JP2507492Y2 - 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 a coil bobbin having a cylindrical bobbin body and lead terminal portions projecting parallel to the tangent line of the outer peripheral surface and arranged in a line parallel to the axis of the bobbin body. .

[0002]

2. Description of the Related Art Conventionally, a small-diameter inner bobbin portion formed in a tubular shape and a large-diameter outer bobbin portion formed in a tubular shape and having a receiving hole for accommodating the inner bobbin portion in the center thereof have a tubular shape as a whole. A coil bobbin for a transformer is known which is configured to form a bobbin main body, and which has lead terminal portions which project in parallel with a tangent line of an outer peripheral surface of the bobbin main body and are arranged in a line parallel to an axis of the bobbin main body. There is.

However, in the conventional coil bobbin, the lead terminals are arranged in a line parallel to the axis of the bobbin main body, so the transformer manufactured by such a coil bobbin is inserted into the connection hole of the printed board. In this case, there is a problem that the lead terminal part easily swings to the left and right and becomes unstable, and there is a problem that the transformer floats from the printed circuit board during the vibration and swing from the insert process to the solder dip process, and further during the solder dip process. . In particular, when it is necessary to accurately position and mount the transformer due to the relationship with other components, even a small amount of lift causes a board defect, which is a serious problem.

The present invention solves the problems existing in the prior art as described above, and an object thereof is to provide a coil bobbin capable of surely preventing the transformer from rising from the printed circuit board and performing accurate positioning. To do.

[0005]

DISCLOSURE OF THE INVENTION According to the present invention, a lead is provided on a cylindrical bobbin main body 2 so as to project in parallel with a tangent line K1 of an outer peripheral surface thereof and arranged in parallel with an axis K2 of the bobbin main body 2. When constructing the coil bobbin 1 including the terminal portions 3x and 4x , the lead terminal portions 3x and 4x are connected to the bobbin.
Offset from the center position K0 of the body 2 by a predetermined width H1
The lead terminal 3 is provided on the bobbin main body 2 as well.
x, arranged parallel to 4x, and inserted into the locking hole Bc of the printed circuit board B and lockable fixation claw portions 5 and 6, Li
It is a predetermined width H2 more than the positions of the terminals 3x and 4x.
It is characterized in that it is provided with an offset in the direction away from the center position K0 .

In this case, the fixed claw portion 5 (same for the 6 side) includes an elastic piece portion 5e parallel to the lead terminal portion 3x and a claw body portion 5b provided at the tip of the elastic piece portion 5e. 5
b can be configured by providing an inclined surface portion 5s whose tip side is gradually narrowed and an engaging surface portion 5c which faces the elastic piece portion 5e at a right angle and is provided on the opposite side to the lead terminal portion 3x.

[0007]

According to the coil bobbin 1 of the present invention, by inserting the lead terminal portions 3x and 4x of the bobbin main body 2 into the connection hole Bh of the printed board B, at the same time, the lead terminal portions 3x and 4x are parallel to the lead terminal portions 3x and 4x. The fixed claws 5 and 6 thus arranged are also inserted into the locking holes Bc of the printed circuit board B, and the fixed claws 5 and 6 are locked in the locking holes Bc. That is, the fixed claw portion 5
(6 side is also the same) when the elastic piece 5 is inserted into the locking hole Bc.
Due to the elasticity of e, the claw main body 5b is displaced inward, the claw main body 5b returns to the original position in the completely inserted state, and the locking surface 5c is locked to the lower surface of the printed circuit board B. As a result, the lead terminal portion 3 from the printed circuit board B
x, 4x is prevented from rising.

[0008] The lead terminal portion 3x, with 4x is provided offset from the central position K0 of the bobbin main body 2 by a predetermined value H1, fixing claw portions 5 and 6 lead terminal portion 3x ...
Since the fixed claw portion 5 is provided by being offset by a predetermined width H2 in the direction away from the center position K0.
As the fulcrum, is urged in the direction of the lead terminal portion 3x ... are inserted into the connecting hole Bh by transfection of its own weight,
Accurate positioning is achieved by improving the positional accuracy on mounting.

[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 structure of the coil bobbin 1 according to the present invention will be described with reference to FIGS.

As shown in FIG. 2, the coil bobbin 1 is formed in a tubular shape with an inner bobbin portion 11 having a tubular shape and having a small diameter.
Further, the bobbin main body 2 has a cylindrical shape as a whole and includes a large-diameter outer bobbin portion 12 having a housing hole 12h for housing the inner bobbin portion 11.

The inner bobbin portion 11 is integrally formed of an insulating material and has a winding mounting portion 13 on the outer peripheral surface. Further, one end of the inner bobbin portion 11 is integrally provided with an elastic claw portion 14 projecting outward in the axial direction, and the claw portion 14 is provided on the outer bobbin portion 12.
Lock at one end of. On the other hand, the base portion 15 is integrally provided at the other end of the inner bobbin portion 11. The base portion 15 projects outward in the axial direction and is provided over the circumferential half portion. A part of the base portion 15 constitutes a locked portion 16, and the locked portion 16
Is a pair of spaced apart locked surfaces 16 that are parallel to the axis K2.
r, 16s. Further, the base portion 15 has four protruding portions 17 ... Which protrude outward in the radial direction, and thereby constitutes a flange portion 18 that is locked to the other end of the outer bobbin portion 12. Furthermore, four terminal pins 19, which project in the axial direction, are integrally attached to the protrusions 17 by insert molding or the like.

On the other hand, the outer bobbin portion 12 is also integrally formed of an insulating material, and has a plurality of concave groove-shaped winding mounting portions 22 ... Partitioned by a plurality of partitioning ribs 21. Further, the other end of the outer bobbin portion 12 has a locking portion 2 that projects outward in the axial direction.
3 is provided. The locking portion 23 has a pair of locking surfaces 23r and 23s facing the locked surfaces 16r and 16s, respectively, and when the inner bobbin portion 11 is accommodated in the outer bobbin portion 12, the locked surfaces 16r and 16s. And the locking surfaces 23r and 23s face each other in the circumferential direction and are locked together (see FIG. 3).

On the other hand, base portions 24 and 25 are provided at one end and the other end of the outer bobbin portion 12, respectively. In addition, the base parts 24 and 25
Is provided with terminal pin mounting holes 26, 27 parallel to the tangent line K1 of the outer peripheral surface of the outer bobbin portion 12, and the L-shaped terminal pin 3,
Install by press-fitting 4. The terminal pins 3 and 4 are press-fitted directly into the terminal pin mounting holes 26 and 27, and the binding terminal portions 3y and 4y for binding the wire of the winding and the binding terminal portions 3y and 4y.
Of the lead terminals 3x and 4x for bending at right angles from one end and mounting on the printed circuit board B.

As a result, the lead terminal portions 3x, 4x project in parallel to the tangent line K1 of the outer peripheral surface of the bobbin body 2 (outer bobbin portion 12) and the center position K0 of the bobbin body 2 as shown in FIG. It is offset by a predetermined width H1 from and is arranged on a line parallel to the axis K2 of the bobbin body 2 as shown in FIG.

Further, fixed claw portions 5 and 6 which are parallel to the lead terminal portions 3x and 4x are integrally provided near the terminal pins 3 and 4 in the base portions 24 and 25. in this case,
As shown in FIG. 1, the fixed claw portions 5 ... Lead terminal portions 3x.
Of the center position K0 by a predetermined width H2.
Offset in the direction away from. The fixed claw portion 5 (same for the 6 side) includes an elastic piece portion 5e parallel to the lead terminal portion 3x and a claw body portion 5 provided at the tip of the elastic piece portion 5e.
and a locking surface portion 5c formed on the opposite side to the lead terminal portion 3x, and the inclined surface portion 5s of the claw main body portion 5b, the tip side of which gradually narrows, and the elastic piece portion 5e.
Have.

Next, a method of manufacturing a transformer using the coil bobbin 1 according to the present invention and a method of mounting it on the printed board B will be described with reference to the drawings.

First, the primary winding N1 (low voltage side) is wound around the winding mounting portion 13 of the inner bobbin portion 11, and both ends of the wire are entwined with the terminal pins 19 and soldered. On the other hand, the secondary winding N2 (high-voltage side) is wound around the winding mounting portion 22 of the outer bobbin portion 12, and the wire at one end is the entangled terminal portion 3 of the one terminal pin 3.
The other end wire is entangled and soldered, and the other end wire is entangled and soldered to the entangled terminal portion 4y of the other terminal pin 4.

Then, the inner bobbin portion 11 is inserted from the claw portion 14 side into the accommodation hole 12h of the outer bobbin portion 12. At this time, the pawl portion 14 is elastically displaced inwardly when inserted, and if the inner bobbin portion 11 is completely accommodated in the accommodation hole 12h, it returns to its original position and is locked at one end of the outer bobbin portion 12. Along with
The flange portion 18 provided on the other end of the inner bobbin portion 11 is locked to the other end of the outer bobbin portion 12. In addition, the pair of engaged surfaces 16 of the engaged portion 16 provided at the other end of the inner bobbin portion 11
r and 16s are locking portions 2 provided at the other end of the outer bobbin portion 12.
The pair of locking surfaces 23r and 23s in 3 are interlocked with each other (see FIG. 3). As a result, the inner bobbin portion 11 and the outer bobbin portion 12 are fixed in the axial direction and the circumferential direction, and the both are integrated. As a result, the assembly of the transformer T shown in FIG. 2 is completed.

On the other hand, the transformer T is mounted on the printed circuit board B as shown in FIG. That is, printed circuit board B
Has a connection hole Bh into which the lead terminal portion 3x (the same applies to the 4x side) and a locking hole Bc are formed in the vicinity thereof, and the lead terminal portion 3x of the transformer T is connected from the direction of arrow F in the figure at the time of insertion. If it is inserted into the hole Bh, the fixed claw portion 5
(Same for 6 side) is also inserted into the locking hole Bc at the same time. In this case, the fixed claw portion 5 has the elastic piece portion 5 when it is inserted into the locking hole Bc.
Due to the elasticity of e, the claw main body 5b is displaced inward, the claw main body 5b returns to the original position in the completely inserted state, and the locking surface 5c is locked to the lower surface of the printed circuit board B.

By the way, since the lead terminal portions 3x are provided offset from the center position K0 of the bobbin main body 2 by a predetermined width H1, the lead terminal portions 3x are used as fulcrums until the process shifts from the insert process to the solder dipping process. There is a possibility that the transformer T easily swings to the left and right and becomes unstable, and the transformer T may be lifted from the printed circuit board due to vibration or swing. However, the fixed claw portions 5 ...
Further, since it is provided so as to be offset by a predetermined width H2 in the direction away from the center position K0, the fixed claw portions 5 that engage with the lower surface of the printed circuit board B serve as fulcrums, and the lead terminal portions 3x. The lead terminals 3x and 4x are reliably prevented from rising from the printed circuit board B by being biased in the inserting direction, and the transformer T is accurately positioned.

The embodiment has been described in detail above.
The present invention is not limited to such an embodiment.
For example, although the transformer has been illustrated as the use of the coil bobbin, the coil bobbin can be applied to any coil. Other details,
The shape, quantity, etc. can be arbitrarily changed without departing from the gist of the present invention.

[0023]

As described above, in the coil bobbin according to the present invention, the lead terminal portions are arranged on the cylindrical bobbin body so as to project in parallel to the tangent line of the outer peripheral surface and to be arranged in a line parallel to the axis. Equipped with this lead terminal inside the bobbin body.
Offset from the center position by a predetermined width, and
On the bobbin body, place it parallel to the lead terminal,
In addition, insert the fixing claw that can be inserted and locked in the locking hole of the printed circuit board by a specified width further than the position of the lead terminal.
Since it is provided with an offset in the direction away from the center position, it is possible to reliably prevent the transformer from rising from the printed circuit board and perform accurate positioning, and it is possible to drastically reduce board defects based on this. Has a great effect.

[Brief description of drawings]

FIG. 1 is a front view of a transformer mounted with a coil bobbin according to the present invention mounted on a printed circuit board;

FIG. 2 is a cross-sectional view of the transformer seen from the bottom surface direction.

FIG. 3 is a sectional view taken along line AA in FIG. 2;

FIG. 4 is a side view of an outer bobbin portion of the coil bobbin,

[Explanation of symbols]

 1 coil bobbin 2 bobbin body 3x lead terminal part 4x lead terminal part 5 fixed claw part 5e elastic piece part 5b claw body part 5s inclined surface part 5c locking surface part 6 fixed claw part K0 center position K1 tangent line K2 axis line B printed circuit board Bc locking hole

Claims (2)

(57) [Scope of utility model registration request] To 1. A cylindrical bobbin body, protrude parallel to a tangent of the outer peripheral surface, and the bobbin having a lead terminal portion which are arranged on a parallel clear distinction to the axis of the bobbin body, the lead terminal portion The center position of the bobbin body
Offset by a specified width from the
A fixing claw portion, which is arranged parallel to the lead terminal portion on the main body of the bin and can be inserted into and locked in the locking hole of the printed circuit board, has a predetermined width larger than the position of the lead terminal portion.
A coil bobbin provided by being offset in a direction away from the center position . 2. The fixed claw portion includes an elastic piece portion parallel to the lead terminal portion and a claw body portion provided at a tip of the elastic piece portion,
2. The claw main body portion has an inclined surface portion whose tip side is gradually narrowed and an engaging surface portion which faces the elastic piece at a right angle and is provided on the opposite side to the lead terminal portion. Coil bobbin.