded.

  When the flexible substrate 10a is attached to the female die 21, the surface of the female die 21 is heated to 100 ° to 160 ° by a heating device (not shown) (Note that this heat treatment is performed in advance from before the flexible substrate 10a is attached. You may want to keep it). FIG. 3B shows a state in which the female mold 21 is heated and the male mold 25 is disposed on the upper part thereof. In this state, the male mold 25 is in a state of facing the flexible substrate 10a.

  Next, the male mold 25 is moved downward toward the female mold 21 using a pressure device (not shown), and the male mold 25 is inserted into the cavity 23 of the female mold 21. FIG. 3C shows a state where the male mold 25 is inserted into the female mold 21.

  In this state, the flexible substrate 10 a is sandwiched between the mold part 24 of the female mold 21 and the mold part 27 of the male mold 25. At this time, a load of 10 kgf to 100 kgf is applied to the flexible substrate 10a by a pressurizing device. This pressurization and heat treatment are performed, for example, for 30 seconds to 60 seconds. Thus, the flexible substrate 10a is molded into a shape corresponding to the shape of the mold part 24 and the mold part 27 by simultaneously performing the heat treatment and the pressure treatment by the mold 20 (the above process is referred to as a molding step). ).

  As described above, the mold part 24 and the mold part 27 have a shape corresponding to the curved surface part 2 of the mounted member 1. For this reason, the flexible substrate 10 a is molded by the mold 20, so that the flexible substrate 10 a is molded into a shape corresponding to the curved surface portion 2 of the mounted member 1. At this time, since the flexible substrate 10a is molded while being subjected to pressurization and heat treatment, wrinkles and slack do not occur on the surface thereof.

  When the molding process is finished, the male mold 25 is raised with respect to the female mold 21, and the molded flexible substrate 10 is released from the mold 20 as shown in FIG.

  A double-sided adhesive tape is disposed on the back side of the flexible substrate 10 taken out from the mold 20 (the side to be attached to the mounted member 1). In addition, what is arrange | positioned in the back side of the flexible substrate 10 in this case is not limited to a double-sided adhesive tape, Other members will be sufficient if the flexible substrate 10 is affixed to the to-be-attached member 1. (For example, an adhesive) may be used.

  Next, as shown in FIG. 4E, the flexible substrate 10 on which the double-sided tape is disposed is mounted on the curved surface portion 2 of the mounted member 1. Under the present circumstances, you may implement a heat processing and a pressurization process according to the kind of adhesive agent and a double-sided tape.

  Thereby, as shown to FIG. 4 (F), the flexible substrate 10 is affixed on the curved surface part 2 of the to-be-attached member 1 (the above process is called adhesion process). As described above, the flexible substrate 10 has a shape corresponding to the curved surface shape of the curved surface portion 2 of the mounted member 1 in the molding process. Moreover, the flexible substrate 10 has a smooth shape without wrinkles or slack on the surface during molding.

  Therefore, even if the curved surface portion 2 of the mounted member 1 has a complicated curved surface shape, when the flexible substrate 10 is bonded to the curved surface portion 2 of the mounted member 1, wrinkles, slack, etc. Will not occur. Further, the antenna pattern formed on the flexible substrate 10 is not deformed from a predetermined shape in the attaching process.

  Moreover, in the sticking method by this embodiment, it is not necessary to form a slit in a flexible substrate like the past. For this reason, when setting an antenna pattern on the flexible substrate 10, it becomes unnecessary to set the pattern avoiding the slit formation position as in the conventional case, and the degree of freedom in designing the antenna pattern on the flexible substrate 10 can be increased.

  Furthermore, since the flexible substrate 10a is molded using the mold 20, the sticking method according to the present embodiment can perform the molding process of the flexible substrate 10a with high productivity. In addition, since the flexible substrate 10 is already in a state after molding at the time of sticking to the mounted member 1, it can be mounted so that the flexible substrate 10 can be put on the mounted member 1 at the time of sticking. Wearing workability can be improved.

  The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific embodiments described above, and various modifications are possible within the scope of the gist of the present invention described in the claims. It can be modified and changed.

DESCRIPTION OF SYMBOLS 1 Mounted member 2 Curved surface part 10, 10a Flexible substrate 20 Mold 21 Female mold 23 Cavity 24 Convex part 25 Male part 27 Concave part

Claims (4)

In the attaching method of the flexible substrate for adhering the flexible substrate to the mounted member having a curved surface shape,
Using a mold corresponding to the curved surface shape of the mounted member, and molding the flexible substrate into a shape corresponding to the curved surface shape by the mold;
A bonding step of bonding the flexible substrate molded into a shape corresponding to the curved surface shape to the mounted member.   The method for adhering a flexible substrate according to claim 1, wherein in the molding step, the flexible substrate is molded while being heated and pressed.   The method for attaching a flexible substrate according to claim 1 or 2, wherein in the attaching step, the molded flexible substrate is attached to the mounted member using a double-sided tape. The attachment of the flexible substrate according to any one of claims 1 to 3, wherein the mounted member is a mobile terminal device, and an antenna of the mobile terminal device is formed on the flexible substrate. Method.

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