JP3024616B2 - Variable resistor for high voltage - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a TV receiver and a CR
The present invention relates to a high-voltage variable resistor used to supply a focus voltage to a cathode ray tube such as a T display.

[0002]

2. Description of the Related Art FIG. 4 shows an equivalent circuit diagram of a conventional high-voltage variable resistor. This high-voltage variable resistor includes a high-voltage input terminal 50 and a ground terminal 5.
1 and a plurality of variable resistance portions 5 provided in parallel with each other.
2 and an output terminal 53 that divides the high voltage applied to the high voltage input terminal 50 and outputs a focus voltage. Such a high voltage variable resistor is not shown in FIG. An insulating substrate on which a resistance pattern constituting the resistance portion 52 is formed and a movable slider for extracting a divided voltage from the resistance pattern are housed in an insulating case.

[0003]

By the way, in such a conventional high-voltage variable resistor, a signal input terminal 54 for DF (dynamic focus) adjustment is provided. The signal input terminal 54 is connected to the output terminal 53 side via the capacitance element 55. However, in such a connection configuration, the function of the DF is not always sufficient, and therefore, the DF adjustment accuracy is improved. Was desired.

Accordingly, an object of the present invention is to improve the DF adjustment accuracy.

[0005]

In order to achieve the above object, according to the present invention, there is provided an insulating substrate having a resistance pattern having an extraction line for dividing an input voltage and extracting the divided voltage to the outside. A clamp circuit portion connected to the take-out line, first and second capacitors each having one end connected to both ends of the clamp circuit portion, and an insulating case in which one surface for accommodating these is opened. Wherein the insulating substrate is accommodated in a substrate accommodating portion of an insulating case, and wherein the clamp circuit portion includes first and second clamp circuits.
Are housed in a clamp circuit housing and a capacitor housing formed adjacent to the substrate housing of the insulating case, respectively, and constitute a high-voltage resistor from the above.

According to the above configuration, the DF adjustment signal is input to the other ends of the first and second capacitors. Since the reference level of the divided voltage (focus voltage) output via the clamp circuit unit is adjusted, the DF adjustment accuracy can be improved.

The clamp circuit and the first and second capacitors are housed in the clamp circuit housing and the capacitor housing formed adjacent to the substrate housing.
The high voltage variable resistor becomes compact.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a plan view of a high-voltage variable resistor according to an embodiment of the present invention, and FIG. 2 is a plan view of an insulating substrate. The high-voltage variable resistor 1 includes an insulating substrate 2 and an insulating case 3 that houses the insulating substrate 2. The insulating case 3 has a box-like shape with one surface opened, and has a board storage part 4 and a component storage part 5 formed therein. The substrate housing portion 4 has a size equivalent to that of the insulating substrate 2 and is provided on one long side edge 3 of the insulating case 3.
It is provided on the a side. The component storage part 5 is adjacent to the substrate storage part 4 and the other long side edge 3 of the insulating case 3.
It is provided on the b side. That is, the board storage part 4 and the component storage part 5 are arranged in parallel along the longitudinal direction of the insulating case 3.

The component storage section 5 includes a clamp circuit section storage section 5a formed into a flat surface for storing a clamp circuit section described later, and a concave-shaped capacitance element storage section 5b formed to store a capacitance element described later. , 5c.

The insulating substrate 2 is made of a ceramic substrate, and has a resistance pattern 6 on its surface as shown in FIG.
Are formed. The resistance pattern 6 is provided between the high-voltage input electrode section 7 and the ground electrode section 8 provided at both ends in the longitudinal direction of the insulating substrate 2, and a variable resistance section 9 A is provided in the middle thereof. 9B are formed in parallel connection with each other. In addition, on the insulating substrate 2, the variable resistance section 9 is provided.
First and second extraction lines 10 and 11 for extracting the divided voltage (focus voltage) from A and 9B are formed. The take-out lines 10 and 11 are formed of a resistance pattern in this embodiment. First and second extraction electrode portions 12 and 13 are formed at the tips of the extraction lines 10 and 11, respectively.

On the other hand, a high-voltage input terminal 14, a ground terminal 15, and a first output terminal 16
Is erected. These terminals 14 to 16 are connected to the high-voltage input electrode portion 7, the ground electrode portion 8, and the first extraction electrode portion 12 on the substrate surface side, respectively, via through holes formed in the insulating substrate 2. Further, on the back surface of the insulating substrate 2, a capacitor C1 connected to the first extraction electrode section 12 and the ground electrode section 8 is provided. Further, a first signal input terminal 18 for DF adjustment is provided upright on the back surface of the insulating substrate 2. This first signal input terminal 1
Reference numeral 8 denotes a mounting electrode portion 19 formed on the surface of the insulating substrate 2.
Through a through hole.

[0012] The insulating substrate 2 having the above-described configuration is arranged such that the front surface side is the inner surface side of the insulating case 3 and the insulating case 3
The movable contact 17 is housed between the two and is fitted into the substrate housing part 4. The movable contact 17 is attached to a flange portion of a rotating shaft (not shown), and the contact with the variable resistance portions 9A and 9B is changed by operating the rotating shaft protruding outside the insulating case 3. Thus, it is interposed between each of the variable resistance sections 9A and 9B and each of the extraction lines 10 and 11.

The component storage section 5 includes the clamp circuit section storage section 5a and the pair of capacitive element storage sections 5b and 5c as described above. The high voltage input electrode section 7
It is provided on the side. A pair of capacitive element storage sections 5b and 5c
Is provided to the first signal input terminal 18 following the clamp circuit storage 5a. Then, the resistor 2 constituting the clamp circuit section 23 is provided in the clamp circuit section storage section 5a.
4 and the diode 25 are housed in parallel with each other. In addition, the first capacitance element 26 is accommodated in the capacitance element accommodation section 5c on the first signal input terminal 18 side, and the second capacitance element 27 is accommodated in the central capacitance element accommodation section 5b. Further, a second signal input terminal 28 and a second output terminal 29 for DF adjustment are erected on the component storage unit 5.

The clamp circuit 23 and the capacitor 26,
The connection between 27 and the insulating substrate 2 is as follows. That is, one lead terminal of the first capacitive element 26 is
And the other lead terminal is connected to a second output terminal 29, respectively. One lead terminal of the second capacitor 27 is connected to a second signal input terminal 28.
The other lead terminal is led out to the front surface side of the insulating substrate 2 through the insertion hole 30 formed in the insulating substrate 2 and
Are connected to the extraction electrode section 13. Further, one lead terminal of the resistor 24 and the diode 25 is connected to the second
Output terminal 29, and the other lead terminal
It is led out to the front side of the insulating substrate 2 through 8 and connected to the second extraction electrode section 13.

The circuit configuration of the high-voltage variable resistor 1 is as shown in the equivalent circuit diagram of FIG. That is, each variable resistance section 9
Of the divided voltages divided by A and 9B, the divided voltage output from the second output terminal 29 is output via the clamp circuit unit 23. First and second signal input terminals 1
Signals for DF adjustment are input to 8 and 28.

In the above embodiment, a plurality of divided voltages (focus voltages) are taken out.
It may be only one.

[0017]

As described above, according to the present invention, since the clamp circuit is provided, the DF adjustment accuracy can be improved.

Further, since the clamp circuit portion and the capacitor are stored in the clamp circuit portion storage portion and the capacitor element storage portion formed adjacent to the substrate storage portion of the insulating case, they are efficiently insulated. And the entire structure can be made compact.

Further, since the clamp circuit portion and the capacitor are housed in the housing portion provided adjacent to the insulating substrate,
There is also an effect that the connection terminals between the clamp circuit portion and the capacitor and the resistance pattern of the insulating substrate can be easily drawn.

[Brief description of the drawings]

FIG. 1 is a plan view showing a configuration of a high-voltage variable resistor according to one embodiment of the present invention.

FIG. 2 is a plan view of an insulating substrate of the high-voltage variable resistor according to the embodiment;

FIG. 3 is an equivalent circuit diagram of the high-voltage variable resistor according to the embodiment;

FIG. 4 is an equivalent circuit diagram of a conventional high-voltage variable resistor.

[Explanation of symbols]

 2 Insulating substrate 3 Insulating case 5 Parts storage 5a Clamp circuit storage 5b, 5c Capacitor storage 6 Resistance pattern 23 Clamp circuit 24 Resistance 25 Diode 26, 27 Capacitor

Claims (1)

(57) [Claims] 1. A divide the input voltage divided, an insulating substrate having a resistance pattern to have a withdrawal line for taking out the divided voltage to the outside, a clamp circuit connected to the withdrawal line, the clamp circuit A first and a second capacitance element, one end of which is connected to both ends, and an insulating case having an open shape for accommodating the first and second capacitance elements, wherein the insulating substrate is housed in a substrate housing part of the insulating case. And
The clamp circuit portion and the first and second capacitors are respectively housed in a clamp circuit portion housing portion and a capacitor device housing portion formed adjacent to the substrate housing portion of the insulating case. Variable resistor for high voltage.