JPH0110885Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high voltage variable resistor, such as a focus resistor used, for example, in a television receiver.

This type of resistor is shown in the conventional embodiment shown in FIGS. 1 to 3, in which 1 is a resistor 1c having a first circular portion 1a and a second circular portion 1b. and a first conductor 1e extending to the center part 1d of the first circular part 1a and extending to the center part 1f of the second circular part 1b for taking out the focus voltage obtained by the slider 2. 1 g of second conductor for taking out the screen voltage obtained by the slider 2
is printed on one side and is made of alumina or the like, and has silver as a main component on both ends of the resistor 1c, both ends of the first conductor 1e, and both ends of the second conductor 1g. There are connection parts 1h, 1i, 1j, 1k printed and baked with conductive paste.
External connection terminals 3a, 3b, 3c, and 3d are inserted into holes 1h', 1i', 1j', and 1k' formed in the holes 1h', 1i', 1j', and 1k', respectively, and connected with solder 9. Reference numerals 4 and 5 denote a rotation shaft for focus voltage adjustment and a rotation shaft for screen voltage adjustment, respectively, which are attached to an insulating case 6 so that a part of the shaft is exposed, and inside the case 6, the two sliders are installed. The resistor 1c
The first circular part 1a and the second circular part 1b are held so as to slide. The substrate 1 is formed with through holes 1l, 1m that fit into the two fixing ribs 6a, 6b provided on the case 6, and the substrate 1 is supported by the support portion 10, and the through holes 1l, 1m are formed in the substrate 1. The substrate 1 is placed in a predetermined position by fitting the two fixing ribs 6a, 6a into the substrate 1m, and the parts of the two fixing ribs 6a, 6a protruding from the substrate 1 are welded. is fixed to case 6. After that, the external connection terminal 3
a, 3b, 3c are insulating pin covers 7 as shown in the figure.
a, 7b, 7c and connected to rotating shafts 4, 5 attached to the case 6.
Predetermined portions (one not shown) are molded with resin 9 to insulate them, except for a space 8 including a sliding contact portion. In addition, the external connection terminals 3a, 3
Among b, 3c, and 3d, 3a is an input pin that inputs the high voltage output from the flyback transformer;
3d is a ground pin, 3b is a focus voltage output pin, and 3c is a screen voltage output pin, which are not shown because it is not necessary to normally provide a pin cover to the ground pin 3d.

Reference numeral 6c denotes a mounting portion integrally formed with the case 6, and the mounting portion 6c has a screw hole 6.
d and 6d are provided.

Now, when the conventional high voltage variable resistor 11 having such a configuration is incorporated into a television receiver,
Tapping screws are inserted into the holes 6d, 6d of the mounting portion 6c, and the mounting portion 6c is attached to a chassis mounting plate (not shown).

However, in order to incorporate such a conventional high-voltage variable resistor into a television receiver, it is necessary to prepare a mounting plate perpendicular to the chassis as described above, and the workability is not good because it is mounted using tapping screws.

The present invention proposes a high-voltage variable resistor devised to eliminate the above-mentioned drawbacks.
This will be explained with reference to FIGS. 8 to 8. Incidentally, the same components as in the prior art are given the same drawing numbers and their explanations will be omitted.

In the drawings showing an embodiment of the present invention, 4 and 5 are respectively rotary shafts for focus voltage adjustment and screen voltage adjustment that are rotatably attached to the bottom surface 12a of the case 12, and 2 and 2 are the rotary shafts 4 and 4, respectively. .
a, 12b. Connecting pins 13, 13 are inserted into the holes 1h', 1j' provided in the connecting parts 1h, 1j of the resistor 1c formed on the substrate 1, and are connected by soldering at the connecting parts 1h, 1j. On the other hand, an input terminal 14 and a focus voltage output terminal 15 are arranged parallel to the substrate 1, and one end is connected to the connection pin 13, 13, and the other end is connected to the pin cover part 12c, 12c integrally molded with the case 12. It is exposed to the outside of the case 12. In addition, in the holes 1i' and 1k' of the other connection parts 1i and 1k of the substrate 1, there are a ground terminal 16 which is an L-shaped external connection terminal having flanges 16a and 17a as shown in the figure, and a screen voltage terminal. One end of the output terminal 17 is inserted and connected by solder, and the other end is bent into an L shape so as to extend parallel to the substrate 1. Reference numeral 18 is a thermosetting resin and is applied inside the case 12 except for the space 19 between the bottom surface 12a of the case 12 and the substrate 1 to provide insulation. In addition, the ground terminal 1 of the case 12
An engaging piece 20 is integrally provided on the side from which the screen voltage output terminal 6 and the screen voltage output terminal 17 protrude.

Now, in order to attach the high voltage variable resistor of the present invention to the television receiver, please use the printed board 2 in advance.
While inserting the engaging piece 20 into the engaging hole 21a formed in the printed board 21, the ground terminal 16 and the screen voltage output terminal 17 are inserted into the predetermined holes 21b (one not shown) of the printed board 21. , both the terminals 16 and 17 are fixed to the printed board 21 by soldering as shown in FIG. Incidentally, since the screen voltage output appearing at the screen voltage output terminal 17 does not exceed 1500 volts at maximum, this is connected to the printed board 2 together with the ground terminal 16.
There is no problem in connecting directly to 1. Moreover, since the protrusions 22a, 22a are provided on both sides of the case 12 of the high voltage variable resistor 22 of the present invention, the ninth
As shown in the figure, the case 23 of the flyback transformer 23
a groove 23 that fits into the protrusions 22a, 22a;
It can be combined with the flyback transformer 23 by providing a housing portion 23c in which the cylindrical portions 23b and 23b are formed.

As described above, according to the high-voltage variable resistor of the present invention, one end of the high-voltage variable resistor is connected to the resistor provided on the board, and the other end is connected to the printed board with the external connection terminal extending parallel to the board. Since the engaging piece provided on the case of the high-voltage variable resistor engages with the printed circuit board, a mounting plate is provided on the chassis as in the past, and a tapping screw is attached to the mounting plate. It does not need to be fixed and can be directly fixed and connected to a printed board, so it has extremely high practical value.

Furthermore, since the insulating case 12 is provided with both the engaging piece 20 that engages with the printed board and the fitting means (projection) 22a that fits with the flyback transformer 23, it can be used both individually and in combination. .
In addition, the external earth connection terminal 16 is connected to the printed board side of the object to be attached, so that it can be used alone. And for this reason, when used in combination,
As shown in Japanese Utility Model Application Publication No. 55-88214, it is possible to output the output to the outside without having to do the troublesome process of connecting it to the terminal below the flyback transformer and then leading it out to the outside, so the device can be miniaturized. Assembly work can be simplified.

The focus voltage is derived from the opposite side (upper end) of the board from the ground, increasing safety against high voltages. Furthermore, the pin cover portion 12c around the focus voltage external connection terminal 15 from which this focus voltage is derived is integrally formed with the insulating case 12 to further improve insulation against high voltage.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a conventional high voltage variable resistor, Figure 2 is a perspective view of a conventional high voltage variable resistor.
The figure is a side sectional view thereof, and FIG. 3 is a plan view of the parts used. 4 and 5 are perspective views of the high voltage variable resistor of the present invention viewed from different directions, and FIG. 6 is a perspective view showing the inside of the high voltage variable resistor of the present invention,
FIG. 7 is a side cross-sectional view of the high-voltage variable resistor of the present invention, FIG. 8 is a partially sectional side view showing the high-voltage variable resistor of the present invention attached to a printed board, and FIG.
The figure is a perspective view showing the high voltage variable resistor of the present invention combined with a flyback transformer. 1... Substrate, 1a... First circular portion, 1b...
2nd circular portion, 1c...resistor, 2...slider,
4...Rotary shaft for focus voltage adjustment, 5...Rotary shaft for screen voltage adjustment, 6...Case, 11...
...High voltage variable resistor, 12...Case, 14...Input terminal, 15...Focus voltage output terminal, 16
... Earth terminal, 17 ... Screen voltage output terminal, 20 ... Engagement piece, 21 ... Printed board.

Claims (1)

[Claims for Utility Model Registration] An insulating case 12 having an opening at one end and having an engaging piece 20 that engages with a printed board, and a surface provided with a resistor having at least a circular shape is located inside the insulating case. A substrate 1 arranged to face the bottom surface, rotating shafts 4 and 5 connected to a slider that slides on a circular portion of the substrate and rotatably attached to the bottom surface of the insulating case; A grounding external connection terminal 16 connected to the resistor at the lower end of the board, the other end of which extends parallel to the board and is fixedly connected to the printed board, and for fitting into the flyback transformer case 23a. Fitting means 2 provided in the insulating case
2a, a focus voltage external connection terminal 15 arranged near the upper end of the substrate in parallel with the substrate and for guiding the focus voltage to the outside from the substrate; and a focus voltage external connection terminal 15 for guiding the focus voltage external connection terminal to the outside. A high voltage variable resistor comprising: a cylindrical pin cover portion 12c provided in the insulating case.