JP2009064912A - Electronic circuit module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic circuit module wherein the manufacturing cost of a sheet metal cover body having dividers can be substantially reduced. <P>SOLUTION: In this electronic circuit module equipped with the sheet metal cover body 1 in which a side plate part 4 is provided along four sides of a square top plate part 3 in a frame shape, and dividers 5 which divides a rectangular parallelepiped-shaped space S demarcated by the top plate part 3 and the side plate part 4 to a plurality of spaces are provided, and a circuit board 2 to which the sheet metal cover body 1 is mounted through the space S so as to face the top plate part 3, the sheet metal cover body 1 comprises a sheet of metal plate having four first metal pieces 11 individually extended from four sides of the top plate part 3 and perpendicularly bent at the corresponding sides, and second metal pieces 12 each of which is extended from one end of the first metal piece 11 in its longitudinal direction and bent toward the inside of the space S, the side plate part 4 is formed by the four first metal pieces 11, and the divider 5 is formed by the second metal pieces 12. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electronic circuit module configured by attaching a sheet metal cover body such as a shield case to a circuit board, and more particularly to a structure of a sheet metal cover body having a plurality of partition plates.

  For example, in a wireless communication device or the like, an electronic circuit module configured by attaching a sheet metal cover body such as a shield case to a circuit board on which a high-frequency circuit or the like is disposed may be used. In general, the sheet metal cover body of such an electronic circuit module has a box-like appearance including a square top plate member and a frame-like side plate member along four sides of the top plate member. In order to suppress undesired interference between electronic components mounted on a circuit board, a sheet metal cover body in which a partition plate is arranged on the circuit board is also known. That is, by adding a partition plate that divides a rectangular parallelepiped space defined by the top plate member of the sheet metal cover body and the frame-shaped side plate member into a plurality of small spaces, a specific electronic component on the circuit board and Since another electronic component that is susceptible to the interference can be exposed in different small spaces, the electromagnetic shielding effect of the partition plate can avoid unwanted interference.

However, when the partition plate is added, the number of parts of the sheet metal cover body increases, so that there is a problem that the cost is inevitably increased. Therefore, conventionally, a sheet metal cover body (shield case) has been proposed in which a frame-shaped side plate member and a plurality of partition plates can be formed from a single metal plate (see, for example, Patent Document 1). In such a conventional proposal, the unfolded metal plate is arranged continuously so that the four side wall pieces surround the rectangle, and the partition walls from the inner edges of these side wall pieces to the inside of the rectangle, respectively. A piece is protrudingly provided, and a frame-like side plate member is obtained by bending the inner edges of the four side wall pieces at a right angle with respect to the rectangle, and a plan view is obtained by bending the base ends of the partition wall pieces at a right angle. Four partition plates arranged in a cross shape can be obtained.
Japanese Utility Model Publication No. 2-52396

  If the frame-like side plate member and the plurality of partition plates can be formed from a single metal plate as in the conventional proposal described above, the number of parts of the sheet metal cover body can be reduced. However, it is not possible to significantly reduce the manufacturing cost of the sheet metal cover body because the top plate member is separately required for the sheet metal cover body, and this top plate member must be assembled to the side plate member manually. It was.

  The present invention has been made in view of such a state of the prior art, and an object of the present invention is to provide an electronic circuit module that can significantly reduce the manufacturing cost of a sheet metal cover having a partition plate.

  In order to achieve the above object, the electronic circuit module of the present invention has a side plate portion provided in a frame shape along the four sides of the rectangular top plate portion, and is defined by the top plate portion and the side plate portion. A sheet metal cover body provided with a partition plate that divides a rectangular parallelepiped space into a plurality, and a circuit board to which the sheet metal cover body is attached so as to face the top plate portion through the space, the sheet metal cover From the four longitudinal first metal pieces individually extended from the four sides of the top plate portion and bent at right angles on the corresponding one side, and one end in the longitudinal direction of each first metal piece It is composed of one metal plate having a plurality of second metal pieces that are individually extended and bent into the space, and the side plate portion is formed by the four first metal pieces, and The partition plate is formed by the second metal piece. It was the configuration that.

  The sheet metal cover body of the electronic circuit module configured as described above can easily form the top plate portion, the frame-shaped side plate portion, and the plurality of partition plates from a single metal plate, making it easy to automate the assembly work. In addition, since the waste of material is small, it is possible to manufacture a sheet metal cover body having a partition plate at a very low cost.

  In the above configuration, the first metal piece connected to a part of the first side in a region adjacent to the first side of the top plate part in the unfolded state of the sheet metal cover body before bending, The second metal piece protruding from the first metal piece along the other part of the first side is disposed and is connected to the second side perpendicular to the first side of the top plate portion. Another said 1st metal piece has a tongue piece part which protrudes along the extension line of this 2nd edge, and is adjacent to the said other part of a 1st edge after a bending process, and after a bending process When the partition plate is formed by the second metal piece projecting into the space at right angles to the tongue piece, a plurality of rectangular parallelepiped spaces defined by the top plate and the side plate are formed. It is possible to create a small space having a planar view shape by partitioning with a partition plate.

  Further, in the above configuration, the first metal piece having each side as a long side protrudes outside the four sides of the top plate portion in the unfolded state before the sheet metal cover body is bent. The second metal piece protrudes from one end in the longitudinal direction of the first metal piece along an extended line of the long side, and the second metal piece protrudes into the space from the corner of the side plate after bending. In the case where the partition plate is formed of metal pieces, a rectangular parallelepiped space defined by the top plate portion and the side plate portion can be partitioned by a plurality of partition plates to create a small space having a triangular shape in plan view.

  In any of the above-described configurations, if the sheet metal cover body has four of the second metal pieces, and the space is divided into four by the partition plate made of these second metal pieces, A rectangular parallelepiped space defined by the plate portion and the side plate portion can be subdivided into four small spaces electromagnetically shielded from each other.

  In any of the above configurations, when the mounting leg piece inserted into the mounting hole of the circuit board is protruded from the partition plate of the sheet metal cover body, each partition plate can be easily and accurately with respect to the circuit board. This is preferable because it can be positioned.

  According to the electronic circuit module of the present invention, the sheet metal cover attached to cover the upper surface of the circuit board includes the top plate, the frame-shaped side plate, and the plurality of partition plates. Can be easily formed from a single metal plate, the automation of the assembly work is easy, and the waste of materials is small, so that it can be manufactured at a very low cost. Therefore, it is possible to realize a significant cost reduction of a sheet metal cover suitable as a shield case having an excellent electromagnetic shielding effect.

  FIG. 1 is an exploded perspective view of an electronic circuit module according to a first embodiment of the present invention, and FIG. 2 is a view of a sheet metal cover body used in the electronic circuit module. FIG. 3 is a bottom view, and FIG. 3 is a plan view showing an unfolded state of the sheet metal cover body before bending.

  The electronic circuit module shown in FIG. 1 is mainly composed of a sheet metal cover body 1 made of a single metal plate and having a box-like appearance, and a circuit board 2 to which the sheet metal cover body 1 is attached so as to cover the upper surface. Although not shown, various electronic components are mounted on the circuit board 2 to form a desired electric circuit. In addition, mounting holes 2a for inserting and engaging mounting leg pieces 1a (see FIG. 3) of the sheet metal cover body 1 are formed at a plurality of locations on the circuit board 2, and are formed in the peripheral portions of the mounting holes 2a. Each mounting leg 1a is soldered to a land portion (not shown) provided.

  As shown in FIGS. 1 and 2, the sheet metal cover body 1 includes a square top plate portion 3, a frame-like side plate portion 4 provided along four sides of the top plate portion 3, the top plate portion 3, and the side plate. The rectangular parallelepiped space S defined by the section 4 is composed of four pieces of partition plates 5 that divide the space into four small spaces s1. Since the circuit board 2 is opposed to the top plate portion 3 through the space S by attaching the sheet metal cover body 1, a specific electronic component on the circuit board 2 and another electronic component that is susceptible to the interference can be combined. Unexpected interference can be avoided by projecting in different small spaces s1.

  The sheet metal cover body 1 is formed by punching a single metal plate into a shape as shown in FIG. 3 and then bending it. The sheet metal cover body 10 before bending shown in FIG. 3 includes a top plate portion 3, four rectangular first metal pieces 11 individually extended from four sides of the top plate portion 3, and each first metal. It consists of four second metal pieces 12 individually extended from one end in the longitudinal direction of the piece 11, and a part of each side of the top plate portion 3 is connected to the adjacent first metal piece 11, and this first A second metal piece 12 protrudes from one end in the longitudinal direction of the metal piece 11 along the other part of the side, and a tongue extends from the other end in the longitudinal direction of the first metal piece 11 along the extension line of the side. The piece 11a protrudes. Each first metal piece 11 is bent at a right angle at a boundary line (a part of each side) with the top plate portion 3, and the base end 11 b of the tongue piece portion 11 a and the base end 12 a of the second metal piece 12. 2 is bent at right angles to the first metal piece 11 between the two pieces 11a and 12, and as shown in FIG. 2, a frame-shaped side plate portion comprising four first metal pieces 11 including a tongue piece portion 11a. 4 is obtained, and a four-part partition plate 5 made of four second metal pieces 12 and arranged in a cross shape in a plan view is obtained. That is, the sheet metal cover body 1 is a portion of the first metal piece 11 that excludes the tongue piece portion 11a from each side wall portion that hangs down from each side of the top plate portion 3 toward the circuit board 2 side. And the tongue piece 11a of another first metal piece 11 are arranged side by side, and the second metal piece 12 protrudes from the center of each side wall portion toward the center of the space S. It is a partition plate 5. Since the space S is equally divided into four by the four partition plates 5, each small space s1 has a square shape in plan view and the same size.

  In addition, mounting leg pieces 1 a are projected at two locations on the bottom of each partition plate 5 (one side of each second metal piece 12), and these mounting leg pieces 1 a are attached to corresponding mounting holes of the circuit board 2. Since each partition plate 5 can be easily and accurately positioned with respect to the circuit board 2 by being inserted into and engaged with 2a, the work of attaching the sheet metal cover body 1 to the circuit board 2 can be performed easily and accurately. Then, by soldering these mounting leg pieces 1a to the land portions near the mounting holes 2a, the circuit board 2 and the sheet metal cover body 1 are electrically and mechanically connected. The sheet metal cover body 1 can be grounded through.

  As described above, the sheet metal cover body 1 of the electronic circuit module according to this embodiment has the partition plate 5 for dividing the space S existing between the top plate portion 3 and the circuit board 2. However, this sheet metal cover body 1 can easily form the top plate portion 3, the frame-shaped side plate portion 4 and the plurality of partition plates 5 from one metal plate, and can easily automate the assembly work. Therefore, it can be manufactured at a very low cost.

  FIG. 4 is a bottom view of the sheet metal cover body according to the second embodiment of the present invention, and FIG. 5 is a plan view showing the unfolded state of the sheet metal cover body before bending, corresponding to FIGS. Since the same reference numerals are given to the portions, redundant description is omitted.

  The sheet metal cover body 1 shown in FIG. 4 protrudes from the four corners of the side plate portion 4 toward the center of the space S through a rectangular parallelepiped space S defined by the top plate portion 3 and the frame-like side plate portion 4. The point which is divided by the four partition plates 5 to create four small spaces s2 having a triangular shape in plan view is greatly different from the first embodiment described above. The sheet metal cover body 1 shown in FIG. 4 is formed by punching one metal plate into a shape as shown in FIG. 5 and then bending it. In the sheet metal cover body 10 before the bending process shown in FIG. 5, first metal pieces 11 each having a long side on the outside of the four sides of the top plate portion 3 are projected and each first metal piece. A second metal piece 12 protrudes from one end in the longitudinal direction of 11 along an extension line of the long side. Then, the four first metal pieces 11 are bent at right angles at the four sides of the top plate portion 3, and the base ends 12 a of the second metal pieces 12 are bent at right angles with respect to the continuous first metal pieces 11. As a result, as shown in FIG. 4, a frame-shaped side plate portion 4 made of four first metal pieces 11 is obtained, and arranged along the diagonal line of the top plate portion 3 made of four second metal pieces 12. In addition, four partition plates 5 can be obtained.

  In each of the above embodiments, the rectangular parallelepiped space S of the sheet metal cover body 1 is subdivided into four small spaces by the four partition plates 5, but the number of the partition plates 5 is reduced to reduce the space S to 3 It may be divided into one or two small spaces.

1 is an exploded perspective view of an electronic circuit module according to a first embodiment of the present invention. It is a bottom view of the sheet metal cover body shown in FIG. It is a top view which shows the expansion | deployment state before the bending process of the sheet metal cover body shown in FIG. It is a bottom view of the sheet metal cover body concerning the example of a 2nd embodiment of the present invention. It is a top view which shows the expansion | deployment state before the bending process of the sheet-metal cover body shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sheet metal cover body 1a Mounting leg piece 2 Circuit board 2a Mounting hole 3 Top plate part 4 Side plate part 5 Partition board 10 (Before bending) Sheet metal cover body 11 1st metal piece 11a Tongue piece part 12 2nd metal piece S Space s1, s2 small space

Claims (5)

A side plate provided with a frame shape along the four sides of the square top plate, and a partition plate provided with a partition plate that divides a rectangular parallelepiped space defined by the top plate and the side plate into a plurality of pieces. A cover body, and a circuit board to which the sheet metal cover body is attached so as to face the top plate portion through the space,
The sheet metal cover body is individually extended from four sides of the top plate part and is bent at a right angle at a corresponding side, and four rectangular first metal pieces, and longitudinal directions of the first metal pieces Each side plate portion is formed by four first metal pieces, each of which has a plurality of second metal pieces that are individually extended from one end of the metal plate and bent into the space. And the said partition plate is formed of the said 2nd metal piece, The electronic circuit module characterized by the above-mentioned.   2. The first metal according to claim 1, wherein the first metal is connected to a part of the first side in a region adjacent to the first side of the top plate part in a developed state before the sheet metal cover body is bent. A piece and a second metal piece protruding from the first metal piece along the other part of the first side, and are perpendicular to the first side of the top plate part Another first metal piece connected to the second side has a tongue piece adjacent to the other part of the first side after being bent and projecting along the extension line of the second side. The electronic circuit module is characterized in that the partition plate is formed by the second metal piece projecting into the space at right angles to the tongue piece after bending.   In the description of Claim 1, the said 1st metal piece which makes each side a long side protrudes in the outer side of the four sides of the said top plate part in the expansion | deployment state before the bending process of the said sheet-metal cover body. The second metal piece protrudes from one end in the longitudinal direction of the first metal piece along an extended line of the long side, and protrudes from the corner of the side plate portion into the space after bending. An electronic circuit module, wherein the partition plate is formed of a second metal piece.   The said sheet metal cover body has four said 2nd metal pieces in description of any one of Claims 1-3, The said space is divided | segmented into four by the said partition plate which consists of these 2nd metal pieces. An electronic circuit module characterized by being made.   5. The electronic circuit module according to claim 1, wherein a mounting leg piece to be inserted into the mounting hole of the circuit board protrudes from the partition plate.

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