JP2542991Y2 - High voltage resistance pack - Google Patents

Description

[Detailed description of the invention]

[0001]

[Industrial application field] The present invention relates to a CRT (Cathod Ray Tu
The present invention relates to a high-voltage resistor pack in which a high-voltage resistor, such as a bleeder resistor of a cathode ray tube, to which a high voltage is applied is housed in an insulating case.

[0002]

2. Description of the Related Art Conventionally, a bleeder resistor 1 provided in a high-voltage resistor pack having a variable resistor used for adjusting a focus voltage of a CRT or the like, as shown in FIG. Also, in order to prevent discharge, it is attached to the high-voltage resistance pack in a state where the entire surface is covered with the epoxy soft resin 2. The soft resin 2 is formed by accommodating the bleeder resistor 1 in a Teflon mold 3 and pouring the soft resin 2 therearound to cure. In this molding, in order to surely cover the corners of the bleeder resistor 1 with the soft resin 2, the soft resin 2 is molded into a curved shape that is greatly expanded at the corners of the bleeder resistor 1.

Further, as disclosed in Japanese Utility Model Laid-Open No. 2-72501, a bleeder resistor is temporarily housed in a bleeder resistor case, epoxy resin is injected and cured, and then the bleeder resistor is compressed with this case at a high pressure. There has also been proposed one in which the resin is housed in a block case, and epoxy resin is injected into the high-pressure block case and hardened. Here, the resin injected into the bleeder resistance case is a relatively soft resin, and the resin injected into the high-pressure block case has a high hardness.

[0004]

In the above-mentioned conventional technique of covering with a soft resin, the Teflon mold 3 used to cover the bleeder resistor 1 with the soft resin 2 is deformed during repeated use. There is a problem that dimensional variations occur in the molded soft resin 2. For this reason, the quality of the insulating property varies. In addition, since the work of covering the soft resin 2 is required, the price is increased. Moreover, since the mold 3 is expensive, the mold 3 cannot be replaced frequently, which also causes a variation in the insulation quality.

Further, in the case of Japanese Utility Model Laid-Open No. 2-72501, means for positioning the bleeder case at a predetermined position of the high-pressure block case is not disclosed. This means that in the structure disclosed in Japanese Utility Model Laid-Open Publication No. 2-72501, the bleeder resistance case is not attached to the high-voltage block case by using special attachment means. Inferring from the common sense of those skilled in the art, it is assumed that the bleeder resistor case is positioned in a state of being floated in the high-voltage block case using the lead wire of the bleeder resistor as a support means, and epoxy resin is injected into the high-pressure block case in that state. Conceivable. In particular, it is preferable that the portion of the bleeder resistance case adjacent to the high-voltage portion be attached at a predetermined distance from the inner peripheral surface of the high-voltage block case.
However, when the bleeder resistance case is positioned by such a method, the bleeder resistance case may move and contact the inner peripheral surface of the high-pressure block case when the resin is injected. Therefore, it is conceivable to fix the bleeder resistance case to the high-voltage block case. However, there is a problem that current leaks and cracks occur in the case depending on the mounting position.

The present invention has been made in view of the above-mentioned problems of the prior art, and has a simple structure, in which current leakage hardly occurs even under a high voltage, and a high-voltage resistor that does not crack the case. The purpose is to provide a pack.

[0007]

According to the present invention, a high voltage resistor 14 having a resistor formed on a surface of a substrate from a high voltage side to a low voltage side is housed in an inner case 16 made of insulating resin. The case 16 is housed in the housing portion 12 of the main body case 11, and a positioning portion ( 32) formed on the outer surface of the inner case 16 is provided with a mounting portion (20, 20) provided in the housing portion 12 of the main body case 11. 21, 34), the inner case 16 is fixed in the storage section 12, and the storage section 12 is filled with an insulating resin. In the present invention, the positioning portion provided inside the case 16 (3 2), on the outer surface of the front surface and the back surface not facing the side wall of the substrate of the side wall (16A to 16E) constituting the inner casing 16 (16 B) The high voltage resistor 14 is formed at a position avoiding the vicinity of the high voltage side.

[0008]

When the insulating resin injected into the storage section 12 of the main body case 11 is cured, and when the insulating resin expands and contracts due to a change in temperature after the curing, the mounting portion provided in the inner case 16 and the main body case 11 are removed. A relatively large stress is applied to the positioning part provided in the storage part 12. This stress causes a crack in the inner case 16. Therefore, in the present invention, the positioning portions ( 32) provided on the inner case 16 are provided with the side walls 16A to 16A which constitute the inner case 16.
16E is formed at a position 16B on the outer surface of the side wall that does not face the front and back surfaces of the substrate, avoiding the vicinity of the high voltage side of the high voltage resistor (14).

This is a side wall 16 forming the inner case 16.
Side wall 1 facing the front and back surfaces of the substrate among A to 16E
This is because 6A and 16C are easily deformed due to their large width and large area. These side walls 1
When the positioning portions are provided on 6A and 16C, the inner case may be formed of an expensive material capable of increasing the mechanical strength in consideration of the stress generated due to the insulating resin,
It is necessary to take measures such as sufficiently increasing the thickness of the side wall of the inner case.

On the other hand, of the side walls 16A to 16E constituting the inner case 16, the side walls 16B and 16E which do not face the front and back surfaces of the substrate have a small width and a small area, so that they are not easily deformed. Therefore, if the positioning portions ( 32) are provided at these positions, it is possible to prevent the internal case 16 from cracking without any special measures.

Also, in the present invention, since the positioning portion ( 32) is formed at a position avoiding the vicinity of the high voltage side of the high voltage resistor 14, current can leak from the high voltage side through the surface of the positioning portion. Less likely.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 to 4 , the high-voltage resistance pack 10 according to the present embodiment is a so-called focus pack for adjusting a focus voltage and a screen voltage of a CRT. Noryl resin or polybutylene phthalate (PB
T) accommodates a circuit board provided with a variable resistor (not shown) on its surface, and an insulating resin 15 such as an epoxy resin is injected into the large accommodating portion of the main body case 11 made of an insulating resin such as T). The opening is sealed.

A high voltage resistor 14 constituting a bleeder resistance network of a focus circuit is provided in the main body case 11.
The storage section 12 is also formed to house the internal case 16 in which the internal case 16 is stored and the internal case 27 in which another high-voltage resistor (not shown) is stored. The high-voltage resistor 14 has a resistor (not shown) formed on the surface of the substrate from the high-voltage side to the constant-voltage side, and is housed in an inner case 16 provided separately from the main body case 11. Are stored in the storage section 12 together with the inner case 16.

The inner case 16 has an opening on one side surface of the box, and has side walls 16A and 16C facing the front and back surfaces of the substrate, and side walls 16B and 16D not facing the front and back surfaces of the substrate. 16E. A pair of holding portions 17 for holding the high-voltage resistor 14 are further integrally formed therein, and the holding portions 17 include:
A groove 18 is formed to guide and house and hold the high voltage resistor 14. Also inside the case 16 low
The side surface of the side wall 16B of the compression side 16b, as shown in FIG. 3, as shown in FIG. 4, that the positioning unit to be written fitting the mounting portion 34 projecting from the inner wall of the housing portion 12 of the body case 11 is formed integrally .

Inside the inner case 16, a soft resin 26 having a Shure D hardness of 70 or less, such as an epoxy resin, is provided so as to cover the high voltage resistor 14 with the high voltage resistor 14 housed therein. Is filled. This ensures that the high voltage resistor 14 is held and insulated in the inner case 16.

In the housing portion 12 of the main body case 11, the inner case 16 housing the high-voltage resistor 14 is mounted not only by fitting the positioning portion 32 to the mounting portion 34 as described above. further, as shown in FIG. 4,
The other inner case 27 is also attached by inserting the engagement piece 30 into the engagement recess 31 provided on the side wall of the storage section 12.

The space inside the storage section 12 has a Sure D hardness of 78 when a flyback transformer is attached later.
~ 92 insulating resin such as hard epoxy resin,
The inner case 16 is also completely sealed.

In the high-voltage resistor pack of this embodiment, a high-voltage resistor 14 to which a high voltage is applied is housed in an inner case 16,
Since the inner case 16 is attached to the storage portion 12 of the main body case 11, the attaching operation is easy, and since it has a double structure, discharge due to cracks generated in the insulating resin is less likely to occur. 14 can be protected
You.

[0019] Incidentally, the inner case that can be used in the present invention may be one which holds a high voltage resistor to the storage space, the mounting method and shape Ru der which can be set as appropriate.

The high-voltage resistor can also be applied to various types, and the shape and application are not limited.

In the high-voltage resistor pack of the above embodiment, the high-voltage resistor housed in the housing portion of the main body case is once housed and held in the inner case, and both the inner case is fixed to the housing portion of the main body case. The mounting work is easy, the dimensional accuracy is high, and the manufacturing cost can be reduced. Furthermore, because the insulating case has a double structure,
The withstand voltage is high, and even if cracks or the like occur in any of the cases, there is no fear of current leakage, and insulation is reliably ensured.

Moreover, the inner case has a positioning portion,
Since the positioning portion fixes the inner case to the mounting portion in the storage portion, the inner case is mounted at a predetermined distance from the inner wall of the storage portion, and the internal discharge can be reliably prevented. Moreover, the positioning unit, since it is formed by do to avoid the high voltage side, Ru can be reliably prevented discharge at the high voltage side.

[0023]

Among the side walls constituting the inner case, the side walls not facing the front and back surfaces of the substrate have a small width and a small area, so that they are not easily deformed. Therefore, when the positioning portion is provided at this position as in the present invention, there is an advantage that cracks can be prevented from entering the inner case without special measures. Further, according to the present invention, since the positioning portion is formed at a position avoiding the vicinity of the high voltage side of the high voltage resistor, there is an advantage that the possibility that current leaks from the high voltage side through the surface of the positioning portion is reduced. is there.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an internal case of a high-voltage resistor according to an embodiment of the present invention.

FIG. 2 is a plan view showing a state where a high-voltage resistor is housed in an inner case of the embodiment of FIG. 1;

FIG. 3 is a cross-sectional view of the high-voltage resistance pack of the embodiment of FIG. 2 in a plane including a high-voltage resistor surface.

FIG. 4 is a plan view of the high-voltage resistance pack of the present embodiment.

FIG. 5 is a perspective view of a prior art high voltage resistor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 High voltage resistance pack 11 Main body case 12 Storage part 14 High voltage resistor 14a High voltage side 16 Inner case 16A-16E Side wall 20,21 Mounting part 22,23 Positioning part 24,25 Notch

Claims (1)

(57) [Scope of request for utility model registration] 1. The method according to claim 1, wherein the surface of the substrate is changed from a high voltage side to a low voltage side.
The high-voltage resistor (14) with the resistor formed
Housed in an inner case (16) made of rim resin, wherein the inner case is housed in a housing section (12) of a main body case (11).
And a positioning formed on an outer surface of the inner case (16).
Part(32) The storage section of the main body case (11)
(12) Mounting part provided in(34) Attach
The inner case (16) is inserted into the storage portion (12).
A high-voltage resistance pack fixed to the housing and filled with an insulating resin.
The positioning part provided in said inner case (16)(3
2) is a side wall (16) forming the inner case (16).
A to 16E), do not face the front and back surfaces of the substrate.
The side wall (16B)On the outer surface of the high-voltage resistor (1
4) Being formed at a position avoiding the vicinity of the high voltage side
High voltage resistance pack characterized by the following.