JP5477103B2 - Mobile terminal device and method for manufacturing mobile terminal device - Google Patents

Description

  The present invention relates to a mobile terminal device and a method for manufacturing a mobile terminal device.

  2. Description of the Related Art Conventionally, in mobile terminal devices such as mobile phones, as one aspect for realizing miniaturization and high strength, an insert product such as a sheet metal is placed in a mold, and molten resin or the like is poured into the mold. A composite part by insert molding in which the resin is integrated is used. In other words, since it is difficult to reduce the size of a portable terminal device when only resin is used, it is possible to reduce the size while maintaining strength by using a composite part in which sheet metal and resin are insert-molded. Yes.

  Here, the structure of the portable terminal device according to the prior art will be described with reference to FIGS. 5A and 5B. FIG. 5A is a diagram illustrating a cross-section of a mobile terminal device according to the related art, and FIG. 5B is an enlarged diagram illustrating a circular portion illustrated in FIG. 5A. 5A and 5B exemplify a folding portable terminal device.

  For example, as illustrated in FIG. 5A, the mobile terminal device 1 includes a fixed housing 10 and a movable housing 20. The fixed housing 10 includes, for example, various operation keys such as a numeric keypad, a mouthpiece in which a microphone or the like is disposed, a battery case, and the like. The movable housing 20 includes, for example, a liquid crystal display device such as an LCD (Liquid Crystal Display) module, an LCD panel for visually confirming the liquid crystal display device, and the like.

  For example, as shown in FIG. 5B, the movable housing 20 includes an LCD panel 21, a double-sided tape 22, an insert metal plate 23, a resin case 24, a dustproof cushion 25, an LCD module 26, and the like. The LCD panel 21 is a display device using liquid crystal, for example. The double-sided tape 22 is, for example, an adhesive tape that bonds the LCD panel 21 and the insert sheet metal 23.

  The insert sheet metal 23 is, for example, a sheet metal for insert molding, and is integrated with the resin case 24. The resin case 24 is, for example, a resin injected during insert molding, and is integrated with the insert sheet metal 23. The dustproof cushion 25 is, for example, a cushioning material between the insert metal plate 23 and the LCD module 26 while preventing dust contained in the movable housing 20 and fine dust on the substrate from entering the LCD panel 21. . The LCD module 26 is, for example, a liquid crystal display device for causing the LCD panel 21 to display and output.

  With the above configuration, in the mobile terminal device 1, the LCD panel 21 and the LCD module 26 are arranged via the insert metal plate 23, thereby suppressing the sticking of the LCD panel 21 and realizing miniaturization and high strength. doing. Some recent portable terminal devices use composite parts by insert molding and have various water stop structures using double-sided tape.

JP 2008-106932 A JP 2009-105610 A JP 2009-239670 A JP 2008-181366 A

  However, the conventional technique has a problem that water enters the inside of the casing of the mobile terminal device. Specifically, in the related art in which different members of sheet metal and resin are combined, there is a possibility that water may enter through the gaps between the different members as indicated by the dotted arrows in FIG. 5B.

  Therefore, the technology disclosed in the present application has been made in view of the above, and the manufacture of a mobile terminal device and a mobile terminal device capable of preventing water from entering the housing of the mobile terminal device It aims to provide a method.

  In order to solve the above-described problems and achieve the object, a mobile terminal device disclosed in the present application includes a sheet metal for insert molding that supports a display unit and maintains a distance between the display unit and a part in the housing. The portable terminal device is a case that covers a predetermined part of the housing, and has a resin case that is integrated with the sheet metal by insert molding. Further, the portable terminal device has a double-sided tape containing a thermally active adhesive bonded to a predetermined position of the interface between the sheet metal and the resin case.

  One aspect of the mobile terminal device and the manufacturing method of the mobile terminal device disclosed in the present application has an effect that water can be prevented from entering the housing of the mobile terminal device.

FIG. 1 is an external perspective view showing a mobile phone according to the present embodiment. FIG. 2A is an exploded perspective view showing an insert sheet metal included in the water stop structure of the mobile phone according to the present embodiment. FIG. 2B is an exploded perspective view showing a thermally activated tape included in the water stop structure of the mobile phone according to the present embodiment. FIG. 2C is an exploded perspective view showing a resin case included in the water stop structure of the mobile phone according to the present embodiment. FIG. 2D is a perspective view illustrating a completed state of the water stop structure formed by insert molding of the mobile phone according to the present embodiment. FIG. 2E is a diagram showing a bonding range of the thermally active tape of the mobile phone according to the present embodiment. FIG. 3A is an external perspective view showing a non-slidable mobile phone according to the present embodiment. FIG. 3B is a diagram showing a cross section taken along line XX shown in FIG. 3A. FIG. 3C is an enlarged view of the circular portion shown in FIG. 3B. FIG. 4 is a flowchart showing an example of the manufacturing process of the mobile phone according to the present embodiment. FIG. 5A is a diagram illustrating a cross-section of a mobile terminal device according to the related art. FIG. 5B is an enlarged view of the circular portion shown in FIG. 5A.

  Embodiments of a mobile terminal device and a method for manufacturing the mobile terminal device disclosed in the present application will be described below with reference to the accompanying drawings. In addition, this invention is not limited by the following examples. For example, in the following embodiment, an example in which the mobile terminal device disclosed in the present application is applied to a mobile phone will be described. However, the mobile terminal device disclosed in the present application may be applied to other mobile terminal devices such as a PDA (Personal Digital Assistant). Can be applied.

[Appearance structure of mobile phone]
The external configuration of the mobile phone according to the present embodiment will be described with reference to FIG. FIG. 1 is an external perspective view showing a mobile phone according to the present embodiment. The mobile phone 100 according to the present embodiment includes, for example, two palm-sized casings 110 and 120. These two cases 110 and 120 are slidably connected via a connecting part such as a slide mechanism. That is, FIG. 1 shows a state in which the movable housing 120 is opened with respect to the fixed housing 110 by sliding the movable housing 120 relative to the fixed housing 110.

  The housing 110 includes, for example, various operation keys 111 and the like, and includes a front exterior case 112 positioned on the operation key 111 side which is an inner surface and a rear exterior case 113 positioned on the back side which is an outer surface. Split structure. The housing 120 includes, for example, a transmitter 121, a receiver 122, an LCD panel 123, and the like, and includes a front exterior case 124 that is positioned on the LCD panel 123 side that is the outer surface and a rear exterior that is positioned on the rear side that is the inner surface. This is a two-part structure with the case 125.

[Water stop structure]
Next, the water stop structure of the mobile phone 100 according to the present embodiment will be described with reference to FIGS. 2A to 2E. The water stop structure is a detailed configuration of the front exterior case 124. FIG. 2A is an exploded perspective view showing an insert sheet metal included in the water stop structure of the mobile phone 100 according to the present embodiment. FIG. 2B is an exploded perspective view showing a thermally activated tape included in the water stop structure of the mobile phone 100 according to the present embodiment. FIG. 2C is an exploded perspective view illustrating a resin case included in the water stop structure of the mobile phone 100 according to the present embodiment. FIG. 2D is a perspective view illustrating a completed state of the water stop structure formed by insert molding of the mobile phone 100 according to the present embodiment. FIG. 2E is a diagram illustrating a bonding range of the thermally active tape of the mobile phone 100 according to the present embodiment.

  The water stop structure of the cellular phone 100 according to the present embodiment uses a composite part formed by insert molding of sheet metal and resin, and a heat activated tape that is a double-sided tape containing a heat activated adhesive. More specifically, the water stop structure of the mobile phone 100 according to the present embodiment has the thermally active tape shown in FIG. 2B at the interface between the insert sheet metal shown in FIG. 2A and the resin case shown in FIG. 2C. In the insert molding of the mobile phone 100 according to the present embodiment, for example, a thermally activated tape is bonded to the insert sheet metal and heated, and the resin is injected into a mold in which the insert sheet metal is placed. Thereby, as shown in FIG. 2D, a front exterior case 124 is obtained as a completed state of insert molding. In addition, as shown to FIG. 2E, the range (shaded part) which covers the outer side of insert sheet metal is preferable as the adhesion range of a thermoactive tape.

  In insert molding, for example, when the thermally activated tape is activated at about 100 ° C. to 300 ° C., the insert metal plate and the thermally activated tape are heated at about 180 ° C. and temporarily bonded to each other, and are about 280 ° C. It is preferable to inject a resin. Thereby, at the time of insert molding of the insert sheet metal and the resin, the thermally active tape bonded to the insert sheet metal is bonded to the resin by heat at the time of resin injection.

  That is, in the insert molding, considering the activity rate of the thermally activated tape, the activity rate is set to about 50% at the time of temporary bonding with the insert metal plate, and the heat rate is set to be around 100% at the time of resin injection. The active tape is completely cured. In other words, if the heating temperature at the time of temporary bonding with the insert sheet metal is 300 ° C., the activity rate becomes 100%, and the thermally active tape is completely cured. The temperature is set so that the activity rate at the time of resin injection is higher than the rate.

[Cross section of still water structure]
Next, the cross section of the water stop structure of the mobile phone 100 according to the present embodiment will be described using FIGS. FIG. 3A is an external perspective view showing the non-slidable mobile phone 100 according to the present embodiment. FIG. 3B is a diagram showing a cross section taken along line XX shown in FIG. 3A. FIG. 3C is an enlarged view of the circular portion shown in FIG. 3B.

  For example, as illustrated in FIGS. 3A and 3B, the mobile phone 100 includes a fixed-side casing 110 and a movable-side casing 120. Hereinafter, details will be described with reference to FIG. 3C in which the circular portion of FIG. 3B, which is a cross-sectional view of the cellular phone 100 shown in FIG. In addition, the dotted line arrow shown to FIG. 3C shows infiltration of water.

  For example, as shown in FIG. 3C, the housing 120 includes an LCD panel 124a, a touch panel tape 124b, an insert sheet metal 124c, a thermally activated tape 124d, a resin case 124e, a dustproof cushion 124f, an LCD module 124g, and the like. The housing 120 includes a substrate 124h, a rear case 124i, a water stop packing 124j, and the like.

  The LCD panel 124a is a display device such as a touch panel using liquid crystal, for example. The touch panel tape 124b is, for example, a double-sided tape that prevents water from entering from a gap between the LCD panel 124a and the insert sheet metal 124c, and bonds the LCD panel 124a and the insert sheet metal 124c. The insert sheet metal 124c is, for example, a sheet metal for insert molding, and is integrated with the thermal activation tape 124d, the resin case 124e, and the like. Such an insert sheet metal supports the LCD panel 124 a and maintains the distance between the LCD panel 124 a and each part in the housing 120.

  The thermally activated tape 124d is, for example, a double-sided tape that is adhered to a predetermined position on the interface between the insert metal plate 124c and the resin case 124e and contains a thermally activated adhesive. For example, the predetermined position is preferably a position parallel to the LCD panel 124a in the interface between the insert metal plate 124c and the resin case 124e. The reason why the thermally active tape 124d is arranged at a position parallel to the LCD panel 124a is that the insert sheet metal 124c only needs to be heated in one direction and only once. That is, when adhering the thermally active tape 124d at an arbitrary position, such as adhering the part in the vicinity of the transmitter 121 and receiver 122 in parallel with the LCD panel 124a and adhering the other part almost perpendicularly to the LCD panel 124a. Will require multiple heating and heating in multiple directions.

  The resin case 124e is, for example, a resin that is injected at the time of insert molding, and is integrated with the insert sheet metal 124c, the thermal activation tape 124d, and the like. The resin case 124e is a case that mainly covers the front surface of the housing 120. The dustproof cushion 124f is, for example, a cushioning material between the insert sheet metal 124c and the LCD module 124g while preventing fine dust or the like on the substrate 124h from entering the LCD panel 124a. The LCD module 124g is, for example, a liquid crystal display device for causing the LCD panel 124a to perform display output. The water stop packing 124j is, for example, a packing that prevents water from entering the inside of the housing of the rear case 124i. The LCD panel 124 a is the same as the LCD panel 123 described above, and the rear case 124 i is the same as or included in the rear exterior case 125.

[Mobile phone manufacturing process]
Next, the manufacturing process of the mobile phone 100 according to the present embodiment will be described with reference to FIG. FIG. 4 is a flowchart illustrating an example of a manufacturing process of the mobile phone 100 according to the present embodiment.

  For example, as shown in FIG. 4, in the manufacturing process of the mobile phone 100, a thermally activated tape is bonded to a predetermined position of the insert sheet metal (step S101), and the insert sheet metal is heated (step S102). In addition, when a thermally activated tape is what is activated at about 100 degreeC-300 degreeC, it is preferable that the heating temperature of insert sheet metal shall be about 180 degreeC at the time of temporary adhesion | attachment of a thermally activated tape.

  Then, in the manufacturing process of the mobile phone 100, the insert sheet metal to which the thermally activated tape is temporarily bonded is put into a mold (step S103), and the resin is injected into the mold (step S104). In addition, it is preferable to inject | pour resin with the temperature of about 280 degreeC. As a result, the thermally activated tape temporarily bonded by heating the insert sheet metal is bonded to the resin and completely cured by injection of the resin.

[Effects of Examples]
As described above, the mobile phone 100 has a water-stop structure in which the thermally active tape 124d is bonded to the interface between the insert sheet metal 124c for insert molding and the resin case 124e. Intrusion can be prevented. In addition, since the bonding position of the thermal activation tape 124d is parallel to the LCD panel 124a, the cellular phone 100 can be bonded in one direction to the insert sheet metal 124c and the thermal activation tape 124d, and is designed to save the appearance without deteriorating the appearance. Can be realized. Further, in the manufacturing process of the cellular phone 100, the heating temperature of the insert metal plate 124c and the temperature of the injected resin are set in consideration of the activity rate of the thermal activation tape 124d, so that the water stop structure can be provided without increasing the number of processes. Can be manufactured.

[Other embodiments]
The embodiments of the portable terminal device and the method of manufacturing the portable terminal device disclosed in the present application have been described so far, but may be implemented in various different forms other than the above-described embodiments.

  That is, in the present embodiment, the description has been given by taking as an example a slide type mobile phone using a slide mechanism that slidably connects the casing 110 and the casing 120, but the mobile terminal device disclosed in the present application is a slide type. The present invention can also be applied to other mobile terminal devices. For example, the mobile terminal device disclosed in the present application can be similarly applied to a mobile terminal device in which the other housing is movable with respect to one housing by a foldable or planar rotating connection portion.

  Moreover, although the present Example demonstrated the application example to the mobile telephone as a portable terminal device, the portable terminal device disclosed in this application is not limited to this. For example, the portable terminal device disclosed in the present application can be applied to other various portable terminal devices such as a small information processing terminal such as a PDA, a small music playback device, a portable television, and a portable game machine.

100 Mobile phone (mobile terminal device)
DESCRIPTION OF SYMBOLS 110 Housing | casing 111 Operation key 112 Front exterior case 113 Rear exterior case 120 Housing 121 Transmission section 122 Reception section 123, 124a LCD panel 124 Front exterior case 124b Touch panel tape 124c Insert sheet metal 124d Thermal activation tape 124e Resin case 124f Dustproof cushion 124g LCD module 124h Substrate 124i Rear case 124j Water-proof packing 125 Rear exterior case

Claims (4)

A resin case covering a predetermined part of the housing;
A sheet metal having an L-shaped longitudinal section including a substantially vertical plane and a substantially horizontal plane with respect to the flat surface of the casing, and both surfaces containing a thermally active adhesive in the resin case integrated with the sheet metal by insert molding A sheet metal for insert molding that supports the display unit at the substantially horizontal plane fixed to the support unit of the resin case via a tape and maintains the distance between the display unit and the part in the housing;
An end portion of an interface between the substantially vertical surface and the resin case at an extending base portion of the substantially vertical surface extending from one end side of the substantially horizontal surface toward an opposite side surface direction that is not a supporting side surface of the approximately horizontal surface that supports the display portion. , Connected to a substantially vertical gap existing between the display portion and the resin case that communicates from the inside of the housing to the outside of the housing,
The length in the height direction of the interface between the substantially vertical surface and the resin case with respect to the flat surface of the housing is the width direction of the interface between the substantially horizontal surface and the resin case with respect to the flat surface of the housing. A mobile terminal device characterized by being longer than the length. The portable terminal device according to claim 1, wherein the double-sided tape is bonded to a position parallel to the display unit in an interface between the sheet metal and the resin case. The sheet metal is bonded to the double-sided tape by being heated at a temperature at which the thermal activity rate of the double-sided tape becomes a predetermined thermal activity rate,
The mobile terminal device according to claim 1, wherein the resin case is insert-molded using a resin having a temperature higher than the predetermined thermal activity rate. A sheet metal having an L-shaped longitudinal section including a substantially vertical plane and a substantially horizontal plane with respect to a flat surface of the casing, and is thermally activated in a resin case that is integrated with the sheet metal by insert molding and covers a predetermined portion of the casing The display unit is supported by the substantially horizontal plane fixed to the support unit of the resin case via a double-sided tape containing an adhesive, and the distance between the display unit and the part in the housing is maintained, and the display unit An end portion of the interface between the substantially vertical surface and the resin case at the extending base portion of the substantially vertical surface extending from one end side of the substantially horizontal surface in a direction opposite to the side surface that is not the supporting side surface of the approximately horizontal surface that supports the housing. The height of the interface between the substantially vertical surface and the resin case with respect to the flat surface of the housing is connected to the substantially vertical gap existing between the display unit communicating from the body to the outside of the housing and the resin case. Direction A bonding step of length of, adhering the double-sided tape to a predetermined location of the long sheet metal than the length of the flat surface width direction relative to the housing of the interface between the substantially horizontal surface and said resin case,
A heating step of heating the sheet metal to which the double-sided tape has been bonded in the bonding step at a temperature that provides a predetermined thermal activity rate;
An insertion step of inserting the sheet metal heated by the heating step into a mold;
An injection step of injecting a resin having a temperature higher than the predetermined thermal activity rate into the mold into which the sheet metal has been inserted by the insertion step, and molding the resin case integrated with the sheet metal by insert molding. A method of manufacturing a mobile terminal device, comprising:

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