JPH09312221A - Coil bobbin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coil bobbin which ensures a creeping distance and has a good assembly efficiency and high reliability enough to obtain a low cost transformer. SOLUTION: The coil bobbin comprises a pin terminal-attached bobbin member 1 and fitting bobbin 11. The bobbin member 1 has grooves 8 for leading a winding from an insulator-made tubular body 3 having flanges at both ends. Pin terminal-plated parts 7 are provided at both opposed side faces of one of the flanges. The grooves 8 are disposed between the terminal planted parts 7. The bobbin 11 is fitted to the bobbin 1 and has an insulator-made tubular body 13 having flanges at both ends and protrudent parts 17 at one of the flanges which cover the pin terminal-plated parts 7 and grooves 8.

Description

Detailed Description of the Invention

[0001]

The present invention relates to various power supply devices,
The present invention relates to a coil bobbin for a transformer used in video equipment, audio equipment, industrial equipment, telephone-related equipment, and the like.

[0002]

2. Description of the Related Art As shown in FIG. 4, a conventional coil bobbin comprises a bobbin 1 with a pin terminal for winding a primary winding and a fitting side bobbin 21 for winding a secondary winding.

A bobbin 1 with a pin terminal has a rectangular core 3
It is composed of two quadrangular flanges and pin terminals 4, and is integrally molded with phenol resin or the like. Collars are provided at both ends of the winding core 3, and a plurality of pin terminal implantation portions 7 and a groove 8 for drawing out a wire therebetween are formed on both side surfaces of one of the collars. In addition, the pin terminal installation portion 7
A pin terminal 4 is planted in this.

On the other hand, the fitting-side bobbin 21 is composed of a rectangular tube-shaped winding core 23 and two quadrangular flanges provided at both ends thereof, and is integrally molded with phenol resin or the like.

Winding in the conventional coil bobbin is performed as follows using these two bobbins. First, in the bobbin 1 with a pin terminal, a wire 2 such as a copper wire is pulled out from the pin terminal 4a and wound around the winding core 3, and then the lead wire is twisted to the pin terminal 4b so that the primary winding is To do.
Next, on the bobbin 1 with a pin terminal having the winding on the primary side,
The fitting side bobbin 21 is fitted from the smaller brim side and wound around the winding core 23 of the fitting side bobbin 21, and the lead wire of the wire is opposed to the pin terminals 4a and 4b. No) and make the secondary winding.

Finally, as shown in FIG. 3, the insulating tape 5
Is applied to the winding of the fitting side bobbin, and the assembly of the conventional coil bobbin 20 is completed.

However, in such a coil bobbin, 1
The creepage distance between the secondary wire and the secondary wire can be taken only for B. Therefore, wrap the insulating tape 5 on the winding of the fitting side bobbin, or use a three-layer insulated wire on the secondary wire. There was a problem that it had to be used.

Further, since the above method must be adopted, there are problems that the number of types of parts increases, the workability of assembling is poor, and the cost is high.

[0009]

SUMMARY OF THE INVENTION The present invention solves the above problems and provides a coil bobbin that can obtain a creeping distance, has good workability in assembly, is highly reliable, and is inexpensive. The purpose is to provide.

[0010]

According to the present invention, a flange is provided at both ends of a tubular core made of an insulating material, and a plurality of pin terminal planting portions are provided on opposite side surfaces of one of the flanges. A bobbin with a pin terminal provided with a groove for drawing out a winding wire from the core between the pin terminal planting parts, and a cylindrical tubular member made of an insulating material that fits with the bobbin with the pin terminal. A coil bobbin comprising a fitting-side bobbin provided with flanges at both ends of a winding core, wherein one of the flanges of the fitting-side bobbin is provided with a protrusion that covers the pin terminal planting portion and the groove. It is a coil bobbin that does.

Since the fitting side bobbin is provided with the pin terminal planting portion and the projecting portion that covers the groove, a creeping distance between the primary side wire and the secondary side wire can be secured.

Further, it is not necessary to wind an insulating tape around the wire of the bobbin on the fitting side, or to use a separate wire such as a copper wire for the primary wire and a three-layer insulated wire for the secondary wire. , Workability is improved.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below.

FIG. 1 is a perspective view of the coil bobbin of the present invention. FIG. 2 is an exploded perspective view of the coil bobbin of the present invention. In addition, the same reference numerals are attached to the same structures as those of the conventional coil bobbin.

As shown in FIG. 2, the coil bobbin of the present invention comprises a bobbin 1 with a pin terminal for providing a primary winding and a fitting side bobbin 11 for providing a secondary winding.

The bobbin 1 with pin terminals has the same structure as the conventional one. That is, it is composed of a rectangular tube-shaped winding core 3, two quadrangular flanges and a pin terminal 4, and is integrally formed of phenol resin or the like. Collars are provided at both ends of the winding core 3, and a plurality of pin terminal implantation portions 7 and a groove 8 for drawing out a wire therebetween are formed on both side surfaces of one of the collars. Further, the pin terminal 4 is planted in the pin terminal planting portion 7.

On the other hand, the fitting side bobbin 11 is composed of a square tube-shaped winding core 13 and two quadrilateral flanges, and is integrally formed of phenol resin or the like. Collars are provided at both ends of the winding core 13, and one side of one of the collars has a protrusion 17 capable of covering the pin terminal planting portion 7 and the groove 8.
Is provided.

Winding is performed as follows using these two bobbins. First, in the bobbin 1 with a pin terminal, a wire 2 such as a copper wire is pulled out from the pin terminal 4a, and the core 3
After winding the wire, the lead wire is twisted to the pin terminal 4b, and the primary winding is performed. Next, the fitting side bobbin 11 is fitted to the bobbin 1 with a pin terminal provided with the winding on the primary side from the smaller brim side, and the winding core 13 of the fitting side bobbin 11 is fitted.
A wire such as a copper wire is wound around the wire, and the lead wire of the wire is entangled with a pin terminal (not shown) on the side facing the pin terminals 4a and 4b to form a secondary winding.

In this way, the coil bobbin 10 of the present invention as shown in FIG. 1 is obtained. In the coil bobbin of the present invention, the creepage distance between the primary wire and the secondary wire is
Therefore, the creepage distance can be secured only by the structure of the bobbin, compared with the creepage distance B of the conventional coil bobbin (see FIG. 3).

[0020]

According to the present invention, it is possible to provide a coil bobbin which can secure a creepage distance, has good assembly workability, high reliability, and an inexpensive transformer.

[Brief description of drawings]

FIG. 1 is a perspective view of a coil bobbin of the present invention.

FIG. 2 is an exploded perspective view of a coil bobbin of the present invention.

FIG. 3 is a perspective view of a conventional coil bobbin.

FIG. 4 is an exploded perspective view of a conventional coil bobbin.

[Explanation of symbols]

1 bobbin with pin terminal 2 wire 3 core (of bobbin with pin terminal) 4, 4a, 4b pin terminal 5 insulating tape 6 3-layer insulated wire 7 pin terminal installation part 8 groove 10 (of the present invention) coil bobbin 11 (this) Fitting side bobbin 13 (used for the coil bobbin of the invention) Core 17 (of the fitting side bobbin used for the coil bobbin of the present invention) 17 Projection 20 (Conventional) coil bobbin 21 (Used for conventional coil bobbin) Fitting side bobbin 23 Winding core A (in the mating side bobbin used in the conventional coil bobbin) A Creepage distance (in the coil bobbin of the present invention) B (In the conventional coil bobbin)

Claims (1)

[Claims] 1. A tubular core made of an insulating material is provided with flanges at both ends, and a plurality of pin terminal planting portions are provided on opposite side faces of one of the collars, and the pin terminal planting is provided. A bobbin with a pin terminal provided with a groove for pulling out a winding wire from the core between the parts, and a collar provided on both ends of a tubular core made of an insulating material and fitted with the bobbin with the pin terminal. A coil bobbin comprising a mating side bobbin, wherein the one of the collars of the mating side bobbin is provided with a projecting portion that covers the pin terminal implantation portion and the groove.