JP2001267785A - Electronic part and assembling method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a manufacturing cost for working/manufacturing a metal case. SOLUTION: Two sidewalls 16 and 18 extend mutually almost in the same direction after being bent at a lateral side 14A of a top plate 14. A piece part 20 is bent at a side 16A of the sidewall 16 while a piece 22 is bent at a side 18A of the sidewall 18, and the pieces 20 and 22 extend in face to face with each other, along a pair of longitudinal sides 14B of the top plate 14. The total length of the pieces 20 and 22 is longer then the longitudinal side 14B of the top plate 14 so that tip sides of two pieces 20 and 22 overlap each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic component in which a circuit board is housed in a metal case and arranged vertically.
It is suitable for an electronic component requiring a shield such as a DC / DC converter.

[0002]

2. Description of the Related Art Conventionally, as an electronic component having a structure in which a circuit board is housed in a metal case in a vertical state and covered by a metal case, a rectangular ceiling disclosed in Japanese Patent Application Laid-Open No. H11-220284 is known. One with a plate and four side walls is known. Also, in this publication, a retaining claw is formed at the end of a side wall constituting a metal case, and after the circuit board and a mold case supporting the circuit board are inserted, the retaining claw is bent to be bent. By locking the board, the circuit board and the mold case were prevented from falling out of the metal case.

[0003]

However, in the developed shape shown in FIG. 9 before the metal case is bent, the ratio of wasted material is large and the material cost is high. Furthermore, in order to prevent the mold case and the circuit board from falling out of the metal case, it is necessary to form the retaining claw after these components are assembled, and this increases the number of processing steps and the processing cost. I was The present invention has been made in view of the above circumstances, and has as its object to provide an electronic component and an electronic component assembling method capable of reducing a manufacturing cost for processing and manufacturing a metal case.

[0004]

According to a first aspect of the present invention, there is provided an electronic component in which a circuit board is housed in a metal case formed of a single metal plate and shielded. A top plate formed in a rectangular shape having a horizontal side and a pair of vertical sides extending in a direction intersecting with the horizontal side, and each of the top plates is bent at the pair of horizontal sides and extends along substantially the same direction as each other. One metal plate comprising: two side walls formed in a shape; and two pieces each bent at a side of the side wall extending across the horizontal side and extending along the vertical side and facing each other. The sum of the lengths of the two pieces is made longer than the vertical side of the top plate, and the tip sides of the two pieces overlap each other.

According to the first aspect of the present invention, the top plate has a pair of lateral sides facing each other and a pair of vertical sides extending in a direction intersecting the lateral sides, and the top plate has a rectangular shape. It is formed into a shape. Two side walls are formed by being bent at a pair of lateral sides of the top plate and extending substantially in the same direction. Further, two pieces are provided so as to be bent with respect to the side wall at the side of the side wall extending crossing the horizontal side and to extend along the vertical side and to face each other.

A single metal plate includes the top plate, two side walls, and two pieces, and the total length of the two pieces is longer than the vertical side of the top plate. Are overlapped with each other so that a metal case is formed by a single metal plate, and a circuit board is housed in the metal case to form a shielded electronic component.

From the above, from the pair of side walls connected to the top plate,
By protruding a piece for forming another side wall that is disposed to intersect with these side walls, material removal is more efficient than the metal case according to the related art, and optimization of material removal is achieved. Material yield is improved. As a result, the amount of material to be discarded when manufacturing the metal case is reduced, so that not only the cost of material can be reduced, but also the environment is excellent. Furthermore, by making the punching shape efficient so that the material yield is improved, the die cost can be reduced with the small punching shape that can be pressed even with a small press die, and the total manufacturing cost can be reduced. Cost reduction can be achieved.

According to the invention described in claim 2, according to claim 1
In addition to the configuration similar to that of the electronic component described above, there is a configuration in which two sets of two pieces are provided corresponding to each of a pair of vertical sides. In other words, two sets of two pieces are provided corresponding to the pair of vertical sides so as to form another pair of side walls arranged so as to intersect with the pair of side walls. Will increase.

According to a third aspect of the present invention, there is provided an electronic component in which a circuit board is housed and shielded in a metal case formed of a metal plate, and a pair of lateral sides facing each other and an intersection with the lateral sides are provided. A top plate formed in a rectangular shape having a pair of vertical sides extending in a direction in which the top plate is formed, and two side walls formed so as to be bent along the pair of horizontal sides and extend substantially in the same direction with each other. A piece bent along the side of the side wall extending across the horizontal side and extending along the vertical side, the metal plate having a concave portion provided on the circuit board, and a convex portion engaging the concave portion on the one side. A part is provided.

According to the third aspect of the present invention, the top plate has a pair of lateral sides facing each other and a pair of vertical sides extending in a direction intersecting the lateral sides, and It is formed into a shape. Two side walls are formed by being bent at a pair of lateral sides of the top plate and extending substantially in the same direction. Further, a piece is provided that is bent with respect to the side wall at a side of the side wall extending crossing the horizontal side and extends along the vertical side, and a convex portion that engages with a concave portion provided on the circuit board is provided. It is provided on one side.

That is, by providing a projection on one side to engage with the recess provided on the circuit board, the circuit is applied in a state where a force is applied so that the opening of the metal case is slightly opened by utilizing the elastic deformation of the metal. With a simple operation of inserting the board and then releasing the force to eliminate the extra opening of the opening, the concave part of the circuit board and the convex part of one part are engaged, and the circuit from inside the metal case is This prevents the substrate from falling off. Therefore, it is not necessary to bend the retaining claw protruding from the metal case as in the prior art, and the manufacturing cost is reduced.

According to the invention described in claim 4, according to claim 3,
In addition to the configuration similar to that of the electronic component described above, the one part is formed as two pieces that extend in opposition to each other, and a step is formed on at least one of these two pieces. The two pieces are made to overlap each other on the distal end side, a first projection is formed on one of the two pieces, and a second projection sandwiching the circuit board with the first projection is the other. Is formed in one of the two parts.

That is, according to the present invention, since the position of the circuit board is regulated by being sandwiched between the first projecting portion and the second projecting portion, the circuit board is fixed after the circuit board is inserted into the metal case. In addition to the need to perform processing for the purpose and to insert the mold case that supports the circuit board into the metal case as in the conventional technology, the manufacturing cost for manufacturing the mold case is also reduced. Become.

According to a fifth aspect of the present invention, there is provided a method for assembling an electronic component, comprising: a metal case having two side walls connected to a top plate and two pieces extending from the side walls, one end of which is an opening; Thereafter, a force is applied to the metal case to deform the metal case within the range of elastic deformation so that the opening side of the metal case is expanded, and in this state, the circuit board in which the concave portion is formed in advance is opened. It is characterized by being inserted into the metal case from the side of the part, and then releasing the force applied to the metal case so that the convex part provided in advance on the one part is engaged with the concave part of the circuit board.

According to the fifth aspect of the present invention, a metal case is provided by applying force to a metal case having two side walls connected to the top plate and two pieces each extending from the side walls. With the case elastically deformed, the circuit board in which the concave portion is formed in advance is inserted into the metal case in a state where the opening side of the two metal portions is slightly widened.
Thereafter, the force applied to the metal case is released, and the convex portion provided on one side, for example, near the opening of the metal case is engaged with the concave portion of the circuit board.

Therefore, one of the two side walls connected to the top plate is protruded from one side for forming another side wall intersecting these side walls, so that the front ends of the one side overlap each other. As a result, the material removal is more efficient than the metal case according to the related art, and the material removal is optimized, and the material yield is improved. As a result, as in the case of the first aspect, the amount of material to be discarded is reduced, so that the material cost and the die cost can be reduced, so that not only the total cost can be reduced but also the environment is excellent. .

Further, the circuit board is inserted by slightly opening the opening of the metal case by utilizing the elastic deformation of the metal, and thereafter, the force is released and the opening amount of the opening is reduced by a simple operation. The concave portion provided on the circuit board and the convex portion provided on one piece are engaged with each other, so that the circuit board can be prevented from dropping out of the metal case. Therefore, as in claim 3,
The process of bending the retaining claw is not required, and the manufacturing cost is reduced.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be clarified by describing embodiments of an electronic component according to the present invention with reference to the drawings. According to one embodiment of the present invention, DC /
FIGS. 1 and 2 show a metal case 12 which is an outer frame of an electronic component 10 which is a DC converter. These FIGS. 1 and 2
As shown in FIG. 1, a rectangular top plate 14 having a pair of horizontal sides 14A and a pair of vertical sides 14B is provided in the metal case 12 formed of a steel plate having a thickness of 0.4 mm. Then, a pair of lateral sides 14A constituting the top plate 14
The two side walls 16 and 18 are formed in such a manner that they are respectively bent at substantially the same direction.

The side wall 1 of these two side walls 16 and 18
6 are bent at the sides 16A along the case height direction (Z direction in FIG. 2) on both sides of the case 6, and along the case height direction on both sides of the side wall 18 facing the side wall 16. The piece 22 is bent at the side 18A, and the two pieces 20 and 22 are provided along the pair of vertical sides 14B of the top plate 14 and extend so as to face each other. .

Further, as shown in FIG. 3, the sum of the length W1 of the piece 20 and the length W2 of the piece 22 is made longer than the depth W which is the length of the vertical side 14B of the top plate 14. Thus, the tip sides of the two pieces 20 and 22 overlap each other. Further, a step portion 20C for slightly shifting the tip end side to the inside of the metal case 12 is formed in the piece portion 20 so as to extend in the case height direction. Due to the presence of the step portion 20C, these piece portions 20, 22 overlap each other without any problem.

On the other hand, the top plate 14 is
A circuit board 30 having substantially the same width dimension as the length of the horizontal side 14A is accommodated, and concave portions 30A are provided at both ends near the lower portion of the circuit board 30, respectively.
On the other hand, a protrusion 20B for engaging with the recess 30A of the circuit board 30 is provided on the portion 20 near the opening 12A of the metal case 12 in the Y direction in FIGS. It is provided to protrude.

Further, a first protruding portion 20A is similarly provided on the rear side of the metal case 12 of the piece 20 as shown in FIGS.
Are projected toward the Y direction of the side wall 18.
The second protruding portion 22A is formed at three locations along the case height direction on the piece portion 22 formed by bending. The second protruding portions 22A are provided so as to protrude in the X direction in FIG. 4, respectively, and slits are formed on both sides of the second protruding portion 22A so as to easily protrude.

When the gap between the first projection 20A and the second projection 22A is not provided with the circuit board 30,
The thickness is the same as or slightly smaller than the thickness of the circuit board 30, and the gap between the protrusion 20 </ b> B and the second protrusion 22 </ b> A is smaller than the thickness of the circuit board 30. As described above, the first protrusion 20A and the second protrusion 22
A restricts the position of the circuit board 30 by sandwiching the circuit board 30 with A, and the protrusion 20B is engaged with the recess 30A to prevent the circuit board 30 from coming out of the metal case 12. Become.

Furthermore, a pair of legs 24 are formed at the lower portions of the two side walls 16 and 18 so as to protrude one by one, and connection terminals 32 protrude from the circuit board 30. Therefore, as shown in FIG. 1, the legs 24 of the metal case 12 and the terminals 32 of the circuit board 30 are inserted into the holes of the printed circuit board 34, respectively, and the legs 24 and the terminals 32 are crimped or soldered. , And is electrically connected to the printed circuit board 34. In this case,
The legs 24 are connected to the ground pattern of the printed circuit board 34 to shield the circuit on the circuit board 30.

Next, assembly of the electronic component 10 according to the present embodiment will be described. A circuit for a DC / DC converter is previously arranged on a substrate having a concave portion 30A at an end to form a circuit substrate 30 shown in FIG. Further, by punching a plate-shaped metal material by pressing and forming a single metal plate 40 shown in FIG. 7 which has been punched out, as shown in FIG. 2 and FIG.
Side walls 16, 18 and two pieces 2 each extending from side sides 16 A, 18 A on both sides of these side walls 16, 18.
A hexahedral metal case 12 having 0 and 22 and one end of which is an opening 12A is formed. At the time of this press working, the first protrusion 20A, the protrusion 20B, the step 20C,
The second protruding portion 22A, the leg portion 24 and the like will be formed.

On the other hand, aside from the press working of the metal case 12, a jig 42 shown in FIGS. 5 and 6 for inserting the circuit board 30 into the metal case 12 is prepared in advance. A groove 44 having a width into which the metal case 12 is loosely fitted is provided at the center of the jig 42.
Magnets 48 are respectively arranged on a pair of wall portions 46 of the jig 42 forming the groove portions 44. After the metal case 12 is pressed, the metal case 12 is inserted into the groove 44 of the jig 42, and a magnetic force is applied to the metal case 12 by a pair of magnets 48 installed on the jig 42, and the metal case 12 is cantilevered. The distal ends of the two side walls 16 and 18 are opened within a range of elastic deformation. As a result, the metal case 12 is deformed so that the opening 12A side of the metal case 12 is slightly widened.

That is, as shown in FIG. 5 showing a state in which the circuit board 30 is inserted, the side wall 16 is pulled in the direction A and the side wall 18 is pulled in the direction B by magnetic force, and the space between the side walls 16 and 18 is widened. . The circuit board 30 is dropped by its own weight into the opening 12A of the metal case 12 in a state where the space between the side wall 16 and the side wall 18 is widened so that the circuit board 30 can be easily inserted.
B, the circuit board 30 is inserted into the metal case 12 while being guided by the first protrusion 20A and the second protrusion 22A.

Next, the metal case 1 is removed from the jig 42, for example.
2 is removed and the magnetic force applied to the metal case 12 is released, so that the opening amount of the opening 12A returns to the size before entering the groove 44, and the circuit board 30 is inserted into the metal case 12. FIG. That is, the projection 20B provided on the piece 20 near the opening 12A of the metal case 12 engages with the recess 30A provided on the end of the circuit board 30. As described above, the circuit board 30 is housed in the metal case 12 formed by the single metal plate 40, and the shielded electronic component 10 is completed.

Next, the operation of the electronic component 10 of the present embodiment and the method of assembling the same will be described. The top plate 14 of the metal case 12 applied to the present embodiment has a pair of horizontal sides 14A facing each other and a pair of vertical sides 14B extending in a direction intersecting the horizontal sides 14A, and has a rectangular shape. It is formed. Two side walls 16 and 18 are formed by being bent at a pair of lateral sides 14A of the top plate 14 and extending substantially in the same direction. Further, the side walls 16 and 18 on both sides of the side walls 16 and 18 extending crossing the horizontal side 14A are bent with respect to the side walls 16 and 18 respectively, and extend along the pair of vertical sides 14B and face each other. In the form, two sets of two pieces 20 and 22 are provided.

Therefore, one metal plate 40 not only includes the top plate 14 and the two side walls 16 and 18 but also
It has two pieces 20 and 22 for forming another side wall arranged to intersect with one side wall 16 and 18. Furthermore, the length W of the two pieces 20, 22 facing each other is W
1, the sum of W2 is longer than the length W of the vertical side 14B of the top plate 14, so that the tip ends of the two pieces 20, 22 overlap each other. That is, the two pieces 20, 2
2 are overlapped with each other, the other side wall is formed, and the metal case 12 is formed by one metal plate 40. The circuit board 30 is housed in the metal case 12 and the electronic component is shielded. It becomes 10.

As described above, the two side walls 1 connected to the top plate 14
By projecting pieces 20, 22 for forming other side walls arranged to intersect these side walls 16, 18, from the metal case 12, more efficient material removal than the metal case 12 according to the prior art. As a result, the material removal is optimized, and the material yield is improved. As a result, the amount of material to be discarded when manufacturing the metal case 12 is reduced, so that not only the material cost is reduced, but also the environment is excellent. Furthermore, by making the punching shape efficient so that the material yield is improved, the die cost can be reduced with the small punching shape that can be pressed even with a small press die, and the total manufacturing cost can be reduced. Cost reduction can be achieved.

On the other hand, in the present embodiment, a step portion 20C is formed on the piece portion 20, and the step portion 20C overlaps the piece portion 22 on the tip end side of the piece portion 20. Also, a first protruding portion 20A is formed on the piece portion 20, and a second protruding portion 22A sandwiching the circuit board 30 with the first protruding portion 20A is formed on the piece portion 22. That is, since the position of the circuit board 30 is regulated by being sandwiched between the first projecting portion 20A and the second projecting portion 22A, the circuit board 30 is inserted into the metal case 12 after the circuit board 30 is inserted into the metal case 12. As there is no need to provide any means for fixing the mold case or to insert the mold case supporting the circuit board 30 into the metal case 12 as in the prior art, the manufacturing cost for manufacturing the mold case also increases. Will be reduced.

On the other hand, in the present embodiment, a concave portion 30A is provided at both ends of the circuit board 30, and a convex portion 20B which engages with the concave portion 30A is provided on the piece portion 20. That is, the protrusion 2 that engages with the recess 30A provided on the circuit board 30.
The circuit board 30 is inserted in a state where a force is applied so that the opening 12A of the metal case 12 is slightly opened by utilizing the elastic deformation of the metal by providing 0B in the one part 20, and thereafter the force is released. With a simple operation that only removes the excessive opening of the opening 12A, the concave portion 30A of the circuit board 30 and the convex portion 20B of the piece 20 are engaged to prevent the circuit board 30 from dropping out of the metal case 12. Can be achieved.

Therefore, it is not necessary to bend the stopper nails protruding from the metal case as in the prior art, and the manufacturing cost is further reduced. Further, in the related art, since the retaining claw is bent at about 90 ° at this time, there is a risk that a crack may enter the bent portion of the retaining claw and the retaining claw may come off the metal case. In other words, when the metal case is in such a state, the product is determined to be defective. Therefore, in the present embodiment, it is possible to reduce the manufacturing cost as the number of defective products is reduced and the product yield is improved.

Next, the result of comparing the area of the unnecessary portion between the metal case 112 of the prior art and the metal case 12 of the present embodiment will be described below. Metal case 1 disclosed in Japanese Patent Application Laid-Open No. 11-220284 as a prior art
FIG. 8 shows an overall view of the conventional metal case 11.
2 is shown in FIG. The metal case 112 has a structure in which not only the pieces 120 and 122 protrude from the two side walls 116 and 118, respectively, but also the piece 124 protrudes from the top plate 114 in order to form the side wall 126. I have.

The height of the metal case 112 is H, the width is L, the depth is W, and the two pieces 120 forming the side wall 126 of the metal case 112 are
When the length of each of 122 is set to 0.4 W, when a plate-shaped metal material is punched out and formed by press working to form the metal case 112 of the related art, an unnecessary portion is a hatched portion S. Yes, 4xH (H-0.4W)
Area. Specifically, the width dimension L is 30 mm,
When the height dimension H is 20 mm and the depth dimension W is 10 mm, the area of the unnecessary material is 1280 mm ² .

On the other hand, the metal case 12 according to the present embodiment, in which the external dimensions of the finished product are the same as those of the metal case 112 of the prior art, is similarly punched out of a plate-shaped metal material and formed by pressing. 7, if the length of each of the two pieces 20 and 22 constituting the side wall of the metal case 12 is 0.6 W, the area of the hatched portion S is 2 × 0. the .6W ^2. Specifically, when a metal case having the same dimensions as the above-described conventional metal case 112 is used, the area of the unnecessary material is about 1/10 of the conventional technology, that is, 120 mm ² .

It is to be noted that the hatched portion S which is not required in any of the developed shapes is the same because 4H (H-0.4W) = 1.
In the case of 2W ² , the area of the hatched portion S, which is an unnecessary portion, is smaller in the metal case 12 according to the present embodiment than in the metal case 112 of the related art in a range where H / W ≧ 0.78. Become.

On the other hand, in the above embodiment, a steel plate is used as the metal material, but other metal materials such as copper and aluminum having a shielding effect may be used. Furthermore, in the above-described embodiment, the opening is slightly opened by the magnet when the circuit board is inserted into the metal case, but the opening may be manually opened by an operator, opened by suction with air, or opened by a machine. You may. On the other hand, in the above embodiment, the DC / DC converter is used as the electronic component. However, the present invention can be applied to other electronic components requiring a shield.

[0040]

According to the electronic component and the method of assembling the electronic component of the present invention, the manufacturing cost for processing and manufacturing the metal case can be reduced.

[Brief description of the drawings]

FIG. 1 is a side view of an electronic component according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the electronic component according to the embodiment of the present invention.

3A and 3B are diagrams showing an electronic component according to an embodiment of the present invention, wherein FIG. 3A is a plan view, FIG. 3B is a front view, and FIG. 3C is a right side view; (D) is a left side view.

FIG. 4 is a sectional view taken along line 4-4 of FIG. 3;

FIG. 5 is a view showing a state in which a metal case applied to the electronic component according to one embodiment of the present invention is placed in a jig, and is a view in which the metal case is partially cut away.

FIG. 6 is a view showing a state in which a metal case applied to the electronic component according to the embodiment of the present invention is taken out of the jig, and is a view in which the metal case is partially cut away.

FIG. 7 is an exploded view showing a strip of a metal case applied to the electronic component according to the embodiment of the present invention.

FIG. 8 is a perspective view of an electronic component according to the related art.

FIG. 9 is an exploded view showing a strip of a metal case applied to an electronic component according to the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Electronic component 12 Metal case 14 Top plate 16, 18 Side wall 20, 22 One piece 20A 1st protrusion 20B Convex 22A 2nd protrusion 30 Circuit board 30A Depression

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4E360 AB12 BA08 BC05 CA02 EA18 ED06 ED08 ED27 GA06 GA34 GB97 GC02 5E321 AA02 CC02 CC03 GG01

Claims (5)

[Claims] An electronic component in which a circuit board is housed and shielded in a metal case formed of a single metal plate, wherein the electronic component is disposed in a pair of lateral sides facing each other and in a direction intersecting these lateral sides. A top plate formed in a rectangular shape having a pair of vertical sides extending, two side walls formed by being bent along the pair of horizontal sides and extending along substantially the same direction as each other; The two pieces being bent at the sides of the side wall extending intersecting with each other and extending along the vertical side and facing each other; and the total length of the two pieces is provided. Is longer than the vertical side of the top plate,
An electronic component, wherein the tip sides of two pieces overlap each other. 2. The electronic component according to claim 1, wherein two sets of two pieces are provided corresponding to each of the pair of vertical sides. 3. An electronic component in which a circuit board is housed and shielded in a metal case formed of a metal plate, wherein the electronic component includes a pair of lateral sides facing each other and a pair of lateral sides extending in a direction intersecting the lateral sides. A top plate formed in a rectangular shape having vertical sides, two side walls formed by being bent along a pair of horizontal sides and extending along substantially the same direction, and intersecting with the horizontal sides The metal plate includes a bent portion along the side of the extending side wall and extending along the vertical side, the concave portion being provided in the circuit board, and the convex portion engaging with the concave portion being provided in the one portion. Electronic components featured. 4. A piece is formed as two pieces extending opposite to each other, and a step is formed on at least one of the two pieces, and two pieces are provided on the tip side of the piece from the step. The first projection is formed on one of the two pieces, and the second projection that sandwiches the circuit board with the first projection is formed on the other piece. 4. The electronic component according to claim 3, wherein: 5. A metal case having two side walls connected to the top plate and two pieces each extending from these side walls and having one end formed as an opening, and thereafter applying a force to the metal case. In this state, the metal case is deformed within the range of elastic deformation so that the opening side of the metal case is widened, and in this state, the circuit board in which the concave portion is formed in advance is inserted into the metal case from the opening side. Next, a method of assembling an electronic component, comprising releasing a force applied to a metal case to engage a protrusion provided in advance on a piece with a recess of a circuit board.