JP4460545B2 - Electromagnetic shielding housing and method for manufacturing electronic component - Google Patents

Description

  The present invention relates to an electromagnetic shielding housing having a simple structure for preventing leakage of electromagnetic waves, and a method for manufacturing an electronic component provided with electromagnetic shielding.

  An electronic component used at a high frequency cannot ignore the influence of electromagnetic waves emitted from itself or electromagnetic waves emitted from other electronic components. For this reason, in high-frequency electronic devices or electronic devices, individual electronic components are accommodated in a small electromagnetic shielding case to be modularized, or multiple electronic components or electronic devices are accommodated in a relatively large electromagnetic shielding case. In general, the influence of electromagnetic waves is suppressed.

  As this type of electromagnetic wave shielding casing, there has been conventionally known a casing in which a casing and a lid, each of which has improved the accuracy of planar processing, are brought into close contact with each other and fastened with a number of screws (Prior Art 1). However, the electromagnetic wave shielding casing having such a structure requires a high-precision planar processing technique and requires a large number of screws to improve the adhesion between the casing and the lid. For this reason, there is a problem in that assembly man-hours are required and the manufacturing cost of electronic components cannot be suppressed.

  In order to solve such a problem, in the electromagnetic wave shielding casing disclosed in JP-A-9-260881, a shield gasket is sandwiched between the casing and the lid, and at least one of the casing and the lid is A contrivance is provided to provide a notch for the shield gasket to enter when pressed (Prior Art 2).

  In addition, there is an electromagnetic shield casing (prior art 3) disclosed in Japanese Patent Application Laid-Open No. 2002-57472 as a device for reducing the strictness of the processing dimensional accuracy of the casing. In this electromagnetic shield housing, for example, a shield gasket is interposed between a box and a cover to secure a margin during assembly.

  For example, Japanese Patent Application Laid-Open No. 2001-144488 discloses a “module housing structure” (prior art 4) as a means for reducing the cost when housing a plurality of electronic components. In this case structure, the inside of the case body formed by sheet metal processing is defined by a partition plate, and a thin elastic member and a thin metal plate are used as a cover for covering the case body. At the time of assembly, after the electronic component is accommodated in the case body, the cover is fixed in a pressed state.

Japanese Patent Laid-Open No. 9-260881 JP 2002-57472 A JP 2001-144488 A

According to the prior art 2, an effect that the assembling work is facilitated is expected. However, a cutting process or a shield gasket is required for the casing, and there is a certain limit to cost reduction. The point that the shield gasket is required is the same as in the prior art 3. In the prior art 4, although the cost can be reduced as compared with the case where the structure is not adopted, the entire housing must be screwed uniformly, so that the problem of assembly accuracy remains.
This invention makes it the subject to provide the electromagnetic wave shielding housing | casing suitable for mass production which can aim at simplification in both a process and an assembly, hold | maintaining the electromagnetic wave shielding effect.
Another object of the present invention is to provide a method for easily producing an electronic component having an electromagnetic wave shield.

An electromagnetic wave shielding housing provided by the present invention forms a metal bottomed box having an annular opening end and a shielding space for electronic components inside the bottomed box by covering the opening end. And at least one of the surface portion of the lid that faces the opening end and the opening end is integrally formed with a protrusion that is shaped along the opening end. When the opening end is covered with the lid, the projecting body blocks an electromagnetic wave leakage path connecting the inside and outside of the housing.
In the electromagnetic wave shield case having such a structure, the projections block the leakage path of the electromagnetic wave, so that a shield gasket as shown in the conventional techniques 2 to 4 is not necessary. Further, since the protrusion is annular, it is not necessary to cut the casing as in the case of the prior art 2.

  For example, the protrusion is a member that is deformed into a shape that enhances airtightness between the opening end and the lid by applying a pressing force between the opening end and the lid, such as aluminum. It consists of a soft metal member. Or it can also be comprised by the member which penetrate | invades into an opposing surface part, for example, a hard metal member, when pressing force is added between the said opening edge part and the said cover body. In this case, the member to be intruded is a metal member that is softer than the protrusion.

In the electromagnetic wave shielding casing of the present invention, the bottomed cylindrical body is a cylindrical box body having an annular opening end, and the lid has a disk shape whose inner diameter exceeds the inner diameter of the opening end. As a thing, it can also be set as the structure by which the fastening pillar for fixing with the other of the said cylindrical box body and the said cover body is extended in the center part of at least one of the said cylindrical box body and the said cover body. Alternatively, the bottomed cylindrical body is a rectangular box whose opening end is a rectangular ring, and the lid is a rectangular box of a size that covers the opening end, and the rectangular box and the lid At least one central portion may have a structure in which a fastening column for fixing to the other of the rectangular box and the lid is extended. The fastening column is, for example, for fixing with a screw.
By using a cylindrical box body and an annular lid body, the bottomed cylinder body and the lid body can be manufactured by, for example, shearing processing or lathe processing that is easier to process, so that cutting / cutting is possible. / The machining process of the workpiece is simplified as compared with the case of forming a rectangular bottomed cylinder that requires slicing. In addition, since only one screw is required regardless of the shape of the box and the lid, the time required for assembly after mounting the electronic components is reduced, and mass production becomes possible.

The method of manufacturing an electronic component according to the present invention includes a step of manufacturing a metal bottomed box body in which protrusions are integrally formed at an annular opening end by lathing a predetermined workpiece, and the bottomed A step of mounting an electronic component on the inner bottom or inner wall of the box, a step of positioning the metal lid exceeding the inner diameter of the opening end and the bottomed box, and the lid or The projecting body is deformed by applying a pressing force to the bottomed box, or the projecting body is caused to enter the facing surface portion of the lid, whereby the electronic component is placed inside the bottomed box. A method for producing an electromagnetically shielded electronic component including a step of forming a shield space.
In this manufacturing method, the lid body may include a step of manufacturing a predetermined workpiece body by lathing.

In another electronic component manufacturing method according to the present invention, a predetermined workpiece body is turned to form a protrusion having a shape along the opening end of a metal bottomed box having an annular opening end. A step of manufacturing an integrally formed metal lid, a step of mounting an electronic component on the inner bottom or inner wall of the bottomed box, and a step of positioning the lid and the bottomed box And by applying a pressing force to the lid body or the bottomed box body, the projection body is deformed, or the projection body is made to enter the opposed opening end portion, whereby the bottomed box body Forming a shield space for the electronic component inside the electronic component.
This manufacturing method may include a step of manufacturing the bottomed cylindrical body by turning a predetermined workpiece body.
In each of the manufacturing methods described above, a fastening column for fixing the bottomed box body and the other of the lid body to a center portion of at least one of the bottomed box body and the lid body is provided. When the body or the lid is manufactured by lathe processing, the bottomed box and the lid may be fixed by the fastening column in the state where the pressing force is applied.

  According to the present invention, electromagnetic shielding can be performed by simply pressing and fixing the lid and the bottomed cylindrical body without using any auxiliary member such as a shielding gasket. It is possible to mass-produce electronic parts that are subjected to electromagnetic wave shielding, and the effect of significantly reducing these manufacturing costs compared to those manufactured by the prior art can be obtained.

Embodiments of the present invention will be described below with reference to the drawings.
<Structure of electromagnetic shielding housing>
FIG. 1 is an external perspective view showing an embodiment of an electromagnetic wave shielding casing of the present invention, and FIG. 2 is a side sectional view showing a state immediately before mounting and assembling electronic components on the electromagnetic shielding casing. It is.
The electromagnetic wave shielding housing of this embodiment has a bottomed cylindrical box body 10 and a lid body 20 and has a structure that can be fixed with one screw (male screw) 30.

  The cylindrical box body 10 has an annular opening end 12, and a fastening column 11 extends from the center of the inner bottom surface toward the lid body 20 in order to fix the lid body with screws. . The cylindrical box body 10 is made of, for example, aluminum. A thin protrusion 13 that is easily crushed is integrally formed with the open end 12. The tip of the protrusion 13 is directed to the surface portion of the facing lid 20.

  The lid 20 is a metal disk having an inner diameter that exceeds the inner diameter of the open end 12, and a hole for inserting a screw 30 is provided at the center. The material is preferably a hard metal such as brass that is harder than the cylindrical box 10, but when the protrusion 13 is formed very thin, the same aluminum as the cylindrical box 10 may be used.

  The electronic component is stored in the storage space 40 formed by the inner bottom portion and the inner wall portion of the cylindrical box body 10. In FIG. 1 and FIG. 2, the illustration of the electronic component and the connector for electrically connecting the electronic component to an external circuit is omitted for convenience. Electronic components include not only a single element but also those formed on a circuit board.

  In the state shown in FIG. 2, in the process of tightening the screw 30, first, the protrusion 13 and the inner surface of the lid body 20 abut, and thereafter, a pressing force is gradually applied from the lid body 20 side. Thereby, as shown in FIG. 3A, the protrusion 13 is gradually crushed into a shape that enhances the airtightness between the opening end 12 and the lid 20 from the tip. Then, when the screwing is finished and the opening end 12 is covered with the lid 20, the protrusion 13 blocks the electromagnetic wave leakage path connecting the inside and outside of the housing, and the storage space 40 is made a shield space for electronic components. To do.

In the electromagnetic shielding housing having such a structure, the cylindrical box body 10 and the lid body 20 are turned, that is, the workpiece is rotated, the cutting tool is applied to the rotating workpiece, and the cutting tool is moved. it can be easily shaped by, how addressed byte, by varying the feed way, than Ru can be easily realized such holes and threading the screw 30, it is possible to mass production in a short time. Moreover, since it can assemble with only one screw 30, the assembly process is simplified. As a result, the electromagnetic shielding casing can be mass-produced in a short time, and as a result, the manufacturing cost can be significantly reduced as compared with the conventional equivalent products.

<Modification>
The example in the case where the protrusion 13 is deformed (crushed) by the pressing force has been described above. However, as shown in FIG. 3B, for example, the protrusion 13 is allowed to enter the cover 20 or be deformed. You may make it infiltrate. Further, in the above example, the protrusion 13 is integrally formed from the opening end 12 of the cylindrical box 10, but as shown in FIG. 4A, along the opening end 12 inside the lid 20. The protrusion 21 may be integrally formed in a shape (annular shape). Further, as shown in FIG. 4B, the cylindrical box body 10 and the lid body 20 may be formed with their positions shifted from each other.

  Note that the protrusion 13 (21) only needs to be able to block the leakage path of the electromagnetic wave that connects the inside and outside of the housing, so the degree of deformation or the depth of penetration is not a problem. For example, in the example shown in FIG. 4B, when the protrusions 13 and 21 are engaged with each other to such an extent that the leakage path of electromagnetic waves can be blocked, the protrusions 13 and 21 do not necessarily need to be deformed.

<Method for manufacturing electronic parts>
Next, with reference to FIG. 5, the manufacturing method of the electronic component of this invention is demonstrated.
First, a lathe process is performed on the workpiece to manufacture the cylindrical box body 10 shown in FIGS. 1 and 2 and the lid body 20 having a hole formed in the center. About the cylindrical box body 10, the fastening pillar 11, the opening edge part 12, and the protrusion 13 which were made by threading are manufactured together. When the protrusion 21 is formed on the lid 20, it is integrally formed in this step (step S1).

Next, an electronic component is mounted in the storage space 40 of the cylindrical box body 20 (step S2). Wiring or the like for enabling electrical connection with an external circuit is performed as necessary.
Then, after positioning so that the cover body 20 may seal the opening end part 12 of the cylindrical box body 10 (step S3), the cover body 20 is obtained by gradually applying a pressing force by tightening the screw 30 with a screwdriver. Is fixed to the cylindrical box 10. Thereby, the electromagnetic wave shielding space (housing space 40) which covered the inside of the cylindrical box 10 with the lid 20 is formed (step S4).
An operation check of the electronic component mounted in the electromagnetic wave shielding space is performed (step S5). When it is confirmed that the electronic component operates normally, the electromagnetic wave shielding housing in which the electronic component is mounted is commercialized.

  In the above description, the bottomed cylinder is a cylindrical box and the lid is assumed to be annular. However, the shape of the bottomed cylinder is a rectangular box whose opening end is a rectangular ring. It may be. In this case, the lid body has a rectangular shape with a size covering the opening end. Even in the electromagnetic shielding case having such a structure, a fastening column for fixing the other of the rectangular box and the lid is extended at the center of at least one of the rectangular box and the lid. Is the same as that of the structure mentioned above.

  As described above, according to the method of manufacturing an electronic component of this embodiment, since the processing process of the electromagnetic wave shielding casing and the assembly process after mounting the electronic component are simple, mass production of the electronic component subjected to the electromagnetic wave shielding is easy. Thus, the problems due to the prior arts 1 to 4 can be solved at once.

  INDUSTRIAL APPLICABILITY The present invention can be used in general fields that deal with electronic devices that use electronic components that are used in a frequency band in which leakage of electromagnetic waves is a problem.

The external appearance perspective view of the electromagnetic wave shielding housing | casing of this invention. Side surface sectional drawing which showed the state immediately before mounting and assembling an electronic component in an electromagnetic wave shielding housing | casing. (A) is the figure which showed the state which the protrusion deform | transformed and interrupts | blocks the leakage path of electromagnetic waves inside and outside a housing | casing, (b) shows the leakage path of electromagnetic waves inside and outside a housing | casing when a protrusion penetrate | invades a cover part. The figure which showed the state to interrupt | block. (A) is the figure which showed the state which formed the projection body inside the cover body, (b) was the figure which showed the state which formed the protrusion body in both the cover body and the opening edge part. Explanatory drawing which showed the manufacturing method of the electronic component in which the electromagnetic wave shield was given.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Cylindrical box body with bottom 11 Fastening pillar 12 Open end 13, 21 Protrusion 20 Lid 30 Screw (male screw)
40 Electronic component storage space (shield space)

Claims (8)

A bottomed box-metallic in cylindrical having an open end of the annular, the bottomed box body by its inner diameter to cover the disc-shaped and has the open end of the size greater than the inner diameter of the open end And a metal lid for forming a shield space for electronic components inside,
At least one of the surface portion of the lid body that faces the opening end portion and the opening end portion is integrally formed with a protrusion along the opening end portion,
A fastening column for fixing the bottomed box body and the other of the lid body is extended at the center of at least one of the bottomed box body and the lid body,
When the open end is covered with the lid, the projection blocks the electromagnetic wave leakage path connecting the inside and outside of the housing,
Electromagnetic shielding case. The protrusion is formed of a member that is deformed into a shape that enhances airtightness between the opening end and the lid when a pressing force is applied between the opening end and the lid.
The electromagnetic wave shielding housing according to claim 1. The protrusion is made of a member that enters the facing surface portion when a pressing force is applied between the opening end and the lid.
The electromagnetic wave shielding housing according to claim 1. The fastening column is for fixing with screws,
The electromagnetic wave shielding housing according to any one of claims 1 to 3 . By turning a predetermined workpiece material, a circular protrusion at the open end of the annular fastening posts on Rutotomoni center is integrally formed is formed, a process for producing a metallic bottomed box body with cylindrical When,
Mounting electronic components on the inner bottom or inner wall of the bottomed box,
A step of positioning the metal lid and the bottomed box in a disc shape having a size exceeding the inner diameter of the opening end,
By applying a pressing force to the lid body or the bottomed box body, the projection body is deformed, or the projection body is caused to enter the facing surface portion of the lid body, thereby, the inside of the bottomed box body Forming a shield space for the electronic component ,
Including the step of fixing the bottomed box body and the lid body with the fastening column in a state where the pressing force is applied ,
A method for manufacturing an electromagnetic shielded electronic component. Including the step of producing the lid by turning a predetermined workpiece.
The manufacturing method of the electronic component of Claim 5 . Fastening a predetermined workpiece material by turning, in the projection of the shape along the opening end portion is integrally formed Rutotomoni central metallic bottomed box body cylindrical having an open end of the annular A step of manufacturing a metal lid in a disk shape with pillars formed ;
Mounting electronic components on the inner bottom or inner wall of the bottomed box,
Positioning the lid and the bottomed box; and
By applying a pressing force to the lid body or the bottomed box body, the projection body is deformed, or the projection body is allowed to enter the opposed opening end portion, whereby the inside of the bottomed box body Forming a shield space for the electronic component ,
Including the step of fixing the lid and the bottomed box with the fastening column in a state where the pressing force is applied ,
A method for manufacturing an electromagnetic shielded electronic component. Including the step of manufacturing the bottomed cylindrical body by lathing a predetermined workpiece body,
The manufacturing method of the electronic component of Claim 7 .

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