JPH1052832A - Electronic equipment-housing case and its molding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve an assembling time of an electronic equipment-housing case constituted by hermetically engaging to connect a rear case with a front case. SOLUTION: A housing case of a portable telephone set is clamped with screws 6a to 6d by engaging to connect a front case 1 with a rear case 5. A thermoplastic elastic material composition having lower hardness than synthetic resin for molding the case 5 is composite molded at an opening edge of the case 5. At the time of engaging, an opening end of the case 1 presses the composition to deform it. The composition performs a role of a packing to hermetically hold the case.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a case for housing an electronic device therein, such as a portable telephone, and more particularly to an electronic device housing case in which a joint between a rear case and a front case has a dustproof / waterproof structure. .

[0002]

2. Description of the Related Art As is well known, portable telephones have been remarkably developed in recent years, and as various additional service functions have been enhanced, the penetration rate has been rapidly increasing. FIG. 8 is an exploded view showing a storage case of this type of mobile phone. Reference numeral 1 denotes a front case formed of synthetic resin and having a convex portion 1a (see FIG. 9) formed at an opening edge.
A push button 2 for pressing the other party's phone number, a display unit 3 for displaying the other party's phone number and characters, a built-in microphone, and a flip 4 for protecting the push button when closed (shown open) are provided. Have been. Reference numeral 5 denotes a rear case formed of the same synthetic resin as that of the front case and having a concave portion 5a formed at an opening edge portion. Have been. Reference numeral 8 denotes an antenna, which is inserted into an insertion hole 9 provided in the rear case 5 via an antenna packing 8b and is screwed into the insertion hole 9 to be inserted and fixed. Reference numeral 10 denotes a circuit board on which various electronic components are mounted, and provided with insertion holes 11a to 11d for inserting screws 6a to 6d. Reference numeral 12 denotes a packing mounted in the concave portion of the rear case 5.

Next, the procedure for assembling the conventional portable telephone shown in FIG. 8 will be described. First, the packing 12 made of an elastic member is inserted into the concave portion 5a formed at the opening end of the rear case 5, and then the circuit board 10 and the front case 1 are placed on the rear case, and the screws 6a to 6d are attached to the rear case. Insertion holes 7a to 7d from the rear side, and insertion holes 11 of the circuit board 10
The screws are screwed into screw holes (not shown) provided in the front case 1 through a to 11d and attached integrally. As a result, the packing 12 mounted in the concave portion 5a of the rear case 5 is crushed by the convex portion 1a formed on the front case 1 as shown in the sectional view of FIG. I do.

On the other hand, the antenna 8 is hermetically attached by inserting the antenna 8 into the insertion hole 9 of the rear case 5 via the packing 9 and screwing the screw portion 8a. As a result, since the inside of the case is kept airtight, dust, vapor in the air, and moisture do not enter from the outside, and the circuit board 10
There is no deterioration of electronic components and the like mounted on the device.

[0005]

In a conventional electronic device storage case such as a portable telephone device, packing of an elastic member is inserted between a rear case and a front case in order to keep the inside of the case airtight. I have. This packing is mounted in a concave portion at the opening end of the rear case, but is mounted over a relatively long range, and is easily deformed because of an elastic member. It took a long time to work because it could not be mounted.

The present invention has been made in view of such a conventional problem, and has as its object to eliminate the operation of mounting the packing and shorten the assembly operation time.

[0007]

According to a first aspect of the present invention, there is provided an electronic device storage case for storing an electronic device, the rear case being made of a synthetic resin having an opening on one side, and the rear case having an opening edge. An electronic device comprising: a front case made of a synthetic resin whose edge is fitted and joined to close the opening; and an elastic member inserted between edges where the front case and the rear case are fitted and joined. In the device storage case, the elastic member is a thermoplastic elastic material composition having a hardness lower than that of a synthetic resin for molding the rear case or the front case, which is composite-molded to the edge of the rear case or the front case by heat fusion. It is what it was.

According to a second aspect of the present invention, there is provided an electronic device housing case for housing an electronic device, the rear case being made of a synthetic resin having an opening on one surface, and the edge fitted to the opening edge of the rear case. The electronic device storage case, comprising: a front case that is joined and made of a synthetic resin that covers the opening; and an elastic member that is inserted between edges where the front case and the rear case are fitted and joined. The elastic member is a thermoplastic elastic composition having a lower hardness than the synthetic resin for molding the rear case or the front case, which is composite-molded to the edge of the rear case or the front case by heat fusion, and In the composite molded portion of the rear case or front case obtained by composite molding of the plastic elastic body composition, in the direction in which the front case or the rear case to be fitted and joined is fitted and joined. It is obtained as the convex portion is formed to protrude perpendicularly with.

According to a third aspect of the present invention, there is provided an electronic device housing case for housing an electronic device, the rear case being made of a synthetic resin having an opening on one side, and the edge fitted to the opening edge of the rear case. The electronic device storage case, comprising: a front case that is joined and made of a synthetic resin that covers the opening; and an elastic member that is inserted between edges where the front case and the rear case are fitted and joined. The elastic member is a thermoplastic elastic composition having a hardness lower than that of the synthetic resin for molding the rear case or the front case, which is composite-molded to the edge of the rear case or the front case by heat fusion; A notch is formed at the corner of the front case or rear case side end to be fitted and joined to the member, and the front case or rear case side end is formed by being fitted and joined. Those that are configured to flex.

According to a fourth aspect of the present invention, there is provided a storage case for an electronic device, comprising: a rear case and a front case made of synthetic resin each having an opening on one surface for storing the electronic device;
When joining the rear case and the front case, a side mold core made of synthetic resin whose both ends are respectively inserted into concave portions formed at the opening edges thereof, the side mold core is placed at the center of the side of the side mold core. It has a side mold formed by compounding a thermoplastic elastomer composition having a lower hardness than the synthetic resin to be formed by heat fusion, and when the rear case and the front case are joined, a part of the ends of the rear case and the front case. Are configured to press and deform the side mold.

According to a fifth aspect of the present invention, there is provided a molding method, comprising: a rear case made of a synthetic resin having an opening on one surface for housing an electronic device; In a molding method for molding a thermoplastic elastomer composition on one edge of a front case made of a synthetic resin that closes the opening, a molding of the front case or the rear case in which the thermoplastic elastic composition is complex-molded. Is a case where the first mold slide is slid to at least the part to be composite-molded, and is fixed at the molding position and the case molding step for injection molding is performed, and the first mold slide is slid while the other molds are fixed. The first evacuation process for evacuation and the second cavities slide for molding the thermoplastic elastic composition are slid, and the above-mentioned other molding dies are fixed and the above-mentioned cavities are fixed. A composite molding process in which the thermoplastic elastomer composition is injection-molded while being fixed at the same molding position as that of the first mold slide, and a second retreating process in which the second mold slide is slid and retracted. It is.

According to a sixth aspect of the present invention, in the molding method of the fifth aspect, an antenna for an electronic device is inserted near an end of a rear case or a front case for composite molding of the thermoplastic elastic composition. The thermoplastic elastomer composition is simultaneously injection-molded also around the insertion hole during the composite molding process.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an exploded view showing the electronic device storage case according to the first embodiment of the present invention from the front case 1 side, and FIG. 2 is an exploded view showing the same from the rear case side. Is a push button, 3 is a display, 4 is a flip, 5 is a rear case, 6a to 6d are screws, 7a to 7d are screws 6a to 6d insertion holes, 8 is an antenna, and 9 is an insertion hole 9, 10 for inserting an antenna 8. Is a circuit board, and 11b and 11c are insertion holes for screws 6b and 6c, which are the same as the conventional device shown in FIG.

Reference numeral 13 denotes a battery stored in the rear case 5, and reference numeral 14 denotes a battery case mounted on the rear case 5, which closes an opening of the rear case 5 storing the battery 13 when mounted. . Reference numeral 15 denotes a side mold formed around the opening edge of the rear case 5, which is injection-molded by a molding method described later. The thermoplastic elastomer composition has a lower hardness than the synthetic resin for molding the rear case 5. The composite is formed around the opening edge of the rear case 5 by heat fusion. The molded article formed in such a composite molding is also called two-color molding, and is described as a composite molded article in, for example, JP-A-1-139240. As the rear case 5, a molded body made of, for example, an ABS resin can be used. As the side mold 15, 100 parts by weight of a thermoplastic elastic body described in JP-A-1-139240 and polyether block amide are used. Although a thermoplastic elastic composition comprising 25 to 185 parts by weight can be used, any other thermoplastic elastic composition having a lower hardness than the synthetic resin for molding the rear case 5 may be used. good.

Next, a procedure for assembling the portable telephone device according to the first embodiment of the present invention shown in FIGS. 1 and 2 will be described. First, the circuit board 10 and the front case 1 are placed on the rear case 5, and screws 6a to 6d are screwed into the screw holes 16a to 16d provided in the front case 1 through the insertion holes 7a to 7d from the rear surface side of the rear case. These are attached together. Thereby, the front case 1 is fitted and joined to the rear case 5 and the side mold 15 formed around the open end of the rear case 5 has an end portion as shown in FIGS. It is crushed by the opening edge of the front case 1 and keeps the inside of the case airtight and dustproof and moistureproof. The battery case 14 is a battery 13
The hook engages with the rear case 5 on which the battery is mounted, and closes the battery housing opening of the rear case 5.

On the other hand, the antenna 8 is inserted and fixed in the insertion hole 9 of the rear case 5. As shown in FIG. 5, the inside of the case is hermetically sealed by an antenna packing 17 formed on the inner periphery of the insertion hole 9. It is attached. The antenna packing 17 may be the same packing as that of the related art, or may be a composite formed integrally with the side mold 15 on the rear case 5 as shown in FIG. As a result, the inside of the case is kept airtight, so that dust, air vapor,
There is no invasion of moisture and no deterioration of electronic components and the like mounted on the circuit board 10. Moreover, since the open end portions of the rear case 5 and the front case 1 are made airtight by the composite molded side mold 15, the conventional packing mounting work can be omitted, and the assembling work time can be reduced.

Here, as shown in FIG. 4, the side mold 15 may be provided with a notch 15a at a corner at the end of the front case 1 to be fitted and joined. In this case, the notch 15 Since the thickness of the end portion of the side mold 15 pressed by the front case 1 can be reduced and easily bent, the airtightness can be further improved. Also,
As shown in FIG. 4, the composite molded portion of the rear case 5 is provided with a convex portion 5a projecting in a direction perpendicular to the direction in which the front case 1 is fitted and joined. And the surface area where the side mold 15 and the rear case 5 are fused is increased, so that the adhesion can be improved.

Next, the side mold 15 is attached to the rear case 5.
Will be described with reference to FIG. FIG. 6A is a cross-sectional view illustrating a state where the rear case 5 is being formed, and FIG. 6B is a cross-sectional view illustrating a state where the side mold 15 is composite-molded on the formed rear case 5. . In FIG. 6, reference numeral 18 denotes a core of a fixed mold, 19
Is a cabinet movable in the directions of arrows A and B, and 20 and 21 are slide cabs movable in the directions of arrows C and D.
That is, when molding the rear case 5, the mold 19 is moved toward the core 18 in the direction B, and the slide cabinet 21 is moved in the direction D, and held in the state shown in FIG. Then, the rear case 5 is formed. Next, the mold slide 20 is retracted in the direction C, and another mold slide 21 is retracted.
Is moved in the direction B to maintain the state shown in FIG. In this state, the thermoplastic elastic composition is injected, and the side mold 15 is composite-molded on the rear case 5 by thermal fusion. Thereafter, the mold slide 19 is retracted in the direction A and the mold slide 21 is retracted in the direction C, thereby obtaining the rear case 5 in which the side mold 15 is composite-molded around the opening edge.

According to the first embodiment of the present invention, the side mold 15 as an elastic member is exposed as a band-shaped line outside the case, so that the side mold 15 does not slip when holding the case by hand, Further, the strip-shaped line can provide a design effect. In addition, the molding die of the cabinet slide 21 may be formed such that the antenna packing 17 is simultaneously molded on the inner periphery of the antenna insertion hole 9 adjacent to the side mold 15 at the time of molding the side mold 15 in FIG. . In the first embodiment, the side mold 15
Is formed on the rear case 5, but may be formed on the front case 1 side.

Embodiment 2 FIG. 7 is a cross-sectional view of a fitting joint between rear case 5 and front case 1 showing Embodiment 2 of the present invention. In the figure, 1 is a front case, 5 is a rear case, 22 is a substantially square frame shape in conformity with the shape of the opening edges of the front case 1 and the rear case 5, and the projections 22a, 22a at both ends are respectively formed. A side mold core 23 made of a synthetic resin inserted into a concave portion formed at an opening edge of the front case 1 and the rear case 5 as shown in FIG. This is a side mold in which a thermoplastic elastic composition having a lower hardness than the synthetic resin to be molded is composite-molded by heat fusion.

That is, the electronic device storage case according to the second embodiment of the present invention is configured such that the side mold core 22 formed by compound molding of the side mold 23 is separate from the front case 1 and the rear case 5. The side mold core 22 is fitted by inserting the protrusions 22a, 22a at both ends into recesses formed at the opening edges of the front case 1 and the rear case 5, and fits the front case 1 and the rear case. Since both ends of the side mold 23 are pressed and deformed by the ends of the front case 1 and the rear case 5 in a state in which the case 5 is fitted and joined, the inside of the case can be kept airtight.

According to the second embodiment of the present invention, even if the front case 1 and the rear case 5 have a plurality of types of collars, the side mold core 22 and the side mold 23 can be commonly used. Further, the side mold 23 as an elastic member is exposed as a band-shaped line outside the case, so that the side mold 23 does not slip when holding the case by hand, and the band-shaped line can exhibit a design effect. It is.

[0023]

As described above, the first aspect of the present invention is as follows.
According to the electronic device storage case according to the elastic member for airtightly fitting and joining the rear case and the front case,
Since it is a thermoplastic elastomer composition having a lower hardness than the synthetic resin for molding the rear case or front case, the packing is attached to the rear case or the front case. This has the effect of shortening the assembly work time.

According to the electronic device storage case of the second aspect of the present invention, the elastic member for airtightly fitting and joining the rear case and the front case is attached to the opening edge of the rear case or the front case. It is a thermoplastic elastomer composition having a lower hardness than the synthetic resin forming the rear case or the front case, which is formed by fusion bonding, and the front case or the rear case to be fitted and joined to the composite formed portion is fitted. Since the projecting portion is formed to project in a direction perpendicular to the direction of mounting and joining, the assembling work time can be reduced, and the adhesiveness of the composite molded thermoplastic elastic composition is improved. This has the effect that the convex portion can be used as a load receiver at the time of fitting and joining.

According to the electronic device storage case of the third aspect of the present invention, an elastic member for airtightly fitting and joining the rear case and the front case is provided on the opening edge of the rear case or the front case. A thermoplastic elastic composition that is composite-molded by fusion and has a lower hardness than the synthetic resin that forms the rear case or front case, and is cut at the corner of the front case or rear case side end to be fitted and joined. Since the notch is formed, the thermoplastic elastic composition as the elastic member is easily bent, and has an effect of further improving the airtightness.

Further, according to the storage case for electronic equipment according to claim 4 of the present invention, the side mold core formed by compound molding of the side mold of the thermoplastic elastic composition is formed separately from the front case and the rear case. Therefore, even if there are a plurality of types of collars in the front case and the rear case, the side mold core and the side mold can be used in common, which has an effect of improving productivity.

According to the molding method according to the fifth aspect of the present invention, when molding the front case or the rear case to be composite-molded, the first cab slide is slid at least to the portion to be composite-molded, and is moved to the molding position. A case molding step of fixing and injection molding, a first retracting step of sliding and retracting a first mold slide with another mold fixed, and a second retracting step of molding a thermoplastic elastic composition. A composite molding process in which a mold slide is slid and the thermoplastic mold composition is injection-molded while being fixed at the same molding position as that of the first mold slide while the other molding die is fixed. And the second retracting step of sliding and retracting the second mold slide, so that the composite molding can be performed in a continuous step, and the molding can be performed efficiently. There is that effect.

Further, according to the molding method of the sixth aspect of the present invention, in the molding method of the fifth aspect, the antenna insertion near the end of the rear case or the front case for composite molding of the thermoplastic elastic composition. Because the thermoplastic elastomer composition was also injection molded at the same time inside the hole,
There is an effect that the working efficiency can be further improved.

[Brief description of the drawings]

FIG. 1 is an exploded assembly view showing a mobile phone device according to Embodiment 1 of the present invention from the front case side.

FIG. 2 is an exploded assembly view showing the mobile phone device according to Embodiment 1 of the present invention from the rear case side.

FIG. 3 is a sectional view showing the internal structure of the mobile phone device according to Embodiment 1 of the present invention.

FIG. 4 is a cross-sectional view showing a fitting joint between a rear case and a front case of the mobile phone device according to Embodiment 1 of the present invention.

FIG. 5 is a sectional view showing an antenna insertion portion of the mobile phone device according to Embodiment 1 of the present invention.

FIG. 6 is a cross-sectional view for explaining a method for molding an electronic device storage case according to the present invention.

FIG. 7 is a cross-sectional view showing a fitting joint between a rear case and a front case of the mobile phone device according to Embodiment 2 of the present invention.

FIG. 8 is an exploded view showing a conventional mobile phone device viewed from a front case side.

FIG. 9 is a partial cross-sectional view showing a conventional mobile phone device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Front case 5 Rear case 8 Antenna 10 Circuit board 13 Battery 14 Battery case 15 Side mold 17 Antenna packing 22 Side mold core 23 Side mold

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical display location B29L 31:34

Claims (6)

[Claims] 1. A rear case made of synthetic resin having an opening on one side for housing an electronic device, and a front made of synthetic resin whose edge is fitted to and joined to an opening edge of the rear case to close the opening. In an electronic device storage case including a case and an elastic member inserted between edges where the front case and the rear case are fitted and joined, the elastic member may be an edge of the rear case or the front case. An electronic device storage case, comprising a thermoplastic elastic composition having a lower hardness than a synthetic resin for forming the rear case or the front case, which is composite-molded by heat fusion to a portion. 2. A rear case made of a synthetic resin having an opening on one side for housing an electronic device, and a front made of a synthetic resin whose edge is fitted and joined to an opening edge of the rear case to close the opening. In an electronic device storage case including a case and an elastic member inserted between edges where the front case and the rear case are fitted and joined, the elastic member may be an edge of the rear case or the front case. The thermoplastic elastomer composition having a lower hardness than the synthetic resin for molding the rear case or the front case, which is composite-molded by heat fusion to the part, and the rear case or the composite molding of the thermoplastic elastic composition. The composite molded part of the front case is formed with a projection that projects in a direction perpendicular to the direction in which the front case or the rear case to be fitted and joined is fitted and joined. And an electronic device storage case. 3. A rear case made of a synthetic resin having an opening on one surface for housing an electronic device, and a front made of a synthetic resin whose edge is fitted to and joined to an opening edge of the rear case to close the opening. In an electronic device storage case including a case and an elastic member inserted between edges where the front case and the rear case are fitted and joined, the elastic member may be an edge of the rear case or the front case. A thermoplastic resin composition having a hardness lower than that of the synthetic resin forming the rear case or the front case, which is composite-molded by heat-sealing, and which is fitted and joined to the elastic member. A notch is formed at a corner of the case side end, and the front case or the rear case side end is configured to bend by fitting and joining. Child device storage case. 4. A rear case and a front case, each of which is made of a synthetic resin and has an opening on one side, for accommodating an electronic device. Each of the side mold cores made of a synthetic resin to be inserted, a thermoplastic elastomer composition having a lower hardness than the synthetic resin for molding the side mold cores is formed at the center of the side portion of the side mold cores by heat fusion. An electronic device storage case, comprising: a side mold, wherein when the rear case and the front case are joined, a part of the end of the rear case and the front case is configured to press and deform the side mold. . 5. A rear case for housing an electronic device, made of a synthetic resin having an opening on one surface, or a front case made of a synthetic resin whose edge is fitted and joined to an opening edge of the rear case to close the opening. In the molding method for composite molding of the thermoplastic elastic body composition on any one of the edge portions, the molding of the front case or the rear case in which the thermoplastic elastic body composition is composite molded is at least in the first composite molding part. A case molding step of sliding the mold slide and fixing it at the molding position to perform injection molding; a first retracting step of sliding the first mold slide to retract with another mold fixed; The second mold slide for molding the plastic elastic body composition is slid, and the molding position of the first mold slide is the same as that of the first mold slide while the other mold is fixed. A molding method comprising: a composite molding step of injection-molding a thermoplastic elastic composition while being fixed at a molding position; and a second retracting step of sliding and retracting the second cavity slide. 6. An insertion hole for inserting an antenna for an electronic device is formed in the vicinity of an end of a rear case or a front case in which a thermoplastic elastic composition is composite-molded. 6. The molding method according to claim 5, wherein the thermoplastic elastomer composition is simultaneously injection-molded.