JP2001155940A - Transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transformer which can easily relax an electric field concentration at a high voltage extraction part without requiring of applying insulating agent and so on. SOLUTION: A conductor 4a, having an area wider than the projecting area of a high voltage extraction line 3 is implanted at a brim of a coil bobbin 1 so as to be exposed from a high voltage extraction trench 5, from which the high voltage extraction line 3 is introduced and is made to have electrically the same voltage structure by connecting a high-voltage terminal 4 on which the high voltage extraction line is wound, with this conductor 4a, therefore applying insulating agent and so on is not required, electric field concentration of the high voltage extraction line 3 is relaxed and a discharging voltage can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer for generating a high voltage, and more particularly to a structure for alleviating the concentration of an electric field generated on a high-voltage lead (thin wire).

[0002]

2. Description of the Related Art FIG. 3 is an overall structural view of a conventional transformer, and FIG. 4 is a sectional view of a main part thereof. As shown in FIG.
A high-voltage winding 2 (2a, 2b, 2c, 2
d, 2e) are wound, and the high-voltage lead 3
Is drawn out from a high-pressure drawing groove 5 formed in a flange portion of the coil bobbin 1. A high voltage terminal 4 is provided on the collar of the coil bobbin 1.
Is implanted, and the high-voltage lead-out line 3 pulled out from the high-voltage lead-out groove 5 is wrapped around the high-voltage terminal 4. FIG. 4 shows a cross section of a flange portion of the coil bobbin 1.

[0003]

As described above, in the case of a structure in which the terminal of the high-voltage winding is a high-voltage lead and is connected to the high-voltage terminal through the high-voltage lead groove of the coil bobbin, the lead wire is a thin wire. When the output voltage increases, the electric field concentrates on the lead wire portion, and there is a disadvantage that the discharge is easily caused between the ground conductor near the transformer and the lead wire portion. Attempts have been made to apply an insulating agent between the ground conductor and the lead wire to suppress this discharge. However, there is a problem that steps such as adjustment, application, and drying of the insulating agent are required, resulting in poor work efficiency. .

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a transformer which does not require application of an insulating agent or the like and which can easily alleviate the electric field concentration in the high-voltage lead-out portion.

[0005]

In order to achieve the above object, a first means is to provide a coil bobbin in the vicinity of a high-voltage lead wire,
A conductor having a larger area than the projected area of the high-voltage lead wire is attached.

A second means is that, in the first means, the conductor is embedded in a flange portion of the coil bobbin so as to be exposed from a high-pressure lead groove from which a high-voltage lead wire is drawn.
In addition, a high-voltage terminal for connecting a high-voltage lead wire and this conductor are connected to each other to have the same electric potential.

The transformer according to the present invention employs a structure in which a high-voltage lead wire is drawn out so as to be in contact with a conductor buried in the high-voltage lead groove, and is connected to a high-voltage terminal. Therefore, the electrode of the high-voltage lead-out portion is changed from a linear electrode (a thin high-voltage lead-out line) to a flat electrode (buried conductor), and the area is increased to reduce the electric field concentration.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an overall structural diagram of a transformer according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of a main part thereof.
As shown in FIG. 1, a high-voltage winding 2 (2
a, 2b, 2c, 2d, 2e) are wound, and the high-voltage lead wire 3 which is the terminal thereof is drawn out from the high-pressure lead groove 5 formed in the flange of the coil bobbin 1. A high-voltage terminal 4 is implanted in a flange portion of the coil bobbin 1, and a high-voltage lead wire 3 drawn from a high-voltage drawing groove 5 is wrapped around the high-voltage terminal 4.

As shown in FIG. 2, a conductor 4a made of, for example, a metal plate is provided integrally with the high voltage terminal 4, and the high voltage terminal 4 and the conductor 4a have the same potential. This conductor 4a
Has a larger area than the projected area of the high-voltage lead wire 3, and is embedded in the flange of the coil bobbin 1 so as to be exposed to the outside from the high-pressure lead groove 5. Therefore, the high-voltage lead wire 3 comes into contact with the conductor 4 a in the high-voltage lead groove 5.

[0010]

According to the present invention, a conductor having an area larger than the projected area of the high-voltage lead line is embedded in the flange of the coil bobbin so as to be exposed from the high-voltage lead groove from which the high-voltage lead line is drawn. Since this conductor is electrically connected to the high-voltage terminal that ties the lead wire, it does not need to be coated with an insulating agent, etc.
The discharge voltage can be reduced.

[Brief description of the drawings]

FIG. 1 is an overall structural diagram of a transformer according to an embodiment of the present invention.

FIG. 2 is a sectional view of a main part thereof.

FIG. 3 is an overall structural diagram of a transformer according to a conventional example.

FIG. 4 is a sectional view of a main part thereof.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 coil bobbin 2 high-voltage winding 3 high-voltage lead 4 high-voltage terminal 4 a high-voltage lead groove buried conductor 5 high-voltage lead groove

Claims (2)

[Claims] 1. A transformer characterized in that a conductor having a larger area than the projected area of the high voltage lead is attached to the coil bobbin near the high voltage lead. 2. The high-voltage terminal according to claim 1, wherein the conductor is embedded in a flange portion of the coil bobbin so as to be exposed from a high-voltage lead groove from which the high-voltage lead is drawn, and a high-voltage terminal for winding the high-voltage lead. A transformer characterized in that the conductors are connected to make them electrically the same potential.