MXPA95001395A - Challenge time transformer - Google Patents

Abstract

A return-time transformer, which has a pair of cores, U-shaped, butted on the legs mutually. The butt portions of the cores, at least on one side, are connected by an adhesive containing a conductive material, which is prepared by adding a conductive material to an insulating adhesive, at a percentage within the range of about 1 to 15. % in pe

Description

TRANSFORMER OF RETURN TIME BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a return time transformer and, more parlarly, to a connection between the cores of a return time transformer. 2. Description of Related Art A gives transformer flyback has conventionally been known as an output transformer lateral deviation, which provides a high direct voltage to an anode of a cathode ray tube of a television or the like. Figures 5 and 6 show this conventional return time transformer. The flyback transformer core comprises two U-shaped adjacent each other in their legs, a reel section 2 low primary voltage, the cores 1 Ib of legs are inserted in the spool section of low voltage, while its other leg is outside of the reel section 2, a section 3 of secondary high voltage reel, which is mounted around the low-voltage reel section 2, and a cover 4 encloses the reel section 3 of high voltage, and fill it with an insulating resin (not shown). In the cover 4, in addition, other necessary elements are supplied, such as the high-voltage rectifying diodes, capacitors, resistors, etc., although they are not shown in Figures 5 and 6. The number in Figure 5 denotes a focus potentiometer mounted on the return time transformer. The cores 1 are joined together by connecting their legs Ia and Ib by an insulating adhesive 7 (eg, silicone, acrylic, epoxy or similar), with an insulating cap 6 among them. In order to ensure integration, the legs, which are outside the cover 4, are retained by a metal spring 8, U-shaped. The joined cores 1 form a magneflow path, and the insulating cover 6 is to prevent saturation of the magnetism of the cores 1. The insulating cap 6 may be provided in one of the connection portions between the legs and between the legs Ib or may be provided in both connection portions. The metal spring 8 also functions to electrically connect the lower core 1, which goes to ground, to the upper core 1. The low voltage reel section 2 is composed of a cylindrical insulating coil 9 and a wire 10, for example, a enamel copper wire wound in section around the coil 9. The cylindrical coil 9 has divisions in the circumference and a flange 9a in the lower end. The wire 10, after being wound in each section between two adjacent divisions, is once guided downward to the flange 9a and is connected to one of the terminal pins 11 projecting from the flange 9a. Section 3 of high voltage reel consists of a cylindrical coil insulator 12 and a wire 13, for example, a copper wire enamel, winding around the bobbin 13. The cylindrical coil 12, the spool section 2 Low voltage is inserted. In the conventional return-time transformer described above, the metal spring 8 is provided to the joined cores in order to electrically connect the cores 1. For this purpose, other arrangements have also been conventionally adopted. For example, as shown in Figure 7, instead of supplying the spring 8 metal, the legs of the core 1 are coated with a conductive adhesive 14. In this case, the conductive adhesive 14 electrically connects the lower core to upper core 1. At the junction of the cores 1 of the return time transformer, shown in Figures 5 and 6, the metal spring 8 must be prepared as a separate part from the U-shaped cores 1 and must be fixed to the cores 1. Thus, the spring 8 of metal increases the cost and the number of processes. By joining the cores, shown in Figure 7, after connecting the two cores, U-shaped, by the insulating adhesive 7, the conductive adhesive 14 must be coated on the legs in a separate process, and this also increases the cost and the number of processes.

SUMMARY OF THE INVENTION An object of the present invention is to provide a return time transformer, which requires a lower cost and fewer processes for its assembly. A return-time transformer, according to the present invention, has U-shaped cores abutting each other on its legs, and the legs, at the top of the cores at least on one side, are connected by an adhesive containing a conductive material, which is prepared by adding a conductive material to an insulating adhesive, in a percentage within a range of about 1 to 15% by weight. In the structure, since the butts of the cores at least on one side are connected by an adhesive containing a conductive material, the cores are electrically connected to each other.

BRIEF DESCRIPTION OF THE DRAWINGS This and other objects and features of the present invention will be apparent from the description with reference to the accompanying drawings, in which: Figure 1 is a sectional view of a return time transformer, according to the present invention, showing the general structure; Figure 2 is a side view of the cores having a modified first connection therebetween; Figure 3 is a side view of the cores, which have a second modified connection between them; Figure 4 is a graph showing the relationship between the strength of the adhesive and the percentage of a conductive material contained within the adhesive; Figure 5 is a perspective view of a conventional return time transformer; Figure 6 is a sectional view of the conventional return time transformer, showing the general structure; and Figure 7 is a side view of the cores of another conventional return time transformer.

DETAILED DESCRIPTION OF THE PREFERRED MODALITIES Preferred embodiments of the present invention are described with reference to the accompanying drawings. Figure 1 is a sectional view of a return time transformer, according to the present invention, showing the general structure. Figure 2 is a side view of a first modified core of the return time transformer and Figure 3 is a side view of a second modified core of the return time transformer. The fundamental structure and elements of the return-time transformer of the mode are basically the same as those of the conventional return-time transformers. In Figures 1 to 3, the same or corresponding parts and elements, such as those shown in Figures 5 to 7, are provided with the same reference symbols, and the detailed description of these elements is omitted. The return-time transformer, according to the present invention, as in the conventional ones, described above, comprise the l-shaped cores 1 on top of each other, a low-voltage reel section 2, in which the legs Ib of the cores 1 are inserted, a high-voltage reel section 3, mounted around the low-voltage reel section 2, and a cover 4, which encloses the high-voltage section 3 with an insulating resin (not shown) ) fills within it. The other legs of the cores 1 are outside the cover 4. Insulating covers are provided in the connecting portions, between the legs la and between the legs Ib of the cores 1. The legs Ib inserted in the cylindrical coil 9 of the section 2 of the low voltage spool, are connected by an insulating adhesive 7 (for example, silicone, acrylic, epoxy and the like), to a percentage in the range of about 1 to 15%. The conductive material is practically coal dust, for example, oven black, carbon black, acrylic black, etc., or metal powder, for example nickel powder, silver, molybdenum, aluminum, etc. The conductive material and the insulating adhesive are sufficiently stirred. The percentage of conductive material is changed, depending on the diameter of the particles of the conductive material. Figure 4 shows the relationship between the strength of the adhesive of the cores 1 with each other and the weight percentage of the conductive material contained in the adhesive 15. Figure 4 is the result of a tensile strength test. The adhesive 15, which contains the conductive material, is prepared by adding oven black, which is a conductive material, to a thermosetting liquid silicone adhesive, which is an insulating adhesive, and the adhesive 15 is coated on the ends of the legs a of the nuclei 1 with a thickness of 50 μm. Next, the joined nuclei are subjected to the test. As is evident from Figure 4, as the percentage of the furnace black is increased to 5% by weight, the strength of the adhesive is increased, due to the consolidation action of the carbon. However, as the percentage of carbon black is increased above 5% by weight, the strength of the adhesive decreases. Whereas an adhesive strength of not less than 15 gf / cm2 is required for the connection between the cores 1, although the required adhesive strength depends on the class and use of the return time transformer, the conductive material must be added to no more than 15% by weight. The reason why a conductive adhesive 14 on the market is not used is that any ordinary conductive adhesive on the market contains conductive material in a percentage within the range of 20 to 80% by weight and has poor strength and strength. to the humidity also poor. In this embodiment, although the legs Ib of the cores 1 are connected by the insulating adhesive 7, the cores 1 are electrically connected because the other legs of the cores 1 are connected by an adhesive 15 containing a conductive material. According to the experiments conducted by the inventors, an adhesive prepared by adding carbon powder to a 4% by weight silicone insulator adhesive can electrically connect the cores 1 when the distance between the legs is 0.5 mm- In this embodiment , the legs of the cores 1 are connected by the adhesive 15 containing the conductive material. However, it is possible to use the adhesive 15 containing the conductive material for the connection between the legs or to use this adhesive 15, which contains the conductive material, for both connections between the legs la and between the legs Ib. In the return time transformer shown in Figure 1, an insulating cap 6 is provided between the legs 1 and the cores 1. However, as shown in Figure 2, it is possible to connect the legs to the adhesive 15 which It contains the conductive material without supplying the insulating cap 6. Also, as shown in Figure 3, instead of the insulating cap 6, a conductive cap 16 can be supplied between the legs the, which are connected by the adhesive 15 which contains the conductive material. Although the present invention has been described in connection with the above preferred embodiments, it will be noted that various changes and modifications are possible to those skilled in the art. These changes and modifications, it will be understood, are within the scope of the present invention.

Claims (6)

1. NOVELTY OF THE INVENTION Having described the present invention, it is considered as a novelty and, therefore, the content of the following is claimed as property: CLAIMS 1. A transformer of return time, this transformer comprises: a pair of cores in U-shape, butt in their paws mutually; an adhesive containing conductive material for connecting the legs to the top of the cores at least on one side, this adhesive containing conductive material is prepared by adding a conductive material to an insulating adhesive at a percentage within the range of about 1 to 15 % in weigh; a low voltage reel, wound around the cores; and a high voltage reel, wound around the low voltage reel.
2. 2. A return time transformer, as claimed in claim 1, wherein the insulating adhesive contains a silicone resin, an acrylic resin or an epoxy resin.
3. 3. A return time transformer, as claimed in claim 1, in which the conductive material contains metal powder of the selected group of nickel, silver, molybdenum and aluminum, or coal dust.
4. 4. A return time transformer, as claimed in claim 1, in which the conductive element is provided between the butt legs of the cores, which are connected by the adhesive containing the conductive material.
5. 5. A return-time transformer, as claimed in claim 1, wherein the legs at the top of the cores, in a first connection portion, are connected to each other by an insulating adhesive; and the butt legs of the cores in a second connecting portion, are connected together by the adhesive containing the conductive material.
6. 6. A return time transformer, as claimed in claim 5, wherein an insulating element is supplied in the first connection portion and / or the second connection portion.