JP2570297Y2 - High-voltage variable resistor - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-voltage variable resistor.

[0002]

2. Description of the Related Art A general high-voltage variable resistor for adjusting a focus voltage and a screen voltage of a cathode ray tube includes one variable resistor for focusing and one variable resistor for screen. . However, recently, a high-voltage variable resistor called a double focus type using two variable resistors to output two types of focus voltages has been used. Many types of high voltage variable resistors of this type having a capacitor attached thereto have also been manufactured. As a typical structure for mounting a capacitor, there is a structure in which a capacitor storage chamber is provided separately from a substrate storage chamber in an insulating case having an open end, and a capacitor is stored in the capacitor storage chamber.

[0003]

In a conventional high-voltage variable resistor in which a capacitor is housed and arranged in a capacitor housing chamber provided in an insulating case, the capacitor is housed so that the case opening of the insulating case has a substantially rectangular shape. Although some measures were taken to determine the shape of the chamber, little effort was made to actively reduce the shape of the insulating case. For this reason, when a capacitor storage chamber is added in the same manner as in the related art, such as a high-voltage variable resistor having three variable resistors, the overall size of the variable resistor increases as the number of variable resistors increases. There is a problem that the size of the entire variable resistor becomes considerably large.

An object of the present invention is to reduce the size of a high-voltage variable resistor provided with three variable resistors and further provided with an insulating case and a capacitor storage chamber.

[0005]

According to the present invention, an insulating case having an opening at one end is partitioned by a partition wall to form a substrate storage chamber and a capacitor storage chamber. A high-voltage disposed in the substrate storage chamber of the insulating case with an insulating substrate provided with a circuit pattern including a second variable resistor and a third variable resistor on the front surface with the back surface facing the case opening. Variable resistor for improvement.

According to the first aspect of the present invention, the insulating substrate includes a first substrate portion and a second substrate having a width dimension smaller than that of the first substrate portion.
The first and second variable resistors are arranged side by side in the direction intersecting with the length direction on the surface of the first substrate portion. A third variable resistor is formed on the surface. The width of the insulating case in the width direction is determined based on the width of the first substrate portion of the insulating substrate, and the insulating substrate storage chamber is configured to store the first substrate portion for storing the first substrate portion of the insulating substrate. And a second substrate part storage part for storing the second substrate part. Then, a partition wall is provided so that the second substrate part storage section and the capacitor storage chamber are arranged side by side in the width direction.

According to the second aspect of the present invention, the opening of the substrate storage chamber is filled with an insulating resin so as to cover the back surface of the insulating substrate, and the insulating case is filled from the end opposite to the side where the capacitor storage chamber is located. When the output terminal protrudes, the capacitor connection terminal is provided at a position adjacent to the partition wall on the back surface of the first substrate portion of the insulating substrate. Then, the capacitor connection terminal and the output terminal are electrically connected via a lead wire, and the lead wire is embedded in the insulating resin.

According to the third aspect of the present invention, a capacitor ground terminal is provided adjacent to the capacitor storage chamber at an end of the insulating case on the side where the capacitor storage chamber is located.

According to the fourth aspect of the present invention, when the first and second variable resistors are respectively arranged on the high-voltage input electrode side, the first and second variable resistors are formed through a region along the partition wall on the surface of the insulating substrate. Of the connection patterns for electrically connecting one of the first and second variable resistors and the third variable resistor,
A portion formed on the first substrate portion is formed from a lead wire pattern that does not substantially include a resistance value.

[0010]

According to the first aspect of the present invention, the first and second variable resistors are juxtaposed in the direction intersecting the length direction of the insulating substrate, and the width of the insulating substrate is lengthened. Reduce the size in the length direction. Since only the third variable resistor and its associated circuit pattern need to be arranged on the second substrate portion, the width of the second substrate portion is the same as that of the first and second variable resistors. The dimension of the first substrate portion in the width direction can be made smaller. In the present invention, the width of the insulating case in the width direction is determined based on the width of the first substrate portion of the insulating substrate, and the space created by reducing the size of the second substrate portion is accommodated in the capacitor housing. In order to use the space as a space for forming a chamber, a partition wall is provided so that the second substrate part storage part for storing the second substrate part and the capacitor storage chamber are arranged side by side in the width direction. Thus, the size of the entire insulating case can be reduced, and the high-voltage variable resistor can be downsized.

When an output terminal is protruded from an end of the insulating case opposite to the side where the capacitor storage chamber is located, and one of the lead terminals of the capacitor is connected to this output terminal, the output terminal of the capacitor is output. It can also be connected directly to the terminal. However, in such a case, the length of the lead terminals of the capacitor must be sufficiently long, and the longer the lead terminals, the more difficult it is to insulate from surrounding components, and excessive force is applied to the soldered portion. In the worst case, a poor connection between the lead terminal and the output terminal occurs. As in the invention of claim 2, a capacitor connecting terminal is provided at a position adjacent to a partition wall on the back surface of the first substrate portion of the insulating substrate, and the capacitor connecting terminal and the output terminal are electrically connected via a lead wire. If this lead wire is embedded in the insulating resin, the lead terminal of the capacitor can be shortened.

According to a third aspect of the present invention, a capacitor ground terminal is provided adjacent to the capacitor storage chamber at an end of the insulating case on the side where the capacitor storage chamber is located.
The lead terminal of the capacitor can be shortened as in the invention of the second aspect.

When the width of the second substrate portion of the insulating substrate is reduced to form a space for arranging the capacitor storage chamber, the capacitor is formed through a region along the partition on the surface of the insulating substrate, and the first and second portions are formed. It is necessary to devise a configuration of a connection pattern for electrically connecting one of the variable resistors to the third variable resistor. That is, a high voltage is applied to the first and second variable resistors arranged on the first substrate portion of the insulating substrate,
If a large potential difference occurs with the connection pattern,
Discharge may occur due to the potential difference. First
When the connection pattern is formed from the first insulating substrate toward the second insulating substrate having a smaller width, the portion of the connection pattern formed on the surface of the first insulating substrate may approach the first and second variable resistors. I have no choice. In the invention according to claim 4, since the connection pattern portion formed on the first substrate portion is formed from a lead wire pattern having substantially no resistance value, the connection pattern is formed by the first and second variable resistors. , No large potential difference occurs, and the occurrence of discharge can be prevented.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention; 1A to 1C show a plan view, a partially cutaway side view, and a bottom view of an embodiment in which the present invention is applied to a double-focus type high-voltage variable resistor. Note that the insulating resin is not illustrated in FIG. FIG. 2A shows a circuit pattern formed on the surface of the insulating substrate, and FIG. 2B shows a circuit diagram of the circuit pattern. In these figures, 1 is the PBT
One end opening-shaped insulating case formed of an insulating resin material such as (polybutylene terephthalate). The insulating case 1 has side walls 2 to 5 and an upper wall 6. A focus output terminal T is provided on one side wall portion 3 located in the length direction.
Two cylindrical portions 7 and 8 through which 1 and T2 penetrate and protrude are provided integrally, and a flange portion 9 to which earth terminal fittings g and gc are fixed is provided integrally with the other side wall portion 5. Have been. The flange 9 is provided at a position a few millimeters away from the opening end of the insulating case 1, and the side wall 2 is provided at both ends thereof.
And 4 are provided integrally with extensions 2a and 4a. The flange portion 9 is formed with a lead wire holding concave portion 9a into which a high-voltage lead wire covered with an insulating material and connected to the screen output terminal fitting s is fitted.

The upper wall portion 6 includes a first rotating body housing swelling portion 10 for housing two rotating bodies (not shown) for supporting sliders of two variable resistors for double focus. A second rotating body housing bulging portion 11 for housing a rotating body (not shown) supporting a slider of the screen variable resistor, and a capacitor housing forming a part of an outer wall of the capacitor housing chamber 1B. The bulging portion 12 is provided integrally. The first rotator housing bulging portion 10 has a substantially oval contour shape extending in a direction intersecting at an angle of about 45 degrees with the length direction as viewed in the plan view of FIG. And two operation shafts 13 and 14 are supported. Second rotator housing bulge 11
Is formed close to the side wall 2 and the side wall 5 and supports the operation shaft 15. A cross-shaped driver slot is formed at the tip of each of the operation shafts 13 to 15. The capacitor housing bulging portion 12 has an elongated box shape in which two side walls of the peripheral wall portion are formed along the side wall portions 4 and 5. A partition wall 16 (FIG. 1C) extending from the base of the peripheral wall portion of the capacitor housing bulging portion 12 toward the case opening of the insulating case 1 is continuously and integrally provided. The partition wall 16 is provided for forming the insulating substrate storage chamber 1 </ b> A and the capacitor storage chamber 1 </ b> B inside the insulating case 1, and extends near the opening end of the insulating case 1. A fitting groove 16 into which a lead terminal of a capacitor (not shown) is fitted is provided at an opening-side end of the pair of walls 16a and 16b located in the length direction.
c and 16d are formed. Peripheral ribs 17 on which an alumina-based ceramic insulating substrate 18 is placed, and ribs (not shown) surrounding the terminal electrodes are provided on the side walls 2 to 5 and the partition wall 16 surrounding the insulating substrate storage chamber 1A. Are integrally formed. The substrate storage chamber 1A is composed of a first substrate storage part 1A1 and a second substrate storage part 1A2 whose widthwise dimension is shorter than that of the first substrate storage part.

As shown in FIG. 2A, a variable resistor VR for double focus is provided on the surface 18a of the insulating substrate 18.
1 and VR2, a screen variable resistor VR3,
Fixed resistors R01, R02, R1 to R5, lead wire patterns L1 to L3, focus output electrodes F1 and F2
And supplemental electrodes F1 ′ and F2 ′, a high-voltage input electrode H,
A circuit pattern including the screen output electrode S and the ground electrode G is formed. Note that the same reference numerals as those used in FIG. 2A are also given to the circuit diagram of FIG. Also, the terminal fittings f1 and f1 shown in FIG.
′, F2, f2 ′, s, and g correspond to the electrodes F1, F1 ′, F2, F2 ′, S, and G shown in FIG.
8 are terminal fittings electrically connected through through-hole conductors provided so as to penetrate through No. 8. gc is a capacitor ground terminal fitting. The insulating substrate 18 includes a first substrate portion 18 on which variable resistors VR1 and VR2 for double focus and other circuit patterns associated therewith are formed.
A, and the second substrate portion 18 on which the screen variable resistor VR3 and other circuit patterns associated therewith are formed.
B. The dimension in the width direction (the direction orthogonal to the length direction) of the second substrate portion 18B is shorter than the dimension in the width direction of the first substrate portion 18A. In this example, the dimensional ratio in the width direction between the first substrate portion 18A and the second substrate portion 18B is approximately 3: 2. Second
A space for forming the capacitor storage chamber 1B is formed in a portion where the dimension in the width direction of the substrate portion 18B is shortened.

Variable resistors VR1 and VR for focusing
2 are formed on the surface of the first substrate portion 18A so as to be arranged in a direction making an angle of approximately 45 degrees with the length direction, and the screen variable resistor VR3 is formed on the second substrate portion 18B.
Near the longitudinal end of the surface. The dimension in the width direction of the second substrate portion 18B is reduced in order to secure a space for forming the capacitor storage chamber, and the variable resistor V2 is provided in order to provide the supplementary electrode F2 '.
The connection patterns (L2 and R4) formed between R2 and the variable resistor VR3 must be formed close to the variable resistors VR1 and VR2. However, when the potential difference between the connection pattern and the variable resistors VR1 and VR2 to which a high voltage is applied becomes large, there is a risk that discharge occurs between the two. Therefore, in the present embodiment, particularly, the portion of the connection pattern formed on the first substrate portion 18A is constituted by the lead wire pattern L2 substantially including no resistance value.

The supplementary electrode F2 'is formed on the back surface 1 of the insulating substrate 18.
8b is electrically connected to a terminal fitting f2 '[FIG. 1C] which constitutes a capacitor connection terminal fixed to 8b. The terminal fitting f2 'is provided so that the lead terminal of the capacitor C (not shown) stored in the capacitor storage chamber 1B does not need to be directly connected to the terminal fitting f2 to which the output terminal T2 is connected. Terminal fitting f2 and terminal fitting f
2 ′ is electrically connected by a lead wire 19. As shown in FIG. 1C, the lead wire 19 is embedded in the insulating resin while being separated from the back surface 18b of the insulating substrate 18. The supplementary electrode F1 'is a terminal fitting f1' used to prevent the lead terminal of the capacitor from being too long when a capacitor is electrically connected between the output electrode F1 and the ground electrode G. It is provided for the purpose of fixing. One end of a hard conductive wire 21 such as a piano wire arranged on the back surface 18 b side of the insulating substrate 18 is connected to the high-voltage input electrode H. The other end 21a of the conductive wire 21 rises in the direction away from the insulating substrate 18 and protrudes from the layer of the insulating resin 20, and is inserted into a conductive rubber terminal provided on the flyback transformer (not shown).

The capacitor accommodated in the capacitor accommodating chamber 1B is called a dynamic focus capacitor and has a rating of several tens of kV and a capacity of the order of 1000 pF. Normally, a film capacitor is used as the dynamic focus capacitor. This is because even if a short circuit occurs, only a part of the film disappears and there is no fear of disconnection. The capacitor storage chamber 1B is filled with a hard vacuum casting resin used for casting a flyback transformer.

When the insulating substrate is fixed to the insulating case, a plurality of protruding pieces are provided on the inner surface of the upper wall of the insulating case, holes are provided in the insulating substrate, and the protruding pieces are inserted into the holes and positioned.
The tip portion can be fixed by welding. Also, the resin may be cast over the electrode portion on the insulating substrate.
In that case, the shape of the rib portion of the insulating case may be appropriately changed.

In the above embodiment, the present invention is applied to a double-focus type high-voltage variable resistor. The present invention provides a high-voltage variable resistor having three variable resistors and an insulating case having a capacitor storage chamber. Of course, if it is a variable resistor for use, it can be applied to a high-voltage variable resistor for other uses.

[0022]

According to the first aspect of the present invention, in a high-voltage variable resistor having three variable resistors and a capacitor storage chamber in an insulating case, the surface of the first substrate portion of the insulating substrate is provided. The first and second variable resistors are arranged side by side in a direction intersecting with the length direction of the insulating substrate, and the dimension of the insulating case in the width direction is based on the dimension of the first substrate portion of the insulating substrate in the width direction. In order to reduce the size of the entire insulating case, the space formed by reducing the size of the second substrate portion is used as a space for forming the capacitor storage room. The size of the high-voltage variable resistor can be reduced.

According to the invention of the second aspect, the first of the insulating substrates is provided.
A capacitor connection terminal is provided at a position adjacent to the partition wall on the back side of the substrate part, and the capacitor connection terminal and the output terminal are electrically connected via leads, and this lead is embedded in the insulating resin Therefore, there is an advantage that the lead terminals of the capacitor can be shortened to prevent the occurrence of poor connection of the lead terminals.

According to the third aspect of the present invention, a capacitor ground terminal is provided adjacent to the capacitor storage chamber at the end of the insulating case on the side where the capacitor storage chamber is located. There is an advantage that the lead terminal of the capacitor can be shortened.

According to the fourth aspect of the present invention, since the connection pattern portion formed on the first substrate portion is formed from a lead wire pattern that does not substantially include a resistance value, the connection pattern is formed by the first and second connection patterns. There is an advantage that a large potential difference does not occur even when approaching the above variable resistor, and the occurrence of discharge can be prevented.

[Brief description of the drawings]

FIGS. 1A to 1C are a plan view, a partially cutaway side view, and a bottom view, respectively, of an embodiment in which the present invention is applied to a double-focus type high-voltage variable resistor.

2A shows a circuit pattern formed on a surface of an insulating substrate, and FIG. 2B shows a circuit diagram of the circuit pattern.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Insulated case, 1A ... Insulated substrate storage room, 1A1 ... First
1A2... Second substrate part storage part, 1A2
B: Capacitor storage chamber, 2-5: Side walls 2-5, 6: Upper wall, 7, 8: Cylindrical part, 9: Flange, 10: First rotator housing swelling part, 11 ... Second rotator housing bulge, 1
3, 14, 15: operation shaft, 16: partition wall, 17: peripheral rib, 18: insulating substrate, 18A: first substrate portion, 18B
... Second substrate portion, 19... Lead wires, 20... Insulating resin.

Claims (4)

(57) [Scope of request for utility model registration] A first variable resistor, a second variable resistor, and a third variable resistor, wherein the first and second variable resistors are separated from each other by a partition wall. A high-voltage variable resistor arranged in the substrate storage chamber of the insulating case so that an insulating substrate having a circuit pattern including a variable resistor on the front surface faces the case opening side, The insulating substrate has a shape in which a first substrate portion and a second substrate portion having a width dimension shorter than the first substrate portion are arranged in a length direction orthogonal to the width direction. The first and second variable resistors are juxtaposed on a surface of a first substrate portion in a direction intersecting with the length direction,
The third variable resistor is formed on the surface of the second substrate portion, and the dimension of the insulating case in the width direction is based on the dimension of the insulating substrate in the width direction of the first substrate portion. The insulating substrate storage chamber has a first substrate part storage part for storing the first substrate part of the insulating substrate and a second substrate part storage part for storing the second substrate part. The high voltage variable resistor, wherein the partition wall is provided so that the second substrate part storage part and the capacitor storage chamber are arranged side by side in the width direction. 2. An insulating resin is filled in an opening of the substrate storage chamber so as to cover a back surface of the insulating substrate.
An output terminal protrudes from an end of the insulating case opposite to a side where the capacitor storage chamber is located, and a rear surface of the first substrate portion of the insulating substrate is located at a position adjacent to the partition wall. The high-voltage variable resistor according to claim 1, further comprising a capacitor connection terminal, wherein the capacitor connection terminal and the output terminal are electrically connected via a lead wire, and the lead wire is embedded in an insulating resin. vessel. 3. A capacitor ground terminal is provided at an end of the insulating case on a side where the capacitor storage chamber is located, adjacent to the capacitor storage chamber.
2. The high-voltage variable resistor according to 1. 4. The first and second variable resistors are respectively disposed on a high-voltage input electrode side, and are formed through a region along the partition wall on the surface of the insulating substrate to form the first variable resistor.
And a portion formed on the first substrate portion of a connection pattern for electrically connecting one of the second variable resistors and the third variable resistor is a lead wire having substantially no resistance value. 3. The high-voltage variable resistor according to claim 2, wherein the variable resistor comprises a pattern.