JP5570568B2 - Waterproof electronic equipment housing for vehicles - Google Patents

Description

  The present invention relates to a vehicle-mounted waterproof electronic device casing. More specifically, it has a waterproof sealing function with a simple structure without using a waterproof sealant at the connection between the case body and the cover that closes the opening. It is suitably used for an electronic device casing.

BACKGROUND ART A vehicle wireless reception device includes an in-vehicle wireless reception device including a reception antenna that receives a wireless signal from a portable device possessed by a user in a vehicle body frame. Such a vehicle-mounted wireless receiver needs to be waterproofed from water droplets generated in the passenger compartment.
It is desirable to reduce the number of parts of waterproof electronic equipment casings mounted on automobiles from the viewpoints of weight reduction, assembly workability, and reduction of environmentally hazardous substances. In recent years, higher performance of automobiles and lower fuel consumption have been realized. As a means for achieving this, from the reduction of the mounting space accompanying the weight reduction of the vehicle, there has been a demand for a reduction in the size and thickness of the housing in order to ensure a high layout property for an automobile.
Furthermore, even in the case of an electronic device casing mounted in a vehicle interior, a waterproof electronic device casing is preferably used in order to adapt to the variety of layout and usage environment conditions. The water resistance required here is simple waterproofing with a simple structure and waterproof sealing function, which aims to prevent or make it difficult for water droplets generated in the passenger compartment to enter the interior of the electronic device housing. It is what.

In general, as shown in FIG. 7 (a), a resin-based material packing 29 is used to maintain the sealing performance, and although water droplets can be prevented from entering the inside of the housing from the joint, the resin-based material packing is used. 29 is integrated with either a case (hereinafter referred to as A case 30) or a cover (hereinafter referred to as A cover 31), or a separate resin-based packing 29 is provided between the A case 30 and the A cover 31. Although there is a difference in the method of sandwiching between the two cases, after all, since the packing 29 of the resin material is a separate material, it is different from the A case 30 in each manufacturing process or assembly. The number of work steps to be sandwiched between the A cover 31 is required.
Further, in order to securely insert the resin-based material packing 29 into a predetermined position without twisting, biting, or damaging it, it is necessary to provide equipment with fineness, or to burden the operator. There was a case to be connected. This was an obstacle to overall cost reduction.

  Also, various structures are generally known for waterproof structures that do not use the resin-based material packing 29. For example, there is an electronic device housing with a simple waterproof structure that prevents water from entering the electronic device storage space by forming another wall inside the electronic device housing to form a double structure. Specifically, as shown in FIG. 7B, a waterproof structure that includes a case (hereinafter referred to as B case 32) and a cover (hereinafter referred to as B cover 33) that are joined together, and an electronic device is accommodated therein. The waterproof case is configured to have a double structure, and includes a discharge port 36 for discharging water that has entered from the joints provided on the inner wall 34 and the outer wall 35 provided on the outer periphery of the waterproof case to the outside. There are things. There exists what is shown by patent document 1 as an example of this kind.

  In the field of piping, a waterproof structure that does not use packing is proposed to prevent water leakage at the joint. In this waterproof structure, as shown in FIG. 7C, concentric concave grooves 37 are formed on one side of the opposing flat abutting surfaces of the pair of joints 40, and the other abutting surfaces are recessed. In the joint in which the annular convex portion 38 that can be fitted into the groove 37 is formed, the inner peripheral wall of the concave groove 37 on one side is formed as an inclined surface 39 from the bottom of the concave groove 37 to the inner surface of the inner peripheral wall. The inner wall of the convex portion 38 is formed as an inclined surface 39 so as to be thin toward the end portion of the annular convex portion 38, and the pair of joint portions 40 are fitted, as shown in FIG. In some cases, the entire periphery of the end of the inner peripheral wall of the groove 37 can be pressed against the inner peripheral wall of the annular convex portion 38 by fixing the outer periphery with a clamp 41. An example of this type is that of Patent Document 2.

JP-A-9-216648 (FIG. 2) Japanese Patent No. 4376114 (FIGS. 1 and 2)

However, in the waterproof structure that does not use the above packing, the inner wall has a double structure for the purpose of preventing water from entering the electronic device storage space, so the size of the waterproof case may become larger than necessary. There is a problem that the case and the cover part to be joined together are not formed unless they are resin molded products.
Also, in joint structures used for piping, etc., since the reaction force by applying external force from the outer periphery to the inside is used, when used for joining electronic equipment housings, There is a problem that the number of parts increases because parts such as a clamp for applying an external force from the outer periphery to the inside are necessary. Further, when the clamp is installed, there is a restriction that the casing itself is cylindrical.

  The present invention has been made in consideration of the above-described problems. Regardless of the material of the case and the cover to be integrally joined, even a resin molded product and a metal thin plate are small in size and can be easily joined by simply joining them. The object is to obtain a structure capable of preventing water from entering the housing.

An in-vehicle waterproof electronic device housing according to the present invention includes a resin case having a side wall provided with an opening surface for accommodating a printed circuit board, and a thin plate-like cover for closing the opening surface, and the periphery of the resin case opening surface. An inclined surface is provided at the end of the side wall protruding from the side to form an inclined portion where the tip side gradually becomes thinner toward the outside, and an inclined surface inclined toward the inside of the thin plate cover is formed on the closed surface of the thin plate cover. It provided an inclined portion is formed by, that each of the inclined portion presses and fixes to one another, the inclined surface of the inclined portion formed on the side wall tip end portion of the resin case opening surface is formed on the thin plate cover said been made to close contact along the inclined surface of the inclined portion, setting the hook portion to which the formed protruding in an L-shape to the side wall outer tip portion of the resin case extending along said side wall has Rutotomoni, are bent formed into an L-shape on the periphery of the thin plate cover the hook portion is provided which protrudes outside of the hook portion of the thin plate cover during assembly of the thin plate cover and the resin case It engages with the inside of the hook part of the resin case between the side wall and the hook part of the resin case.

According to the present invention, it is possible to realize waterproofing with a simple structure without using a sealing material for waterproofing regardless of the material of the case and cover to be joined together, thereby reducing the number of parts and man-hours. it can be. Furthermore, the burden on the operator can be reduced by simplifying the assembly, and the overall cost can be reduced. Then, an inclined surface is provided at the distal end portion of the side wall of the resin case to form an inclined portion where the distal end side becomes gradually thinner toward the outer side, and an inclined surface inclined toward the inner side of the thin plate cover is formed on the thin plate cover closing surface. Provided to form inclined portions and press and fix the inclined portions to each other, and the hook portion of the thin plate cover is attached to the hook portion provided on the side wall of the resin case when the resin case and the thin plate cover are assembled. By engaging, it can smoothly engage while restricting the bending of the side wall of the resin case, and the tip of the side wall of the resin case and the inclined portion of the thin plate cover can be reliably brought into close contact with each other.

1 is an exploded perspective view showing a waterproof electronic device casing for in-vehicle use according to a first embodiment of the present invention. FIG. 2A is a cross-sectional view showing the structure of the first embodiment of the present invention, FIG. 2A is a view showing the entire side cross section, and FIG. FIG. It is a figure explaining the pressing force applied to the resin case 10 when the side wall tip inclined surface of the resin case and the inclined surface of the thin plate cover are pressed. 4A and 4B are cross-sectional views showing the structures of Embodiments 2 and 3 of the present invention, where FIG. 4A is a cross-sectional view of an essential part thereof, and FIG. FIG. 4C is a partial sectional view showing a state in which the resin case and the thin plate cover are engaged. It is a figure explaining the inward force added to a resin case opening part, when a resin case and a thin-plate-shaped cover engage. FIGS. 6A and 6B are cross-sectional views showing the structure of Embodiment 4 of the present invention, and FIG. 6B is a partial cross-sectional view showing a state where a resin case and a thin plate cover are engaged. It is. FIG. 7A and FIG. 7B are diagrams showing a waterproof structure between a case and a cover, and FIG. 7C and FIG. d) is a view showing a joint structure of piping.

Embodiment 1 FIG.
FIG. 1 shows Embodiment 1 of the present invention. A part of the antenna member, a part of the connector member, and the conductive elastic member are shown through. Further, the metal thin plate-like cover member is shown through the elastic contact member.
As shown in FIG. 1, the in-vehicle waterproof electronic device housing 1 of the present invention has a metal antenna 3 mounted on a printed circuit board 2. On the printed circuit board 2, a wireless IC 4 having a wireless circuit, and a connector 18 connected to the wireless IC 4 via a pattern and connected to the external device 20 via a wire harness 19 are mounted.
Also, a power supply pattern 5 having one end connected to the wireless IC 4 is provided on the printed circuit board 2, and one end of the metal antenna 3 and one end of the pattern antenna 6 provided on the printed circuit board 2 are connected to the power supply pattern 5. A dipole antenna is formed by branching the metal antenna 3 and the pattern antenna 6 from 5. A matching circuit 7 is provided in the middle of the power feeding pattern 5.

  The printed circuit board 2 is housed in a resin case 10 formed of a synthetic resin made of a dielectric and having a side wall 12 serving as a side wall of the case, and is covered with a thin metal plate cover 11 formed of a conductive thin metal plate member. The thin metal plate cover 11 closes the resin case 10 and has a mounting structure for a vehicle, and is screwed to the vehicle. The ground pattern 8 of the printed circuit board 2 is electrically connected to the metal thin plate cover 11 via the conductive elastic body 9.

Further, as shown in FIGS. 2A and 2B, the upper surface side of the resin case 10 is gradually thinned at the front end portion of the side wall 12 formed on the side wall 12 and protruding from the peripheral edge of the opening surface. An inclined surface 13 is provided, and an inclined surface 14 that descends toward the inside of the cover is provided on the closing surface of the thin metal plate cover 11.
The resin case 10 and the metal thin plate cover 11 are joined in a direction orthogonal to the case opening, whereby the side wall tip inclined surface 13 of the resin case 10 and the inclined surface 14 of the metal thin plate cover 11 are pressed.
The pressing force A applied to the resin case 10 at this time is dispersed into a force B parallel to the inclined surface 13 and a force C perpendicular to the inclined surface 13 by the side wall tip inclined surface 13 of the resin case 10 as shown in FIG. The With the reaction force obtained from the resin case 10 by the force C perpendicular to the dispersed inclined surface 13, the inclined surface 13 of the resin case 10 and the inclined surface 14 of the metal thin plate cover 11 are brought into close contact with each other to obtain a waterproof effect. .

Embodiment 2. FIG.
Further, in order to obtain a waterproof effect, as shown in FIGS. 4A and 4B, the opening side wall tip portion formed on the side wall 12 of the resin case 10 is sufficiently deformed by the fitting force by assembly. It is preferable to provide minute ribs 15 to such an extent that they can be used. When the resin case 10 and the metal thin plate cover 11 are assembled, the minute ribs 15 are deformed by fitting the minute ribs 15 in contact with the metal thin plate cover 11 as shown in FIG. The adhesion between the resin case 10 and the metal thin plate cover 11 can be enhanced.
4C shows an example in which the minute ribs 15 are fitted to the grooves formed in the metal thin plate cover 11, but the minute ribs 15 are not formed in the metal thin plate cover 11 and formed. The necessary waterproof effect can be obtained just by touching.

Embodiment 3 FIG.
In addition, if the side wall 12 of the resin case 10 bends inward during the assembly operation for joining the inclined surface 13 of the resin case 10 and the inclined surface 14 of the thin metal plate cover 11, the resin case 10 and the thin metal plate Since the fitting with the cover 11 is not achieved, and as a result, the waterproof property is impaired, the side wall 12 of the resin case 10 in the assembling operation needs to be structured so as not to be deformed inward.
For example, as shown in FIG. 5, a protrusion 21 is provided on the upper outer side of the side wall 12 of the resin case 10, and a hook portion 22 having an engagement through hole 24 is provided on the peripheral edge of the thin metal plate cover 11. When the hook portion 22 of the thin metal plate cover 11 has a structure to be joined by getting over the protruding portion 21 on the side surface of the resin case 10, the tip end portion of the case side wall 12 is pushed inward as indicated by the arrow Y, The inclined surface 13 of the resin case 10 and the inclined surface 14 of the thin metal plate cover 11 cannot be joined well, resulting in a loss of waterproofness.

In order to avoid such a situation, in the present invention, as shown in FIG. 4A, a snap fitting hook portion 23 protruding in an L shape is provided on the outside of the side wall 12 of the resin case 10, and a metal thin plate shape is provided. A hook portion 22 is provided by partially protruding the periphery of the cover 11 and bending it in an L shape. The hook portion 22 is formed with a lock portion 24 having a through hole, and a snap fit mechanism is used to connect the inside of the snap fitting hook portion 23 of the resin case 10 and the outside of the lock portion 24 of the metal thin plate cover 11. It is structured to fit.
The force relationship at that time is “the strength of the snap fitting hook portion 23 of the resin case 10 <the strength of the lock portion 24 of the thin metal plate cover 11”, and the snap fitting hook portion 23 of the resin case 10 is outside during the fitting operation. It is set to fit while bending to the right. By setting in this way, the side wall tip inclined surface portion of the resin case 10 can be smoothly fitted without bending inward.

Embodiment 4 FIG.
The bonding structure between the resin case 10 and the metal thin plate cover 11 is considered other than the third embodiment, and corresponds to the through hole provided in the metal thin plate cover 11 as shown in FIG. It is also possible to use a method in which a melted portion protruding from the resin case 10 is formed, and the melted portion 25 provided in the resin case 10 is melted and joined by heat caulking or heat welding. FIG. 6B shows a state where the melted portion 25 is melted and both are joined.

Example 1.
As for the thin metal plate cover 11, an electrogalvanized steel sheet can be suitably used in that it has good conductivity, corrosion resistance, and ironing workability, and is mechanically strong and versatile.

  In the electrogalvanized steel sheet, it is effective to use a plate thickness of 1.0 mm from the viewpoint of workability of the joint inclined portion and the mechanical strength necessary for vehicle assembly, but depending on the unit size, 0.8 mm, or It may be effective to use 1.2 mm.

  Depending on the layout position of the unit, it may be more effective on the machining surface to combine a plurality of electrogalvanized steel sheets having the same thickness or different thicknesses by welding. In the present embodiment, the metal and the resin have been described, but it is obvious that the same effect can be obtained even if the resins are used.

  The in-vehicle waterproof electronic device casing configured as described above has high high frequency characteristics by bringing the opening inclined surface 13 of the resin case 10 and the inclined surface 14 of the thin metal plate cover 11 into close contact with each other by pressing. On the other hand, it is possible to improve the drip-proof property and reduce the number of parts and improve the assembling property at the same time without requiring a waterproof sealing material.

  In the present invention, within the scope of the invention, a part or all of each embodiment can be freely combined, or each embodiment can be appropriately modified or omitted.

  DESCRIPTION OF SYMBOLS 1 Vehicle-mounted waterproof electronic equipment housing, 2 Printed circuit board, 3 Antenna, 4 Wireless IC, 5 Feeding pattern, 6 pattern antenna, 7 Matching circuit, 8 Ground pattern, 9 Conductive elastic body, 10 Resin case, 11 Metal thin plate Cover, 12 side wall, 13 inclined surface (case side), 14 inclined surface (cover side), 15 minute rib, 18 connector part, 19 wire harness, 20 external device, 21 protrusion, 22 hook part, 23 snap fitting Hook part, 24 lock part, 25 melting part, A pressing force applied to case 10, B force parallel to inclined surface 13, C force perpendicular to inclined surface 13, Y inward pressing force.

Claims (8)

A resin case having an opening surface for accommodating a printed board and having a side wall; and a thin plate-like cover for closing the opening surface; and an outer surface provided with an inclined surface at the front end portion of the side wall protruding from the periphery of the resin case opening surface the tip side is formed gradually thinner inclined section toward the, above the thin plate cover closing surface forms an inclined portion provided with a sloping surface inclined towards the inside of the thin plate cover, each of the inclined portion By pressing and fixing each other, the inclined surface of the inclined portion formed at the end of the side wall of the resin case opening surface is in close contact with the inclined surface of the inclined portion formed on the thin plate cover. And a hook portion is provided on the outer side of the side wall of the resin case so as to protrude in an L shape, and a tip portion extends along the side wall. A hook protruding are bent formed into shape provided outside of the hook portion of the thin plate cover during assembly of the thin plate cover and the resin case with the hook portion of the resin case and the side wall automotive waterproof electronics enclosure, which comprises inner and engagement of the hook portion of the resin case between.   A minute rib is provided at the tip of the side wall of the opening surface of the resin case, and when the resin case and the thin plate cover are assembled, the minute rib is fitted in contact with the thin plate cover. The in-vehicle waterproof electronic device according to claim 1, wherein the minute rib is deformed to fill a minute gap between the resin case and the thin plate-like cover contact portion, thereby improving adhesion between the two intimate contact portions. Enclosure.   The tip of the hook portion formed on the peripheral edge of the thin plate cover gets over the protrusion formed on the inside of the hook portion provided outside the resin case, whereby the resin case and the thin plate cover are engaged. The in-vehicle waterproof electronic device housing according to claim 1 or 2, wherein the case is configured so as to match.   The in-vehicle waterproof type electronic device according to any one of claims 1 to 3, wherein the hook portion of the resin case is configured to be more easily deformed than a bent portion of a peripheral edge of the thin plate cover. Equipment housing.   The in-vehicle waterproof electronic device casing according to any one of claims 1 to 4, wherein the thin plate cover is made of metal. The in-vehicle waterproof electronic device housing according to claim 5, wherein the thin plate cover is an electrogalvanized steel plate. The in-vehicle waterproof electronic device housing according to claim 6, wherein the thin plate cover has a thickness of 0.8 mm to 1.2 mm.   The in-vehicle waterproof electronic device housing according to any one of claims 1 to 4, wherein the thin plate cover is made of resin.

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