JP2504546Y2 - High frequency shield case - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-frequency shield case, such as a CATV high-frequency shield case used for a television signal distributor, a branching device or the like, which ensures a high shielding effect with a simple structure. Further, it is intended to provide a mechanism having excellent waterproof property.

[0002]

2. Description of the Related Art A case used as a distributor or branching device for a television signal is required to have a high-frequency shielding property for preventing signal leakage or mixture, and it has been generally adopted so far in order to immediately meet such a requirement. What has been described is one in which a plate-like lid made of rolled material is screwed to the opening of a metallic case such as a cast body.

Since the conventional general type as described above has a disadvantage that the plate-like lid floats between the screwed portions, the conductive elastic resin layer is formed on the surface in the practical use 59-3581 (actual fair 3-4073). The metal plate on which is formed is drawn to form a bent portion that makes surface contact with elasticity around each other around the periphery, and the lid body is adhered to the opening of the case body directly or through the conductive elastic resin layer. It is proposed to mate.

On the other hand, in Japanese Utility Model Laid-Open No. 60-153594, a case main body having an open end, a lid fitted to the open end of the case main body, and a case body sandwiched between the open ends of the case main body. A shield case made of a mesh material has been proposed, and as one form of the shield case, it has been announced that a groove portion formed in an opening end face is overlapped with a bent portion at the peripheral edge of the mesh and fitted.

Further, in Japanese Patent Laid-Open No. 3-64996, a metal wire is used as a shield mesh as described above, and a wire material such as a heat-welding fiber which is melted and solidified by being subjected to a predetermined treatment to exhibit adhesiveness. A knitted or woven mesh tape has been announced to prevent fraying at the time of cutting and scattering of metal wire scraps generated at the time of cutting. Moreover, the same technique can be found in Japanese Utility Model Application No. 145199/1985.
It was also announced in Microfilm No. 3-41800, and its braided materials or gaskets, elastomer cores, metal webs, fingers, etc.
Various announcements have been made in "The latest technology for noise suppression" issued by Sogo Gijutsu Gijutsu.

Further, in Japanese Utility Model Laid-Open No. 2-75799, a holding step portion is formed inside a lid body formed by a plurality of first and second wire rods braided so as to cross each other and on an inner circumference of a case body. And a shield mesh sandwiched between the shield mesh and the first and second cutting directions of the shield mesh peripheral edge portion.
It has been proposed to make the direction intersecting with any of the extending directions of the wire.

In Japanese Patent Laid-Open No. 3-72697, the wavelength of the signal frequency handled by the device is provided on the peripheral portion of the conductive cover provided on the peripheral portion of the opening of the case body, the peripheral portion corresponding to the case body mounting portion. However, it has been proposed to provide an uneven portion having a sufficiently small interval.

[0008]

[Problems to be Solved by the Invention] Conventionally, the actual plate-shaped lid has been proposed instead of simply screwing it.
In the case of 3581 (actual fair 3-4073), since the conductive elastic resin layer is formed on the plate-like lid, the resin layer may be cracked or the resin layer may change with time depending on the drawing depth. It is unavoidable that the shield becomes unstable due to deterioration.

Japanese Unexamined Patent Publication No. 3-64996 and Japanese Utility Model Laid-Open No. 1-145
According to 199, a specially manufactured mesh tape or a conductive rubber strip is used, and further, the mesh tape or the conductive rubber strip is cut into a predetermined length, and the work of joining both ends thereof is expensive. It has to be something.

Japanese Utility Model Laid-Open No. 2-75799 and Japanese Patent Laid-Open No. 3-726.
In No. 97, the opening is pushed open by press fitting, and since the plate-like lid is a thin plate, partial floating occurs between the corners, and the close contact state cannot be secured.

In the case of the actual open sho 60-153594, a separately prepared mesh material is required, and even when the lid and the bent portion of the mesh material peripheral edge are fitted in the groove formed on the opening end face, The contact with the lid and the mesh material is incomplete, and the shielding property is not always sufficient.

[0012]

[Means for Solving the Problems] The present invention has been studied repeatedly for solving the technical problems in the above-mentioned conventional ones, and utilizes a composite pinching shield portion by wedge-type press-fitting into a groove portion. It has succeeded in forming an accurate high-frequency shield relationship by utilizing a contact shield part having different contact surface directions between the upper edge and the inner surface of the lid, and is as follows.

(1) A metal case body having an opening formed therein, in which an electric circuit section is set and accommodated,
In a case including a metal lid that closes the opening of the case body, the cross section is symmetrically tapered around the entire periphery of the opening of the case body, and the depth is three times or more the thickness of the lid. And a bent portion fitted to the above-mentioned concave groove is formed on the entire circumference of the lid body at least twice the thickness of the lid body. By press-fitting into the bent portion, the pinching contact portions are formed symmetrically between the inner and outer surfaces of the tip portion and both side wall surfaces of the concave groove, respectively, and there is a pressure contact portion between the inner surface of the lid and the top edge of the opening. A high-frequency shield case characterized by being formed.

(2) In a case comprising a metal case body for setting and accommodating an electric circuit section inside and a metal lid for closing the opening of the case body, the case body has an opening on one side or both sides. Is formed as a frame-shaped body made of a plate material having a thickness of 3, and the lid body is formed of a thicker member than the case body, and has a symmetrical taper cross section along the entire periphery thereof and a depth of 3 times the case body thickness. A groove having a size equal to or more than double is provided annularly, and the inner edge of the opening and the wall surfaces on both sides of the groove are formed by press-fitting the edge of the opening of the case body, which is the frame-shaped body, into the groove. A high-frequency shield case characterized in that sandwiching contact portions are formed symmetrically between them.

(3) A first case body or a lid body made of metal, in which a groove having a tapered cross section is provided around the entire circumference.
A second part which is formed by a second part body which is also a metallic lid or case body in which a part body and an end edge part which is fitted in the groove are formed, and which is fitted in the groove as described above. The high-frequency shield case according to any one of the above items (1) and (2), wherein an adhesive layer is provided on the inner surface of the body at least in the concave groove fitting portion.

[0016]

[Operation] An opening is formed and an electric circuit is set inside.
In a case composed of a metal case main body adapted to be housed and a metal lid for closing the opening of the case main body, the cross section is symmetrically tapered along the entire periphery of the opening of the case main body and has a depth. A concave groove having a thickness not less than three times the thickness of the lid is annularly provided, and a bent portion fitted in the concave groove is provided at the entire circumference of the lid not less than twice the thickness of the lid. By forming it, it is possible to obtain appropriate elasticity in the groove and the bent portion.
The bending portion is press-fitted into the concave groove, and the symmetrically balanced clamping pressure is applied to both sides of the front end side of the bending portion in the inner portion of the concave groove so as to form an elastically and effectively continuous clamping pressure contact portion. The lids are formed at both the inner and outer portions, and the lids are prevented from being pulled out and floated by the balanced clamping pressure as described above. More preferably, since the clamping force in the groove has a counteracting and balanced acting force as described above, it is formed without forming a deformation or a floating state in the intermediate portion or the like of either the case or the lid. The mating and joint splicing state on both sides accompanying it are kept stable.

Since the pressure contact portion can be formed between the inner surface of the lid and the top edge of the opening portion as described above, the shield portion can be formed in triple layers, and the high frequency shield is completed completely. To do.

In a case composed of a metal case body for setting and housing an electric circuit section inside and a metal lid for closing the opening of the case body, the case body has an opening on one side or both sides. The case body is formed as a frame-shaped body made of a plate material, and the lid body is formed of a thicker member than the case body in which a concave groove having a tapered cross section is provided around the entire periphery of the lid body. In addition to being mass-produced, it is lightweight and low-cost, while the lid is also manufactured by a simple casting method using upper and lower molds, which improves the productivity of this type of high-frequency shield case.

The inner and outer surfaces of the opening and the wall surfaces on both sides of the groove are pressed by press-fitting the edge of the opening of the case body, which is the frame-shaped body, into the groove having the tapered cross section as described above. By forming symmetrical squeezing contact portions between them, exactly the same balanced squeezing force is applied to the inner and outer surfaces of the opening of the case body in the same manner as described above to prevent the lid body from being pulled out and to overlap the shield portion. Form.

A metal case body or a lid body in which a concave groove having a symmetrical tapered cross section is provided around the entire circumference of the case body.
The first body and the second body are stable by being formed by the second body which is a lid body or a case body also made of metal, in which the body body and the edge portion fitted in the groove are formed. And it is attached by the combined shield part.

Between the first part body and the second part body assembled as described above, at least the concave groove fitting part is formed on the inner surface of the second part body fitted in the concave groove as described above. By providing the double-sided adhesive material layer in (1), the assembling relationship between the first body and the second body can be further specified, and extraction and displacement can be more effectively prevented, and the shield can be perfected.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A concrete embodiment of the present invention as described above will be described with reference to the accompanying drawings. This type of high frequency shield case is used as a distributor and a branching device, and moreover, does not leak signals. It is necessary to prevent external contamination, and the first embodiment is shown in FIGS.
As shown in Fig. 2, the case body 1 and the lid body 2 are made of metal.
The case body 1 has an electric circuit board 3 and the like set therein, and is provided with an input terminal 15 and an output terminal 15.

In this embodiment according to the present invention, a groove 12 is formed on the entire peripheral edge of the opening 11 of the case body 1 as described above, and a bent portion on the circumferential side of the lid body 2 formed in a bowl shape by squeeze molding. 22 is accepted.

As shown more clearly in FIG. 4, the groove 12 has symmetrical wall surfaces 13 on both sides, so that the bent portion 2 of the lid body 2 is press-fitted into the groove 12.
Both sides of 2 are pinched so as to face each other in a wedge shape, and pinching contact portions 5 and 5 are continuously formed on both sides of such a tip end portion, and a balanced contact shield portion is secured. That is, since the tapered wall surface 13 is provided oppositely, the bent portion 22 can be easily press-fitted, and the bent portion 22 is pinched by a strong and concentrated crimping force, and the inner surface of the lid body 2 and the opening portion of the case body 1 are closed. Top edge 7
Since the pressure contact portion 6 is formed between the pressure contact portion 6 and the pressure contact portion 6, the shield property with respect to a high frequency is completely perfect.

As shown in FIG. 4, the both side walls of the groove portion 12 have a case body of the lid body 2 fitted in the groove portion 12 by lowering the inner surface side of the case body 1 and raising the outer surface side thereof. The amount of protrusion from the top edge of the main body 1 is made small, and in particular, about 1/2 of the thickness of the lid body 2 is immersed in the top edge of the outer wall of the groove portion 12, so that the lid body 2 is simply press-fitted. Even if only by itself, the lid 2 is prevented from slipping out in combination with the pinching action by the tapered surface as described above.

It is appropriate that the depth of the groove portion 12 is at least 3 times or more, preferably 5 to 7 times, the thickness of the lid body 2 which is a member to be inserted, and such a depth is also suitable. The length of the bent portion 22 pushed into the groove portion 12 is also the lid body 2.
It is as shown in FIG. 4 that the thickness is 2 times or more, preferably 3 to 5 times, and by doing so, the bent portion 22 and the groove portion 12 are properly blended, and the clamping force as described above is exerted. Or effectively secure the shield effect and form a stable set relationship.

A second embodiment according to the present invention is shown in FIGS. 5 and 6. That is, the ones shown in FIGS.
In contrast to the case body 1 made of a thick cast body or the like, the case body 1 shown in FIGS. 5 and 6 is produced by drawing the case body 1a as a plate, and the electric circuit board 3 is attached to the body. On the other hand, the lid body 2a is obtained as a cast body or the like which is thicker than the case body 1a, and a groove portion 24 having a tapered surface 23 provided oppositely is formed on the entire periphery of the lid body 2a.

That is, in the case of the one shown in FIGS. 5 and 6, the case body 1a can be easily formed as a relatively thin layer and a light weight body by drawing the rolled plate material, while the lid body is made up and down. It can be easily manufactured as a cast body between mold materials, and the tapered surface 2
It is possible to effectively form the pinching joining relationship between the three, just as in the case of FIGS. 1 to 4, and the lid body 2 is effectively locked to the case 1 at both tapered surfaces 23 and 23.

Further, FIG. 7 shows a case where the lid body 2a is used so as to face the case body 1b in the shape of a frame, which is opposed to the upper and lower sides of the case body 1b.
The respective lids 2a are the same as those shown in FIGS. 5 and 6, and the case body 1b can be easily manufactured as a ring-shaped or short-cylindrical frame body. The lid body 2a is attached from above and below in exactly the same manner as in the case of FIGS. 5 and 6, and a favorable shield relationship is stably formed between the case body 1b and each of the lid bodies 2a.

Further, in FIG. 8, a lid body fitted with a groove portion 12 having a tapered surface in a case body 1 and a lid body 2 having the same structure as those in FIGS. 1 to 4 described above. 8 shows the case where the adhesive layer 4 is formed on both surfaces of the inner surface of the groove 2 in at least the inner fitting portion of the groove 12 in FIG. The taper surface 13a has a composite adhesive effect, which provides high adhesiveness and more stable shield bonding, ensures high shieldability, and in particular provides sufficient watertightness to complete a waterproof structure. You can

As shown in FIG. 8, the above-mentioned adhesive layer 4 is also formed on the inner surface of the lid 2 joined to the top edge surface 7 of the opening of the case body 1 so that the shield and the watertightness can be provided also in this portion. The seal is completed, and the effects described above are further improved. The one shown in FIG. 8 is typically shown in FIGS.
The same adhesive layer 4 is shown in FIGS.
It is needless to say that it may be appropriately adopted also in the case of FIG.

In the case of the waterproof type as described above, it is a matter of course that a waterproof connector is used for connecting the respective plug portions, and in each of the other cases, it can be appropriately changed and implemented.

[0033]

According to the present invention as described above, at least a composite shield part is formed, and a favorable elastic pinching action condition balanced and a partial deformation or levitation state of the part body is achieved. It is possible to form and maintain an accurate shield joint without forming it, and yet to secure the target shield without the need for special and expensive shield members, mounting screws and other parts and processing therefor. It also has the effect of eliminating the need for such things, and is a device that has a great effect industrially.

[Brief description of drawings]

FIG. 1 is a partially cutaway plan view showing an embodiment of the present invention.

FIG. 2 is a transverse side view thereof.

FIG. 3 is a vertical sectional side view thereof.

FIG. 4 is an enlarged cross-sectional view of a part thereof.

FIG. 5 is a vertical side view of another embodiment of the present invention.

FIG. 6 is an enlarged sectional view of a part thereof.

FIG. 7 is a vertical sectional side view showing still another embodiment according to the present invention.

FIG. 8 is a partially enlarged cross-sectional view of the one shown in FIGS. 1 to 4 in which an adhesive layer is further formed.

[Explanation of symbols]

 1 Case Main Body 1a Case Main Body 2 Lid 2a Lid 3 Electric Circuit Board 4 Adhesive Layer 5 Clamping Contact 6 Pressure Contact 7 Opening Top Edge Surface 11 Opening 12 Groove 13 Both Side Tapered Walls 15 Input / Output Terminal 22 Fold Curved part 23 Tapered surface 24 Groove part

Claims (3)

(57) [Scope of utility model registration request] 1. A case comprising a metal case body having an opening formed therein, in which an electric circuit section is set and housed, and a metal lid body closing the opening of the case body. A concave groove having a symmetrical taper cross-section and having a depth not less than 3 times the thickness of the lid is provided around the entire circumference of the opening of the case body. The bent portion to be fitted in is formed to have a thickness twice or more the thickness of the lid,
By press-fitting the bent portion into the concave groove, pinching contact portions are formed symmetrically between the inner and outer surfaces of the tip portion of the bent portion and the wall surfaces on both sides of the concave groove, and the inner surface of the lid and the top of the opening portion. A high-frequency shield case characterized in that a pressure contact portion can be formed between the edge and the edge. 2. A case comprising a metal case body for setting and accommodating an electric circuit section inside and a metal lid for closing an opening of the case body, wherein the case body has an opening on one side or both sides. It is formed as a frame-shaped body made of a plate material, the lid body is formed of a thicker member than the case body, and the cross section is symmetrically tapered all around the periphery, and the depth is three times the thickness of the case body. Between the inner and outer surfaces of the opening and both side wall surfaces of the groove by press-fitting the edge of the opening of the case body, which is the frame-shaped body, as described above by annularly forming the groove. A high-frequency shield case characterized in that the pinching contact portions are formed symmetrically on each side. 3. A first part body, which is a metal case main body or a lid body, in which a concave groove having a tapered cross section is provided around the entire circumference, and an edge portion fitted in the concave groove is formed. An adhesive layer is provided on the inner surface of the second part, which is formed by the second part that is a metal lid or case body and is fitted into the groove as described above, at least in the groove fitting part. The high-frequency shield case according to claim 1, wherein the shield case is for high frequencies.