JPS62133644A - Cathode-ray tube voltage feeding device - Google Patents

Abstract

PURPOSE:To destroy an insulating membrane formed over the surface of a voltage dividing electrode terminal, by applying a voltage between the voltage dividing electrode terminal and an elastic pressure member against the voltage dividing electrode terminal of a conductive installation piece. CONSTITUTION:When a grounding side electrode terminal 43 is directly grounded outside the tube, a current flow circuit is formed as follow: A high voltage side electrode terminal 32 resistance Ra a voltage dividing electrode terminal 35 an elastic pressure member 45a to the voltage dividing electrode terminal 35 of a conductive installation piece 44 outside deflecting electrode plates 73 and 74 an elastic pressure member 46a to a voltage dividing electrode terminal 36 of the conductive installation piece 44 the voltage dividing electrode terminal 36 resistance Re a grounding side electrode terminal 33. Thus the current through the resistance Ra and Re flow to the outside deflecting electrode plates 73 and 74. And, when an insulating membrane is formed over the surface of the voltage dividing electrode terminal 35 or 36, a voltage shown by the product of the current Ia flowing to the resistances Ra and Re, and the resistance of the insulating membrane is applied between the voltage dividing electrode terminal 35 or 36, and the elastic pressure member 45a or 46a of the conductive installation piece 44, and the insulating membrane is destroyed.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention is incorporated into a cathode ray tube and supplies a predetermined voltage obtained by dividing a high voltage such as an anode voltage of the cathode ray tube to electrodes in the tube. The present invention relates to a cathode ray tube voltage supply device.

(Summary of the Invention) The present invention provides a cathode ray tube voltage supply device that is incorporated into a cathode ray tube and supplies a predetermined voltage obtained by dividing a high voltage such as an anode voltage of the cathode ray tube to electrodes in the tube.
A voltage dividing resistor disposed inside the cathode ray tube is connected to a high voltage side electrode terminal, a ground side electrode terminal, and a first electrode terminal on an insulating substrate. A second voltage dividing electrode terminal is formed, and a resistor is formed between the high voltage side electrode terminal and the first voltage dividing electrode terminal and between the second voltage dividing electrode terminal and the ground side electrode terminal. The first and second voltage dividing electrode terminals are connected to electrodes to which a predetermined voltage is to be supplied by a conductive mounting piece that elastically presses the first and second voltage dividing electrode terminals. This connection ensures that a stable, predetermined voltage is supplied to the electrode.

(Prior Art) As a color cathode ray tube constituting a color television receiver or the like, a convergence means consisting of an inner deflection electrode plate to which an anode voltage is supplied and an outer deflection electrode plate to which a voltage somewhat lower than the anode voltage is supplied is used. One type of convergence of the red, green, and blue electron beams is to divide the anode voltage supplied to the inner deflection electrode plate within the cathode ray tube to increase the voltage supplied to the outer deflection electrode plate. There are some that have built-in voltage dividing resistors.

FIG. 6 shows an example of such a conventional cathode ray tube voltage supply device, in which a voltage dividing resistor 10 is connected to a high voltage side electrode terminal 12 on an insulating substrate 11. A resistor 17 is formed between the high voltage side electrode terminal 12 and the voltage dividing electrode terminal 14 and between the voltage dividing electrode terminal 14 and the ground side electrode terminal 13. and 18 are formed, further covering the resistors 17 and 18 with an insulating layer 1.
9 is formed, and the resistor 17 and the resistor 17 each have a predetermined resistance value. However, if necessary, an adjustment part 17a is formed and a part of it is removed. The resistance values of resistors 17 and 18 can be adjusted.

Inside the neck of the cathode ray tube, first to fifth grid electrodes 61 to 65 constituting the electron gun structure 60 are arranged, and
At the rear stage of the fifth grid electrode 65, inner deflection electrode plates 71 and 72 are opposed to each other, and an outer deflection electrode plate 73 is integrally formed and is opposed to the inner deflection electrode plates 71 and 72.
and 74, the fifth grid electrode 65 and the inner deflection electrode plates 71 and 72 are mechanically and electrically coupled and connected, and the fifth grid electrode 65 is connected to a cathode ray tube (not shown). A conductive substrate is attached to contact the graphite conductive film deposited on the funnel portion of the fifth grid electrode 65 and the inner deflection electrode plates 71 and 72 to supply an anode voltage.

The voltage dividing resistor 10 is disposed within the neck portion above the first to fifth grid electrodes 61 to 65 and the outer deflection electrode plate 73. Then, the conductive mounting piece 22 is spot-welded to the fifth grid electrode 65 at its leg 22c, and the elastic pressing part 22a elastically presses the high voltage side electrode terminal 12 between the base of the conductive mounting piece 22 and the elastic pressing part 22a. The voltage dividing resistor 10 is clamped so as to press the high voltage side electrode terminal 1.
2 is connected to the fifth grid electrode 65, and the conductive mounting piece 2
The voltage dividing resistor 10 is held between the base part 30 and the elastic pressing part 23a so that the elastic pressing part 23a elastically presses the ground side electrode terminal 13, and the leg part 23c of the conductive mounting piece 23 is connected to the neck part (not shown). The ground side electrode terminal 13 is connected to the terminal pin penetrated through the stem at the base of the tube, and the ground side electrode terminal 13 is grounded outside the tube either directly or through an adjustment resistor, and the conductive mounting piece 24 is attached to the outer deflection electrode plate 73. The leg portions 24C are spot welded, and the voltage dividing resistor IO is held between the base of the conductive attachment piece 24 and the elastic pressing portion 24a so that the elastic pressing portion 24a elastically presses the voltage dividing electrode terminal 14. A voltage dividing electrode end +14 is connected to the outer deflection electrode plate 73.

Therefore, if the resistance between the high voltage side electrode terminal 12 and the voltage dividing electrode terminal 14 is Ra, and the resistance between the voltage dividing electrode terminal 14 and the grounding side electrode terminal 13 is Re, then the grounding side electrode terminal 13
The connection relationship of the voltage supply device shown in Fig. 6 when the voltage supply device is directly grounded outside the pipe is as shown in Fig. 7, and the
The voltage obtained by dividing the anode voltage Ea supplied to the grid electrode 65 by the resistors Ra and Re is supplied to the outer deflection electrode plates 73 and 74. - As an example, if the anode voltage Ea is 25kV, the resistance Ra is 45MΩ
, the resistance Re is made to be 600 MΩ, so the voltage supplied to the outer deflection electrode plates 73 and 74 is approximately 23.256 k
It is made into V.

(Problems to be Solved by the Invention) By the way, the voltage dividing electrode terminal 1 of the voltage dividing resistor 1o described above
An insulating film such as an oxide film is formed on the surface of the voltage dividing resistor 1o during the manufacturing process of the voltage dividing resistor 1o or the process of assembling it into a cathode ray tube. An insulating film may be interposed between them. In the conventional voltage supply device shown in FIG. 6, an insulating film is interposed between the voltage dividing electrode terminal 14 of the voltage dividing resistor 10 and the elastic pressing part 24a of the conductive mounting piece 24, and When resistance is formed between the electrode terminal I4 and the elastic pressing part 24a, a part of the electron beam collides with the outer deflection electrode plate 73 or 74, and as shown in FIG. A current Ic flows through the resistor Re,
The voltage Ec supplied to the outer deflection electrode plates 73 and 74 is lower than the predetermined voltage determined by the anode voltage Ea and the voltage dividing resistors Ra and Re by the product of the resistance Rc and the current Ic, and , the amount of electrons colliding with the outer deflection electrode plate 73 or 74 changes and the current Ic changes, causing a change in the voltage Ec, resulting in the inconvenience that stable and reliable convergence cannot be achieved.

In view of this, the present invention provides a cathode ray tube voltage supply device that is incorporated into a cathode ray tube and supplies a predetermined voltage obtained by dividing a high voltage such as an anode voltage of the cathode ray tube to electrodes in the tube. Even if an insulating film is formed on the surface of the voltage dividing electrode terminal of the resistor, when a high voltage is supplied to the high voltage side electrode terminal of the voltage dividing resistor and current flows through the resistor of the voltage dividing resistor, the voltage dividing will occur. By applying a voltage between the voltage electrode terminal and the elastic pressing portion of the conductive mounting piece that connects the voltage electrode terminal to the electrode to which a predetermined voltage is to be supplied, the voltage is applied to the surface of the voltage dividing electrode terminal. The formed insulating film is destroyed so that the elastic pressing part of the conductive mounting piece that connects the voltage dividing electrode terminal to the electrode to which a predetermined voltage is to be supplied comes into direct contact with the voltage dividing electrode terminal. This ensures that a stable, predetermined voltage is supplied to the electrode.

(Means for Solving the Problems) In the present invention, the voltage dividing resistor is divided into two voltage dividing electrode terminals, a first voltage dividing electrode terminal and a second voltage dividing electrode terminal, and a high voltage side A resistor is formed between the electrode terminal and the first voltage-dividing electrode terminal and between the second voltage-dividing electrode terminal and the ground side electrode terminal, and the first and second voltage-dividing electrode terminals are provided with a resistor. The electrode terminals are connected to the electrodes to which a predetermined voltage is to be supplied by electrically conductive attachment pieces that elastically press the first and second voltage-dividing electrode terminals.

(Function) In the cathode ray tube voltage supply device according to the present invention configured as described above, the resistance between the high voltage side electrode terminal - the resistance between the high voltage side electrode terminal and the first voltage dividing electrode terminal - the first component Voltage electrode terminal - Elastic pressing part of the conductive mounting piece against the first voltage dividing electrode terminal - Electrode to which a predetermined voltage is to be supplied - Elastic pressing part of the conductive mounting piece against the second voltage dividing electrode terminal - Second A current flow is formed between the voltage dividing electrode terminal - the resistance between the second voltage dividing electrode terminal and the ground side electrode terminal - the ground side electrode terminal, and the current flowing through the resistor of the voltage dividing resistor reaches a predetermined voltage. flows to the electrode to be supplied, and when an insulating film is formed on the surface of the first or second voltage dividing electrode terminal,
The first or second voltage dividing electrode terminal and the first conductive mounting piece.
Alternatively, a voltage is applied between the second voltage dividing electrode terminal and the elastic pressing part, and the insulating coating formed on the surface of the first or second voltage dividing electrode terminal is destroyed, and the second voltage dividing electrode terminal is damaged. The elastic pressing portions for the first and second voltage dividing electrode terminals come into direct contact with the first and second voltage dividing electrode terminals. Therefore, a predetermined voltage is always stably and reliably supplied to the electrodes connected to the first and second voltage dividing electrode terminals.

(Embodiment) FIGS. 1 and 2 are a plan view and a side view of essential parts of a color cathode ray tube incorporating an example of a cathode ray tube voltage supply device according to the present invention.

The voltage dividing resistor 30 is connected to an insulating substrate 3 such as a ceramic substrate.
By depositing thick film resistors each having a relatively low resistance value on top of the high-voltage side electrode terminals 32 . The ground side electrode terminal 33 and the first. Second voltage dividing electrode terminals 35 and 36 are formed. For example, as shown in the figure, voltage dividing electrode terminals 35 and 36 are provided at one end of an insulating substrate 31, and a grounding side electrode terminal 33 is provided at the other end.
High voltage side electrode terminals 32 are formed at lateral positions closer to the voltage dividing electrode terminals 35 and 36 between the voltage dividing electrode terminals 35 and 36 and the ground side electrode terminal 33, respectively.

Further, on the insulating substrate 31, a thickness having a high resistance value is formed between the high voltage side electrode terminal 32 and the first voltage dividing electrode terminal 35 and between the second voltage dividing electrode terminal 36 and the ground side electrode terminal 33. Film resistors 37 and 38 are formed. The thick film resistors 37 and 38 each have a zigzag pattern, and each has a predetermined resistance value.
Adjustment portions 37a and 38a are formed as necessary, and by cutting out a portion of the adjustment portions, the respective resistance values can be adjusted. Furthermore, the insulating substrate 31
An insulating layer 39 is formed on top, covering the thick film resistors 37 and 38.
is formed to the required thickness.

An electron gun assembly 6° is disposed within the neck portion 51 of the tube 50. The electron gun structure 60 includes first to fifth grid electrodes 61 to
65 are arranged coaxially in common with the red, green and blue cathodes 66R, 66G and 66B, and a fifth
After the grid electrode 65, there are inner deflection electrode plates 71 and 72 facing each other, and outer deflection electrode plates 73 and 74 integrally formed opposite to the inner deflection electrode plates 71 and 72.
A convergence means 70 is arranged and configured. The first to fifth grid electrodes 61 to 65 and the outer deflection electrode plates 73 and 74 are mechanically connected by beading glasses 67 and 68, and the third grid electrode 6
3 and the fifth grid electrode 65 are electrically connected by a conductive piece 69, and the fifth grid electrode 65 and the inner deflection electrode plate 7
1 and 72 are mechanically connected by conductive plates 75 and 76.
Connected and connected electrically. Further, a graphite conductive film 80 is adhered to the inner wall surface of the funnel portion 52 of the tube 50 and extends to the inner wall surface of the neck portion 51, and the fifth grid electrode 6
Conductive springs 91 to 93 are attached to 5, and the conductive springs 91 to 93 contact the graphite conductive film 80, and an anode voltage is supplied to the graphite conductive film 80 through an anode button (not shown) provided in the fan through part 52. As a result, an anode voltage is supplied to the third and fifth grid electrodes 63 and 65 and the inner deflection electrode plates 71 and 72.

The outer deflection electrode plate 73 includes a base portion 44b and two elastic pressing portions 45a and 46a integrally formed with the base portion 44b.
and a base 44 on the opposite side to the elastic pressing parts 45a and 46a.
A conductive mounting piece 44 having a leg portion 44G integrally formed with the first grid electrode 61 is attached to the first grid electrode 61 by spot welding the leg portion 44C. The conductive support piece 49 is attached with a straight H8 contact, and one end of the voltage dividing resistor 30 on which the voltage dividing electrode terminals 35 and 36 are formed is connected to the base 44b of the conductive mounting piece 44 and the elastic pressing part 45a. and 46
a, the elastic pressing parts 45a and 46a are held so as to elastically press the voltage dividing electrode terminals 35 and 36, respectively, and the voltage dividing electrode terminals 35 and 36 are connected to the outer deflection electrode plate 73, and the ground side The other end side where the electrode terminal 33 is formed is supported by the conductive support piece 49, and the outer deflection electrode plate 73 and the first to fifth grid electrodes 6
It is placed above 1 to 65. In addition, the fifth grid electrode 65
includes a base 42b, an elastic pressing portion 42a formed integrally with the base 42b, and a base 42 on the opposite side of the elastic pressing portion 42a.
A conductive mounting piece 42 having a leg portion 42C integrally formed with 2b is attached by spot welding the leg portion 42c, and is attached to the high voltage side electrode terminal 3 of the voltage dividing resistor 30.
2 is formed on the base 42b of the conductive mounting piece 42.
The high-voltage side electrode terminal 32 is connected to the fifth grid electrode 65 by being held between the elastic pressing portion 42 a and the high-voltage side electrode terminal 32 so as to elastically press the high-voltage side electrode terminal 32 . Furthermore, the leg portion of the conductive mounting piece 43 has a base portion 43b, an elastic pressing portion 43a formed integrally with the base portion 43b, and a leg portion 43c integrally formed with the base portion 43b on the opposite side of the elastic pressing portion 43a. 43c, although not shown, is passed through the stem at the base of the neck portion 51 and connected to a terminal pin that is grounded outside the tube either directly or via an adjustment resistor, and is connected to the ground side electrode of the voltage dividing resistor 30. The other end on which the terminal 33 is formed is held between the base 43b of the conductive attachment piece 43 and the elastic pressing part 43a so that the elastic pressing part 43a elastically presses the ground side electrode terminal 33.

Therefore, if the resistance between the high voltage side electrode terminal 32 and the voltage dividing electrode terminal 35 is Ra, and the resistance between the voltage dividing electrode terminal 36 and the grounding side electrode terminal 43 is Re, then the grounding side electrode terminal 43
The connection relationship of the voltage supply devices shown in FIGS. 1 and 2 in the case where the voltage supply device is directly grounded outside the tube is as shown in FIG. Elastic pressing portion 45a of elastic mounting piece 44 against voltage dividing electrode terminal 35 - outer deflection electrode plates 73 and 74 -
A current flow is formed between the elastic pressing portion 46a of the conductive mounting piece 44 against the voltage dividing electrode terminal 36, the voltage dividing electrode terminal 36, the resistor Re, and the ground side electrode terminal 33, and the current flowing through the resistors Ra and Re is transferred to the outer deflection electrode. When the current flows to the plates 73 and 74 and an insulating film is formed on the surface of the voltage-dividing electrode terminal 35 or 36, the equivalent circuit when an insulating film is formed on the surface of the voltage-dividing electrode terminal 35 is, for example,
As shown in the figure, between the voltage dividing electrode terminal 35 or 36 and the elastic pressing portion 45a or 46a of the conductive mounting piece 44, that is, between both ends of the resistor formed by the insulating coating, a current Ia flows through the resistors Ra and Re. A voltage, expressed as the product of the resistance through the insulation coating, is applied to destroy the insulation coating. For example, the anode voltage Ea is 25kV, and the resistance Ra is 4kV.
5MΩ and the resistance Re is 600MΩ, and when an insulating film with a resistance Rca of IMΩ is formed on the surface of the voltage dividing electrode terminal 350, a voltage of 39μ is applied between both ends of the resistance Rca, and the thickness is 1000Å or less. The insulating film that is thought to be destroyed will be destroyed in an instant. Therefore, once the anode voltage E
After the current 1a flows through the resistors Ra and Re, the elastic pressing portions 45a and 46 of the conductive mounting piece 44
a directly contacts the voltage dividing electrode terminals 35 and 36, and the voltage Ec supplied to the outer deflection electrode plates 73 and 74 is a predetermined voltage determined by the anode voltage Ea and the resistors Ra and Re, as shown in FIG. become. However, when the resistance due to the insulating film is small, the voltage applied across it is also small, and it is possible that the insulating film will not be destroyed.
In that case, in the first place, the outer deflection electrode plates 73 and 74
Since the deviation of the voltage EC supplied to the voltage EC from the predetermined voltage is minute, there is no problem.

(Effects of the Invention) According to the present invention, in a cathode ray tube voltage supply device that is incorporated in a cathode ray tube and supplies a predetermined voltage obtained by dividing a voltage such as an anode voltage of the cathode ray tube to an electrode in the tube, Even if an insulating film is formed on the surface of the voltage dividing electrode terminal of the voltage dividing resistor, when a high voltage is supplied to the high voltage side electrode terminal of the voltage dividing resistor and current flows through the resistor of the voltage dividing resistor. , by applying a voltage between the voltage dividing electrode terminal and the elastic pressing part for the voltage dividing electrode terminal of the conductive mounting piece that connects this to the electrode to which a predetermined voltage is to be supplied,
When the insulation coating formed on the surface of the voltage dividing electrode terminal is destroyed, the elastic pressing part of the conductive mounting piece against the voltage dividing electrode terminal connects the voltage dividing electrode terminal to the electrode to which a predetermined voltage is to be supplied. It comes into direct contact with the electrode terminal, ensuring that a stable, predetermined voltage is supplied to that electrode.

[Brief explanation of drawings]

1 and 2 are a plan view and a side view showing the main parts of a color cathode ray tube incorporating an example of the cathode ray tube voltage supply device according to the present invention, FIG. 3 is a diagram showing the connection relationship thereof, and FIG. 5 and 5 are circuit diagrams for explaining its operation, FIG. 6 is a plan view showing essential parts of an example of a conventional cathode ray tube voltage supply device, FIG. 7 is a diagram showing its connection relationship, and FIG. The figure is a circuit diagram for explaining its operation. In the figure, 30 is a voltage dividing resistor, 31 is an insulating substrate, 32 is a high voltage side electrode terminal, 33 is a ground side electrode terminal, 35 and 36
are first and second voltage dividing electrode terminals, 37 and 38 are resistors, 42, 43 and 44 are conductive mounting pieces, 42a
, 43a, 45a and 46a are elastic pressing parts, 65 is a fifth grid electrode, and 73 is an outer deflection electrode plate. 33: Ground detection side t & terminal 42a, 43a,
45a, 46a: Plan view of a pipe in which a voltage supply device with an elastic pressing part is installed; Fig. 1; ridge view of a pipe in which a voltage supply device of the embodiment is installed; Fig. 2; Fig. 3 a c Example An explanatory circuit of FIG. 4 c An explanatory circuit of the embodiment FIG. 5 FIG. 6 FIG. 7 c An explanatory circuit of a conventional example FIG. 8

Claims (1)

[Scope of Claims] An insulating substrate, a high-voltage side electrode terminal, a grounding-side electrode terminal, and first and second voltage dividing electrode terminals formed on the insulating substrate; the high-voltage side electrode terminal and the first voltage-dividing electrode terminal; and a resistor formed on the insulating substrate between the voltage dividing electrode terminal and between the second voltage dividing electrode terminal and the ground side electrode terminal, a resistor; a conductive mounting piece that elastically presses the high-voltage side electrode terminal and connects to the electrode to which high voltage is supplied in the cathode ray tube; and a conductive mounting piece that elastically presses the ground side electrode terminal and connects the cathode ray an electrode to which a predetermined voltage lower than the high voltage in the cathode ray tube is supplied by elastically pressing a conductive attachment piece that electrically leads out of the tube and the first and second voltage dividing electrode terminals; a cathode ray tube voltage supply device having a conductive mounting piece connected to the cathode ray tube voltage supply device;