WO2022065801A1

WO2022065801A1 - Cover member for protective case, and method for manufacturing same

Info

Publication number: WO2022065801A1
Application number: PCT/KR2021/012672
Authority: WO
Inventors: 오춘택
Original assignee: 주식회사 노바텍
Priority date: 2020-09-25
Filing date: 2021-09-16
Publication date: 2022-03-31
Also published as: CN114929063A; KR102240173B1

Abstract

The present invention relates to a cover member for a protective case and a method for manufacturing same. Specifically, the present invention relates to a cover member for a protective case and a method for manufacturing same, wherein the cover member has light weight, high hardness, and high strength, and also is excellent in bending properties and has a wide size, a thin thickness, and a three-dimensional shape.

Description

Cover member for protective case and manufacturing method thereof

The present invention relates to a cover member for a protective case and a method for manufacturing the same.

Recently, the use of mobile devices such as smartphones and tablet PCs is rapidly increasing, and accordingly, the demand for protective cases for preventing damage such as damage or scratches on mobile devices is also increasing.

In general, the protective case includes a front cover and a rear cover, each cover includes an outer shell and an endothelium, and a cover plate inserted between the outer shell and the endothelium.

In order to implement a three-dimensional shape in such a protective case, conventionally, the cover plate has been manufactured from a synthetic resin by an injection molding method or a fiber-reinforced composite material by a machining method.

Among them, the cover plate made of the fiber-reinforced composite material by the machining method could be manufactured to be lighter and thinner than the injection molding method, but there was a problem in that the manufacturing cost increased due to the increase in the processing time of the processing machine for realizing a three-dimensional shape. . Accordingly, the conventional injection molding method is mainly adopted and used to manufacture the cover plate despite having disadvantages such as increased thickness and weight of the cover plate.

However, when the cover plate is made thin and wide by using the injection molding method, the bending characteristics of the cover plate are deteriorated, and the thickness thereof is also thick, about 2 mm or more. In addition, there is a limit to the aesthetics because the pushpin marks remain on the exterior of the cover plate.

In order to solve this problem, conventionally, a cover plate having an injection product of a predetermined shape has been manufactured by injecting a synthetic resin in a state in which a plate-shaped prepreg is mounted in an insert molding mold. However, in this case, the yield is low due to the thickness deviation of the prepreg, and in particular, the manufacturing cost is increased because the cover plate itself must be discarded when a defect occurs. In addition, the appearance of the cover plate still remains, so there is a limit to the aesthetics.

It is an object of the present invention to provide a cover member for a protective case having a three-dimensional shape as well as light weight, high hardness and high strength, as well as excellent bending properties, a large size and a thin thickness, and a method for manufacturing the same.

In order to achieve the above object, the present invention is a first plate comprising a first insert; an implant in which at least a portion is inserted into the first insertion part; a second plate disposed on an upper surface of the first plate and including a first through hole; a first adhesive sheet interposed between the first plate and the second plate and including a second through hole; a third plate disposed on a lower surface of the first plate; and a second adhesive sheet interposed between the first plate and the third plate, wherein the prosthesis includes a locking protrusion protruding from an outer circumferential surface to be supported inside the first insertion part, and an upper end of the first through hole It provides a cover member for a protective case that is arranged to extend to the side.

The lower end of the prosthesis may be supported by the first insertion unit.

In addition, the lower end of the prosthesis may be disposed through the first insertion portion.

In addition, the prosthesis may further include at least one of a third through hole and a groove portion.

In addition, the material of the implant may be a metal or a polymer. Such an implant may be an injection-molded article.

In addition, the first plate may have a smaller specific gravity than the second plate.

In addition, the third plate may have a greater specific gravity than the first plate.

In addition, the third plate includes a fourth through-hole having a shape corresponding to the shape of the prosthesis at a position corresponding to the position of the first insertion part, and the second adhesive sheet has a position corresponding to the position of the first insertion part. A fifth through-hole having a shape corresponding to the shape of the prosthesis may be included at the position.

In addition, the cover member may further include a magnetic member. In this case, the first plate further includes a second insertion part for inserting the magnetic member.

In addition, the present invention comprises the steps of (S100) forming an implant including a protruding protrusion formed on the outer peripheral surface; (S200) forming a first insertion part for inserting the prosthesis into the first plate; (S300) inserting the prosthesis into the first insertion portion of the first plate; (S400) forming a second through hole in the first adhesive sheet; (S500) forming a first through hole in the second plate; and (S600) sequentially stacking the first adhesive sheet and the second plate on one surface of the first plate, and sequentially stacking and laminating the second adhesive sheet and the third plate on the other surface of the first plate. It provides a method of manufacturing a cover member for a protective case comprising the step.

In the step (S100A), a polymer or metal may be injected into an injection mold to form the implant.

The prosthesis may further include at least one of a third through hole and a groove portion.

In the step (S600), heat compression may be performed at a temperature of about 80 to 200 °C.

In addition, in the step (S200), when the first inserting part is formed, a second inserting part into which the magnetic member is inserted may be further formed. In this case, in the step (S300), the magnetic member is inserted into the second insertion part when the prosthesis is inserted.

Since the cover member according to the present invention includes an implant having a predetermined shape, not only light weight, high hardness and high strength, but also excellent bending properties, a large size and a thin thickness, and a three-dimensional shape may be obtained. Accordingly, the cover member of the present invention is applied as at least a portion of the front and/or rear cover of the protective case for mobile devices, and not only gives the protective case a three-dimensional shape, but also improves the durability of the protective case, and further It can prevent damage such as breakage or scratching of mobile devices.

1 is a perspective view schematically showing a cover member for a protective case according to a first embodiment of the present invention.

2 is an exploded perspective view schematically illustrating a cover member for a protective case according to the first embodiment of the present invention.

3 is a cross-sectional view taken along line A-A of FIG. 1 .

4 (a) and 4 (b) are perspective views showing an embodiment of the first plate according to the present invention, respectively.

5 (a) to 5 (c) are perspective views showing an embodiment of the prosthesis according to the present invention, respectively.

6 is a perspective view schematically illustrating a cover member for a protective case according to a second embodiment of the present invention.

7 is an exploded perspective view schematically illustrating a cover member for a protective case according to a second embodiment of the present invention.

8 is a cross-sectional view taken along line A-A of FIG. 6 .

9 is a flowchart illustrating a process of manufacturing a cover member for a protective case according to the first embodiment of the present invention.

10 is a flowchart illustrating a process of manufacturing a cover member for a protective case according to a second embodiment of the present invention.

*** Explanation of symbols ***

100: a cover member, 110: a first plate,

111: a first insertion part, 111A: a first insertion hole,

111B: first insertion groove, 111a: stepped,

112: second insertion part, 120: implant,

121: a locking protrusion, 122A: a third through hole,

122B: groove portion, 130: second plate,

131: a first through hole, 140: a first adhesive sheet,

141: second through hole, 150: third plate,

151: a fourth through hole, 160: a second adhesive sheet;

161: fifth through hole, 170: magnetic member

Hereinafter, the present invention will be described with reference to the drawings.

1 and 6 are perspective views schematically showing a cover member for a protective case according to the first and second embodiments of the present invention, respectively, and FIGS. 2 and 7 are protection according to the first and second embodiments of the present invention, respectively. It is an exploded perspective view schematically showing a cover member for a case, FIG. 3 is a cross-sectional view taken along line AA of FIG. 1 , and FIG. 8 is a cross-sectional view taken along line AA of FIG. 6 .

1 to 8 , the

cover members

100A and 100B for a protective case of the present invention are a cover member constituting a protective case for preventing damage to a mobile device, and include a first insertion part 111 . 1 plate 110; an implant 120 having at least a part inserted into the first plate 110; a first adhesive sheet 140 and a second plate 130 sequentially disposed on one surface of the first plate 110 ; and a second adhesive sheet 160 and a third plate 150 sequentially disposed on the other surface of the first plate 110 . In this case, the prosthesis 120 includes a locking protrusion 121 protruding from an outer circumferential surface to be supported inside the first insertion part 111 , and an upper end of the first through hole 131 of the second plate 130 . ) is extended to the side. Accordingly, the cover member for a protective case according to the present invention can implement a thin and uniform thickness due to excellent bending characteristics. Optionally, as shown in FIGS. 6 to 8 , the cover member 100B for a protective case of the present invention may further include a magnetic member 170 . In this case, the first plate 110 may further include a second insertion part 112 for inserting the magnetic member 170 .

Hereinafter, the cover member 100A for a protective case according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 5 .

(1) first plate

In the cover member 100A for a protective case of the present invention (hereinafter, 'cover member'), the first plate 110 is a base portion of the cover member, and includes a first insertion part 111 .

The first insertion part 111 is a part for inserting at least a part of the prosthesis 120, and the prosthesis 120 is supported and fixed therein, thereby preventing the prosthesis 120 from swinging from side to side or from leaving. there is.

According to an example, the first insertion part 111 may be a first insertion hole 111A, as shown in FIG. 4A . In this case, the implant 120 may be disposed through the first insertion part 111 of the first plate 110 , that is, the first insertion hole 111A, in which case the lower end of the implant 120 is the first It may protrude to the outside of the insertion hole 111A.

According to another example, the first insertion part 111 may be a first insertion groove 111B as shown in FIG. 4(b) . In this case, the implant 120 may be seated inside the first insertion groove 111B of the first plate 110 .

The shape of the first insertion part 111 may be formed to surround the circumference of the implant 120 . Accordingly, the shape of the first insertion part 111 may vary according to the shape of the implant 120 . For example, when the outer shape of the prosthesis 120 is elongated in a direction crossing the AA axis direction, the shape of the first insertion part 111 surrounding the perimeter of the prosthesis 120 is also elongated in the direction intersecting the AA axis direction. has In addition, the size of the first insertion part 111 also varies depending on the size of the implant.

As shown in FIG. 3 , the first insertion part 111 may further include a step 111a formed along the upper inner surface. The step 111a may support the locking protrusion 121 of the implant 120 . The step 111a may support the prosthesis 120 upward while abutting the edge of the lower surface of the protrusion 121 of the prosthesis.

The material of the first plate 110 usable in the present invention is not particularly limited as long as it has high hardness and high strength in general in the art, and may be, for example, a polymer, a prepreg, or the like.

The polymer usable in the present invention is not particularly limited, such as a thermoplastic or thermosetting polymer, and for example, an epoxy-based polymer, a polyurethane-based polymer, a polyamide-based polymer, a polyalphaolefin-based polymer, a vinyl-based polymer, an acrylic polymer, a polyacetal-based polymer, Polyether polymer, polyester polymer, polyether sulfone polymer, polysulfide polymer, polyimide polymer, polypeptide polymer, polyketone polymer, polyolefin polymer, polyimide polymer, vinylidine polymer, these of copolymers, etc., which may be used alone or in combination of two or more.

According to one example, the material of the first plate 110 may be an epoxy-based polymer. In this case, since the bending strength of the first plate 110 is improved, the cover member 100A of the present invention may have light weight, high hardness, and high strength.

The epoxy-based polymer usable in the present invention is a polymer containing at least one epoxy group in a molecule, and is preferably an epoxy resin that does not contain a halogen atom such as bromine in the molecule. In addition, the epoxy-based polymer may contain not only silicone, urethane, polyimide, polyamide, etc. in the molecule, but also a phosphorus atom (P), a sulfur atom (S), a nitrogen atom (N), etc. in the molecule. .

The type of the epoxy-based polymer is not particularly limited, and for example, bisphenol A-type epoxy resin, bisphenol F-type epoxy resin, or hydrogenated ones thereof, phenol novolak-type epoxy resin, cresol novolac-type epoxy resin, etc. glycidyl ether-based epoxy resins; glycidyl ester-based epoxy resins such as hexahydrophthalic acid glycidyl ester and dimer acid glycidyl ester; glycidylamine-based epoxy resins such as triglycidyl isocyanurate and tetraglycidyl diamino diphenylmethane; and linear aliphatic epoxy resins such as epoxidized polybutadiene and epoxidized soybean oil, preferably bisphenol A type epoxy resin, bisphenol F type epoxy resin, phenol novolak type epoxy resin, cresol novolak type epoxy resin, biphenyl ( Biphenyl) type epoxy resin, polyfunctional epoxy (Epoxy) resin, and the like. These may be used alone, or two or more may be used in combination.

The prepreg usable in the present invention includes a fiber base and a polymer impregnated in the fiber base, and is in a cured state to B-stage (semi-cured state). When this prepreg is applied to the first plate, it may be cured into a sheet shape to become a fiber-reinforced composite material sheet.

In the prepreg, examples of polymers are not particularly limited, and epoxy-based polymers, polyurethane-based polymers, polyamide-based polymers, polyalphaolefin-based polymers, vinyl-based polymers, acrylic polymers, polyacetal-based polymers, polyether-based polymers, Polyester polymers, polyethersulfone polymers, polysulfide polymers, polyimide polymers, polypeptide polymers, polyketone polymers, polyolefin polymers, polyimide polymers, vinylidine polymers, copolymers thereof, etc. However, these may be used alone or in combination of two or more. Among them, in the case of the epoxy-based polymer, the curing rate is fast when the first plate is manufactured, so that productivity can be improved, and thermal stability and chemical stability of the cover member can be improved.

In addition, in the prepreg, the fiber base can improve the strength of the support plate. Examples of such a fiber substrate include yarn, woven fabric, knitting, braid, and the like. The material (fiber) of the fiber base is not particularly limited, and non-limiting examples include vegetable fibers such as cotton and hemp; animal fibers such as wool, silk, and the like; recycled fibers such as rayon and the like; synthetic fibers such as polyester, acrylic, nylon, polyurethane and the like; There are inorganic fibers such as glass fibers and carbon fibers, metal fibers, and the like, and these may be used alone or in combination of two or more. Among them, in the case of inorganic fibers such as glass fiber and carbon fiber, since the moisture content is low, pores in the first plate are not formed during subsequent curing, and thermal stability is also excellent. Therefore, when the fabric made of inorganic fibers is used, the strength and thermal stability of the final cover member may be improved.

According to an example, the first plate 110 may be a fiber-reinforced composite material sheet in which a prepreg (eg, a prepreg containing an epoxy resin-based polymer, etc.) is cured.

The specific gravity of the first plate 110 is not particularly limited, and may be, for example, about 1.4 or less, specifically, about 0.8 to about 1.4. The first plate 110 may have the same specific gravity as the second plate 120 or different. According to one example, the first plate 110 may have a smaller specific gravity than the second plate 120 .

The thickness of the first plate 110 is not particularly limited, but if the thickness is too thin, the rigidity is too small and there is a risk of permanent damage such as deformation. there is Therefore, it may be appropriate to adjust the thickness of the first plate 110 in the range of about 0.5 to 2 mm.

(2) implants

The cover member 100A according to the present invention includes an implant 120 . The prosthesis 120 may give a three-dimensional shape to the cover member 100A according to a design. Because of the implant 120, there is no need to implement the first plate 110 and the second plate 130 in a three-dimensional shape, the first plate 110 and the second plate 130 have a wide size and thin thickness. can have Accordingly, unlike the conventional cover member, the cover member 100A of the present invention has a light weight, high hardness, and high strength, as well as a wide size and a thin thickness, and may have various three-dimensional shapes.

At least a portion of the prosthesis 120 is inserted into and supported by the first inserting part 111 of the first plate 110 , and thus may be fixed by the first inserting part 111 .

The prosthesis 120 includes a locking protrusion 121 protruding from the outer circumferential surface so as to be supported on the inside of the first insertion part 111 . At this time, the locking protrusion 121 is formed to extend on the outer circumferential surface of the implant 120 . Specifically, the locking protrusion 121 is seated on the step 111a of the first plate 110 , while the second through hole 141 of the first adhesive sheet 140 and the first through hole of the second plate 130 are seated. By being caught by the 131 , the implant 120 may not be separated from the first insertion part 111 of the first plate 110 .

In addition, the upper end of the implant 120 is disposed to extend toward the first through-hole 131 of the second plate 130 . According to an example, the upper end of the implant 120 may be disposed to penetrate the first through hole 131 of the second plate 130 (refer to FIG. 3 ). At this time, depending on the shape to be implemented, the upper end of the implant 120 may protrude to the outside of the first through hole 131 .

Also, the lower end of the prosthesis 120 may be supported by the first inserting part 111 or may be disposed through the first inserting part 111 .

Specifically, when the first insertion portion 111 of the first plate 110 is the first insertion hole 111A, the lower end of the implant 120 is the first insertion portion 111 , that is, the first insertion hole 111A. ) may be disposed through (see FIG. 3). At this time, depending on the shape to be implemented, the lower end of the implant 120 may penetrate not only the first insertion hole 111A but also the fourth through hole 151 of the third plate 150 to protrude to the outside. On the other hand, as shown in Figure 4 (b), when the first insertion portion 111 of the first plate 110 is the first insertion groove (111B), the lower end of the implant 120 is a first insertion groove ( 111B) is inserted and seated.

The prosthesis 120 may further include at least one of the third through hole 122A and the groove portion 122B, or may have a shape 122D that does not include the third through hole and the groove portion 122D. There is (see Fig. 5).

Specifically, as shown in FIG. 5A , the implant 120 may include one or a plurality of third through-holes 122A. The third through hole 122A may be used as a space for storing the smart pen of the mobile device protected by the protective case depending on its size or location, or may expose the camera of the mobile device protected by the protective case to the outside. can do it

Also, as shown in FIG. 5B , the implant 120 may include one or a plurality of grooves 122B. The groove 122B may be used as a space for storing a smart pen of a mobile device protected by a protective case according to its size or location.

Also, as shown in FIG. 5C , the implant 120 may include one or a plurality of third through-holes 122A and one or a plurality of groove portions 122B.

Of course, as shown in FIG. 5(d) , the implant 120 may have a shape 122C protruding upward without the third through hole 122A or the groove portion 122B being formed. In this case, the upper end of the implant 120 passes through the first through hole 131 and protrudes to the outside, thereby giving the cover member a three-dimensional shape.

The thickness of the implant 120 is not particularly limited, and may be adjusted according to the shape of the cover member to be implemented. For example, the thickness of the prosthesis 120 is the depth d ₁ of the first insertion part 111 of the first plate 110 , the thickness d ₂ of the first adhesive sheet 140 , and the thickness of the second plate 130 . It may be equal to or greater than the sum of the thicknesses (d ₃ ) (d ₁ +d ₂ +d ₃ ).

The material of the aforementioned implant 120 is not particularly limited, and for example, ABS resin (acrylonitrile-butadiene-styrene resin), epoxy resin, polycarbonate, polyurethane, thermoplastic polyurethane, polyamide, polyolefin, polyalphaolefin, polychloride polymers such as vinyl, acrylic resin, acetal resin, polyether, polyester, polyethersulfone, polysulfide, polyimide, polyketone, polyimide and the like; metals such as aluminum, aluminum alloys, and the like, but are not limited thereto. However, in terms of heat resistance, it is appropriate to form the implant with a polymer or metal having excellent heat resistance.

The implant 120 may be an injection-molded body formed of the above-described material. In particular, the implant 120 may be a heat-resistant injection molding formed of a heat-resistant polymer. The prosthesis 120 may have various shapes depending on the design.

(4) second plate

The cover member 100A according to the present invention includes a second plate 130 . The second plate 130 is disposed on the first adhesive sheet 140 and is attached to the first plate 110 by the first adhesive sheet 140 . The second plate 130 may reinforce the appearance and mechanical properties of the first plate 110 .

As shown in FIG. 2 , the second plate 130 of the present invention includes a first through hole 131 . The first through-hole 131 is formed at a position corresponding to the position of the first insertion part 111 of the first plate 110 , similarly to the second through-hole 141 of the first adhesive sheet 140 . and has a shape corresponding to the shape of the implant 120 excluding the locking protrusion 121 .

In this case, the size of the first through hole 131 (ie, the length in the X-axis direction and the length in the Y-axis direction) may be the same as or larger than the size of the implant 120 excluding the locking protrusion 121 . However, the size of the first through hole 131 is smaller than the size of the implant 120 including the locking protrusion 121 .

The material of the second plate 130 may be the same as or different from the material of the first plate 110 . Since a specific example thereof is the same as described in the first plate 110 part, it is omitted. According to one example, the material of the second plate 130 may be a polymer, specifically, an epoxy-based polymer.

The thickness of the second plate 130 is not particularly limited, and may be, for example, in the range of 0.05 to 0.2 mm.

The second plate 130 may have the same specific gravity as the first plate 110 , or may have a higher specific gravity than the first plate 110 . According to one example, the specific gravity of the second plate 130 may be in the range of about 1.2-2, specifically, about 1.4-2.

(4) first adhesive sheet

The cover member 100A according to the present invention includes a first adhesive sheet 140 . The first adhesive sheet 140 is disposed on one surface (eg, an upper portion) of the first plate 110 .

Specifically, the first adhesive sheet 140 is interposed between the first plate 110 and the second plate 130 disposed to face each other. Accordingly, the first plate 110 , the implant 120 inserted into the first insertion part 111 of the first plate 110 , and the second plate 130 are adhered to each other by the first adhesive sheet 140 . can be integrated. In particular, the implant 120 is integrated into the first plate 110 by the first adhesive sheet 140 in a state of being inserted into the first insertion part 111 of the first plate 110 .

As shown in FIG. 2 , the first adhesive sheet 140 includes a second through hole 141 . The second through-hole 141 is formed at a position corresponding to the position of the first insertion part 111 of the first plate 110, and a shape corresponding to the shape of the implant 120 except for the locking protrusion 121 is formed. have

In this case, the size of the second through hole 141 (ie, the length in the X-axis direction and the length in the Y-axis direction) may be the same as or larger than the size of the implant 120 excluding the locking protrusion 121 . However, the size of the second through hole 141 is smaller than the size of the implant 120 including the locking protrusion 121 . Here, the X-axis direction is a direction perpendicular to the line A-A of FIG. 1 , and the Y-axis direction is a direction parallel to the line A-A of FIG. 1 .

The first adhesive sheet 140 usable in the present invention may be a hot melt adhesive sheet or a prepreg, or may be alternately laminated one or more times. Even if both the hot melt adhesive sheet and the prepreg have a wide attachment surface, the adherends can be uniformly attached without defects such as air bubbles.

The hot melt adhesive sheet is not particularly limited as long as it is a hot melt adhesive sheet (or film) generally known in the art, and may be, for example, a thermoplastic adhesive sheet, specifically vinyl acetate, polyvinyl alcohol, vinyl chloride, polyvinyl acetal. There are adhesive sheets, acrylic, polyester, polyamide, polyethylene, and the like, but is not limited thereto.

The prepreg is not particularly limited as long as it is a sheet obtained by impregnating a fiber base with a polymer and curing it to a B-stage (semi-cured state).

In the prepreg, examples of usable polymers are not particularly limited, and epoxy-based polymers, polyurethane-based polymers, polyamide-based polymers, polyalphaolefin-based polymers, vinyl-based polymers, acrylic polymers, polyacetal-based polymers, and polyether-based polymers Polymers, polyester polymers, polyethersulfone polymers, polysulfide polymers, polyimide polymers, polypeptide polymers, polyketone polymers, polyolefin polymers, polyimide polymers, vinylidine polymers, copolymers thereof and the like, and these may be used alone or in combination of two or more. Among them, in the case of the epoxy-based polymer, the curing rate is fast during the manufacture of the cover member, so that productivity can be improved, and thermal stability and chemical stability of the cover member can be improved.

Examples of the fiber substrate usable in the present invention include yarn, woven fabric, knitting, braid, and the like. The material (fiber) of the fiber base is not particularly limited, and non-limiting examples include vegetable fibers such as cotton and hemp; animal fibers such as wool, silk, and the like; recycled fibers such as rayon and the like; synthetic fibers such as polyester, acrylic, nylon, polyurethane and the like; There are inorganic fibers such as glass fibers and carbon fibers, metal fibers, and the like, and these may be used alone or in combination of two or more. Among them, in the case of inorganic fibers such as glass fibers and carbon fibers, the strength and thermal stability of the cover member may be improved.

The thickness of the first adhesive sheet 140 is not particularly limited, and may be, for example, about 0.03 to 0.1 mm, specifically, about 0.05 to 0.07 mm.

(6) third plate

The cover member 100A according to the present invention includes a third plate 150 . The third plate 150 is disposed on the other surface (eg, the lower portion) of the first plate 110 , and may reinforce the appearance of the cover member 100A while reinforcing mechanical properties of the first plate 110 . .

The third plate 150 may or may not include the fourth through hole 151 depending on the size (eg, height) of the implant 120 . If the third plate 150 includes the fourth through hole 151 , the lower end of the implant 120 may be disposed to penetrate the fourth through hole 151 of the third plate 150 .

The fourth through-hole 151 is formed at a position corresponding to the position of the first insertion part 111 of the first plate 110 , and has a shape corresponding to the shape of the prosthesis 120 excluding the locking protrusion. In this case, the size of the fourth through-hole 151 (ie, the length in the X-axis direction and the length in the Y-axis direction) may be the same as or larger than the size of the implant 120 excluding the locking protrusion. However, the size of the fourth through hole 151 is smaller than the size of the implant 120 including the locking protrusion 121 .

The specific gravity of the third plate 150 is not particularly limited. According to one example, the specific gravity of the third plate 150 may be greater than that of the first plate 110 . Specifically, the specific gravity of the third plate 150 may be in the range of 1.2 to 2, more specifically, in the range of about 1.4 to 2.

In addition, the thickness of the 3rd plate 150 is not specifically limited. According to an example, the thickness of the third plate 150 may be thinner than the thickness of the first plate 110 , and specifically may be in the range of about 0.05 to 0.2 mm.

The material of the third plate 150 may be the same as or different from those of the first and

second plates

110 and 130, respectively. Since a specific example thereof is the same as described in the first plate 110 part, it is omitted. According to one example, the material of the third plate 150 may be a prepreg, specifically, a prepreg containing an epoxy-based polymer.

(7) second adhesive sheet

The cover member 100A of the present invention includes the second adhesive sheet 160 . The second adhesive sheet 160 is interposed between the first plate 110 and the third plate 150 , and the third plate 150 may be laminated to the first plate 110 .

The second adhesive sheet 160 may or may not include the fifth through hole 161 depending on the shape of the implant 120 . That is, when the lower end of the implant 120 passes through the fourth through hole 151 of the third plate 150 , the second adhesive sheet 160 includes the fifth through hole 161 .

The fifth through-hole 161 is formed at a position corresponding to the position of the first insertion part 111 of the first plate 110 , and has a shape corresponding to the shape of the prosthesis 120 excluding the locking protrusion. In this case, the size of the fifth through-hole 161 (ie, the length in the X-axis direction and the length in the Y-axis direction) may be the same as or larger than the size of the implant 120 excluding the locking protrusion. However, the size of the fifth through hole 161 is smaller than the size of the implant 120 including the locking protrusion 121 .

Like the first adhesive sheet 140 , the second adhesive sheet 160 may be a hot melt adhesive sheet or a prepreg. According to an example, the second adhesive sheet 160 may be a hot melt adhesive sheet.

Since the description of the hot melt adhesive sheet and the prepreg is the same as that described in the first adhesive sheet part, it is omitted.

The thickness of the second adhesive sheet is not particularly limited, and may be, for example, about 0.03 to 0.15 mm. For example, when the second adhesive sheet is a hot melt adhesive sheet, the thickness of the second adhesive sheet may be about 0.03 to 0.07 mm. As another example, when the second adhesive sheet is a prepreg, the thickness of the second adhesive sheet may be about 0.05 to 0.15 mm. In this case, the specific gravity of the second adhesive sheet is not particularly limited, and may be, for example, in the range of 0.8 to 2.

Hereinafter, a cover member 100B for a protective case according to a second embodiment of the present invention will be described with reference to FIGS. 6 to 8 .

As shown in FIGS. 6 to 8 , the cover member 100B for a protective case according to the second embodiment of the present invention includes a first plate ( 110); an implant 120 having at least a part inserted into the first insertion part 111; a magnetic member 170 inserted into the second insertion part 112; a second plate 130 disposed on one surface of the first plate 110 and including a first through hole 131; and a second adhesive sheet 140 interposed between the first plate 110 and the second plate 130 and including a second through hole 141 , wherein the implant 120 is the first It includes a locking protrusion 121 protruding from an outer circumferential surface so as to be supported inside the insertion portion 111 , and an upper end thereof is disposed to extend toward the first through hole 131 .

Descriptions of the implant 120 , the second plate 130 , the first adhesive sheet 140 , the third plate 150 , and the second adhesive sheet 160 are the same as those described in the first embodiment, and thus are omitted. do.

The first plate 110 includes a first inserting part 111 for inserting at least a portion of the implant 120 and a second inserting part 112 for inserting the magnetic member 170 . Here, the description of the first plate 110 except for the description of the second insertion part 112 is omitted because it is the same as that described in the first embodiment.

The second insertion part 112 may be at least one of a second insertion groove and a second insertion hole. Specifically, the second insertion part 112 may contain one or more second insertion grooves and/or one or more second insertion holes. The shape, size, and number of the second insertion parts 112 may be adjusted according to the shape, size, and number of the magnetic member. Since the magnetic members 170 are respectively seated in the second insertion part 112 , it is possible to prevent the magnetic members 170 from being separated from the first plate 110 .

According to an example, as shown in FIG. 8 , the second insertion part 112 may be a plurality of second insertion grooves. In this case, the plurality of second insertion grooves may be arranged to be spaced apart on one surface of the first plate 110 along one direction of the first plate 110 (see FIG. 8 ). Alternatively, the plurality of second insertion grooves are one or a plurality of 2A insertion grooves arranged to be spaced apart on one surface of the first plate 110 , and one or a plurality of 2B insertion grooves arranged to be spaced apart from the other surface of the first plate 110 . It may include grooves. In this case, the 2A insertion groove and the 2B insertion groove may be alternately arranged with each other. In particular, when the 2A insertion groove and the 2B insertion groove are alternately arranged with each other, the residual stress of the first plate 110 can be distributed to both sides of the first plate (ie, the upper surface and the lower surface). The bending characteristics of the cover member 100A according to the present invention may be further improved. However, when the magnetic member 170 is respectively inserted into the insertion groove 2A and the insertion groove 2B, it is appropriate to insert the magnetic member 170 by adjusting the pole directions to be in the same direction. In particular, when the magnetic member 170 is a shielding magnet, it is inserted by adjusting the insertion direction of the shielding magnet so that the magnetic force in a desired direction is shielded. Accordingly, when the cover member of the present invention is applied to a protective case of a portable device, the cover and the body of the case can be easily detached from each other.

The depth of the second insertion groove (112A) is not particularly limited, for example, the difference (t ₁ -d ₁ ) between the thickness (t ₁ ) of the first plate and the depth (d ₁ ) of the second insertion groove is about 0.1 mm or less , specifically 0.01 to 0.1 mm. In this case, without separation of the magnetic member 170 inserted into the second insertion groove 112A, the weight of the first plate may be reduced to reduce the weight of the Kebu member 100B itself. If the plurality of second insertion grooves include the 2A insertion groove and the 2B insertion groove, their depths may be the same or different from each other.

The cover member 100B according to the present invention includes a magnetic member 170 . The magnetic member 170 is a part that actually attaches and detaches the cover of the protective case to the screen part of the mobile device or the case body. One or a plurality of such magnetic members 170 may be inserted into the second insertion part 112 of the first plate 110 and fixed to the first plate 110 . In this case, when the magnetic member 170 is inserted into the second inserting part 112 , it may be fixed to the inside of the second inserting part 112 by an adhesive or an adhesive. In addition, since the magnetic member 170 is compressed or adhered by the second and

third plates

130 and 150 while being inserted into the second inserting part 112 , the second inserting part does not need a separate adhesive or adhesive. Deviation from 112 can be prevented.

The magnetic member 170 usable in the present invention is not particularly limited as long as it is used in a protective case in the art, and may be, for example, a permanent magnet, a shielding magnet, a magnetic material, or the like.

Here, the permanent magnet is unipolar; Alternatively, it may be a multipole magnet in which at least two or more N-pole and S-pole patterns are formed through multipolar magnetization.

In addition, when the magnetic member 170 is a shielding magnet, it includes a magnetic portion 171; and a shielding part 172 for shielding the magnetic force of at least one side of the magnetic part 131 (see FIG. 6 ). In this case, the magnetic part may be a permanent magnet (eg, a single-pole magnet, a multi-pole magnet) or a magnetic material. In addition, the shielding part shields the magnetic force in at least one direction among the magnetic forces of the magnet to strengthen the magnetic force in the unshielded direction, and the shape or size of the shielding part is designed according to the type, shape, size, magnetic force, shielding direction, etc. of the magnetic part. can A magnetic material with high magnetic permeability is used as a material for such a shield, for example, a carbon steel sheet (eg, S45C, etc.), a stainless steel sheet (eg, SUS430, SUS304, etc.), a free-cutting steel sheet (eg, SUM21, SUM22). , SUM22L, SUM23, SUM24L, SUM31, SUM41, SUM43, etc.), cold rolled carbon steel sheet (SPCC), hot rolled carbon steel sheet, and steel sheets such as silicon steel sheet. In addition, a plated steel sheet obtained by electrolytic plating or electroless plating of the steel sheet with a (semi)metal or alloy such as nickel, zinc, copper, etc. , electrolytic galvanized iron (EGI), zinc aluminum alloy coated steel sheets, hot-dip galvanized steel sheet, electrolytic nickel plated steel sheet, electroless nickel plated steel sheet, copper plated steel sheet, and the like. In addition, the shape of the shield may be a plate shape, a tube shape, a column shape with an open top (eg, a U-shaped vertical cross-section), and the like. In this case, the shielding part may have a shape in which one or more of a plate shape, a tube shape, and a pillar shape with an open top are combined. For example, the shielding part may be of a form in which a ring-shaped shielding part and a plate-shaped shielding part are assembled and integrated. Also, the shielding part may be a plate-shaped upper shielding part and a plate-shaped lower shielding part.

When the magnetic member 170 is a magnetic material, it is necessary to perform a magnetization process for applying a magnetic force after assembling each component of the cover member.

Hereinafter, FIG. 9 is a flowchart showing a process of manufacturing the above-described cover member 100A according to the first embodiment of the present invention, wherein the cover member 100A of the present invention includes a locking protrusion protruding from the outer circumferential surface (S100A) forming a prosthesis; (S200A) forming a first insert for inserting the prosthesis into the first plate; (S300A) inserting the prosthesis into the first insertion portion of the first plate; (S400A) forming a first through hole in the second plate; (S500A) forming a second through hole in the first adhesive sheet; and (S600A) sequentially stacking the first adhesive sheet and the second plate on one surface of the first plate, and sequentially stacking and laminating the second adhesive sheet and the third plate on the other surface of the first plate It may be prepared by a method comprising the steps. However, it is not limited only by the manufacturing method, and the steps of each process may be modified or selectively mixed as needed. In particular, there is no temporal precedence between steps (S100A) and (S200A), and there is no temporal precedence between steps (S300A), (S400A) and (S500A).

Hereinafter, each step of manufacturing the cover member 100A according to the present invention will be described with reference to FIG. 9 .

(1) (S100A) step: formation of an implant

The prosthesis 120 including the locking protrusion 121 protruding from the outer circumferential surface is formed.

The method for forming the implant is not particularly limited as long as it is a method capable of forming a molded body having a three-dimensional shape in the art, and for example, there are injection molding methods and 3D printing methods, but is not limited thereto.

According to an example, the implant 120 is formed by injecting (injecting) a molten polymer (eg, epoxy-based polymer) (or molten metal) into an injection mold, and then cooling the polymer (or metal) to cure it into a molded body of a predetermined shape. to form At this time, the shape of the cavity in the injection mold is designed according to the shape of the implant 120 .

The formed implant 120 is an injection-molded product having a predetermined shape, and includes a locking protrusion 121 extending and protruding from an outer circumferential surface, and at least one of a third through hole 122A and a groove portion 122B according to the design of the cover member. It may include one more. In addition, the prosthesis 120 may not include the third through hole 122A and the groove portion 122B.

(2) (S200A) step: formation of the first insert on the first plate

A first insertion part 111 for inserting the implant 100 into the first plate 110 is formed.

For example, the first plate 110 is manufactured by processing a plate formed of a polymer (eg, an epoxy-based polymer, etc.) or a prepreg (eg, an epoxy-based polymer-containing prepreg, etc.) into a predetermined shape and size, and then FIG. 4(a) and 4(b), the first insertion part 111 into which the prosthesis 120 can be inserted and the first insertion part 111 for inserting the magnetic member 170 into the first plate 110 2 The insertion part 112 is formed. In this case, the first insertion part 111 may be a first insertion hole 111A and/or a first insertion groove 111B. A step 111a for supporting the locking protrusion 121 of the prosthesis 120 may be additionally formed along the inner surface of the

first insertion portions

111 , 111A and 111B. Meanwhile, the second insertion part 112 may be at least one of the second insertion groove and the second insertion hole.

The shape and size processing of the first plate 110, and the shape and size processing of the first insert 111 are not particularly limited as long as the processing method is generally known in the art, for example, CNC processing, punching processing, etc. .

In this case, the shape and size of the first plate 110 are not particularly limited, and may vary depending on the design and design of the protective case. In addition, the shape and size of the first insertion part 111 can be adjusted according to the shape and size of the implant 120 .

(3) (S300A) step: insertion of the implant into the first plate

The implant 120 manufactured in step (S100A) is inserted into the first insertion part 111 of the first plate 110 formed in step (S200A).

At least a portion of the prosthesis 120 is inserted into the first insertion unit 111 , and the locking protrusion 121 of the outer circumferential surface is supported by the inner side of the first insertion unit 111 , specifically, the stepped 111a , so that the implant 120 is inserted into the first insertion unit 111 . Left and right movement of 120 can be prevented. At this time, the upper end of the prosthesis 120 is inserted into the first insertion part 111 so as to extend toward one surface (eg, the upper surface) of the first plate 110 . Since the prosthesis 120 is fixed to the first plate 110 by the first adhesive sheet 140 in a state supported by the first insertion part 111 , it moves from side to side as well as from the first plate 110 . deviation can be prevented.

(4) (S400A) step: formation of a second through hole in the second plate

A first through hole 131 is formed in the second plate 130 .

For example, the second plate 130 is manufactured by processing a plastic plate formed of a polymer such as an epoxy resin into a predetermined shape and size, and then, as shown in FIG. 2 , the first insertion part of the first plate 110 . The first through hole 131 is formed in a shape corresponding to the shape of the implant 120 except for the locking protrusion 121 at the position of the second plate 130 corresponding to the position 111 .

The shape and size processing of the second plate 130, and the shape and size processing of the first through-hole 131 are not particularly limited as long as the processing method is generally known in the art, for example, CNC processing, punching processing, etc. .

In this case, the shape and size of the second plate 130 are not particularly limited, and may vary depending on the shape and size of the first plate 110 . In addition, the shape and size of the first through hole 131 can be adjusted according to the shape and size of the implant 120 .

(5) (S500A) step: formation of a first through hole in the first adhesive sheet

A second through hole 141 is formed in the first adhesive sheet 140 .

For example, the first adhesive sheet 140 is manufactured by processing the hot melt adhesive sheet and/or prepreg to a predetermined shape and size, and then, as shown in FIG. 2 , the first insertion part of the first plate 110 . At the position of the first adhesive sheet 140 corresponding to the position 111 , the second through hole 141 is formed in a shape corresponding to the shape of the implant 120 excluding the locking protrusion 121 .

The shape and size processing of the first adhesive sheet 140 and the shape and size processing of the second through-hole 141 are not particularly limited as long as the processing methods are generally known in the art, for example, CNC processing, punching processing, etc. .

In this case, the shape and size of the first adhesive sheet 140 are not particularly limited, and may vary depending on the shape and size of the first plate 110 . In addition, the shape and size of the second through hole 141 can be adjusted according to the shape and size of the implant 120 .

(6) (S600A) step: lamination of the third plate, the second adhesive sheet, the first plate, the implant, the first adhesive sheet and the second plate

The first adhesive sheet 140 of the step (S500A) and the step (S400A) on one surface of the first plate 110 into which the implant 120 and the magnetic member 170 are respectively inserted in the step (S300A) The second plate 130 is sequentially stacked, and the second adhesive sheet 160 and the third plate 150 are sequentially stacked and laminated on the other surface of the first plate 110 . As a result, the first plate 110 , the prosthesis 120 , and the second plate 130 are integrated through the first adhesive sheet 140 , and the first plate 110 is formed by the second adhesive sheet 160 . ) in which the third plate 150 is integrated with the cover member 100A of the present invention is manufactured. At this time, since the implant 120 is fixed to the first plate 110 by the first adhesive sheet 140 in a state of being seated in the first insertion part 111 in the first plate 110 , not only left and right movements but also the prosthesis 120 is Departure from the cover member can be prevented.

The conditions of the lamination process are not particularly limited, for example, the lamination process may be performed while heat-compressing at a temperature of about 80 to 200 °C. However, the conditions of the lamination process may be adjusted according to the type of the first adhesive sheet 140 . For example, when the first adhesive sheet 140 is a hot melt adhesive sheet, the first plate 110 , the implant 120 , and the first adhesive sheet 140 at a temperature of about 80° C. or higher, specifically, about 100 to 120° C. ) and the second plate 130 may be laminated by heat-compressing the laminate. On the other hand, when the first adhesive sheet 140 is a prepreg, the first plate 110 , the implant 120 , and the first adhesive sheet 140 at a temperature of about 140 ° C. or higher, specifically, about 140 to 170 ° C. And by heat-compressing the laminate of the second plate 130, these may be laminated.

If necessary, before the step (S600A), a fourth through hole 151 may be further formed in the third plate 150 used in the step (S600A). The fourth through hole 151 is formed in a shape corresponding to the shape of the implant 120 excluding the locking protrusion 121 at the position of the third plate 150 corresponding to the position of the first insertion part 111 .

Also, before the step (S600A), a fifth through hole 161 may be further formed in the second adhesive sheet 160 used in the step (S600A). The fifth through hole 161 is formed in a shape corresponding to the shape of the implant 120 excluding the locking protrusion 121 at the position of the second adhesive sheet 160 corresponding to the position of the first insertion part 111 . .

The shape and size processing of the third plate 150 and the second adhesive sheet 160 and the shape and size processing of the fourth and fifth through-

holes

151 and 161 are particularly limited as long as the processing method is generally known in the art. It is not, for example, there are CNC machining, punching machining, etc.

In this case, the shapes and sizes of the third plate 150 and the second adhesive sheet 160 are not particularly limited, and may vary depending on the shape and size of the first plate 110 . In addition, the shape and size of the fourth and fifth through-

holes

151 and 161 may be adjusted according to the shape and size of the implant 120 .

Through the above-described method, the present invention can manufacture a cover member 100A having a three-dimensional shape while having a light weight, high hardness and high strength, as well as excellent bending characteristics, a large size and a thin thickness, unlike the prior art. there is. The cover member 100A of the present invention is applied as at least a portion of the front and/or rear cover of the protective case for mobile devices, and not only gives a three-dimensional shape to the protective case, but also improves the durability of the protective case, , furthermore, it is possible to prevent damage such as breakage or scratching of the portable device.

Hereinafter, FIG. 10 is a flowchart illustrating a process of manufacturing the above-described cover member 100B according to a second embodiment of the present invention, wherein the cover member 100B of the present invention is formed to protrude from the outer circumferential surface of the cover member 100B (S100B). ) forming a prosthesis 120 including; (S200B) forming a first inserting part 111 for inserting the implant 120 and a second inserting part 112 for inserting the magnetic member 170 into the first plate 110; (S300B) inserting the prosthesis 120 into the first inserting part 111 and inserting the magnetic member 170 into the second inserting part 112; (S400B) forming a first through hole 131 in the second plate 130; (S500B) forming a second through hole 141 in the first adhesive sheet 140; and (S600B) sequentially stacking the first adhesive sheet 140 and the second plate 130 on one surface of the first plate 110 , and a second adhesive on the other surface of the first plate 110 . It may be manufactured by a method comprising the step of laminating the sheet 160 and the third plate 150 in sequence. However, it is not limited only by the manufacturing method, and the steps of each process may be modified or selectively mixed as needed. In particular, there is no temporal precedence between steps (S100B) and (S200B), and there is no temporal precedence between steps (S300B), (S400B) and (S500B).

Hereinafter, each process of manufacturing the cover member 100B according to the second embodiment of the present invention will be described with reference to FIG. 10 .

(1) (S100B) step: formation of an implant

The description of step (S100B) of the present invention is omitted because it is the same as described in step (S100A) of the manufacturing process for the cover member 100A according to the first embodiment.

(2) (S200B) step: formation of the first insert and the second insert on the first plate

The first inserting part 111 for inserting the prosthesis 100 and the second inserting part 112 for inserting the magnetic member 130 are formed in the first plate 110 .

A first insertion part 111 for inserting the implant 100 and a second insertion part 112 for inserting the magnetic member 170 are formed in the first plate 110 .

first insertion portions

The shape and size machining of the first plate 110, and the shape and size machining of the first and

second inserts

111 and 112 are not particularly limited as long as the machining method is generally known in the art, for example, CNC machining, Punching processing and the like.

In this case, the shape and size of the first plate 110 are not particularly limited, and may vary depending on the design and design of the protective case. In addition, the shape and size of the first insertion part 111 can be adjusted according to the shape and size of the implant 120 . In addition, the shape and size of the second insertion part 112 may be adjusted according to the shape and size of the magnetic member 170 to be inserted.

(3) (S300B) step: insertion of the implant and magnetic member into the first plate

While inserting the implant 120 manufactured in step (S100B) into the first insertion part 111 of the first plate 110 formed in step (S200B), the magnetic member 130 is inserted into the second insertion part 112 ) is inserted into

In addition, when the magnetic member 170 is inserted, if the magnetic member 170 has no magnetic force, since the magnetic force direction can be adjusted by a magnetizing process later, there is no need to distinguish the insertion direction. However, when the magnetic member 170 has a magnetic force, the insertion direction of one magnetic member is adjusted in consideration of the polarity of the magnetic member so that an attractive force is generated with the other magnetic member in contact with the magnetic member.

(4) (S400B) step and (S500 B) step

Descriptions of steps (S400B) and (S500B) of the present invention are omitted because they are the same as described in steps (S400A) and (S500A) of the manufacturing process for the cover member 100A according to the first embodiment.

(5) (S600B) step: lamination of the third plate, the second adhesive sheet, the first plate, the implant, the magnetic member, the first adhesive sheet, and the second plate

The first adhesive sheet 140 of the step (S500B) and the step (S400B) on one surface of the first plate 110 into which the implant 120 and the magnetic member 170 are respectively inserted in the step (S300B) The second plate 130 is sequentially stacked, and the second adhesive sheet 160 and the third plate 150 are sequentially stacked and laminated on the other surface of the first plate 110 . As a result, the first plate 110 , the prosthesis 120 , the magnetic member 170 and the second plate 130 are integrated via the first adhesive sheet 140 , and the second adhesive sheet 160 provides the The cover member 100A of the present invention in which the third plate 150 is integrated with the first plate 110 is manufactured. At this time, the implant 120 is fixed to the first plate 110 by the first adhesive sheet 140 in a state of being seated in the first insertion part 111 in the first plate 110 , and the magnetic member 170 . is fixed to the first plate 110 by the first adhesive sheet 140 and/or the second adhesive sheet 160 in a state of being seated on the second insertion part 112, so that it moves from side to side as well as from the cover member. departure can be prevented.

If necessary, before the step (S600B), a fourth through hole 151 may be further formed in the third plate 150 used in the step (S600B).

In addition, before the step (S600B), a fifth through hole 161 may be further formed in the second adhesive sheet 160 used in the step (S600B).

Since the process of forming the fourth through hole 151 and the fifth through hole 161 is the same as that described in the step (S600A) of the manufacturing process for the cover member 100A according to the first embodiment, it is omitted. .

Although the embodiment has been described above, it is merely an example and does not limit the present invention, and those of ordinary skill in the art to which the present invention pertains are exemplified above within the range that does not depart from the essential characteristics of the present embodiment. It can be seen that various modifications and applications that have not been made are possible. For example, each component specifically shown in the embodiment can be implemented by modification. And differences related to such modifications and applications should be construed as being included in the scope of the present invention defined in the appended claims.

Claims

a first plate including a first insert;

an implant in which at least a portion is inserted into the first insertion part;

a second plate disposed on an upper surface of the first plate and including a first through hole;

a first adhesive sheet interposed between the first plate and the second plate and including a second through hole;

a third plate disposed on a lower surface of the first plate; and

A second adhesive sheet interposed between the first plate and the third plate

including,

The prosthesis includes a locking protrusion formed to protrude from an outer circumferential surface to be supported inside the first insertion part, and an upper end thereof is extended toward the first through-hole and is disposed, a cover member for a protective case.
According to claim 1,

The lower end of the prosthesis is supported by the first insertion part, a cover member for a protective case.
According to claim 1,

The lower end of the prosthesis is disposed through the first insertion portion, a cover member for a protective case.
4. The method according to any one of claims 1 to 3,

The prosthesis will further include at least one of a third through-hole and a groove portion, a cover member for a protective case.
According to claim 1,

The material of the implant is a metal or polymer, a cover member for a protective case.
According to claim 1,

The implant is an injection molded body, a cover member for a protective case.
According to claim 1,

The first plate has a smaller specific gravity than the second plate, a cover member for a protective case.
The method of claim 1,

The third plate has a larger specific gravity than the first plate, a cover member for a protective case.
4. The method of claim 3,

The third plate includes a fourth through-hole having a shape corresponding to the shape of the prosthesis at a position corresponding to the position of the first insertion part,

The second adhesive sheet may include a fifth through-hole having a shape corresponding to the shape of the prosthesis at a position corresponding to the position of the first insertion part, the protective case cover member.
According to claim 1,

The cover member further comprises a magnetic member,

In this case, the first plate will further include a second insertion portion for inserting the magnetic member, a cover member for a protective case.
(S100) forming a prosthesis including a protruding protrusion formed on the outer circumferential surface;

(S200) forming a first insertion part for inserting the prosthesis into the first plate;

(S300) inserting the prosthesis into the first insertion portion of the first plate;

(S400) forming a first through hole in the second plate;

(S500) forming a second through hole in the first adhesive sheet; and

(S600) sequentially stacking the first adhesive sheet and the second plate on one surface of the first plate, and sequentially stacking the second adhesive sheet and the third plate on the other surface of the first plate.

A method of manufacturing a cover member for a protective case comprising a.
12. The method of claim 11,

In the step (S100), a polymer or metal is injected into an injection mold to form the prosthesis, a method of manufacturing a cover member for a protective case.
13. The method of claim 12,

The method of manufacturing a cover member for a protective case, wherein the prosthesis further comprises at least one of a third through hole and a groove portion.
12. The method of claim 11,

The (S600) step is a method of manufacturing a cover member for a protective case, which will be heat-compressed at a temperature of about 80 to 200 ℃.
12. The method of claim 11,

The step (S200) further forms a second insertion unit for inserting the magnetic member when the first insertion unit is formed,

In this case, the (S300) step is to insert the magnetic member into the second insertion portion when the prosthesis is inserted, a method of manufacturing a cover member for a protective case.