JPH09129457A - Transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transformer for electronic devices, whose primary winding can be firmly fixed, easily insulated and protected from dust. SOLUTION: A primary bobbin 18, on which a primary coil 19 is wound, includes a flange provided with grooves 16 for guiding leads, a plurality of projections 17 perpendicular to the grooves and an insulating plate 20. The ends 21 of the primary coil 19, engaged with projections 17, are connected to leads 22. The primary bobbin is inserted into a secondary bobbin 24a, which has a flange 23 that covers the primary coil 19 and the coil ends 21 in such a manner that it is in contact with the primary bobbin 18 and projections 17 or slightly away (not more than wire size) from them. The primary and secondary bobbins are combined with an E core 37 and an I core 38 to form a transformer. According to this structure, the ends of the primary coil are easily positioned and dust is kept out of the primary bobbin by the flange 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer used in various electronic devices.

[0002]

2. Description of the Related Art A conventional technique will be described with reference to FIGS.

According to the figure, a primary coil bobbin 2 having a groove 1 in a collar and a primary coil 3 wound around it, and a secondary coil bobbin 4 having a secondary coil 5 wound around it are inserted. After mounting the insulating plate 6 on the secondary coil 5, connecting the lead wire 7 of the secondary coil 5 and the lead wire 8 and fixing them with the insulating tape 9, the insulating tube 11 is attached to the lead wire 10 of the primary coil 3. Insert it, draw it around the secondary coil 5, connect the lead wire 10 and the lead wire 12, wrap the coil sheath 13 by one or more turns and fix it, and install the E-shaped magnetic core 14 and the I-shaped magnetic core 15 into the transformer. Was composed.

[0004]

However, in the above structure, as shown in FIG. 6, the lead wire 10 of the primary coil 3 needs to be insulated by inserting the insulating tube 11, and the insulating tube 11 cannot be fixed. The lead wire 1 becomes stable, and stress is applied to the connecting portion 14 between the lead wire 10 and the lead wire 12 due to vibration, and the worker touches the insulating tube 11 in the process of moving the finished product such as packaging work.
0 is connected to the connecting portion 14 of the lead wire 12 with stress.

There is also a problem that the primary coil 3 is exposed from the groove 1 of the coil bobbin 2 on the primary side and dust is likely to enter the primary coil 3.

The present invention solves the above problems and is economical and has an economical structure that does not use an insulating tube, is inexpensive, securely fixes the lead wire of the primary coil, and prevents dust from entering the primary coil. The purpose is to provide a transformer having excellent workability and workability.

[0007]

In order to solve this problem, the transformer of the present invention is provided with a groove for drawing out a coil on the collar of the bobbin on the primary side, and at least one side of the groove is provided with a protrusion perpendicular to the groove. A primary side coil bobbin provided and a secondary side coil bobbin provided with a brim that covers the tip of the protrusion of the primary side coil bobbin so as to contact or form a gap equal to or less than the winding diameter, and a configuration incorporating a magnetic core It was done.

With this structure, the primary coil lead wire is hooked on the protrusion of the primary side bobbin and connected to the lead wire on the primary coil, whereby the lead wire can be easily positioned, and the protrusion of the primary side coil bobbin is provided. By inserting it into the coil bobbin on the secondary side that has a brim that covers the tip of the contact or makes a gap less than the winding diameter, the primary coil lead wire is securely fixed without coming off from the protrusion of the bobbin on the primary side. The primary coil has a structure in which dust does not easily enter due to the bobbin collar on the secondary side that covers the primary coil lead wire.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present invention is
A groove for drawing out a coil is provided on the flange of the primary side coil bobbin, and at least one side of the groove is provided with a protrusion perpendicular to the groove.The primary side coil bobbin comes into contact with the tip of the protrusion of the primary side coil bobbin or the primary side winding. The coil bobbin on the secondary side provided with a brim that covers the wire diameter or less is inserted, and a magnetic core is incorporated.The protrusion prevents the primary coil lead wire from coming off, and the secondary side The collar of the coil bobbin prevents dust from entering the primary coil.

According to a second aspect of the present invention, in the structure of the first aspect, a coil bobbin on the primary side around which a primary coil is wound, a lead wire connected to a lead wire of the primary coil, the lead wire and the primary wire. Side insulating coil disposed between the coil bobbins on one side, and a recess provided on the collar of the primary side coil bobbin for positioning the insulating plate, the insulating plate insulating the primary coil and the lead wire. The distance can be secured, and the insulating plate can be easily positioned by the recess provided in the collar of the coil bobbin on the primary side.

According to a third aspect of the present invention, in addition to the structure of the first aspect, a protrusion is provided on the secondary coil bobbin so as to face the collar of the secondary coil bobbin and project toward the flange. The flange and the protrusion protruding to the flange side facilitate the positioning when the primary side coil bobbin is inserted into the secondary side coil bobbin.

According to a fourth aspect of the present invention, the projections provided in the first aspect are provided on both sides of the groove for drawing out, and the lateral deviation of the drawing line is prevented.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. (Embodiment 1) FIG. 1 is an exploded perspective view of a transformer according to an embodiment of the present invention, FIG. 2 is a sectional view of the same, and FIG. 3 is a perspective view of a completed product thereof.

According to the figure, reference numeral 16a designates a collar provided on the coil bobbin 18 on the primary coil side. A groove 16 for drawing out the coil is provided, a projection 17 is provided on at least one side perpendicular to the groove 16, and a primary coil 19 is provided. After winding and attaching the insulating plate 20, the lead wire 2 of the primary coil 19
1 is hooked on the protrusion 17 and connected to the lead wire 22.

Next, the coil bobbin 18 and the protrusion 17 on the primary side
The coil bobbin 24a on the secondary side, which is provided with a brim 23 that covers the tip of the coil or a gap equal to or smaller than the winding diameter,
It is configured by incorporating an E-shaped magnetic core 37 and an I-shaped magnetic core 38. In more detail with reference to FIG. 2, the internal structure of the secondary coil bobbin 24a provided with the collar 23 is such that the secondary coil 25 is wound around the secondary coil bobbin 24a and the other insulating plate 26 is attached. After attaching and connecting the lead wire 27 and the lead wire 28 of the secondary coil 25, the coil sheath 29 is set to 1
It is fixed by winding more than one turn.

With the above construction, the coil bobbin 1 on the primary side
The lead wire 21 of the primary coil 19 is hooked on the protrusion 17 of No. 8 and connected to the lead wire 22 on the insulating plate 20, whereby the lead wire 21 can be positioned, and the tip end portion of the protrusion 17 is attached to the coil bobbin 24a on the secondary side. By providing a collar 23 that covers the primary coil 19 and the lead wire 21 so that the primary coil 1 and the lead wire 21 are in contact with each other or have a gap equal to or smaller than the winding diameter, the primary coil 1
The lead wire 21 of 9 can be securely fixed without coming off from the protrusion 17 of the coil bobbin 18 on the primary side.

This is more effective for fixing a coil having a large winding diameter and a plurality of coil lead wires.
As a result, the primary coil 19 and the lead wire 21 have a structure in which dust is unlikely to enter.

In the above-described embodiment, since the recess 32 for positioning the insulating plate 20 is provided at the tip of the flange of the coil bobbin 18 on the primary side, the insulating plate 20 larger than the width of the primary coil 19 is attached. , The insulation distance a between the primary coil 19 and the lead wire 21 (illustrated in FIG. 2)
Can be easily secured and has a structure with good workability.

Further, the collar 2 of the coil bobbin 24a on the secondary side
Since the protrusion 33 is provided horizontally on the side opposite to 3, the collar 34 of the coil bobbin 18 on the primary side contacts the protrusion 33 on one side, and the tip portion 30 of the protrusion 17 on the other side is the collar 23 of the coil bobbin 24a on the secondary side. Since the coil bobbin 18 on the primary side and the coil bobbin 24a on the secondary side can be positioned because they contact with E
It becomes easy to assemble the shape magnetic core 37 and the I-shaped magnetic core 38.

Further, the primary coil bobbin 18 is fitted with the dowel 35 fitted to the collar 23 of the secondary coil bobbin 24a, and the dowel 3 fitted to the protrusion 33 of the secondary coil bobbin 24a.
By providing 6, the E-shaped magnetic core 37 and the I-shaped magnetic core 38 can be easily assembled.

(Second Embodiment) FIG. 4 is a side view of a main part of a coil bobbin on the primary side, which is a main part of the second embodiment.
The difference from the first embodiment is that the coil bobbin 18 on the primary side is
The protrusion 17 and the protrusion 31 are provided on the collar of the
Since the lead wire 21 is passed between the lead wires 1, the lead wire 21 is less likely to be laterally displaced due to the protrusion 31.
Positioning 1 is easy.

[0022]

The transformer of the present invention having the above construction is
The primary coil lead wire is securely fixed, and the bobbin collar that covers the primary coil lead wire makes the primary coil a structure in which dust does not easily enter.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a transformer according to an embodiment of the present invention.

FIG. 2 is a sectional view of the same.

FIG. 3 is a perspective view of the same.

FIG. 4 is a side view of a coil bobbin on the primary side, which is a main part of the other embodiment.

FIG. 5 is a perspective view of a conventional transformer.

FIG. 6 is a sectional view of the same.

[Explanation of symbols]

 16 Grooves 17, 31 Protrusions 18 Primary-side coil bobbin 19 Primary coil 20 Insulation plate 21 Lead wire 22 Lead wire 23 Tsuba 24a Secondary-side coil bobbin 32 Recessed portion 33 Protrusion 37 E-shaped magnetic core 38 I-shaped magnetic core

Claims (4)

[Claims] 1. A primary side coil bobbin having a groove for drawing out a coil on a collar of the primary side coil bobbin, and a projection perpendicular to the groove on at least one side of the groove is provided at the tip of the projection of the primary side coil bobbin. Transformer incorporating a magnetic core by inserting a coil bobbin on the secondary side, which is provided with a brim that covers the contact or a gap equal to or smaller than the winding diameter of the primary side. 2. A primary-side coil bobbin around which a primary coil is wound, a lead wire connected to a lead wire of the primary coil, an insulating plate disposed between the lead wire and the primary-side coil bobbin, and The transformer according to claim 1, wherein the transformer is formed of a recess provided in a collar of the primary side coil bobbin for positioning an insulating plate. 3. The transformer according to claim 1, wherein the secondary coil bobbin is provided with a protrusion facing the flange of the secondary coil bobbin and projecting toward the flange. 4. The transformer according to claim 1, wherein protrusions perpendicular to the groove are provided on both sides of the coil lead-out groove provided on the flange of the coil bobbin on the primary side.