JPS5938028Y2 - flyback transformer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flyback transformer that supplies high voltage to a cathode ray tube of a television receiver.

Conventionally, in flyback transformers used in television receivers, in particular in which a low-voltage coil and a flat-wound high-voltage coil are juxtaposed on a bobbin, the fitting and fixing of the bobbin and high-voltage coil is done on the bobbin. This has the disadvantage that it cannot be carried out reliably due to its structure.

That is, FIG. 1 shows a conventional flyback transformer, and in FIG. 1, the bobbin 2 mounted on the core 1 is
A cylindrical portion 3, a flange portion 4 formed in the middle of the cylindrical portion 3 that divides the cylindrical portion 3 into two cylindrical portions 3a and 3b, and a plurality of terminals 5 formed at the end of the cylindrical portion 3 are implanted. A cylindrical portion 3at3b is provided with a fixed terminal mounting portion 6 and is divided into two parts.
A plurality of protrusions 7 are formed on the outer periphery of one of the cylindrical portions 3b in parallel with the axial direction.

Then, the low voltage coil 8 is wound around the outer periphery of the cylindrical part 3a, and the high voltage coil 10, which has been wound flat around the winding frame 9 in advance, is inserted onto the outer periphery of the cylindrical part 3b. The protrusions 7 of the winding frame 9 are brought into contact with the inner circumferential surface of the winding frame 9, and the winding frame 9 is fitted and fixed while being prevented from rotating and coming off.

However, in the flyback transformer having the above configuration, the protrusion 7 formed on the cylindrical portion 3b has a taper toward the end due to the mold-cutting direction of the bobbin 2 (arrow direction in FIG. 2). Since it is formed, it is easy to insert and fit the high voltage coil 10, but there is a drawback that it is easy to come off.

Furthermore, even if the protrusion 7 is not tapered, the dimension of the protrusion 7 must be slightly larger than the inner diameter of the winding frame 9 in order to securely fix the high-voltage coil 10. There was a risk that the high voltage coil 10 would be damaged or deformed due to tight fitting.

The present invention relates to a flyback transformer aimed at solving the above-mentioned drawbacks, and in particular, the present invention relates to a flyback transformer that has a core inserted therein and a high-voltage coil wound around the outer periphery of the flyback transformer that is fitted and fixed onto the cylindrical part of the bobbin. By forming a plurality of protrusions having protrusions at the ends parallel to the axial direction of the bobbin through slits, it is possible to securely fit and fix the bobbin and the high voltage coil. The present invention relates to a flyback transformer that can be safely assembled without damaging the high-voltage coil when fitting the coil into the bobbin.

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

Figure 3:d shows a flyback transformer in one embodiment of the present invention, 11 is a pair of U-shaped cores;
Above, the low voltage coil 12 and high voltage coil 13 are connected to the bobbin 14.
They are installed in a juxtaposed state via the

The bobbin 14 is made of an insulating synthetic resin material, and as shown in FIG.
6, and a substantially fan-shaped terminal attachment portion 17 formed at the end of the cylindrical portion 15 and divided into a plurality of pieces, and a plurality of terminals 18 are implanted and fixed in the terminal attachment portion 17.

Of the cylindrical parts 15a and 15b divided into two by a flange 16 formed in the middle of the cylindrical part 15, the flange 16
A low voltage coil 12 is wound around the outer periphery of the cylindrical portion 15a located between the terminal mounting portion 11 and the other cylindrical portion 15.
A high-voltage coil 13 wound flat on a cylindrical winding frame 19 is fitted and fixed on the outer periphery of b through the winding frame 19.

On the cylindrical portion 15b of the bobbin 14, as shown in FIG. A protrusion 21 is formed at the end of the two opposing protrusions 20,
A protrusion 200 on both sides of which the protrusion 21 is formed has a protrusion 2
A slit 22 is formed along 0.

The protrusion 21 formed at the end of the protrusion 20 is arranged so that when the high voltage coil 13 is fitted onto the cylindrical part 15b,
The bobbin 14 acts as a stopper to prevent it from coming off from the end of the bobbin 14, and has a taper toward the outside of the bobbin 14 to make it easier to insert the high voltage coil 13, and also locks the high voltage coil 13. For this reason, the inner side is made to protrude vertically from the protrusion 20 to form a substantially triangular shape.

In a flyback transformer having such a configuration, bobbin 1
The low voltage coil 12 is wound around the cylindrical portion 15a of the bobbin 1.
The high-voltage coil 13, which has been wound flat on a winding frame 19, is pushed into the cylindrical portion 15b of No. 4 from the end of the cylindrical portion 15b and is fitted and fixed.

Thereafter, a predetermined connection is made to the terminal 18, the transformer portion is molded with an insulating and flame-retardant resin material, and the core 11 is inserted into the bobbin 14.

At this time, the transformer portion may be housed in a case, and the inside of the case may be filled with an insulating/flame-retardant resin material and molded.

In one embodiment of the flyback transformer of the present invention, a flange is formed in the middle of the cylindrical part to divide the cylindrical part into two parts.
Although a bobbin in which low-voltage and high-voltage coils are arranged on each cylindrical part has been described, the shape of the bobbin is not limited to the embodiment. The bobbin may be configured separately from the cylindrical portion around which the bobbin is wound.

As described above, according to the flyback transformer of the present invention, a plurality of protrusions having protrusions at the ends are inserted through slits in the axial direction of the bobbin onto the cylindrical part of the bobbin into which the high-voltage coil is fitted. When the high-voltage coil is inserted into the cylindrical part, the end of the high-voltage coil is locked by the protrusion, and the inner surface of the high-voltage coil (inner peripheral surface of the winding frame)
is in contact with the protrusion, and the high voltage coil is fixed without coming off from or rotating on the cylindrical part.

In addition, by providing the slit, the entire protruding part has elasticity, and even if a protruding part is formed at the tip of the protruding part, there will be no problem in inserting the high voltage coil. It does not apply excessive force to the high voltage coil, and there is no risk of damaging the high voltage coil.

Furthermore, if the core is inserted into the inside of the cylindrical part, the protruding part will be expanded from the inside by the core and its position will be regulated. The high-voltage coil can be fitted and fixed more reliably since it comes into contact with a pressing force.

[Brief explanation of the drawing]

Figure 1 is a partially cutaway side view of a conventional flybank transformer, Figure 2 is a perspective view of the main part of the bobbin that constitutes the same conventional flyback transformer, and Figure 3 is a flyback in an embodiment of the present invention. FIG. 4 is a partially cutaway side view of the transformer, FIG. 4 is a perspective view of a bobbin constituting the flyback transformer, and FIG. 5 is a front view of the bobbin. DESCRIPTION OF SYMBOLS 11... Core, 12... Low voltage coil, 13... High voltage coil, 14... Bobbin, 15a, 15b... Cylindrical part, 20... Projection part, 21... Projection part, 22...
·slit.

Claims (1)

[Scope of utility model registration request] In a flyback transformer in which a low-voltage coil and a flat-wound high-voltage coil are wound side by side on a core, the end is placed on the cylindrical part of the bobbin, into which the core is inserted and the high-voltage coil is fitted and fixed on the outer periphery. A flyback transformer characterized in that a plurality of protrusions having protrusions are formed parallel to the axial direction of the bobbin through slits.