JP5474864B2 - Waterproof cover member, cover main body used therefor, and method for manufacturing waterproof cover member - Google Patents

Description

  The present invention relates to a waterproof cover member, a cover main body used therefor, and a method for manufacturing the waterproof cover member.

  Recently, there is an increasing demand for highly waterproof electronic devices (for example, mobile phones). In order to improve the waterproofness of electronic equipment, it is necessary to improve the sealing performance around the part where the battery, Sim card, memory disk, etc. are put in and out, and the precision parts and optical parts are inserted. Taking the waterproof structure of the battery storage part that stores the battery as an example, when the waterproof member is integrated with the battery cover that covers the opening surface of the battery storage part, the waterproof property between the battery cover and the electronic device body is enhanced. At the same time, a configuration for reducing the thickness of the battery lid is known (see, for example, Patent Document 1). According to such a configuration, the attachment auxiliary portion is integrated on the battery lid side, and a waterproof member made of silicone rubber or the like is attached to the attachment auxiliary portion, while a groove shape is formed around the opening of the battery storage portion on the housing side of the electronic device. Is formed, and waterproofing is realized by press-fitting a waterproof member on the battery lid side into the fitting portion.

Japanese Patent No. 4424445

  However, the above known battery lid has the following problems. That is a problem that minute unevenness or distortion occurs on the outer surface of the battery lid. Hereinafter, description will be given with reference to the drawings.

  FIG. 7 is a perspective view seen from both the inside and the outside of a conventionally known battery lid. 8 is a cross-sectional view taken along line XX of the battery lid as viewed from the inside shown in FIG. 7 and an enlarged cross-sectional view of a part (region Y) thereof. FIG. 9 is a diagram illustrating a manufacturing state of the battery lid illustrated in FIG. 8, and is an enlarged cross-sectional view illustrating an enlarged peripheral portion of the elastic sealing material.

  The conventionally known battery lid 100 has a rectangular closed loop projection 102 that projects toward the opening side of the battery lid 100 on the inner surface of the bottom plate 101, and an elastic coating that covers the top surface to the side surface of the projection 102. And a sealing material 103. The outer side of the bottom plate 101 is preferably subjected to a treatment for improving the aesthetic appearance by painting or the like. As shown in FIG. 7, on the outer surface of the bottom plate 101, a deformation region 104 such as minute unevenness or distortion may occur in the vicinity of the back side of the protruding portion 102. As a result of pursuing this cause, the present inventors have found that the cause is latent in the manufacturing process in which the elastic sealing material 103 is integrated with the protrusion 102.

  As shown in FIG. 9, when the elastic sealing material 103 is integrated with the protrusion 102 of the battery lid 100, the lower mold 111, the first upper mold 112, the second upper mold 113, and the third upper mold 114. The molded battery lid 100 is inserted into a molding compound mold made of the above, and in the space formed by the first upper mold 112, the second upper mold 113, the third upper mold 114, and the protrusion 102 Then, a liquid elastic sealing material composition for forming the elastic sealing material 103 is filled and cured. The elastic sealing material composition is supplied from the gate 115 into the space. The first upper mold 112 is clamped in a state where the lower end surface 122 is pressed against the vicinity of the outer side of the protruding portion 102 on the inner surface of the bottom plate 101. Similarly, the second upper mold 113 is clamped in the state where the lower end surface 123 is pressed against the inside of the protruding portion 102. When the composite mold is clamped, a load is applied to the bottom plate 101 from the lower end surfaces 122 and 123 in the direction indicated by the arrow. In the process of integrating the elastic sealing material 103 with the protruding portion 102, not only the above-mentioned load but also heat is applied to the bottom plate 101, so that the portions Z and Z immediately below the lower end surfaces 122 and 123 of the bottom plate 101 are deformed. It becomes easy to do.

  In order to prevent deformation at the locations Z and Z of the bottom plate 101, the load at the time of mold clamping is lowered, and the bottom plate from the lower end surface 122 of the first upper mold 112 and the lower end surface 123 of the second upper mold 113 is used. A method of reducing the load applied to 101 is also conceivable. However, when the load is lowered, the elastic sealing material composition flows out from the gap between the lower end surfaces 122 and 123 and the inner surface of the bottom plate 101, generating burrs in the elastic sealing material 103, generating bubbles in the elastic sealing material 103, or The occurrence of sink marks in the bottom plate 101 is likely to occur.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide a waterproof cover member having an excellent appearance and having an elastic sealing material molded with high accuracy.

  In order to achieve the above object, an embodiment of the present invention is a waterproof cover member that can be attached to an electronic device so that it can cover and expose an opening that leads to the inside of the electronic device or a waterproof component that is attached to the electronic device. A cover plate that covers an opening or a part of an electronic device, a closed loop-shaped protrusion that protrudes from the inner surface of the cover plate toward the opening, and a closed-loop groove formed around the opening or the part An elastic sealing material that is softer than the protruding portion and covers at least the outer side surface from the tip of the protruding portion, and a closed loop-shaped rib that is lower than the protruding portion on the inside and outside of the protruding portion. It is a waterproof cover member provided.

  Another embodiment of the present invention is a waterproof cover member that further includes a decorative layer on the outer surface of the cover plate.

  One embodiment of the present invention is a cover body for a waterproof cover member that can be attached to and exposed to an opening that leads to the inside of an electronic device or a component that requires waterproofing attached to the electronic device and can be exposed to the electronic device. A covering plate that covers an opening or a part of an electronic device, a closed loop-shaped protruding portion that protrudes from the inner surface of the covering plate toward the opening side, and at least outside of the inside and outside of the protruding portion, is lower than the protruding portion It is a cover main body provided with a closed loop-shaped rib.

  An embodiment of the present invention is a method of manufacturing a waterproof cover member that can be attached to an electronic device so that the opening that leads to the inside of the electronic device or a waterproof part that is attached to the electronic device can be covered and exposed to the electronic device. A cover plate that covers the opening or part of the device, a closed loop-shaped protrusion that protrudes from the inner surface of the cover plate toward the opening, and a closed loop that is lower than the protrusion at least on the inside and outside of the protrusion An insert step of inserting a cover body having a rib-shaped rib into a composite mold for molding, and another mold that forms a composite mold by arranging a lower mold constituting the composite mold on the outer surface side of the cover plate The mold is clamped between the lower mold and the upper mold so that the lower end surface of one or more upper molds facing the lower mold with the cover plate interposed therebetween is in contact with the rib. Clamping process and compound mold Can be pressurized and heated to supply the elastic sealant composition into the space formed at least from the upper mold and the protrusion, and can be inserted into the closed loop groove formed around the opening or parts And a forming step of forming an elastic sealing material softer than the protrusion that covers at least the outer side surface from the tip of the protrusion.

  Another embodiment of the present invention is a method for manufacturing a waterproof cover member in which a rib formed on the cover body has an apex with an acute angle.

  Another embodiment of the present invention is a method for manufacturing a waterproof cover member, further comprising a coat layer on the surface of the lower mold that is in contact with the outer surface of the cover plate.

  ADVANTAGE OF THE INVENTION According to this invention, a waterproof cover member provided with the elastic sealing material which has a favorable external appearance and was shape | molded with high precision can be provided.

FIG. 1 is a diagram showing a battery cover, which is an example of a waterproof cover member according to the first embodiment, removed from a casing of an electronic device, and a rear side of the casing and an inner side of the battery cover facing the front, It is an enlarged view of a part (area B) inside the battery lid. FIG. 2 is a perspective view of the inside of the battery lid shown in FIG. FIG. 3 is a cross-sectional view of the battery lid shown in FIG. 1 taken along line AA and an enlarged cross-sectional view of a part (region C) thereof. FIG. 4 is a cross-sectional view in the vicinity of the protruding portion and an enlarged cross-sectional view in the vicinity of the rib D after forming, showing a state in which the cover body of the battery lid is inserted into the mold and the elastic seal material is integrally formed with the protruding portion. FIG. 5 is a cross-sectional view of the vicinity of the protruding portion showing a state in which the cover body of the battery lid is inserted into the mold and the elastic sealing material is integrally formed with the protruding portion, and illustrates a modification of the method shown in FIG. It is sectional drawing for doing. FIG. 6 is a diagram showing a back cover, which is an example of a waterproof cover member according to the second embodiment, removed from the back surface of the electronic device, with the back side of the electronic device and the inside of the back cover facing each front. It is. FIG. 7 is a perspective view seen from both the inside and the outside of a conventionally known battery lid. 8 is a cross-sectional view taken along line XX of the battery lid as viewed from the inside shown in FIG. 7 and an enlarged cross-sectional view of a part (region Y) thereof. FIG. 9 is a diagram illustrating a manufacturing state of the battery lid illustrated in FIG. 8, and is an enlarged cross-sectional view illustrating an enlarged peripheral portion of the elastic sealing material.

  Next, a waterproof cover member of the present invention, a cover body used therefor, and a method for manufacturing the waterproof cover member will be described with reference to the drawings. In each of the following embodiments, a battery cover and a back cover will be described as an example of a waterproof cover member. However, the waterproof cover member may have other forms as long as the waterproof portion of the cover is realized. Applicable.

<First embodiment>
1. Configuration of Waterproof Cover Member FIG. 1 shows a battery cover, which is an example of a waterproof cover member according to the first embodiment, removed from the housing of an electronic device, and the back side of the housing and the inside of the battery cover are respectively front-facing. FIG. 2 is an enlarged view of a part (region B) inside the battery cover and a view shown in FIG. FIG. 2 is a perspective view of the inside of the battery lid shown in FIG. FIG. 3 is a cross-sectional view of the battery lid shown in FIG.

  The electronic device 1 includes a housing 2 constituting the main body, and a battery lid 3 as a waterproof cover member that covers the opening 21 that opens to the back side of the housing 2 and communicates with the inside of the electronic device 1. The opening 21 of the housing 2 is a battery storage unit that stores the battery 22. The housing 2 includes a rectangular closed-loop groove 23 on the outer periphery of the opening 21. The housing 2 includes a substantially U-shaped end surface 24 at a portion facing the lower edge and side edge of the battery lid 3. Furthermore, the housing 2 includes two concave portions 25 and 25 at the joint portion with the upper end of the battery lid 3, and one concave portion 26 at the joint portion with the lower portion of the battery lid 3.

  The battery lid 3 is a member that can be attached to the electronic apparatus 1 so that the opening 21 can be covered and exposed. The battery lid 3 can be inserted into a covering plate 30 covering the opening 21, a rectangular closed-loop protruding portion 32 protruding from the inner surface of the covering plate 30 toward the opening side, and a groove 23 on the housing 2 side. An elastic sealing material 33 that covers the side surface from the tip of the protruding portion 32 and is softer than the protruding portion 32; rectangular closed-loop-like ribs 37 and 38 that are formed on the outer side and the inner side of the protruding portion 32 and are lower than the protruding portion 32; Is provided.

  Except for the elastic sealing material 33, the battery cover 3 is preferably made of a resin, more preferably a thermoplastic resin, a thermosetting resin, an ultraviolet curable resin, or an electron beam curable resin. Consists of a polycarbonate resin, a polyester resin, an acrylic resin, an ABS resin or a polyamide resin, and among them, a polycarbonate resin having particularly excellent heat resistance can be preferably used. The cover plate 30 has a side wall that is open only in its upper part and is connected in other directions. The opening end surface 34 which is the end surface of the side wall is substantially U-shaped, and comes into contact with the end surface 24 on the housing 2 side when the battery lid 3 is attached to the housing 2. The protruding portion 32 is a rectangular closed loop-shaped convex portion formed lower than the depth of the groove portion 23.

  The protrusion 32 is provided with a rectangular closed loop elastic seal material 33 made of an elastomer, preferably at the tip thereof. Examples of suitable materials for the elastic sealing material 33 include silicone rubber, urethane rubber, ethylene propylene diene rubber (EPDM), fluorine rubber, nitrile rubber (NBR), natural rubber, and the like. Silicone rubber which is excellent in properties and has a small compression set can be suitably used.

  The battery lid 3 includes two inverted L-shaped projections 35, 35 spaced apart from each other at a predetermined interval on the upper end thereof, and includes one inverted L-shaped projection 36 on the lower part of the battery lid 3. When the battery cover 3 is attached to the rear surface of the housing 2, the convex portion 36 is inserted from the opening portion of the concave portion 26, and the convex portions 35 and 35 are inserted toward the concave portions 25 and 25. The convex portions 35, 35, 36 and the concave portions 25, 25, 26 are formed in shapes and positions that allow such attachment. However, the attachment method of the battery lid 3 and the housing 2 is not limited to the above method.

  The ribs 37 and 38 are rectangular closed loop-shaped convex portions formed on the outer periphery and the inner periphery of the protrusion 32, respectively. As will be described later, the ribs 37 and 38 are higher than those after the integral molding before the elastic sealing material 33 is integrally molded with the protruding portion 32, but the ribs 37 and 38 are lowered by the pressurization and heating during the integral molding. It is the remaining. The suitable width (widest width of the bottom) of the ribs 37 and 38 is in the range of 0.01 to 0.2 mm (10 to 200 μm), more preferably in the range of 0.02 to 0.15 mm (20 to 150 μm). It is. Moreover, the suitable height of the ribs 37 and 38 is the range of 0.01-0.18 mm (10-180 micrometers), More preferably, it is the range of 0.02-0.13 mm (20-130 micrometers). The height of the ribs 37 and 38 before the integration between the protruding portion 32 and the elastic sealing material 33 is in the range of 0.02 to 0.20 mm (20 to 200 μm), more preferably 0.03 to 0.15 mm. (30 to 150 μm), and the angle between the bottom surface of the ribs 37 and 38 before integration and the apex (when there is no apex, the virtual apex where the side surfaces of the ribs 37 and 38 are combined), that is, The apex angle is preferably in the range of 30 to 70 degrees, and more preferably in the range of 30 to 60 degrees.

  The ribs 37 and 38 have a function of preventing a liquid elastic sealing material composition (preferably an elastomer composition) for constituting the elastic sealing material 33 from flowing out around the protruding portion 32 during integral molding. Have. In addition, the ribs 37 and 38 prevent the gap between the elastic sealing material 33 and the cover plate 30 from being exposed, and have a role of locking the ribs 37 and 38 on the inner sides. For this reason, even if the battery cover 3 is repeatedly attached to and detached from the housing 2, there is almost no risk that the user's claws or the like will enter the gap between the elastic sealing material 33 and the cover plate 30, and the elastic sealing material 33 is removed from the protrusion 32. It is possible to effectively prevent peeling. The ribs 37 and 38 are preferably formed on the outer side and the inner side of the protruding portion 32, respectively, but only one of the ribs 37 and 38 may be formed. When only one of the ribs 37 and 38 is formed, it is particularly preferable to form only the rib 37 formed on the outer periphery of the protruding portion 32. This is due to the following reason. Since it is necessary to seal the gap between the elastic seal material 33 covering the tip portion of the protrusion 32 and the groove 23 to ensure waterproofness, the elastic seal material 33 is provided at least outside the protrusion 32 into which water enters. Form. Therefore, when the elastic sealing material 33 is formed outside the protruding portion 32, it is necessary to form the rib 37 on the same outside.

  The covering plate 30 preferably includes a decoration layer 39 on the outer surface thereof. The decorative layer 39 may be formed using any pigment-based or dye-based paint, and more preferably formed by painting or printing from a pigment-based paint having high weather resistance.

2. FIG. 4 is a cross-sectional view of the vicinity of the protruding portion showing a state in which the cover body of the battery lid is inserted into the mold and the elastic seal material is integrally formed with the protruding portion, and the vicinity of the rib D after forming FIG.

  The battery lid 3 includes an elastic sealing material 33 and a cover body 40 excluding the elastic sealing material 33. The cover main body 40 includes at least the covering plate 30, the projecting portion 32, and the ribs 37 and 38. In this embodiment, the cover main body 40 also includes the convex portions 35 and 36. When the elastic sealing material 33 is formed on the projecting portion 32 of the cover body 40, first, the lower mold 41, the first upper mold 42 that constitutes the upper mold, and the second upper mold that also constitutes the upper mold. The cover main body 40 is inserted into a molding compound mold composed of 43 and a third upper mold 44 that also constitutes the upper mold (insert step). The lower mold 41 is disposed so as to contact the cover plate 30 of the cover body 40. The upper mold is a mold that faces the lower mold 41 with the cover plate 30 interposed therebetween. The first upper mold 42 is disposed in a region outside the protrusion 32 from a central axis that penetrates the top of the protrusion 32 downward. The second upper mold 43 is disposed at a height from the central axis of the projecting portion 32 to the inner region of the projecting portion 32 and to the lower region of the elastic sealing material 33. The third upper mold 44 is disposed on the first upper mold 42 and is disposed above the elastic sealing material 33.

  The first upper mold 42 and the second upper mold 43 include a lower end surface 52 and a lower end surface 53 that are in contact with the tops of the ribs 37 and 38 at their lower ends. The lower mold 41 is disposed on the outer surface side of the cover main body 40, and the lower molds are brought into contact with the lower end surfaces 52 and 53 of the first upper mold 42 and the second upper mold 43 on the ribs 37 and 38, respectively. 41, the first upper mold 42, the second upper mold 43, and the third upper mold 44 are clamped (clamping step). Next, the inside of the composite mold is pressurized and heated with a load capable of leaving the ribs 37 and 38, and the first upper mold 42, the second upper mold 43, and the third upper mold 44 are mainly used. Then, the elastic sealing material composition is supplied into the space V formed from the projecting portions 32 to form the elastic sealing material 33 (molding step). The supply port of the composition is a gate 45 formed between the second upper mold 43 and the third upper mold 44 so as to communicate with the space V.

  Here, the load applied to the lower mold 41 from the first upper mold 42 and the second upper mold 43 is set lower than before so that deformation such as irregularities does not occur on the outer surface of the cover plate 30. ing. As a specific example, a suitable molding load is 301 to 661 kN, which is reduced by about 10% from the conventional 335 to 735 kN. When the molding load is lowered, the elastic sealing material composition easily spreads around the protruding portion 32 but is blocked by the ribs 37 and 38. During the molding process, the lower end surfaces 52 and 53 of the first upper mold 42 and the second upper mold 43 slightly move in the direction of the lower mold 41 while crushing the ribs 37 and 38 from their tops. As a result, as shown in the enlarged cross-sectional view near the rib 38, the rib 38 (and the rib 37) is lowered from the position of the alternate long and short dash line to the position of the solid line. Eventually, the ribs 37 and 38 do not completely disappear and are positioned slightly higher than the inner surface of the cover plate 30. As described above, since the ribs 37 and 38 are not completely lost even during the molding process, the effect of the elastic sealing material composition is maintained during the molding process.

  Since the top portions of the ribs 37 and 38 are acute and narrow, when a load is applied from the first upper mold 42 and the second upper mold 43 to the lower mold 41, the lower end surfaces 52 and 53 are formed on the rib 37. , 38 can be easily crushed. As a result, the gaps between the top surfaces of the ribs 37 and 38 and the lower end surfaces 52 and 53 of the first upper mold 42 and the second upper mold 43 can be made zero or extremely thin. Therefore, the risk that the elastic sealing material composition flows out of the ribs 37 and 38 beyond the lower end surfaces 52 and 53 is extremely low. The top portions of the ribs 37 and 38 are set as horizontal surfaces so as to be in contact with the lower end surfaces 52 and 53 of the first upper mold 42 and the second upper mold 43 without any gaps, thereby preventing the elastic sealing material composition from flowing out. Is theoretically possible. However, it is extremely difficult to make the top surfaces of the ribs 37 and 38 horizontal and smooth so as to contact the lower end surfaces 52 and 53 accurately. Therefore, in this embodiment, the top portions of the ribs 37 and 38 are easily crushed so that the elastic sealing material composition does not flow out of the ribs 37 and 38 beyond the lower end surfaces 52 and 53. ing.

  The decoration process for forming the decorative layer 39 shown in FIG. 3 on the outer surface of the cover plate 30 can be performed before the insert process or after the molding process. In order to reliably prevent the decorative layer 39 from being damaged or distorted by the molding process, it is preferable to perform the decoration process after the molding process.

  Although the first upper mold 42 and the third upper mold 44 are divided so as to be easily separated from the molded body after the elastic sealing material 33 is molded, they may be integrated. In addition, when the vicinity of the top of the elastic seal material 33 has a shape that also bulges inside the protrusion 32, the second upper mold 43 is divided in the same manner as the first upper mold 42 and the third upper mold 44. You may do it.

  FIG. 5 is a cross-sectional view of the vicinity of the protruding portion showing a state in which the cover body of the battery lid is inserted into the mold and the elastic sealing material is integrally formed with the protruding portion, and illustrates a modification of the method shown in FIG. It is sectional drawing for doing.

  As shown in FIG. 5, the lower mold 41 includes a coat layer 60 on the surface in contact with the outer surface of the cover plate 30. The coat layer 60 is a layer having a hardness equal to or less than that of the outer surface of the cover plate 30. The hardness is measured by a method suitable for the material of the object to be measured. Both the cover plate 30 and the coat layer 60 are formed of a resin, or the cover plate 30 is formed of a resin while the coat layer 60 is formed. For example, hardness means Shore hardness. The coat layer 60 is preferably a layer made of a resin, and preferably made of a silicone resin or a fluorine resin. By forming the coat layer 60 on the inner surface of the lower mold 41, the shape of the lower mold 41 and the dimensional error of the battery lid 3 can be absorbed by the coat layer 60. As a result, the outer surface of the battery lid 3 is further less likely to be deformed such as unevenness.

<Second Embodiment>
FIG. 6 is a diagram showing a back cover, which is an example of a waterproof cover member according to the second embodiment, removed from the back surface of the electronic device, with the back side of the electronic device and the inside of the back cover facing each front. It is.

  The electronic device 70 includes a back cover 80 that is an example of a waterproof cover member that covers the opening 71 that opens to the back side thereof. The opening 71 is a battery storage unit that stores the battery 72. The electronic device 70 includes a rectangular closed-loop groove 73 outside the opening 71 on the back surface thereof. In the area surrounded by the groove 73, in addition to the opening 71, there is an opening 74 for loading a disk or a card. Furthermore, the electronic device 70 includes a camera 75 in a region on the back side and outside the groove 73. The camera 75 is an example of a part that requires waterproofing and is attached to the electronic device 70. A rectangular closed loop groove 73 ′ is provided on the outer periphery of the camera 75. That is, the electronic device 70 includes two groove portions 73 and 73 'independently on the back surface thereof.

  The back cover 80 is a waterproof cover member attached to the electronic device 70 so as to cover the entire back surface of the electronic device 70. The back cover 80 includes a tray-shaped cover plate 81 in which a bottom plate facing the back surface of the electronic device 70 and a side wall facing the side surface of the electronic device 70 are connected. The back cover 80 can be inserted into a rectangular closed-loop-shaped protruding portion 82 that protrudes from the inner surface of the bottom plate of the covering plate 81 toward the opening side of the covering plate 81, and the groove portion 73. An elastic sealing material 83 that covers and is softer than the protruding portion 82 and rectangular closed loop ribs 87 and 88 that are formed outside and inside the protruding portion 82 and are lower than the protruding portion 82 are provided. Further, the back cover 80 has a rectangular closed-loop protruding portion 82 ′ protruding from the inner surface of the bottom plate of the covering plate 81 toward the opening side of the covering plate 81 at a position facing the groove portion 73 ′ of the electronic device 70, An elastic sealing material 83 ′ that can be inserted into the groove 73 ′, covers the side surface from the tip of the protrusion 82 ′, and is softer than the protrusion 82 ′, and is formed outside and inside the protrusion 82 ′. Low rectangular closed loop ribs 87 ′, 88 ′. A transparent plate 85 is fitted in the area inside the rib 88 ′ so that the camera 75 can take a picture.

  The protruding portion 82, the elastic sealing material 83, and the ribs 87, 88 have the same configuration and manufacturing method as the protruding portion 32, the elastic sealing material 33, and the ribs 37, 38 of the battery lid 3 described in the first embodiment. It is formed. Similarly, the protrusion 82 ′, the elastic seal material 83 ′, and the ribs 87 ′ and 88 ′ are also the protrusion 32, the elastic seal material 33, the rib 37, and the protrusion of the battery lid 3 described in the first embodiment. It is formed by the same structure and manufacturing method as 38. Therefore, in this embodiment, the redundant description of the protrusions 82 and 82 ′, the elastic seal materials 83 and 83 ′, and the ribs 87, 87 ′, 88, and 88 ′ is omitted, and the first embodiment is used. Substitute the contents described.

<Other embodiments>
The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention. .

  For example, the waterproof cover member may cover an opening other than the openings 21, 71 and 74 or an attachment port, for example, an attachment port such as a memory card. The decoration layer 39 is not necessarily required. The apex of the ribs 37, 38, 87, 87 ', 88, 88' is preferably an acute angle, but the acute angle is not essential and may be an obtuse angle. Furthermore, the top portion may have a curved shape or a planar shape.

  The outer shape of the protrusions 32, 82, and 82 'does not have to be a rectangle, and may be an ellipse or a perfect circle, or a triangle or a pentagon or more. The same applies to the ribs 37, 38, 87, 87 ', 88, 88'. However, since the ribs 37, 38, 87, 87 ′, 88, 88 ′ are preferably disposed close to the outer periphery and inner periphery of the protrusions 32, 82, 82 ′, the protrusions 32, 82, 82 are provided. It is preferably formed in a closed loop shape having the same shape as'. The elastic sealing materials 33, 83, 83 'may be formed only outside the protrusions 32, 82, 82', respectively. The waterproof cover member is not limited to a member that is completely separated from the electronic device 2 and the electronic device 70, such as the battery cover 3 or the back cover 80, and is always open and closed that is connected to the electronic devices 2 and 70. A possible lid may be used.

  In the first embodiment and the second embodiment described above, one or more features may be combined. For example, the battery cover 3 as an example of the waterproof cover member according to the first embodiment is similar to the back cover 80 as an example of the waterproof cover member according to the second embodiment. It is good also as a shape which covers the whole. On the other hand, the back cover 80 may have a shape that covers a part of the back surface of the electronic device 1, similarly to the battery lid 3.

  INDUSTRIAL APPLICABILITY The present invention can be applied to a wide range of electronic devices other than mobile phone devices and other communication devices. For example, if waterproofing is required, a slave unit and home audio device capable of wireless communication with the main body of a fixed phone device It can also be applied to remote controllers used in electric vehicles, electric vehicles equipped with batteries, and the like.

  The present invention can be used for waterproof electronic devices.

1 Electronic device 3 Battery cover (an example of a waterproof cover member)
21 Opening 23 Groove 30 Cover plate 32 Projection 33 Elastic seal material 37, 38 Rib 39 Decoration layer 40 Cover body 41 Lower mold (part constituting the composite mold)
42 First upper mold (a part of the upper mold constituting the composite mold)
43 Second upper mold (a part of the upper mold constituting the composite mold)
52, 53 Lower end surface 60 Coat layer 70 Electronic device 71, 74 Opening 73, 73 ′ Groove 75 Camera (an example of a part)
80 Back cover (an example of a waterproof cover member)
81 Cover plate 82, 82 'Protruding part 83, 83' Elastic seal material 87, 87 'Rib 88, 88' Rib V space

Claims (6)

A waterproof cover member that can be attached to and exposed to an opening that leads to the inside of the electronic device or a waterproof component that is attached to the electronic device,
A cover plate covering the opening or the component of the electronic device;
A closed loop-shaped projecting portion projecting from the inner surface of the covering plate toward the opening side;
An elastic sealing material softer than the protrusion, which can be inserted into a closed loop groove formed around the opening or the part and covers at least the outer side surface from the tip of the protrusion;
A waterproof cover member comprising a closed loop-shaped rib lower than the protruding portion on at least the outer side of the protruding portion inside and outside.   The waterproof cover member according to claim 1, further comprising a decorative layer on an outer surface of the covering plate. A cover main body for a waterproof cover member that can be attached to and exposed to an opening that leads to the inside of the electronic device or a waterproof component that is attached to the electronic device,
A cover plate covering the opening or the component of the electronic device;
A closed loop-shaped projecting portion projecting from the inner surface of the covering plate toward the opening side;
A cover main body comprising a closed loop-shaped rib lower than the protruding portion on at least the outer side of the protruding portion inside and outside. A method of manufacturing a waterproof cover member that can be attached to and exposed to an opening that leads to the inside of an electronic device or a waterproof component that is attached to the electronic device,
A covering plate that covers the opening or the component of the electronic device, a closed loop-shaped protruding portion that protrudes from the inner surface of the covering plate toward the opening side, and at least the outer side inside and outside the protruding portion And an insert step of inserting a cover body having a closed loop-shaped rib lower than the protruding portion into a molding compound mold,
A lower mold that constitutes the composite mold is disposed on the outer surface side of the cover plate, and is another mold that constitutes the composite mold that faces the lower mold across the cover plate. A mold clamping step of clamping between the lower mold and the upper mold, with the lower end surfaces of the two or more upper molds being in contact with the ribs;
The inside of the composite mold is pressurized and heated, and an elastic sealing material composition is supplied into the space formed at least from the upper mold and the protrusion, and is formed around the opening or the part. A molding step of molding an elastic sealing material softer than the projection, which can be inserted into the closed loop groove portion and covers at least the outer side surface from the tip of the projection;
The manufacturing method of the waterproof cover member characterized by including.   The said rib formed in the said cover main body has an acute-angled top part, The manufacturing method of the waterproof cover member of Claim 4 characterized by the above-mentioned.   The method for manufacturing a waterproof cover member according to claim 4 or 5, wherein the lower mold includes a coat layer on a surface in contact with an outer surface of the cover plate.

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