KR20010036881A - broun-tube - Google Patents

Abstract

PURPOSE: A brown tube is provided to prevent discharge phenomenon by making a resistor be contact with a position exactly, and to adjust a resistance value by making the resistor be varied. CONSTITUTION: A main condense electrode consists of a plurality of condense electrodes(35,35a) and one anode electrode(37), and an anode cap applies a high voltage to the anode electrode(37). A resistor(100) is coated continuing a graphite part(42) in a neck. A contact lead line(110) has one end fixed to the condense electrodes and other portion except for the other end grounded through the resistor(100), in order to apply a drop voltage to either one of the condense electrodes(35,35a) when the high voltage applied to the resistor(100) drops. A ground lead line(120) is connected to the condense electrodes and a step pin(41) so as to form a closed loop.

Description

CRT {broun-tube}

The present invention relates to a CRT; In general, the CRT is provided with a panel 13 coated with red, green, and blue fluorescent materials, as shown in FIG. 1, and a mask 18 installed close to the inner surface of the panel to serve as color screening of the electron beam 16. ), A funnel 14 fixed to the rear of the panel, an electron gun 17 mounted on the neck portion 15 of the funnel and scanning the electron beam 16 to the screen side, and an electron gun installed on the outer circumferential surface of the neck portion. It consists of a deflection yoke (19) for deflecting the electron beam emitted from the vertical or horizontal direction Maintain high degree of vacuum.

The image reproduction process of the CRT having such a configuration is as follows.

When an image signal is input to the electron gun 17 enclosed in the neck portion 15 of the funnel 14, the electron beam 16 is emitted from the cathode (not shown) of the electron gun 17, and the emitted electron beam 16 ) Is controlled, accelerated and focused by the voltage applied to each electrode of the electron gun 17, and then the trajectory is corrected by the static magnetic field of the deflection yoke 19 and passes through the holes of the mask 18, which is a color sorting device. (13) The image is reproduced by emitting the phosphor 12 coated on the inner surface.

Based on the configuration and operation principle of the CRT, the inline electron gun of the CRT will be described in more detail.

As shown in FIG. 2, the first, second, third, fourth, and third common grids of three independent cathodes 30 emitting electron beams 16 and three cathodes spaced apart from the cathode are disposed. 5, 6, 7 electrodes 31, 32, 33, 34, 35, 36, 37 and the first, 2, 3, 4, 5 electrodes 31, 32, 33 A stem (not shown), which is a power supply source for applying different constant voltages to the 34, and 35, and a funnel portion 14, which is a power supply source for applying voltage to the sixth and seventh electrodes 36, 37. An anode cap (not shown) formed on the stem, a stem pin 41 installed on the stem (not shown), a tab 29 connecting the stem pin and the electrode to each other, and an upper portion of the seventh electrode 37. A shield cup 38 for applying a high voltage to the seventh electrode and preventing the electron beam path from being distorted due to an increase in the charge on the inner wall of the neck, and positioned between the shield cup and the neck portion 15, 17) punishment for CRT It consists of the space connector (bulb space connector) (39) forms the in-line type electron gun.

In addition, the number of the focusing electrodes 35 may vary depending on the characteristics and size of the CRT.

Electron gun 17 made as described above is a heater (not shown) built in the cathode 30 receives power from the stem pin 41 to generate heat, by this heat the electron beam 16 in the cathode 30 The electron beam 16 is controlled by the first electrode 31 as the control electrode, accelerated by the second electrode 32 as the acceleration electrode, and the third and fourth auxiliary focusing electrodes serving as the auxiliary lens. The primary focusing is performed on the electrodes 33 and 34, the fifth electrodes 35 and 35a as the focusing electrode, the sixth electrode 36 as the grid of middle voltage (GM) electrode, and the seventh electrode 37 as the anode electrode. The secondary beam is focused while passing through the main focusing electrode, which serves as the main lens, and the electron beam 16 focused through the electrode passes through the shadow mask 18 in which a plurality of fine slots 18a are formed. In the inner surface, the phosphor collides with the phosphor surface 11 and the phosphor emits light.

Based on the above, the first prior art will be described as shown in FIG. 2 as follows.

In the electron gun, a resistor 50 attached to an upper surface of the bead glass 40 supporting the electrode for applying a voltage to the GM electrode 36 constituting the main lens, and the GM electrode 36 using the resistor. ), A first lead wire 51a welded to the shield cup 38 and a resistor 50, and a second lead wire 51b welded to the resistor 50 and the GM electrode 36 in order to apply a voltage thereto. And a third lead wire 51c formed by welding the resistor 50 and the stem pin 41 to each other.

Looking at the voltage application method of the GM electrode 36, which serves as an intermediate electrode in the first prior art configured as described above are as follows.

The first, second, and third lead wires 51 are different from each other, and one end of the first lead wire 51a is welded to the shield cup 38 and the other end is welded to the resistor 50 so that the shield cup 38 is connected. A high voltage is applied to the resistor 50, one end of the second lead wire 51b is welded to the resistor 50 to which the high voltage is applied, and the other end is welded to the GM electrode 36 to be stepped down from the resistor 50. A low voltage is applied to the GM electrode 36, one end of the third lead wire 51c is welded to the resistor 50, and the other end is welded to the stem pin 41, so that the closed circuit is grounded to the spem pin 41. As a result, the GM electrode 36 is operated to apply a voltage about halfway between the high voltage of the positive electrode and the focus voltage of the focusing electrode.

Therefore, in order to reduce spherical aberration by applying different voltages to the focusing electrodes 35 and 35a, the GM electrode 36, and the anode electrode 37 serving as the main lens, the GM electrode 36 has a positive electrode. It is a color CRT electron gun which acts to apply a voltage about halfway between the high voltage and the focus voltage of the focusing electrode.

The above operation is described in more detail as follows.

The spherical aberration of the main lens is closely related to the spot size of the electron beam 16 on the screen.

When these relationships are expressed in formulas,

Spot size = Is,

Where M: phase magnification

Cs: spherical aberration coefficient

θ: divergence angle

It is preferable to make the spot size small because the electron beam 16 must be correctly focused and hit the phosphor 11 to reproduce the image clearly.

In other words, the spot size on the screen can be reduced by reducing the spherical aberration coefficient Cs of the main lens in the above formula relation, and the spot size can be reduced by increasing the divergence angle θ by increasing the aperture of the main lens. .

Therefore, in order to enlarge the aperture of the main lens, the main lens is formed using the main focusing electrode composed of the focusing electrodes 35 and 35a, the GM electrode 36, and the anode electrode 37, and is applied from the stem pin 41. The focus electrodes 35 and 35a are applied to the forks voltage, and the anode electrode 37 is applied to the high voltage applied by the anode cap (not shown).

Then, the high voltage applied from the anode electrode 37 is stepped down through the resistor 50 attached to the upper surface of the bead glass 40 to form a medium voltage and applied to the GM electrode 36 so as to apply the lens of the main focusing electrode. You can enlarge the aperture.

The relationship between the voltage, lens diameter, and lens curvature radius of the GM electrode 36 will be described in detail as follows.

By applying a voltage about halfway between the high voltage of the positive electrode and the focus voltage of the focusing electrode, the positive electrode and the GM electrode form one electrostatic lens with a low potential difference, and the low potential difference between the GM electrode and the focusing electrode. The electrostatic lens is formed so that the two electrostatic lenses constitute the main focusing lens.

In this case, when the two electrodes form a lens with a low potential difference, the equipotential surface is smoothly formed to increase the lens diameter, and the influence of the spherical aberration of the electron beam focused by the lens is reduced. You can express clear images.

On the other hand, as shown in Figure 3 will be described a second conventional technology as another embodiment.

The GM electrode 36, which is the sixth electrode, of the first prior art component illustrated in FIG. 2 is deleted.

That is, the second prior art is a color CRT electron gun in which one of the plurality of focusing electrodes 35 and 35a replaces the role of the GM electrode 36 which is a component of the first prior art.

However, the first and second prior arts have the following problems.

Since a separate resistor 50 is to be attached to the bead glass 40, there is a problem that causes a decrease in precision and productivity.

In addition, if the resistor 50 is not correctly attached to the upper surface of the bead glass 40, since the charge may be accumulated on the upper surface of the bead glass 40, discharge may occur in the CRT.

In addition, since a plurality of lead wires 51a, 51b, 51c are required, the material cost is increased.

The plurality of lead wires must be welded to the shield cup 38 and the resistor 50 at once, connected to the resistor 50 and the GM electrode 36, and welded to the resistor 50 and the stem pin 41. Therefore, productivity falls.

The present invention has been made to solve the conventional problems as described above, by improving the shape and installation position of the resistor, to ensure that the improved resistance is in contact with the improved position to prevent the discharge phenomenon, installed to be variable The purpose is to adjust the resistance value arbitrarily.

1 is a block diagram of a typical CRT.

Fig. 2 is a first embodiment showing the configuration of an electron gun of the prior art.

3 is a second embodiment showing the configuration of an electron gun of the prior art;

4 is a first embodiment showing a state in which a resistor and a focusing electrode according to the present invention are connected by a contact leader line;

5 is a second form illustrating a state in which a resistor and a GM electrode according to the present invention are connected by a contact leader line.

Explanation of symbols for main parts of the drawings

100: resistor 110: contact lead wire

120: ground leader wire

The present invention for achieving the above object relates to a CRT,

A first aspect of the present invention provides a plurality of main lenses that form a main portion to focus the graphite portion formed on the inner wall of the neck to receive a high voltage, a cathode applied with a different voltage by a stem pin, and an electron beam emitted from the cathode. A main focusing electrode comprising a focusing electrode and one anode electrode; A resistor applied in succession to the graphite to apply a voltage to the focusing electrode, a contact lead wire connecting the resistor and the focusing electrode to apply a voltage stepped down by the resistor to the focusing electrode, and the resistor And a ground lead wire connected to the focusing electrode and the stem so that the focusing electrode becomes a closed circuit.

The second aspect of the present invention is to provide a main lens to focus the graphite to be applied to the inner wall of the neck to receive a high voltage, a cathode applied with a different voltage by the stem pin, and to focus the electron beam emitted from the cathode A main focusing electrode consisting of two focusing electrodes, a GM electrode and a positive electrode; In order to apply a voltage of about the middle of the high voltage of the anode electrode and the focus voltage of the focusing electrode to the GM electrode, a resistor applied in succession to the graphite portion, the resistor and the GM electrode are connected, and a voltage stepped down by the resistor is applied. Provided is a CRT comprising a contact lead wire for applying to the GM electrode, and a ground lead wire connected to the GM electrode and the stem so that the resistor and the GM electrode are closed circuits.

In order to describe the above content in more detail, referring to FIG. 4 or FIG. 5.

4 is a first embodiment showing a state in which the resistor and the focusing electrode according to the present invention are connected by a leader line, and FIG. 5 is a second embodiment of the state in which the resistor and the GM electrode according to the present invention are connected by a leader line. to be.

As shown in FIG. 4, the first aspect of the present invention is as follows.

A main focusing electrode composed of a plurality of focusing electrodes (35, 35a) and one anode electrode (37), and an anode cap for applying a high voltage to the anode electrode; The high voltage of the resistor 100 applied to the graphite portion 42 on the inner wall of the neck and the anode electrode 37 applied to the resistor 100 is stepped down so that any one of the focusing electrodes 35 and 35a is concentrated. One end is fixed to the focusing electrode in order to apply the step-down voltage to any one portion except the one end and the other end is a contact leader line 110 having an elastic and grounded connected to the resistor 100, It is a CRT made of a ground lead wire 120 connected to the focusing electrode and the stem pin 41 to form a closed circuit.

The CRT made as described above functions as follows.

In order to reduce the spherical aberration by increasing the main lens aperture, the resistor 100 is applied to the focusing electrode to apply the voltage stepped down by the whole antibody, and the resistor 100 is a graphite portion 42 on the inner wall of the neck. Since it is applied in succession, it is possible to make accurate contact and prevent the discharge phenomenon, and it is a CRT tube that adjusts the voltage value that determines the lens size according to the CRT size and shape.

That is, the present invention is the same as in the conventional art in that the high voltage is dividedly applied, but the present invention is applied to the graphite part 42 of the neck inner wall in succession, so that the resistor 100 is uniformly contacted without empty space between the neck and the inner wall of the neck. This makes it possible to prevent the discharge phenomenon, it is different from the prior art in that the resistance value can be properly implemented according to the size and type of the CRT.

In more detail, the operation and the assembly process will be described in more detail as follows.

First, in the prior art, the resistor 50 is not uniformly adhered to the top surface of the bead glass 40 in the process of attaching a separate resistor 50 to the top surface of the bead glass 40, but the present invention provides a resistance to the inner wall of the neck. Since the resistor 100 is formed by coating the graphite portion 42 so as to be connected to the graphite portion 42, the adhesive portion (not shown) becomes uniform, thereby preventing the discharge phenomenon.

In addition, in order to reduce spherical aberration according to the size and type of the CRT, the most suitable main lens aperture is determined by experiment, and the determined test value is used to find a voltage value necessary for forming the main lens aperture, and the voltage value is recalled. In order to form the focusing electrode, a resistance value is applied to the resistor 100.

At this time, the method of adjusting the resistance value proceeds using the following relationship.

Resistance (R) = Resistivity ( ) [Length of resistor (l) With respect to the cross-sectional area (S) of the resistor], the resistance value of the resistor 100 applied successively to the graphite portion 42 can be arbitrarily adjusted at the time of manufacture.

That is, when the required resistance value is set, the grooved member is used to adjust the length and cross-sectional area, which is a known technique. The resistor 100 is applied so as to be connected to the graphite portion 42 of the neck inner wall in accordance with the length and the cross-sectional area to obtain the required resistance value.

Second, after the application process of the resistor 100 is finished, the contact leader line 110 is connected as follows.

One end of the contact leader line 110 is welded to the focusing electrode, and any part except one end of the contact leader line 110 is designed to contact the resistor 100.

That is, when the above process is completed, any one part of the contact leader line 110 which contacts the inside of the neck to prevent the damage of the inner wall of the neck in the process of inserting and sealing the electron gun 17 into the neck 15 may be the inner wall of the neck. To have a bulging curved shape, the end portion is directed toward the inside of the neck so as not to contact the resistor 100 applied to the neck inner wall.

In addition, in order to prevent the contact leader line 110 from being deformed under impact when the electron gun 17 is inserted into the neck portion 15, the contact leader line 110 is formed in a plate shape having elasticity.

Third, the ground leader line 120 is used to form a closed circuit, wherein one end of the ground leader line 120 is connected to the focusing electrode, and the other end is connected to the stem pin 41 to ground. The focusing electrode and the resistor 100 are to be closed circuit.

Fourth, when the electron gun 17 is inserted into the neck portion 15 and sealed, the assembly process is completed.

Meanwhile, as shown in FIG. 5, the second embodiment of the present invention is as follows.

A main focusing electrode composed of a plurality of focusing electrodes 35 and 35a, a GM electrode 35, and an anode electrode 37, and an anode cap for applying a high voltage to the anode, the graphite portion 42 of the neck inner wall 42 ) Is applied to the resistor 100 and the high voltage of the anode electrode 37 applied to the resistor 100 is stepped down so that one end of the GM electrode is applied to the GM electrode 36. Any portion except the one end and the other end fixed to the 36 is connected to the contact leader line 110 having elasticity to be grounded to the resistor 100, the GM electrode 36 and the stem pin 41. It is a CRT made of a ground wire including a ground leader line 120 connected to form a closed circuit.

The second embodiment made as described above is subjected to the same operation and assembly process as the first embodiment described above.

However, in the first embodiment, one of the focusing electrodes receives the voltage at which the high voltage of the positive electrode is stepped down, and in the second embodiment, the GM electrode 36 receives the voltage at which the high voltage of the positive electrode is stepped down. have.

As described above, the present invention does not need to attach a separate resistor to the upper surface of the bead glass, so that the precision and productivity are improved, and no charge is accumulated on the upper surface of the bead glass, so that discharge does not occur in the CRT.

In addition, the resistance in the form of powder can be continuously applied to the graphite portion of the inner wall of the neck through a grooved member for adjusting the length, thickness and area, so that the resistance value can be easily adjusted by appropriately adjusting the length of the resistor and the cross-sectional area of the resistor. .

In addition, since the number of lead wires is reduced, material costs are reduced and productivity is improved.

Claims (5)

Graphite parts formed on the inner wall of the neck to receive high voltage, a cathode applied with different voltages by a stem pin, a plurality of focusing electrodes and one anode electrode forming a main lens to focus the electron beam emitted from the cathode In having a main focusing electrode consisting of, A resistor applied to the inner wall of the neck subsequent to the graphite portion to apply a voltage to the focusing electrode; A contact lead wire connecting the resistor and the focusing electrode to apply a voltage stepped down by the resistor to the focusing electrode; And the resistor and the focusing electrode include a ground lead wire connected to the focusing electrode and the stem to form a closed circuit. A graphite part formed on the inner wall of the neck to receive a high voltage, a cathode applied with different voltages by a stem pin, a plurality of focusing electrodes forming a main lens to focus the electron beam emitted from the cathode, a GM electrode, and In having the main focusing electrode consisting of an anode electrode, A resistor applied to the inner wall of the neck in succession to the graphite portion to apply a voltage to the GM electrode; A contact lead wire for connecting the resistor and the GM electrode to apply a voltage stepped down by the resistor to the GM electrode; And the resistor and the GM electrode comprising a ground lead wire connected to the GM electrode and the stem to form a closed circuit. The method according to claim 1 or 2, The lead wire is a Braun tube, characterized in that the elastic spring. The method according to claim 1 or 2, The CRT of the both ends of the lead wire has a shape to avoid the end that is not fixed to the focusing electrode or GM electrode to avoid contact with the resistor. The method of claim 4, wherein The avoidance shape is; And a portion of the lead wire contacting the resistor has a bulging curved shape toward the resistor so that the end of the lead wire does not touch the neck wall.