JPH04130496U - High frequency shield case - Google Patents

Abstract

(57) [Summary] [Purpose] To ensure high shielding performance with a simple configuration,
It also provides a mechanism with excellent waterproof properties. [Structure] In a case consisting of a metal case body and a metal lid body, a groove with a symmetrically tapered cross section is provided around the entire circumference of the opening of the case body, and the groove is formed around the entire circumference of the lid body. A bent portion is press-fitted to form a symmetrical pinching contact portion. [Effect] Forms and maintains a stable and accurate high frequency shield simply by press-fitting the lid.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to a high frequency shield case, and is used for television signal distributors and branching devices. Simple configuration for CATV high frequency shield cases used in We are trying to ensure a higher shielding effect and provide a mechanism with excellent waterproofness. It is something that

0002

[Conventional technology]

When used as a television signal divider or splitter, there is a need to prevent signal leakage. High-frequency shielding properties are required to prevent contamination by radio waves, and we are responding immediately to these demands. What has been commonly adopted in the past is the opening of a metal case, such as a cast body. A plate-shaped lid made of rolled material is screwed to the mouth.

0003 Conventional conventional ones as mentioned above have the disadvantage that the plate-shaped lid floats between the screwed parts. Because there is A metal plate with a conductive elastic resin layer is drawn to make each other elastic around the entire periphery. This forms a bent part that makes surface contact so that the lid can be placed directly or directly on the opening of the case body. It has been proposed to closely fit them through a conductive elastic resin layer.

0004 On the other hand, in Utility Model Application No. 60-153594, a case body having an open end and a A lid that fits onto the open end of the case body, and a lid that is inserted between the open end of the case body and the lid. A shield case made of embedded mesh material has been proposed, and one form of it has been developed. The folded portion at the periphery of the lid and mesh is overlapped with the groove formed on the end surface of the mouth. It has been announced that they will be mated.

[0005] Furthermore, Japanese Patent Application Laid-Open No. 3-64996 discloses metal wax as a shielding mesh as described above. A hot melt that solidifies and exhibits adhesive properties after being melted and subjected to a specified treatment. A mesh tape knitted or woven with wire rods such as adhesive fibers was announced, and when cut, This is said to be intended to prevent fraying and scattering of metal wire scraps generated during cutting. Also, similar braided materials or gaskets, elastomer cores, metal webs, fingers - etc. in ``Latest Noise Countermeasure Technology'' published by Sogo Gijutsu Publishing on July 30, 1986. Various publications have been published.

[0006] In addition, in Utility Model Application Publication No. 2-75799, a plurality of braids intersecting each other are disclosed. A protective layer is formed on the inside of the lid formed of the first and second wire rods and on the inner periphery of the case body. A shielding mesh is sandwiched between the holding step and the peripheral edge of the shielding mesh is A direction that intersects the cutting direction with both of the directions in which the first and second wire rods extend. It is proposed that

[0007] In addition, in JP-A-3-72697, a The device is attached to the periphery of the conductive lid applied to the mounting part, which corresponds to the case body mounting part. Providing uneven portions with a spacing sufficiently small for the wavelength of the signal frequency handled by the has been proposed.

[0008]

[Problem that the idea aims to solve]

Utility Model 59, which was proposed in place of simply screwing the conventional plate-shaped lid. 3581 (Jikkoi 3-4073), the plate-like lid is made of conductive elastic resin. Because it forms a layer, cracks may occur in the resin layer depending on the drawing depth, or the resin layer may It is inevitable that the shield will become unstable due to deterioration due to changes over time.

[0009] The one according to JP-A-3-64996 uses a specially made mesh tape. , and also requires work to join both ends of the mesh tape, making it expensive. I have no choice but to.

0010 In JP-A-2-75799 and JP-A-3-72697, the opening is made by press-fitting. The parts may be pushed apart, or because the plate-like lid is thin, there may be partial damage between the corners. Lifting occurs and adhesion cannot be ensured.

[0011] Utility Model Application No. 60-153594 requires mesh material prepared separately, and When the lid and the bent part of the mesh material periphery are fitted into the groove formed on the opening end surface. However, the contact between the groove and the lid and mesh material is incomplete, resulting in poor shielding performance. is not necessarily sufficient.

0012

[Means to solve the problem]

This invention is about solving the technical problems of the conventional ones as mentioned above. After careful consideration, we decided to use a composite pressure shield that was wedge-type press-fitted into the groove. In addition, a contact shield part with a different contact surface direction between the upper edge of the case and the inner surface of the lid body is added. By using this, we succeeded in forming an accurate high frequency shield relationship. It is as follows.

[0013] (1) A metal plate with an opening and an electric circuit installed and housed inside. A case consisting of a metal case body and a metal lid body that closes the opening of the case body. In the case body, a recess with a symmetrically tapered cross section is formed around the entire periphery of the opening of the case body. A groove is provided in a ring, and a bent part is formed around the entire circumference of the lid body to fit into the groove, and By press-fitting the bent part into the groove, the inner and outer surfaces of the tip of the bent part and both sides of the groove are A pinching contact portion is formed symmetrically between the wall surface and the inner surface of the lid body and the top of the opening. A high-frequency shielding case characterized by being able to form a pressure contact between the edge and the edge. -S.

[0014] (2) A metal case body in which an electric circuit is set and housed, and the case body In a case consisting of a metal lid that closes the opening of the It is formed as a frame-shaped body made of a plate material having an opening on one side or both sides, and the lid body is From the case body, which has a concave groove with a symmetrically tapered cross section around the entire periphery. The opening of the case body, which is a frame-shaped body as described above, is formed of a thick-walled member, and the concave groove is formed of a thick-walled member. By press-fitting the edges, pressure contact is made between the inner and outer surfaces of the opening and both side wall surfaces of the groove. A high frequency shield case characterized by symmetrically formed parts.

[0015] (3) A metal case body with a concave groove with a tapered cross section around the entire periphery. or a first part body, which is a lid body, and a metal body, which is also made of metal and has an edge part that is fitted into the groove. It is formed by the second part body, which is the lid body or the case body, and is fitted into the groove as described above. An adhesive layer is provided on the inner surface of the second part body at least in the recessed groove fitting part. High frequency shield case featuring:

[0016]

[Effect]

A metal case with an opening in which an electric circuit is set and housed. The case consists of a case body and a metal lid that closes the opening of the case body. A concave groove with a symmetrically tapered cross section is provided around the entire periphery of the opening of the case body. However, by forming a bent part on the entire circumference of the lid body to be fitted into the above-mentioned groove. Press the bent portion into the groove and apply a symmetrically balanced pinching force to the inner part of the groove. Opposite action is applied to both sides of the tip side of the part to create an elastic and effective continuous clamping contact part on both the inside and outside. The lid is formed at the center and the lid is pulled out and floated by the balanced clamping force as described above. to prevent It is further preferable that the pinching pressure within the groove be balanced by opposing forces as described above. This will cause deformation or floating in the middle part of both the case and the lid. The mating formed and the associated bonding seam on both sides without forming a condition. to maintain a stable hold state.

[0017] In order to form a pressure contact portion between the inner surface of the lid body and the top edge of the opening as described above, As a result, the shield part can be formed in three layers, and the high frequency shield I hope for completeness.

[0018] A metal case body in which an electric circuit is set and housed, and an opening in the case body. In a case consisting of a metal lid body that closes the It is formed as a frame-shaped body made of a plate material with openings on both sides, and the lid body is attached to its periphery. The case is made of a thicker material than the case body, and has a concave groove with a tapered cross section around the entire circumference. As a result, the case body can be made into a plate shape, which can be easily mass-produced, and it can also be made lighter. On the other hand, the lid body is manufactured using a simple casting method using upper and lower molds, making this type of To improve productivity of a high frequency shield case.

[0019] A case, which is a frame-shaped body as described above, is placed in a groove having a tapered cross section as described above. By press-fitting the edge of the opening in the main body, the gap between the inner and outer surfaces of the opening and both side wall surfaces of the groove is created. By forming symmetrical pressure contact parts on each side, it is possible to achieve the same uniformity as described above. A balanced clamping force is applied to the inner and outer surfaces of the opening of the case body to prevent the lid from being pulled out. Two overlapping shield parts are formed.

[0020] The metal case body has a groove with a symmetrically tapered cross section around the entire periphery. or a first part body, which is a lid body, and a metal body, which is also made of metal and has an edge part that is fitted into the groove. By being formed by the second part body which is the lid body or the case body, it is different from the first part body. The second body is attached by a stable and composite shield.

[0021] A concave groove is formed between the first part body and the second part body assembled as described above. A double-sided adhesive layer is applied to the inner surface of the second part to be fitted into the groove at least in the groove fitting part. By providing this, the assembly relationship between the first part body and the second part body is further made precise, To more effectively prevent extraction and displacement, and to ensure the integrity of the shield.

[0022]

【Example】

A concrete example of the above-mentioned invention according to the present invention is shown in the attached drawings. To explain, this type of high frequency shield case can be used as a distributor or branch. In addition, it is necessary to prevent signal leakage and contamination from outside, and the As shown in FIGS. 1 to 4, the first embodiment includes a case body 1 and a lid, both of which are made of metal. The case body 1 includes an electric circuit board 3 and the like. An output terminal 15 is provided at the input terminal.

[0023] In this embodiment according to the present invention, the opening 11 of the case body 1 as described above has a The peripheral side of the lid body 2 formed into a bowl shape by drawing and having a groove 12 formed on the edge. The bending portion 22 is received at the bending portion 22 at the bottom.

[0024] As shown more clearly in FIG. 4, the groove 12 has both side wall surfaces 13. is symmetrically tapered, so that the bent portion 22 of the lid body 2 press-fitted into the groove portion 12 Both sides are pressed against each other in a wedge-like manner, and each side of the tip is pressed with pressure. The contact parts 5, 5 are formed in succession to ensure a balanced contact shield part. Immediately Since the tapered wall surfaces 13 are arranged opposite each other, it is easy to press-fit the bent portion 22, and the strong concentration The bent portion 22 is compressed with a suitable pressure force, and the inner surface of the lid body 2 and the opening of the case body 1 are Since the pressure contact part 6 is formed between the top edge 7 and the top edge 7, the shielding property against high frequencies etc. is outstanding. It becomes whole.

[0025] As clearly shown in FIG. The lid body 2 is fitted into the groove portion 12 by lowering the inner surface side of the lid body 1 and raising the outer surface side of the lid body 1. The amount of protrusion from the top edge of the case body 1 is small, especially about half the thickness of the lid body 2. The lid body 2 is simply press-fitted by being recessed into the top edge of the outer wall of the groove portion 12. Even if the lid body 2 is only pulled out, the lid body 2 may come out due to the squeezing action of the tapered surface as described above. prevent

[0026] The depth of the groove 12 is at least 3 times the thickness of the lid 2, which is the member to be inserted. It is appropriate to increase the depth by at least 5 times, preferably 5 to 7 times. The length of the bent portion 22 pushed into the lid body 2 is preferably at least twice the thickness of the lid body 2. is 3 to 5 times as shown in FIG. The groove part 12 is properly fitted, and the above-mentioned squeezing action or shielding action is effective. to form a stable set relationship.

[0027] A second embodiment of the invention is shown in FIGS. 5 and 6. That is, the above diagram 1 to 4 use a thick-walled cast body as the case body 1. On the other hand, in the cases shown in Figs. 5 and 6, the case body 1a is formed by drawing a plate material. The electric circuit board 3 is attached to this, and the lid body 2a is attached to the case body 1a. It is obtained as a thick-walled cast body, etc., and a tapered surface 23 is provided oppositely around the entire periphery of the body. A groove portion 24 is formed.

[0028] That is, in the case shown in FIGS. 5 and 6, the case body 1a is placed against the rolled plate material. It can be easily formed into a relatively thin layer and lightweight part by drawing process. On the other hand, the lid body can be similarly easily produced as a cast body between the upper and lower mold materials. Moreover, the pressure bonding is performed between the tapered surfaces 23 in exactly the same way as in the case of FIGS. 1 to 4. The lid body 2 has both tapered surfaces 23, 2 with respect to the case 1. It locks effectively at 3.

[0029] Furthermore, in FIG. 7, the lid body 2a is used to face the top and bottom of the frame-shaped case body 1b. This shows the case, and each lid body 2a is the same as that in FIGS. 5 and 6 described above, The case body 1b can be easily manufactured as a ring-shaped or short cylindrical frame. However, the lid body 2a is viewed from above and below with respect to the case body 1b as shown in FIGS. 5 and 6 above. It is installed in exactly the same way, and is preferable between the case body 1b and each lid body 2a. A stable shield relationship is formed.

[0030] Furthermore, in FIG. 8, the case body has the same structure as in the cases of FIGS. 1 to 4 described above. 1 and the lid body 2, the fitting is fitted into the groove portion 12 formed with the tapered surface. In the case of the one shown in FIG. This shows the case where the groove is formed in the fitting part of the groove 12, and the tapered surface 13 is used. Under the pinching conditions, particularly on the tapered surface 13a, the adhesive effect is compounded. This results in high adhesion and even more stable shield bonding, resulting in high shielding. In particular, watertightness is ensured, and a waterproof structure can be completed.

[0031] As shown in FIG. 8, the inner surface of the lid 2 that is joined to the top edge surface 7 of the opening of the case body By forming the above-mentioned adhesive layer 4 on the area, it is possible to shield and protect that area as well. A watertight seal is completed, and the above-mentioned effects are further improved. Also, this figure 8 Although the cases shown in FIGS. 1 to 4 are representative, a similar adhesive layer 4 is shown in FIGS. 6 and 7 may also be adopted as appropriate.

[0032] In addition, as mentioned above, when using a waterproof type, each connection part must be waterproof. Adopt a connector and be able to modify and implement it as appropriate in each case. Of course.

[0033]

[Effect of the idea]

According to the present invention as explained above, at least a composite shield portion is formed. At the same time, under balanced squeezing force conditions, and without partial deformation or floating of parts. It is possible to form and maintain an accurate shield bond without forming an upper state. Moreover, it can be used to create the desired shield without requiring special and expensive shielding materials. , and eliminates the need for mounting screws and other parts, as well as processing for them. This is a highly effective idea industrially.

[Brief explanation of drawings]

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

FIG. 2 is a cross-sectional side view thereof.

FIG. 3 is a longitudinal side view thereof.

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

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

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

FIG. 7 is a longitudinal sectional side view of yet another embodiment of the present invention.

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

[Explanation of symbols]

1 Case body 1a case body 2 Lid body 2a Lid body 3 Electric circuit board 4 Adhesive layer 5 Pressure contact part 6 Pressure welding part 7 Opening top edge surface 11 Opening 12 Groove 13 Tapered walls on both sides 15 input and output terminals 22 Bend section 23 Tapered surface 24 Groove

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[Procedural amendment]

[Submission date] February 7, 1992

[Procedural amendment 1]

[Name of document to be corrected] Drawing

[Correction target item name] Figure 3

[Correction method] Change

[Correction details]

[Figure 3]

Claims (3)

[Scope of utility model registration request] 1. A case consisting of a metal case body in which an opening is formed and an electric circuit section is set and housed therein, and a metal lid body that closes the opening of the case body. A concave groove with a symmetrical tapered cross section is provided around the entire periphery of the opening of the case body, and a bent part that is fitted into the concave groove is formed around the entire circumference of the lid. By press-fitting the curved portion into the groove, pinch contact portions are formed symmetrically between the inner and outer surfaces of the tip of the bent portion and both side wall surfaces of the groove, and the inner surface of the lid body and the top edge of the opening are formed symmetrically. A high frequency shielding case characterized in that a pressure welding part can be formed between the parts. 2. A case consisting of a metal case body in which an electric circuit section is set and housed, and a metal lid body that closes an opening of the case body, wherein the case body has an opening on one or both sides. The lid body is formed as a frame-shaped part body made of a board material, and the lid body is formed of a thicker member than the case body, which has a groove with a symmetrically tapered cross section around the entire periphery of the lid body. A feature is that by press-fitting the edges of the opening of the case body, which is a frame-shaped body as described above, pinch contact portions are symmetrically formed between the inner and outer surfaces of the opening and both side wall surfaces of the groove. High frequency shield case. [Claim 3] A first part body, which is a metal case body or a lid body, having a groove with a tapered cross section around the entire periphery; An adhesive layer is provided on the inner surface of the second part body, which is a metal lid body or a case body, and which is fitted into the groove as described above, at least in the groove fitting part. A high-frequency shield case characterized by: