JP2512864Y2 - Coil bobbin - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a coil bobbin having a terminal pin protruding from a bobbin body.

[0002]

2. Description of the Related Art Generally, a coil bobbin is provided with a plurality of terminal pins protruding from a bobbin body, and the tip end of a wire wound around the bobbin body is entangled with the corresponding terminal pins and then soldered.

FIG. 7 shows a part of a conventional coil bobbin 70. In the coil bobbin 70 shown in the figure, a bobbin main body 71 is provided with a single diameter planting hole 72, and a rod-shaped terminal pin 73 is press-fitted into the planting hole 72 to fix the bobbin body 71. Then, the tip end side of the wire 74 is entwined with the entanglement portion 75 provided near the bobbin main body 71 of the terminal pin 73 and fixed (soldered) by solder dip. Reference numeral 76 is a crushing portion provided on the terminal pin 73 for preventing removal.

[0004]

By the way, in the above-mentioned conventional coil bobbin 70, after the tip end side of the wire 74 is entangled with the entanglement portion 75 of the terminal pin 73, solder dipping for fixing is performed. The synthetic resin forming the bobbin main body 71 is melted by the terminal pin 73 heated to a high temperature, and a part of the molten synthetic resin is blown out in the direction of the arrow X to cover the wire 74 and cure the synthetic resin covered. When doing so, there was a problem that the wire 74 is broken.

The present invention solves the problems existing in the prior art as described above, and an object thereof is to provide a coil bobbin which can surely prevent wire breakage during solder dipping and contribute to reduction of manufacturing defects.

[0006]

The present invention is directed to a bobbin main body 2
When the coil bobbin 1 having the terminal pin 3 protruding from the coil bobbin 1 is formed, the terminal pin 3 is provided with a wide flange portion 3c close to the bobbin main body 2.

On the other hand, the opening 4i of the planting hole 4 in which the terminal pin 3 is planted in the bobbin body 2 is provided with a recess 5 which forms a gap between the bobbin body 2 and the terminal pin 3.

[0008]

According to the coil bobbin 1 of the present invention, when the wire W entwined with the terminal pin 3 is solder-dipped, the synthetic resin of the bobbin main body 2 heated through the terminal pin 3 melts. Even if a part of the melted synthetic resin is blown to the tip side of the terminal pin 3, the blown synthetic resin is blocked by the wide collar portion 3c provided on the terminal pin 3, whereby the wire W is prevented from being broken. It Further, the blown synthetic resin collects in the concave portion 5 provided in the bobbin main body 2 to prevent further blowout to the outside.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, preferred embodiments according to the present invention will be described in detail with reference to the drawings.

First, the overall schematic structure of the coil bobbin 1 will be described with reference to FIGS. 2 and 3.

The coil bobbin 1 is provided with a bobbin main body 2 integrally formed of synthetic resin, and the bobbin main body 2 is composed of a wire winding portion 11 and a base portion 12. Further, planting holes 4 ... Are formed at six locations on the lower surface 12d of the base portion 12 in a direction substantially perpendicular to the lower surface 12d. And each planting hole 4
Terminal pins 3 are press-fitted and fixed to. In such a coil bobbin 1, a wire W is wound around a bobbin main body 2 to form a coil portion, and both tip ends of the wire W are entwined with predetermined terminal pins 3 ... And fixed (soldered) by solder dip. To do.

Next, the terminal pin 3 which constitutes an essential part of the present invention
The planting hole 4 will be specifically described with reference to FIGS. 1 and 4 to 6.

First, as shown in FIG. 1, the planting hole 4 has an original planting hole portion 21 in which the terminal pin 3 is planted, and the planting hole 4 is planted in the opening 4i facing the lower surface 12d of the base portion 12. A first recess 22 having a relatively large diameter with the hole 21 substantially at the center is formed over a predetermined axial depth. Also, the first recess 2
A second recess 23 having a diameter larger than that of the planting hole 21 and smaller than that of the first recess 22 is formed over the predetermined depth in the axial direction, with the planting hole 21 being substantially the center, from the bottom surface 22d of the second embodiment. The first concave portion 22 and the second concave portion 23 form the concave portion 5 and form a predetermined gap between the terminal pin 3 and the bobbin main body 2. In this case, the first concave portion 22 is mainly the collar portion 3 of the terminal pin 3 described later.
used for accommodating c, and second recess 23
Is mainly used to store blown synthetic resin.

On the other hand, the terminal pin 3 is integrally formed of a conductive metal, as shown in FIGS. One half of the terminal pin 3 constitutes a fixing portion 31, and the fixing portion 31 is the above-mentioned planting hole portion 2.
Press into 1. The intermediate portion of the fixed portion 31 is crushed to have a cross-shaped cross section as shown in FIG. 5 to form a crushed portion 32 for preventing removal. As described above, the cross-shaped cross section enhances the removal preventing effect. On the other hand, the other half of the terminal pin 3 constitutes the terminal portion 33, and a part of the fixing portion 31 near the fixing portion 31 forms a entwining portion 34 having a square cross section as shown in FIG.
As described above, the square section prevents the wire W from being loosened after being entangled. Furthermore, the fixing portion 31
The fixed portion 31 and the terminal portion 3 are provided at the boundary between the terminal portion 33 and the terminal portion 33.
A flange portion 3c wider than 3 is provided.

Therefore, when attaching the terminal pin 3 to the bobbin main body 2, the fixing portion 31 of the terminal pin 3 is attached to the planting hole portion 2.
1 into the first recess 2 as shown in FIG.
It should be located within 2. Further, when connecting the tip side of the wire W to the terminal pin 3, as shown by a virtual line in FIG. 1, the tip side of the wire W is entangled with the entanglement portion 34, and thereafter,
It may be fixed (soldered) with a solder dip. In this case, at the time of solder dipping, the synthetic resin in contact with the terminal pin 3 in the bobbin main body 2 may be melted by the high temperature and may be blown out to the tip end side of the terminal pin 3, but the blown out synthetic resin is prevented by the flange 3c. The movement toward the tip side is blocked and the water is stored in the second recess 23 (and the first recess 22). That is, breakage of the wire W reaching the terminal pin 3 due to blowing out is effectively prevented.

Although the embodiment has been described in detail above, the present invention is not limited to such an embodiment, and the detailed configuration, shape and the like can be arbitrarily changed without departing from the gist of the present invention. .

[0017]

As described above, in the coil bobbin according to the present invention, the terminal pin is provided with the wide brim portion which is close to the bobbin body, and the bobbin body is provided with the planting hole opening for planting the terminal pin. Since a recess is provided to form a gap between the bobbin body and the terminal pin, wire breakage due to blowing synthetic resin during solder dipping is reliably prevented,
It can greatly contribute to the reduction of manufacturing defects.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional configuration diagram showing a main part of a coil bobbin according to the present invention,

FIG. 2 is a partially sectional front view of the coil bobbin,

FIG. 3 is a partial sectional side view of the coil bobbin,

FIG. 4 is a front view of a terminal pin of the coil bobbin,

5 is a cross-sectional view taken along the line AA in FIG.

6 is a sectional view taken along line BB in FIG.

FIG. 7 is a partial cross-sectional configuration diagram showing a main part of a coil bobbin according to a conventional technique,

[Explanation of reference numerals] 1 coil bobbin 2 bobbin body 3 terminal pin 3c collar 4 planting hole 4i opening 5 recess

Claims (1)

(57) [Scope of utility model registration request] 1. A coil bobbin having a terminal pin protruding from a bobbin main body, wherein the terminal pin is provided with a wide flange portion close to the bobbin main body, and the opening portion of a planting hole in the bobbin main body where the terminal pin is planted. A coil bobbin characterized in that a recess is provided between the bobbin body and the terminal pin to form a gap.