JPS6251205A - flyback transformer - Google Patents

Abstract

PURPOSE:To keep the interval between a high voltage capacitor and its case constant and to avoid stress concentration owing to nonuniform sections of insulators, by integrally providing to the capacitor projections for fixing the capacitor to the case. CONSTITUTION:Two film projections 18, 18' with narrower widths than that of the capacitor are provided in ring shapes at both end sides of the cylindrical high voltage capacitor 7. The case 17 is provided with a coil housing section 17' and a high voltage capacitor housing section 17''. The inner diameter of the high voltage capacitor housing section 17'' is somewhat larger than the outer diameters of the projections 18, 18' of the high voltage capacitor. In this way, the high voltage capacitor 7 can contact the case through the projection 18, 18', and thus the high voltage capacitor 7 can be positioned at the center of the capacitor housing section 17''.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a flyback transformer that has a built-in high-voltage capacitor used in television receivers and the like. The present invention relates to improving the insulation of high-voltage capacitors.

[, Background of the invention]

, flyback transformers for television receivers, etc. are 2
A cathode ray tube that generates a high voltage of 0 to 30KV.

DC high voltage is supplied to the anode. Recently, in order to improve screen curvature (the high voltage load changes depending on the bright and dark areas of the screen, the voltage changes and the screen size changes, causing the 91 screen to appear curvy). In order to increase the capacitance of the Raun tube, a high voltage capacitor is attached and used.

5. The high-voltage sensor is built into the case of the flyback transformer because the anode voltage of the cathode ray tube is applied to it, and is integrated with the insulating material of the flyback transformer. The idea is to make it smaller by casting it and insulating it.

Figure 2 shows a flyback transformer and cathode ray tube.

It is a circuit diagram showing the connection of Takako condenser and su.

1 is a flyback transformer, a low voltage coil 2, a high voltage coil 3. It consists of diode 4, etc. Reference numeral 5 denotes a funnel tube, which is connected to the blade part 6 from the 6L7 life back transformer. A cathode ray tube is approximately 1000 to 200
07, which has a capacitance of 0PF, is a high-voltage capacitor for increasing the capacitance of the cathode ray tube, and is connected to the output section 6 of the flyback transformer 1 and connected in parallel with the cathode ray tube 5.

FIG. 5 shows a conventional example in which a high-voltage capacitor is built into a flyback transformer. The same parts as in Figure 2 are given the same symbols.

High voltage capacitor 7 is connected to high voltage side lead wire 8 and low voltage side IJ-)
Connect 1l19 to the output terminal 6 and low voltage side terminal 10 of the flyback transformer, insert it into the case 12 in the same way as the high voltage wire 11 connected to the output terminal B, and connect the flyback transformer with an insulator 13 such as epoxy. It is built into one unit and is insulated.

゛) This result output terminal 6. The high voltage electrodes such as the high voltage side lead wire 8 are sealed with the insulator 13.

Not only is insulation improved, but the size is also reduced.

By the way, the high voltage capacitor 7 is suspended in the air by the high voltage side lead 8 and the low voltage side lead wire 9, so the position inside the case 12 is not fixed due to the deformation of the lead wires 8 and 9, and the high voltage There was a risk of contact with the inner surface of the coil and the case 12, resulting in dielectric breakdown. In order to prevent this from happening, it was necessary to widen the case 12 to provide a larger storage space for the high voltage capacitor 7. If the storage space is expanded, there are problems in that the flyback transformer 1 becomes larger in size and the i of the insulator 13 increases, making it more expensive.

Furthermore, when the amount of the insulator 13 increases, stress such as thermal expansion and contraction around the high-voltage capacitor 7 becomes large, and the high-voltage capacitor 7
Stress is added to the surface, causing siflux, etc.

There is a high risk of dielectric breakdown. If the high-voltage capacitor 7 is fixed only with the lead wires 8.9, the high-voltage capacitor 7 will move and its position with the case 12 will not be determined and the thickness will be uneven, resulting in an even greater stress concentration.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a flyback transformer that solves the problems of the prior art.

[Summary of the invention]

The present invention solves the conventional problems by integrally providing a fixing protrusion for fixing the high-voltage capacitor 7 to the case 12, thereby making the distance from the case 12 constant.

[Embodiments of the invention]

The process of harvesting wild vegetables according to the embodiment of the present invention will be explained with reference to FIGS. 4 to 7. FIG. 4 is an explanatory diagram of a film capacitor using a film as a dielectric. 14 is a polyester film made of several layers stacked together. Aluminum 15 is vapor-deposited on some of the films 14' to serve as electrodes. Thus, the high-voltage capacitor 7 is formed. FIG. 5 is an explanatory view showing the high-voltage capacitor 7 of FIG. 4 stretched in the length direction.

By continuously depositing aluminum 15 on the film 14' so as to partially overlap with each other as shown in the figure, capacitors of C4 to C7 as shown in the lower part of the figure are formed. 8.9
is a lead wire, but this wire is made of annealed copper wire with a diameter of about 6 mm, and since it is difficult to connect to the vapor-deposited part of aluminum 15, aluminum foil 16 is sandwiched between both ends and welded to the aluminum foil 16. 4 Connected. The withstand voltage of the capacitor 7 is given by the withstand voltage of C4 to C7 in series. The capacitance of capacitor 7 is C4~
The value of C7 is better, and it is set to several hundred PF to several thousand PF according to the capacity of the cathode ray tube 5.

FIG. 6(A) is a perspective view of the capacitor of FIG. 5 wound into a cylindrical shape. Figure 6 (b) shows the same process as in (a) where a cylindrical capacitor is wound around both ends of the cylindrical capacitor.
Projections 1B and 1B' of the film are narrower than the width of the capacitor.
It is a perspective view which shows the state which provided in two places in the shape of a headband (ring shape). FIG. 6e] is a lateral view of the capacitor (b).

The capacitor 7 has a high voltage side lead wire 8 and a low voltage side lead wire 9.
is installed as shown in the figure. In this state, the capacitor 7 is immersed in an insulating material to impregnate the gap between the films with the insulating material and harden, thereby forming a high-voltage capacitor. FIG. 6) is a perspective view showing the state in which the capacitor 7 of (b) is molded flat and then subjected to insulation treatment. These f et al.
It can be changed freely depending on the relationship with the flyback transformer case.

The film protrusions 18, 1B' can be wrapped in the same way as the film wrapping of the capacitor 7, and the film impregnated with an insulating material is fixed to form an integrated structure.

FIG. 7(A) is a cross-sectional view showing a case 17 that houses the high-voltage capacitor 7 and the coil 3 provided with protrusions 18 and 1B'. The case 17 is provided with a coil housing section 17' and a high voltage capacitor housing section 17'. The inner diameter of the high-voltage capacitor storage portion 17' is the protrusion 1B of the high-voltage capacitor 7,
1 The outside diameter of the B' part is larger than the outside diameter.

FIG. 7(b) is a view of the case 17 viewed from below.

A groove 19 for passing the lead wire 8.9 of the high voltage coil 7 is provided between the coil housing portion 17' and the high voltage capacitor housing portion 17'. At part 419, the third part of the coil and the seventh part of the high voltage capacitor are connected.

FIG. 1 is a cross-sectional view showing an embodiment of the present invention, that is, a case 17 in which a coil and a high-voltage capacitor are integrally cast. In this way, high voltage capacitor 7
contacts the case at the ridges 18, 18', allowing the high-voltage capacitor 7 to be located in the center of the case 17'.

As a result, a uniform wall thickness can be ensured around the high voltage capacitor 7 without uneven thickness. The positioning of the high voltage capacitor 7 is determined by the protrusions 18 and 18', so the lead wire 8.
For 9, there is no problem with annealed copper wire.0 [Effects of the Invention] As mentioned above, in the present invention, a protrusion made of film is integrally provided on the outer periphery of a high-voltage capacitor made of film, and a high-voltage capacitor storage part is provided in the case of the flyback transformer. established,
By engaging the protrusion of the high voltage capacitor with this
A high voltage capacitor can be held in the center of the flyback transformer case.

For this reason, there is no need to enlarge the shape around the high-voltage capacitor, which not only allows for further downsizing, but also because there is no uneven thickness, it is less susceptible to the effects of stress due to thermal expansion and contraction, and insulation properties can be improved.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing one embodiment of the present invention, and FIG. 2 is a circuit diagram following the explanation of the flyback transformer. Figure 3 is a sectional view of a conventional flyback transformer, Figure 4, Figure s is an explanatory diagram of a film capacitor, Figure 6 (A) is a perspective view of a film capacitor, and Figure 6 (B). (/beginning) is a perspective view of the film capacitor of the present invention, No. 7
Figures (A) and (B) are cross-sectional views showing the case of the flyback transformer of the present invention. 0 1: Flyback transformer, 7: High voltage capacitor, 18
:Protrusion of high voltage capacitor, 17:7 life back transformer case, 17': Coil storage area, 171: Capacitor storage area Figure 7

Claims (1)

[Claims] A high-voltage capacitor is constructed by stacking multiple films, some of the films are provided with electrodes made of aluminum evaporation and aluminum foil, and these are wound into a roughly cylindrical shape. The film is wrapped like a headband in at least two places near both ends of the approximately cylindrical shape, insulated with resin, and then stored in the capacitor storage part provided in the flyback transformer case to connect the high-voltage coil. A flyback transformer characterized by being integrally insulated with an insulating material by casting.