JPS6031091B2 - flyback transformer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flyback transformer for extracting high voltage supplied to a cathode ray tube, etc. of a TV receiver, and a high voltage variable resistor for extracting medium to high voltage such as a focus voltage supplied to a cathode ray tube. This relates to a flyback transformer that is integrally equipped with a transformer.

A conventional flyback transformer that is equipped with a high-voltage variable resistor has a cutout in the wall of the case in which the low-voltage coil and high-voltage coil are loaded, and the high-voltage variable resistor is installed in this cutout. However, with this structure, an insulating material such as epoxy resin is injected into the case and then hardened, so the case wall is cut to prevent leakage when the insulating material is injected. A sealing member such as packing must be used between the notch and the resistor.

Therefore, since extra parts such as packing are required, the cost increases and the assembly work becomes complicated. The present invention has been made in view of these points, and is a flyback that prevents leakage when insulating material is injected without using extra members such as packing, thereby simplifying assembly work. The purpose is to provide transformers.

An embodiment of the present invention will be described in detail below with reference to the drawings. Figures 1 and 2 are a front view and a side view of the flyback transformer, respectively, and in these figures, 1
The first case is made of insulating material and is closed on one side, and the second case is this case! This is a closed magnetic path type core provided through the bottom surface, and is formed by a pair of U-shaped cores 3 and 4 that are butted against each other and fixed with fixing fittings 5 and 6.

Although not shown, a low-voltage coil and a high-voltage coil are wrapped around the legs of the core 2 inside the case 1, and the cavity inside the case is filled with an insulating material such as epoxy resin. The structures of these low-voltage coils and high-voltage coils include split-wound ones using a split-type bobbin that has multiple winding grooves on the circumferential surface, and solenoid-wound ones that use a bobbin that does not have multiple winding grooves on the circumferential surface. Any suitable item may be used, and in addition, case 1
A high voltage diode is also loaded inside and connected to the high voltage coil.
Direct current high voltage may be taken out directly. When connecting a high-voltage diode to a high-voltage coil, it can be connected only to the winding end of the high-voltage coil, or the high-voltage coil can be divided into a plurality of pieces and the plurality of diodes can be connected alternately. 7 is a high-voltage variable resistor fitted with iron in a □-shaped notch with one end open on the side wall of case 1, and is used to divide the output voltage from the high-voltage coil and extract medium-high voltage such as the focus voltage of a cathode ray tube. The adjusting droplet 8 is exposed to the outside.

A specific means for attaching this high-voltage variable resistor 7 to the first case 1 will be explained using FIGS. 3 to 7. Third
The figure is an enlarged perspective view showing only the main parts of the first case. In the figure, 9 is a square-shaped notch with one end open provided on the side wall of the case 1, and 10' is the entire external peripheral wall of the notch 9. This is a projecting wall with an L-shaped cross section provided along the projecting wall, and a side groove 11 is formed on the entire circumferential wall of the notch 9 from one side of the projecting wall.

In the part of the case 1 from the entrance to the bottom of the case 1, the part in the vertical direction excluding the bottom part of the matching groove 11 is tapered so that the bottom side of the case 1 becomes narrower. It is something. Note that in the above embodiment, a projecting wall with an L-shaped cross section was used to provide the saddle fitting groove 11, but if the wall thickness of the case is thick, the projecting wall of the case 1 with an L-shaped cross section may not be used. A matching groove may be provided directly in the wall surface of the notch 9. , FIGS. 4 to 7 are a side view, a top view, a back view, and an enlarged view of the main parts of the high-voltage variable resistor 7, respectively, and in these figures, 12 is a second insulating material.
In this case, the insulating substrate on which the film resistor of the desired shape is attached, the slider, and the flange part (none of which are shown) for attaching the information element provided at the tip of the adjustment unit 8 are housed. This constitutes a high voltage variable resistor.

13 is a peripheral wall portion of the second case 12, and a pair of projecting walls 14 and 15 are provided on the peripheral wall portion in the longitudinal direction.

The pair of projecting walls 14 and 15 have the same taper as the taper of the iron matching groove 11 provided in the notched peripheral wall portion of the first case 1, and the peripheral wall including the projecting crabs 14 and 15 The portion 13 is formed so as to be housed in the groove 11 of the first case 1. Note that recesses 16 and 17 are formed inside these projecting walls 14 and 15, respectively, and these recesses 16 and 17 are formed when the peripheral wall portion 13
When housed in the matching groove 11 of the case 1, even if the peripheral wall portion 13 has some warpage, the warp can be forcibly corrected. In other words, the recesses 16 and 17 easily twist because of their thin wall thickness, and therefore can easily compete with the groove 11 even if the linearity of the peripheral wall 13 in the longitudinal direction is somewhat impaired. However, this recess is not necessarily essential to the present invention. Reference numeral 18 denotes a linear protrusion provided on the entire circumferential wall portion of the second case 12 except for the upper end of the back surface, which connects the circumferential wall portion 13 of the second case 12 to the saddle fitting groove 11 of the first case 1.
It is preferably provided in a position that supports the wall surface of the case 1, that is, the side surface of the joint groove 11 when the case is housed in the case, and has a tapered shape as is clear from the enlarged view of FIG.

Note that although the linear protrusions 18 are provided on the back surface of the second case 12, they are not necessarily limited to the back surface and may be on the front surface side. Furthermore, this linear protrusion 18 is 1 in the illustration.
Although it is a book, it may be a plurality of two or more books provided substantially parallel to each other. Further, in the above embodiment, the projecting walls 14 and 15 of the second case 12 are provided with a taper corresponding to the drum groove 11 of the case 1.
, 15 may not be tapered, but the linear protrusions 18 may be tapered. In short, as shown in FIG. 7, the combined width of the projecting walls 14, 15 and the linear protrusion 18, that is, the thickness A of the peripheral wall 13, is equal to the width B of the mating groove 11 of the case 1 shown in FIG. It is only necessary that they be formed so that they are located at corresponding positions and are somewhat larger. The first case 1 and the second case 12 in the present invention are constructed as described above, and when mounting the high voltage variable resistor 7 to the case 1, the tapered peripheral wall portion of the second case 12 is 13 is inserted through the opening on the wide side of the joint groove 11 of the first case.

At this time, the saddle mating register 1
Since there is a sufficient margin between the width B of the second case 11 and the thickness A of the peripheral wall of the second case 12, the second case 12 can be inserted easily. When the thickness A of the peripheral wall portion becomes substantially equal to the thickness A of the circumferential wall portion, the device will not be inserted any further unless a pressing force is applied. Therefore, when a force is applied to the second case 12 in the direction of inserting it into the adjacent groove 11, the entire linear protrusion 18 of the second case 12 is crushed, or the joining groove 11 is The second case 12 is in a state where it is pushed apart and the side groove 11
It will be inserted up to the predetermined position. In other words, if a relatively soft resin such as Noryl resin is used for the second case 12, and a relatively hard resin such as polybutylene terephthalate resin is used for the first case 1, the linear projections 18 will be in a crushed state. Therefore, if a relatively hard resin such as polybutylene terephthalate resin is used for the second case 12 and a relatively soft resin such as Noryl resin is used for the first case, the width of the groove 11 will be expanded. If the hardness of the materials of both cases is not significantly different, the above two types of conditions coexist, and in either case, the peripheral wall portion 13 of the second case 12 This means that the entire area is fitted in the fitting groove 11 in a pressure saddle manner. Since the flyback transformer of the present invention is constructed as described above, it is possible to prevent leakage of the insulating material without using conventional sealing parts such as packing, which is advantageous in terms of cost, and is suitable for high voltage applications. When attaching the variable resistor to the first case, it is only necessary to apply a slight pressing force to the second case constituting the high-voltage variable resistor, which simplifies the assembly work.

In addition, if it is necessary to inject insulating material into the second case that constitutes the high-voltage variable resistor, if the second case is closed at the bottom, the insulating material can be injected into the first case. can be processed simultaneously during injection, further simplifying the overall process.

[Brief explanation of the drawing]

FIG. 1 is a front view of a flyback transformer according to an embodiment of the present invention, FIG. 2 is a side view thereof, and FIG. 3 is an enlarged perspective view of the first essential part constituting the flyback transformer of the present invention. FIG. 4 is a side view of a high-voltage variable resistor used in the flyback transformer of the present invention, FIG. 5 is a plan view thereof, FIG. 6 is a rear view thereof, and FIG. 7 is a partially enlarged view thereof. 1...First case, 2...Closed magnetic circuit core, 3, 4...
... U-shaped core, 5, 6 ... Fixing bracket, 7
...High voltage variable resistor, 8...Adjustment knob, 9
...Notch, 10...Protruding wall, 11...
... Iron groove, 12 ... Second case, 13
...... Peripheral wall portion, 14, 15... Projection wall, 16,
17...concavity, 18...striate protrusion. Figure 1 Figure 5 Figure 2 Figure 3 Figure 4 Figure 6 Figure 7

Claims (1)

[Claims] 1. A low voltage coil and a high voltage coil wound around a core are loaded in a first case having an opening on one side, and a second case is provided in a notch with an opening at one end provided in the wall of the case. The first case is provided with a fitting groove along the entire circumferential wall of the notch. In addition, the fitting groove extending from the case opening toward the bottom surface is tapered so that the bottom surface side becomes narrower, and the second case of the high voltage variable resistor has a fitting groove extending from the case opening toward the bottom surface. A linear protrusion is provided at a position corresponding to the side surface of the fitting groove of the case, and the thickness of the portion of the peripheral wall including the linear protrusion corresponding to each position of the fitting groove of the first case is equal to the thickness of the fitting groove of the first case. The fitting groove is formed to be somewhat larger than the width of the fitting groove, so that the entire peripheral wall portion of the second case is press-fitted to the fitting groove of the first case. flyback transformer.