JPH11144936A - Coil bobbin and electronic component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce thickening of a coil due to winding and facilitate insertion of a core, by chamfering a corner part of a barrier step provided on one side of a flange of a cylindrical spool and thus forming a round surface. SOLUTION: In order to prevent generation of a step between a barrier step 11 and a spool 8 of a coil bobbin 2, the corner of a corner part 13 of the barrier step 11 is chamfered. Then, a gap β between a wire 6 and the barrier step 11 is reduced to increase the contactability between the wire 6 and the barrier step 11. That is, a gap α generated in a conventional bobbin and the clearance β in this bobbin have the relation of α>β, and this clearance is reduced by chamfering. Thus, thickening due to winding can be minimized. When a core is incorporated, the core may not come into contact with the coil wire and can be easily inserted into the coil bobbin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to various power supply devices,
The present invention relates to electronic components such as a transformer and a choke coil used for video equipment, audio equipment, industrial equipment, and the like, and particularly to a coil bobbin used for these.

[0002]

2. Description of the Related Art Conventionally, in particular, electronic parts used for a charger for a mobile phone or the like have been required to be miniaturized, and they have to be designed so as to fit in a limited space.

[0003] Further, these electronic components are required to ensure safety standards such as the Electrical Appliance and Material Control Law and UL standards. Therefore, a creepage distance between conductors must be ensured.
A barrier tape having a thick polyester tape was used.

[0004] However, since cost reduction is required at the same time as downsizing of electronic components, a coil bobbin in which a bobbin winding frame is provided with a barrier step in advance is proposed in order to reduce the number of barrier tapes and the number of work steps for barrier tapes. Have been.

The coil bobbin will be described with reference to FIG. FIG. 2 is an explanatory diagram of a conventional coil bobbin. FIG. 2A is a front view of the coil bobbin and the core. FIG. 2B is a bottom view of the coil bobbin, and is a half-sectional view in which two circuits are wound for explanation. FIG. 2 (c)
FIG. 2 is a sectional view taken along the line AA in FIG.

In FIG. 2, a primary winding and a pin terminal block 3 are provided on a pin terminal block 3a side also serving as a core mounting table of the coil bobbin 2.
Pin terminals 4 for the secondary winding are arranged on the b side.

First, a wire 6 having a lead wire 5a1 at the beginning of wire winding wound around a pin terminal 4a1 is connected to a lead wire drawing groove 7a1 provided in parallel with the pin terminal 4a1.
And wound around the bobbin winding frame 8 for about 100 turns. Then, the lead wire 5a2 at the end of wire winding is wrapped around the pin terminal 4a2 through the groove 7a2 provided in parallel with the pin terminal 4a2. It becomes a winding.

Next, in order to obtain insulation between the primary winding and the secondary winding wound thereon, an insulating tape 9 made of flame-retardant polyester is wound on the primary winding for about 2 to 3T. Further, on the insulating tape 9, the wire 6 having the lead wire 5b1 at the beginning of winding of the wire wound around the pin terminal 4b1 passes through a lead wire drawing groove 7b1 provided in parallel with the pin terminal 4b1 and passes through the pin terminal 3b side. After being wound on the barrier step 11 provided on the winding frame by about 10T toward the flange 10b, the pin terminal 4 is passed through a groove 7b2 provided in parallel with the pin terminal 4b2.
wrap the lead wire 5b2 at the end of wire winding on b2
It becomes the next winding.

Next, an insulating tape of flame-retardant polyester is wound around the outermost layer of the secondary winding for about 2 to 3 T,
A coil is formed on the coil bobbin 2. Then, the core is incorporated.

Next, the center magnetic leg 1a of the core 1 is inserted from both sides of the through hole 12 provided in the winding frame 8 of the coil bobbin, and is fixed by abutting, so that it can be used as an electronic component such as a transformer and a choke coil. I have.

At this time, the wire 6 of the secondary winding wound from the pin terminal block 3b side is wound on the barrier stage 11 of the coil bobbin 2. At this time, since the corner portion 13 of the barrier step 11 is square, the adhesion of the wire 6 to the bobbin deteriorates, and as shown in FIG. A gap α is generated in the wire, and the wound wire 6 protrudes from the bobbin. That is, when the core 1 is assembled, it becomes difficult to insert the core 1 or cannot be inserted.

[0012]

That is, the coil becomes thick due to the effect of the step of the barrier step provided on the coil bobbin, and it becomes difficult to insert the core into the coil bobbin, or the conventional core cannot insert it. The problem occurs.

Accordingly, the present invention reduces the drawbacks of the coil by changing the structure of the barrier step provided in the bobbin of the coil bobbin in order to eliminate these drawbacks.
An object is to provide a coil bobbin in which a core can be easily inserted and an electronic component using the same.

[0014]

SUMMARY OF THE INVENTION The present invention eliminates a step between a barrier step provided on a bobbin of a coil bobbin and a bobbin,
A coil bobbin in which the winding is not affected by the effect of the barrier stage to reduce winding thickening and facilitate insertion of a core into a through hole of a winding frame, and an electronic component using the same.

That is, the present invention relates to an insulating material having a flange at both ends of a cylindrical winding frame, and a pin terminal at the lower end of the flange which also serves as a core mounting base having a lead wire drawing groove and a pin terminal. In the coil bobbin, a corner portion of a barrier step provided on the cylindrical winding frame toward one of the flanges is chamfered,
This is a coil bobbin having an R surface.

Further, the present invention is an electronic component using the coil bobbin.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an explanatory diagram of a coil bobbin according to an embodiment of the present invention. FIG. 1A is a front view of the coil bobbin and the core. FIG. 1B is a view showing A in FIG.
FIG. 3A is a cross-sectional view, but also shows a wire 6 of the coil for explanation.

Since the structure of the coil bobbin of the present invention shown in FIG. 1 is the same as that of the conventional coil bobbin of FIG. 2, only the differences between the coil bobbin of the present invention and the conventional coil bobbin will be described.

In FIG. 1, the coil bobbin according to the present invention is obtained by chamfering the corner 13 of the corner of the barrier step 11 so that no step is formed between the barrier step 11 and the winding frame 8 of the coil bobbin 2.

By chamfering the corners, the gap β between the wire 6 and the barrier step 11 is reduced, and the adhesion between the wire 6 and the barrier step 11 is increased. That is, the relationship α> β is established between the gap α generated in the conventional bobbin and the gap β of the bobbin of the present invention,
This gap can be kept small. This allows
The winding thickness can be reduced, and the core can be easily inserted into the coil bobbin without contacting the wire of the coil when the core is assembled.

[0022]

As described above, according to the present invention,
By chamfering the corners of the barrier step, it is possible to provide a coil bobbin capable of reducing coil thickening and facilitating insertion of a core and an electronic component using the same.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a coil bobbin according to an embodiment of the present invention. FIG. 1A is a front view of a coil bobbin and a core. FIG. 1B is a cross-sectional view taken along line AA of FIG.

FIG. 2 is an explanatory view of a conventional coil bobbin. FIG. 2 (a)
The front view of the conventional coil bobbin and core. FIG. 2 (b)
The bottom view of a coil bobbin. FIG. 2 (c) is a view of A in FIG. 2 (a).
-A sectional drawing.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Core 1a Center magnetic leg 2 Coil bobbin 3a, 3b Pin terminal block (also serving as core mounting table) 4, 4a1, 4a2, 4b1, 4b2 Pin terminal 5a1, 5a2, 5b1, 5b2 Lead wire 6 Wire 7, 7a1, 7a2, 7b1, 7b2 (lead wire lead-out) groove 8 winding frame 9 insulating tape 10a, 10b flange 11 barrier step 12 through hole 13 corner portion α, β gap

Claims (2)

[Claims] 1. A coil bobbin made of an insulating material having a flange at both ends of a cylindrical winding frame, and a pin terminal block serving also as a core mounting table having a lead wire drawing groove and a pin terminal at a lower end of the flange. A coil bobbin, wherein a corner portion of a barrier step provided on the cylindrical winding frame toward one of the flanges is chamfered to have an R surface. 2. An electronic component using the coil bobbin according to claim 1.