JPH08130126A - Coil bobbin for electronic equipment - Google Patents

Abstract

PURPOSE: To provide a coil bobbin for an electronic equipment capable of providing good insulation and strong fixation for windings by providing a construction capable of easily and quickly impregnating the inside of the winding deeply with an impregnant such as wax or varnish. CONSTITUTION: A coil bobbin 20 for electronic equipment comprises a winding frame 21 to wind a winding, and collars for stopping the winding provided at both the ends of the winding frame 21 (upper collar 23 and lower collar 22); moreover, the lower collar 22 is a drum-type coil bobbin on which four pendent terminals 5a... are implanted, and several lines of inlet grooves M are cut in several directions into the surfaces of the upper and lower collars 22 and 23 at the winding frame side for bringing in an impregnant from the outer edges to the winding frame 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to fixing the winding material in a coil component such as a transformer or a choke coil used in electronic equipment, and coating a wax, varnish or other impregnating agent to improve the pressure resistance. The present invention relates to the structure of a coil bobbin for electronic equipment, which is devised so that even the wound innermost winding is impregnated even in a large number.

[0002]

2. Description of the Related Art As electronic devices such as computers have become lighter, thinner, shorter, smaller, and have lower cost and higher performance in recent years, there has been a demand for miniaturization of individual electronic components mounted on a substrate. There is also a strong demand for downsizing and cost reduction of coil components such as noise filters.

In general, the coil component is wound around a coil bobbin made of a synthetic resin such as polyamide, polyimide, PBT, PET, phenol, diallyl, polyester, etc., and the coil bobbin is attached to a terminal embedded in a collar portion of the coil bobbin. It has a structure in which it is soldered.

A manufacturing process of a drum type coil bobbin and a transformer using the drum type coil bobbin will be described in detail below with reference to FIG.

First, the drum-shaped coil bobbin 10 formed by molding synthetic resin with a mold or the like is
Winding frame part 1 for winding a winding wire, and flange parts (lower flange part 2 and upper flange part 3) provided at both upper and lower ends of the winding frame part 1 to stop winding.
And a terminal 5a that hangs down from the lower collar 2,
5b is planted.

After the drum type coil bobbin 10 is mounted on the automatic winding machine, one end of the winding 8 (insulating coated conductor such as enamel copper wire or polyurethane copper wire) is twisted to the terminal 5a by the automatic winding machine. Then, a predetermined number of turns N is wound around the winding frame portion 1, and the remaining portion is cut by being twisted to the terminal 5b. This winding operation is performed for both the primary winding and the secondary winding, and the twisted portion is soldered to complete the winding process.

Next, an E-shaped core 9 having a magnetic core made of ferrite or the like and having the same shape as that of the coil bobbin 10 is formed.
The a and 9b are fitted face-to-face with each other into the core fitting hole 7 of the coil bobbin 10 to form a day-shaped closed magnetic circuit. The E-shaped cores 9a and 9b are fixed by any one of a fastener, taping, and an adhesive (not shown).

Finally, the transformer main body 11 is dipped with the terminals 5 facing upward in a wax, varnish or other filler (collectively referred to as impregnating agent 12), and the winding 8 is wound into multiple layers. To impregnate and coat (do not soak the terminal part). By this coating, the winding 8 is firmly fixed to the winding frame portion 1 and the insulating property (withstand voltage) is improved.

[0009]

However, in the method of impregnating the coil component with the above wax, varnish or other filler (immersion method), when the number of turns N of the winding wire 8 is small, the impregnating agent 12 is simply stored in the liquid reservoir. The impregnating agent can be easily spread all over the winding 8 wound around the winding frame 1 simply by immersing it. However, when the winding N is wound in several layers such that the number of turns N reaches several thousand, The impregnating agent does not reach the wound inner winding.

In this case, there is a problem that the effect of the impregnating agent such as fixing the winding 8 to the winding frame 1 and improving the pressure resistance cannot be expected.

Therefore, there is a vacuum impregnation method as a measure for sufficiently performing the above impregnation. This is to place a coil component in a vacuum state and inject the impregnating agent to impregnate it. The above problem of insufficient impregnation can be solved, but in this vacuum impregnating method, the impregnating agent adheres even to the terminals 5a. , The problem of solderability at the time of mounting (the problem of removing the excess impregnating agent coating part of the above-mentioned terminal in the later process, the limitation of wax, varnish material, etc.) remains, and the equipment dedicated to vacuum impregnation is There was a cost problem that it was newly needed.

The present invention has been made in view of the above circumstances, and the impregnating agent can be applied to the inner winding frame portion where the winding of the coil bobbin is wound by the conventional dipping method without using the above vacuum impregnation method. (EN) A coil bobbin for electronic equipment having a structure that is easily impregnated.

[0013]

According to the present invention, there is provided a coil bobbin for an electronic device, which comprises a winding frame portion for winding a winding wire and flange portions provided at both ends of the winding frame portion for stopping winding. In (1), a coil bobbin for an electronic device is provided, in which an introducing groove into which an impregnating agent enters from the outside is engraved on the winding frame side of the flange portion from the outer edge of the flange portion to the winding frame portion. (2) Further, the groove for introducing the impregnating agent reaches the winding frame portion from the outer edge of one of the flange portions, and then extends over the winding frame portion parallel to the winding shaft to reach the other flange portion, and further, the flange portion. The present invention achieves the above object by providing a coil bobbin for an electronic device, which is characterized in that the outer edge of the winding frame is engraved.

[0014]

In the present invention, since the introduction groove into which the impregnating agent enters from the outside is engraved on the winding frame side of the flange part of the coil bobbin for electronic equipment having the flange parts at both ends of the winding frame part, during impregnation The impregnating agent can easily enter the surface of the reel through the introduction groove.

Therefore, the impregnating agent that has reached the surface of the winding frame quickly progresses further from the inner side to the outer side of the wound winding while being transmitted through the winding section, so that the impregnating agent is sufficiently applied to the entire winding. Can be achieved in a short time.

When the introduction groove is also formed in the winding frame portion, the impregnating agent which has entered from the flange portion immediately reaches the center of the winding frame portion along the groove of the winding frame portion, so that the winding is wound. The degree of progress of impregnation is further accelerated as compared with the above, and sufficient impregnation is achieved.

There is no limitation on the cross-sectional shape of the above-mentioned impregnating agent introduction groove, and generally a U groove and a V groove are engraved.

Further, the number of introducing grooves is provided at least at one place on the flange portions at both ends, but it is desirable to provide at a plurality of places in order to obtain rapid impregnation. However, when a large number of introduction grooves are continuously engraved in parallel, the entire flange side of the flange is formed in a corrugated shape, and the same applies to the winding frame.

Further, the introduction groove can be installed from any position on the winding frame side of the flange portion from the outer edge of the flange portion toward the winding frame portion.

Wax, varnish, and other impregnating agents are sufficiently impregnated into the entire winding by the above-mentioned introduction groove even by the dipping method, so that the winding is fixed and the pressure resistance is improved.

[0021]

Embodiments of the present invention will be described in detail with reference to the drawings. Incidentally, the same parts as those of the above-mentioned conventional example are denoted by the same reference numerals.

FIG. 1 is a perspective view for explaining a structural example of a coil bobbin for electronic equipment according to claim 1 of the present invention, and FIG. 2 is a front view for explaining an infiltration route of an impregnating agent in the same embodiment. FIG. 3 is a perspective view for explaining another embodiment of the electronic device coil bobbin according to the first aspect. FIG. 4 is a perspective view for explaining a structural example of the electronic device coil bobbin according to claim 2, and FIG.
FIG. 6 is a perspective view of another embodiment of the electronic device coil bobbin according to claim 2;

In FIG. 1, a coil bobbin 2 for electronic equipment is used.
Reference numeral 0 has a winding frame portion 21 for winding the winding wire, and flange portions (upper flange portion 23, lower flange portion 22) provided at both ends of the winding frame portion 21 for stopping winding, and further below. The terminal 5 that hangs on the collar 22
A drum type coil bobbin in which four a ... Are planted, and in addition to the above, the lower brim portion 22 and the upper brim portion 23 are provided on the winding frame side with an impregnating agent from the outside from the outer edge to the winding frame portion 21. It is characterized in that several introduction grooves M are engraved from four sides so as to enter.

Using this electronic device coil bobbin 20,
As shown in FIG. 2, the winding 8 is wound around the winding frame 21 to form the E-shaped core 9
In the coil component 25 in which wax, varnish or other filler is impregnated by dipping after mounting a and 9b, the impregnating agent 12 is introduced from the respective introduction grooves M of the upper collar portion 23 and the lower collar portion 22 as indicated by arrows. , And reaches the winding frame 21 and quickly spreads over the entire winding 8 wound in multiple layers.

The coil bobbin 20 is made of synthetic resin such as polyamide, polyimide, phenol, diallyl, polyester, polyethylene terephthalate (PET) and polybutylene terephthalate (PBT) as in the conventional case, and the synthetic resin is formed by a mold or the like. The terminals 5a ... Are integrally formed by molding, and the introduction grooves M are simultaneously molded together with the terminals 5a.

A magnetic core (magnetic core) is fitted in the coil bobbin 20, but needless to say, an air-core coil bobbin having no magnetic core such as a choke coil other than a transformer may be used. .

The number of the introduction grooves M, which is a constituent element of the present invention, may be at least one or more, and the degree of impregnation becomes better as the number of introduction grooves becomes larger or the groove cross section becomes larger.

However, since the size of the groove cross section directly affects the strength of the coil bobbin, it is preferable to increase the number of the introduction grooves M while securing the strength of the collar portion in a small coil bobbin for electronic equipment. When the number of the introduction grooves M is increased, as shown in FIG.
Like the electronic device coil bobbin 30, the upper flange portion 33 and the lower flange portion 32 have a corrugated shape on the winding frame side.

Next, an embodiment according to claim 2 of the present invention will be described with reference to FIG.

A coil bobbin 40 for electronic equipment in FIG.
Reaches the winding groove 41 through the impregnating agent introduction groove M from the outer edge f1 of the upper collar portion 43 (above m1 portion), and then reaches the lower collar portion 42 across the winding frame portion 41 in parallel to the winding axis. (Above m2 part),
Further, it is characterized in that the lower brim portion 42 is carved up to the outer edge f2 on the winding frame side (above m3 portion).

When the introducing groove M into which the impregnating agent enters is provided up to the winding frame portion 41 as described above, the impregnating agent naturally reaches the winding frame portion 41 through the portions m1 and m3 of the introducing groove M. After that, it is apparent that the impregnation from the inner side of the winding through the m2 portion is performed very quickly.

As described above, in the coil bobbin for electronic equipment of the present invention, the impregnation of the impregnating agent provided in the flange or winding frame of the coil bobbin realizes rapid impregnation of the multi-layer winding even by impregnation by the conventional dipping method. Therefore, the insulation between the windings and between the windings and the magnetic core can be improved (improved withstand voltage) by coating with wax, varnish or other filler.

Needless to say, the introduction groove can be formed at the same time when the coil bobbin is formed by forming the introduction groove in the mold from the beginning, and can be realized at low cost.

In addition, as a reminder, the coil bobbin for electronic equipment according to the present invention can be applied to all coil bobbins having a collar portion and a winding frame portion, and is not limited to the vertical drum type coil bobbin as in the above embodiment. For example, the introduction groove M is engraved even in a horizontal bobbin coil bobbin 50 having an extremely low profile as shown in the perspective view of FIG.

In the coil bobbin 50, base portions 54 and 55 are extended to the collar portions 52 and 53 arranged at both ends of the winding frame portion 51, and terminals 56 and 57 are planted in the winding axis direction. Of course, the base portions 54 and 55 are also included as a partial modification of the collar portion in the present invention.

[0036]

Since the coil bobbin for electronic equipment according to the present invention is constructed as described above, a multi-layer coil component having a large number of turns is impregnated with wax, varnish or other impregnating agent by a conventional dipping method. Also, it has an excellent effect that the entire winding is quickly impregnated, the winding is firmly fixed to the winding frame portion, and the insulating property is improved.

[Brief description of drawings]

FIG. 1 is a perspective view for explaining a structural example of a coil bobbin for an electronic device according to claim 1 of the present invention.

FIG. 2 is a front view for explaining an infiltration route of an impregnating agent in the example.

FIG. 3 is a perspective view for explaining another embodiment of the coil bobbin for an electronic device according to claim 1;

FIG. 4 is a perspective view for explaining a structural example of an electronic device coil bobbin according to a second aspect of the present invention.

FIG. 5 is a perspective view of another embodiment of the electronic device coil bobbin according to the present invention.

FIG. 6 is a diagram for explaining a manufacturing process of a conventional drum type coil bobbin and a transformer using the same.

[Explanation of symbols]

1 Winding frame part 2, 22, 32, 42 Lower collar part 3, 23, 33, 43 Upper collar part 5a, 5b ..., 56, 57 Terminal 8 Winding 9a, 9b E-type core 10, 20, 30, 40, 50 Coil bobbin for electronic equipment 11 Transformer body 12 Impregnating agent 25 Coil parts 54, 55 Base part M introduction groove f1, f2 Outer edge of flange part

Claims (2)

[Claims] 1. A coil bobbin for an electronic device, comprising: a winding frame portion for winding a winding; and flange portions provided at both ends of the winding frame portion for stopping windings. A winding frame for the flange portion. A coil bobbin for an electronic device, characterized in that an introduction groove into which an impregnating agent enters from the outside is carved from the outer edge of the flange portion to the winding frame portion. 2. The impregnating agent introduction groove extends from the outer edge of one flange portion to the winding frame portion, and then extends over the winding frame portion parallel to the winding axis to reach the other flange portion, and further the flange portion. 2. The coil bobbin for electronic equipment according to claim 1, wherein the coil bobbin is engraved up to the outer edge of the winding frame.