JPH0550842B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention pertains to a flyback transformer used in a television receiver.

Configuration of the conventional example and its problems The conventional example will be explained below with reference to the drawings.
1 to 4 show the structure of a conventional flight back transformer.

In Figures 1 to 4, 1 is a high pressure bobbin, 1a
2 is a high-voltage coil, 3 is a core, 4 is a low-pressure bobbin, 4a is a protrusion provided on the outer circumferential surface of the low-pressure bobbin 4, 4b is a collar of the low-pressure bobbin 4, and 5 is a protrusion provided on the inner circumferential surface of the high-pressure bobbin 4. It is a low voltage coil.

The flyback transformer constructed as described above will be explained below.

Conventionally, in this type of flyback transformer, a low pressure bobbin 4 is inserted into a hollow part of a high pressure bobbin 1 having a hollow structure as shown in FIG. The protrusion 1a of the high-pressure bobbin 1 and the protrusion 4a of the low-pressure bobbin 4 were fitted into each other in a state of contact, and the structure was such that they were integrated. Therefore, the collars 4b of the high-voltage bobbin 1 and the low-voltage bobbin 4 are in contact with each other, and the creepage distance between the high-voltage coil 2 and the low-voltage coil 5 is short.

Furthermore, since the protrusion 4a of the low pressure bobbin 4 engages and fits onto the upper surface of the protrusion 1a with respect to the protrusion 1a of the high pressure bobbin 1, the stress at the time of this fitting causes the high pressure bobbin to
is tilted with respect to the low-voltage bobbin 4, and the coupling between the high-voltage coil 2 and the low-voltage coil 5, which are coaxially arranged, is changed,
It also had the disadvantage that it could get caught and become difficult to assemble when the whole thing was housed in a case.

OBJECT OF THE INVENTION The present invention obviates the above-mentioned drawbacks.
The purpose of this is to ensure that the low-voltage bobbin and the high-voltage bobbin are always coaxially fitted together to obtain stable characteristics, and to provide a sufficient creepage distance between the high-voltage coil and the low-voltage coil.

Structure of the Invention In order to achieve this object, the present invention provides a low-voltage bobbin around which a low-voltage coil is wound, a high-voltage bobbin fitted on the outer peripheral surface of the low-voltage bobbin and around which a high-voltage coil is wound, and A core to be incorporated is provided, and a protrusion having a recess on the upper and lower surfaces of the central portion is provided on either the outer circumferential surface of the low-pressure bobbin or the inner circumferential surface of the high-pressure bobbin, and the other is fitted into the recesses on the upper and lower surfaces of the protrusion, respectively. Two protrusions are provided that face each other vertically and are spaced apart from each other by a certain distance.

With this configuration, the low-pressure bobbin and the high-pressure bobbin are always fitted coaxially, making it possible to provide a highly reliable flyback transformer.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

5 to 8, 1 is a high-pressure bobbin with a plurality of flanges, 1a is a protrusion provided on the inner peripheral surface of the high-pressure bobbin 1, and recesses 1b are provided on both sides in the height direction, that is, on the upper and lower surfaces of the central part. is provided. 2
are the high voltage coils wound around this high voltage bobbin 1, 3
4 is a core, 4 is a low-pressure bobbin having a structure in which a cylindrical portion is integrally provided at the terminal portion, and 4a and 4b are fixed portions on the outer peripheral surface of the low-pressure bobbin 4 so as to fit into the recesses 1b on the upper and lower surfaces of the protrusion 1a of the high-pressure bobbin 1. The protrusions 5 provided vertically opposite each other at intervals are low-voltage coils in which protrusions 4a and 4b are wound around the low-voltage bobbin 4 to regulate the winding width.

The flyback transformer constructed as described above will be explained below.

As shown in FIG. 5, the low pressure bobbin 4 is inserted into the hollow part of the high pressure bobbin 1, which has a hollow structure, and by rotating it in one direction, the two protrusions 4a and 4b of the low pressure bobbin 4 are attached to the high pressure bobbin 1. The protrusion 1a slides on its inclined surface and fits into the recess 1b provided on the upper and lower surfaces, thereby becoming integrated. By fitting the projections 4a and 4b into the upper and lower surfaces of the projection 1a, the high voltage bobbin 1 is coaxially connected to the low voltage bobbin 4, and the connection between the low voltage coil 5 and the high voltage coil 2 is also stabilized. , even when the assembly is stored in a case, it can be assembled without any problem.

Effects of the Invention As described above, in the present invention, the protrusion in the hollow part of the high pressure bobbin is fitted with the recess on the upper and lower surfaces of the protrusion and the outer circumference of the low pressure bobbin by two protrusions that face each other vertically with a constant interval between them. , the low-pressure bobbin and the high-pressure bobbin, in other words, the low-pressure coil and the high-voltage coil are placed on the same axis, and the degree of coupling between both coils is stable, resulting in constant performance and high quality, and the collar of the low-pressure bobbin is omitted. It is possible to reduce costs.

However, the creepage distance between the high-voltage coil and the low-voltage coil can be kept sufficiently long since they do not come into contact with each other through the flanges, and the effect of improving reliability can be obtained.

[Brief explanation of drawings]

Figure 1 is a sectional view of a conventional flyback transformer, Figure 2 is a perspective view of a low voltage coil used in the flyback transformer, and Figures 3a and 3b are explanations of the assembled state of the high voltage bobbin and low voltage bobbin. figure,
Fig. 4 is an exploded perspective view of the main parts of the flyback transformer, Fig. 5 is a sectional view showing an embodiment of the flyback transformer of the present invention, and Fig. 6 is a perspective view of the low voltage coil section used in the flyback transformer. Figures 7a and 7b are explanatory diagrams showing an assembled state of the low-pressure bobbin and high-pressure bobbin, and Figure 8 is an exploded perspective view of the main parts. 1...High pressure bobbin, 1a...Protrusion, 2...High voltage coil, 3...Core, 4...Low pressure bobbin, 4a,
4b...Protrusion piece, 5...Low voltage coil.

Claims (1)

[Claims] 1 A low-voltage bobbin around which a low-voltage coil is wound, a high-voltage bobbin fitted onto the outer periphery of the low-voltage bobbin and around which a high-voltage coil is wound, and a core incorporated into the low-voltage bobbin, the outer circumferential surface of the low-voltage bobbin and a protrusion having a concave portion on the upper and lower surfaces of the central portion is provided on one of the inner circumferential surfaces of the high-pressure bobbin, and on the other side, the protrusion is vertically opposed to each other with a certain interval to fit into the concave portions on the upper and lower surfaces of the protrusion, respectively. A flyback transformer with two protrusions.