JPH06275210A - Cathode-ray tube with cv voltage supply conductor containing resistor - Google Patents

Abstract

PURPOSE:To efficiently suppress a discharged current by providing resistors on both a CV feed line and its outer circumferential pipe, necessarily passing the flow of electrons through the resistor parts even when a discharge is generated between electrodes, and setting the resistance value of each resistor part to a required value CONSTITUTION:When the lead 10a of a CV voltage supply covered conductor 12 is connected to a high voltage and CV voltage feed terminal 5, a discharge suppressing resistor R3 situated between the lead 10a and a lead wire 21 is provided on substantially the center part of the conductor 12, and a discharge resistor R4 is also inserted and connected between the lead 10a and a shield pipe 24. When a discharge is generated between respective electrodes G1-G5 of an electron gun 1, the discharged current can be controlled with a probability of 100% through not only the resistors R3, R4 but also an existing carbon electrode R5. The resistance values of the resistors R3, R4 are set to 0.3-5.0OMEGA, and the resistor 5 to 500OMEGA.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cathode ray tube provided with a resistance-containing CV supply conductor, and more particularly to a resistance-containing CV supply system capable of reliably realizing discharge current suppression.

[0002]

2. Description of the Related Art In an electron gun of a cathode ray tube (CRT) such as a television picture tube, a discharge is generated between electrodes or between an electrode and another part, which is accompanied by a large current flowing at this time. Damage to the circuit component set, etc. In order to prevent this damage, conventionally, discharge suppressing resistors (PCE) R1 and R2 are connected as shown in FIG.

An electron gun 1 of a cathode ray tube is housed in a neck portion 3 of a funnel tube body 2, and a cathode K fixed by a bead glass 4 and electrodes of, for example, first to fifth grids G1 to G5 are arranged. It has become. In this case, the grid G
3 to G5 make up a unipotential main electron lens,
High voltage and CV voltage supply to G3 and G5 is applied through the terminal (anode terminal) 5 to a high voltage HV similar to that of the fluorescent screen.

As shown in FIG. 5, the high-voltage and CV voltage supply terminal 5 is in the shape of a coma, the central axis of which is the CV voltage supply portion 5a, the periphery thereof is an insulating layer 5b such as glass, and the outside thereof. The surrounding portion is configured as the high pressure supply portion 5c. The high voltage HV applied through the anode terminal 5 is brought into contact with the elastic metal lead piece 11 attached to the fifth grid G5 through the internal conductive film 6 made of a carbon film applied to the inner surface of the funnel tube 2, The fifth grid G5 and the third grid G3 are brought into contact with each other through the discharge suppressing resistor R1.

Regarding the other electrodes K, G1, G2 and G4, they are connected to the corresponding terminal pins 9 penetratingly provided in the stem 8 sealed at the end of the neck portion 3 by a lead wire, and power is supplied from each terminal pin 9. However, the focus electrode to which a low voltage is applied, that is, the fourth grid G4 and the corresponding terminal pin 9 are connected in the same manner as the discharge suppressing resistor R2.
Through.

On the other hand, the voltage for convergence (CV) is supplied through the CV plate 2 via the lead 10a, the CV voltage supply covered conductive wire 12 fixed by the supporter 7, and the lead 10b.
Supplied to zero. As described above, in the conventional cathode ray tube, the soft flash (discharge current suppression) is performed by providing the discharge suppressing resistors R1 and R2.

[0007]

In the discharge current suppressing method according to the above conventional structure, the discharge current is not sufficiently suppressed. That is, the discharge current does not pass through the resistors R1 and R2,
In some cases, it would flow along the surface of the bead glass 4 of the electron gun 1 in 20 to 30%.

The arrow A in the figure shows the flow of electrons in the case of soft flash, and the arrow B shows the flow of electrons in the case of creeping discharge on the bead glass. In addition, the discharge suppression resistor R1,
Since R2 is a ceramic resistor, it may be chipped,
It also deteriorates the suppression effect.

In view of the above problems, an object of the present invention is to provide a cathode ray tube provided with a resistance-containing supply conductor capable of suppressing discharge current by 100%.

[0010]

According to the present invention, there is provided a cathode ray tube having a resistor for suppressing a discharge current, wherein the resistor has a convergence voltage supply conductor and the convergence voltage supply conductor coating portion. Is a cathode ray tube with a CV voltage supply lead with resistance, characterized in that it is provided as a connection insert in each of the.

[0011]

According to the present invention, in a color CRT which requires a CV voltage supply coated conductor, that is, a CV pipe (conductor coating portion) / lead (conductor) 12, as a CV supply system, it is connected to each of the CV pipe 24 / lead 21. Since the resistors R3 and R4 for suppressing the discharge current are provided as the insertion body, the discharge electrons generated between the electrodes of the electron gun 1 are generated by the resistors R3 and R4 and the neck carbon resistance R5 of the neck portion of the CRT. Is captured, a sufficient soft flash (discharge current suppression) effect can be obtained.

In the present invention, in order to obtain a sufficient soft flash effect, it is preferable that the resistance values of the discharge suppressing resistors R3 and R4 and the carbon resistor are each 0.5 to 5.0 KΩ.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a partial schematic view of an embodiment of a cathode ray tube having a CV voltage supply lead wire with resistance according to the present invention. The same elements as those shown in FIG. 4 for explaining the conventional technique are designated by the same reference numerals in FIG. As shown in FIG. 1, the cathode ray tube of this embodiment has a lead 1 at the high voltage and CV voltage supply terminal 5.
The discharge suppressing resistor R3 is connected between the lead wire 21 in the substantially central portion of the CV voltage supply covered conductive wire 12 to which 0a is connected, and the discharge resistor R4 is connected and inserted between the shield pipe (pipe cover) 24.

When a discharge is generated between the electrodes G1 to G5 of the electron gun 1, the flow of electrons is irrespective of the position of the discharge source, the resistors R3 and R4 of FIG. 1 or the carbon resistor R5 which has existed in the past. The soft flash (suppression of discharge current) is achieved with 100% probability.

The discharge current passes through the resistor R3 when the reverse bias is generated between the high voltage (HV) and the CV at the moment when the discharge is generated and the leak occurs between them.

The discharge suppressing resistors R3 and R4 are shown in FIG.
Cylindrical Al containing carbon ₂O₃Ceramic material
The molded body is fired in an oxygen atmosphere at the temperature and time.
By selecting carbon dioxide on the surface only
Gas CO₂As Al and₂O₃The
The lamic insulating layer 15 is formed, and carbon is internally formed.
Al having the required specific resistance due to the remaining₂O₃of
The ceramic resistance core body 16 is constructed as an integral structure. This
The metal terminal caps 17 are provided on both ends of the resistors R3 and R4.
Fit in. The pipe end on the top of this terminal cap 17.
A lead 19 is connected to the portion 18, and the lead 19 is free.
Place the end at a predetermined position where the resistors R3 and R4 should be connected, for example
Weld. In this case, the end 19a of the lead 19 is flat
To ensure that welding is performed
it can.

In this embodiment, the resistance values of the resistors R3 and R4 are 3.0 to 5.0 KΩ, and the resistance value of the resistor R5 is 500.
Ω was set to avoid creeping discharge on each surface and obtain a sufficient soft flash effect.

In Table 1, HV = 30KV (CV = 28.8K
V) shows the discharge suppression rates of the present example and the conventional example.

[0020]

[Table 1]

As shown in Table 1, in this embodiment, 100%
The discharge could be suppressed, but in the conventional example, the discharge was 60%, which was insufficient.

FIG. 3 shows an enlarged cross-sectional view of the CV voltage supply coated conductive wire used in this embodiment. As shown in FIG. 3, the CV voltage supply coated conductive wire of the present embodiment comprises a core lead wire 21 made of glass wool 22 and a pipe cover 24.
3 is provided between the lead wires 21, and the resistor R4 is provided between the pipe covers 24.

[0023]

As described above, according to the present invention, C
Since a resistor is provided on both the V supply conductor and its outer peripheral pipe, when a discharge occurs between the electrodes, the electron flow must always pass through the resistor parts, and each resistor part must be set to the required resistance value. With this, a sufficient soft flash (discharge current suppression) effect can be obtained.

[Brief description of drawings]

FIG. 1 is a partial schematic view of an embodiment of a cathode ray tube provided with a CV voltage supply conductor with resistance according to the present invention.

FIG. 2 is a diagram showing an embodiment of a discharge suppressing resistor according to the present invention.

FIG. 3 is an enlarged sectional view of a CV voltage supply wire.

FIG. 4 is a partial schematic view of a cathode ray tube for explaining a conventional technique.

FIG. 5 is a perspective view showing a high voltage and CV voltage supply unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electron gun 2 Funnel tube body 3 Neck part 4 Bead glass 5 High voltage and CV voltage supply terminal 8 Stem 9 Terminal pin 10a, 10b Lead 12 CV voltage supply coating lead wire 15 Ceramic insulating layer 16 Ceramic resistance core body 17 Terminal cap 18 Pipe shape Edge 20 CV plate 21 Lead wire 22 Glass wool 23 Spring 24 Pipe cover R1, R2, R3, R4, R5 Discharge suppression resistor

Claims (1)

[Claims] 1. A cathode ray tube having a resistor for suppressing a discharge current, wherein the resistor is provided as a connection insert on each of the convergence voltage supply conductor and the convergence voltage supply conductor coating portion. Characteristic CV with resistance
Cathode ray tube with voltage supply conductor.