CN1199911A - Single body bobbin structure for flyback transformer - Google Patents

Abstract

A single bobbin component for a line output transformer, on which a first coil, an insulating film and a second coil are sequentially wound, and a plurality of ribs in the circumferential direction extend radially from its outer circumference , and each rib has a predetermined thickness and forms a recessed channel to fix and support the insulating film, and a protrusion to prevent contact is formed in the recessed channel of these ribs, so that the coil extension arm of the first coil able to pass through the above channels. The bobbin component increases the contact area between the insulating film and the fins, prevents the insulating film from sagging, enables the epoxy resin to be injected smoothly, and improves the insulating performance.

Description

Single bobbin components for line output transformers

The present invention relates to a coil bobbin structure for a line output transformer of a raster display device of a cathode ray tube, and more particularly, to an improved single bobbin structure for a line output transformer, which can To allow the coil to be wound on it quickly and accurately without damage, the measure is to increase the thickness of the many ribs extending from the outer circumference of the bobbin, and to reduce the width of the channel formed in the middle of these ribs, And a protrusion to prevent contact is provided in the above-mentioned channel.

A horizontal output transformer (FBT) is used as a component in a circuit that supplies high voltage to the anode of a Brownian tube of a display device, such as a television or monitor, which affects the brightness and size of images on the display screen.

Next, a single-body bobbin structure of a conventional row output transformer will be described with reference to the accompanying drawings.

Fig. 1A is a perspective view of a common single bobbin structure of a horizontal output transformer, and Fig. 1B is a partially enlarged view thereof. Figure 2 is a cross-sectional view of such a conventional one-piece bobbin structure. Fig. 3 is a longitudinal sectional view of such a conventional one-piece bobbin structure.

As shown, a plurality of ribs 30 radially extend from the outer peripheral surface of the bobbin 10 to define the number of windings on the first coil 20 and support the insulating film 60 fixed thereon. This structure will be described below.

The thickness t1 of each rib 30 is relatively thin, while the circumferential width of the recessed channel 5 formed between each rib 30 is relatively large.

Also, a circumferential groove 40 is formed between each longitudinally adjacent pair of ribs 30 .

The above-mentioned first coil 20 is wound in each groove 40 around the outer circumference of the bobbin 10, and a coil extension arm 20a of the first coil 20 passes through the corresponding channel 5 in the rib 30, and leads to the coil provided on the winding wire. On one of the many terminal pins 50 at the lower bottom of the tube 10.

The insulating film 60 wraps the above-mentioned first coil 20 . The height of the insulating film 60 is limited by film guide flanges 70 formed at the upper and lower ends of the bobbin 10 .

Then, the second coil 80 and another insulating film 60 alternately wrap the first insulating film 60 until its entire thickness reaches the radial length L1 of the film guiding flange 70 as shown in FIG. 3 .

Here, the above-mentioned insulating film 60 and the second coil 80 are wound on and supported by the rib 30 of the bobbin 10 .

Corresponding spaces 85 are formed between the ends of the insulating film 60 , the film guide flange 70 and the end fins 30 at upper and lower ends on the circumference of the bobbin 10 .

The single-body bobbin wound with the first coil 20, the insulating film 60 and the second coil 80 is put into a casing 90, and an epoxy resin mixture is injected between the single-body bobbin and the casing 90 , for insulation.

However, in the conventional one-piece bobbin member described above, the thickness of the ribs 30 is relatively thin, and the recessed passage 5 formed in these ribs 30 for passing the coil extension arm 20a is relatively thin. As a result, the insulating film 60 and the second coil 80 will sag at I in FIG. 2 . That is, due to the contact area between the insulating film 60 and the rib 30, when the second coil 80 is wound on it, it appears too small for allowing the insulating film to be attached tightly enough to a corresponding piece of rib 30, Therefore, the force of winding makes the insulating film 60 sag, so that the electrical performance of the line output transformer is deteriorated, and the quality is reduced.

And, when the coil extension arm 20a extended from the end of the first coil 20 at last is connected on the selected terminal pin 50, the coil extension arm 20a is just in contact with the winding below the first coil 20, thereby There is a risk of damaging the coating of the coil and deteriorating its electrical properties.

Also, at the upper and lower ends of the single body bobbin 10, the space 85 formed between the above-mentioned film guide flange 70 and the rib 30 will prevent the end of the insulating film 60 from being well fixed. During injection of the epoxy mixture, the aforementioned coil sections may be accidentally bent, and such bent coil wires cannot be corrected, altering the electrical performance and resulting in poor quality.

Furthermore, in the process of injecting the epoxy resin insulating compound, air bubbles may be generated due to its high temperature, and there is no vent hole through which the generated air bubbles can be discharged, and as a result, unevenness may be generated between the coils. The spaced gaps are desired so that the epoxy mixture cannot penetrate the individual coils sufficiently, thereby deteriorating the insulation.

The purpose of the present invention is to solve the existing disadvantages. Accordingly, an object of the present invention is to provide a single body bobbin structure for a horizontal output transformer (FBT), which can prevent damage to the coil plating and poor wiring of the coil by increasing the flow rate from the bobbin in the radial direction. The thickness of many ribs extending from the outer circumference of the outer circumference, reducing the width of the recessed channel formed between adjacent ribs on the outer circumference, and forming a protrusion under the coil extension arm to prevent contact support .

Another object of the present invention is to provide a single-body bobbin structure for a line output transformer, which has insulating film guide flanges at each end of the bobbin, and has ventilation holes on its insulating film guide flanges. , so that the end of the insulating film can be tightly attached to the film guide, and the air bubbles generated during the injection of the epoxy resin mixture can be discharged through the pores, so that the epoxy resin mixture can be injected into the film smoothly. In bobbin components.

In order to achieve the above object, according to the present invention, a single bobbin component for a line output transformer is provided, which is characterized in that a first coil is wound sequentially and alternately on the single bobbin component, A layer of insulating film and a second coil extend radially from its outer circumference a plurality of ribs in the circumferential direction, and each rib has a predetermined thickness and a recessed passage is formed therebetween, so that An insulating film is fixedly supported thereon, and contact-preventing projections are formed in the recessed passages of the ribs so that a coil extension arm of the above-mentioned first coil can pass through the passages.

The above and other advantages of the present invention will be more clearly understood from the following detailed description. However, it should be understood that the specific preferred embodiments of the present invention described in detail are only to illustrate the present invention, rather than to limit the present invention. Obviously, for those skilled in the technical field of the present invention, within the scope of the inventive concept , various changes and improvements can be made.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the attached picture:

Fig. 1A is a partially cutaway perspective view illustrating a single bobbin component of a conventional line output transformer, and Fig. 1B is a partially enlarged view;

Figure 2 is a partial cross-sectional view illustrating a single bobbin structure of a prior art row output transformer;

Fig. 3 is a sectional view illustrating a single bobbin component of a conventional row output transformer;

Fig. 4A is a partially cutaway perspective view illustrating a single bobbin member of a line output transformer according to the present invention, and Fig. 4B is a partially enlarged view;

Figure 5 is a partial cross-sectional view illustrating a single bobbin structure of a line output transformer according to the present invention;

Fig. 6 is a longitudinal sectional view illustrating a single bobbin structure of a horizontal output transformer according to the present invention.

Referring to the accompanying drawings, a single bobbin structure for a row output transformer according to a preferred embodiment of the present invention will be described below.

As shown in Fig. 4A-Fig. 6, a plurality of ribs 300 in the circumferential direction extend radially from the outer circumference of the bobbin 100 to determine the number of windings of the first coil 200 on it, and are fixedly supported. The insulating film 600 and the second coil 800 will be further described below.

The thickness t2 of each fin 300 is relatively thick, and the plurality of recessed channels 150 formed in each fin 300 are relatively narrow.

A groove 400 is formed in the space between each longitudinally adjacent pair of ribs 300 .

The first coil 200 is wound in each groove 400 along the outer circumference of the bobbin 100, and a coil extension arm 200a of the first coil 200 passes through the corresponding channel 150 in the rib 300, and is arranged on the bobbin 100. A selected one of the many terminal pins 500 at the lower bottom of the terminal pin is connected.

The recessed channel 150 formed in each rib 300 to guide the coil extension arm 200a of the first coil 200 has at least a width necessary for the passage of the coil extension arm 200a. A contact preventing support protrusion 300 a is formed inside at least one channel 150 to prevent the coil extension arm 200 a from coming into contact with the coil winding 200 b of the first coil 200 .

A layer of insulating film 600 wraps the first coil 200 . At this time, the height of the insulating film 600 is limited by the stepped film guides 700 formed at the upper and lower ends of the bobbin 100, extending longitudinally and shoulder-shaped transversely. Therefore, the upper and lower ends of the insulating film 600 are attached to both inner sides of the film guide 700, respectively.

A vent hole 700a is formed in a shoulder portion of an upper film guide 700, so air bubbles generated during the injection of the epoxy resin mixture can be discharged through the vent hole.

Then, a second coil 800 and another insulating film 600 are alternately wound on the first insulating film 600 until their full thickness reaches the radial height L2 of the film guide 700 as shown in FIG. 6 .

At this time, the above-mentioned second insulating film 600 and the second coil 800 that are wound are supported by the ribs 300 of the bobbin 100 . The thickness t2 of each fin 300 is relatively thick, and the channel 150 formed in the fin 300 is relatively narrow, so the contact area between the insulating film 600 and the fin 300 is relatively large, thereby obtaining sufficient fixation.

The above-mentioned single bobbin wound with the first coil 200, the insulating film 600 and the second coil 800 is put into a casing 900, and then epoxy resin is injected into the gap between the single bobbin and the casing 900 Mixture, for insulation.

When injecting the epoxy resin mixture, if air bubbles are generated due to high temperature, the air bubbles can be discharged through the vent hole 700a formed in the upper film guide 700, and as a result, the epoxy resin mixture can be fully and completely Between the insulating film 600 and the first and second coils 200 , 800 is injected.

As described above, the single-body bobbin member for the horizontal output transformer according to the present invention increases the contact area between the insulating film and the ribs, preventing the insulating film from being twisted due to the winding force when the second coil is wound. The insulating film sags radially, thereby preventing the possibility of deterioration of electrical properties due to undesired deterioration of the insulating film and the second coil.

Further, contact preventing protrusions are formed in each rib to internally guide the coil extension arms of the first coil, minimizing the contact area between the coil extension arms and the lower winding of the first coil The extent, thereby preventing the change of the electrical performance of the line output transformer.

In addition, the insulating film guide flanges at the upper and lower ends of the bobbin are stepped, and the air hole passes through the film guide, so that the air bubbles generated when injecting epoxy resin pass through the air hole. At the same time, the insulating film is tightly attached to the guide flange, so that the epoxy resin mixture can be fully injected, thereby improving the insulating effect.

Since the present invention can be implemented in various forms without departing from the spirit and basic characteristics of the present invention, the above embodiments, unless otherwise stated, are not limited to the details set forth, but instead should be described in the claims. A broader interpretation within the scope of the identified purpose and concept. Therefore, all changes and improvements of the present invention, and their equivalents are included in the scope of the claims of the present invention.

Claims (4)

1. monomer bobbin structure that line output transformer is used, order also alternately is wound with one first coil on this monomer bobbin structure, one deck insulation film and one second coil, it is characterized in that, the monomer bobbin structure that this line output transformer is used comprises: the fin that radially extends many circumferencial directions from its excircle respectively, and the recessed passage that each piece fin has preset thickness and forms betwixt, so that fixed bearing one deck insulation film thereon; And

In the recessed passage of these fins, formed and prevented from the projection that contacts to make the single line circle adjutage of above-mentioned first coil can pass through above-mentioned passage.

2. bobbin structure as claimed in claim 1 is characterized in that, the above-mentioned passage that forms in each fin has at least is enough to the width that allows the coil adjutage pass through.

3. bobbin structure as claimed in claim 1 is characterized in that, each upper end and bottom at above-mentioned insulation film are provided with step-like film guide, so that allow above insulation film is close to.

4. bobbin structure as claimed in claim 3 is characterized in that, above-mentioned air vent hole forms on of the top of above-mentioned film guide at least.

Images