TWI567449B - A portable terminal, and a method of manufacturing the portable terminal - Google Patents

Description

Portable terminal and manufacturing method of the portable terminal

The present invention relates to a portable terminal having a cover covering a casing from a front side of a display unit, and to a method of manufacturing the portable terminal.

Heretofore, a cover system made of a transparent glass or an acrylic sheet for covering a display unit is bonded to a casing for accommodating a display unit by a double-sided tape or the like.

In recent years, there has been a demand for a portable terminal unit represented by a mobile phone, that is, to enlarge the display portion without increasing the size of the portable terminal itself. Moreover, it is required to have waterproof performance that will not be damaged even if the portable terminal is accidentally dropped into the water.

In the case where the portable terminal system has a rectangular plate shape having a large length in one direction, in order to maintain water repellency, particularly on both sides in the width direction of the portable terminal device, it is necessary to utilize both sides. The bonding area of the tape for bonding is maintained to a certain extent or more.

Then, it is conceivable to use a bonding method as disclosed in Patent Document 1, that is, a bonding member made of a thermosetting resin is heated by laser light to perform bonding.

[Patent Document]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2012-218316

However, the adhesive surface, that is, the back surface of the lid body and the front surface of the casing, have irregularities caused by sink marks during resin molding, precision of machining, and the like. For this reason, even if the usual method of attaching double-sided tape is used, the double-sided tape cannot be used tightly. Since it is joined to the uneven portion, sufficient waterproof performance cannot be ensured, and the reduced bonding area can be limited.

On the other hand, in the method of applying a liquid thermosetting resin described in Patent Document 1, there is a possibility that the coating cannot be reliably performed in a narrow region. Further, depending on the viscosity, the thermosetting resin may not sufficiently flow into the uneven portion. If there is a gap between the adhesive members due to the uneven portion, there is a possibility that the heat is abnormally generated during heating, and bubbles are generated in the adhesive member, and the water repellency is lowered.

The present invention has been made in view of the above problems, and an object thereof is to enlarge the display area of a display unit as much as possible, to suppress the size of the portable terminal itself, and to reliably adhere the cover to the casing.

In order to achieve the above object, in the invention, it is achieved that the cover member is pressed to bond the adhesive member to the uneven portion, and then heated by laser light.

Specifically, the present invention is based on a manufacturing method of a portable terminal device for manufacturing a portable terminal device, the portable terminal device having a display unit for accommodating the display unit a housing and a cover covering the housing from a front surface of the display unit.

The manufacturing method includes a clamping process, a pressurization process, and a bonding process. In the clamping process, the bonding member is sandwiched between the back surface of the cover and the housing, and the cover system transmits the laser light. In the pressurizing process, pressurization is performed in a state where the adhesive member is held, and the adhesive member is pressed between the back surface of the cover and the case. In the bonding process, the laser beam is irradiated from the front side of the lid body, and at least one of the heat generating portion provided on the back surface of the lid body and the heat generating portion formed on the front side of the lid body is heated. Thereby heating the bonding member to adhere the cover to the housing.

According to the manufacturing method described above, since the lid body is pressed toward the casing side, the gap between the uneven portion on the front surface of the lid body and the adhesive member can be reliably removed. In this state, the heat generating portion is heated by the laser light to melt the bonding member, thereby bonding the lid body and the casing. Thereby, the heat transfer bonding between the bonding member and the structural member is completed, and since the abnormal abnormal heating of the bonding member does not occur, the material does not foam and the water repellency can be easily ensured, thereby making it sticky. The connection width is narrow, and the high sealing property can be maintained, and the bonding area can be reduced as much as possible. The bonding member may be either a thermoplastic resin material or a thermosetting resin material, and may be either liquid or solid.

Further, when the adhesive member is previously formed into a shape corresponding to the adhesive portion, it is easier to use than the liquid, and the holding operation of the adhesive member becomes easy, even in the case where the adhesive region is narrow. Bonding reliably.

As described above, according to the present invention, when the lid body is pressed toward the casing side, the laser beam is irradiated to heat the heat generating portion, and the lid member is adhered to the casing by the bonding member, whereby It is possible to enlarge the display area of the display unit and to suppress the size of the portable terminal itself.

1‧‧‧Mobile (portable terminal)

2‧‧‧Display Department

2a‧‧‧ cover

2b‧‧‧ display unit

3‧‧‧Front side shell

3a‧‧‧Metal frame

3b‧‧‧Adhesive recess

4‧‧‧Back side shell

5‧‧‧Back cover

10‧‧‧Adhesive parts

11‧‧‧The Ministry of Heating

12‧‧‧ Pressurized fixture

Fig. 1 is an enlarged cross-sectional view showing a portion I of Fig. 4.

Fig. 2 is a perspective view showing the mobile phone.

Fig. 3 is an exploded perspective view showing the mobile phone.

Fig. 4 is an enlarged cross-sectional view taken along line IV-IV of Fig. 2 .

Hereinafter, embodiments of the present invention will be described based on the drawings.

1 to 4 show a mobile phone 1 as a portable terminal device according to an embodiment of the present invention. The mobile phone 1 is, for example, a rectangular plate-shaped smart phone having a large length in the up and down direction, and the mobile phone 1 is, for example, on the front side. The front side case 3 for accommodating the display unit 2 is provided on the side. The front side case 3 has a structure in which a rectangular disk-shaped metal frame 3a is joined to the front side case 3 by insert molding, and a height is continuously formed on the outer peripheral edge portion of the front side case 3. The first recessed recess 3b is adhered. The width of the concave portion 3b for bonding in the left-right direction The width of the adhesive recess 3b in the up-and-down direction is larger than the width in the left-right direction. Compared with the existing mobile phone, the width in the left and right direction is narrow, for example, about 0.5 to 1 mm. The material of the front side case 3 may be resin, metal, or the like, and is not particularly limited, but it is necessary to withstand heat generated by laser light.

As shown enlarged in FIG. 1, the back side case 4 is coupled to the back side of the front side case 3, and the back cover 5 covers the back side of the back side case 4. In addition, in FIG. 4, the circuit board and the rechargeable battery accommodated in the inside are abbreviate|omitted.

The display unit 2 has a lid body 2a made of a transparent glass plate. A touch panel (not shown) may be attached to the back side of the cover 2a, or the cover 2a itself may be a touch panel. A display unit 2b such as a liquid crystal display is attached to the back side of the lid body 2a. The lid body 2a may be made of a resin material that is transparent such as an acrylic sheet and that can be easily transmitted by laser light, but it is necessary to withstand heat generated by laser light.

In the present embodiment, black printing for shielding the outer side of the display area of the display unit 2b is formed on the back surface of the lid body 2a. This black printing does not transmit or reflect the laser light, but absorbs the laser light easily, and thus functions as the heat generating portion 11. Black printing is provided by attaching an ink containing a black dye or pigment to the back surface of the lid 2a. Black printing is necessary to withstand the heat caused by laser light. The black printed color may not be black, as long as it is capable of absorbing laser light. The heat generating portion 11 can also be provided by a method such as vapor deposition, film coating, or primer application.

The lid body 2a is adhered to the bonding recess 3b by the bonding member 10. The adhesive member 10 is formed by preliminarily forming a thermoplastic resin material which is melted by heating into a rectangular frame shape in accordance with the shape of the concave portion 3b for bonding. The thermoplastic resin material is not particularly limited, but it is necessary to use a material having the property of being easily bonded to any of the lid body 2a and the front side casing 3, and capable of being in the opposite body. 2a and the material of the front side casing 3 melt at a temperature which adversely affects.

Next, the procedure for attaching the lid body 2a of the present invention will be described.

First, in the preparation process, a cover 2a cut from a glass plate, a bonding member 10 formed by molding the concave portion 3b for bonding, a display unit 2b, a front side case 3, and the like are prepared.

Next, in the nip process, the bonding member 10 is sandwiched between the back surface of the lid body 2a and the front side casing 3. The adhesive member 10 is formed by preliminarily forming the shape of the recessed portion 3b for bonding, and the adhesive member 10 is attached to the adhesive member 10b, for example, as long as the adhesive member 10 is attached to the adhesive member. With the marked transparent separation film, the adhesive member 10 can be provided relatively easily on the adhesive recess 3b having a narrow width in the width direction.

Next, in the pressurizing process, pressurization is performed in a state where the bonding member 10 is sandwiched between the lid body 2a and the front side casing 3. The nip pressure may be, for example, 0.2 MPa to 2.5 MPa, preferably 0.3 MPa to 2.0 MPa. In order to avoid damaging the lid 2a, it is preferable to pressurize the lid 2a via the pressurizing jig 12. The pressurizing jig 12 is preferably made of an elastic material such as urethane or an elastomer which can be easily transmitted by laser light and has appropriate flexibility.

Next, in the bonding process, the laser light is irradiated from the front side of the lid body 2a. At this time, when the pressurizing jig 12 is made of a material that can be easily transmitted by the laser light, the heat generating portion 11 is heated by the laser light that has passed through the pressurizing jig 12. In this way, since the adhesive member 10 can be pressed directly above the adhesive member 10, even if the adhesive member 10 does not have liquid flowability, the gap can be removed more reliably to ensure waterproofness. In addition, if the heat generating portion 11 is not irradiated with the laser light via the pressurizing jig 12, the pressurizing jig 12 is not required to be made of a material that can transmit the laser light.

Here, the heat generating portion 11 which is provided on the back surface of the lid body 2a and which is composed of black printing which easily absorbs the laser light does not transmit or reflect the laser light, but mainly absorbs the laser light, whereby the heat generating portion 11 is heated. Then, the bonding member 10 is heated to soften, melt or solidify the bonding member 10, thereby bonding the lid 2a to the front side casing 3. The condition for heating may be, for example, such that the temperature of the bonding member 10 is 0.4 to 1.2 J, preferably 0.6 to 1.0 J, of 100 to 150 °C. It should be noted that, here, the energy J is calculated as follows: Assuming that the laser output power is W watts, the laser focus diameter is φ mm, and the scanning speed is Vmm/sec, then J = W × φ / V. In addition, if the temperature of the adhesive member 10 is 1.0 to 1.2 J of 150 to 170 ° C, even if it is appropriately pressurized, it is foamed and it is difficult to ensure waterproof. Sex. If the energy is less than 0.4 J, the heat generation temperature of the bonding member 10 is 80 ° C or less, and the bonding member 10 cannot be sufficiently softened, melted, or solidified.

As described above, since the lid body 2a is pressed toward the front side casing 3 side, the state of the gap between the uneven portion on the front surface of the front side casing 3 and the front surface of the front side casing 3 and the bonding member 10 can be removed. Next, the heat generating portion 11 is heated by the laser light to soften, melt or solidify the bonding member 10, thereby bonding the lid body 2a and the front side casing 3 together. Thereby, the heat transfer bonding between the bonding member 10 and the structural member is completed, and since the abnormal abnormal heating of the bonding member 10 does not occur, the material does not foam and the water repellency can be easily ensured. Can reduce the bonding area as much as possible.

In the present embodiment, the periphery of the lid body 2a is adhered to the peripheral edge portion of the front side casing 3 continuously by the bonding member 10 heated by the heat generation portion 11 of the lid body 2a, that is, the heat of the printing layer. Adhesive recess 3b. Since the adhesive member 10 can be heated by black printing or the like which is already present in the conventional portable terminal device for preventing the inside from being seen, the process for providing the heat generating portion 11 can be omitted.

Further, in a state in which the lid member 2a and the front side casing 3 are hermetically sealed by the bonding member 10, a circuit board, a rechargeable battery, or the like is incorporated, and the back side casing 4 is closed. Then, the cover 5 is covered to cover the waterproof mobile phone 1 .

As described above, in the present embodiment, even if the adhesive width is narrow, high airtightness can be maintained, whereby the adhesion by the adhesive member 10 can be reduced as much as possible while ensuring water repellency. The bonding area is used to manufacture a compact mobile phone 1 having a wide display area.

-Modifications -

In the above-described embodiment, the black printing printed on the back surface of the lid body 2a is used as the heat generating portion 11. However, the heat generating portion 11 may be continuously formed on the front surface of the adhesive recess portion 3b on the outer peripheral edge portion of the front side casing 3. A heat generating portion 11 that easily absorbs laser light is formed.

For example, the front side casing 3 itself can function as the heat generating portion 11 as long as the front side casing 3 itself is black or the like which easily absorbs the color of the laser light. If the color of the front side casing 3 itself is not easily absorbed by the color of the laser light, black printing may be formed on the front side casing 3, or black tape may be attached.

Then, in the bonding process, the laser beam is irradiated from the front side of the lid body 2a, and the heat generating portion 11 which is formed on the front surface of the front side casing 3 and which absorbs the laser light is heated, thereby heating the bonding member 10. The bonding member 10 is softened, melted or solidified, thereby bonding the lid body 2a to the front side casing 3, thus completing the bonding process.

According to the present modification, even when the heat generating portion 11 cannot be provided on the lid body 2a side, the heat generating portion 11 can be provided on the side of the adhesive recess portion 3b, and the front side case 3 can be heated to bond the bonding member 10. Soften, melt or cure.

(Other embodiments)

In the present invention, the above embodiment can be constructed in the following manner.

In other words, in the above-described embodiment, the heat generating portion provided in the black surface of the lid body 2a or the heat generating portion of the adhesive recess portion 3b is used as the heat generating portion 11. However, the heat generating portion on the back surface of the lid body 2a can be made to some extent When the laser beam is transmitted, the bonding member 10 can be heated by both the heat generating portion on the back surface of the lid body 2a and the heat generating portion 11 provided in the bonding recess portion 3b. Furthermore, the bonding member 10 itself may also contain a component that absorbs laser light.

Further, in the above-described embodiment, the frame member formed by molding the thermoplastic resin material in advance is used as the bonding member 10, whereby the bonding can be performed by a simple method such as a conventional double-sided tape. The highly viscous liquid bonding member 10 is applied to the bonding recess 3b by a dispenser or the like. In this case, even if it is in the form of a liquid, if the viscosity is high, it is difficult to bond the uneven portion on the surface. However, by the pressurization process, The bonding member 10 is sufficiently bonded to the uneven portion.

In addition, in the above embodiment, the mobile phone 1 is used as a portable terminal device, but the portable terminal device may also be a PHS (Personal Handy-phone System) or a PDA (Personal Digital Assistant). , smart phones, computers, portable devices, electronic dictionaries, desktop computers, game consoles, etc.

It should be noted that the above embodiments are merely preferred examples in nature, and are not intended to limit the scope of the invention, its application, or its scope of use. Further, the technical features described in the respective embodiments can be combined with each other, and new technical features can be formed by combining with each other.

2‧‧‧Display Department

2a‧‧‧ cover

2b‧‧‧ display unit

3‧‧‧Front side shell

3a‧‧‧Metal frame

3b‧‧‧Adhesive recess

4‧‧‧Back side shell

5‧‧‧Back cover

10‧‧‧Adhesive parts

11‧‧‧The Ministry of Heating

12‧‧‧ Pressurized fixture

Claims (5)

A manufacturing method of a portable terminal device for manufacturing a portable terminal device having a display unit, a housing for accommodating the display unit, and covering the shell from a front surface of the display unit a cover body of the body, wherein: the manufacturing method includes a clamping process, a pressurizing process, and a bonding process, in which the bonding member is clamped on the back surface of the cover body and the housing Between the cover system, the laser light is transmitted, and in the pressurizing process, in the state in which the bonding member is clamped, the cover is covered with a pressing jig including a material for transmitting the laser light. Pressing the body to press the bonding member between the back surface of the cover and the casing, and pressing the cover body with the pressing jig in the bonding process In a state, the laser beam is irradiated from the front side of the cover body, and the heat generating portion provided on the back surface of the cover body and the front side of the casing are heated by the laser light passing through the pressurizing jig. At least one of the heat generating portions, thereby heating the bonding member Stick to the cover on the housing. The manufacturing method of the portable terminal device according to claim 1, wherein in the clamping process, an adhesive member previously formed into a predetermined shape is clamped to a back surface of the cover body and the housing between. The manufacturing method of the portable terminal device according to claim 1 or 2, wherein the heat generating portion of the cover body is printed on a printed layer on the back surface of the cover body, and continuously formed in the case At least one of the front faces of the adhesive recesses on the outer peripheral edge portion, the periphery of the cover body being continuously formed in the case by the adhesive member heated by the heat generation of the heat generating portion The outer peripheral portion is bonded to the concave portion. A portable terminal device having a display unit and a cover covering the display unit And a housing formed with a recess for the cover for bonding, the cover being adhered to the recess for bonding the cover by an adhesive member, wherein the cover is made of a material that transmits laser light. a rear surface of the outer peripheral edge of the cover body corresponding to the recess portion corresponding to the cover body bonding recess, and an area covering at least the adhesive member on the outer side of the display unit, and the cover body is adhered At least one of the inner surfaces of the receiving recess is provided with a heat generating portion for absorbing the laser light, and a back surface of the corner portion of the cover is adhered to the bonding member heated by the heat generating portion The lid body is adhered to the inner surface of the recess. The portable terminal of claim 4, wherein the heat generating portion includes black printing that shields an outer side of the display area of the display unit.