JP3962004B2 - Resin molded waterproof case material - Google Patents

Description

  The present invention relates to a resin-molded waterproof case member that can be ventilated between the inside and outside of a case member but is required to have a function of preventing liquid such as water droplets from entering the inside.

  Examples of the case member include a case in which electronic and / or electrical equipment is housed, for example, an ECU (Engin Control Unit) case for controlling a vehicle engine, a street light case, and the like.

  As an ECU case, there is one described in Patent Document 1. The case member is integrally attached to an end portion on the inner side of a vent hole formed in the bottom plate portion, which allows a gas to pass but prevents a liquid from passing therethrough. In this case member, if an unexpected situation occurs, for example, if the car is washed with high-pressure water, water droplets adhere to the case member, and in particular, if the water droplets that have entered the vent holes cover the entire surface of the vent film, Ventilation is impossible between inside and outside.

  In particular, when the temperature inside the case member decreases with water droplets covering the entire surface of the gas permeable membrane, the pressure inside the case member becomes negative due to this, and water droplets adhering to the entire surface of the gas permeable membrane are removed from the case member. It is possible to forcibly inhale inside. If water drops are sucked into the case member, there is a risk of causing rusting or malfunctioning of internal equipment.

Further, when the inside of the end of the normal vent in the structure of only fitted with gas permeable membrane, water droplets adhering to the outer membrane surface of the passing air film enters the vent of the vent If the sum of the adhesion forces on the wall surface and the outer membrane surface of the ventilation membrane is greater than the gravity acting on the water droplets etc., the water droplets etc. in the ventilation holes will not be discharged only by gravity due to the inclination of the case member, It will be in the state which covered the ventilation membrane. Here, adhesion of water droplets to the vent entire surface, which occurs when the adhesion of water droplets against the inner wall surface of the surface and the vents of the vent film is greater than the gravity acting on the water droplets or the like, or are balanced it is conceivable that.
JP 2002-146087 A

  It is an object of the present invention to provide a case member capable of draining water droplets and ensuring the ventilation performance of the air-permeable membrane even if the entire surface of the air-permeable membrane that blocks the air vent in an unexpected situation as described above is covered with water droplets. Yes.

The invention of claim 1 for solving the aforementioned problem, the vent hole penetrating the case member in the inner and outer direction is formed on a part of the sealing case member devices generate heat during operation are accommodated therein, wherein While gas is transmitted to the vent periphery around the vents liquid gas permeable membrane does not transmit is engaged against, the non-identical axial center direction of gravity above the previous SL vent Te state odor use of the case member An injection-molded resin-molded waterproof case member used at a position facing the direction, wherein the air-permeable membrane has one side of the air-permeable membrane formed on the inside of the case member and the peripheral edge of the air hole when the case member is injection-molded. The vent hole is formed by continuously forming a straight tubular inner peripheral wall portion located on the inner side and a mortar-shaped inner peripheral wall portion that expands outward from the straight tubular inner peripheral wall portion. And the outside of the gas permeable membrane A membrane contact prevention portion that extends from the peripheral portion of the hole in contact with the outer surface of the gas permeable membrane and extends in a direction crossing the vent hole is formed integrally with the peripheral portion of the vent hole. Concave groove-shaped water guide grooves extending continuously from the straight tubular inner peripheral wall portion of the peripheral edge of the pore to the outer surface of the case member are radially formed around the axis of the vent hole by the injection molding. And the depth of the water guide groove is such that a capillary phenomenon occurs in the water droplets in contact with the water guide groove to move the water droplets to the bottom surface of the water guide groove, and to the outer surface of the case member along the water guide groove. it is characterized in that it is formed to a depth that can be moved.

Even if water (water droplets) enters the ventilation hole due to an unexpected situation and closes the ventilation membrane, the axis of the ventilation hole is formed in the same direction as the upper side of the gravity direction, and the inner wall of the ventilation hole water guide groove toward the outer wall surface be formed, before Kisui (water droplets) is to be drained is led to the water guide groove on the outside of the case member, it is not the function of the vent hole is impaired. In addition, as described above, a plurality of water guide grooves are formed radially on the inner wall surface of the vent hole as viewed from the outside of the vent hole, so that it is commonly used for case members having different mounting directions. it can. Since the tapered portion of the above shape is formed in the portion near the outer surface side of the vent hole, the water droplets attached to the inner wall surface of the vent hole and reaching the outer surface side are less supported from below in the direction of gravity. Therefore, it becomes easy to drain to the outside of the vent hole. In addition, to form the vent hole as described above, when the case member is molded by resin injection, the base part of the convex part for forming the vent hole in the molding die is formed in an inverted shape with the tapered part of the vent hole. It can be formed easily at the same time as injection molding .

Further, the invention of claim 2, in the invention of claim 1, said water guide groove is characterized in that are made form to be continuous over the outer wall surface of the case member from the inner wall surface of the vent.

  According to the invention of claim 2, in addition to the effect of the invention of claim 1, the water droplets that have entered the vent hole enter the water guide groove by capillary action, and then, on the outer surface side of the vent hole by gravity action. When the water droplets move and a part of the water droplets reaches the outer end of the vent hole, the water droplets fall down below the case member due to the gravitational action. For this reason, it is difficult for water droplets to accumulate in the vent hole, and the entire surface of the vent film is prevented from being covered with water droplets. In addition, the above-described water guide groove only forms the concave water guide groove shape and the inverted ridges on the corresponding part of the molding die (the convex part for forming the vent hole) when the case member is subjected to resin injection molding. Thus, it can be easily formed simultaneously with injection molding.

Further, the invention of claim 3, in the invention of claim 1 or 2, wherein the water guide groove is characterized in that the rough surface is formed with a fine paddle irregularities.

According to the invention of claim 3 , in addition to the function and effect of the invention of claim 1 or 2 , the surface of the water guide groove is roughened, and the surface area is increased by fine irregularities. Therefore, in order to spread the water droplets entered the water guide groove, it is easy to flow the water guide groove, and falls downward of the case member at the outer end of the water guide groove. In addition, the roughening of the water guide groove can be achieved by simply forming the roughened surface and the inverted shape of the unevenness on the corresponding part of the mold (the convex part for forming the air hole) at the time of injection molding of the case member. Can be molded easily at the same time as injection molding.

According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the waterproof case member is disposed so that a membrane surface of the gas permeable membrane is substantially vertical in use. .

According to the invention of claim 4 , in addition to the operational effects of the invention of any one of claims 1 to 3 , the waterproof case member is disposed so that the membrane surface of the ventilation membrane is substantially vertical. The adhering water droplets are easily subjected to the gravitational action, and are guided to the water guide groove and effectively drained to the outside of the vent hole.

The invention of claim 5 is characterized in that, in any one of the inventions of claims 1 to 4, a water repellent treatment is applied to the outer membrane surface of the gas permeable membrane.

According to the invention of claim 5 , in addition to the function and effect of any of the inventions of claims 1 to 4 , water droplets that enter the vent hole and adhere to the vent film repel (extrude) outward from the vent film. ) Receive power. That is, since the “wetting property” on the outer side of the gas permeable membrane is reduced, the effect of preventing adhesion of water droplets to the gas permeable membrane is enhanced.

The waterproof case member according to the present invention is formed in a position where the axial center of the vent hole is not in the same direction as the upper side in the gravitational direction in the state of use, and extends from the inner wall surface of the vent hole to the outer wall surface of the case member. A water guide groove is formed to guide the drained water to the outside of the case member and drain the water . For this reason, even if the entire surface of the gas permeable membrane is covered with water droplets due to an unforeseen situation, the water droplets are led to the outside of the air holes by the water guide grooves and drained. For this reason, even if a waterproof case member is used in an environment in which water drops may adhere to the gas permeable membrane, the original gas permeable performance of the gas permeable membrane can be ensured.

Hereinafter, embodiments suitable for the practice of the present invention, and by way of other forms, further illustrate the present invention.

1 is a perspective view of a waterproof case K according to the present invention as viewed from the bottom surface side, FIG. 2 is a cross-sectional view of the waterproof case K in which the bottom surface is horizontally arranged, and FIG. 3 is a vent hole of FIG. 4 is an enlarged cross-sectional view of a portion 24, FIG. 4 is an enlarged front view of the vent hole 24, and FIG. 5 is a portion of the vent hole 24 of the waterproof case K vertically arranged with the connector portion 14 upward in the gravity direction. It is the expansion perspective view which fractured | ruptured a part of. 1 to 5, a waterproof case K according to the present invention includes a case body 10 and a bottom lid body 20 each having a rectangular box shape. When the waterproof case K is used in a horizontal arrangement, the bottom surface of the case body 10 is open, and a wiring such as a printed circuit board, the board 1, the electronic component 2 and the like are placed in the housing space 11 inside the case body 10. After housing the necessary equipment, the bottom opening is airtightly covered with the bottom lid 20. As shown in FIG. 2, the case body 10 and the bottom cover body 20 are the same in which a rectangular frame-shaped convex portion 12 formed on the lower end surface of the case body 10 is formed on the corresponding end surface of the bottom cover body 20. In a state of being fitted in the concave portion 21 having a shape, the airtightness and the watertightness are maintained and the members are integrally joined. As an integral joining means, fixing with an adhesive / sealant having adhesiveness is generally preferred, but it is screwed or clipped via an additional sealant such as an O-ring or rubber packing. It can also be fixed by structure, vibration welding, ultrasonic welding or the like. Is to that constitutes the bottom portion of this embodiment Deke over scan body 10 separately from the bottom lid 20 of the shape or position of the contained object, under the case body 10 than the upper opening of the case body 10 or a is easier to insert placing contained object from the side, or be one exemplified as if unable inserted not from below, facilitates insertion of the contained object from the lower side of the case the body 10 There is an advantage to become. However, if the contained object is not require insertion arrangement from the lower an insertable disposed from the upper side of the case body 10 includes a case body 10 having a box shape may be integral with the bottom lid 20 .

Upper opening of the case body 10 is covered to hold the same airtight and watertight bottom lid 20 that describes front by the upper cover member 13, when the case body 10 and the upper cover member 13 of the bottom lid 20 Are joined together in the same manner. Here upper lid body 13, when the contained object is a device that generates heat during operation, it is preferably made of a metal heat radiator such as a plate-shaped aluminum in order to achieved the release heat function. In this case, the upper lid 13 is in contact with the object to be accommodated through an insulating sheet having thermal conductivity. Furthermore, the upper cover member 13 as shown in FIG. 2, it is preferable to form an uneven portion 13a in order to enhance the heat radiation performance by increasing the surface area of the front side (the outside of the case). If the upper lid 13 is made of a metal radiator, an excessive temperature rise and thermal expansion of the air in the case main body 10 can be suppressed due to a good heat dissipation effect. The deformation force acting on the portion where the upper lid 13 and the upper lid 13 are joined in an airtight manner is reduced, and the burden for holding the joined portion can be reduced. Further , a cylindrical connector portion 14 is integrally formed on one side surface of the case body 10 so as to protrude outward, and a part of the connector portion 14 is embedded when the case body 10 is molded. The outer portions of the plurality of metal plate terminals 3 integrally formed in the above are accommodated, and the inner portions of the terminals 3 are connected to the substrate 1. An electronic component 2 is mounted on the back surface of the upper lid 13, and the electronic component 2 and the substrate 1 are connected by a connection terminal 4. In FIG. 2, reference numeral 5 denotes a protruding boss that fixes the substrate 1 to the flange portion 12 a on the upper surface of the case body 10.

  The portion of the case body 10 excluding the top lid 13 and the bottom lid 20 are all hard such as PBT (polybutylene terephthalate), PA (nylon), PPS (polyphenylene sulfide) with or without glass fibers. It is formed of a thermoplastic resin. The bottom lid 20 may be formed by injection molding with a soft thermoplastic material such as elastomer, TPO or a soft thermosetting resin such as rubber in addition to the above materials. It has a high adhesiveness and can easily provide airtightness and watertightness.

The bottom lid 20 has a shallow box shape, and a circular protrusion projects toward the opening surface of the case body 10 at the center inside the bottom plate portion 22 of the bottom lid 20 to form a vent hole forming portion. 23. A vent hole 24 having a substantially circular cross section is formed in the vent hole forming part 23 so as to penetrate in the inner and outer directions of the waterproof case K. As shown in FIG. 3, the outer side of the vent hole 24 is widened at the inner straight portion 24 a having a constant inner diameter and the outer portion of the entire thickness of the vent hole forming portion 23 at about ３. And a tapered portion 24b formed in such a tapered shape. A connecting portion (boundary portion) between the straight portion 24a and the tapered portion 24b of the vent hole 24 is formed with a smooth curved surface in order to improve the drainage of the water droplets W described later. The tapered portion 24b is formed in the vent hole 24 because water drops W adhering to a vent film S described later due to an unexpected situation easily fall down the waterproof case K along the inner wall surface 24c of the vent hole 24 (drained). This is to make it easier. The end of the inner side along the inner and outer direction of the vent holes 24 are formed vents periphery 23a, integrally breathable film S and the vent hole peripheral portion 23a so that the inner surface and the same surface of the vent hole forming portion 23 It is joined. Breathable film S is, by previously set in advance in the corresponding portion of the formed shape type during the resin injection molding Sokofutatai 20, they are joined together and Sokofutatai 20 during resin injection molding Sokofutatai 20 . Further, the outer portion of the gas permeable membrane S in the inner / outer direction includes three membrane contact preventing portions 25 formed radially from the central portion of the gas permeable membrane S (the same position as the axial center C of the gas permeable holes). 23 and are arranged are integrally formed, to support the passing Kimaku S during use, external of the article is to protect the passing Kimaku S to prevent direct contact with the gas permeable membrane S. Incidentally, 26 of FIG. 3, formed by the mold of the annular projection (both not shown) to set in a state of being positioned through Kimaku S when resin injection molding Sokofutatai 20 molded It is an annular groove that is one of the marks.

Breathable film S is almost spongy when viewed microscopically, atmospheric of the inner portion has a myriad of fine pores facing irregular direction at irregular shape of about 0.05Myuemu～20myuemu. Drunk through Kimaku S, the moisture in the air is 0.0004μm size, steam and than this small atmospheric gas (nitrogen gas, oxygen gas) is to pass, the size is 100 [mu] m (approximately the size of drizzle) It has the performance of blocking the passage of liquids such as water droplets and oil droplets and solid foreign matters such as dust. As this air-permeable membrane S, US W. L. The product name “Gore-Tex” from Gore, the product name “Micro-Tex” from Nitto Denko Co., Ltd., etc. are commercially available and can be suitably used. A material Yes shift also polytetrafluoroethylene resin of the gas permeable membrane, the thickness of a available those 50Myuemu～200 [mu] m according to the purpose, can be selected and used these as appropriate.

  Further, it is preferable that a water repellent treatment is performed on the outer membrane surface of the gas permeable membrane S so as not to impair the air permeability by fluorine coating, Teflon (registered trademark) coating, or the like. As described above, when the water repellent treatment is performed on the outer membrane surface of the gas permeable membrane S, the “wetting property” of the water droplets with respect to the membrane surface is reduced, and a force to repel (push out) the water droplets to be attached is generated. The peripheral edge of the water droplet tends to be separated from the membrane surface of the gas permeable membrane S. Due to the above-described actions resulting from the water-repellent treatment, water droplets and the like are less likely to adhere to the membrane surface of the air-permeable membrane S. It becomes easy to drain to the outside of the vent hole 24.

In the present embodiment, a plurality of concave water guide grooves 27 are formed radially at equal intervals along the circumferential direction from the inner wall surface 24 c of the vent hole 24 to the outer surface of the bottom plate portion 22 of the bottom lid 20. ing. That is, as shown in FIG. 4, when viewed from a direction perpendicular to the bottom plate portion 22 of the vent hole 24 Sokofutatai 20, the bottom lid from the inner wall surface 24c of the water guide groove 27 of the several double the vents 24 It extends to the bottom plate portion 22 of 20 and is formed in a radial shape about the axis C of the vent hole 24. The water guide groove 27 includes a first water guide groove portion 27 a formed on the inner wall surface 24 c of the vent hole 24 and a second water guide groove portion 27 b formed on the bottom plate portion 22 of the bottom cover body 20. And the connection part (boundary part) of each 2nd water guide groove part 27a, 27b is formed in the smooth curved surface shape so that a water drop etc. may flow smoothly and it may drain. The plurality of water guide grooves 27 are formed radially as described above when the bottom cover 20 is mounted horizontally or close to the horizontal direction around the inner wall surface 24c of the vent hole 24. This is because water droplets and the like that have entered the vent hole 24 can be easily drained through the inner wall surface 24c at any position along the direction so that the water droplets and the like that have entered the vent hole 24 can be drained. .

The depth of the water guide groove 27 with respect to the inner wall surface 24c of the vent hole 24 and the outer surface of the bottom plate portion 22 of the bottom lid 20 is as follows . Bottom 27c of the guide Mizumizo 27 (first water guide groove 27a) is tapered such away with respect to the axis C of the vent hole 24 toward the outside of the to case K. In other words, the bottom surface 27c of the first water guide groove 27a is inclined so as to expand in the radial direction toward the outer surface of the bottom plate portion 22 of the bottom lid 20. The first water guide groove portion 27 a is deeper as it goes to the outside of the vent hole 24 with reference to the inner wall surface 24 c of the vent hole 24. As a result, an action of drawing water droplets or the like moving along the inner wall surface 24c of the vent hole 24 toward the outside of the vent hole 24 to the bottom surface 27c of the first water guide groove portion 27a due to capillary action occurs, and the water droplets or the like are easily drained. Become. On the other hand, in the bottom plate portion 22 of the bottom lid body 20, the depth of the water guide groove 27 (second water guide groove portion 27b) is constant.

  In order to form the tapered portion 24 b in the outer portion of the vent hole 24, or to form the water guide groove 27 from the inner wall surface 24 c of the vent hole 24 to the outer surface of the bottom plate portion 22 of the bottom lid body 20, the bottom lid body 20. It can be easily formed at the time of injection molding. That is, as shown in FIG. 6, the base portion of the convex portion 41 forming the vent hole 24 of the molding die 40 for resin injection molding of the bottom lid 20 is formed in the inverted shape of the tapered portion 24b. By forming the water guide groove 27 and the inverted protrusion 42 from the outer peripheral surface of the convex portion 41 to the molding surface of the molding die 40, it can be easily formed. 2 and 3, reference numeral 28 denotes a locking claw of the bottom cover body 20 that is locked to the outer peripheral edge of the case body 10 in a state where the bottom cover body 20 is integrally assembled to the case body 10.

The mounting posture (arrangement posture) when the above-described waterproof case K is attached to a vehicle or the like may be different depending on the situation of the mounted portion. For example, as shown in FIG. 2, the case where the waterproof case K is attached horizontally with the bottom lid 20 positioned downward in the gravity direction will be described. In a normal use state, the general action of the gas permeable membrane S constituting the waterproof case K is as follows. Because the breathable film S is impermeable to liquid such as water droplets rain water, water droplets or the like electronic component 2, or does not intruding into the accommodation space 11 that accommodates the other devices. Internal since breathable film S is vapor body (gas) transmits, the electronic component 2 is a contained object in the accommodating space 11, or another device generates heat during operation, the air in the accommodating space 11 is expanded even when a high pressure expansion gas is discharged to the outside through the through Kimaku S and vent 24, the pressure in the accommodation space 11 keeps the same atmospheric pressure. Accordingly, since the gas permeable membrane S is the pressure in the yield capacity space 11 by the action of transmitting the gas is prevented from rising excessively, the joint between the case body 10 and Sokofutatai 20, or breathable film S The force accompanying the pressure increase does not act on the joint portion of the, and an appropriate joined state can be maintained for a long time. Conversely, there is no heat generated from the electronic component 2 like the operation of the device is yield capacity to stop, when the internal air with the cooling shrinks the air taken in from the outside through the vent hole 24 and the vent film S Thus, the internal space 11 maintains the same pressure as the atmospheric pressure.

However, where the state of water droplets on the entire surface of the outer surface of through Kimaku S enters the water drops into the vent hole 24 due to unforeseen circumstances adheres persists, no longer achieves the breathable gas permeable membrane S, the internal temperature When the pressure drops, the internal pressure becomes negative, and a force is generated to force the water droplets adhering to the outer surface of the gas permeable membrane S into the inside. However, in the waterproof case K of the present invention, a plurality of water guide grooves 27 are formed radially from the inner wall surface 24c of the vent hole 24 to the outer surface of the bottom plate portion 22 of the bottom lid body 20, so as shown in FIG. the water droplets W adhering to the outer peripheral portion of the vent film S is the outer surface side of the vent 24 along the water guide groove 27 by gravity enters the nearest water guide groove 27 (first water guide groove 27a) by hair capillary phenomenon After moving, it moves to the water guide groove (second ventilation groove portion 27b) formed on the outer surface of the bottom plate portion 22 in a state connected to the first water guide groove portion 27a [see FIG. 8]. When a part of the water droplet W reaches the outer end of the water guide groove (second water guide groove portion 27b), it falls below the waterproof case K due to gravity (see FIG. 9). As described above, when the water droplets W adhering to the outer peripheral portion of the gas permeable membrane S enter the water guide groove 27 (first water guide groove portion 27a) by the capillary phenomenon, the contact area with the inner wall surface 24c of the vent hole 24 increases. Further, the adhesion force of the water droplet W to the inner wall surface 24c of the vent hole 24 becomes small and the water is easily drained. By these actions, the water droplets W adhering to the gas permeable membrane S are separated from the gas permeable membrane S and drained outside the air holes 24. When the waterproof case K is mounted horizontally, the water guide groove 27 exists in the vicinity of the water droplet W adhering to the outer peripheral portion of the gas permeable membrane S at any position in the circumferential direction of the gas permeable membrane S. Therefore, the water droplets W adhering to the outer peripheral portion of the gas permeable membrane S are drained to the outside of the vent hole 24 by the action of any one of the water guide grooves 27. For this reason, since all the membrane surfaces of the gas permeable membrane S are temporarily covered with the water droplets W, they are drained immediately, so that the above-mentioned general action of the gas permeable membrane S cannot be solved.

Further, when the waterproof case K is vertically attached with the connector portion 14 facing upward, the membrane surface of the gas permeable membrane S is disposed in the vertical direction in the direction of gravity, as shown in FIGS. 5 and 10 to 12. the way, the gas permeable membrane by gravity action water drop W is attached to the S after moving downward along the gas permeable membrane S, in one or a plurality of water guide grooves 27 close to the vertical direction exist in the near side enter by capillary action (see Figure 10), further moves downward along the water guide groove 27 (see FIG. 11), at the lower end of the water guide groove 27, along the outer surface of the Sokofutatai 20 by gravity fall to (See FIG. 12). Moreover, the part near the outer side of the vent hole 24 is formed in a taper shape, and the force to support the water droplet W reaching this part from below is reduced. Thus, when the waterproof case K is arranged vertically, the membrane surface of the gas permeable membrane S is vertical, and the one or more water guide grooves 27 connected at the lower end of the gas permeable membrane S are also perpendicular or nearly vertical. because it is located in, for hand heavy force acts most effectively upon movement of water droplets, water droplets W adhering to the gas permeable membrane S there is likely advantage is drained to the outside of the vent 24.

  Further, when the waterproof case K is vertically arranged with the connector portion 14 facing sideways, one or more water guide grooves 27 different from the above are in a vertical state or nearly vertical state, and the water guide grooves 27 are The water droplets W that have traveled and adhere to the air-permeable membrane S move downward and are drained from the air holes 24.

In the first embodiment, the vent hole 24 is composed of an inner straight portion 24a and an outer mortar-shaped tapered portion 24b. Therefore, advantage enhances the drainage of the water drop W there Ru in any arrangement.

Further, the first embodiment is an example in which a plurality of water guide grooves 27 toward the outer surface of the bottom plate portion 22 of the bottom cover 20 from the inner wall surface 24c of the vents 24, in addition to the water guide groove 27, the vent hole Even if the entire inner wall surface 24c of 24 is formed into a rough surface having fine irregularities by, for example, matte finishing, the water conductivity of the water droplets W transmitted through the inner wall surface 24c of the vent hole 24 can be increased. Result the surface area of the entire fine irregularities formed is that the by Ri before Symbol inner wall surface 24c of the inner wall surface 24c of the vent holes 24 increases, the total contact area of the water drop W against the inner wall surface 24c is increased, the inner wall surface 24c The surface tension of the water droplet W with respect to is reduced. For this reason, combined with the gravity action, the drainage performance when water droplets away from the membrane surface of the ventilation membrane S is drained through the inner wall surface 24c of the ventilation hole 24 is enhanced. Further, by forming a surfactant layer from the inner wall surface 24 c of the vent hole 24 to the outer surface of the bottom plate portion 22 of the bottom lid 20, the water droplet W collected in the vent hole 24 can be improved by increasing the fluidity of the water droplet. Drainage can be improved.

It is the perspective view which looked at the waterproof case K which concerns on this invention from the bottom face side. It is sectional drawing of the waterproof case K by which the bottom face was horizontally arrange | positioned. FIG. 3 is an enlarged cross-sectional view of a portion of a vent hole 24 in FIG. 2. 3 is an enlarged front view of a vent hole 24. FIG. It is the expansion perspective view which fractured | ruptured a part of part of the vent hole 24 of the waterproof case K arranged vertically. FIG. 4 is an enlarged perspective view of a portion of the bottom lid body 20 where a molding hole 24 is molded. FIG. 6 is a schematic cross-sectional view showing a state in which a part of a water droplet W adhering to a gas permeable membrane S enters a water guide groove 27 by a capillary phenomenon when the waterproof case K is horizontally arranged. Similarly, it is a schematic cross-sectional view showing a state in which water droplets W that have entered the water guide groove 27 move along the water guide groove 27. Similarly, it is a schematic cross-sectional view showing a state in which water droplets W that have entered the water guide groove 27 fall at the end of the water guide groove 27. FIG. 5 is a schematic cross-sectional view showing a state where a part of a water droplet W adhering to a gas permeable membrane S enters a water guide groove 27 by a capillary phenomenon when a waterproof case K is vertically arranged. Similarly, it is a schematic cross-sectional view showing a state in which water droplets W that have entered the water guide groove 27 move along the water guide groove 27. Similarly, it is a schematic cross-sectional view showing a state in which water droplets W that have entered the water guide groove 27 fall at the end of the water guide groove 27.

Explanation of symbols

C: Axle axis
K: Waterproof case (case member)
S: Breathable membrane
W: Water drop
2: Electronic components
10: Case body (case member)
11: Containment space
20: Bottom lid (case member)
24: Ventilation hole
24a: Straight part of vent hole ( straight tubular inner peripheral wall part )
24b: Tapered part of vent hole ( inner bowl-shaped inner peripheral wall part )
25: Membrane contact prevention part
24c: Inner wall surface of the vent hole
27: Water guide groove

Claims (5)

A vent hole that penetrates the case member inwardly and outwardly is formed in a part of the sealed case member in which a device that generates heat during operation is accommodated.
Wherein at gas transmits to vent the periphery around the vents liquid gas permeable membrane does not transmit is engaged against,
A resin molded waterproof case member which is injection molded is used at a position where the axis are in the direction to become a non-identical direction of gravity above the previous SL vent Te state odor use of the case member,
When the case member is injection-molded, the one side of the breathable membrane is integrally joined with the peripheral edge of the vent hole inside the case member,
The vent hole is formed by continuously forming a straight tubular inner peripheral wall portion located on the inner side and a mortar-shaped inner peripheral wall portion expanding outward from the straight tubular inner peripheral wall portion,
A membrane contact prevention portion extending from the peripheral portion of the vent hole to the outer surface of the vent membrane and extending in a direction crossing the vent hole is formed integrally with the vent peripheral portion on the outside of the vent hole,
On the inner peripheral wall portion of the vent hole, a concave groove-shaped water guide groove extending from the straight tubular inner peripheral wall portion of the peripheral edge portion of the vent hole to the outer surface of the case member continuously from the scallop-shaped inner peripheral wall portion is provided. A plurality of radial shapes are formed around the axial center of the vent hole by molding,
The depth of the water guide groove can cause capillary action on the water droplets in contact with the water guide groove to move the water droplets to the bottom surface of the water guide groove and to move along the water guide groove to the outer surface of the case member. Formed to a depth,
An injection-molded resin-molded waterproof case member. The water guide groove, the resin molded waterproof case member according to claim 1, characterized in that it is made form so as to be continuous over the outer wall surface of the case member from the inner wall surface of the vent. Wherein the water guide groove, the resin molded waterproof case member according to claim 1 or 2, characterized in that roughened surface having fine paddle irregularities are formed. The resin-molded waterproof case member according to any one of claims 1 to 3 , wherein the waterproof case member is disposed so that a membrane surface of the gas permeable membrane is substantially vertical in use. Said breathable film resin molded waterproof case member according to any one of claims 1 to 4 on the outside of the membrane surface, characterized in that the water-repellent treatment is applied for.

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