JP2551297Y2 - Transistor mounting holder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a transistor mounting holder for mounting a transistor mounted on a printed circuit board to a heat radiator (heat sink) for generating heat. [Technical background of the invention] Conventionally, this type of transistor mounting holder is shown in FIG.
This is shown in FIG. 7 (a) and 8 (a) are exploded perspective views, respectively, showing a state before a transistor is mounted on a heat sink. FIGS. 7 (b) and 8 (b) show a state in which the transistor is mounted on a heat sink. After attaching,
This shows a state before being put into an automatic solder tank. First, the case of FIGS. 7A and 7B will be described. In this case, as shown in FIG. 7A, the transistor 2 is attached to the heat sink 1 and the transistor 2 is mounted on the heat sink 1 by using the transistor holder 4.
And the transistor holder 4 is attached to the heat sink 1 with the screws 4a. In this way, the assembly in which the transistor 2 and the transistor holder 4 are mounted on the heat sink 1 is mounted on the printed circuit board 3 as shown in FIG. 7 (b). In this case, there is a conductive piece A of the transistor holder 4 for dropping to the ground potential from the foot of the transistor 2 and the heat sink 1 via the transistor holder 4. After the conductive piece A and the foot of the transistor 2 are inserted into the printed circuit board 3, they flow into an automatic solder tank (not shown). Also, in the case of FIG.
Then, the foot 2a of the transistor 2 is inserted and mounted, and is poured into an automatic solder bath. After the foot of the transistor 2 is soldered on the back side of the printed circuit board 2, as shown in FIG. The transistor 2 is brought into close contact, and the transistor 2 is sandwiched between the heat sink 1 and the transistor holder 4 by using the transistor holder 4, and the screws 4 a
Fix with. Further, the conductive piece A of the transistor holder 4 is soldered from the back surface of the printed circuit board 3. Next, the operation will be described. 7 (a) and 7 (b), first, the transistor 2 is attached to the heat sink 1, is securely pressed by the elastic piece B of the transistor holder 4, and is fixed by screwing with the screw 4a. And a highly reliable assembly has been completed. 8 (a) and 8 (b), first, the transistor 2 is mounted on the printed circuit board 3 and is automatically soldered. Therefore, if a large number of elastic pieces B are provided in the transistor holder 4, Even if many transistors 2 are arranged, they can be fixed to the heat sink 1. Furthermore, with the above technology, automatic soldering (injection into a solder tank) has become completely mainstream today (automatic soldering is inferior in cost compared to automatic soldering and manual soldering). Is assumed. [Problems of the Background Art] However, in the conventional transistor mounting holder, the heat sink 1 and the transistor 2 are mounted first in FIGS. 7A and 7B, so that the assembly is mounted on the printed circuit board 3. At the time of mounting, the positions of the holes 3a of the printed circuit board 3 and the feet 2a of the transistor 2 do not match. The reason is that the dimensional capability tolerance of the current transistor is ± 0.2 mm, and the dimensional capability tolerance of the heat sink is 0.1 to 0.2 m.
m, the printed circuit board has a tolerance of 0.1 mm, and although three or more transistors (three leads) are attached, mounting of the assembly is extremely difficult and is impossible in practice. Therefore, the configuration shown in FIGS. 8A and 8B may be performed. First, since the foot 2a of the transistor 2 is soldered by automatic soldering, the heat sink 1 is attached to the foot 2a, and the transistor 2 is clamped by the transistor holder 4. At this time, as shown in FIG. 6 as viewed from the arrow Y in FIG. 8B, the transistor falls down because there is no holding during mounting before automatic soldering. In addition, an external force such as vibration may cause the automatic soldering tank to fall down. When soldering is performed automatically in this state, when the transistor holder is mounted, a force is generated which causes the transistor 2 to move vertically as shown by the arrow Y2 in FIG. 6, and the force is applied to the solder of the foot 2a of the transistor 2 to form a pattern. This is a major factor that causes defects such as peeling. 8 (a) and 8 (b), as far as the transistor 2 is mounted on the printed circuit board 3, the heat sink 1 and the transistor holder 4 are attached before automatic soldering. Although it seems that there is no problem, if a large component such as the heat sink 1 is mounted first as a flow of the production method, it is impossible to insert peripheral components, resistors, capacitors, etc., or it is difficult to insert it. It is well known to mount from a small part, and even if the heat sink 1 and the transistor holder 4 are mounted after all other parts have been inserted, the other inserted parts are still soldered. Work that gives an extremely high impact, such as screwing, will cause other parts to float, etc. Because, has failed forced take the form of Figure 8. [Purpose of the Invention] This invention has been made in order to eliminate the above-mentioned conventional drawbacks, and at the same time, allows the transistor holder to be self-supporting on the substrate, and at the same time, securely holds the transistor vertically, and also has a soldered transistor holder. It is an object of the present invention to provide a transistor mounting holder capable of obtaining a sufficient strength even when screwed down with the foot. [Outline of the Invention] The transistor mounting holder of the present invention is a transistor mounting holder that holds the transistor mounted on the printed circuit board and holds the transistor in close contact with the heat radiator by attaching the transistor to the heat radiator. A solderable leg, an elastically deformable piece for holding the transistor in a predetermined posture before soldering when inserted into a printed circuit board, and a mounting portion for mounting to a heat radiator. Wherein the transistor is closely attached to the heat radiator when attached to the heat radiator. Embodiment of the Invention Hereinafter, an embodiment of the transistor mounting holder of the invention will be described with reference to the drawings. FIG. 1 (a) is a front view of one embodiment, and FIG. 1 (b).
1 is a plan view of FIG. 1 (a), and FIG. 1 (c) is FIG. 1 (a).
FIG. 2 is an enlarged perspective view showing a part of a transistor mounting holder taken out, and FIG. 3 is a circle B in FIG.
It is an enlarged view of the part. In FIGS. 1 (a) to 1 (c), 2 and 3, the transistor mounting holder 11 is formed of a metal plate having good solderability and good elastic deformation.
A plurality of elastically deformable pieces b are provided near the lower end. As apparent from FIGS. 2 and 3, this elastically deformable piece b is for holding the transistor 2, and can be opened and closed in the direction of arrow Y1 in FIG. As shown in the figure, four elastic deformation pieces b are provided for each pair of left and right sides, but the number is not particularly limited. The elastically deformable piece b is, as apparent from FIG.
Each pair is formed in a “<” shape, and each holds a transistor between two elastically deformable pieces b. Further, on the lower end edge of the transistor mounting holder 11, legs 11A are integrally provided at both ends and an intermediate portion thereof. The feet 11A are adapted to be inserted into holes formed in the printed circuit board. The foot 11A has such a size as to prevent external force on the foot of the transistor after the automatic soldering. This foot 11A
It is soldered at the same time as the foot of the transistor in the automatic soldering tank. Next, the operation of the present invention will be described. As shown in FIG. 4 (b), the foot 2a of the transistor 2 is inserted into the hole 3a of the printed circuit board 3, and therefrom FIG.
Using the transistor mounting holder 11 shown in FIG. 1 (c), FIG. 2 and FIG.
Insert After that, as shown in FIG. 4 (a), the transistor 2 is pushed into and held between the pair of elastically deformed pieces b of the pair of transistor mounting holders 11, each of which is formed in a "" shape. When the transistor mounting holder 11 is sent to the automatic soldering tank together with the printed circuit board 3 while the transistor 2 is held by the elastically deformable pieces b of the transistor mounting holder 11 in this manner, the transistor 2 is transferred to the transistor mounting holder 11.
Thus, the legs 2a of the transistor 2 and the legs 11A of the transistor mounting holder 11 are simultaneously soldered while being held vertically. Thereafter, as shown in FIG. 5, the heat sink 1 (1A indicates a hole) is brought into close contact with the surface of the transistor 2 and fixed by screws 4a. At this time, when the heat sink 1 comes into contact with the elastically deformable pieces b shown in FIGS. 1A to 1C, the heat sink 1 cannot be brought into close contact with the transistor surface. Therefore, a hole 1A is made to escape this. Further, the elastically deformable piece a of the transistor mounting holder 11 provided at the position as shown in FIG. 3 is deformed by screwing, and the close contact between the transistor surface and the heat sink 1 surface is ensured. In addition, external forces such as vibration and torque at the time of screwing are also applied to the feet 11A of the transistor mounting holder 11 because the feet 11A of the transistor mounting holder 11 are soldered over a large area.
The force is dispersed in the direction of A, and the foot 2a of the transistor 2 is protected. In the above-described embodiment, the heat sink 1 is provided just to stimulate the heat generated by the transistor 2. However, for example, when heat radiation of the transistor is required from a structural member such as a chassis (steel plate) or a rear panel of a general electric product. If this transistor mounting holder 11 is used, it is possible to radiate heat to the structural members without difficulty by assembling the chassis. [Effects of the Invention] As described above, according to the transistor mounting holder of the present invention, the transistor mounting holder can be self-supported on the printed circuit board, and after the transistor is mounted on the substrate, the elastic deformation piece that can be vertically held is provided. Since the foot of the transistor mounting holder can be soldered to the printed circuit board, a highly reliable assembly can be performed without applying a load to the foot of the transistor even if a heat sink is attached after soldering. Also, when a large number of transistors are attached to one heat sink, a large number of elastically deformable pieces may be provided, so that the attachment can be performed with high reliability and efficiency.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 (a) is a front view of an embodiment of the transistor mounting holder of the present invention, FIG. 1 (b) is a plan view of FIG. 1 (a), and FIG. ) Is a side view of FIG. 1 (a), FIG. 2 is a perspective view showing an essential part of the transistor mounting holder, and FIG. 3 is an enlarged perspective view of a circle B in FIG. 2, and FIG. (A) and FIGS. 4 (b) and 5 are diagrams for explaining a process of mounting the transistor mounting holder to the heat sink, respectively, and FIGS. 6, 7 (a) and 7 (b). 8 (a) and 8 (b) are views for explaining a conventional process of mounting a transistor mounting holder to a heat sink. 1 ... heat sink 2 ... transistor 2a ... transistor foot 3 ... printed circuit board 3a, 3A ... printed circuit board hole 4a ... screw 11 ... transistor mounting holder 11A ... ... transistor mounting holder foot b ... elasticity Deformed piece

Claims (1)

(57) [Rules for requesting registration of utility model] A transistor mounting holder for holding a transistor mounted on a printed circuit board and holding the transistor in close contact with the heat radiator by attaching the transistor to the heat radiator, wherein the solderable leg inserted into the printed circuit board; An elastically deformable piece for holding the transistor in a predetermined posture before soldering in a state where the transistor is inserted into a printed circuit board; and an attaching portion for attaching to the radiator. Wherein the transistor is closely held by the heat radiator when the transistor is mounted.