JP2011071362A - Metal casing for communication device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent rust near a waterproof packing in a waterproof structure where anti-rust coating is not applied to the sections abutting the conductive waterproof packing, to effectively prevent penetration and leakage of electromagnetic wave in the waterproof structure of the abutment surfaces of a casing body and a lid in a metal casing for a communication device placed outdoors. <P>SOLUTION: A metal casing body for a communication device includes a peripheral groove 26 provided on at least either of the abutment surfaces 20, 30 of a casing body 2 and a lid 3 in a manner surrounding an opening of the casing body 2, and a waterproof packing 4 fitted in the peripheral groove to cause the waterproof packing 4 to be pressed and held between the casing body 2 and the lid 3. In the metal casing, at least either the casing body 2 or the lid 3 has a recess 25 which is formed in a position outside of the peripheral groove 26 and serves to shut off a water moving path generated by a capillary phenomenon between the abutment surfaces 20, 30 of the casing body 2 and the lid 3. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a metal casing for communication equipment installed mainly outdoors, and relates to a metal casing characterized by a waterproof structure.

Conventionally, a metal casing, which is an outer shell of a wireless communication device installed outdoors, such as a communication base station of a mobile terminal such as a mobile phone, floods electronic components and electronic circuits on a wiring board housed inside. Waterproof structure to protect from.
7 and 8 show an example of the waterproof structure (Patent Document 1).
The metal casing (1) consists of a casing main body (2) and a lid (3), both of which have flanges (21) and (31) all around each other, and the flanges (21) and (31) are connected to each other. It is fastened and fixed by screws (5).
周 Double circumferential grooves (26) and (28) are opened in the flange (21) of the main body (2), waterproof packing (4) in the outer circumferential groove (26), and ring shape in the inner circumferential groove (28) The water-absorbing material (6) is attached.
By tightening both flanges (21) and (31), the waterproof packing (4) and the water absorbing material (6) are elastically deformed to prevent water from entering due to the contact pressure of the waterproof packing (4). Water that has passed through the waterproof packing (4) without being able to prevent intrusion is absorbed by the water absorbing material (6) to prevent water from entering the housing (1).

Although not disclosed in Patent Document 1, a rustproof coating is applied to a housing for a communication device installed outdoors.
However, the metal body (1) is electrically connected to the lid body (2) and the lid (3) in order to enhance the effect of preventing external electromagnetic waves from entering the cage and leaking electromagnetic waves from the inside of the cage to the outside. The rust-proof coating is not applied to the contact surfaces of the two. The waterproof packing (4) itself is also of a conductive type.

JP 2001-326475 A

Moisture, such as rainwater, may enter the gap between the flange body (2) and the flange (21) (31) of the lid (3) by capillarity and reach the waterproof packing (4). The waterproof packing (4) is housed in the circumferential groove (26) so that water can easily collect. As described above, the portions of the flanges (21) and (31) that are in contact with the waterproof packing (4) are rust-proofed. In the vicinity of the waterproof packing (4), the flanges (21) and (31) are rusted in a short period of time, resulting in a decrease in waterproof performance and water intrusion into the housing (1), causing a major problem. There is a fear.
Further, in order to screw the flanges (21) and (31), the overhanging length of the flanges (21) and (31) must be increased, resulting in an increase in the weight of the housing (1).
Since the water absorbing material (6) of Patent Document 1 is disposed on the inner side of the waterproof packing (4), water enters the waterproof packing (4) from the outside due to capillary action into the water absorbing material (6). There is no role to prevent this. That is, the water absorbing material (6) does not contribute to the rust prevention in the vicinity of the waterproof packing (4).
The present invention clarifies a metal casing for a communication device that prevents rust in the vicinity of a waterproof packing without deteriorating electromagnetic wave intrusion and leakage performance.

Claim 1 consists of a heel body (2) and a lid (3) that closes the opening (27) of the heel body, and the contact surfaces (20) (30) of the heel body (2) and the lid (3). ) Is provided with a circumferential groove (26) around the opening (27) of the heel body (2) on at least one of the surfaces, and a waterproof packing (4) is fitted into the circumferential groove. In a metal housing of a communication device in which a waterproof packing (4) is clamped by a lid (3),
A recess (25) is formed on the outer side of the circumferential groove (26) on at least one of the contact surfaces (20) and (30) of the lid body (2) and the lid (3). ing.

  Claim 2 is a metal casing for communication equipment according to claim 1, wherein the waterproof packing (4) is electrically conductive, and the contact portions of the casing (2) and the lid (3) with the waterproof packing (4) are also provided. Conductivity is maintained.

  According to a third aspect of the present invention, in the metal case for the communication device according to the first or second aspect, the main body (2) and the lid (3) are provided with flanges (21) and (31), and the flanges are in contact with each other. The projecting pieces (22) and (32) which are in contact with each other and partially extend outward from the flanges (21) and (31) are fixed by tightening the screws (5).

  Claim 4 is a metal casing for communication equipment according to claim 3, wherein a recess (25) is provided between the screw (5) and the waterproof packing (4). .

  According to a fifth aspect of the present invention, in the metal casing for the communication device according to the third or fourth aspect, the recess (25) is provided on the protrusion (22) of the main body (2) and / or the protrusion (22) of the lid (3). ) On the inner side of the screw (5) and both ends of the recess (25) are open to the outside of the projecting piece.

  The metal casing for the communication device of the present invention has a capillary phenomenon due to the recess (25) even if water enters between the contact surfaces (20) and (30) of the casing (2) and the lid (3). Since the water transfer path is interrupted, it is possible to prevent water from moving further to the waterproof packing (4) side. For this reason, even if rust preventive coating is omitted on the contact surfaces (20) and (30) of the bag body (2) and the lid (3) where the waterproof packing (4) is contacted, It is possible to suppress a decrease in the waterproofing effect due to.

It is sectional drawing of the metal housing for communication apparatuses. It is a disassembled perspective view of the metal housing for communication apparatuses. It is a perspective view of the waterproof structure (the main body side and the lid river) of the first embodiment. It is sectional drawing of a waterproof structure assembly same as the above. It is a perspective view of the waterproof structure (the bag main body side) of 2nd Example. It is a perspective view of the waterproof structure of the third embodiment (the bag body side). FIG. 10 is a perspective view of a metal casing waterproof structure for a communication device according to a conventional example (the main body side and the lid river). It is sectional drawing of a waterproof structure assembly same as the above.

[First Embodiment (FIGS. 1 to 4)]
A metal casing (1) for communication equipment includes a substantially rectangular parallelepiped main body (2) and a lid (3) having an opening (27) on one surface.
Flange (21) (31) protrudes from the opening edge of the main body (2) and the outer periphery of the lid (3), and the flanges (21) and (31) come into contact with each other, and the main body (2) Close the opening (27).

A circumferential groove (26) is formed around the opening (27) on the contact surface (20) of the flange (21) of the flange (21) of the main body (2), and the circumferential groove (26) has O A waterproof packing (4) such as a ring protrudes from the circumferential groove (26) and is fitted.
The waterproof packing (4) has conductivity.

Protruding pieces (22) and (32) project from the opposing positions in the vicinity of the four corners of the flanges (21) and (31).
The projecting piece (22) on the flange (21) of the main body (2) protrudes lower than the contact surface (20) of the flange (21), and is spaced from the flange (21). The boss (24) protrudes, and the end surface of the boss (24) coincides with the height of the contact surface (20) of the flange (21).
A screw hole (23) is opened through the boss (24) through the protruding piece (22).

The projecting piece (32) on the flange (31) of the lid (3) is aligned with the contact surface (30) of the flange (31) with respect to the mating flange (21).
In the projecting piece (32), a screw insertion hole (33) is provided at a position corresponding to the screw hole (23) of the projecting piece (22) on the side of the collar body (2).

  The heel body (2) and lid (3) are rust-proofed, but the part that comes into contact with the waterproof packing (4), specifically, the circumference of the flange (21) of the heel body (2) The inner surface of the groove (26) and the portion of the lid (3) facing the circumferential groove (26) are not coated with rust-proof coating, and the conductive waterproof packing (4) is directly attached to the main body (2) and the lid. It comes in contact with the metal surface of (3).

  Cover the main body (2) with the lid (3), insert the screw (5) through the hole (33) on the lid (3) side, screw it onto the boss (24) on the main body (2) side, and tighten it.防水 The waterproof packing (4) is elastically deformed by the flanges (21) and (31) of the main body (2) and the lid (3), and waterproofing is achieved by the contact pressure of the waterproof packing (4) on both flanges (21) and (31). .

Even if the contact surfaces (20) and (30) of the flanges (21) and (31) are brought into close contact with each other by tightening the screws (5), a fine gap is generated between the contact surfaces (20) and (30) due to capillary action. It cannot be excluded that water intrusion occurs.
The capillary phenomenon appears prominently in the vicinity of the tightening portion, that is, in the vicinity of the screw (5).
However, the space between the flange (21) of the rod body (2) and the boss (24) on the protruding piece (22) protruding from the flange (21), that is, the contact surface (20 of the flange (21)) ), The recess (25) plays a role of interrupting the water transfer path by capillary action between the screw (5) and the waterproof packing (4).

  However, even if water enters the outside of the housing (1) due to the capillary phenomenon between the contact surfaces (20) and (30) of the body (2) and the lid (3), the capillaries are formed by the recess (25). Since the transition path of water due to the phenomenon is interrupted, it is possible to prevent water from moving further toward the waterproof packing (4) in the recess (25). For this reason, even if rust preventive coating is omitted on the contact surfaces (20) and (30) of the bag body (2) and the lid (3) where the waterproof packing (4) is contacted, It is possible to suppress a decrease in the waterproofing effect due to.

Since the flange body (2) and the lid (3) are provided with flanges (21) and (31), both flanges (21) ( 31), it is possible to secure a necessary contact area between the bag main body (2) and the lid (3) and to provide a peripheral groove (26) for the waterproof packing (4).
Since both the flanges (21) and (31) are tightened by screwing the projecting pieces (22) and (32) partially extending outward from both flanges (21) and (31), the flanges ( 21) The overhang length of (31) allows the opening of the circumferential groove (26) for the waterproof packing (4) and the minimum required contact area between the main body (2) and the lid (3). Therefore, the metal casing (1) can be reduced in weight.

  The capillarity occurring on the contact surfaces (20) and (30) of the flanges (21) and (31) of the heel body (2) and the lid (3) appears more prominently at locations where the tightening force is strong against both flanges. That is, the capillary phenomenon appears prominently in the vicinity of the screw tightening portions of both flanges (21) and (31). However, a recess (25) is provided between the screw fastening portion and the waterproof packing (4) to provide water due to the capillary phenomenon. Since the transition transition path is blocked, the movement of water to the waterproof packing (4) can be effectively prevented.

筺 When the recessed part (25) is provided on the projecting piece (22) of the main body (2), the flange (21) (31) of the flange (21) (31) is compared with the case where the recessed part (25) is provided on the flange (21) (31). The overhang length can be shortened.
Since both ends of the recess (25) are open to the outside of the flanges (21) and (31), drainage can be effectively performed through the recess (25).

[Second Embodiment (FIG. 5)]
The second embodiment is basically the same as the first embodiment, except that the projecting piece (22) protruding from the flange (21) of the bag main body (2) is a contact surface (20) of the flange (21). The first embodiment is that a groove-like recess (25) is provided between the screw hole (23) on the projecting piece (22) and the waterproof packing (4). And different.
More simply, the difference between the two is that the recess (25) of the first embodiment is opened substantially parallel to the waterproof packing (4) of the second embodiment, whereas both ends open outward. The groove-like recess (25) is that both ends are closed.
In the same way as in the first embodiment, the second embodiment also has a recess (25), and the transition path of water by capillary action generated between the contact surfaces (20) and (30) of the flanges (21) and (31). Can be interrupted.

[Third embodiment (FIG. 6)]
In the third embodiment, the overhanging length of the flange (21) of the bag body (2) is increased, and the circumferential groove (26) is made to go around the outer side of the circumferential groove (26) for the waterproof packing (4). An annular recess (25) is opened, and a screw hole (23) for fastening and fixing the lid (3) is opened outside the annular recess (25).
By opening the recess (25) annularly on the outside of the waterproof packing (4), the water transition path by capillary action generated between the contact surfaces (20) and (30) of the flanges (21) and (31) Since the entire circumference of the flange (21) is interrupted, it is possible to more effectively prevent water from the outside from reaching the waterproof packing (4).

  The above description is provided to illustrate the present invention and should not be construed as limiting the invention described in the claims or reducing the scope thereof. In addition, the configuration of each part of the present invention is not limited to the above embodiment, and various modifications can be made within the technical scope described in the claims.

For example, a circumferential groove (26) may be opened in the flange (31) of the lid (3), and the waterproof packing (4) may be attached to the circumferential groove (26).
It is also possible to provide a circumferential groove (26) in both the bag main body (2) and the lid (3), and to insert a waterproof packing (4) across both the circumferential grooves.

  Also, there is a recess (25) for interrupting the water transition path due to capillary action on the contact surfaces (20) and (30) of the flanges (21) and (31) of the lid body (2) and the lid (3). The same effect as described above can be obtained by opening the flange (31) of the lid (3) or both flanges (21) (31).

1 Body 2 Body
21 Flange
22 Projection
24 Boss
25 dent
26 Circumferential groove 3 Lid
31 Flange
32 Projection 4 Waterproof packing 5 Screw

Claims (5)

The heel body and a lid that closes the opening of the heel body. At least one of the contact surfaces of the heel body and the lid is provided with a circumferential groove around the opening of the heel body. In a metal casing of a communication device in which a waterproof packing is fitted in and the waterproof packing is sandwiched between the casing and the lid,
A metal casing for a communication device, wherein a recess is formed on at least one of the contact surfaces of the casing body and the lid at a position outside the circumferential groove.   The metal casing for a communication device according to claim 1, wherein the waterproof packing is conductive, and conductivity is also maintained in contact portions of the casing main body and the lid with the waterproof packing.   The flange body and the lid are provided with each other, the flanges are in contact with each other, and the projecting pieces partially extending outward from both flanges are fixed by tightening screws. A metal housing for the described communication device.   The metal casing for a communication device according to claim 3, wherein a recess is provided between the screw and the waterproof packing. 5. The communication according to claim 3, wherein the recessed portion is provided on the inner side of the screw on the protruding piece of the bag main body and / or the protruding piece of the lid, and both ends of the recessed portion are opened to the outside of the protruding piece. Metal enclosure for equipment.

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