JP2612163B2 - Small winding parts with case - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inductance element such as a choke coil, and a small winding component such as a small transformer, and more specifically, a terminal portion is joined to a circuit board and soldered. However, the present invention relates to a so-called reflow type winding component.

2. Description of the Related Art A so-called chip-type wound component is widely known as a small-sized wound component that can be arranged on a surface of a printed circuit board or the like and directly soldered.

Such a coil-shaped winding component is mounted on a circuit board without inserting terminal pins into the circuit board, and its terminal portion is joined to a predetermined position on the circuit board surface. It is a reflow type in which terminals are soldered by applying temperature.

FIG. 4 shows a conventional example of a small transformer showing a small-sized winding component of this kind, filed by the present applicant as a patent application No. 92327 (Japanese Patent Publication No. 6-90982) in 1986.

This small transistor includes two substantially E-shaped ferrite cores 1 and 2 and a coil body 4 including a plurality of coils mounted on a cylindrical portion of a flanged bobbin 3. The core legs are joined to the bobbin 3 by inserting the central leg into the cylindrical portion of the bobbin 3, and the joint is fixed to the bobbin 3 by an adhesive.

The bobbin 3 has flanges on both sides, and a part of these flanges is thickly formed to form pin-implanted portions 3a and 3b of the terminal pins 5, and each of the implanted and fixed terminal pins 5 The coil end of the coil body 4 is fixed.

As shown, each terminal pin 5 has a rectangular shape which is bent substantially at a right angle, and has one arm portion having a pin implantation portion 3a,
It is implanted and fixed to 3b, and the other arm is almost horizontal just above the pin implants 3a and 3b.

The coil end of each coil forming the coil body 4 is tied between the base of each of the upper terminal pins 5 and the bent part, and the kinked part is fixed by soldering.

The above-mentioned coil body 4 has an insulating tape 6 around it.
The wrap is protected.

In the small transformer, the horizontal portions of the terminal pins 5 are joined to a circuit board, and the terminal pins are soldered to the circuit board by applying a predetermined temperature.

Although the solder material is provided in advance at the terminal pin position, the above-described soldering means is widely known.

"Problems to be Solved by the Invention" There is a problem that it is difficult to wind a reflow type winding part by an automatic winding machine. A series of winding operations are performed by an automatic winding machine, where the starting end is wrapped around the terminal pin, the bobbin is wound around the cylindrical part, the coil winding end is wrapped around the other terminal pin, and then the conductor is cut. In this regard, the production rate of the coil body 4 is high and advantageous.

However, as the size of the transformer becomes smaller,
Since the height (length in the vertical direction in the figure) of 3a and 3b is limited, the embedding depth of each terminal pin becomes shallow, so that these pins may come off.

Further, even if a slight external force is applied to the tip of the horizontal portion of each terminal pin 5, the external force may be applied to the pin base by leverage, and the pin base may rotate and cut the coil end.

The present invention solves the above-described problems such as disconnection of the terminal pin and disconnection of the coil end due to rotation of the terminal pin, as well as providing other electric components arranged close to each other. It is an object of the present invention to provide a small-sized wire-wound component provided with a protective cover for preventing an electric failure received from the component.

"Means for Solving the Problems" In order to achieve the above-described object, in the present invention, a bobbin having a flange on both sides of a winding tubular portion provided with a coil, and a terminal pin fixed to the flange. And a coil having a coil end secured to a terminal pin and mounted on the winding tubular portion, and a core having legs inserted into the winding tubular portion and assembled. In the above, a box-shaped case which houses the small winding parts is provided, and a cutout portion is formed in each of the opposing side surfaces of the case, while each flange of the bobbin is partially thick to form a flange outer surface. In addition to providing a pin-implanted portion of a terminal pin protrudingly formed in the pin-implanted portion position corresponding to the flange bottom surface, a fixing groove is formed along the cylinder axis direction of the winding tubular portion,
Further, the above-mentioned terminal pin is formed by bending at substantially a right angle, and one side thereof is implanted and fixed to the above-mentioned pin implanting part at right angles to the cylinder axis of the upper winding tubular part, and the other side is fixed above. A small-sized winding part with a case, wherein a small-sized winding part is mounted and fixed in a case so as to be fitted into a groove and a pin-implanted part of each bobbin flange is fitted into each notch of the case. Suggest.

[Operation] In the present invention described above, a terminal part is formed into a winding part that can be wound by an automatic winding machine, and the terminal pin is fitted into the fixing groove of the pin implanted part, so that the terminal base is a branch. The removal of the terminal pin and the cutting of the coil end caused by the rotation are reliably prevented.

Further, since the case is protected by the case, the structure is applied to the other electric components arranged close to each other, and the electric obstruction received by the electric components is prevented, and the bobbin flange is fitted into the cutout of the case. Therefore, it is advantageous for downsizing of the small-sized winding component with the case.

"Example" Next, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of a case 15, and FIG. 2 is a vertical sectional side view of a small transformer with a case provided with the case 15.

As shown in the figure, the small transformer with a case is configured by mounting a small transformer similar to the conventional example in a case 15.

Therefore, the small transformer has the same configuration as that of the above-described conventional small transformer, and thus is denoted by the same reference numeral.

The case 15 is formed of an electric insulating material such as a synthetic resin in a box shape, and has an internal space in which a small transformer similar to the conventional example can be housed.

Further, notches 15c and 15d are provided on the opposing side surfaces 15a and 15b of the case 15 as shown in the drawing, and the projecting portions 3c and 3e of the bobbin 3 become It is configured to fit into 15d.

FIG. 3 is a partially enlarged view of the small transformer. As can be seen from this figure, an overhang portion 3c is integrally formed outside the pin implantation portion 3a, and an upper portion of the overhang portion 3c (a lower portion in FIG. 2). ) Are formed with fixing grooves 3d for the terminal pins 5.

FIG. 3 shows the pin implanted portion 3a, but the other pin implanted portion 3b has the same configuration, and includes an overhang portion 3e and a fixing groove 3f.

The small transformer housed in the case 15 is integrally fixed to the case 15 by filling the inside of the case 15 with an electrical insulating material.

In the above-described small transformer with a case, even when an external force is applied to the terminal pins 5 protruding out of the case, the respective terminal pins 5 are fitted in the fixing grooves 3d and 3f. Problems such as cutting of a coil end and removal of a pin can be reliably solved.

Further, when the terminal pins 5 are soldered to the circuit board by applying a predetermined temperature, the temperature is cut off by the case 15 so that the internal small transformer is not damaged by the temperature, and furthermore, it is connected to other electric components. When closely assembled, the case 15 protects and prevents electric influence from other electric parts, and also prevents electric influence from the small transformer to other electric parts.

Further, since the pin implants 3a and 3b of the bobbin 3 are partially fitted into the cutouts 15c and 15d of the case 15, the bobbin winding area between the pin implants 3a and 3b can be widened. .

In this embodiment, the bobbin portion electrically insulates between the fixed grooves 3d and between the fixed grooves 3f, so that the case 15 can be made of a conductive material such as a metal material.

Although the embodiment of the present invention has been described above, the means for fixing the small transformer housed in the case is not limited to filling the inside of the case with an electrical insulating material, but is fixed by using an adhesive to prevent the case from coming out. In addition, fitting and fixing means, for example, the opposing side surface of the case is formed in advance so as to be slightly curved inward, so that the small transformer contained therein can be clamped by the opposing side surface to prevent slipping out.

On the other hand, each terminal pin may be bent in advance before the small transformer is housed in the case, and after the small transformer is housed in the case, each terminal pin is bent so as to fit into each of the fixing grooves. You may.

In addition, the case can be made of a magnetic material such as ferrite material, and the case configured in this way can be received from other electric parts and can prevent electromagnetic dielectric interference that may be given to other electric parts. It is advantageous.

The present invention is not limited to a small transformer, but can be similarly applied to other small winding components such as a choke coil.

"Effects of the Invention" As described above, the small winding component according to the present invention is provided with the fixing groove for fitting the terminal pin in the pin planting portion formed on the bobbin flange. It is not pushed even if it receives an external force, so that the terminal pin can be reliably prevented from being cut off due to the rotation of the base of the terminal pin and the terminal pin coming out due to the loosening of the pin embedded portion. .

Further, since the small-sized winding component according to the present invention is configured to be covered with the case, the small-sized winding component is applied to other electric components arranged close to each other, and the electric interference received from the other electric components is extremely small.

In particular, the present invention has a configuration in which the pin-implanted portion provided on the bobbin flange is fitted into the notch of the case, so that the fitted small-sized winding component can be downsized. If a case that can accommodate the small transformer of the example is used, the winding area of the bobbin can be widened by the above fitting configuration between the pin implant portion and the case, which is advantageous in increasing the efficiency of the winding component. .

[Brief description of the drawings]

1 is a perspective view of a case showing an embodiment of the present invention, FIG. 2 is a vertical sectional side view of a small transformer with a case according to the present invention, FIG. 3 is a partially enlarged perspective view of the small transformer, and FIG. FIG. 3 is a perspective view of a small transformer shown as a conventional example viewed from the bottom direction. 1, 2 ... ferrite core 3 ... bobbin 3a, 3b ... pin planting part 3d, 3f ... fixing groove 4 ... coil 5 ... terminal pin 15 ... case 15c, 15d ... notch

Claims (1)

(57) [Claims] 1. A bobbin having a flange on both sides of a winding tubular portion on which a coil is mounted, and a terminal pin fixed to the flange, and a coil end secured to a terminal pin by the coil end. In a small-sized winding component comprising a coil mounted on a shaped portion and a core assembled by inserting a leg portion into the wound tubular portion, a box-shaped case for housing the small-sized winding component is provided. In this case, a cutout portion is formed on each of the opposing side surfaces, while each of the flanges of the bobbin is provided with a pin-implanted portion of a terminal pin formed by forming a part of the flange to be thicker and protruding from the outer surface of the flange. A fixing groove is formed at the position where the pin is to be provided along the cylinder axis direction of the winding cylindrical portion, and the terminal pin is bent at substantially a right angle, and one side of the terminal pin is wound upward. At the same time as being perpendicular to the cylinder axis of the wire cylindrical portion and fixed to the above-mentioned pin planting portion, the other side portion is The small winding with the case is characterized in that the small winding parts are mounted and fixed in the case so as to be fitted in the fixing grooves, and the pin implanted portions of the bobbin flanges are fitted in the respective cutouts of the case. Wire parts.