JPH118145A - Integral type bobbin structure of fly-back transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the generation of damage to a coil coating due to the contact of a lead-out copper wire with a winding copper wire in the integral type bobbin structure of a fly-back transformer, by a method wherein the thickness of ribs is made thick, the intervals between the ribs in the circumferential direction of a bobbin are made narrow, and contact preventive stages are made to protuberantly form at the intervals between the ribs in the circumferential direction of the bobbin, from which a lead-out coil wire is led out. SOLUTION: An integral type bobbin structure of a fly-back transformer is provided with a plurality of ribs 300, which are wound with primary and secondary coils 200 and 800 via an insulating film 600 into a lamination type, are placed on the outer peripheral surface in the circumferential direction of a bobbin 100 at prescribed intervals, are protuberantly formed in a prescribed thickness (t2 ) and closely adhered to the film 600, and are covered with the film 600; coil wire contact preventive stages 300a, which are protuberantly formed at the intervals between the ribs which are led out after the coil 200 is wound on the ribs at the intervals between the ribs 300; and a film guide curvedly formed so that both ends of the bobbin 100 are closely adhered to both ends of the film 600. The contact area of the film 600 with the ribs 300 is increased, and the film 600 is fully adhered closely to the ribs 300.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an integrated bobbin structure of a Fly Back Transformer (FBT) for each display device.
In detail, the thickness of the plurality of ribs on the outer peripheral surface of the bobbin is increased, the interval between the ribs is reduced, and a coil wire contact prevention step is formed at the interval between the ribs drawn out of the coil after winding. , Which can prevent coil coating damage and winding failure
And an integrated bobbin structure.

[0002]

2. Description of the Related Art In general, an FBT is a device that supplies a high voltage to a cathode ray tube of a display device such as a TV receiver and a monitor to affect the brightness and size of a screen. In the conventional FBT integrated bobbin structure, FIGS.
As shown in FIG. 6, a plurality of ribs 30 projecting radially on the outer peripheral surface of the bobbin 10, a primary coil 20 wound between the ribs 30 on the outer peripheral surface of the bobbin 10, An insulating film 60 and a secondary coil 80 wound a predetermined number of times on the outer peripheral surface of the bobbin 10 around which the primary coil 20 is wound;
It was configured with. And each said rib 30
On the outer peripheral surface of the bobbin 10, in the circumferential direction radially placed a predetermined distance L _1, axially position the predetermined distance 40, was formed to have a predetermined thickness t _1.

The primary coil 20 is wound between the ribs 30 on the outer peripheral surface of the bobbin 10, and each of the finally drawn coil wires 20a to be drawn out has a distance L ₁ between the ribs.
After passing through, each of the terminal pins 50 attached to the lower end of the bobbin 10 is connected. The outer peripheral surface of the primary coil 20 is coated with an insulating film 60, and the secondary coil 80 and the insulating film 60 are alternately provided on the outer peripheral surface of the insulating film 60, and the height A of the film guide 70 is changed.
_It was wound up to ₁ .

Further, a plurality of spaces 85 are respectively formed between both ends of the insulating film 60, which is first covered, and the film guide 70 and the rib 30, and the primary coil 20, the insulating film 60 and the secondary After the wound bobbin of the coil 80 is inserted into the case 90,
Molding is performed by injecting an epoxy resin between the and the integrated bobbin, and the space is impregnated with the epoxy resin to be completely insulated.

[0005]

However, in such a conventional FBT integrated bobbin structure, the thickness t _{1 of} each rib is small and the distance L ₁ between the ribs in the circumferential direction of the bobbin is large. Therefore, when the insulating film and the secondary coil are wound alternately, the contact area between the insulating film and the ribs is reduced, the insulating film is not sufficiently adhered, and the coil is wound around the outer peripheral surface. When turning, the insulating film is depressed by the winding force as shown in FIG.
There has been an inconvenience that the electrical characteristics of the FBT deteriorate and the defective rate increases.

In addition, when the extracted coil wire of the primary coil finally extracted is connected to the specific terminal pin, the extracted coil wire comes into contact with the wound coil, so that the electrical characteristics are reduced and The disadvantage is that the coating of the coil is damaged.

Further, a space is formed between the film guides at both ends of the bobbin and the respective ribs, and both ends of the insulating film are released without being in close contact with each other. There has been an inconvenience that the material is molded while being biased, resulting in a change in electrical characteristics of the product and poor quality.

Further, when the epoxy resin is injected, air bubbles are generated due to high temperature, but since there is no passage for discharging, a minute space is generated between the insulating film of the bobbin and the coil, so that the epoxy does not sufficiently penetrate. However, there is an inconvenience that the insulating property is reduced.

Therefore, an object of the present invention is to increase the thickness of each rib, to reduce the interval between the ribs in the circumferential direction of the bobbin, and to set the interval between the ribs in the circumferential direction of the bobbin from which the extraction coil wire is drawn. The present invention is intended to provide an FBT integrated bobbin structure capable of preventing a coil coating from being damaged due to contact between an extracted copper wire and a wound copper wire by projecting a contact prevention step for preventing contact of the extracted coil wire. It is.

Another object of the present invention is to provide an FBT capable of improving insulation by forming a through hole in a bent film guide to discharge bubbles generated during epoxy injection.
To provide an integrated bobbin structure.

[0011]

In order to achieve the above object, in the integrated bobbin structure of the FBT according to the present invention, the primary coil 200 and the secondary coil 800 are laminated with an insulating film 600 interposed therebetween. An integrated bobbin structure of a flyback transformer wound around the bobbin 100
Place the predetermined distance L ₂ on the circumferential outer peripheral surface of the, with a predetermined thickness t ₂ is突成, a plurality of ribs 300 that the insulating film 600 is covered in close contact, each rib 30
In interval L ₂ between 0, after the primary coil 200 is wound, and the coil wire contact prevention step 300a which is突成to the distance L ₂ between the ribs drawn, the both ends of the bobbin 100 A film guide 700 bent so that both ends of the insulating film 600 are in close contact with each other.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. In the integrated bobbin structure of the FBT according to the present invention, as shown in FIGS.
A plurality of ribs 300 projecting on the outer peripheral surface of a bobbin 100 having a film guide 700 bent at both ends
And each of the ribs 300 on the outer peripheral surface of the bobbin 100 in the axial direction.
Between the primary coil 200, the insulating film 600 and the secondary coil 8 wound a predetermined number of times on the outer peripheral surface of the bobbin 100 around which the primary coil 200 is wound.
00 is provided.

Each of the ribs 300 is provided on the outer peripheral surface of the bobbin 100 at a predetermined distance L radially in the circumferential direction.
₂ Place, axially positions the predetermined distance 400, are respectively formed to have a predetermined thickness t _2.

A primary coil 200 is wound between the ribs 300 on the outer peripheral surface of the bobbin 100, and each of the lastly drawn coil wires 200a is connected to the rib 30.
After passing through the spacing L ₂ between 0, but is connected to the terminals 500 of the lower end of the bobbin 100, at this time, the distance L between the respective ribs 300 to be drawn with drawing wire 200a of the primary coil 200 ₂ is formed at a minimum interval for extracting the extraction coil 200a, and the extraction coil 200a and the winding coil 200 wound on the bobbin 100.
contact prevention stage 300a to prevent contact with b is突成a predetermined distance L ₂ between the ribs.

Further, the outer peripheral surface of the primary coil 200 is coated with an insulating film 600.
The width of 0 is determined by the distance between the film guides 700 bent at both ends of the bobbin 100, and both ends of the insulating film 600 are
It is glued on the bent surface of 00.

In addition, the bent film guide 70
0 is a through hole 7 for discharging air bubbles generated during epoxy injection at a portion where the primary coil of the film guide contacts.
00a is perforated.

The outer peripheral surface of the insulating film 600 is
The next coil 800 and the insulating film 600 are wound alternately.
It is turned by the height A ₂ winding. At this time, the insulating film 600, and the secondary coil 800 is wound while being supported by the ribs 300 of the bobbin 100, the thickness t ₂ of each rib 300 is formed thicker than the conventional, the rib because distance L ₂ between 300 is narrower than the conventional, the contact area between the insulating film 600 and the rib 300 is increased, is sufficiently close contact.

The integrated bobbin constructed as described above is mounted in a case 900, and an epoxy resin for insulation is injected between the case and the integrated bobbin under a predetermined pressure and temperature. The generated air bubbles are discharged through the through holes 700a formed in the film guide 700, so that the epoxy resin sufficiently enters between the insulating film 600 and the first and second coils 200 and 800.

[0019]

As described above, the FB according to the present invention is used.
In the one-piece bobbin structure of T, the distance between the ribs in the circumferential direction is reduced, the contact area between the insulating film and each rib is increased, and the winding film of the secondary coil is used to make contact with the insulating film. There is an effect that the depression phenomenon between the primary coils can be prevented, and the deterioration of the electrical characteristics can be prevented.

In addition, a contact prevention step of the coil wire is formed between the drawn-out ribs of the primary coil to minimize the contact between the drawn coil and the wound coil, and the electrical characteristics change due to damage to the coating of the coil. This has the effect of preventing

In addition, the film guides at both ends of the bobbin are bent, and through holes are formed in the upper surface thereof. When molding the epoxy resin, the bubbles generated are quickly discharged, so that the impregnation of the epoxy resin is improved. In addition, there is an effect that the insulating property can be improved.

[Brief description of the drawings]

FIGS. 1A and 1B are views showing an integrated bobbin structure of an FBT according to the present invention, wherein FIG. 1A is a perspective view and FIG. 1B is an enlarged view of a portion B of FIG.

FIG. 2 is a cross-sectional view showing an integrated bobbin structure of the FBT according to the present invention.

3A and 3B are diagrams showing an integrated bobbin structure of the FBT according to the present invention, wherein FIG. 3A is a longitudinal sectional view, and FIG. 3B is an enlarged view of a portion B in FIG.

4 (A) is a perspective view, and FIG. 4 (B) is an enlarged view of a portion B of FIG. 4 (A), showing an integrated bobbin structure of a conventional FBT.

FIG. 5 is a cross-sectional view showing an integrated bobbin structure of a conventional FBT.

FIG. 6 is a longitudinal sectional view showing an integrated bobbin structure of a conventional FBT.

[Explanation of symbols]

100 ... bobbin 200 ... primary coil 300 ... rib 300a ... contact prevention step 400 ... interval 500 ... terminal pins 600 ... insulating film 700 ... film guide 700a ... through hole A ₂ ... film guide height 800 ... secondary coil 900 ... Case L ₂ … Interval t ₂ … Thickness

Claims (4)

[Claims] 1. An integrated bobbin structure of a flyback transformer in which a primary coil and a secondary coil are wound in a laminated manner via an insulating film, wherein a predetermined coil is provided on an outer circumferential surface of the bobbin in a circumferential direction. At intervals, a plurality of ribs that are formed with a predetermined thickness and are covered with the insulating film in close contact with each other, and during the interval between the respective ribs, after the primary coil is wound, An integrated bobbin structure for a flyback transformer, comprising: a step for preventing contact of a coil wire formed at a distance between ribs to be drawn out. 2. The integrated bobbin structure of a flyback transformer according to claim 1, wherein the interval between the ribs protruding from the contact prevention stage has a minimum interval necessary for drawing out a coil wire. . 3. The integrated bobbin for a flyback transformer according to claim 1, wherein a film guide to which both ends of the insulating film are bonded is bent upward at both ends of the bobbin. Construction. 4. The integrated bobbin structure of a flyback transformer according to claim 3, wherein a through hole is formed in the film guide at a portion where the primary coil of the film guide contacts.