JPH0115179Y2 - - Google Patents

Description

[Detailed description of the invention] Technical field This invention relates to the molding process of leads for shaft-shaped electronic components, particularly DHD type diodes, resistors, tubular type capacitors, etc.

BACKGROUND ART Conventionally, in many shaft-shaped electronic components, leads are generally led out from both ends of a cylindrical component body.
That is, taking a DHD type diode as an example, the explanation will be as follows. In other words, a DHD type diode has a semiconductor pellet 1 which is approximately dice-shaped and has a bump structure on at least one electrode, and a slug part 2 which serves as an lead conductor and a heat sink block.
A pair of slug leads 4 consisting of a slug part 2 and an elongated external lead-out lead 3 are prepared, and the pellet 1 is held between the slug parts 2 and 2 and stored in a cylindrical glass bulb 5 serving as an envelope. The inner wall of the glass bulb 5 and the outer wall of the slugs 2 are welded and sealed by heating the glass bulb 5 to its softening point. When the completed DHD type diode 6 having the above structure is to be fixed to a printed circuit board 7, etc., as shown in FIG. In many cases, the external lead-out leads 3, 3 are also bent and deformed, and inserted into the insertion holes 9, 9 of the printed circuit board 7, and fixed with solders 10, 10.
In this way, as shown in Figure 3, a large number of
By taping the DHD type diodes 6, 6, . . . at predetermined intervals and the leads 3, 3, .

By the way, as mentioned above, in order to automatically insert the DHD type diodes 6, 6, . Keep it
Insertion height positioning is being performed. That is, the fourth
As shown in the figure, the base 13 of the lead 3 of the DHD type diode 6 to the diode body 8 is chucked with a tool, and the lead 3 is sandwiched between the molding convex mold 14 and the molding concave mold 15 at a predetermined position. A kink formed portion 12 is formed. However, in this kink forming operation, the lead 3 cannot be kink-formed unless it is struck very steeply by the forming convex die 14 and the forming concave die 15. A large impact is applied to the lead-out end of the main body 8, causing a crack to the glass bulb 5 of the diode main body 8.
6. There was a problem that caused...

DISCLOSURE OF THE INVENTION The purpose of this invention is to prevent cracks in the kink forming of leads in the conventional DHD type diodes and the like.

The structure of this invention is to form a preforming part near the component body side of the kink molding part when performing kink molding on the lead of a shaft-shaped electronic component.

Therefore, the effects of this invention are not only that it is possible to prevent cracks in the main body of the part due to kink forming, but also that by forming a preforming part, it is possible to form with more precision than conventional kink forming. It has some advantages.

BEST MODE FOR CARRYING OUT THE INVENTION Fig. 5 is a front view of a DHD type diode standing upright showing an embodiment of the invention, and is the same as Figs. 2 and 3 showing the conventional example. Figure numbers are indicated by the same names. Furthermore, in Figure 5, 17
is a preformed part formed near the diode body 8 side of the kink molded part 12 of one lead 3, and the molded size is a fraction smaller than that of the kink molded part 12, for example, as follows. It can be provided as follows. That is, in the same manner as in the conventional case shown in FIG.
A punch upper mold 19 with a molding size shape of a fraction of 4,
It is prepared separately and closer to the main body 8 than the convex mold 14. Next, the concave mold 20 for kink forming is also connected to the convex mold 14.
In addition to the molding recess 21 corresponding to the punch upper die 19, a minute depression 22 corresponding to the punch upper mold 19 is provided. Then, before kink forming, as shown in FIG.
7 is left in place, and then kink molding is performed using the convex mold 14 and the concave portion 21 in the same manner as in the prior art. Therefore, in this embodiment, the punch upper mold 19 and the recess 22 are already formed at the time of kink forming.
Since the lead 3 is fixed by the convex shape 14
The base 1 of the reed 3 is also affected by the steep slam of the
3 and the diode main body 8, and the occurrence of cracks can be prevented.
Further, in this embodiment, since the lead 3 is fixed to the punch upper die 19 and the recess 22 in the vicinity thereof immediately before kink forming, the forming accuracy is better than that of the conventional method.

Incidentally, in the above embodiment, the preforming section 17
A depression 22 was provided in the concave mold 20 to form a
This is not necessarily necessary, and if the punch upper die 19 is sufficiently strong, it may be flattened and the area to be preformed may be crushed and formed by the punch upper die 19.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a DHD type diode, which is one of the shaft-shaped electronic components, Figure 2 is a side view of the DHD type diode when it is fixed vertically to a printed circuit board, etc., and Figure 3 is the DHD type diode. Fig. 4 is a conceptual diagram for explaining the kink forming process, and Fig. 5 is a side view showing a taped state, and Fig. 5 is a shaft-shaped electronic component (DHD type diode) showing an embodiment of this invention.
6 and 7 are conceptual diagrams for explaining the state before and after preforming. 3... Lead, 8... Part body, 12... Kink forming part, 17... Preforming part.

Claims (1)

[Scope of utility model registration request] The lead led out from the component body in the axial direction,
What is claimed is: 1. A shaft-shaped electronic component forming a kink-formed part for component insertion and positioning, characterized in that a pre-forming part is formed in the vicinity of the component body side of the kink-formed part of the lead.