JP3324358B2 - Printed circuit board with heat sink - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed circuit board provided with a heat sink for dissipating heat from electronic components mounted on a printed circuit board body.

[0002]

2. Description of the Related Art For example, in a motor controller, a heat radiating plate 2 is mounted on a printed circuit board main body 1 as shown in FIGS. The heat sink 2 has a downwardly curved portion 2.
a and an upwardly curved portion 2b are provided adjacent to each other, and the downwardly curved portion 2a abuts on the printed circuit board main body 1 and is fixed to the printed circuit board main body 1 with screws 3 from the lower surface side. ing. A motor drive electronic component 4 such as a transistor array is attached to a rising portion 2ah at an end of the downward curved portion 2a of the heat sink 2 by tightening a screw 5. The plurality of lead terminals 4 a of the electronic component 4 are arranged in one direction, are passed through the respective lead insertion holes 6 of the printed circuit board main body 1, and are connected to the lands 7 around them by soldering 8. . A lead terminal 10a of an electronic component 10 such as a resistor is passed through the lead insertion hole 9 in the other part of the printed circuit board main body 1, and is connected to a land portion 11 around the lead insertion hole 9 by soldering 8. ing.

In such a printed board with a heat radiating plate, an electronic component 4 is mounted on the heat radiating plate 2 in advance by tightening screws 5 so that no stress remains at the soldered portion, and the heat radiating plate 2 is attached to the printed circuit board. When the electronic component 1 is mounted on the main body 1, the lead terminal 4 a is inserted through the lead insertion hole 6.
Also, the lead terminal 10a is passed through the lead insertion hole 9, and in this state, the heat sink 2 is fixed to the printed circuit board main body 1 from the lower surface side of the printed circuit board main body 1 with the screw 3, and then the solder 8 is attached. I have.

[0004]

However, the printed circuit board with a heat sink having such a structure has the following problems.

(A) When mounting the heat sink 2, it is necessary to tighten the screws 3 from the lower surface side of the printed circuit board main body 1. At this time, the electronic components 4 and 10 are not soldered before soldering 8.
The inserted electronic component 10 may come off or fall down.

(B) Since the heat radiating plate 2 of the screw 3 tightening portion is in contact with the printed circuit board main body 1, the range in which electronic components can be mounted is narrowed.

SUMMARY OF THE INVENTION An object of the present invention is to provide a printed circuit board with a heat sink that can be attached to a printed circuit board main body without tightening screws.

Another object of the present invention is to provide a printed circuit board with a heat radiating plate which can have a wide range in which electronic components can be mounted even when a heat radiating plate is mounted.

[0009]

According to the present invention, a radiator plate is mounted on a printed circuit board main body, electronic components are mounted on the radiator plate, and lead terminals of the electronic components are passed through lead insertion holes of the printed circuit board main body. A printed circuit board with a heat sink having a structure that is connected by soldering is targeted for improvement.

In the printed circuit board with a heat radiating plate according to the present invention, the heat radiating plate is formed in a gate shape, and the locking projection at the lower end of the leg portion has a locking hole in the printed circuit board body. And is locked by being inserted into the horn.

When the locking projections at the lower ends of the legs are inserted into the locking holes of the printed circuit board and locked in this manner, the gate-shaped radiating plate is attached to the radiating plate in advance. By soldering the lead terminals of the electronic components to the printed circuit board main body, the heat sink can be fixed to the printed circuit board main body.

This eliminates the need to tighten the screws from the lower surface side of the printed circuit board body when attaching the heat sink, and eliminates the problem of detachment or falling down of the inserted electronic components.

Further, since the gate-shaped heat radiating plate is in contact with the main body of the printed circuit board at the tip of its leg, it is possible to prevent the range in which electronic components can be mounted from being narrowed.

In this case, it is preferable that the electronic component is attached to the leg of the heat sink.

When the electronic components are attached to the legs of the heat sink in this manner, the electronic components are directed downward perpendicular to the printed circuit board main body, and the lead terminals of the electronic components are passed through the lead insertion holes of the printed circuit board main body. The operation of inserting the locking projections at the lower ends of the legs into the locking holes of the printed circuit board main body can be easily and collectively performed.

Also, each lead insertion hole provided in the printed circuit board main body in accordance with the alignment direction of the lead terminals is provided as a long hole in a direction perpendicular to the alignment direction, and the locking projection of the heat sink is provided. Has a hook portion in a direction orthogonal to the longitudinal direction of the lead insertion hole, the locking hole of the printed circuit board main body is provided in a direction parallel to the long hole of the lead insertion hole, and one end of the direction is It is preferable that the other end side is a narrow portion having a width capable of locking the hook portion to the printed circuit board main body, the wide portion having a width capable of easily inserting the locking protrusion.

With such a structure, when the lead terminals of the electronic components are passed through the lead insertion holes of the printed circuit board body and the locking projections at the lower ends of the legs of the heat sink are inserted into the locking holes of the printed circuit board body, By inserting the locking projections of the radiator plate legs into the wide side of the locking holes of the printed circuit board body, the work of passing the lead terminals of the electronic components through the lead insertion holes of the printed circuit board body should be performed carefully. The operation of inserting the locking projection of the leg into the wide portion of the locking hole can be performed without any problem.
After such insertion work, by sliding the heat sink in the direction of the long hole of each lead insertion hole, the locking projection of the heat sink moves from the wide part side to the narrow part side, and the lower end of the leg part. Are locked to the printed circuit board body.

The land portion provided on the printed circuit board body corresponding to the long hole of the lead insertion hole may be provided only on one of the long holes of the lead insertion hole where the lead terminals are soldered. .

[0019]

1 (A) to 1 (D) show an embodiment of a printed circuit board with a heat sink according to the present invention.

The heat radiating plate 2 used in the printed circuit board with a heat radiating plate of this embodiment has a gate shape having a horizontal top portion 2c and legs 2d provided downward at both ends thereof. Also,
In the printed circuit board main body 1, each lead insertion hole 6 provided in accordance with the alignment direction of the lead terminals 4a of the motor driving electronic component 4 such as a transistor array is a long hole in a direction orthogonal to the alignment direction. Are provided respectively. A locking projection 1 is provided at the lower end of the gate-shaped heat sink 2.
2 are provided by integral molding. Each of the locking projections 12 has a hook portion 12 a in a direction perpendicular to the longitudinal direction of the lead insertion hole 6. Further, a pair of locking holes 13 for locking the heat radiating plate 2 is provided in the printed circuit board main body 1 so as to correspond to each leg 2 d of the gate-shaped heat radiating plate 2. The locking hole 13 is provided in a direction parallel to the long hole of the lead insertion hole 6, and one end of the locking hole 13 has a wide portion 13 a having a width into which the locking projection 12 can be easily inserted, and the other end has a hook portion 12 a. The narrow portion 13b has a width that can be locked to the printed circuit board body 1.

In the printed circuit board with a heat radiator having such a structure, the electronic component 4 is attached to one leg 2d of the heat radiator 2 in advance by tightening the screws 5. In this state, the respective lead terminals 4a of the electronic component 4 are passed through the respective lead insertion holes 6 of the printed circuit board main body 1, and the locking projections 12 at the lower ends of the legs 2d of the heat sink 2 are engaged with the locking holes 13 of the printed circuit board main body 1. By inserting the locking projection 13 of the heat sink leg 2d into the wide portion 13a of the locking hole 13 of the printed circuit board body 1 when inserting the lead terminal 4a of the electronic component 4 into the printed circuit board body 1, If the work of passing through each lead insertion hole 6 is carefully performed,
The locking projection 12 of the leg 2 d is provided on the wide portion 13 a side of the locking hole 13.
Can be performed without any problem. After such insertion work, the heat radiation plate 2 is slid in the direction of the long hole of each lead insertion hole 6 indicated by an arrow in FIG. 13 wide section 1
It moves from the 3a side to the narrow portion 13b side, and the hook portion 12a of the locking projection 12 at the lower end of the leg portion 2d is locked to the printed circuit board body 1.

The lead terminal 10a of an electronic component 10, such as a resistor, is passed through a lead insertion hole 9 in another portion of the printed circuit board body 1.

In this state, each lead terminal 4a is connected to the land portion 7 by soldering 8 on the back side of the printed circuit board main body 1, and
The lead terminal 10a is connected to the land portion 11 by soldering 8.

In this state, the heat radiating plate 2 becomes the electronic component 4
Then, the lead terminals 4a are fixed to the printed circuit board main body 1 using the connection of the solders 8 by soldering.

For this reason, it is not necessary to tighten the screws from the lower surface side of the printed circuit board main body 1 when attaching the heat radiating plate 2, and the problem of the detached or fall-down of the inserted electronic component 10 is eliminated.

Further, since the gate-shaped heat radiating plate 2 is in contact with the printed circuit board main body 1 at the tip of the leg portion 2d, it is possible to prevent the range in which electronic components can be mounted from being narrowed.

Further, as in the present embodiment, the electronic component 4 is
Of the printed circuit board body 1
, The lead terminal 4a of the electronic component 4 is passed through the lead insertion hole 6 of the printed circuit board body 1, and the locking projection 12 at the lower end of the leg 2d is inserted into the locking hole of the printed circuit board body 1. 13 can be easily and collectively performed.

FIG. 4 shows another example of the lead insertion hole 6 and the land 7 shown in FIG. 3B. In this example, the land portion 7 is one side of the lead insertion hole 6 in the longitudinal direction.
And is provided only on the side where the lead terminals are soldered .
Even in this case, the same effect as in the above example can be obtained.

Even with such a structure, the lead terminal 4a of the electronic component 4 is inserted into the lead insertion hole 6 on the side without the land portion 7.
Is inserted, and then the lead terminal 4a is moved to the side surrounded by the land 7 and soldered to the land 7, so that there is no problem. Further, in the case of this structure, the occupied area of the land portion 7 can be made smaller than that of FIG.

The locking projection 12 at the lower end of the leg 2d is provided with, for example, a spherical hook 12a at the lower end thereof. It can also be.

[0031]

In the printed circuit board with a heat radiating plate according to the present invention, the heat radiating plate is formed in a gate shape, and the locking boss at the lower end of the leg portion of the heat radiating plate has a locking hole in the printed circuit board body. In this state, the heat radiating plate can be fixed to the printed circuit board main body by soldering the lead terminals of the electronic components previously attached to the heat radiating plate to the printed circuit board main body in this state. . For this reason, it is not necessary to tighten the screws from the lower surface side of the printed circuit board body when attaching the heat sink, and it is possible to eliminate the problem of the detached or fall-down of the inserted electronic components.

Further, since the gate-shaped heat radiating plate is in contact with the main body of the printed circuit board at the tip of its leg, it is possible to prevent the range in which electronic components can be mounted from being narrowed.

Further, by mounting the electronic component on the leg of the radiator plate, the electronic component and the leg of the radiator plate are all directed downward at right angles to the printed circuit board body, and the lead terminals of the electronic component are provided. Through the lead insertion hole of the printed circuit board main body, and the operation of inserting the locking projection at the lower end of the leg portion into the locking hole of the printed circuit board main body can be easily performed collectively.

Further, each lead insertion hole provided in the printed circuit board main body in accordance with the alignment direction of the lead terminals is provided as an elongated hole in a direction perpendicular to the alignment direction, and is formed in the locking projection of the heat sink. Is provided with a hook portion in a direction perpendicular to the longitudinal direction of the lead insertion hole, the locking hole of the printed circuit board body is provided in a direction parallel to the long hole of the lead insertion hole, and one end in that direction is a locking projection. When the other end is narrow enough to hook the hook to the printed circuit board main body, the lead terminal of the electronic component is passed through the lead insertion hole of the printed circuit board main body, and the heat sink When the locking projections at the lower ends of the legs are inserted into the locking holes of the printed circuit board main body, the locking projections of the radiator plate legs are inserted into the wide portions of the locking holes of the printed circuit board main body, so that the electronic components are Plug the lead terminals of By performing the work through the lead insertion hole of the cement board body care, operation of inserting the locking projections of the legs wide portion side of the locking hole can be carried out without problems. After such insertion work, by sliding the heat sink in the direction of the long hole of each lead insertion hole, the locking projection of the heat sink moves from the wide part side to the narrow part side, and the lower end of the leg part. Can be brought into a state of being locked to the printed circuit board body.

Further, even if the land portion provided on the printed circuit board main body corresponding to the long hole of the lead insertion hole is provided only on one side of the long hole of the lead insertion hole where the lead terminal is to be soldered , Insert the lead terminal of the electronic component into the lead insertion hole on the side without the part, then move the lead terminal to the side surrounded by the land and solder it to the land, so there is no problem, This structure has the advantage that the area occupied by the land can be reduced.

[Brief description of the drawings]

FIG. 1 shows an example of an embodiment of a printed circuit board with a heat sink according to the present invention, wherein (A) is a front view, (B) is a left side view of (A), and (C) is (A). ), Right side view, (D)
3 is a bottom view of FIG.

FIG. 2 shows a radiator plate used in FIG.
(A) is a plan view, (B) is a left side view of (A), and (C) is a front view of (A).

3A is a bottom view of the printed circuit board main body used in FIG. 1, and FIG. 3B is an enlarged view of the lead insertion hole of FIG. 3A.

FIG. 4 is an enlarged view showing another example of the lead insertion hole shown in FIG. 3 (B).

5A and 5B show a conventional printed circuit board with a heat sink, wherein FIG. 5A is a front view, FIG. 5B is a left side view of FIG.
(C) is a bottom view of (A).

FIG. 6 shows a radiator plate used in FIG. 5;
(A) is a plan view, (B) is a left side view of (A), and (C) is a front view of (A).

7A is a bottom view of the printed circuit board main body used in FIG. 5, and FIG. 7B is an enlarged view of the lead insertion hole of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Printed circuit board main body 2 Heat sink 2a Downward curved part 2b Upward curved part 2c Horizontal top part 2d Leg 3 Screw 4 Electronic component 4a Lead terminal 5 Screw 6 Lead insertion hole 7 Land part 8 Solder 9 Lead insertion hole 10 Electronic component 10a Lead terminal 11 Land portion 12 Locking projection 12a Hook portion 13 Locking hole 13a Wide portion 13b Narrow portion

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H05K 7/20 H05K 1/18

Claims (2)

(57) [Claims] 1. A gate-shaped on a printed circuit board body radiator plate that
The locking projection at the lower end of the leg is inserted into the locking hole of the printed circuit board body.
The electronic component is attached to the legs of the heat sink, and the lead terminals of the electronic component are passed through the lead insertion holes of the printed circuit board main body and soldered and connected. In a printed circuit board with a heat sink, the printed circuit board is aligned with the alignment direction of the lead terminals.
Each lead insertion hole provided in the main unit is aligned in the alignment direction.
Are provided as long holes in a direction perpendicular to the hole , and the locking projections of the heat sink are in the longitudinal direction of the lead insertion holes.
And a hook portion in a direction perpendicular to the main body.
It is provided in the direction parallel to the long hole and one end of the direction
The other side is a wide portion with a width that allows easy insertion of the locking projection.
The side can lock the hook portion to the printed circuit board body
A printed circuit board with a heat sink characterized by having a narrow portion . 2. A front end corresponding to a long hole of said lead insertion hole.
The lands provided on the printed circuit board main body include the leads
Solder the lead terminal to one of the long holes of the insertion hole
2. The device according to claim 1, wherein
Radiating plate with a printed circuit board mounting.