JPH11121212A - High-voltage variable resistor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high-voltage variable resistor which enables secure holding of a bleeder resistance board, even in the case where the thickness of the bleeder resistance board is uneven, and realizes easy electrical connection. SOLUTION: Inside an insulating case 1 with its back side opened, a first housing section 4 in which a circuit board 6 having a resistor pattern is housed is formed. Adjustment knobs 25 to 27 for varying the resistance value of the resistor pattern are protruding from the surface side of the insulating case 1. In a second housing section 5 partitioned from the first housing section 4 by a partition wall 3, a bleeder resistance board 20 is housed so that the board surface is in parallel to the direction of the surface side and back side of the insulating case 1. In the second housing section 5, inclination prevention ribs 8 for restricting the inclination of the bleeder resistance board 20 are projected, and connection terminals 17 and 18 having engagement parts 17b and 18a at one ends thereof are arranged. By inserting the bleeder resistance board 20 between the inclination prevention ribs 8, lead terminals 21 and 22 are connected and fixed to the engagement parts 17b and 18a of the connection terminals 17 and 18.

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 for adjusting a focus voltage of a television receiver or a display device.

[0002]

2. Description of the Related Art Hitherto, a high-voltage variable resistor called a focus pack has been widely used for adjusting a focus voltage of a television or a display device (for example, see Japanese Patent Application Laid-Open No. 8-279403). The variable resistor includes an insulating case having an open back surface side, in which a first housing portion for housing a circuit board having a resistor pattern is formed, and an insulating resin is molded in the first housing portion. Thus, an insulating resin layer is formed on the back side of the circuit board. Further, the adjustment shooting for changing the resistance value of the resistor pattern of the circuit board protrudes from the front side of the insulating case. The insulating case is formed with a second storage section partitioned from the first storage section via a partition wall.
The bleeder resistance board is housed and held in the housing so that the board surface is parallel to the front and back directions of the insulating case. By arranging the bleeder resistance substrate in the vertical direction in this way,
Increases space efficiency. One end of the bleeder resistance board is connected to a focus connection terminal of the circuit board via a lead wire, and the other end is connected to a flyback transformer connection terminal (hereinafter, referred to as an FBT connection terminal) via a lead wire. .

In order to stably hold the bleeder resistance substrate in the second storage section, for example, three ribs are integrally provided at the bottom of the second storage section from an insulating case.
By inserting a bleeder resistance substrate between the ribs, both sides of the bleeder resistance substrate are sandwiched and held.

[0004]

Incidentally, the bleeder resistance substrate is generally dip-coated with an insulating resin in order to maintain insulation from other components. However, when the both sides of the bleeder resistor substrate are sandwiched and held as described above, when the thickness of the dip exterior of the bleeder resistor substrate varies in a thick direction, the bleeder resistor substrate does not enter between the ribs or the rib is broken. There was a problem that would. Further, lead wires are soldered to these connection terminals in order to connect the bleeder resistance substrate to the focus connection terminals and the FBT connection terminals. However, there is a problem that the lead wires and soldering work are troublesome.

Accordingly, an object of the present invention is to provide a high-voltage variable resistor that can reliably hold a bleeder resistance substrate even when the thickness of the bleeder resistance substrate varies, and that can easily be electrically connected. .

[0006]

In order to achieve the above object, the present invention is directed to a first housing portion for housing a circuit board having a resistor pattern formed in an insulating case having an opening on the back side. The adjustment imaging for changing the resistance value of the body pattern is configured to protrude from the front side of the insulating case, and the insulating case is formed with a second storage part partitioned by a first storage part and a partition wall. In the high-voltage variable resistor, the bleeder resistance substrate is stored in the second storage portion such that the substrate surface is parallel to the front and back directions of the insulating case.
A plurality of connection terminals, each having an engagement portion formed at one end, are arranged in the housing portion, and a plurality of lead terminals are provided on the bleeder resistance substrate in parallel with the substrate surface. It is characterized in that it is inserted into each of the locking portions of the connection terminal and connected and fixed.

When the bleeder resistance substrate is inserted into the second storage portion such that the surface of the bleeder resistance substrate is parallel to the front and back sides of the insulating case, the lead terminals protruding from the bleeder resistance substrate are inserted into the locking portions of the connection terminals. The lead terminals are easily connected and fixed to the connection terminals. In this state, the bleeder resistance substrate is held and retained. It is preferable that the connection terminals be terminal plates having spring properties, and that the locking portions of these connection terminals be provided with an edge portion into which the lead terminal can be inserted and which bites into the lead terminal when a pulling force acts on the lead terminal. In this case, the lead terminal can be reliably electrically and mechanically connected to the connection terminal without performing additional processing such as soldering.

By inserting the lead terminal of the bleeder resistance board into the engaging portion of the connection terminal, the bleeder resistance board is held and retained, but the inclination of the bleeder resistance board cannot be restricted. Therefore, it is desirable to restrict the inclination of the bleeder resistance substrate by the inclination preventing rib. The inclination preventing ribs do not sandwich and hold the bleeder resistance substrate, and the interval may be slightly larger than the thickness of the bleeder resistance substrate. Therefore, there is no problem that the bleeder resistance substrate does not enter between the ribs or the ribs are broken. When the periphery of the bleeder resistance substrate is dip-coated with an insulating resin, the thickness tends to vary. Therefore, it is desirable to set the interval between the inclination preventing ribs to be equal to or greater than the maximum thickness variation of the bleeder resistance substrate including the insulating resin.

[0009]

1 and 2 show an example of a high-voltage variable resistor according to the present invention.
This is a focus pack used for adjusting the focus and brightness of the V or C-display device.

This high-voltage variable resistor is made of a U-type material such as polybutylene terephthalate or polyphenylene oxide.
An insulating case 1 made of a flame-retardant grade V0 material that has passed the L standard is provided. The back side and the bottom side of the case 1 are open, and a peripheral wall 2 fitted with a flyback transformer (not shown) is continuously formed around the back side. In the case 1, there are first and second partitions partitioned by a partition wall 3.
The first storage unit 4 has a circuit board 6 having a resistor pattern (not shown) on its surface.
2 (see FIG. 2), and an insulating resin is molded in the housing portion 4 to form an insulating resin layer 7 on the back surface of the circuit board 6. On the back side of the insulating resin layer 7, a static capacitor 10 and a dynamic capacitor 11 are arranged. The terminals 10a and 10b of the static capacitor 10 are connected to the first focus output terminal 12 and the ground external connection terminal 13 projecting from the back surface of the circuit board 6, respectively. The protruding ground terminal 14 on the back side of the circuit board 6 is also connected to the ground external connection terminal 13. The terminals 11a and 11b of the dynamic capacitor 11 are connected to the second focus output terminal 15 and the external connection terminal 16 for DF, respectively, which protrude from the back surface of the circuit board 6.

A bleeder resistance board 20 and a high-voltage capacitor 23 are housed in the second housing 5. The bleeder resistance board 20 is housed in the vertical direction, that is, the board surface is in the depth direction of the second storage section 5, and the inclination is regulated by a pair of tilt prevention ribs 8 protruding from the bottom surface of the second storage section 5. Have been. The periphery of the bleeder resistance substrate 20 is dip-coated with an insulating resin (not shown), and the interval between the ribs 8 is set to be equal to or greater than the maximum thickness of the bleeder resistance substrate 20 including the insulating resin.

As shown in FIG. 3, an output-side lead terminal 21 and an input-side lead terminal 22 project from one side edge of the bleeder resistance substrate 20 in parallel with the substrate surface. The side lead terminal 21 is connected to the focus input terminal 17 attached to the circuit board 6, and the input side lead terminal 22 is connected to the FBT terminal 18. The focus input terminal 17 is bent so as to straddle the partition wall 3,
One end 17a is soldered to the circuit board 6 and the other end is extended to the bottom of the second housing portion 5, and the other end is provided with a locking portion for inserting and locking the output-side lead terminal 21. 17
b is formed. The FBT terminal 18 is connected to the case 1
Is fixed to the fixing rib 9 protruding from the bottom by welding or the like. One end of the fixing rib 9 is extended to the bottom of the second storage portion 5, and the locking portion for inserting and locking the input-side lead terminal 22 at this one end. 18a are formed. The other end of the FBT terminal 18 has an insertion portion 1 projecting rearward from the peripheral wall 2 of the case 1.
8b is formed, and the insertion portion 18b is provided when the variable resistor for high voltage is fitted with a flyback transformer.
It is electrically connected to the output section on the flyback transformer side.

The focus input terminal 17 and the FBT
Each of the terminals 18 is formed by pressing a terminal plate having a spring property such as phosphor bronze.
a is formed simultaneously with the press working. Locking portion 17b,
As shown in FIG. 4, reference numeral 18a has a cross-shaped slit, into which the lead terminals 21 and 22 can be freely inserted, and when a pull-out force acts on the lead terminals 21 and 22, the lead terminals 21 and 22 are formed. Edge portions 17c, 18 that bite
c. Therefore, by simply inserting the lead terminals 21 and 22 into the locking portions 17b and 18a, the lead terminals 21 and 22 can be electrically connected to the terminals 17 and 18 without performing soldering or the like. 22
Can be securely retained and fixed.

The input lead 23a of the high-voltage capacitor 23 is connected to the FBT terminal 18 by soldering or the like, and the output lead forms an external connection terminal 23b for grounding the capacitor.

A plurality of adjustment shots 25 are provided on the front side of the case 1.
27 are protruding, and these shootings 25 to 27 rotate the sliders 28 to 30 sliding on the resistor pattern formed on the surface side of the circuit board 6 to change the resistance value. . In this embodiment, the shots 25 and 26 are for adjusting the focus voltage, and the shot 27 is for adjusting the screen voltage.

In the high-voltage variable resistor having the above configuration,
When assembling the bleeder resistance board 20 to the case 1, the board 20 is inserted between the ribs 8 of the second storage section 5.
As a result, the substrate 20 is guided to a predetermined position by the rib 8, and the lead terminals 21 and 22 are engaged with the locking portions 17b and 1 of the focus input terminal 17 and the FBT terminal 18, respectively.
8a is automatically inserted. As a result, the bleeder resistance substrate 20 is held and retained, and the inclination of the bleeder resistance substrate 20 is regulated by the rib 8. Further, even if the thickness of the dip package of the bleeder resistance substrate 20 varies in the thickness direction, since the interval between the ribs 8 is set with a sufficient margin, the bleeder resistance substrate 20 does not enter between the ribs 8 or the ribs 8 There is no problem of breaking.

FIG. 5 shows a second embodiment of the present invention. In this embodiment, the lead terminals 21 and
2 is inserted between the inclination preventing ribs 8 so that it faces upward, and the locking portions 17b and 18a of the focus input terminal 17 and the FBT terminal 18 are inserted and locked from above from the lead terminals 21 and 22. It is. In this case, since the bleeder resistance substrate 20 is held between the terminals 17 and 18 and the bottom surface of the second storage section 5, there is an effect that stability is further increased.

In the above-described embodiment, the inclination preventing ribs 8 are columnar ribs protruding from the bottom surface of the second storage section 5. However, the present invention is not limited to this, and a wall extending across the second storage section 5 may be used. It may be a rib. In this case, a groove larger than the maximum value of the thickness variation of the dip exterior of the bleeder resistance substrate 20 may be provided in the wall-shaped rib. Note that the inclination preventing ribs 8 are not limited to a pair of two ribs, and may be only one rib that regulates only one surface of the bleeder resistance substrate 20. If the second storage section 5 is formed to have a width slightly larger than the thickness of the bleeder resistance substrate 20, the inclination preventing ribs 8 need not always be provided. Further, the bleeder resistance substrate is not limited to a substrate whose periphery is dip-coated with an insulating resin. Further, it is needless to say that the present invention is not limited to the high-voltage variable resistor having the structure as in the above embodiment.

[0019]

As is apparent from the above description, according to the present invention, the bleeder resistance substrate is prevented from coming off by the locking portion of the connection terminal, so that even if the thickness of the bleeder resistance substrate varies. The bleeder resistance substrate can be securely held. Also, by inserting the lead terminal of the bleeder resistance board into the locking part of the connection terminal, electrical connection can be made without troublesome work such as routing of the lead wire and soldering. This has the effect of being very simple.

[Brief description of the drawings]

FIG. 1 is a back view of a high-voltage variable resistor according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a perspective view of an example of a bleeder resistance substrate and connection terminals.

FIG. 4 is a cross-sectional view showing a state where lead terminals of a bleeder resistance substrate are inserted into connection terminals.

FIG. 5 is a perspective view of another example of a bleeder resistance substrate and connection terminals.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insulation case 3 Partition wall 4 1st storage part 5 2nd storage part 6 Circuit board 7 Insulating resin layer 8 Inclination prevention rib 17 Focus input terminal (connection terminal) 18 FBT terminal (connection terminal) 17b, 18a Lock part 20 Bleeder Resistor board 21, 22 Lead terminal

Claims (4)

[Claims] A first housing portion for housing a circuit board having a resistor pattern is formed inside an insulating case having an open back surface side, and adjustment for changing the resistance value of the resistor pattern is performed by the insulating case. A second storage portion is formed so as to protrude from the front surface side and is partitioned by a first storage portion and a partition wall in the insulating case, and the substrate surface is parallel to the front and back directions of the insulating case in the second storage portion. In the high-voltage variable resistor in which the bleeder resistance board is housed, a plurality of connection terminals having an engagement portion formed at one end are arranged in the second housing, A variable resistor for high voltage, wherein a plurality of lead terminals are protruded in parallel with the substrate surface, and the lead terminals are inserted and fixedly connected to locking portions of the connection terminals, respectively. 2. The connecting terminal comprises a terminal plate having a spring property, and the engaging portion of the connecting terminal has an edge portion into which the lead terminal can be inserted and which bites into the lead terminal when a pulling force acts on the lead terminal. The high-voltage variable resistor according to claim 1, wherein: 3. The high-voltage variable resistor according to claim 1, wherein an inclination preventing rib for restricting an inclination of the bleeder resistance substrate is projected from the second storage portion. vessel. 4. A pair of inclination preventing ribs are projected from the second storage portion, and the periphery of the bleeder resistance substrate is dip-coated with an insulating resin. 4. The high-voltage variable resistor according to claim 3, wherein the thickness is set to be equal to or greater than the maximum thickness variation of the bleeder resistance substrate containing resin.