JPS6219110Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a flyback transformer that divides a high-voltage coil and connects a rectifier between the divided coils.It aims to reduce the number of man-hours in the manufacturing process and stabilize quality by preventing disconnection, and further improves the quality of the rectifier. The purpose is to facilitate repair in the event of defects or failures.

As shown in Fig. 1, recent flyback transformers include a low-voltage coil 1 and a high-voltage coil 2 divided into many parts, and a diode 3 is connected in series between the divided high-voltage coils 2. In many cases, a flyback transformer 5 is constructed by incorporating a magnetic core 4 into both coils 2, 2, and the high voltage output of the high voltage coil 2 is applied to the cathode ray tube 7. Note that 6 in the figure indicates the distributed capacitance.

As shown in FIGS. 2 and 3, a conventional flyback transformer of this type has a low-voltage coil 9 wound around a split bobbin 8, and then a high-voltage coil 10 split into windings to separate the low-voltage coil 9 and the high-voltage coil. The lead wire 10 is wrapped around the terminal pin 11 or 12 and soldered in the latter half, and the diode 13 is inserted into the groove of the split bobbin 8 and then the lead wire is connected to the terminal pin 12, 1.
2' and soldered.

The anode cap lead wire 14 is also soldered to the terminal pin 12'.

After these operations are completed, the core 15 and the fastening fittings 16 are assembled and attached to the split bobbin 8, the insulating case 17 is covered, the bottom plate 18 is attached, and the insulating material 19 is poured into the casting hole 20. It was injected and completed.

According to this configuration, after winding the high-voltage coil 10 and wiring the lead wires, the installation of the diode 13 is often done manually, resulting in quality problems such as breaking the lead wires of the high-voltage coil 10 when installing the diode 13 and winding the lead wires. It causes defects and is difficult to automate assembly. Furthermore, since the diode 13 itself is cast with insulating material 19, even if a defect is discovered during the final inspection or a failure occurs in the process after delivery to the user, the diode 13
It is impossible to replace the flyback transformer itself, and the flyback transformer itself must be disposed of as a defective product.

The present invention eliminates the above-mentioned drawbacks of the conventional technology, and incorporates a printed circuit board incorporating a diode into a coil bobbin wound with a low-voltage coil and a high-voltage coil, and uses this printed circuit board to connect the transformer section and diode section. The purpose is to measure the ease of repair of the diode by separating it.

Embodiments of the present invention will be described below with reference to FIGS. 4 to 8.

21 has openings 22a and 22b on the bottom and part of the sides.
This is a cylindrical insulating case with a protrusion 23 on the other side of the case, and the cylindrical part 2 of this insulating case 21
4 houses a divided bobbin 27 equipped with a low-voltage coil 25 and a high-voltage coil 26 wound in multiple parts, and this divided bobbin 27 has a U-shaped magnetic core 28
is incorporated and fixed with a fastening fitting 29. A portion of this magnetic core 28 is adapted to fit into a protrusion 23 of the insulating case 21.

In addition, several terminal pins 31 are implanted in the collar 30 at the lower end of the split bobbin 27 in a direction parallel to the axial direction of the split bobbin 27, that is, projecting downward.
2. Terminal pins 34 protruding in the outer diameter direction are implanted in a part of the circumferential surface of the upper end collar 33, and the terminal pins 31 have the lead wire of the low voltage coil 25 and the lead wire of the high voltage coil 26 at the beginning of winding. connected, terminal pin 3
The lead wires of the high-voltage coil 26 are connected to the coils 4 by winding and soldering, respectively.

This terminal pin 34 is located in the opening 22b on the side surface of the insulating case 21, and a printed circuit board 36 having a plurality of diodes 35 connected by soldering is incorporated into this terminal pin 34. 34 are connected and coupled by solder. The printed circuit board 36 incorporated in this manner closes the opening 22b on the side surface of the insulating case 21.

Also, an opening 22b on the side of this insulating case 21
An L-shaped engagement protrusion 37 is provided at a position close to the engagement protrusion 37, and the engagement protrusion 37 has a U-shaped cross section and has engagement pieces 38 bent inward at both ends thereof. The cover 39 is slid and assembled from above.

Note that an anode cap lead wire 40 is connected to the terminal pin 34 of the upper end collar 33 of the split bobbin 27.

Further, a cover plate 41 is incorporated into the opening 22a on the bottom surface of the insulating case 21, and this cover plate 41 has an injection port 4.
2 is provided, and an insulating resin 43 is filled only into the transformer portion from this injection port 42.

Since the flyback transformer of the present invention is constructed as described above, the diode can be installed on the printed circuit board, and after assembling the transformer part,
Since the printed circuit board is embedded and connected to the terminal pins of the transformer, it is possible to automate the assembly, greatly improving productivity. There is no risk of wire breakage, and quality can be improved.

In addition, only the transformer part is molded with insulating resin, and the diode part can be easily replaced even if it breaks down by removing the cover, making it possible to repair the product. It also has the advantage of being easy to maintain and highly practical, and is of great practical value.

[Brief explanation of the drawing]

Fig. 1 is an electrical circuit diagram of a recent flyback transformer, Fig. 2 is a top view of a conventional flyback transformer, Fig. 3 is a sectional front view of the same, and Fig. 4 is an embodiment of the flyback transformer of the present invention. 5 is a side view of the same, FIG. 6 is a sectional front view of the same, FIG. 7 is an enlarged sectional view of the essential parts, and FIG. 8 is a side view of the essential parts of the diode section. . 21...Insulating case, 22a, 22b...Opening, 23...Protrusion part, 24...Cylindrical part, 25...
Low voltage coil, 26...High voltage coil, 27...Divided bobbin, 28...Magnetic core, 29...Tightening metal fitting, 30
...Lower end flange, 31...Terminal pin, 32...Middle tsuba, 33...Upper end tsuba, 34...Terminal pin, 35...
...Diode, 36...Printed circuit board, 37...
Engagement protrusion, 38...Engagement piece, 39...Cover, 4
0... Anode cap lead wire, 41... Lid plate, 42... Inlet, 43... Insulating resin.

Claims (1)

[Scope of utility model registration request] A flyback transformer has a low-voltage coil and a divided high-voltage coil, each coil has a built-in magnetic core, and is housed in an insulating case, and a diode is connected between the divided high-voltage coils. An opening is provided in a part of the side of the case,
In this opening, place a terminal pin that is embedded in the collar of a split bobbin around which a high voltage coil is wound and connect the lead wire of the high voltage coil, and place a printed circuit board with a diode attached to the terminal pin so as to close the side opening of the insulating case. A flyback transformer that is assembled into the insulating case, filled with insulating resin, and has a cover removably placed over the diode part.