JPS5938030Y2 - flyback transformer - Google Patents

Description

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

Recently, as a flyback transformer used in television receivers, multiple flanges are installed in the winding groove of the bobbin.
A system in which a coil, especially a high-voltage coil, is wound in sections in a plurality of winding grooves formed by a collar piece has been developed and put into practical use.

In this case, the coil is wound continuously in each winding groove, and it is important to maintain good insulation between the coils wound in each winding groove, and to ensure that adjacent windings are separated by a collar piece. The wiring between the grooves (crossing wires) can be operated efficiently during winding work, and can be operated safely and reliably without causing electrical withstand voltage failures, and has stable output characteristics. This is highly desirable from the viewpoint of obtaining a flyback transformer suitable for mass production.

In a conventional flyback transformer, as shown in FIG. A coil (mainly a high voltage coil) 5 is inserted into the notch groove 3 using a bobbin 4, which has a notch groove 3 that is diagonal to the tube axis and is positioned linearly along the axis. The connecting wire 5a was continuously wound in sections within the winding groove 2 between the collar pieces 1.

However, in such a configuration, as shown in FIG. A hook-shaped portion 1a and a semicircular portion 1b are formed.

Therefore, when winding the coil 5, the hook-shaped portion 1a is deformed by being pressed by the coil 5, and protrudes in the direction of the adjacent winding groove.
There is a risk of interfering with the winding work or the wiring of the crossover wire 5a, and there is a risk of the crossover wire 5a coming into contact with the side surface of the coil 5 wound in the winding groove 2. In addition to being unfavorable in terms of pressure resistance, the upper side 1b1 of the semicircular portion 1b is provided in the tangential direction to the bottom surface of the winding groove 2, and for example, the height of the bottom surface of the winding groove changes sequentially (the high voltage side However, it is extremely difficult to form a step-shaped bobbin with a structure such as increased thickness, etc., and has disadvantages such as poor applicability.

The present invention relates to a flyback transformer intended to eliminate the above-mentioned drawbacks, and in particular to a flyback transformer in which a bobbin collar piece is provided with a stepped portion for wiring a crossover wire.

An embodiment of the present invention will be described below in detail with reference to the drawings.

In FIG. 3, reference numeral 11 denotes a pair of U-shaped cores, a low voltage coil 13 is wound around the core 11 via a low voltage bobbin 12, and a high voltage coil is wound around the outer periphery of the low voltage coil 13 via a high voltage bobbin 14. 15 are wound.

The low voltage bobbin 12 around which the low voltage coil 13 is wound is provided with a terminal planting part 16 at one end, and a plurality of terminals 17 are planted and fixed in the terminal planting part 16.

On the other hand, the high voltage bobbin 14 around which the high voltage coil 15 is wound is
As shown in FIG. 4, a plurality of collar pieces 18 are provided at predetermined intervals on the outer periphery of the winding portion 14a, and a plurality of winding grooves 19 are partitioned by the collar pieces 18. 15! (d) A section is wound in each winding groove 19 of the high-pressure bobbin 14.

Each of the collar pieces 18 of the high-pressure bobbin 14 is provided with a notch groove 20 located linearly along the axial direction.

As shown in FIG. 5, the cutout groove 20 has a depth that reaches the surface of the winding part 14a, and is provided in a direction perpendicular to the surface of the winding part 14a (in the mold removal direction). The crossover wire 15a of the high voltage coil 15 is inserted into the cutout groove 20,
As a result, the high voltage coil 15 is continuously wound within each winding groove 19.

As shown in FIG.
One side surface 18a1 near one end 18a of 18b
A connecting wire 15a of the high-voltage coil 15 is provided on a side surface 18b1 opposite to the side surface 18aH on the end 18a side near the other end 18b (the surface on which the tapered portion 21 is provided). A stepped portion 22 is provided for wiring.

Of the tapered portion 21 and step portion 22 provided on the flange piece 18, the tapered portion 21 is configured such that the thickness of the flange piece 18 decreases as it goes toward the notch groove 20 (end portion 18a) side,
Further, the stepped portion 22 is configured in a tapered shape so that the depth gradually increases (the thickness of the collar piece 18 decreases) as it goes toward the notch groove 20 (end portion 18b) side, and the tapered portion 21 and the stepped portion 22 and the tapered surface 22a are located on an extension line of each other, and the bottom side 22b of the stepped portion 22 has an inclination that coincides with a tangent to the bottom surface of the next winding groove.

Here, the step 22 provided on the end 18b side of the flange piece 18 has been described in a tapered shape so that the depth gradually increases as it goes toward the notch groove 20 side.
This is no different from forming the stepped portion 22 by forming one side surface 18b1 on the end 18b side of the flange piece 18 into a tapered surface 22a in advance and making a part of the tapered surface 22a protrude.

In addition, in FIG. 3, 231-1. A case that stores 13 low-voltage coils and 15 high-voltage coils inside, 2
Reference numeral 4 denotes a molding material made of a flame-retardant insulating resin injected into the case 23.

In the flyback transformer having such a configuration, the low voltage coil 13 is wound around the low voltage bobbin 12, and the high voltage coil 15 is wound in sections around the high voltage bobbin 14, so that both coils 13
, 15 are attached and fixed onto the core 11.

Here, the high-voltage coil 15 is wound around the high-voltage bobbin 14 in the first winding groove 1 of the high-voltage bobbin 14.
9a, the connecting wire 15a is routed along the bottom side 22b of the stepped portion 22 provided on the collar piece 18, and then passed through the notch groove 20 of the collar piece 18 to the next (second) wire. The wire is connected to the bottom of the winding groove 19b, and is wound in series in the second winding groove 19b, and then wound in the same manner one after another. Notch groove 2
The wiring can be wired without coming into contact with the side surface of the high voltage coil 15 that passes through the winding groove 19 and is wound within the winding groove 19.

In addition, in one embodiment of the flyback transformer of the present invention, a high-voltage bobbin around which a high-voltage coil is wound is provided with a plurality of collar pieces, and the collar pieces are provided with cutout grooves and stepped portions for wiring wiring. However, it can also be applied to a low-voltage bobbin around which a low-voltage coil is wound.

In addition, in one embodiment of the present invention, a high-pressure bobbin having the same size and shape (height of the bottom surface of the winding groove and depth of the groove) is used as the bobbin provided with the cutout groove and the stepped portion. By appropriately changing the inclination angle of the stepped portion 22 for crossover wiring, a shape in which the height of the bottom surface 19T of the winding groove 19 gradually increases toward the high voltage side can be obtained, as shown in FIGS. 7A and 7B. A similar configuration can be applied to the stepped high pressure bobbin 14K.

Furthermore, in one embodiment of the present invention, a stepped portion for crossover wire wiring is provided only on one side near one end of the ends located on both sides of the notch groove. As shown in FIG. 8, a step 22 provided on one side surface 18b1 near the end 18b of the collar piece 18 may be provided continuously at the bottom of the cutout groove 20. This is more effective for wiring.

As described above, according to the flyback transformer of the present invention, in a flyback transformer in which a coil is section-wound through a bobbin whose winding portion is divided into a plurality of pieces by a plurality of flange pieces, the flange of the bobbin A notch groove is provided in the piece for the insertion of the crossover wire, and a step for wiring the crossover wire leading to the notch groove is provided on at least one of opposing sides near the ends of the collar pieces located on both sides of the notch groove and corresponding to each other. 1-! The collar piece is deformed near the notch groove when the coil is wound. , the winding work can be done smoothly and there is no risk of the coils wound in adjacent winding grooves coming into contact with each other and causing poor insulation, improving reliability. In addition, the crossover wire of the coil is routed through the stepped part of the collar piece, so that the crossover wire can be wired efficiently for work, and the crossover wire can come into contact with the side surface of the coil wound in the winding groove. This does not cause any problems such as pressure resistance.

Furthermore, the notch grooves of the collar piece are all located in the mold removal direction, and the height of the bottom of the winding groove changes sequentially, which was difficult to achieve in the past. This method can be applied by appropriately changing the inclination angle of the steps for arranging crossover wires, and has various effects such as an extremely wide range of applications.

[Brief explanation of drawings]

Fig. 1 is a side view of a conventional flyback transformer in which a coil is wound in sections around a bobbin, Fig. 2 is a partial front view of the same, and Fig. 3 is a cross-sectional side view of a flyback transformer according to an embodiment of the present invention. , Fig. 4 is a side view of the high-pressure bobbin, Fig. 5 is a front view of the main parts of the high-pressure bobbin, Fig. 6 (d) is a perspective view of the main parts of the collar piece, and Figs. A sectional side view and a side view of a high pressure bobbin in another example, and FIG. 8 is a front view of a main part of a collar piece in another example of the present invention. 12...Low pressure bobbin, 13...Low pressure Coil, 14・
... High pressure bobbin, 15 ... High voltage coil, 18 ... Flange piece, 18a, 18b ... Flange piece end, 20 ... Notch groove, 22 ... Step sound paste

Claims (1)

[Scope of utility model registration request] In a flyback transformer in which a coil is section-wound through a bobbin whose winding portion is divided into a plurality of pieces by a plurality of collar pieces, the collar piece of the bobbin is provided with a cutout groove for inserting a crossover wire, A flyback transformer characterized in that at least one of opposing side surfaces near the ends of the collar pieces located on both sides of the notch groove and corresponding to each other is provided with a stepped portion for connecting wire wiring leading to the notch groove. .