JP3242075B2 - High voltage resistance pack - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CRT (Cathod Ra
The present invention relates to a high-voltage resistor pack in which a high-voltage resistor, such as a bleeder resistor of a y-tube 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 stored in a bleeder resistor case, epoxy resin is injected and hardened, and then the bleeder resistor is compressed together with the case. 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.

[0004]

In the 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.

[0005] It is an object of the present invention to provide a high voltage resistance pack in which the design of two internal cases accommodating a high voltage resistor is highly modified.

[0006]

SUMMARY OF THE INVENTION The present invention is directed to a variable resistor housing in which a variable resistor is housed inside a main body case having an opening on one side and a high voltage resistor in which a high voltage resistor is housed. A high-voltage resistance pack in which a container housing is formed is an object of improvement. In the present invention, the accommodating portion of the high-voltage resistor is formed along two side surfaces of the accommodating portion of the variable resistor, so that the shape as viewed from the opening side is L-shaped. . The two internal cases, which are formed separately from the main body case and house the high-voltage resistors, are provided at two orthogonal storage portions of the housing portion of the high-voltage resistor. It is stored along.

[0007] Either of the two internal cases may be located in the intersection region of two orthogonally-spaced storage portions of the storage portion of the L-shaped high-voltage resistor. Therefore, the length of the two inner cases can be changed within the range of the size of the intersection region between the two storage portions, and the degree of freedom in design increases.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. The high-voltage resistance pack 10 of the present embodiment includes:
As shown in FIGS. 1 to 5, this is a so-called focus pack for adjusting a focus voltage and a screen voltage of a CRT. A variable resistor (not shown) is accommodated in a large accommodating portion (accommodating portion of the variable resistor) of the main body case 11 made of an insulating resin such as a noryl resin or polybutylene phthalate (PBT), and an insulating resin 15 such as an epoxy resin. And the opening of the storage section of the variable resistor 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 housing 12 of the high-voltage resistor in which the internal case 16 in which is stored and the internal case 27 in which another high-voltage resistor (not shown) is stored is also formed. The storage section 12 for the high-voltage resistor is located along the two sides of the main body case 11.
It is configured to bend to 0 degrees and to have an L-shape when viewed from the opening side. In other words, the storage part 12 of the high-voltage resistor is composed of two orthogonal storage parts 12a and 12b.
It is constituted by. In this example, a part of the inner case 16 in which the high-voltage resistor 14 is housed is located at the intersection of the two housing parts 12a and 12b.

The high-voltage resistor 14 is formed by forming a resistor (not shown) from the high voltage side to the constant voltage side on the surface of the substrate, and is provided in an inner case 16 provided separately from the main body case 11. It is housed and housed in the housing section 12 together with the inner case 16. The inner case 16 has an opening on one side surface of the box body, and includes side walls 16A and 16C facing the front and back surfaces of the substrate and side walls 16B, 16D and 16E not facing the front and back surfaces of the substrate. It is configured. Inside it is a high-voltage resistor 1
A pair of holding portions 17 for holding the holding member 4 are integrally formed, and a groove 18 is formed in the holding portion 17 so that the high-voltage resistor 14 is guided and stored and held. As shown in FIGS. 4 and 5, positioning portions 2 fitted into mounting portions 20 and 21 protruding from the inner wall of the storage portion 12 of the main body case 11 are provided on the outer bottom surface of the side wall 16 </ b> E of the inner case 16.
2, 23 are formed integrally. This positioning part 2
2 and 23 are provided in a positional relationship where their width directions are rotated by 90 degrees with respect to the shapes of the mounting portions 20 and 21. The mounting portions 20 and 21 have slit-shaped cutouts 24 and 25, and are provided so as to sandwich the positioning portions 22 and 23 of the inner case 16, and the directions of the cutouts 24 and 25 are 90 °. The position is rotated by degrees. The positioning portion 23 and the corresponding mounting portion 21 are provided with the high-voltage resistor 1 to prevent external discharge.
4 is formed at a position relatively close to the low pressure side 14b avoiding the high pressure side 14a.

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 accommodated therein. Is filled. This ensures that the high voltage resistor 14 is held and insulated in the inner case 16.

In the housing section 12 of the main body case 11, the inner case 16 housing the high-voltage resistor 14 is mounted by fitting the positioning sections 22, 23 to the mounting sections 22, 21 as described above. In addition, as shown in FIG. 1, 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. Further, the inner cases 16 and 17 are
And the shape of the case main body 11 is made compact while ensuring pressure resistance.

Further, when the inner case 16 is mounted, since the mounting portions 20 and 21 of the storage portion 12 and the positioning portions 22 and 23 of the inner case 16 are asymmetrical with each other, the mounting direction of the inner case 16 may be erroneously set. No, it is fixed securely. Moreover, the mounting part 20,
Notches 21 and 21 are formed with notches 24 and 25, and the resin filled from the flyback transformer is filled with the notches 24 and 2.
5 reliably enters the mounting portions 20 and 21, and no air bubbles remain inside the mounting portions 20 and 21.

The internal case that can be used in the present invention may be any one that holds the high-voltage resistor in its storage space, and its mounting method and shape can be appropriately set. For example, as shown in FIG. 1, the positioning portion 3 is provided on the side surface of the side wall 16B on the low pressure side 16b of the inner case 16.
2 may be integrally formed, and a mounting portion 34 may be formed on the inner wall of the storage portion 12 corresponding to the positioning portion 32. This side wall 16B is also the same as the above-described side wall 16E,
6 is located on the outer surface of the side wall that does not face the front and back surfaces of the substrate out of the vicinity of the high-voltage resistor 14 near the high voltage side.

Further, the shapes of the positioning portion and the mounting portion can be appropriately set, and each of them may be formed in an asymmetric shape one by one. In addition, a high-voltage resistor can be applied to various types, and its shape and use are not limited.

In the high-voltage resistor pack of the above embodiment, the high-voltage resistor housed in the housing section of the main body case is once housed and held in the inner case, and both the inner case is fixed to the housing section 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. In addition, since the positioning portion is formed avoiding the high voltage side, it is possible to reliably prevent the discharge on the high voltage side.

In addition, the mounting portion is formed with a cut-out portion exposing the positioning portion even when the positioning portion is mounted, so that no air bubbles remain in the mounting portion even when the insulating resin is injected. .

Further, since the positioning portion and the mounting portion are formed asymmetrically, the mounting direction is not erroneous, the mounting operation is easy and reliable, and the reliability of the parts can be extremely enhanced.

[0022]

According to the present invention, any one of the two inner cases may be located at the intersection of the two storage portions orthogonal to each other in the storage portion of the L-shaped high-voltage resistor. The length of the two inner cases can be changed within the range of the intersection area of the storage portion, and the degree of design freedom is increased.

[Brief description of the drawings]

FIG. 1 is a plan view of a high-voltage resistance pack according to the present embodiment.

FIG. 2 is a perspective view showing an inner case of the high-voltage resistor according to one embodiment of the present invention.

FIG. 3 is a plan view showing a state where a high-voltage resistor is housed in an inner case of this embodiment.

FIG. 4 is a cross-sectional view of the high-voltage resistance pack of this embodiment, taken along a plane including the high-voltage resistor surface.

FIG. 5 is a sectional view taken along line AA of FIG. 4;

FIG. 6 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

Continuation of the front page (56) References JP-A-51-12278 (JP, A) JP-A-2-72501 (JP, U) JP-A-53-115345 (JP, U) JP-A-59-61673 (JP, U) , U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01C 13/00 H01C 1/02 H01C 1/028

Claims (1)

(57) [Claims] A storage portion for a variable resistor in which a variable resistor is stored and a storage portion for a high-voltage resistor in which a high-voltage resistor is stored are formed inside a main body case having an opening on one side. In the high-voltage resistor pack, the accommodating portion for the high-voltage resistor is formed along two side surfaces of the accommodating portion for the variable resistor, and the shape as viewed from the opening side is L-shaped. In two orthogonal storage portions of the storage portion of the high-voltage resistor, two internal cases formed separately from the main body case and housing the high-voltage resistor are provided. A high-voltage resistance pack, which is stored along the two side surfaces of the storage section of the variable resistor.