KR101362720B1 - Manufacturing method for exterior casing of mobile device - Google Patents

Abstract

A method for manufacturing an exterior case for a mobile device according to the present invention provides impact resistance and strength to the exterior case for a mobile device, reduces the weight of the case, reduces the thickness of the case, enables various design freedom on texture and patterns of yarn of various colors, and provides the same or different texture and patterns of yarn to the front and back of the case.

Description

MANUFACTURING METHOD FOR EXTERIOR CASING OF MOBILE DEVICE}

The present invention relates to a method for manufacturing an outer case for a mobile device, and more particularly, a fiber reinforced skin including at least one layer of fiber fabric, and a bottom inner side adjacent to the edge of the fiber reinforced skin. An assembly frame integrally formed in the region and having at least one opening in the center thereof, and optionally a reinforcing frame located in at least a portion of the opening of the assembly frame, may be transferred to a resin transfer molding (RTM). By integrating, the thickness of the fiber-reinforced skin can be reduced to 0.2 to 0.8 mm, preferably 0.2 to 0.6 mm, and specifically 0.2 to 0.4 mm, while having sufficient rigidity and impact resistance. The casing can be realized while the texture and pattern of the fabric piece are implemented as it is, so that various designs can be implemented with high design freedom. High gloss is possible without a post-treatment process such as a separate buffing process to obtain high gloss, and if necessary, a separate high gloss surface treatment can be performed, or by using a non-conductive pigment as an exterior coating. The present invention relates to a method for manufacturing an exterior case for a mobile device, which can prevent the RF (Radio Frequency) characteristic from being affected.

Today, various types of mobile devices have excellent mobility, processing capability, and control characteristics, so that they can download and / or upload various information anytime and anywhere. Therefore, the utilization rate and the frequency of use in modern people 's life are rapidly expanding.

Such a mobile device is inherently easy to carry, which is one of its main characteristics, and it is in a trend of thinning and thinning (thinning and shrinking) in spite of rapid increase in functionality according to the development of electronic technology.

However, it is believed that the thinning of the exterior case according to the prior art as part of meeting the trend of light and short reduction of the mobile devices mentioned above is limited because it cannot be made to be less than the thickness to sacrifice it in consideration of strength or impact resistance. come.

Specifically, the thickness of a resin outer case having a size of a general mobile device, especially a small phone such as a feature phone or a smartphone, is generally at least 0.8 mm, and typically Is about 1 mm or more, and in the case of an external case of about 20 inches such as a notebook, a thickness of about 2 mm is generally required. As the material of the external case for a mobile device, polycarbonate (PC), which is a thermoplastic resin, Examples of polyacrylate (PA), acrylonitrile butadiene styrene (ABS), alloys of PA and ABS, or glass fiber chop as a filler, homogeneous and simple mixing of the above resin raw materials Can be.

The present applicant is a conventional method for overcoming the above limitations of the prior art through Resin Transfer Molding (RTM) using glass fiber fabric through Korea Patent Application No. 2011-0120532 (2011.11.17. Filed) and An antenna integrated mobile device case is implemented by insert molding.

According to the above-mentioned unpublished prior art, there is proposed a method of manufacturing a mobile device case which uses a guide pin for position fixing and a push pin that can be retracted when being combined to achieve position fixing of an antenna and glass fiber fabric as an insert. In this method, since there is no separate assembly frame for reinforcing edge strength, even if the RTM molding method using glass fiber fabric is used, the thickness of the case can only be maintained at about 0.6 to 0.8 mm, and the case thickness is 0.6 mm or less. If the ultra-thin outer case of the case was not able to achieve a sufficiently satisfactory structural rigidity.

On the other hand, except for the unpublished application by the present applicant, the method for manufacturing an exterior case for a mobile device having sufficient strength while achieving a thinness by integrating it with a resin by a resin transfer molding method using glass fiber fabric flakes or the like. The present inventors have grasped that there is no prior art.

Accordingly, the first object of the present invention is to manufacture an exterior case for a mobile device for economically and efficiently manufacturing an external case for a thin mobile device having a sufficiently satisfactory impact resistance, structural strength and light weight. It is to provide a method.

It is a second object of the present invention to provide a method for manufacturing an exterior case for a mobile device that can implement textures and patterns of various black and white or color glass fiber fabric pieces with high design freedom.

A third object of the present invention is to provide a method for manufacturing an exterior case for a mobile device having the same or different fiber fabric textures and patterns on the front and back.

A fourth object of the present invention is to provide a method for manufacturing an exterior case for a mobile device, which can efficiently and easily implement a round shape of an edge.

A fifth object of the present invention is to provide a method for manufacturing an exterior case for a mobile device, which is capable of high gloss without a post-treatment process such as a separate buffing (polishing) process for obtaining high gloss.

According to a preferred aspect of the present invention for smoothly achieving the first to fifth objects of the present invention described above, (A) providing an assembly frame having at least one opening in the center; (B) positioning the inner core inside the assembly frame as described above, placing at least one layer of fiber fabric piece on the bottom of the assembly frame, and one layer on the upper surface of the inner core. Combining the upper and lower molds with the fiber fabric pieces positioned; (C) forming a fiber-reinforced skin in which an assembly frame is integrated by simultaneously performing Resin Transfer Molding (RTM) and insert molding; And (D) extracting the inner core by cutting and removing the fiber reinforced skin on the upper surface of the inner core surrounding the inner core, leaving only the edges: at least one layer of fibrous fabric. It consists of a fiber-reinforced skin including a thin film and an assembly frame integrally formed in the bottom inner region adjacent to the edge of the fiber-reinforced skin and having at least one opening in the center thereof. In the case of 0.2-0.5mm and 0.4-0.8mm for a laptop, a manufacturing method of an external case for a mobile device is provided.

In the present invention, in addition to the frame for the assembly in the step (C), the reinforcing frame is provided together, and in the step (B), the inner core is positioned inside the assembly frame and the reinforcing frame, the upper and lower molds Can also be combined.

In the present invention, in the step (D), the battery cover, the camera window, or the speaker opening can also be cut together from the fiber reinforced skin on the bottom surface of the inner core surrounding the inner core.

In addition, in the present invention, the step (D) may be followed by the step (E) of polishing the outer surface of the fiber-reinforced skin, or the inner and outer surfaces.

In the present invention, following the above-mentioned step (E), (F) may further perform a top coating for imparting scratch resistance.

In the present invention, it is also possible to provide an assembly frame in which the speaker grill unit or a plurality of fixing units are integrally formed in the above (A) step.

In the present invention, the speaker grill part or a plurality of fixing parts may be placed as a separate member in the assembly frame in the above-mentioned step (B).

In addition, in the present invention, following the above-mentioned step (E), the speaker grill part or a plurality of fixing parts may be assembled to the assembly frame as separate members.

In the present invention, following the above-described step (F), the speaker grill portion or the plurality of fixing portions may be assembled as a separate member to the assembly frame.

In the present invention, at least one antenna may be positioned between the inner surface or the outer surface of the fiber reinforced fabric piece of the inner core bottom or the fiber reinforced fabric piece in the above step (B).

In the present invention, in the above-mentioned step (B), a logo part or a letter part, or a resin material or metal carrier containing them may be placed on the outer surface of the fiber reinforced fabric piece of the inner core bottom.

Here, the above-mentioned at least one fibrous element segment is a fabric or non-fabric original piece made of inorganic fibers, organic fibers, or hybrid fibers thereof.

Here, it is preferable that the above-mentioned at least one fiber raw material piece is a glass fiber.

In addition, the above-mentioned at least one fibrous element segment is composed of two layers, and at least one insert may be integrated between the above two fibrous element segments, or on the outside or inside thereof.

Here, the insert may be an antenna, a logo part or a letter part having a predetermined pattern, or a resin material or a metal material carrier including the same.

In addition, the fiber reinforced skin preferably has a tensile strength of 500 ~ 2000kg / cm ² .

As described above, according to the manufacturing method according to the present invention, the exterior case for a mobile device is sufficiently thin while having a sufficiently satisfactory impact resistance, strength and light weight, and is made of various black and white or color. It is possible to realize the texture and pattern of the fabric piece with a high degree of design freedom, as well as to have the texture and pattern of the same or different fiber fabric on the front and back, and to assemble the frame and / or reinforcement frame and fiber reinforced skin It is integrated, and high gloss is possible without a post-processing process such as a separate buffing (polishing) process to obtain high gloss, and optionally, an antenna or a logo can be easily integrated into a beautiful form.

1A and 1B are respectively a perspective view and an exploded bottom view showing the structure of an exterior case for a mobile device manufactured according to the manufacturing method of the present invention.
2 is a bottom perspective view of another exterior case for a mobile device manufactured according to the manufacturing method of the present invention.
3A to 3C are schematic cross-sectional views of a fiber reinforced skin structure of another exterior case for a mobile device manufactured according to the manufacturing method of the present invention, respectively.
4 is a bottom perspective view of another exterior case for a mobile device manufactured according to the manufacturing method of the present invention.
5A and 5B are respectively a perspective view and a bottom perspective view showing the structure of another exterior case for a mobile device manufactured according to the manufacturing method of the present invention.
6A and 6B are perspective views of another exterior case for a mobile device manufactured according to the manufacturing method of the present invention, respectively, and an enlarged photograph of a fiber fabric piece applied thereto.
Figure 7 is an exemplary schematic perspective view of a securement installation for a fiber-reinforced skin.
FIG. 8 is an exploded view illustrating a state of a mold in a mold for molding an exterior case for a mobile device in the manufacturing method of the present invention.
Fig. 9 is a flowchart showing the operation of Fig.
10 is a manufacturing process flowchart illustrating the manufacturing method of the present invention.

The term " mobile device " used throughout the specification of the present invention refers to a cellular phone, an MP3 (Moving Pictures Experts Group) -1 Audio Layer-3, a PMP (Portable Media Player) A PDA (Personal Digital Assistant), a laptop, a notebook, a UMPC (Ultra-mobile Personal Computer), a tablet PC, a smart phone, a navigation device, Station Portable), an electronic dictionary, and the like, which is portable and capable of uploading and / or downloading information.

In addition, the term "fiber fabric piece" used in the present invention is a small piece of woven or nonwoven fabric made of inorganic fibers and / or organic fibers or mixed fibers thereof, and has a broad meaning including all of the following matters. Specifically, examples of the inorganic fibers described above include glass fibers, PAN- or pitch-based carbon fibers, ceramic fibers, and boron fibers. Preferably, the present invention is not limited to glass fibers or the present invention. Typical examples of the fibers include viscose rayon, cupra rayon, acetate, triacetate, polyamide-based nylon, polyester, polyvinyl chloride, acrylic, polyvinyllidene, polyurethane, polypropylene, polyvinyl alcohol, polyacrylonitrile, Cotton and the like, and the inorganic fibers and / or organic fibers or mixed fibers thereof may be the same color. Alternatively, at least two different colors may be woven or nonwoven in a specific pattern, and the small pieces of the woven fabric or the nonwoven fabric may be at least one immersion in a dye solution to have at least one color layer. In particular, by removing the at least a portion of the color layer in a specific pattern shape by laser patterning may be formed so that the fiber texture or weave of at least a portion of the area is exposed to the outside.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the accompanying drawings.

First, Figure 1a and Figure 1b is a perspective view and a bottom perspective view showing the structure of the outer case 1 for a mobile device manufactured by the manufacturing method of the present invention, respectively, its main configuration is at least one layer of fiber fabric (原) Frame 20 for assembly, which is integrally formed in the inner region of the bottom surface adjacent to the edge of the fiber reinforced skin 10 and including at least one opening 21 in the center thereof. It is composed of

The thickness of the fiber-reinforced skin 10 is 0.2 to 0.6 mm, preferably 0.2 to 0.5 mm, particularly 0.2 to 0.4 mm in the case of a mobile device of a size similar to that of a mobile phone, In the case of a mobile device of the size of about 1 inch, it is in the range of 0.4 to 1.0 mm, preferably 0.4 to 0.8 mm, in particular 0.4 to 0.6 mm.

The fiber reinforced skin 10 constitutes the outer surface of the outer casing 1 for a mobile device and is a main constituent for determining the thickness and appearance of the outer casing 1 for a mobile device. The thermoplastic resin or thermosetting resin In view of the feel of the external case 1 for a mobile device and the ease of detachment of the battery case (refer to reference numeral 18 in Fig. 2) and brittle fracture upon falling due to carelessness, thermoplastic Resins are preferred.

Typical examples of the above-mentioned thermoplastic resin include polycarbonate (PC), polyacrylate (PA), acrylonitrile butadiene styrene (ABS), and alloys of PC and ABS. As a typical example of the thermosetting resin, Phenol resin, urea resin, and melamine resin.

The fiber reinforced skin 10 is formed of a round portion 16 having a rounded edge, and the edge portion 16a forming the end surface may be formed as a horizontal surface.

When the mobile device is a smart phone or the like, the camera-seeing window 17 may be formed on the fiber-reinforced skin 10 described above.

The specific structure of the fiber-reinforced skin 10 will be described later in detail with reference to FIG.

On the other hand, the assembly frame 20 accommodates an electronic device unit (not shown) and functions as a component for assembling the electronic device unit (not shown), and supports the fiber reinforced skin 10 And the rim of the fiber reinforced skin 10 is formed to have a rounded portion 23 for closely contacting the rounded portion 16 of the fiber reinforced skin 10 and at least one opening 21 is formed at the center thereof And a plurality of fixing portions 24 are formed in the inner region adjacent to the rim.

Similarly, when the mobile device is a smart phone or the like, the camera window 22 may be formed in the assembly frame 20 as well.

The assembly frame 20 may be formed of the thermoplastic resin, the thermosetting resin, or aluminum, magnesium alloy, stainless steel, or ceramic as described above. In the manufacturing method of the present invention, the above-described function is performed. As long as it is lightweight and lightweight, there are no special restrictions on the material.

In the manufacturing method according to the present invention, the integration of the fiber-reinforced skin 10 and the assembling frame 20 is efficiently performed by simultaneous resin transfer molding and insert molding, but hot pressing or Of course, it can be made by laminating (laminating).

In the manufacturing method according to the invention the tensile strength of the fiber-reinforced skin 10 has a tensile strength of about 500 ~ 2000kg / cm ² , preferably 800 ~ 1500kg / cm ² , which is 1.0mm thick the tensile strength of the PC case 570kg / cm ² and a tensile strength 440kg / cm ² and, in the PC 0.8mm thick ABS case of the tensile strength of 560kg / cm ^2, or the thickness of 1.0mm chopped glass fiber reinforced PC case of a thickness of 0.8mm The tensile strength of the + ABS blend (alloy) is significantly higher than 580 kg / cm ² .

Next, FIG. 2 is a bottom perspective view of another outer case 1a for a mobile device manufactured according to the manufacturing method of the present invention. As described above, the battery cover 18 is formed in the fiber reinforced skin 10. Except for the same components, since the structure is essentially the same as the case of Figure 1a will be omitted, only the difference will be described.

The battery cover 18 is formed by cutting a part of the fiber reinforced skin 10 by a known means such as CNC cutting and is formed by cutting the upper and lower ends of the battery cover 18 and the fiber reinforced skins 10 The battery cover 18 can be detachably formed by forming a known fixing groove (not shown) and an insertion protrusion (not shown) at the upper and lower ends of the cutout portion of the battery cover 18, respectively.

3A to 3C are schematic cross-sectional views of the structure of the fiber reinforced skin 10 of the exterior case 1 for a mobile device according to the manufacturing method of the present invention, respectively. The at least one layer of fibrous fabric piece 11 and the inner and outer surfaces of the fibrous fabric piece 11 and formed therein are formed by resin transfer molding (RTM) into the molded resin portion 12 integrated therein.

Meanwhile, in the manufacturing method of the present invention, an antenna, a predetermined patterned logo or letter portion, or a metal accommodating the fiber reinforcement skin 10 constituting the outer case 1 for a mobile device is optionally selected as necessary. Alternatively, an insert 13, such as a carrier of a resin material, can be positioned at an appropriate position in the cross section of the fiber fabric piece 11.

Specifically, FIG. 3A shows a case where the fibrous element piece 11 is formed in a two-ply laminated structure, and at least one insert 13 is located on the upper surface of the uppermost fibrous element piece 11 Wherein the two-ply fibrous web piece 11 and at least one or more inserts 13 are integrally cured by the molded resin part 12 to form a fiber reinforced Thereby forming the skin 10.

In the example shown the insert 13 is optional in the manufacturing method of the present invention.

When the molding resin part 12 is formed by the RTM, not only the inside of the fabric matrix of each of the two-ply fibrous fragments 11 but also the contact gap between them and the contact gap between the insert 13 And the outer surface of the whole of the two-ply fibrous piece 11 and the insert 13 is smoothly and uniformly surrounded, and a surface No step is present.

The molded resin part 12 may be formed of a suitable resin as required, such as polycarbonate, polyacrylate, acrylonitrile butadiene styrene, PC and ABS alloys as described above, epoxy, polyethylene terephthalate But are not limited to, polyethylene terephthalate, polycarbonate, polyester, polymethyl pentene, polyether sulfon, polyether imide, polyarylate, poly And may be formed of a transparent resin such as polymethyl methacylate, urethane acrylate, epoxy acrylate, or polyester acrylate, but the present invention is not limited thereto no.

The above-mentioned fiber raw material piece 11 can be applied to a thickness of about 0.03 mm or more, and various patterns and colors can be realized. Also, if necessary, a transparent polycarbonate film or a polyurethane film can be laminated or impregnated with other resin have.

In addition, in the manufacturing method of the present invention, if necessary, the molded resin portion 12 may include a non-conductive pigment or an antistatic agent for preventing or reducing RF degradation of the antenna. Since it will be known in the art, a detailed description thereof will be omitted, and such a treatment may be particularly useful when the fiber fabric piece 11 has weak conductivity.

In the figure, reference numeral 5 denotes a top coating as an optional component, and may be, for example, a UV curable transparent hard coating layer or a colored coating layer or an antistatic layer excellent in scratch resistance.

In Fig. 3B, the fibrous fragments 11 are formed in a two-ply laminate structure, and at least one insert 13 is located in the intermediate layer between the two-ply fibrous fragments 11, The original piece and at least one or more inserts 13 are integrally cured by the molded resin part 12 to form the fiber reinforced skin 10 of the antenna-integrated mobile device case 1, Of course, it is optional in the present invention.

When the molded resin part 12 is formed by the RTM, the contact gap between the contact matrix and the insert 13 in the fabric matrix of each of the two-ply fibrous fragments 11 described above And the outer surfaces of the two-ply fibrous fragments 11 and the inserts 13 are smoothly and uniformly surrounded. The rest of the elements are essentially the same as those mentioned in Fig. 3A.

3C shows a case in which the fibrous fragments 11 are formed in a two-ply laminated structure, and at least one insert 13 is located at the bottom of the lowermost fibrous fragment 11, Wherein the two-ply fibrous web piece 11 and at least one or more inserts 13 are integrally cured by the molded resin part 12 to form a fiber reinforced Thereby forming the skin 10. When the molded resin part 12 is formed by the RTM, not only the inside of the fabric matrix of each of the above-described two-ply fibrous fragments 11 but also the contact gap between them and the at least one insert 13 The contact gap is filled and the outer surfaces of the two-ply fibrous fragments 11 and the inserts 13 are smoothly and uniformly surrounded.

Although the antenna 13 includes the antenna or logo or letter portion or a carrier including the same as the insert 13, the assembly frame 20 is also integrated with the fiber reinforced skin 10 described above by insert molding and RTM. .

According to the present invention, the texture and the pattern of the fiber fabric pieces 11 of the front and rear surfaces, which may be the same or different, are free of course, and the front and back surfaces of the fiber reinforced skin 10 to be molded have the same glossiness. Of course, when using a mold having a high surface smoothness, a separate polishing process may be unnecessary.

4 is a bottom perspective view of another exterior case 1b for a mobile device that can be manufactured according to the manufacturing method of the present invention, and is substantially the same as the above-described example except that the reinforcing frame 30 is further applied. Only the differences will be mentioned mainly.

Although the reinforcing frame 30 is located in one large opening 21 formed at the center of the assembling frame 20 for the purpose of thinning the frame 20 in the illustrated example, Or may be formed across the opening 21 and the opening 21 when the opening 21 is provided.

The reinforcement frame 30 may be selectively used when additional rigid reinforcement is required for the exterior case 1b for a mobile device or when the electronic device is required to be mechanically supported by the device. In the manufacturing method of the present invention, The overall shape or shape of one reinforcing frame 20, the number and shape of openings 31 formed therein, and the like are all optional.

The reinforcing frame 30 may be formed of a thin plate made of metal or resin, and the types of the metal and resin are the same as those described above, and therefore, the description thereof will be referred to.

As in the case of the assembly frame 20, the reinforcement frame 30 is also integrated with the assembly frame 20 and the fiber reinforced skin 10 by insert molding.

In the illustrated example, a plurality of fixing holes 24a and / or positioning portions 25 are formed in the reinforcement frame 30, but such components are also used in the manufacturing method of the present invention. Is optional.

5A and 5B are respectively a perspective view and a bottom perspective view showing the structure of another exterior case 1c for a mobile device that can be manufactured by the manufacturing method of the present invention, and the basic structure thereof is substantially the same as described above. Only the differences will be mentioned mainly.

In the illustrated example, the speaker grill portion 26 is formed to be exposed on the outer surface of the fiber-reinforced skin 10 as a fitting member. The speaker grill portion 26, as described above, It may be molded as a part of the assembly frame 20 during injection molding of the frame 20, or it may be injection-molded as a separate independent component and assembled and used.

The outer case 1c for a mobile device as shown in the figure is formed by first forming a fiber reinforced skin 10 and then forming a portion where the speaker grill portion 26 is to be positioned by using any known means such as CNC cutting The speaker grill portion 26 may be formed by integrally molding the assembly frame 20 integrally formed in advance with the speaker grill portion 26 or by integrating the assembly frame 20 with the fiber reinforced skin 10) may be obtained by any known means such as CNC cutting or the like.

Further, if necessary, a sub-member such as the speaker grill portion 26 may be separately injection-molded and then insert-molded or bonded thereto.

In the illustrated example, a plurality of fixing portions 24 and fixing holes 24a are formed at the lower end of the assembly frame 20, A portion corresponding to the fixing portion 24a and the fixing portion 24 is perforated so as to be capable of screwing and detaching from the outside.

6A and 6B are respectively enlarged perspective views of another exterior case 1d for a mobile device that can be manufactured by the manufacturing method of the present invention and an enlarged photograph of the fiber fabric piece 11 applied thereto. An example in which at least one antenna as the insert 13 is applied to the upper surface of the above-described fiber fabric piece 11 is shown (see FIG. 3A).

As clearly seen in the illustrated example, the exterior case for mobile device 1d according to the manufacturing method of the present invention can realize the texture and pattern of the fiber fabric piece 11 as it is, as if it is an exterior case made of a woven fabric. In some cases, a top coat (see reference numeral 14 in FIGS. 3A to 3C) as a colored coating layer or a top coat layer may be formed in order to conceal or compensate the pattern if necessary. .

7 is an exemplary schematic perspective view illustrating the direct mounting of the fixation portion 19 to the fiber-reinforced skin 10, in the illustrated example, inside the round portion 16 adjacent to the rim of the fiber- A plurality of fixing portions 19 which are formed by injection molding as separate components are formed by insert molding. The fixing portion 19 may be any known shape such as a hook shape or a step shape, .

Or the fibrous reinforcing skin 10 described above may be formed in a flat shape so as to cover only one large central opening 21 area in the assembling frame 20 shown in the case of Fig. A plurality of fixing holes 24 or fixing holes 24a as described above are provided in the inner region of the round portion 23 of the assembly frame 20 in the case of injection molding of the assembly frame 20 However, it is needless to say that it may be provided in the assembly frame 20 by the separate insert molding as described above.

Optionally, at least a portion of the distal region of the rounded portion 16 of the fiber-reinforced skin 10 may be further curved inwardly to have a hook structure or an undercut structure, It is of course also possible for these areas to function as fixed parts, which is also within the scope of the invention.

8 is an exploded assembly view showing a state of a mold in a mold for insert transfer molding (RTM) and insert molding of the exterior cases 1, 1a to 1d for mobile devices described above with respect to the manufacturing method of the present invention; A description thereof will be provided with reference to FIG. 9, which is a flowchart of the operation.

The exterior cases 1, 1a to 1d for a mobile device manufactured according to the manufacturing method of the present invention are manufactured by the following steps.

(A) Assembly frame (20) Providing step:

(20) preformed in injection molding and having at least one opening (21) in the center.

(B) Synthesis step:

The inner core 40 is positioned inside the above-mentioned frame for assembly 20 (B1). The inner core 40 is composed of a body 41 having a smooth surface 42 on the upper surface and a protrusion 44 is formed and has a round lower portion 43.

Next, at least one fold, typically two or three fold fibrous pieces 11 are placed on the bottom surface of the assembly frame 20 and placed in the cavity 51 of the lower mold 50 (B2) .

Next, a single-piece fibrous piece 11 having an opening 11a formed on the upper surface of the inner core 40 is positioned so as to penetrate the protruding portion 44 through the opening 11a (B3).

Subsequently, the upper and lower dies 60 and 50 are closed and assembled (B4).

(C) Resin Transfer Molding (RTM) Step:

Then, molten resin of high temperature and high pressure is injected to perform resin transfer molding and insert molding at the same time.

By repeating the rapid cycling of rapid heating and quenching, the above-described resin transfer molding can remarkably shorten the cycle of 1 cycle, which has conventionally taken 1.2 to 3.5 hours, to about 35 to 55 minutes, Is provided with a plurality of suction holes (not shown) for sucking the air in the cavity under reduced pressure to maintain it in a vacuum or a reduced pressure state.

Finally, after the molding is completed, the upper and lower molds 60 and 50 are released and molded resin portions (refer to reference numeral 12 in FIG. 3A) are moved into and out of the fiber fabric piece 11 by resin transfer molding and insert molding. Fiber case skin 10 is formed and integrally formed, the assembly frame 20 is an external case for a mobile device manufactured according to the manufacturing method of the present invention integrated into the fiber reinforcement skin 10 by insert molding (1,1a-1d) is taken out.

Here, if necessary, in addition to the frame 20 for assembly in step (A) described above, a reinforcing frame (see reference numeral 30 in FIG. 4) is provided together, and the frame for assembly described in step (B) above. By placing the inner core 40 inside the reinforcing frame 30 and 20, the upper and lower molds 60 and 50 are combined to perform the steps (B) to (D) as shown in FIG. Of course, the mobile device external case 1b according to the manufacturing method of the present invention may be manufactured.

In the present invention, following step (C), (D) the fiber-reinforced skin 10 formed on the upper surface of the inner core 40 surrounding the inner core 40 is left only at the edges The edge portion 16a forming the end of the round portion 16 of the fiber reinforced skin 10 is formed at the inner side of the inner core 40 at the time of molding, Is formed by the fibrous fragments 11 on the upper surface of the core 40 so that the rim end 16a has a uniform height without any difference in height and can be formed in a horizontal plane.

If necessary, the fiber-reinforced skin 10 on the bottom surface of the inner core 40 surrounding the inner core 40 may be cut by CNC cutting or the like in the step of (D) 18) or a window 17 for a camera.

Further, in the above-described step (A), in the form of a frame 20 for assembly in which a speaker grill section (see reference numeral 26 in FIG. 5B) or a plurality of fixing sections (refer to reference numeral 24 in FIG. .

In the step (B), the assembly frame 20 is provided with a speaker grill portion 26 as a separate member or a plurality of fixing portions (refer to reference numeral 24 in Fig. 1B) And reference numeral 24b in Fig. 5B) (see Fig. 10).

At least one insert (FIG. 3A to FIG. 3A) is formed between the inner surface or the outer surface of the fiber element piece 11 on the bottom surface of the inner core 40 or between the fiber element pieces 11 and 11 in the step (B) 3b and reference numeral 13 in Fig. 6a) may be placed on the outer surface (bottom layer) of the fiber element piece 11 on the bottom surface of the inner core 40 in the step (B) A logo portion, a character portion, or a synthetic resin or metal carrier containing them may be placed.

Finally, FIG. 10 is a flowchart illustrating a manufacturing process of the exterior cases 1, 1a to 1d for mobile devices manufactured by the manufacturing method of the present invention, which will be referred to with reference to FIGS. 8 and 9.

First, the step of providing the assembly frame 20 or the assembly frame 20 and the reinforcing frame 30 is performed, and then the surface treatment step is performed to improve the adhesion at the time of insert molding.

Here, the above-described surface treatment step consists of laser etching or chemical pickling and chemical spraying or printing for etching, surface cleaning, and fine irregular structure formation. However, since the above matters are well known in the insert molding field, It will be omitted.

Then, the resin transfer molding and the insert molding as described above are simultaneously carried out.

Next, in order to take out the inner core 40, to process the edge 16a of the inner core 40, and to make the outer case 1 (1a-1d) for the molded mobile device as described above, presses, CNC Computer numerical control type) A cutting step of cutting by means such as a machine tool, a laser or the like is performed.

If necessary, the step (D) may be followed by the step (E) of polishing the outer surface or the inner and outer surfaces of the fiber-reinforced skin 10 described above, and if necessary, (F), a top coating for imparting scratch resistance may be further performed. The top coating described above has already been mentioned in the description of FIGS. 3A to 3B.

In addition, in the manufacturing method of the present invention, following the above-mentioned step (E), the speaker grill part 26 or the plurality of fixing parts 24 described above as separate parts may be assembled to the assembling frame 20. Alternatively, the step (F) may be followed by such a step, and of course, it is also within the scope of the present invention.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, the invention is not to be limited to the details and various changes and modifications may be suggested to those skilled in the art.

1, 1a, 1b, 1c, 1d: an outer case for a mobile device according to the present invention
10: Fiber reinforced skin
11: Fibrous original piece (original forged piece) 12: Molded resin part
13: insert 14: top coating
16: round section 16a: rim end
17: Windows 18: Battery cover
19:
20: Assembly frame
21: central opening 22: camera window
23: round section 24:
24a: Fixed hole 25: Position selection part
26: speaker grill part
30: reinforcing frame 31: opening
40: internal core
41: body 42: smooth surface
43: Lower part of the round bottom 44:
50: lower mold 51: cavity
60: Upper mold

Claims (12)

A fiber-reinforced skin comprising at least one layer of fibrous fabric pieces, and an assembly frame formed integrally with the bottom inner region adjacent to the edge of the fiber-reinforced skin and having at least one opening in the center thereof. And, the thickness of the fiber-reinforced skin is 0.2 ~ 0.5mm in the case of a mobile phone and 0.4 ~ 0.8mm in the case of a notebook, the manufacturing method of the mobile device exterior case consisting of the following steps:
(A) providing an assembly frame having at least one opening in the center;
(B) positioning the inner core inside the assembly frame as described above, placing at least one layer of fiber fabric piece on the bottom of the assembly frame, and one layer on the upper surface of the inner core. Combining the upper and lower molds with the fiber fabric pieces positioned;
(C) simultaneously performing Resin Transfer Molding (RTM) and Insert Molding (Insert Molding) to perform molding of the fiber-reinforced skin in which the assembly frame is integrated; And
(D) taking out the inner core by cutting and removing the fiber reinforced skin on the upper surface of the inner core surrounding the inner core, leaving only the rim. The method according to claim 1, wherein in step (A), a reinforcing frame is provided together with the reinforcing frame, and in step (B), an inner core is placed inside the reinforcing frame and the reinforcing frame. A manufacturing method of an exterior case for a mobile device in which an upper and lower molds are combined. The exterior of a mobile device according to claim 2, wherein the battery cover or the window for the camera or the opening for the speaker is also cut from the fiber-reinforced skin of the bottom of the inner core surrounding the inner core in the step (D). Manufacturing method of the case. The method for manufacturing an exterior case for a mobile device according to claim 2, further comprising the step (D) followed by (E) polishing of the outer surface or the inner and outer surfaces of the fiber reinforced skin. The method of manufacturing an exterior case for a mobile device according to claim 4, further comprising (F) performing top coating for imparting scratch resistance after the step (E). The method of manufacturing an exterior case for a mobile device according to claim 1 or 2, wherein the speaker grill unit or a plurality of fixing units are integrally formed in the above-mentioned step (A). The method for manufacturing an exterior case for a mobile device according to claim 1 or 2, wherein the speaker grill part or a plurality of fixing parts are placed as separate members in the assembly frame in the step (B). The method of manufacturing an exterior case for a mobile device according to claim 4, wherein the speaker grill portion or the plurality of fixing portions are assembled to the assembling frame as a separate member after the step (E). The method for manufacturing an exterior case for a mobile device according to claim 5, wherein the speaker grill portion or a plurality of fixing portions are assembled to the assembling frame as a separate member following the above step (F). The mobile device according to claim 1 or 2, wherein at least one antenna is positioned between the inner surface or the outer surface of the fiber reinforced fabric piece of the inner core bottom or the fiber reinforced fabric piece in the step (B). Method of manufacturing an outer case. The method for manufacturing an exterior case for a mobile device according to claim 1 or 2, wherein a carrier including a logo portion or a character portion is placed on the outer surface of the fiber reinforced fabric piece of the inner core bottom surface in the step (B). . The fabric of claim 1 or 2, wherein the at least one layer of fiber fabric piece is a woven or non-fabric fabric piece made of an inorganic fiber, an organic fiber, or a hybrid fiber thereof. Method of manufacturing an outer case for a mobile device is formed so that the fiber-reinforced skin has a tensile strength of 500 ~ 2000kg / cm ² .

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