KR20050029550A - Cathode ray tube - Google Patents

Abstract

A color cathode ray tube is provided to prevent a side discharge effect even without performing a high frequency heating process, by arranging conductive metal springs between a bead glass and a neck glass. A color cathode ray tube comprises a panel; a funnel mounted on the rear surface of the panel; a screen formed in the panel and deposited with a plurality of phosphors; and an electron gun inserted in a neck portion of the funnel so as to emit electron beams to the screen. The electron gun includes conductive springs(161a,161b) interposed between a bead glass(159) and a neck glass(151) so as to form a predetermined voltage.

Description

 Color Cathode Ray Tube {Cathode Ray Tube}

The present invention relates to a color cathode ray tube, and further includes a conductive metal spring positioned between the bead glass and the neck glass of the electron gun and in contact with each other to prevent discharge of an electron gun, which is one of the main components of the color cathode ray tube. It relates to a color cathode ray tube characterized in that the configuration.

In general, the color cathode ray tube is used in all monitor devices that implement an image in a form that can be seen by the human eye. An optical signal such as an image, a figure, a character, or the like is generated by the action of an electron beam. Convert to and display.

The structure of the color cathode ray tube according to the prior art will be described with reference to FIGS. 1 to 3. 1 is a view showing a general color cathode ray tube, Figure 2 is a view showing the configuration of the electron gun of the color cathode ray tube according to the prior art, Figure 3 shows in detail a part of the electron gun of the color cathode ray tube according to the prior art It is a degree.

Referring to FIG. 1, a general color cathode ray tube is combined with a front glass called a panel 1 and a rear glass called a funnel (not shown), and has a predetermined light emitting role on an inner surface of the panel. A fluorescent surface (not shown) is included, and an inner conductive film 4 made of a carbon material or the like is formed on a portion of the funnel.

In addition, an electron gun (10) for emitting an electron beam (not shown) for emitting the fluorescent surface and a predetermined fluorescent substance are emitted inside the vacuum container in which the panel, the funnel, and the neck glass (not shown) connected to the funnel side are coupled. It includes a shadow mask (not shown) that selects colors.

The color cathode ray tube constructed as described above strikes a fluorescent surface formed on the inner surface of the panel 1 by an anode voltage applied to the cathode ray tube by an electron beam emitted from the electron gun 10 embedded in the neck portion of the funnel. In this case, the electron beam is deflected up, down, left, and right by a deflection yoke before reaching the fluorescent surface to implement an image.

At this time, referring to Figure 2 showing the structure of the electron gun of the color cathode ray tube according to the prior art will be described as follows.

The electron gun 10 includes three cathodes 12 corresponding to red, blue, and green phosphors applied to the screen, and first to fifth electrodes for focusing and crossing the electron beams emitted from the cathode 12 ( 13 to 17 are sequentially arranged, and at the rear end of the fifth electrode 17, electrostatic convergence means 18 composed of four deflection electrode plates 18a to 18d are arranged. In addition, the plurality of electrodes are supported by a pair of bead glass 19.

 A low voltage is applied to the first and second electrodes 13 and 14 arranged toward the cathode 12 of the plurality of electrodes, and a focus voltage of a medium voltage is applied to the fourth electrode 16 located in the middle of the other three electrodes. A positive voltage of high voltage is applied to the third and fifth electrodes 15 and 17 connected to the connection line 20.

Thus, three electron beams emitted from the three cathodes 12 pass through the plurality of electrodes 13 to 17 and then through the electrostatic convergence means 18, wherein the electron beams are the four deflection electrodes. The screen is reached through three spaces defined by the plates 18a to 18d.

However, the color cathode ray tube according to the related art configured as described above has a problem that side discharge occurs around the neck glass 3 and the bead glass 19 of the funnel.

The side discharge phenomenon is a cold emission that may occur when the carbon material used in the inner conductive film 4 applied to the funnel is partially dropped and adheres to the electrode in the electron gun or the electrode is scratched. It is generated by the field emission type discharge by the emission effect.

Here, to explain the cold cathode emission effect, the cold emission effect is that when the strong electric field of more than 100 V / m is applied to the surface of the conductor, the electron energy in the conductor exceeds the value of the restraining energy (work function) If not, it refers to a phenomenon in which electrons are emitted to the outside by the tunneling effect.

On the other hand, the structure of the electron gun of the color cathode ray tube according to the prior art for preventing the side discharge effect as described above with reference to FIG.

The electron gun 50 includes a cathode 52, a first electrode 53 to which a low voltage is applied, a third electrode 55 to which a focus voltage of medium voltage is applied, and second and fourth electrodes to which a high voltage is applied ( 54 and 56 are sequentially arranged, and the main electron lens is constituted by the second and fourth electrodes 55 to 56.

In addition, the third electrode 55 is provided with a metal wire 58 surrounding the bead glass 57, the neck glass 51 at a position corresponding to the third electrode 55 by heating and evaporating the metal wire 58. It is comprised so that the electroconductive film 59 by a metal vapor deposition film may be formed in the inner surface and the surface of the bead glass 57, respectively.

However, in the above-described configuration, some problems occur when high frequency heating is performed on the metal wire 58 to form the conductive film 59 on the opposite surface of the inner surface of the neck glass 51.

That is, when the high frequency heating is performed on the metal wire 58 to form the conductive film 59, the metal wire 58 is welded as well as the metal wire 58 provided to surround the bead glass 57. The third electrode 55 is also heated together, which affects the structure of the electron gun as a whole.

In addition, since the conductive film 59 formed by high frequency heating is electrically floating, when the knocking process is performed to improve the withstand voltage characteristic of the color cathode ray tube, the initially applied voltage of the cathode ray tube Since a high pressure of about 150 to 200% is applied, a large amount of charges are accumulated on the surface of the conductive film 59, thereby affecting the electron gun characteristics of the cathode ray tube.

The present invention has been made to solve the above-mentioned problems of the prior art, in the color cathode ray tube comprising an electron gun, the electron gun is located between the bead glass and the neck glass further contact the conductive metal spring is in contact with each other An object of the present invention is to provide a color cathode ray tube configured to include and prevent side discharge effects without undergoing a high frequency heating process that causes deformation of an electrode.

The color cathode ray tube according to the present invention for solving the above problems is a panel and a funnel mounted on the rear of the panel and a screen formed inside the panel and coated with a plurality of phosphors and inserted into the neck portion of the funnel. In the color cathode ray tube comprising an electron gun for emitting an electron beam toward the, the electron gun further comprises a conductive metal spring positioned between the bead glass and the neck glass in contact with each other so as to prevent the side discharge effect It is characterized by.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings. 4 is a view showing the configuration of the color cathode ray tube according to the present invention, Figure 5 is a view showing the configuration of the electron gun according to the present invention, Figure 6 is a view showing the front of the electron gun according to the present invention.

In the color cathode ray tube according to the present invention, the panel 101, which is the front glass, and the funnel 102, which are the rear glass, are combined, and the fluorescent surface 104 and the emitted electron beam are coated therein with a phosphor having a predetermined light emission role therein. It consists of the shadow mask 103 which selects the said fluorescent substance so that an appropriate fluorescent substance may be hit. An electron beam 106 for emitting the phosphor by hitting the phosphor, an electron gun (not shown) for emitting the electron beam toward the fluorescent surface, and a deflection yoke 105 for scanning the electron beam emitted from the electron gun up, down, left, and right; It is composed.

In addition, the frame 107 for supporting the shadow mask 103 so that the shadow mask 103 and the panel 101 are installed at a constant interval, and the frame 107 is coupled to the panel 101. It further comprises a spring (not shown), and a stud pin (108) attached to the panel 101 and connected to the spring (not shown) to fix the frame.

In addition, an inner shield (not shown), which serves to shield the cathode ray tube from being affected by external geomagnetism, is fixed to the frame, and the electron beam 106 strikes a predetermined phosphor exactly. There are 2, 4 and 6-pole magnets (not shown) that modify the trajectory of the track to prevent poor color purity.

In addition, since the cathode ray tube is made of high vacuum, it may easily be deflated due to an external impact, so that the cathode ray tube of a high vacuum state is installed by installing a reinforcing band (not shown) in the skirt of the panel. Stress is dispersed to secure the impact performance in the cathode ray tube.

In the color cathode ray tube according to the present invention configured as described above, the electron beam 106 is emitted from an electron gun embedded in the neck glass of the funnel 102, and the electron beam emitted from the deflection yoke 105 is reproduced as a two-dimensional image. Inject up, down, left, and right. In addition, the electron beam 106 strikes the phosphor of the screen 104 by passing through the shadow mask 103 by the anode voltage applied to the cathode ray tube, and the blown phosphor emits light to reproduce an image. The deflection yoke 105 scans the electron beam 106 emitted from the electron gun up, down, left and right so that an electric signal transmitted in a time series is reproduced as a two-dimensional image in a CRT. As a result, the electron beam 106 passes through the shadow mask 103 to reach the screen 104, and the screen 104 emits light by the energy of the electron beam 106 to reproduce an image.

5 and 6, the electron gun is sequentially arranged with the three cathodes 152 corresponding to the red, green, and blue phosphors, and the cathode 152 to emit from the cathode 152. Electrostatic converging means 158, which is composed of first to fifth electrodes 153 to 157 where electron beams to be focused and intersect, and four deflection electrode plates 158a to 158d, which are provided at the rear end of the fifth electrode 157, The first to fifth electrodes 153 to 157 are supported by a pair of bead glass 159, and a heater for applying heat is connected to the cathode 152.

In addition, a low voltage is applied to the first and second electrodes 153 and 154 of the first to fifth electrodes, and high voltage is applied to the third and fifth electrodes 155 and 157 connected to each other through the connection line 162. Positive voltage is applied. A medium voltage focus voltage is applied to the fourth electrode 156, and the main electron lens is configured by the third to fifth electrodes 155 to 157.

In particular, the fourth electrode 156 is equipped with a metal wire 160 to surround the bead glass 159, and the side of the fourth electrode 156 is disposed between the neck glass 151 facing the bead glass 159 and the metal wire 160. Elliptical conductive springs 161a and 161b are installed in contact with each other.

The conductive springs 161a and 161b are elastic to be mechanically or electrically contacted with each other, and are formed of a metal wire having a thickness of 0.5 mm to 1 mm to be installed to surround the bead glass 159. As it is welded to, the conductive region is maintained at a constant voltage by the fourth electrode 156 in contact with the conductive springs (161a, 161b) to form a discharge can be effectively prevented.

As described above, the surface treatment system of the cathode ray tube according to the present invention has been described with reference to the illustrated drawings, but the present invention is not limited by the embodiments and drawings disclosed herein, and may be applied within the scope of the technical idea. Can be.

The color cathode ray tube according to the present invention configured as described above is configured to include an electron gun further comprising a conductive spring installed between the bead glass and the neck glass so as to form a constant voltage, generated in the color cathode ray tube Since the side discharge effect can be effectively prevented and a high frequency heating step is not required, deformation of a plurality of electrodes generated in the high frequency heating step can be suppressed, so that the reliability of the product can be greatly improved. have.

1 is a view showing the configuration of a common color cathode ray tube,

2 is a view showing the configuration of an electron gun according to the prior art;

3 is a detailed view showing a part of an electron gun according to the prior art in detail;

4 is a view showing the configuration of a color cathode ray tube according to the present invention;

5 is a view showing the configuration of an electron gun according to the present invention;

6 is a front view showing the front of the electron gun according to the present invention.

<Explanation of symbols on main parts of the drawings>

101: panel 102: funnel

150: electron gun 151: neck glass

159: bead glass 160: metal wire

161: conductive spring

Claims (3)

A color cathode ray comprising a panel, a funnel mounted to the rear of the panel, a screen formed inside the panel and coated with a plurality of phosphors, and an electron gun inserted into the neck of the funnel to emit an electron beam toward the screen In the tube, The electron gun is a color cathode ray tube, characterized in that it further comprises a conductive spring is installed in contact between the bead glass and the neck glass to form a constant voltage. The method of claim 1, The conductive spring is a color cathode ray tube, characterized in that the side is formed in contact with the bead glass and the neck glass surface. The method of claim 1, The conductive spring is a color cathode ray tube, characterized in that formed of a wire having a thickness of 0.5mm to 1mm.