JPH0831674A - Flyback transformer - Google Patents

Abstract

PURPOSE:To secure a connecting tube to connect an anode lead wire and thus prevent disconnection and resin leakage, by molding the connecting tube and an insulating case into one piece. CONSTITUTION:An insulating case 5 has a cylindrical connecting tube 5b formed inside it, into which an anode lead wire 1 to take d.c. high voltage is to be inserted. The connecting tube 5b is integrally molded so that its upper end will be shared with the body 5a of the insulating case 5. Also, a securing plate 5d coupling the connecting tube 5b with the insulating case body 5a, is integrally molded to secure the side of the connecting tube 5b on the insulating case body 5a. This prevents disconnection and short circuits in a lead wire connecting to a connecting means, and eliminate the leakage of insulating resin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flyback transformer, and more particularly to a flyback transformer characterized by the structure of a connecting cylinder for connecting anodic lead wires provided in an insulating case.

[0002]

2. Description of the Related Art The structure of a conventional flyback transformer 50 will be described with reference to FIGS. FIG. 5 is an external perspective view of a conventional flyback transformer 50. An anode lead wire 1, a ferrite core 2, a focus pack 3 and the like include a low voltage coil (not shown), a high voltage coil (not shown) and a high voltage coil. The structure is such that it is attached to an insulating case 5 in which a diode (not shown) is housed.

FIG. 6 is a partial cross-sectional view of the flyback transformer 50 showing the connection state of the anode lead wire 1. Figure 6
In the figure, reference numeral 1 denotes an anodic wire, one end of which passes through the inside of the connecting tube 5b and the connecting means 6 provided at the lower end of the connecting tube 5b.
The anode cap 4 provided at the other end is connected to a cathode ray tube (not shown) so that the high-voltage pulse power generated by the flyback transformer 50 is applied. The high-voltage pulse power is additionally rectified by a plurality of high-voltage coils and a plurality of high-voltage diodes, and is generated at the terminal of the highest-voltage high-voltage diode 7. The high voltage diode 7 is connected to the connecting means 6 by a lead wire 10. The upper end of the connecting tube 5b is fitted into the connecting port 5e provided in the insulating case body 5a, and the lower end is fixed by being attached to the connecting portion 5f on the side surface of the high voltage coil bobbin 8. A lid portion 5c is provided on the upper end of the connecting tube 5b so as to hold the anode wire 1 therein. The connecting means 6 is formed of a conductive elastic material such as rubber or a metal clip so that the anode wire 1 can be securely connected only by inserting it from the upper end of the connecting tube 5b.

The flyback transformer 50 can be manufactured by the following steps. First, the high-voltage coil bobbin 8 in which the high-voltage coil is separately wound and a plurality of high-voltage diodes are mounted is mounted in the low-voltage coil bobbin 9 in which the low-voltage coil is wound. Next, the connecting cylinder 5b having the connecting means 6 for connecting the anode wire 1 is attached to the high voltage coil bobbin 8. Next, the integrated high-voltage coil bobbin 8, low-voltage coil bobbin 9, and connecting tube 5b are fitted to the insulating case body 5a. Further lead wire 10
One end of is connected to the connecting means 6 provided at the lower end of the connecting tube 5b. Next, an insulating resin (not shown) such as an epoxy resin is vacuum-molded so that the high-voltage coil bobbin 8, the low-voltage coil bobbin 9, and the connecting cylinder 5b are enclosed in the insulating case body 5a. Next, the ferrite core 2 and the focus pack 3 are attached to complete the flyback transformer 50. The anode wire 1 is connected to the connecting tube 5 after the flyback transformer 50 is assembled to other parts such as a board and a chassis.
It is connected to the connecting means 6 by being inserted into b.

[0005]

However, the above-mentioned insulating case which is a component of the flyback transformer has the following problems.

Since the structure is such that the connecting tube is fitted in the main body of the insulating case, a connecting step is required. Further, the insulating resin may leak from the connecting portion with the main body of the insulating case, but the structure of the connecting portion must be complicated in order to prevent it from leaking. And in order to simplify the mold structure, the insulation cable
Although the case is divided into two parts, that is, the insulating case body and the connecting tube, the number of parts of the insulating case increases, so that the die cost, the insulating case cost and the management cost increase. Furthermore, when the high-voltage coil bobbin and the connecting tube are connected and then inserted into the insulating case, the connecting tube may come off from the high-voltage coil bobbin, resulting in poor connection. In addition, the lead wire connected to the connecting means may be disconnected due to the displacement of the connecting tube.

An object of the present invention is to integrate a connecting tube for connecting an anode lead wire with an insulating case,
The purpose of the invention is to provide a flyback transformer in which the position of the connecting tube is fixed and there is no disconnection or resin leakage.

[0008]

In a flyback transformer according to claim 1 of the present invention, the output of a high voltage coil housed in an insulating case is drawn out by an anodic wire through a connecting tube. The flyback transformer is characterized in that the connecting tube is integrally formed with the insulating case in the extending direction thereof.

[0009]

The flyback transformer according to the first aspect of the present invention has a structure in which the connecting cylinder provided in the insulating case that constitutes the flyback transformer is integrally molded and held with the insulating case. Therefore, the high pressure diode on the highest pressure side of the lower end of the connecting cylinder
Since the position of the connecting means for connecting the lead wire and the anode lead wire of the lead is fixed, the lead wire for connecting the secondary coil and the connecting means is displaced due to the displacement of the position of the connecting cylinder. Breakage can be prevented. Further, there is no risk of the insulating resin leaking from the connecting portion between the upper end of the connecting cylinder and the insulating case body. In addition, the lower end of the connecting cylinder is displaced and the connecting terminals of the high voltage coil and the high voltage diode
It will not come into contact with the lead wire of the cable and cause a surface dielectric breakdown.

[0010]

First Embodiment A structure of a flyback transformer 20 according to a first embodiment of the present invention will be described with reference to FIGS. The same parts as those of the conventional example are designated by the same reference numerals and the description thereof will be omitted. FIG. 1 is a partial cross-sectional view of the flyback transformer 20, and FIG. 2 is a partial bottom view of the flyback transformer 20.
b, anode wire 1 and the like. In order to insert the anode wire 1 for taking out a high DC voltage into the insulating case 5, a cylindrical connecting tube 5b is provided inside the insulating case 5.
Is provided. The connecting tube 5b is integrally formed so that its upper end is shared with the insulating case body 5a. Further, fixing plates 5d, 5d, 5d, 5d, 5d for connecting the connecting tube 5b and the insulating case body 5a to fix the side surface of the connecting tube 5b to the insulating case body 5a are also integrally formed.

The flyback transformer 20 having such a connecting tube 5b is insulated from the connecting tube 5b as in the conventional example.
Insulating resin does not leak from the connecting portion with the main body 5a and short-circuits due to contact with other parts. Moreover, since the connecting tube 5b for inserting the anode lead wire 1 and the insulating case body 5a are integrated, the connecting tube 5 conventionally required.
The step of connecting b with the insulating case body 5a becomes unnecessary.

(Second Embodiment) A structure of a flyback transformer 30 according to a second embodiment of the present invention will be described with reference to FIG.
The same parts as those of the conventional example are designated by the same reference numerals and the description thereof will be omitted. FIG. 3 is a partial sectional view of the flyback transformer 30, which includes an insulating case 5, a connecting tube 5b, and an anode.
An assembled state of the lead wire 1 and the like is shown. Insulation case 5
Anode wire 1 for extracting high voltage DC
A cylindrical connecting tube 5b is provided on the inner side surface of the insulating case 5 for inserting the connector. The connecting tube 5b is integrally molded so that a part of its side surface is shared with the insulating case body 5a. In the present embodiment, the insulating case 5 of the connecting cylinder 5b is arranged so that the lower end of the connecting cylinder 5b fitted with the high-voltage coil bobbin 8 coincides with the position of the fitting portion of the high-voltage coil bobbin 8.
The side wall on the side is thickened.

The flyback transformer 30 having such a connecting tube 5b is insulated from the connecting tube 5b as in the conventional example.
Insulating resin does not leak from the connecting portion with the main body 5a and short-circuits due to contact with other parts. Moreover, since the connecting tube 5b for inserting the anode lead wire 1 and the insulating case body 5a are integrated, the connecting tube 5 conventionally required.
The step of connecting b with the insulating case body 5a becomes unnecessary.

(Embodiment 3) The structure of a flyback transformer 40 according to Embodiment 3 of the present invention will be described with reference to the partial sectional view of FIG. The same parts as those of the conventional example are designated by the same reference numerals and the description thereof will be omitted. FIG. 4 is a partial cross-sectional view of the flyback transformer 40, showing the assembled state of the insulating case 5, the connecting tube 5b, the anode lead wire 1, and the like.
On the inner side surface of the insulating case 5, there is provided a connecting tube 5b for inserting the anode lead wire 1 for taking out a DC high voltage. The connecting tube 5b is integrally molded so that a part of its side surface is shared with the insulating case body 5a and the thickness thereof is the same as that of the insulating case body 5a. The reason why the wall thicknesses are made uniform is to facilitate the molding of the insulating case 5.

The flyback transformer 40 having such a connecting tube 5b is insulated from the connecting tube 5b as in the conventional example.
Insulating resin does not leak from the connecting portion with the main body 5a and short-circuits due to contact with other parts. Moreover, since the connecting tube 5b for inserting the anode lead wire 1 and the insulating case body 5a are integrated, the connecting tube 5 conventionally required.
The step of connecting b with the insulating case body 5a becomes unnecessary.

[0016]

In the flyback transformer according to the present invention, the connecting tube for accommodating the anode lead wire is formed integrally with the insulating case and is fixed to the insulating case body in the extending direction thereof. It is possible to prevent disconnection of the lead wire connected to the connecting means and short-circuit due to contact of the connecting portion with other parts. Moreover, as in the conventional example, the connection tube and the insulation cable
The insulating resin does not leak from the fitting portion with the spacer.
Further, the connecting cylinder does not come off from the high-voltage bobbin at the time of assembly to cause insulation failure. Moreover, since the number of parts can be reduced, parts cost and management cost can be reduced.

[Brief description of drawings]

FIG. 1 is a partial sectional view of a flyback transformer according to an embodiment of the present invention.

FIG. 2 is a partial bottom view of a flyback transformer according to an embodiment of the present invention.

FIG. 3 is a partial sectional view of a flyback transformer according to another embodiment of the present invention.

FIG. 4 is a partial cross-sectional view of a flyback transformer according to another embodiment of the present invention.

FIG. 5 is an external perspective view of a conventional flyback transformer.

FIG. 6 is a partial sectional view of a conventional flyback transformer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Anode wire 2 Ferrite core 3 Focus pack 4 Anode cap 5 Insulation case 5a Insulation case body 5b Connection tube 5c Lid part 5d Fixing plate 5e Connection port 5f Connection part 6 Connection means 7 High voltage Diode 8 High voltage coil bobbin 9 Low voltage coil bobbin 10 Lead wire 20, 30, 40, 50 Flyback transformer

Claims (1)

[Claims] 1. A flyback transformer in which an output of a high voltage coil housed in an insulating case is drawn out by an anodic wire through a connecting tube, and the connecting tube has an insulating case extending in the extending direction. A flyback transformer characterized by being integrally molded.