JP2578900Y2 - 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]

A conventional high-voltage variable resistor in which a capacitor is housed and arranged in a capacitor housing room provided in an insulating case, which is opposite to the side on which the capacitor housed in the capacitor housing room of the insulating case is located. When the output terminal protrudes from the end on one side (one end) and one lead terminal of the capacitor is connected to this output terminal, the lead terminal of the capacitor can be directly connected to the output 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.

An object of the present invention is to provide a high-voltage variable resistor having a capacitor storage chamber in an insulating case that can solve the above-mentioned problems.

[0005]

According to the present invention, there is provided a circuit including a plurality of variable resistors, wherein 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. an insulating substrate having a pattern on the surface is disposed on the substrate housing chamber of insulation case so as to direct the rear surface of the case opening side, the opening of the board housing chamber so as to cover the back surface of the insulating substrate an insulating resin Is filled between the capacitors
One of the pair of side walls of the insulating case where the storage chamber is located
A high-voltage variable resistor whose output terminal protrudes from the side wall is an object of improvement.

In the present invention, a pair of side walls of the insulating case are formed .
Next to the capacitor storage room on the flange formed on the other side wall
Provide a capacitor ground terminal. This conden
The grounding terminal for the
One lead terminal of the capacitor is connected. Also on the back of the board
The partition wall is located at a position away from the flange to one side wall.
The other lead end of the capacitor stored in the capacitor storage room
A fitting groove for fitting the child is formed. Also on the back of the insulating substrate
Is a capacitor at a position adjacent to the fitting groove formed in the partition wall.
The capacitor connection terminal to connect the other lead terminal of
Provide. Then, the capacitor connection terminal and the output terminal are electrically connected via a lead wire.

[0007] As in the present invention , a conde
Provide a capacitor ground terminal adjacent to the sensor storage room
And shorten one lead terminal on the ground side of the capacitor.
Wear. Also, the fitting groove formed in the partition wall on the back of the insulating substrate
Connect the other lead terminal of the capacitor to the adjacent position
And a capacitor connection terminal
When the terminal is electrically connected to the
The other lead terminal of the capacitor can be shortened.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. 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, reference numeral 1 denotes an insulating case having an open end at one end made of an insulating resin material such as PBT (polybutylene terephthalate). The insulating case 1 has side walls 2 to 5 and an upper wall 6.
Two cylindrical portions 7 and 8 through which focus output terminals T1 and T2 penetrate and protrude are provided integrally on one side wall portion 3 located in the length direction, and the other side wall portion 5 is grounded. A flange 9 to which the terminal fittings g and gc are fixed is provided integrally. The flange 9 is provided at a position several millimeters away from the opening end of the insulating case 1, and extensions 2 a and 4 a from the side walls 2 and 4 are integrally provided at both ends. 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 bulging portion 10 for housing two rotating bodies (not shown) for supporting the sliders of the 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 condensed
Of the condenser (not shown) stored in the storage chamber 1B
A ground terminal for a capacitor to which a lead terminal (one lead terminal) on the ground side is connected . The insulating substrate 18 includes a first substrate portion 18A on which variable resistors VR1 and VR2 for double focus and other circuit patterns associated therewith are formed, a variable resistor VR3 for a screen, and other circuit patterns associated therewith. And a second substrate portion 18B on which is formed. 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, a first substrate portion 18A and a second substrate portion 18B
Are approximately 3: 2 in the width direction.
A space for forming the capacitor storage chamber 1B is formed at a portion where the width dimension of the second 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 connected to 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. This terminal fitting f2 'is a lead terminal (the other lead end) of a capacitor C ( not shown) stored in the capacitor storage chamber 1B.
In order to avoid having to directly connect the second terminal to the terminal fitting f2 to which the output terminal T2 is connected .
It is provided adjacent to the fitting groove 16c. Terminal fitting f2
And the terminal fitting f2 'are 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 about 10 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 a capacitor storage chamber in an insulating case. Of course, if it is a variable resistor for use, it can be applied to a high-voltage variable resistor for other uses.

[0016]

[Effects of the Invention] According to the present invention, the flange of the insulating case is
Next to the capacitor storage room
Ground terminal for the capacitor to connect the
The advantage is that one lead terminal of the capacitor can be shortened.
is there. Also, the fitting groove formed in the partition wall on the back of the insulating substrate
Connect the other lead terminal of the capacitor to the adjacent position
And a capacitor connection terminal
Since the power terminals were electrically connected via lead wires,
The other lead terminal of the capacitor can be shortened,
There is an advantage that occurrence of connection failure of the lead terminal 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 Insulation case 1A Insulated board storage room 1A1 1st board part storage part 1A2 2nd board part storage part 1B Capacitor storage chamber 2-5 Side wall part 6 Upper wall part 7,8 Cylindrical part 9 Flange part 10 First Rotating body storage swelling part 11 Second rotating body storage swelling part 13, 14, 15 Operating shaft 16 Partition wall 17 Peripheral rib 18 Insulating substrate 18A First substrate part 18B Second substrate part 19 Lead wire 20 Insulating resin

Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H01C 13/00 H04N 3/19

Claims (1)

(57) [Scope of request for utility model registration] An insulating substrate having a circuit pattern including a plurality of variable resistors on a surface thereof, wherein an inside of 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. There are disposed on the substrate receiving chamber of the insulating casing so as to direct the rear surface of the case opening side, the opening of the board housing chamber to the insulating resin so as to cover the back surface of the insulating substrate is filled, while To store the capacitor
One side of a pair of side walls of the insulating case where the chamber is located
A high-voltage variable resistor having an output terminal protruding from a wall portion , wherein the insulating case has a second side wall portion side of the pair of side wall portions.
At the flange located adjacent to the capacitor storage chamber.
One lead of the capacitor stored in the capacitor storage room
Ground terminal for the capacitor to which the
The partition wall is separated from the flange toward the one side wall.
The condenser stored in the condenser storage chamber
A mating groove into which the other lead terminal of the sensor is fitted is formed.
The fitting formed on the partition wall on the back surface of the insulating substrate.
The other lead terminal is connected to a position adjacent to the mating groove.
Capacitor connection terminal is provided, and the capacitor connection terminal and the output terminal
A high-voltage variable resistor, which is electrically connected via