JPH11186745A - Cover for attachment of large-sized part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cover for attachment which can stably attach a large- sized part to a printed circuit board without, attecting the pattern wiring of the printed circuit board and without causing the breakdown of the printed circuit board, the wire disconnection of the pattern, and the breakdown of the large-size part itself. SOLUTION: At the top of a large-size part, an upper engagement part 21 of a cover 11 for attachment is engaged with the other member in such a way as to cover the case 2, and both side faces 23 of the cover 11 for attachment are made in the shape of trapezoids where the bottom flats in contact with a printed circuit board 15 are wider than the corresponding flats 3 for the fixing of the large-size part, and the corresponding flat 3 for the fixing of the case 2 is engaged with the recess 24 at the bottom of each bottom flat 22, and at least in the recess 24, the flat 3 for fixing is put between the bottom flat 22 and the printed circuit board 15, and the large-size part is screwed to the printed circuit board 15 by a screw for fixation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting cover used for mounting large components such as a power transformer on a printed circuit board.

[0002]

2. Description of the Related Art For example, in recent years, terminal devices for use in homes, such as mobile devices, desktop devices, and wall devices, have been reduced in size.
Large components such as power transformers also need to be mounted directly on a printed circuit board on which electronic components are mounted due to installation space and other reasons.

A large-sized component of this type, for example, a power supply transformer, covers a yoke constituting the power supply transformer 1 as shown in a perspective view in FIG. 5A and a side view in FIG. 5B. A case 2 is provided on the main body, and both sides of the bottom of the case 2 are projected outward to form fixing flat portions 3, and a through hole 5 for a fixing screw 4 is formed at the center of each fixing flat portion 3. I am trying to do it. A plurality of lead pins 6 connected to a coil constituting the power transformer 1 are provided on both sides of the bottom of the power transformer 1 where the fixing flat portion 3 is not provided.
Is arranged.

Therefore, when mounting the power transformer 1 on a printed circuit board 7 on which various electronic components are mounted, a plurality of lead pins 6 are inserted into predetermined through holes 8 of the printed circuit board 7, and Inserting the fixing screw 4 into the projecting through-hole 5 of the fixing flat portion 3 through a hole (not shown) formed in the printed circuit board 7 to screw the power transformer 1 to the printed circuit board 7. Become. The lead pins 3 are soldered to lands of a predetermined wiring pattern on the printed circuit board 7.

[0005]

However, in the fixing structure shown in FIG. 5, for example, if the installer or the user accidentally drops the terminal device, the power transformer 1
With respect to the load caused by the weight of the lead pin 6, the lead pin 6
In the direction (lead arrangement direction) substantially orthogonal to the side surface direction of the lead, the fixing screw 4 fixed at one place of the fixing flat portion 3 at the center in the width direction is used. Become.

For this reason, when a load is applied, for example, in the direction of the side of the lead, the power transformer 1 becomes as shown in FIG.
There is a problem that the printed circuit board 7 is cracked at the soldered portion of the lead pin 6 and the mounting portion of the fixing screw 4 to cause a disconnection of the pattern, and a power transformer such as a disconnection of the lead pin 6 from the main body of the power transformer 1. There is a problem of itself being damaged.

As a method for solving such a problem, for example, as shown in FIG. 7, a cover 9 is provided by bending along the outer shape of the power transformer 1 at the center in the width direction also in the side surface of the lead. It is conceivable that both ends of the cover 9 are fixed to the printed circuit board 7 with fixing screws 4 as fixing flat portions 10. However, in this case, although the stability against the load in the side direction of the lead can be improved, since the fixing flat portion 10 of the cover 9 is fixed on the side surface having the lead pin, the pattern wiring is restricted, and the ideal pattern wiring is restricted. This causes a problem that a typical pattern wiring cannot be performed.

The present invention has been made in view of such a conventional problem, and has little effect on the pattern wiring of a printed circuit board when mounting a large component such as a power transformer on a printed circuit board of a terminal device. Even if a load is applied to a large component due to an impact such as a drop of the terminal device, the printed circuit board can be stably mounted without causing damage to the printed circuit board, disconnection of the pattern, and damage to the large component itself. An object of the present invention is to provide a cover for mounting a large component.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a large-sized power transformer or the like having a fixing flat portion formed on both sides of the bottom of the main body and having a through hole for a fixing screw. A mounting cover used to fix a component to a printed circuit board, wherein an upper engaging portion engages over both sides having the fixing flat portion at an upper portion of the main body of the large component; The width of the bottom flat portion, which is provided to be connected to both ends of the joint portion and is in contact with the printed circuit board, is larger than the width of the upper engagement portion. A concave portion formed on the lower surface of the bottom flat portion and engaged with the fixing flat portion on the corresponding side of the large-sized component; and in each concave portion, the concave portion communicates with the through hole formed in the corresponding fixing flat portion. So that the bottom flat part Having a screw hole formed, wherein the upper engaging portion is engaged with the upper portion of the main body of the large component, and each of the concave portions is engaged with the fixing flat portion on the corresponding side of the large component, and at least the In each recess, a fixing screw is inserted through the screw hole and the through hole so as to sandwich the fixing flat portion between the bottom flat portion and the printed circuit board, and the large-sized component is connected to the printed circuit board. It is characterized by being constituted so that it can be screwed to.

In one embodiment of the present invention, a screw hole is formed in the bottom flat portion other than the concave portion, and the mounting cover can be screwed to the printed circuit board through the screw hole. This makes it possible to attach large components to the printed circuit board more reliably.

Further, in one embodiment of the present invention, the width of the bottom flat portion is made larger than the width of the side surface of the large component having the fixing flat portion. In this way, large components can be more stably mounted on the printed circuit board.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a perspective view showing a configuration of a first embodiment of a cover for mounting a large component according to the present invention, and FIG. 2 is a perspective view showing a use mode thereof. This mounting cover 11 is used to mount the power transformer 1 having the configuration shown in FIG. 5 to a printed circuit board 15 on which a capacitor 12, a resistor 13, an IC 14, and the like are mounted.
An upper engaging portion 21 that engages with the upper portion of the case 2 over both sides having the fixing flat portion 3 of the power transformer 1, and is connected to both ends of the upper engaging portion 21, and contacts the printed circuit board 15. The bottom flat portion 22 has two trapezoidal side surfaces 23 wider than the side surface having the fixing flat portion 3 of the power transformer 1. The upper engaging portion 21, the bottom flat portion 22, and the side surface portion 23 are integrally formed by, for example, pressing a metal plate or the like. The upper engaging portion 21
In order to cover the upper part of the case 2, a bent portion 21a is formed at the end in the side direction of the lead.

The bottom flat part 22 of each side part 23 is
The power transformer 1 is formed with a bent structure, and the lower surface thereof is cut out so as to engage with the fixing flat portion 3 on the corresponding side of the power transformer 1, and the concave portion 24 is formed on the upper surface of each concave portion 24. Hole 5 formed in flat portion 3 for use
A screw hole 25 is formed so as to communicate with (see FIG. 5).
In this embodiment, the screw holes 25 formed on the upper surface of the concave portion 24 are centered, and the screw holes 2 are formed on both sides thereof.
5 is formed.

In mounting the power transformer 1 on the printed circuit board 15 as described above, first, a plurality of lead pins 6 are inserted into predetermined through holes of the printed circuit board 15 and the upper engaging portion of the mounting cover 11 is inserted. 21
Is engaged with the upper part of the case 2 of the power transformer 1, and each recess 24 is engaged with the fixing flat portion 3 on the corresponding side of the case 2. In this state, the fixing screw 26 is inserted through the through hole 5 (see FIG. 5) and the printed circuit board 15 into the screw hole 25 of the concave portion 24, and the fixing screw 26 is inserted into the other screw hole 25 through the printed circuit board 15. And insert
For example, by screwing these fixing screws 26 to nuts on the back surface of the printed circuit board 15 or screwing into female threads formed in the terminal device main body 27 for fixing the printed circuit board 15, the power transformer 1 Is screwed to the printed circuit board 15. Note that the lead pin 6
Is soldered to the land 29 of the predetermined wiring pattern 28 of the printed circuit board 15.

According to this embodiment, the upper engaging portion 21 of the mounting cover 11 is engaged with the upper part of the power transformer 1 so as to cover the case 2 extending in the lead arrangement direction. The two side surfaces 23 of the mounting cover 11 are trapezoidal in that the bottom flat portion 22 in contact with the printed circuit board 15 is wider than the side surface of the power transformer 1 in the lead arrangement direction. 24, the corresponding fixing flat portions 3 of the case 2 are engaged with each other, and each bottom flat portion 22 is screwed to the printed circuit board 15 at three positions including the concave portion 24. It can be securely fixed to the plate 15. Further, the bottom flat portion 2 in contact with the printed circuit board 15
Since 2 extends in the direction of the side surface of the lead, it hardly affects the pattern wiring. Furthermore, even if a load is applied in the side direction of the lead due to an impact such as a drop of the terminal device, the load is dispersed throughout the wide bottom flat portion 22 on the trapezoidal side surfaces 23 and does not act locally, The printed circuit board 15 does not crack at the soldered portion of the lead pin 6 or at the fixed portion of the flat bottom portion 22. Therefore, disconnection of the wiring pattern 28 and disconnection of the lead pin 6 from the power transformer 1 can be effectively prevented, and the power transformer 1 can be always maintained in a stable fixed state.

FIG. 3 is a perspective view showing a configuration of a second embodiment of a cover for mounting a large component according to the present invention, and FIG. 4 is a perspective view showing a use mode thereof. This mounting cover 31 is different from the mounting cover 11 shown in FIG.
A screw hole 25 formed in each bottom flat portion 22 is formed at one place on the upper surface of the concave portion 24.

Also in this embodiment, the wide flat bottom portion 22 of the trapezoidal side surface portions 23 is connected to the printed circuit board 15.
Can be effectively adhered and fixed, so that even if a load is applied to the side surface of the lead due to an impact such as a drop of the terminal device, the load can be dispersed. Therefore,
As in the first embodiment, the printed circuit board 1 is fixed at the soldered portions of the lead pins 6 and the fixed portions of the bottom flat portions 22.
Since no crack is generated in the power transformer 5, the disconnection of the wiring pattern 28 and the disconnection of the lead pin 6 from the power transformer 1 can be effectively prevented, and the power transformer 1 can be always maintained in a stable fixed state. Further, since the bottom flat portion 22 in contact with the printed circuit board 15 extends in the side direction of the lead, it hardly affects the pattern wiring of the printed circuit board 15. Furthermore, since one screw hole 25 may be formed in each bottom flat portion 22, there is an advantage that the number of work steps and the material cost of the fixing screw 26 to be used can be reduced.

It should be noted that the present invention is not limited to the above-described embodiment, but can be variously modified or changed. For example, the width of the bottom flat portion 22 of the trapezoidal side surface portions 23 does not necessarily need to be wider than the width of the opposing side surface of the power transformer 1, and may be wider than the width of the fixing flat portion 3 of the case 2. Good. Further, the present invention can be effectively applied not only to a power transformer but also to a cover for mounting other large components mounted on a printed circuit board.

[0019]

According to the present invention, the fixing flat portions projecting outward on both sides of the bottom of the large component are fastened together at the wide flat flat portion of the mounting cover. The large parts are mounted on the printed circuit board, so that the printed circuit board has almost no effect on the pattern wiring. Large components can be stably mounted without causing breakage, disconnection of the pattern, and damage to the large components themselves.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration of a first embodiment of a cover for mounting a large component according to the present invention.

FIG. 2 is a perspective view showing a use mode of the mounting cover shown in FIG.

FIG. 3 is a perspective view showing a configuration of a second embodiment of a cover for mounting a large component according to the present invention.

FIG. 4 is a perspective view showing a use mode of the mounting cover shown in FIG. 2;

FIG. 5 is a diagram showing an example of a conventional mounting mode of a power transformer.

FIG. 6 is a diagram for explaining a conventional problem.

FIG. 7 is a diagram showing another example of a conventional mounting mode of a power transformer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Power supply transformer 2 Case 3 Fixing flat part 4 Fixing screw 5 Through hole 6 Lead pin 11, 31 Mounting cover 15 Printed circuit board 21 Upper engaging part 21a Folding part 22 Bottom flat part 23 Side part 24 Depression 25 Screw hole 26 Fixing screw 27 Terminal device body 28 Wiring pattern 29 Land

Claims (3)

[Claims] 1. A mounting cover for fixing a large-sized component such as a power transformer having a fixing flat portion having a fixing screw through hole protruding outward on both sides of a bottom portion of a main body to a printed circuit board. In the upper part of the main body of the large component, an upper engaging portion that engages over both sides having the fixing flat portion, and is provided to be coupled to both ends of the upper engaging portion, respectively.
Two large trapezoidal side portions having a width of a bottom flat portion in contact with the printed circuit board larger than the width of the upper engagement portion; and a lower surface of the bottom flat portion of each side portion formed on the lower surface of the bottom flat portion. A recess in which the fixing flat portion on the corresponding side engages, and a screw hole formed in the bottom flat portion so as to communicate with the through hole formed in the corresponding fixing flat portion in each recess. In a state where the upper engaging portion is engaged with the upper portion of the main body of the large-sized component, and each of the concave portions is engaged with the fixing flat portion on the corresponding side of the large-sized component, the bottom portion is formed at least in each of the concave portions. A fixing screw may be inserted through the screw hole and the through hole so as to sandwich the fixing flat portion between the flat portion and the printed circuit board, and the large component may be screwed to the printed circuit board. Characterized by the configuration Mounting cover of large parts to be. 2. The mounting cover according to claim 1, wherein a screw hole is formed in the bottom flat portion other than the concave portion, and the mounting cover is screwed to the printed circuit board through the screw hole. A cover for mounting a large part, characterized in that the cover is configured to be capable of mounting. 3. The large component mounting cover according to claim 1, wherein a width of the bottom flat portion is larger than a width of a side surface of the large component having the fixing flat portion. Cover for mounting large parts.