KR20020053244A - Cathode ray tube - Google Patents

Abstract

PURPOSE: A cathode ray tube is provided to control velocity of light and improve image quality by generating a density difference between a center portion and a peripheral portion of a screen. CONSTITUTION: Constant voltage is applied to each electrode of an electron gun, a cathode, and a heater when a Braun tube is turned on. Electrons are emitted from the cathode when a cathode signal is applied. The emitted electrons are directed to a center portion(121) or an external angle of a screen by a deflection yoke. The light is generated when the electrons emitted from the electron gun are collided with a fluorescent material. At this time, the velocity of light is changed by a density difference between the center portion(121) and a peripheral portion(122) of the screen. The velocity of the light is reduced by increasing the density of the center portion(121). The velocity of the light is increased by reducing the density of the peripheral portion(122).

Description

Cathode Ray Tube {Cathode Ray Tube}

The present invention relates to a cathode ray tube for a cathode ray tube, and more particularly to a cathode ray tube for adjusting the screen arrival speed of light by varying the density of the center portion and the periphery of the panel to prevent the periphery screen from turning off and making the image look flat. will be.

Cathode ray tubes for cathode ray tubes are positioned at regular intervals to be perpendicular to the path through which the electron beams pass so that the electron beam generated at the cathode can be controlled by voltage to reach the screen.

Hereinafter, the cathode electrode tube will be described in detail with reference to FIG. 1. The first electrode 4, which is a common lattice of three cathodes 3 which are mutually independent, and three cathodes disposed at a predetermined distance from the cathode, The second electrode 5, the third electrode 6, the fourth electrode 7, the first electrode 8a of the fifth electrode, the second electrode 8b of the fifth electrode, and the second electrode 5 disposed at predetermined intervals from the first electrode, The sixth electrode 9 is arranged in order, and the upper portion of the sixth electrode 9 is an inline low-pressure gun configured in the order of the shield cup 10 with the BSC 11 attached thereto. Different voltages are supplied to these cathodes to obtain a constant current value so that the cut-off voltage is necessarily the same.

In addition, the electron gun emits electrons from the cathode 3 when the heater 2 embedded in the cathode 3 receives a voltage from the stem pin 1 and the electrons are emitted by the first electrode 4. 13, 14, and 15 are controlled, and the electron beams 13, 14, and 15 are accelerated by the second electrode 5, which is the acceleration electrode, and the second electrode 8b of the fifth electrode, which is the main lens forming electrode, and the first electrode. It passes through the six electrodes 9 and passes through the shadow mask 16 provided on the inner surface of the fluorescent surface 18 to collide with the fluorescent surface 18 to emit light.

A deflection yoke 12 is positioned to deflect the electron beams 13, 14, and 15 emitted from the electron gun outside the electron gun to the entire screen 17.

2 is a cross-sectional view schematically showing the configuration of a panel 200 of the prior art corresponding to the screen 17 in FIG.

As shown in FIG. 2, the panel 200 according to the related art maintains the existing shadow mask 16 and makes the outer screen flat so that the center portion 221 is concave and the peripheral portion 222 is thicker than the center portion. It is.

It looks at the operation of the cathode ray tube including the panel 200 of the prior art of the above configuration.

The cathode 3 used in the CRT gun is welded and fixed to the end opposite to the flange portion of the eyelet and the end opposite to the portion where the oxide is attached to the cathode so that the distance from the first electrode 4 is kept constant. 3) Insert the heater (2) inside.

When the CRT is turned on, a constant voltage is applied to each electrode of the electron gun, and a constant voltage is also applied to the cathode 3 and the heater 2.

The voltage applied to the cathode 3 is a cutoff level voltage and depends on the type of electron gun.

As described above, when a voltage is applied and a signal is input to the cathode 3, electrons are emitted from the cathode 3.

The emitted electrons pass through the respective electrode holes and are deflected by the deflection yoke 12 to advance to the center and the outer portion of the screen.

The electrons collide with red, green, and blue phosphors on the fluorescent surface 18 to emit light, and the light passes through a panel 200 made of glass, which is another medium, to reach the front surface of the screen.

At this time, each light is slightly different depending on the position of the screen. In the central portion 221, since the panel 200 glass is thinner than the peripheral portion, the light easily reaches the front portion of the screen, and the peripheral portion 222 is the panel glass. Since it is thicker than the central portion is to arrive a little later than the central portion, there is a problem that the distortion phenomenon that the peripheral portion 222 is relatively turned off to appear inside.

n1 = n2, v1 = v2

n1 = density around the screen

n2 = density in the center of the screen

v1 = speed of light in the center of the screen

v2 = speed of light around the screen

The present invention has been made to solve the above problems,

An object of the present invention is to adjust the speed of light by varying the density of the center portion and the peripheral portion of the screen,

It provides a cathode ray tube that improves the quality of the screen by adjusting the speed at which the electron beam reaches the front of the screen to eliminate the phenomenon that the periphery of the screen is turned off.

1 is a cross-sectional view showing a schematic configuration of a typical cathode ray tube.

2 is a cross-sectional view of a conventional panel.

Figure 3 is a cross-sectional view showing the composition of the panel of an embodiment according to the present invention.

Figure 4 is a composition diagram of a panel of one embodiment according to the present invention.

5 is a composition diagram of a panel of one embodiment according to the present invention.

Figure 6 is a composition of the panel of one embodiment according to the present invention.

* Description of the symbols for the main parts of the drawings *

1: stem pin 2: heater

3: cathode 4: first electrode

5: second electrode 6: third electrode

7: fourth electrode 8a: first electrode of fifth electrode

8b: second electrode of fifth electrode 9: sixth electrode

10: Shield Cup 11: B.S.C

12: deflection yoke 13, 14, 15: electron beam

16: shadow mask 17: screen

18: fluorescent screen 200: prior art panel

221: center panel of the prior art

222: panel periphery of the prior art

100: panel according to the invention

121: panel central portion 122: panel peripheral portion

123: high density glass 124: low density glass

Cathode ray tube according to the present invention for achieving the above object,

In a cathode ray tube comprising an electron gun for emitting an electron beam and a panel having a fluorescent surface,

The panel is characterized in that the density difference is formed in the central portion and the peripheral portion of the screen.

In one embodiment of the present invention,

The panel is characterized in that the composition by partially compressing the glass.

In one embodiment of the present invention,

The panel is characterized by using two kinds of glass of different densities.

In one embodiment of the present invention,

The panel is characterized in that the composition by inserting a material having a different density.

Hereinafter, an embodiment of a cathode ray tube of the present invention will be described in more detail with reference to the accompanying drawings.

Electrons 13, 14, and 15 emitted from the electron gun generate collision light with the phosphor 18. At this time, if the density difference is given to the center of the screen and the periphery of the screen, the speed of light is changed.

When the CRT is turned on, a constant voltage is applied to each electrode of the electron gun, and a constant voltage is also applied to the cathode 3 and the heater 2.

The voltage applied to the cathode 3 is a cutoff level voltage and depends on the type of tank gun.

As described above, when a voltage is applied and a signal is input to the cathode 3, electrons 13, 14, and 15 are emitted from the cathode.

The emitted electrons propagate toward the center and the outside of the screen by the deflection yoke 12.

These electrons collide with the red, green, and blue phosphors 18 to emit light, and the light passes through the panel glass, which is another medium, to reach the front of the flat screen (see FIG. 1).

3 is a cross-sectional view showing the configuration and composition method of the panel 100 according to an embodiment of the present invention. When the panel is formed, the screen center portion 121 is strongly compressed to increase the density n2 to increase the speed of light (v2). Slowing down, the peripheral portion 122 serves to correct the appearance of the screen by turning the light velocity v1 at a low density n1 to make the overall screen arrival speed the same.

n1 <n2, v1> v2

n1 = density around the screen

n2 = density in the center of the screen

v1 = speed of light in the center of the screen

v2 = speed of light around the screen

FIG. 4 shows another embodiment of the present invention, in which two high-density glass 123 and low-density glass 124 are attached to the electron moving direction when forming a panel.

This increases the density n2 at the center of the screen and slows down the speed of light v2.

On the contrary, the density n1 of the periphery of the screen is lowered, so that the speed of light v1 is increased, thereby making the overall flat image.

5 is another embodiment of the present invention, a panel having a glass with different densities was prepared in the middle.

That is, the high density glass 123a was formed in the center part, and the low density glass 124a was positioned so that it might be located in a periphery part.

In addition, the center of the screen has a higher density n2 and a slower speed of light v2.

On the contrary, the density n1 of the periphery of the screen is lowered, so that the speed of light v1 is increased, thereby making the overall flat image.

FIG. 6 illustrates another embodiment of the present invention, in which a panel was manufactured by inserting photocurable resins 123b and 124b having different densities on the panel 125.

In the middle of the screen, the density (n2) increases and the speed of light (v2) slows down.

On the contrary, the density n1 of the periphery of the screen is lowered, so that the speed of light v1 is increased, thereby making the overall flat image.

Look at the working state of the present invention having such a configuration.

As described above, the panel center portion 121 has a high density, and the peripheral portion 122 has a low density. The panel 100 has a constant density, unlike the panel 200 of the related art. (v2) is slow, the speed of light passing through the peripheral portion (v1) has a high speed to adjust the appearance of the screen is turned off as a whole, to create a flat image to improve the quality of the screen.

As described in detail above, the cathode ray tube according to the present invention includes a cathode ray tube having an electron gun composed of a cathode and an electrode and having a panel configured to be flat on the outside thereof.

When the panel is formed, by adjusting the density of the central and peripheral parts by adjusting the speed of light arrival,

This technology has the advantage of improving the quality of the flat screen by preventing the peripheral screen from turning off and forming a flat screen.

Claims (4)

In a cathode ray tube comprising an electron gun for emitting an electron beam and a panel having a fluorescent surface, The panel is a cathode ray tube, characterized in that the density difference is formed in the center portion and the peripheral portion of the screen. The method of claim 1, The panel is formed by partially compressing the glass cathode ray tube The method of claim 1, The panel is a cathode ray tube, characterized in that the composition using two kinds of glass of different densities. The method of claim 1, The panel is a cathode ray tube, characterized in that the composition by inserting a material having a different density.