JPH0447933Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to a flyback transformer device used in television receivers and the like. In particular, the present invention relates to a flyback transformer device integrated with a variable resistor for supplying focus voltage and screen voltage to a cathode ray tube.

(b) Prior Art Figures 1 and 2 show a conventional flyback transformer device. 1 is an insulating case for the flyback transformer main body in which coil parts (not shown) are stored; 2 is a variable resistor attached to the case 1; 3 is a ferrite core that forms a magnetic path; 4 is a high-voltage lead wire , 5 are external connection pins provided on the coil component.

As shown in FIGS. 3 to 5, the variable resistor 2 is connected to a focus voltage adjustment rotating shaft 6.
and a screen voltage adjustment rotating shaft 7, and the focus voltage and screen voltage adjusted by the rotating shafts 6 and 7 are drawn out through a focus output lead wire 8 and a screen output lead wire 9, respectively.

In this conventional example, each output lead wire 8, 9 is
Since the output is led to the outside through through holes 11, 11 provided in the upper end surface 10a of the case 10 of the variable resistor 2, the thickness l of the case 10 is sufficiently larger than the wire diameter of each output lead wire 8, 9. Must. Therefore, when the variable resistor 2 is mounted in the insulating case 1, the flyback transformer device becomes large.

(c) Purpose of the invention In other words, the case 10 becomes thicker and the variable resistor 2
This hinders the reduction in the thickness of the flyback transformer itself, and when the case 10 is attached to the insulating case 1 of the flyback transformer body and integrated, the distance between the two cannot be shortened, and the flyback transformer becomes smaller. I can't. In addition, an extra amount of molding resin is required to be filled into the interior by the thickness of the case 10, which has drawbacks such as an increase in the amount of resin used, an increase in cost, and an increase in the weight of the entire device.

Therefore, it is conceivable to simply provide a U-shaped notch in the large opening end of the lower part of the flyback transformer main body case 1, and to draw out each output lead wire from this U-shaped notch. However, as a matter of course, a simple U-shaped cutout has the disadvantage that the output lead wire is not fixed, and therefore reliability is reduced due to proximity to nearby electrodes, etc.
(See No. 129581).

For this reason, the lead wire must also be guided to the outside through the through hole. However, the work of passing each output lead wire 8, 9 through is very complicated, and the assembly work is difficult.

SUMMARY OF THE INVENTION An object of the present invention is to overcome the above-mentioned drawbacks and to provide a flyback transformer device that is small in size and easy to assemble.

(d) Structure of the invention In the present invention, a U-shaped double wall 15 forming a U-shaped fitting groove 16 is provided in an insulating case 12 in which a coil component is housed, and a high voltage is applied to the U-shaped fitting groove 16. This insulation case 12 is fitted with the U-shaped frame portion 27 of the variable resistor 17.
A combined case 28 is formed by the high voltage variable resistor 17 and the high voltage variable resistor 17, and an insulating resin 43 is injected and hardened into the combined case, and the coil component and the high voltage variable resistor 17 are injected and hardened.
In the flyback transformer device, the ceramic substrate 22 of the high voltage variable resistor 17 is molded with resin.
In order to lead out the output lead wires 25, 26 and the output lead wires 25, 26 to the outside of the combined case, the U-shaped frame portion 27
The first U-shaped notches 31 and 32 are provided in a portion located at the large opening end 29 of the combined case, and the U-shaped double wall 15 is provided in a portion of the U-shaped double wall 15 facing the first U-shaped notch. When the insulating case 12 and the high voltage variable resistor 17 are combined, the first U
The output lead wire 2 together with the character-shaped notches 31 and 32
a second U-shaped notch 44 for holding the parts 5 and 26;

(E) Embodiment An embodiment will be described below with reference to the drawings, and common parts will be given the same drawing numbers.

Figures 6 to 12 show a first example of a flyback transformer for explaining the present invention, and show an insulating case 1 in which coil parts (not shown) are housed.
2 is provided with a variable resistor mounting portion 13 as shown in FIG. This mounting part 13 has an outer wall 14a.
A U-shaped double wall 15 consisting of an inner wall 14b and an inner wall 14b.
A U-shaped fitting groove 16 is formed by the double wall 15. 13a is a notch provided in the mounting portion 13.

7 to 9 show a variable resistor 17 for taking out the focus voltage and screen voltage.

Reference numerals 18 and 19 denote a focus voltage adjustment rotation shaft and a screen voltage adjustment rotation shaft, which are rotatably attached to the bottom 21 of the case 20 of the variable resistor 17, respectively. Inside the case 20 is housed a ceramic substrate 22 on which a resistor is printed and fired. An input lead wire 23 for inputting DC voltage from a coil component and a grounding lead wire 24 are drawn out to this board 22, as well as a focus output lead wire 25 for outputting a focus voltage and a screen voltage output for outputting a screen voltage. Lead wire 26
is drawn out.

The input lead wire 23 and the grounding lead wire 24
After being integrated as a flyback transformer device, it is completely molded with resin, so it is a bare conductor. Since each of the output lead wires 25 and 26 is led out to the outside, thick coated conductive wires are used.

The variable resistor 17 can be attached to the insulating case 12 by fitting the U-shaped frame portion 27 of the case 20 into the U-shaped fitting groove 16 of the mounting portion 13 of the insulating case 12. As a result, a combined case 28 as shown in FIGS. 10 to 12 is formed. A frame piece 30 formed in a portion of the case 20 of the variable resistor 17 located on the large opening end 29 side of the combined case 28 is provided with a substantially U-shaped first notch 31; The screen output lead wire 26 is led out to the outside of the combined case 28 via this first notch 31. Further, the focus output lead wire 25 is led out through a substantially U-shaped second notch 32 provided in a portion of the U-shaped frame portion 27 of the case 20 located on the large opening end 29 side of the combined case 28. It is becoming more and more common. This second notch 32 is open on the side where it is attached to the insulating case 12, but the part of the double wall 15 of the attaching part 13 of the insulating case 12 where the second insulating notch 32 is located is cut out. When the attachment is completed, the removed portion 33 of the double wall (see FIG. 6) closes the opening side of the second notch 32 and holds the focus output lead wire 25. FIG. 11 clearly shows the holding state.

Note that the tongue piece 34 provided on the case 20 of the variable resistor 17 is for guiding the screen output lead wire 26. A pair of holding arms 35 provided on the outer wall 14a of the double wall 15 of the insulating case 12
The projecting piece 36 is for guiding each output lead wire 25, 26 in the direction in which the high voltage lead wire 37 extends and holding it in that state.

In addition, in the figure, 38 is a ferrite core forming a magnetic core. Reference numeral 39 denotes a terminal board portion which forms part of the coil component and has external connection pins 40 implanted therein. Reference numeral 41 denotes a hollow portion provided in the mounting portion 13 to improve the heat dissipation effect. 42
is an engagement piece for engaging with the printed board when it is attached to the printed board. Reference numeral 43 denotes an insulating resin such as epoxy that is injected into the combined case 28 and then hardened in order to mold the variable resistor 17, coil parts, etc. into resin.

If the focus and screen output lead wires 25 and 26 are led out from the combined case 28 as described above, compared to the case where a through hole is provided in the case of the variable resistor and the wires are led out through the through hole,
The thickness of the variable resistor 17 can be reduced. Therefore, the flyback transformer device in which the variable resistor 17 is integrally attached to the insulating case 12 can not only be miniaturized, but also be easily assembled. Further, as the size is reduced, the amount of insulating resin 43 used can be reduced, which is advantageous in terms of cost.

13 to 15 show a second example of a flyback transformer for explaining the present invention,
In this case, U-shaped first and second notches 31 and 32 are provided at both ends of the U-shaped frame portion 27 of the variable resistor 17 (the second notch 31 is not shown). In addition, similar notches are provided in the double wall 15 of the insulating case 12, and each output lead wire 2 is provided with a similar cutout.
5 and 26 are derived in opposite directions. In the case of this second example, even if the output lead wires 25 and 26 are made of a hard material and are difficult to bend, they can be easily led out.

16 to 18 show a third example of a flyback transformer for explaining the present invention,
In this example, first and second notches 31 and 32 from which the output lead wires 25 and 26 are led are provided in the frame piece 30 of the variable resistor 17. In this case, in addition to the tongue piece 34, another tongue piece 34' is provided for guiding the focus output lead wire 25.

FIGS. 19 and 20 are diagrams for explaining the features of the present invention. In this embodiment, the variable resistor 17
The positions of the openings of the first and second notches 31 and 32 (the second notch 32 is not shown) provided in the U-shaped frame portion 27 of the case and the notch 44 provided in the double wall 15 of the insulating case 12 When the variable resistor 17 is installed, the combination of the first and second notches 31, 32 and the notch 44 connects the output leads 25, 26 (output lead wire 25 is not shown). figure〕
Since the lead wires 25 and 26 are held so as to surround them, the holding power of the lead wires 25 and 26 is strengthened.

(f) Effects of the invention According to the invention, the case 20 of the high voltage variable resistor 17 itself can be made thinner, and when the high voltage variable resistor 17 is combined with the case of the main body of the flyback transformer, the distance between the two can be reduced. shortening the distance between
I can do it.

Furthermore, by making the case 20 thinner, the amount of molding resin to be filled can be reduced, reducing costs and reducing the weight of the flyback transformer device by eliminating the resin.

Furthermore, the U-shaped notch allows for
Since the lead wire is drawn out, the structure is simplified.

Furthermore, there is no need to insert lead wires into holes, which simplifies assembly work.

Furthermore, the lead wire is held by the high voltage variable resistor 1.
7 can be done at the same time when it is assembled into the main body case of the flyback transformer, so there is no need for extra work.

As described above, according to the present invention, there is an advantage that the flyback transformer device to which the high voltage variable resistor is integrally attached can be miniaturized and its assembly can be easily performed.

[Brief explanation of the drawing]

1 and 2 are diagrams showing a conventional flyback transformer device. Figures 3, 4, and 5 are diagrams showing parts used in a conventional flyback transformer device, in which Figure 3 is a front view, Figure 4 is a plan view, and Figure 5 is a side view. are shown respectively. 6th
12 are diagrams showing a first example of a flyback transformer for explaining the present invention, and FIG.
The figure shows the insulating case, Figure 7 is the front view of the variable resistor, Figure 8 is its side view, Figure 9 is its back view, Figure 10 is the front view of the flyback transformer, and Figure 11. is its side view, and FIG. 12 is its bottom view. 13 to 15 show a second example of a flyback transformer for explaining the present invention, in which FIG. 13 is a front view of the flyback transformer device, FIG. 14 is a side view thereof, and FIG. FIG. 15 is a diagram showing parts used therein.
16 to 18 show a third example of a flyback transformer for explaining the present invention, in which FIG. 16 is a front view of the flyback transformer device, FIG. 17 is a side view thereof, and FIG. FIG. 18 is a diagram showing parts used therein. Figure 19 and 2
Figure 0 is a diagram showing the features of the present invention. 12... Insulation case, 15... U-shaped double wall,
16... U-shaped fitting groove, 17... High voltage variable resistor, 22... Ceramic substrate, 25... Focus output lead wire (output lead wire), 26... Screen output lead wire (output lead wire), 27...
U-shaped frame portion, 28... combined case, 29... large opening end, 31... first notch (first U-shaped notch), 3
2... Second notch (first U-shaped notch), 43... Insulating resin, 44... Notch (second U-shaped notch).

Claims (1)

[Claim for Utility Model Registration] An insulating case 12 in which a coil component is housed is provided with a U-shaped double wall 15 forming a U-shaped fitting groove 16, and a high voltage variable resistor is installed in the U-shaped fitting groove 16. This insulation case 12 is fitted with the U-shaped frame portion 27 of the container 17.
A combined case 28 is formed by the high voltage variable resistor 17 and the high voltage variable resistor 17, and an insulating resin 43 is injected and hardened into the combined case, and the coil component and the high voltage variable resistor 17 are injected and hardened.
In the flyback transformer device, the ceramic substrate 22 of the high voltage variable resistor 17 is molded with resin.
In order to lead out the output lead wires 25, 26 and the output lead wires 25, 26 to the outside of the combined case, the U-shaped frame portion 27
first U-shaped notches 31 and 32 provided in a portion located at the large opening end 29 of the combined case, and provided in a portion of the U-shaped double wall 15 facing the first U-shaped notch, When the insulating case 12 and the high voltage variable resistor 17 are combined, the first U
The output lead wire 2 together with the character-shaped notches 31 and 32
2. A flyback transformer device comprising: a second U-shaped notch 44 for holding the parts 5 and 26;