JP5531547B2 - Waterproof structure for electronic equipment and manufacturing method thereof - Google Patents

Description

  The present invention relates to a waterproof structure for an electronic device and a method for manufacturing the waterproof structure for an electronic device, and more particularly to a waterproof structure for a portable electronic device such as a mobile phone and a smartphone and a method for manufacturing the waterproof structure for an electronic device.

  In recent years, the use of portable electronic devices has been diversified and can be used without sacrificing portability while having various functions such as calling, sending and receiving e-mails, Internet connection, games, and TV viewing. Therefore, there is a demand for small size and thinness.

  On the other hand, the use environment of portable electronic devices has been diversified, and for example, it has strong waterproof performance so that it can be used without malfunction in rainy environments, kitchens, and wet environments such as baths and poolsides. It has been demanded.

  As a general method of imparting waterproof performance to a portable electronic device, a gasket holding groove is provided around the outer periphery of one of the two cases forming the casing of the portable electronic device, There is a method in which a gasket made of a rubber-like elastic material is in close contact with the bottom surface of the gasket holding groove and the other case, and the gap between the casings is filled by a repulsive force generated by pressing and compressing the gasket. The following technologies have been proposed for the waterproof structure.

  In Japanese Patent Application Laid-Open No. 2008-249139, “Waterproof structure of electronic device”, the gasket is convex toward the case on the close contact surface with the case, and when the gasket is inserted into the gasket holding groove. A structure has been proposed in which the pressure load on the gasket is reduced by the presence of voids that serve as escape routes for the resin during compression.

  Further, in Japanese Patent Application Laid-Open No. 2008-182093 “Waterproof Mechanism” of Patent Document 2, a tight fitting groove is formed in the upper part of the gasket, and a recess is formed in the bottom part of the groove formed in the case of the other side, and the other case is configured. A structure has been proposed in which the pressing load of the gasket is reduced by tightly fitting the tightly fitting groove at the protruding portion.

  On the other hand, when the groove dimension is very small, a method of directly supplying a material imparting a waterproof function into the groove has been proposed. For example, Japanese Patent No. 3270691 of "Patent Document 3" Front lens in an automotive lamp “Seal structure between the leg and seal groove”, a concave part is formed on one outer periphery of two cases, a convex part is formed on the other outer peripheral part, and a liquid foam resin is applied and cured on the concave part of one case Then, a method of filling the gap between the cases by inserting the convex part of the other case into the concave part has been proposed.

  In Patent Document 3, prior to the supply of the liquid foam resin serving as a gasket to the recess, a skin layer of the same type of component as the supply resin is formed on the inner peripheral surface of the recess in advance, thereby sealing the engagement portion. Structures that enhance the performance have been proposed.

JP 2008-249139 A (page 3-4) JP 2008-182093 A (Page 5-6) Japanese Patent No. 3270691 (page 3-4)

  Here, when considering providing waterproof performance to portable electronic devices that are required to be small and thin, due to dimensional constraints, the gasket holding groove dimensions are, for example, a width of 1 mm or less and a depth of 1 mm or less. The dimensions are as follows.

  However, in the techniques described in Patent Document 1 and Patent Document 2, the shape of the gasket is molded with high accuracy in accordance with the small gasket holding groove dimensions as described above, and the gasket is accurately transferred to the gasket holding groove portion. Good <It is difficult to realize the process of inserting. For this reason, even if the convex part of the other case is inserted into the concave part of the outer peripheral part of the two cases, the engaged case cannot obtain a sufficient water penetration preventing effect.

  Further, with the technique described in Patent Document 3, it is difficult for the liquid foamed resin to be applied / cured to realize dense holes that can correspond to the gasket holding groove dimensions. Further, when a non-foamed resin is used instead of the foamed resin, the resin is filled in such a way that there is no void in the recess, so that there is almost no space for the resin to escape when the non-foamed resin is compressed. Therefore, a large pressing load is required for fitting the case, and the fitting portion of the outer peripheral portion of the case is deformed by the pressing load. As a result, the engaged case cannot obtain a sufficient water entry preventing effect.

(Object of the present invention)
An object of the present invention has been made to solve the above-described problems, and does not hinder downsizing and thinning, and has a waterproof structure for an electronic device having a sufficient water entry preventing effect, and an electronic device The object is to provide a waterproof structure manufacturing method.

  In order to solve the above-described problems, the waterproof structure for an electronic device according to the present invention employs the following characteristic configuration.

  (1) A waterproof structure for an electronic device that prevents liquid from entering the housing of the electronic device, wherein the housing includes a first case member and a second case member that are divided into two parts. The case member and the second case member have a structure in which the outer peripheral portions engage with each other, and the protrusion formed on the outer peripheral portion of the first case member engages the outer peripheral portion with each other. A groove formed on the outer periphery of the second case member for inserting a protrusion, at least one or more recesses formed on the bottom surface of the groove, and a liquid repellent applied to the surface of the groove including the recesses A waterproof structure for an electronic device comprising at least a film and a liquid resin disposed on the liquid repellent film applied to the surface of the groove, wherein the liquid repellent film is a film having a liquid repellent effect on the liquid resin .

  According to the waterproof structure of an electronic device and the waterproof structure manufacturing method of the electronic device of the present invention, the following effects can be achieved.

  Of the two case members, by inserting the protrusion on the outer peripheral portion of one case member into the groove on the outer peripheral portion of the other case member, the housing structure of the electronic device that engages the two case members is used as the other case member. At least one or more recesses are formed on the bottom surface of the groove of the case member, and a liquid resin is disposed on the liquid-repellent film applied to the surface of the groove including the recesses with a void in the recess. Therefore, after the liquid resin is cured, the protrusion of one case member is inserted into the groove of the other case member to press the liquid resin without applying a large pressing load. The liquid resin is deformed so as to fill the gap in the recess, and the cases can be engaged with each other in a state of being in close contact with the liquid resin.

  Thus, sufficient waterproof performance can be achieved without hindering the downsizing and thinning of electronic devices. In particular, sufficient waterproof performance can be imparted without hindering the reduction in size and thickness of portable electronic devices such as mobile phones, smartphones, and UMPCs (Ultra Mobile Personal Computers).

It is an external view of two case members which constitute a case of an electronic device according to the present invention. It is sectional drawing which shows an example in the state where two case members of the 1st case member of FIG. 1 and a 2nd case member are not mutually engaged. It is sectional drawing which shows an example of the state which two case members of the 1st case member of FIG. 1 and a 2nd case member are mutually engaged. It is sectional drawing which shows the example different from FIG. 2 of the state which the two case members of the 1st case member of FIG. 1, and the 2nd case member are not mutually engaged.

  Hereinafter, preferred embodiments of a waterproof structure for an electronic device and a method for manufacturing the waterproof structure for an electronic device according to the present invention will be described with reference to the accompanying drawings. In the following description, an example of a waterproof structure for an electronic device according to the present invention and an example of a manufacturing method thereof will be described. In particular, the waterproof structure for a small electronic device expected to be small and thin is preferably applied. For example, it can be more suitably applied as a waterproof structure for portable electronic devices such as mobile phones, smartphones, and UMPCs (Ultra Mobile Personal Computers).

(Features of the present invention)
Prior to the description of the embodiments of the present invention, an outline of the features of the present invention will be described first. In the waterproof structure for an electronic device according to the present invention, the casing of the electronic device is divided into two case members, a first case member and a second case member, and the first and second case members engage with each other. At the outer periphery, a protrusion formed on the outer periphery of the first case member, a groove formed on the outer periphery of the second case member for inserting the protrusion, and at least one formed on the bottom surface of the groove It has at least two recesses and a liquid resin disposed in the groove, and a liquid repellent film having a liquid repellent effect on the liquid resin is formed on the surface of the groove including the recess. Yes.

  In the method for manufacturing a waterproof structure for a portable electronic device according to the present invention, the first case member and the second case member are engaged with each other in the outer peripheral portion to manufacture the casing of the electronic device. A protrusion forming step for forming a protrusion on the outer periphery of the case member; a groove forming step for forming a groove for inserting the protrusion on the outer periphery of the second case member; and at least one or more on the bottom surface of the groove A recess forming step for forming a recess, a liquid repellent film forming step for forming a liquid repellent film having a liquid repellent effect on the liquid resin on the surface of the groove including the recess, and the liquid repellent film formed in the groove. And a liquid resin disposing step of applying and curing the liquid resin on the substrate.

  Thus, when the outer peripheral portions of the two case members of the first case member and the second case member are engaged with each other, the outer peripheral portions of the two case members are brought into close contact with each other without applying a large pressing load. Since the housing structure with high sealing performance engaged in the state can be realized, sufficient waterproof performance can be achieved without hindering the downsizing and thinning of the electronic device.

(First embodiment)
Next, a first embodiment according to the present invention will be described with reference to the drawings.

(First embodiment of waterproof structure of electronic device)
FIG. 1 is an external view of two case members constituting a casing of an electronic device according to the present invention. The electronic device in the case where a small and thin mobile phone is used as an example of the electronic device to which the present invention is applied. The external appearance of the housing structure of an apparatus is shown. As shown in FIG. 1, the case of a mobile phone which is an example of an electronic device to which the present invention is applied includes a first case member 1 having a protrusion 3 on the outer peripheral portion and a second case member having a groove 4 on the outer peripheral portion. When the first case member 1 and the second case member 2 are engaged with each other, the projection 3 is inserted into the space formed by the groove 4 to form a housing.

  2 and 3 are cross-sectional views showing a first embodiment of an electronic apparatus to which the present invention is applied, both of which are two case members of a first case member 1 and a second case member 2. The outer peripheral part before and behind engagement shows the cross section cut | disconnected by AA 'in FIG. That is, FIG. 2 is a cross-sectional view showing an example of a state where the two case members of the first case member 1 and the second case member 2 of FIG. 1 are not engaged with each other, and FIG. It is sectional drawing which shows an example of the state which two case members, 1 case member 1 and 2nd case member 2, are mutually engaging.

  As shown in FIGS. 2 and 3, in the case structure of the mobile phone which is an example of the electronic apparatus according to the present invention, at least one or more recesses 6 are provided on the bottom surface of the groove 4 of the second case member 2. (The example of FIG. 2 shows an example in which the recesses 6 are provided at both ends of the bottom surface of the groove 4). The side surface of the recess 6 is substantially parallel to the side surface of the groove 4. Here, the surface (side surface and bottom surface) of the groove 4 has a liquid repellent effect on the liquid resin 5 including the recess 6 and becomes a member having rubber elasticity after curing (hereinafter referred to as a rubber elastic member). The film is formed as the liquid repellent film 7. A liquid resin 5 is disposed as a rubber elastic member on the liquid repellent film 7 formed on the surface of the groove 4 of the second case member 2 including the recess 6.

  In a state where the first case member 1 and the second case member 2 are not engaged, the liquid resin 5 (rubber elastic member) disposed in the groove 4 of the second case member 2 is as shown in FIG. The greatest feature of the housing structure (waterproof structure) of the present invention is that the recess 6 does not enter inside the recess 6 formed in the bottom surface of the groove 4 and that a gap exists in the recess 6. ing.

  As described above, after the liquid resin 5 is cured as a rubber elastic member in a state where there is a gap in the recess 6, the first case member 1 and the second case member 2 are engaged with each other. When the protrusion 3 of the first case member 1 is inserted into the groove 4 of the second case member 2, the liquid resin 5 (rubber elastic member) after curing is formed into the protrusion 3 (convex portion) of the first case member 1 as shown in FIG. ), The liquid resin 5 (rubber elastic member) enters the gap in the recess 6 and reaches the state where the first case member 1 and the second case member 2 are completely engaged. Then, the liquid resin 5 (rubber elastic member) is in a state of completely filling the gap in the recess 6.

  Here, when the volume of the liquid resin 5 (rubber elastic member) after curing is not pressed as shown in FIG. 2 and when pressed as shown in FIG. Since it is held the same, the liquid resin 5 (rubber elastic member) is pressed by the same dimension by the projection 3 and pushed down to the bottom surface side of the groove 4 as compared with the case where there is no recess on the bottom surface of the groove 4. The required pressing load can be further reduced.

  With this effect, it is not necessary to increase the rigidity of the first case member 1 and the second case member 2 that are required, and the member thickness of the first case member 1 and the second case member 2 can be further reduced. . Thus, sufficient waterproof performance can be imparted by the liquid resin 5 (rubber elastic member) without hindering the reduction in size and thickness of the electronic device.

  The width and depth of the groove 4 and the width and depth of one or more recesses 6 (two in the case of FIGS. 2 and 3) are the same as the outer dimensions of the first case member 1 and the second case member 2. When the liquid resin 5 is applied on the liquid repellent film 7 formed on the surface of the groove 4, the liquid resin 5 is designed to have a size that does not enter the concave portion 6 side.

Specifically, assuming that the liquid resin 5 enters the recess 6 side horizontally from the position of the bottom surface of the groove 4, the condition of the width R (m) of the recess 6 so that the liquid resin 5 does not enter the recess 6. Is given by the following equation (1).
R <-2Tcosθ / ρgh (1)

Here, T (Nm) is the surface tension of the liquid resin 5, θ is the contact angle of the liquid resin 5 on the liquid repellent film 7 having a liquid repellent effect, ρ is the density (kg / m ³ ) of the liquid resin 5, g is the gravitational acceleration (m / s ² ), and h is the height (m) of the liquid resin 5 present on the recess 6 having the width R.

  The height h of the liquid resin 5, that is, the thickness of the rubber elastic member formed after curing and the width R of the concave portion 6 are determined so as to satisfy the formula (1). The width and depth can be determined. Here, since cos θ needs to be negative in order for the right side of the formula (1) to be a positive value, the liquid repellent film 7 needs to have a contact angle with respect to the liquid resin 5 exceeding 90 degrees. More preferably, it is desirable to use one having a temperature of 100 degrees or more.

  Further, in order to reduce the pressing load when the cured liquid resin 5 (rubber elastic member) is pressed, the liquid resin 5 (rubber elastic member) is pressed against the side surface of the projection 3 of the first case member 1 and the groove at the time of pressing. In consideration of the point that the gap extends to the gap with the side surface of 4, the sum of the volumes of one or more recesses 6 (two in the case of FIGS. 2 and 3) is the first case member 1. It is preferable that the liquid resin 5 (rubber elastic member) that is pressed and deformed by the protrusions 3 (convex portions) has a volume of 80% or more of the deformation amount (the total volume of the deformation). If the depth of the concave portion 6 is large, the depth of the groove 4 including the depth of the concave portion 6 becomes large, which becomes an obstacle to the reduction in size and thickness of the second case member 2. Therefore, the depth of the recess 6 is determined in consideration of the balance between the effect of reducing the pressing load and reducing the size and thickness of the second case member 2.

  As an example, a liquid resin 5 (rubber elastic member) having a thickness, that is, a height h of 0.60 mm is formed on the liquid repellent film 7 formed on the surface of the groove 4 having a width of 1.0 mm and a depth of 1.0 mm. When the liquid resin 5 (rubber elastic member) is pressed from the bottom surface of the groove 4 to a height of 0.45 mm with a projection 3 (convex portion) having a rectangular cross-sectional area with a width of 0.60 mm, the width is 0.20 mm. If two recesses 6 having a depth of 0.20 mm are formed at both ends of the bottom surface of the groove 4, the total volume of the recesses 6 is approximately equal to the deformation amount (total volume of deformation) of the liquid resin 5 (rubber elastic member). About 90% can be secured. Accordingly, the total volume of the recesses 6 has a volume of 80% or more of the deformation amount (total volume of deformation) of the liquid resin 5 (rubber elastic member). The amount of deformation (the total volume of deformation) of the rubber elastic member) can be sufficiently absorbed by the recess 6. As a result, the pressing load on the small and thin case members 1 and 2 can be greatly reduced.

  Here, in the present embodiment shown in FIGS. 2 and 3, two recesses 6 are provided at both ends of the bottom surface of the groove 4. However, the number and positions of the recesses 6 are not limited to such a case. It is sufficient that at least one or more recesses 6 are formed in the width direction of the bottom surface of the groove 4 so as to satisfy (1). In consideration of application to an electronic device that is expected to be small and thin, such as a portable electronic device, it is desirable that the recess 6 has a width and depth of 0.2 mm or less.

  The material of the first case member 1 and the second case member 2 is not particularly limited, and a casing member of a portable electronic device such as polycarbonate or ABS (acrylonitrile / butadiene / styrene copolymer) resin. As a general material, it is possible to apply.

(Embodiment of method for manufacturing waterproof structure of electronic device)
Next, a method for manufacturing a waterproof structure for an electronic device according to a first embodiment of the present invention will be described with reference to FIGS.

  As a method of forming the recess 6 in FIGS. 2 and 3, there is a method of forming the second case member 2 in advance when the width and depth of the recess 6 are about 0.2 mm. When the second case member 2 is molded by molding, a mold corresponding to the recess 6 is formed in advance in the mold, and the second case member 2 is molded following the mold.

  When the width and depth of the concave portion 6 are smaller than 0.2 mm, for example, 0.1 mm or less, the concave portion 6 is formed by using, for example, laser processing or shape transfer by imprinting.

  The liquid repellent film 7 is formed, for example, by applying and drying a treatment liquid in which a fluorine-based polymer is dispersed on the surface (side surface / bottom surface) of the groove 4 including the recess 6. Depending on the processing accuracy of the recess 6, the side surface of the formed recess 6 may be inclined about ± 10 degrees with respect to the side surface of the groove 4. However, even if the side surface of the recess 6 is inclined by about ± 10 degrees, the liquid repellent film 7 is formed on the surface of the groove 4 including the recess 6, so that when the liquid resin 5 (rubber elastic member) is disposed, The liquid resin 5 (rubber elastic member) does not enter the recess 6 after the liquid repellent film 7 is formed.

  Here, before applying the treatment liquid made of the fluoropolymer, in order to improve the permeability of the treatment liquid into the recess 6 and the adhesion of the liquid repellent film 7, the liquid repellent film 7 is formed by, for example, plasma treatment. The process which improves the wettability of the surface of the groove | channel 4 containing the recessed part 6 with respect to is performed.

  The fluorine-based polymer film serving as the liquid repellent film 7 has a small surface energy and has a sufficient liquid repellent effect regardless of the type of the liquid resin 5, but is liquid repellent with respect to the liquid resin 5 applied on the liquid repellent film 7. Any film having an effect can be used without being limited to the fluorine-based polymer.

  The thickness of the liquid repellent film 7 is not particularly limited, but a thickness of 10 μm or less is preferable. This is because the liquid repellent film 7 can be reasonably formed on the surface of the groove 4 including the concave portion 6 by the coating method as described above if the film thickness is in such a range.

  The liquid resin 5 (rubber elastic member) is formed on the liquid repellent film 7 of the groove 4 including the recess 6 by a dispenser, an ink jet, or the like, and is cured as heat or ultraviolet rays to form a member having rubber elasticity. .

  When the liquid resin 5 (rubber elastic member) is applied, the liquid repellent effect as described above prevents the 5 (rubber elastic member) from entering the concave portion 6, and a void is formed on the bottom surface side of the concave portion 6. Since the gap is preserved even after 5 (rubber elastic member) is cured, the waterproof structure according to the present invention is obtained.

  Here, as a kind of the liquid resin 5 (rubber elastic member), rubbers generally used as packing, such as silicone rubber, urethane rubber, isoprene rubber, chloroprene rubber, ethylene propylene rubber, nitrile rubber, and fluorine rubber, are used. Although it can be applied, it is preferable to use silicone rubber as the liquid resin 5 (rubber elastic member) from the viewpoint of easily obtaining a low-hardness member and from the viewpoint of environmental resistance.

  Further, the method of curing the liquid resin 5 (rubber elastic member) is not particularly limited as long as it does not affect the second case member 2, and it is either a heat method including normal temperature curing or an ultraviolet method. Also good.

  The viscosity of the liquid resin 5 that is a stage before curing of the liquid resin 5 (rubber elastic member), that is, the precursor of the member having rubber elasticity, is from the viewpoint of easy application to the groove 4 and prevention of flowing into the recess 6. It is preferably 0.1 to 200 Pa · s, more preferably 1 to 100 Pa · s.

  The hardness of the liquid resin 5 (rubber elastic member) after curing is specified in the JIS-A standard from the viewpoint that it is preferable to reduce the pressing load for deformation so as to fill the gap of the recess 6. The hardness is preferably 30 degrees or less, more preferably 20 degrees or less.

(Second embodiment)
Next, a second embodiment of the waterproof structure for an electronic device according to the present invention will be described with reference to FIG.

  FIG. 4 is a cross-sectional view showing a second embodiment of an electronic apparatus to which the present invention is applied. As the first embodiment, 2 of the first case member 1 and the second case member 2 shown in FIG. The cross section cut | disconnected by AA 'in FIG. 1 about the outer peripheral part before engagement of two case members is shown. That is, FIG. 4 is a sectional view showing an example different from FIG. 2 in a state where the two case members of the first case member 1 and the second case member 2 of FIG. 1 are not engaged with each other.

  As shown in FIG. 4, also in the second embodiment, as in the case of the first embodiment, the surface (side surface and bottom surface) of the groove 4 becomes a member having rubber elasticity after curing. A film having a liquid repellent effect on the liquid resin 5 is formed as the liquid repellent film 7. A liquid resin 5 is disposed as a rubber elastic member on the liquid repellent film 7 formed on the surface of the groove 4 of the second case member 2.

  Here, in FIG. 4, unlike the case of the first embodiment, one or more fine recesses 8 are formed over the entire bottom surface of the groove 4. The side surface of the fine concave portion 8 is substantially parallel to the side surface of the groove 4, and the width and depth of the fine concave portion 8 are smaller than those of the concave portion 6 in FIG.

  Prior to the formation of the liquid repellent film 7, the fine recess 8 is formed using a method such as laser processing or shape transfer by imprinting. The side surfaces of the formed fine recesses 8 are manufactured so as to be substantially parallel to the side surfaces of the grooves 4. However, due to the processing accuracy of the fine recesses 8, the side surfaces of the fine recesses 8 are It may be tilted about ± 10 degrees. However, even if the side surface of the fine recess 8 is inclined by about ± 10 degrees, the liquid repellent film 7 is formed on the surface of the groove 4 including the fine recess 8, so the liquid resin 5 (rubber elastic member) is disposed. At this time, the liquid resin 5 (rubber elastic member) does not enter the fine concave portion 8 after the liquid repellent film 7 is formed.

  As described later, the fine concave portion 8 can be expected to have a waterproof effect without hindering the reduction in size and thickness as the total surface area (that is, the total volume of the fine concave portions 8) increases. A large number of fine recesses of 0.1 mm or less, more preferably 0.05 mm or less are formed over the entire width direction of the groove 4, and the depth of each of the fine recesses is 1 μm or more, more preferably 10 μm or more. To do.

  As in the case of the first embodiment, the liquid repellent film 7 is formed on the surface of the groove 4 including, for example, a treatment liquid in which, for example, a fluorine-based single molecule is dispersed after forming the fine recesses 8. It is formed by applying and drying to (side / bottom). Here, when a treatment liquid in which a fluorine-based polymer is dispersed as in the case of the first embodiment is used, there is a possibility that the shape cannot be maintained depending on the size of the fine recess 8. . Therefore, in order to reduce the film thickness of the liquid repellent film 7, for example, the liquid repellent film 7 is formed by using a treatment liquid in which fluorine-based monomolecules are dispersed as described above or by depositing a fluorine-based polymer on the groove 4 surface. The film thickness of the formed liquid repellent film 7 is preferably several nm to 100 nm.

  Also in the second embodiment, as in the case of the first embodiment, the void formed between the fine recess 8 and the liquid resin 5 (rubber elastic member) is the liquid resin 5 (rubber elasticity) after curing. It is possible to expect an effect that it becomes an escape route when the member is pressed. Furthermore, due to the presence of a large number of fine recesses 8 extending over the entire bottom surface of the groove 4, the liquid resin 5 (rubber elastic member) and the side surface of the groove 4 A large gap 10 can be formed between the bottom surface.

  That is, in the second embodiment, first, the total surface area of the fine recesses 8 formed on the bottom surface of the groove 4 is increased due to the presence of a large number of fine recesses 8. Second, the size of the fine recess 8 is sufficiently smaller than the droplet of the liquid resin 5 (rubber elastic member), thereby contributing to the air layer when the bottom surface of the groove 4 is regarded as a smooth surface. Has increased.

  Due to the above effects, the apparent contact angle of the liquid resin 5 (rubber elastic member) at the bottom surface of the groove 4 in which the fine recess 8 is formed is the contact angle θ at the bottom surface of the groove 4 of the first embodiment shown in FIG. Can be larger. For this reason, the area of the liquid resin 5 (rubber elastic member) in contact with the bottom surface of the groove 4 in which the fine recess 8 of the second embodiment is formed is the bottom surface of the groove 4 of the first embodiment shown in FIG. As a result, the area of the gap at the bottom surface of the groove 4 and in the vicinity thereof can be increased.

  That is, the second embodiment has an advantage that sufficient waterproof performance can be provided without hindering the downsizing and thinning of the electronic device as compared with the first embodiment. .

  As an application example of the electronic device of the present invention, it can be suitably applied not only to a general electronic device expected to be small and thin, but particularly to a portable electronic device. It can be applied as a waterproof structure for portable electronic devices such as UMPC (Ultra Mobile Personal Computer) in addition to smartphones and smartphones.

The configuration of the preferred embodiment of the present invention has been described above. However, it should be noted that such examples are merely illustrative of the invention and do not limit the invention in any way. Those skilled in the art will readily understand that various modifications and changes can be made according to a specific application without departing from the gist of the present invention. For example, the embodiment of the present invention can be expressed as the following configuration in addition to the configuration (1) in the means for solving the problems.
(2) The liquid resin is a rubber elastic member having rubber elasticity after curing, and the bottom surface of the groove forms a gap between the liquid resin disposed on the liquid-repellent film and the concave portion. 1) Waterproof structure of electronic equipment.
(3) The cured liquid resin is deformed by inserting the protrusion of the first case member into the groove of the second case member and pressing the cured liquid resin after the liquid resin is cured. The first case member and the second case member are engaged with the deformed liquid resin in a state where the gap formed between the liquid resin before deformation and the recess is filled. The waterproof structure of the electronic device according to the above (2).
(4) The recesses are disposed at both ends of the bottom surface of the groove, or a plurality of the recesses are disposed over the entire bottom surface of the groove, and the side surface of the recess is substantially parallel to the side surface of the groove. The waterproof structure of the electronic device according to any one of (1) to (3).
(5) The waterproof structure for an electronic device according to any one of (1) to (4), wherein the recess has a width of 0.20 mm or less.
(6) The waterproof structure of the electronic device according to any one of (1) to (5), wherein the liquid repellent film is made of a fluorine-based polymer or a fluorine-based single molecule.
(7) The waterproof structure for an electronic device according to any one of (1) to (6), wherein the liquid resin is silicone rubber.
(8) The waterproof structure of the electronic device according to any one of (1) to (7), wherein the electronic device is a portable electronic device represented by a mobile phone, a smartphone, or a UMPC (Ultra Mobile Personal Computer).
(9) An electronic device that forms a housing of an electronic device by engaging the outer peripheral portions of the first case member and the second case member that are divided into two, and prevents liquid from entering the housing. A method for manufacturing a waterproof structure of a device, wherein a protrusion forming step for forming a protrusion on an outer peripheral portion of the first case member, and a groove for forming a groove for inserting the protrusion on the outer peripheral portion of the second case member A forming step; a recess forming step for forming at least one recess on a bottom surface of the groove; and a liquid repellent for forming a liquid repellent film having a liquid repellent effect on a liquid resin on the surface of the groove including the recess. A method for manufacturing a waterproof structure of an electronic device, comprising at least a film forming step and a liquid resin disposing step of applying and curing the liquid resin on the liquid repellent film formed in the groove.
(10) The method for manufacturing a waterproof structure for an electronic device according to (9), wherein in the recess forming step, the recess is formed using any one of mold forming, laser processing, or shape transfer by imprint.
(11) In the liquid repellent film forming step, a treatment liquid in which a fluorinated polymer or a fluorinated monomolecule is dispersed is applied to the surface of the groove including the recess, or dried, or the fluorinated polymer is The method for producing a waterproof structure for an electronic device according to (9) or (10), wherein the liquid-repellent film is formed on the surface of the groove including the recess by vapor deposition on the surface of the groove including the recess.
(12) The method for manufacturing a waterproof structure for an electronic device according to any one of (9) to (11), wherein the liquid resin disposed on the liquid repellent film in the liquid resin disposing step is silicone rubber.
(13) In the liquid resin placement step, after applying a silicone rubber, which is a material of the liquid resin, on the liquid-repellent film by a dispenser or an ink jet, the liquid resin is cured by heat or ultraviolet rays to have rubber elasticity. (12) The waterproof structure manufacturing method of the electronic device according to (12) formed as a member.

DESCRIPTION OF SYMBOLS 1 1st case member 2 2nd case member 3 Protrusion 4 Groove 5 Liquid resin (rubber elastic member)
6 Concave portion 7 Liquid repellent film 8 Fine concave portion 10 Gaps

Claims (13)

The first case member is divided into two and consists of a second case member, a housing outer periphery of each other and the second casing member and the first case member to have a structure which engages,
A protrusion formed on the outer periphery of the first case member;
A groove formed in the outer peripheral portion of the second case member for inserting the protrusion when engaging the outer peripheral portions with each other;
At least one recess formed on the bottom surface of the groove;
A liquid repellent film formed on the surface of the groove including the recess,
A liquid resin disposed on the liquid repellent film in a state having a void in the recess ,
The waterproof structure of an electronic device, wherein the liquid repellent film is a film having a liquid repellent effect on the liquid resin.   The waterproof structure for an electronic device according to claim 1, wherein the liquid resin is a rubber elastic member having rubber elasticity after being cured.   By deforming the liquid resin after curing by inserting the protrusion of the first case member into the groove of the second case member after the liquid resin is cured and pressing the liquid resin after curing, Engaging the first case member and the second case member with the deformed liquid resin filling the gap formed between the liquid resin before deformation and the recess. The waterproof structure for an electronic device according to claim 2, wherein the electronic device has a waterproof structure. The concave portions are arranged at both ends of the bottom surface of the groove, or a plurality of the concave portions are arranged over the entire bottom surface of the groove, and the side surface of the concave portion is substantially parallel to the side surface of the groove. waterproof structure of electronic equipment according to any one of claims 1 to 3.   The waterproof structure for an electronic device according to claim 1, wherein the recess has a width of 0.20 mm or less.   6. The waterproof structure for an electronic device according to claim 1, wherein the liquid repellent film is made of a fluorine polymer or a fluorine monomolecule.   The waterproof structure for an electronic device according to claim 1, wherein the liquid resin is silicone rubber.   The waterproof structure for an electronic device according to any one of claims 1 to 7, wherein the electronic device is a portable electronic device represented by a mobile phone, a smartphone, or an UMPC (Ultra Mobile Personal Computer). A method for manufacturing a waterproof structure for an electronic device, wherein the outer case of the first case member and the second case member divided into two are engaged with each other to form a housing of the electronic device,
A projection step of forming a projection on an outer peripheral portion of the first cases member,
A groove forming step of forming a groove for inserting the protrusion on an outer peripheral portion of the second case member;
A recess forming step for forming at least one recess on the bottom surface of the groove;
A liquid repellent film forming step of forming a liquid repellent film having a liquid repellent effect on the liquid resin on the surface of the groove including the concave portion;
A liquid resin disposing step of applying and curing the liquid resin on the liquid repellent film in a state having a void in the recess ;
A method for producing a waterproof structure for an electronic device, comprising:   10. The method for manufacturing a waterproof structure for an electronic device according to claim 9, wherein, in the recess forming step, the recess is formed by using any one of mold forming, laser processing, or shape transfer by imprinting.   In the liquid repellent film forming step, a treatment liquid in which a fluorinated polymer or a fluorinated monomolecule is dispersed is applied to the surface of the groove including the recess, or dried, or the fluorinated polymer is applied to the recess. 11. The waterproof structure manufacturing method for an electronic device according to claim 9, wherein the liquid-repellent film is formed on a surface of the groove including the concave portion by vapor deposition on a surface of the groove including the electronic device.   12. The method for manufacturing a waterproof structure of an electronic device according to claim 9, wherein the liquid resin disposed on the liquid repellent film in the liquid resin disposing step is silicone rubber.   In the liquid resin placement step, a silicone rubber that is a material of the liquid resin is applied on the liquid-repellent film by a dispenser or an ink jet, and then the liquid resin is cured by heat or ultraviolet rays to form a rubber-elastic member. The waterproof structure manufacturing method for an electronic device according to claim 12, wherein:

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