JP2561812Y2 - Flyback transformer - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flyback transformer for supplying a high voltage to a cathode ray tube (CRT) of a television receiver or the like.

[0002]

2. Description of the Related Art In a conventional flyback transformer, as shown in FIGS. 4 and 5, a bottomed cylindrical portion 2 provided on an upper portion of a tongue piece 24 extending from a flange portion 20 of a high-pressure coil bobbin 7.
The cylindrical terminal 5 is fitted and locked in the through hole 21 at the center of the bottom of the cylindrical case 3, and the lower end of the cylindrical body 22 provided on the upper part of the insulating case 1 is fitted and locked in the cylindrical part 23 provided in the high-voltage coil bobbin 7. After filling the insulating case 1 with the insulating material 10, a high-voltage lead wire 11 for anode voltage output is inserted from above the cylindrical body 22 provided in the insulating case 1 and press-fitted to the terminal 5, The insulating material 12 is provided in the cylindrical body 22.
Is filled and sealed.

In this case, since the winding to the high-voltage coil bobbin 7 is provided between the flanges 20a and 20b, the tongue piece 24 and the cylindrical portion 23 for attaching the terminal 5 are not provided.
a and 20b.

In addition, a certain insulation distance is required from the connection between the terminal 5 and the high voltage lead 11 to the exit of the high voltage lead 11. The high-voltage lead wire 11
At the upper end of the cylindrical body 22 of the insulating case 1 which is the outlet part of
A rubber cylindrical holder 17 for holding the high-voltage lead wire 11 at the center of the cylindrical body 22 is attached.

A flyback transformer having such a structure is disclosed, for example, in Japanese Utility Model Publication No. 60-8412 (H01F19).
/ 04).

As described above, in the conventional flyback transformer, the height of the outlet of the high-voltage lead wire 11 is extremely high, and therefore, inside the set of the television receiver, contact with the CRT or the outer box of the set is made. There is a drawback that the arrangement on the printed circuit board is restricted in order to prevent the problem, or the outer box becomes large in order to take a sufficient space.

[0007]

SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned problems in the conventional flyback transformer, and to reduce the height of the outlet of the high voltage lead wire for anode voltage output. Is provided.

[0008]

A flyback transformer according to the present invention is characterized in that a terminal for connecting a high voltage coil and a high voltage lead wire is attached to a cylindrical portion of an insulating case.

[0009]

According to the configuration of the present invention, the terminal is not attached to the flange of the high-voltage coil bobbin, so that the terminal does not hinder the winding operation on the high-voltage coil bobbin, and the mounting position of the terminal is changed to the position of the high-voltage coil bobbin. The height can be reduced to almost the height of the center of the winding portion (between the flanges), and the height of the outlet of the high-voltage lead wire can be reduced.

[0010]

FIG. 1 shows the overall configuration of a flyback transformer according to an embodiment of the present invention, and FIGS. 2 and 3 show the configuration of a connection between a high-voltage lead wire and a terminal. Inside the insulating case 1 of the flyback transformer, there is provided a cylindrical portion 2 extending from the upper end side of the insulating case 1 to substantially the center of the high-voltage coil bobbin 7 in the height direction. 3 has a through hole 4. A cylindrical metal terminal 5 with a bottom having a locking edge 5 a is fitted and locked in the through hole 4. After winding, the low-voltage coil bobbin 6 and the high-voltage coil bobbin 7 are fitted and locked, and after being housed in the insulating case 1, the terminal 8 of the high-voltage coil and the terminal 5 are soldered through the resistance element 9.
It is electrically connected by welding or the like.

Then, together with parts (not shown) such as a high-voltage variable resistor housed in the insulating case 1, it is filled and sealed with an insulating material 10 such as an epoxy resin. At this time, in the conventional flyback transformer shown in FIGS. 4 and 5, the fitting portion between the cylindrical portion 23 provided on the flange portion 20 of the high-voltage coil bobbin 7 and the cylindrical body 22 provided on the insulating case 1. Therefore, a problem that the insulating material 10 leaks into the cylindrical body 22 of the insulating case 1 easily occurs, but the present invention has an advantage that this problem does not occur.

Next, a high-voltage lead wire 11 for extracting an anode voltage is inserted from above the cylindrical portion 2 of the insulating case 1 and connected to the terminal 5, and then filled with an insulating material 12 such as an epoxy resin. At the tip portion of the high-voltage lead wire 11, the outer coating 13 and the inner coating 14 are removed stepwise, and the conductor 15 bent along the outer side of the inner coating 14 is brought into contact with the terminal 5 for electrical connection. That is as usual.

Reference numeral 16 denotes guide ribs provided at three or more locations distributed in the circumferential direction of the cylindrical body portion 2. The guide ribs 16 guide the high-voltage lead wire 11 to the center of the terminal 5, and at the same time, In cooperation, the high-voltage lead wire 11 is held at the center of the cylindrical body 2.

In the flyback transformer having such a structure, the position of the terminal 5 can be lowered to a position between the flanges 18a and 18b of the high-voltage coil bobbin. Even if the depth of the insulating material 12 is sufficiently large, the height of the outlet position 19 of the high-voltage lead wire 11 does not increase so much.

Therefore, the position of the flyback transformer can be made closer to the screen from the neck of the CRT inside the set of the television receiver, the degree of freedom of arrangement on the printed circuit board is increased, and the outer box is made smaller. It becomes possible.

[0016]

As described above, according to the present invention, the height of the outlet of the high-voltage lead wire for outputting the anode voltage is reduced, so that the degree of freedom of arrangement in the set of the television receiver is increased. In addition, it is possible to make the outer box of the set smaller. Further, the fitting between the high-voltage coil bobbin and the case becomes unnecessary, and the leakage of the filled insulating resin at this portion is eliminated.

[Brief description of the drawings]

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

FIG. 2 is a partial configuration diagram (part 1) of the flyback transformer according to the embodiment of the present invention;

FIG. 3 is a partial configuration diagram (part 2) of the flyback transformer according to the embodiment of the present invention;

FIG. 4 is an overall configuration diagram of a flyback transformer according to a conventional example.

FIG. 5 is a partial configuration diagram of a conventional flyback transformer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insulation case 2 Cylindrical part 5 Terminal 6 Low-voltage coil bobbin 7 High-voltage coil bobbin 10 Insulation resin 11 High-voltage lead wire 12 Insulation resin

Claims (1)

(57) [Scope of request for utility model registration] 1. A flyback transformer in which a low-voltage coil, a high-voltage coil, and a high-voltage variable resistor are housed in an insulating case and an insulating resin is injected and filled in the insulating case, wherein an upper end of the insulating case is provided inside the insulating case. A cylindrical terminal extending from the side to approximately the center in the height direction of the high-voltage coil; a metal terminal connected to the end of the high-voltage coil via a resistance element at a lower end of the cylindrical member; A high-voltage lead wire is inserted from the upper end side of the insulating case into the cylindrical portion and connected to the metal terminal, and an insulating resin is injected and filled in the cylindrical portion of the insulating case. Trance.