JPH0754992Y2 - Flyback transformer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an improvement of a flyback transformer used in a television receiver or a display device.

[Conventional technology]

A flyback transformer used in a television receiver or a display device has a circuit as shown in FIG. 9, in which a low voltage coil 2 is fitted in a core 1 and a high voltage coil 3 is fitted outside the low voltage coil 2. The low-voltage coil 2 and the high-voltage coil 3 are assembled together. The low-voltage coil 2 is constructed by winding a winding wire on a low-voltage bobbin, and the high-voltage coil 3 is generally a coil part 3a, a coil part 3b, and a coil part on the high-voltage bobbin via an interlayer paper.
It is formed by stacking and winding 3c.

FIG. 7 shows the mechanical structure of a general flyback transformer of this type. In the figure, the high pressure bobbin 6
A column 7 is provided on both ends of the column 7, and a terminal pin 8 is formed on the column 7. As described above, a plurality of layers of coil windings are wound around the winding drum portion of the high-voltage bobbin 6 via the interlayer paper.
b and 3c are connected to the winding end side of the coil on the lower layer side and the winding start side of the coil on the upper layer side by diodes 4a and 4b connected between the terminal pins 8. It is connected to the anode side of the high-voltage rectifier diode 5 connected between the pins 8. Engaging portions 21 are formed on both ends of the high pressure bobbin 6.

The high voltage lead (anode lead) 10 is fixed to a holder 11, and engaging claws 12 are formed on both ends of the holder 11 as shown in FIG. The high-voltage lead 10 is detachably attached to the high-voltage bobbin 6 via the holder 11 by engaging with the engaging portion 21 on the sixth side. The conductor portion 15 of the high-voltage lead 10 is connected to the high-voltage rectifier diode 5 via a cathode-side terminal pin 8 of the high-voltage rectifier diode 5 (a terminal pin on the opening end 9 side of the transformer case 13).
Connected to the cathode side of. The high-voltage coil 3 to which the high-voltage lead 10 is attached is housed in the transformer case 13 together with the core 1 and the low-voltage coil 2 with the anode side of the high-voltage rectifying diode 5 as the bottom side. The high voltage lead 10 is taken out of the case 13 through an insertion hole 14 provided on the bottom surface side of the transformer case 13 and connected to the anode (not shown) of the cathode ray tube. The high-voltage coil 3 housed in the transformer case 13 is embedded and fixed in the case 13 together with the high-voltage lead 10 by a casting resin (insulating resin).

[Problems to be solved by the device]

However, since the conventional flyback transformer has a structure in which the high-voltage lead 10 is mounted on the high-voltage bobbin 6 via the holder 11, the manufacturing process of the holder 11 necessary for mounting the high-voltage lead 10 is indispensable. In addition to increasing the manufacturing process of
However, there is a problem in that the material cost for this is extra and the device cost is also high.

Further, in this type of flyback transformer, the creepage distance from the high-voltage coil 3 to the transformer case outlet of the high-voltage lead 10 (the distance indicated by the broken line from the portion A to the portion B in FIG. 7) is small, so that the external However, there is a problem in that it is necessary to take troublesome measures such as increasing the dielectric strength of the cylindrical wall 16 of the insertion hole 14, for example.

The present invention has been made to solve the above-mentioned conventional problems, and the purpose thereof is to simplify the device manufacturing process by omitting the holder, and further, to exit the transformer case of the high voltage lead from the high voltage coil side. An object of the present invention is to provide an inexpensive flyback transformer that can secure a sufficient creepage distance up to.

[Means for Solving the Problems]

The present invention is configured as follows to achieve the above object. That is, according to the present invention, a winding wire is wound around a high pressure bobbin with the bottom side of the transformer case being one end side and the opening end side of the transformer case being the other end side in a transformer case having an insertion hole formed in the bottom side. A high voltage coil configured is housed, and a high voltage rectifier diode is connected between terminal pins formed at both ends of the high voltage bobbin with the terminal pin on the bottom side of the transformer case as the anode side. In the flyback transformer, the anode side of which is connected to the high voltage end of the winding of the high voltage coil, and the cathode side of which is connected to the high voltage lead inserted through the insertion hole of the transformer case. A holding part is formed at the end of the transformer to hold the high-voltage lead. Over de a plate piece-like partition wall fin for blocking contact between the winding region of the high-pressure coil is configured as characterized by being projected toward the open end side.

[Action]

In the present invention, the tip of the high-voltage lead inserted through the insertion hole of the transformer case is fixedly held by the holding portion provided on the high-voltage bobbin on the open end side of the transformer case. In this fixed holding state, the partition wall fins prevent the high-voltage lead from the insertion hole to the holding portion from bending toward the high-voltage bobbin side, and contact between the high-voltage lead and the winding region of the high-voltage bobbin is prevented.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. In the description of the present embodiment, the same reference numerals will be given to the same structural parts as those of the conventional example, and the duplicated description will be omitted.

FIG. 1 shows the mechanical structure of a flyback transformer according to the present invention. This embodiment is different from the conventional example in that the high-voltage lead 10 does not require any holder.
Is attached to the high pressure bobbin 6.

That is, the holding portion 17 is provided at the end of the high pressure bobbin 6 on the opening end 9 side of the transformer case 13, and the holding portion 17 is provided.
The insertion tip of the high-voltage lead 10 is held by. The holding portion 17 may have any form as long as it has a function of holding from the outside of the high voltage lead 10, for example, FIG. 4 (a).
As shown in FIG. 4, a pair of holding pieces 18a, 18b are provided so as to project from the high-pressure bobbin 6, and the high-voltage lead 10 is held between the holding pieces 18a, 18b, or as shown in FIG. 4 (b).
As shown in Fig. 5, a biting claw 19 is provided on the inner peripheral surface of the ring 22, and the biting claw 19 is bited into the insulating layer of the high voltage lead 10 inserted in the ring 22 to hold the high voltage lead 10. can do.

As shown in FIGS. 1 and 2, from the end edge portion of the insertion hole 14 of the transformer case 13, in order to avoid contact between the high voltage lead 10 inserted through the insertion hole 14 and the winding region of the high voltage bobbin 6. A plate piece-shaped partition fin 20 is provided so as to project toward the front end 9 side. The partition fin 20 is provided between the high-voltage lead 10 and the high-voltage bobbin, and the partition fin 20 has a shape slightly curved in the same direction as the circumference of the high-voltage lead 10 as shown in FIG. Has become. In the present embodiment, the protruding length of the partition fin 20 is approximately half the length of the high pressure bobbin 6.

According to the present embodiment, the high-voltage lead 10 is held by the holding portion 17 provided on the high-voltage bobbin 6, so that the holder 11 which is always necessary in the conventional apparatus is unnecessary,
As a result, the device manufacturing process can be greatly simplified. In addition, the material of the holder 11 can be saved, so that the efficiency of the manufacturing work and the reduction of the device cost can be significantly achieved.

When the transformer case 13 is not provided with the partition fin 20, as shown in FIG. 6, the high-voltage lead 10 is flexibly deformed to come into contact with the winding region of the high-voltage bobbin 6, but there is a problem.
By providing the partition fins 20 as in the present embodiment, such contact can be completely avoided, and the problem of withstand voltage between the high voltage lead 10 and the winding region of the high voltage bobbin 6 can be effectively solved.

Further, in the present embodiment, by omitting the holder 11 of the conventional example, the creepage distance becomes very long from the holding portion 17 to the outlet of the insertion hole 14, therefore, the cylinder wall 16 of the insertion hole 14 is lengthened, etc. This eliminates the need for a special device for increasing the withstand voltage with respect to the outside, facilitating the manufacturing of the device and further increasing the safety with respect to the withstand voltage.

It should be noted that the present invention is not limited to the above-mentioned embodiment, and various embodiments can be adopted. For example, in the above embodiment,
The partition fin 20 is formed in a curved shape.
As shown in the figure, it may be a straight plate having no curvature.

The length of the partition fin 20 does not necessarily have to be half the length of the high pressure bobbin 6, and may be any length as long as it can prevent the high voltage lead 10 from bending and coming into contact with the winding region of the high pressure bobbin 3. Good.

[Effect of device]

Since the present invention is configured to hold the high-voltage lead by the holding portion provided on the high-voltage bobbin, the holder for mounting the high-voltage lead, which is essential in the flyback transformer of the conventional example, is not required, and thus the device It is possible to achieve a great simplification of the manufacturing process and material saving, and it is possible to significantly improve the efficiency of manufacturing the device and reduce the cost of the device.

Further, since the partition fins are provided to prevent the contact between the high-voltage lead and the winding region of the high-voltage coil, it is possible to avoid a problem in the dielectric strength due to the contact between the high-voltage lead and the winding region of the high-voltage coil.

Further, as described above, since the high-voltage lead is held by the holding portion of the high-voltage bobbin, the creepage distance from the high-voltage coil to the transformer case outlet of the high-voltage lead can be made sufficiently long, and the safety and reliability in using the device can be improved. The sex can be effectively improved. Moreover, in the present invention, since the partition fins that prevent contact between the high voltage lead and the winding area of the high voltage coil are formed in a plate piece, the high voltage coil holding the high voltage lead is housed in the transformer case. When casting the casting resin, the sneaking of the casting resin to the high-voltage lead side is not damaged, and the high-voltage lead and the high-voltage coil are both embedded and fixed by the casting resin in a single casting operation. As a result, the dielectric strength of the high voltage lead against external discharge is perfect.

[Brief description of drawings]

FIG. 1 is a mechanical structural view showing an embodiment of a flyback transformer according to the present invention, FIG. 2 is a sectional view of a transformer case which constitutes the same embodiment, and FIG. 3 is a view taken in the direction of arrow A in FIG. , 4th
FIG. 5 is an explanatory view showing various forms of the holding portion formed on the high-pressure bobbin, FIG. 5 is an explanatory view showing another form of the fin of the partition wall, and FIG. 6 is an explanation showing a defective state when the fin of the partition wall is not provided. FIG. 7 is a mechanical structure diagram of a general flyback transformer of a conventional example, FIG. 8 is an explanatory diagram showing an example of attachment of a high voltage lead to a high voltage bobbin in a conventional flyback transformer, and FIG. 9 is a fly. It is a general circuit diagram of a back transformer. 1 ... Core, 2 ... Low-voltage coil, 3 (3a, 3b, 3c) ... High-voltage coil, 4a, 4b ... Diode, 5 ... High-voltage rectifying diode, 6 ... High-voltage bobbin, 7 ... Strut, 8 ...... Terminal pin, 9 ...... Open end, 10 ...... High voltage lead, 11 ...... Holder,
12 …… engaging claw, 13 …… transformer case, 14 …… insertion hole,
15 ... Conductor part, 16 ... Tube wall, 17 ... Holding part, 18a, 18b
...... Clamping piece, 19 ...... Eating claw, 20 ...... Bulk fin, 21 ...
… Engagement part, 22 …… Ring.

Claims (1)

[Scope of utility model registration request] 1. A transformer case in which an insertion hole is formed on the bottom side, wherein the bottom side of the transformer case is one end side,
A high-voltage coil configured by winding a winding wire around a high-voltage bobbin with the open end side of the transformer case as the other end side is housed, and the bottom surface of the transformer case is provided between terminal pins formed at both ends of the high-voltage bobbin. Side terminal pin is connected to the anode side of the high voltage rectifying diode, the anode side of this high voltage rectifying diode is connected to the high voltage end of the winding of the high voltage coil, and the cathode side is to the high voltage lead inserted from the insertion hole of the transformer case. In the connected flyback transformer, a holding portion for holding a high-voltage lead is formed at the end of the high-voltage bobbin on the opening end side of the transformer case, and from the edge of the insertion hole of the transformer case. It is characterized in that a plate-shaped partition wall fin that blocks contact between the high-voltage lead and the winding region of the high-voltage coil is provided so as to project toward the opening end side. Flyback transformer that.