JPH0429567Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to a heat sink for mounting on a printed circuit board, and is used in the field of manufacturing and selling electronic components.

(Prior Art) Conventionally, when a transistor or the like is incorporated into a printed circuit board, it is generally done through an aluminum heat sink (radiator) in order to dissipate the heat generated by the transistor or the like to the outside.

In the case of an aluminum heat sink, it is not possible to solder it, so the legs protruding from one side of the heat sink can be bent by penetrating the printed circuit board, or the one side of the heat sink can be made of a material that can be soldered, such as brass. By fixing pins and terminals, penetrating the pins and terminals into the printed circuit board and soldering them,
I was fixing the printed circuit board and heat sink.

(Problems to be solved by the invention) In the above structure, it is difficult to completely bend the legs, and the fixation is not reliable. The reality is that the method of providing a

However, when installing these pins and terminals on the heat sink, it was necessary to caulk the pins and the heat sink, or to fix the terminals to the heat sink via screws, which increased the number of steps, resulting in poor manufacturing efficiency and difficulty in mass production. There was a problem.

(Means for solving the problem) Therefore, this invention solves the above problem by making it possible to attach a terminal made of solderable metal to one side of the heat sink with a single touch.

That is, in the heat sink for mounting a printed circuit board of this invention, a protruding piece with two notched grooves is formed within the side edge of the fin body, and a metal terminal is formed at the base of the metal terminal that can be soldered to the protruding piece. A cylindrical portion is fitted therein, and a protrusion formed on the inner wall of the cylindrical portion is hooked into a hole provided in the protruding piece.

In order to prevent play from occurring at the fitting part between the terminal and the protrusion, for example, the cylindrical part formed at the base of the terminal should be a cylinder with a cross-section that is approximately the same as the cross-sectional shape of the protrusion, and the side wall of the cylindrical body may be It is constructed by imparting elasticity to pinch the protruding pieces.

Further, the fitting part can be fixed by hooking a protrusion formed on the inner wall of the cylindrical part on the terminal side into a hole provided in the protruding piece. If it is composed of a formed elastic piece, it will be easy to fit.
Moreover, the structure can be such that it does not easily come off after being hooked.

(Function) According to the heat sink for mounting a printed circuit board of this invention, it can be assembled by simply fitting the cylindrical part formed at the base of the terminal onto the protruding piece of the fin body, without requiring crimping or screwing work. can.
Therefore, manufacturing efficiency can be increased and mass production can be achieved.

(Example) An example of this invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 indicates a fin body made of an aluminum plate having a U-shaped cross section, and 2 indicates a terminal made of a solderable metal (for example, brass, phosphor bronze, etc.).

The terminal 2 is fixed within the lower edge of the fin main body 1 by fitting a cylindrical portion 5 on the base side into protrusions 4, 4 formed by two notch grooves 3, 3. (5th
figure).

As shown in FIGS. 2 to 4, the terminal 2 is
The cylindrical part 5 is formed at the base of a fixed piece 6 that is slightly longer than the thickness of a printed circuit board (not shown). The rising pieces 8, 8 are arranged in a row, and the folded pieces 9, 9 are arranged in a row on the inner side of the rising pieces 8, 8. The inner shape of this cylindrical portion 5 is similar to that of the protruding piece 4.
As shown in FIG. A projecting piece 4 is placed between the folded piece 9 and the base piece 7.
It is designed so that it can be pinched. Further, the end edge of the folded piece 9 is formed with an R portion 10 as shown in FIG. On the other hand, the central part of the base piece 7 is made to correspond to the square hole 11 bored in the central part of the projecting piece 4,
An elastic piece 12 is provided which is punched inward, and as shown in FIG. 5, the elastic piece 12 projects into the square hole 11 and the two pieces are engaged with each other.

The assembly of the fin main body 1 and the terminal 2 in the above embodiment will be explained as follows. That is, align the cylindrical portion 5 of the terminal 2 with the end of the protruding piece 4 of the fin main body 1,
Next, the terminal 2 is moved toward the fin main body 1 side as indicated by the arrow 13 in FIG. At the initial stage of fitting, the R portion 10 of the folded piece 9
As a result of the contact with the end edge 4a of the projecting piece 4, the folded pieces 9, 9 are spread out as they move. Therefore, when the fitting is completed, the projecting piece 4 is held between the folded piece 9 and the base piece 7 by the elasticity of the folded piece 9, and the terminals 2, 2 are prevented from wobbling.

On the other hand, during the above movement, the elastic piece 12
After coming into contact with the edge 4a of the base piece 7 and being flush with the base piece 7, it returns and enters the square hole 11 when it matches the position of the square hole 11. As a result, the edge of the elastic piece 12 and the edge of the square hole 11 are engaged, making it impossible for the terminal 2 to be removed.

As explained above, simply by fitting the terminal 2 into the protruding piece 4, the fixing of the terminal 2 to the fin main body 1 is completed.

The number of terminals 2 attached to the fin body 1 is not limited to two as in the embodiment, but may be one or three or more. The shape of the fin main body 1 can also be made into other shapes such as a flat plate shape.

(Effects of the invention) As described above, this invention has the effect of providing a heat sink with high manufacturing efficiency because assembly can be performed easily without requiring work such as caulking or screwing. Since the manufacturing efficiency is good, it is possible to reduce costs, and it can be made into an inexpensive heat sink, which has great practical effects.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view with some parts omitted of an embodiment of this invention, Fig. 2 is an enlarged front view of a terminal in the embodiment, Fig. 3 is an enlarged plan view, and Fig. 4 is an enlarged side view. FIG. 5 is a partially enlarged plan view of the embodiment. DESCRIPTION OF SYMBOLS 1...Fin body, 2...Terminal, 3...Notch groove, 4...Protrusion piece, 5...Cylindrical part, 11...Square hole,
12...Elastic piece.

Claims (1)

[Claims for Utility Model Registration] 1. A protruding piece with two notched grooves is formed in the side edge of the fin body, and a cylindrical shape formed at the base of a metal terminal that can be soldered to the protruding piece. 2. A heat sink for mounting a printed circuit board, characterized in that a protrusion formed on the inner wall of the cylindrical part is engaged with a hole provided in the protrusion. The printed circuit board mounting according to claim 1, wherein the part is composed of a cylindrical body having a cross section substantially the same as the cross-sectional shape of the protruding piece, and the side wall of the cylindrical body is given elasticity to clamp the protruding piece. Heat sink 3 The heat sink for mounting a printed circuit board according to claim 1, wherein the protrusion formed on the inner wall of the cylindrical portion is constituted by an elastic piece formed by punching out the side wall of the cylindrical body.