KR20010095590A - Electronic Gun of Cathode-Ray Tube - Google Patents

Abstract

PURPOSE: A CRT electron gun is provided to achieve an enhanced resolution by expanding the diameter of the electron beam passage of the grid electrode, while improving work efficiency by eliminating the procedure for installing electrode connection member for applying voltage to the grid electrode. CONSTITUTION: A CRT electron gun comprises a cathode having a heater and which emits electrons; a plurality of grid electrodes for controlling the volume of the electron emission, and accelerating and focusing operation for the emitted electrons; an insulating support member(440) installed at upper and lower ends of the grid electrode, and which maintains constant spacing between grid electrodes; and a resistor(450) connected to the insulating support member, and which divides the high voltage applied from an external anode terminal and applies the divided voltage to the relevant grid electrode. The insulating support member has a surface with a convex-concave groove so as to allow the resistor to be inserted partially or in its entirety into the convex-concave groove.

Description

Electronic Gun of Cathode Ray Tube {Electronic Gun of Cathode-Ray Tube}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electron gun for a cathode ray tube, and in particular, a bead glass (hereinafter, referred to as an "insulation support") for holding and fixing a plurality of electrodes at a predetermined interval and a constant voltage of a high voltage at a corresponding grid electrode by combining with the insulation support The present invention relates to an electron gun for a cathode ray tube, which is manufactured by applying a resistor to each uneven shape and inserting a resistor into an insulating support.

1 is a side view showing a cross section of a general color cathode ray tube, and FIG. 2 shows a grid electrode and an insulating support portion of an electron gun according to the prior art, FIG. 2A is a plan view, and FIG. 2B is a side view.

As shown in FIG. 1, the cathode ray tube has a fluorescent surface coated with red, green, and blue phosphors on an inner surface of the panel 10, and a funnel having an electron gun 40 enclosed in a neck 50 behind the panel 10. 30) It is fused by this glass and keeps the inside of high vacuum about 10 ^-7 Torr.

The shadow mask 60, which serves as color screening of the electron beam scanned by the electron gun 40, is fixed to the support frame 70 at a portion proximate to the fluorescent surface 20 of the inner surface of the panel.

In addition, a deflection yoke 80 is provided at the interface between the funnel 30 and the neck 50 to deflect the electron beam scanned by the electron gun 40 to the entire fluorescent surface, and the electron beam is precisely positioned on the outer surface of the neck 50. 2, 4 and 6 pole magnets 90 are provided to modify the traveling trajectory to strike a predetermined phosphor, and an anode for applying a high voltage constant voltage to the grid electrode of the electron gun 40 on the funnel 30. The terminal 35 is provided.

In the cathode ray tube configured as described above, the electron gun 40 radiating the electron beam has a cathode 41 which emits an electron beam by heating the heater as the voltage is applied, as shown in FIGS. 2A and 2B, and is close to the cathode 41. A first electrode 42-1 which is installed to control the amount of radiation of the electron beam, a second electrode 42-2 which is installed in proximity to the first electrode and accelerates the emitted electron beam, and a proximity to the second electrode Third and fourth electrodes 42-3 and 42-4 installed to form a shear focusing lens, and fifth and sixth electrodes 42 installed to form a capacitive focusing lens in proximity to the fourth electrode. -5 ', 42-5 ", 42-6, and a shield cup 43 fixed to the sixth electrode 42-6 to shield external and magnetic fields, which are insulated support 44 ) To maintain a constant interval.

Each of the electrodes is supplied with a different voltage through a connector 47 connected through a stem pin 49 fixed to the stem 48. The stem 48 is sealed to the neck 50.

Accordingly, when the electron gun 40 is supplied with power from the stem pin 49 to the heater in the cathode 41 and the heater generates heat, the hot electrons are emitted from the electron emission material applied to the tip of the cathode 41.

The emitted electrons are accelerated and focused while passing through the plurality of grid electrodes 42-1 to 42-6, pass through a shadow mask 60 that performs color screening, and then collide with the fluorescent surface 20 to emit phosphors. The screen is reproduced.

In this case, in order to reproduce the image, the electron beam must be sequentially scanned over the entire area of the screen. For this purpose, a self-focusing deflection yoke 80 using a non-uniform magnetic field is applied.

As described above, in the electron gun 40 composed of a plurality of electrodes, the beam shape is different due to the distance between the center and the periphery of the screen, and the resolution of the periphery is degraded due to the phenomenon. do.

In order to improve the resolution of such a periphery of the screen, a dynamic voltage is usually applied to the fifth electrode 42-5 '' synchronized with the deflection current, and a high voltage is applied to the sixth electrode 42-6 adjacent thereto. In addition, a constant voltage is applied to the other electrodes 42-1 to 42-5 ', and the high voltage is applied from the anode terminal 35 of the cathode ray tube and is applied through embedded graphite embedded in the cathode ray tube. The same voltage and constant voltage are applied from the stem pin 49.

At this time, two different high constant and dynamic voltages are applied to the 5-1 electrode 42-5 'and the 5-2 electrode 42-5' ', respectively, so that the stem pin 49 may interact with each other. Discharge of the liver occurs and ultimately not only increases the defect of the cathode ray tube but also damages the driving circuit.

Therefore, only a low voltage is applied from the stem pin 49, a high voltage is applied to the resistor 45 from the anode terminal 35 of the cathode ray tube, and the voltage is divided by the resistor 45 to divide the voltage required for each grid electrode. It was configured in the form of supplying.

The resistor 45 is attached to the outside of the insulating support 44, the end is attached to the shield cup 43 is configured to receive a high voltage, the electrode connecting portion 46, 46 to apply the required voltage to each electrode ') Is welded to each electrode 42-5', and the sixth electrode 42-6 is connected to the shield cup 43 to receive a high voltage directly from the shield cup 43.

In addition, the electron gun 40 to which the resistor 45 is attached has a discharge phenomenon when the distance from the inner wall of the neck 50 is too close, which causes damage to the resistor 45 and thus deteriorates the breakdown voltage characteristic of the cathode ray tube. Therefore, it maintains a gap of about 1mm.

As described above, in order to maintain a constant distance between the electron gun and the inner wall of the neck, the size of the entire electron gun is slightly reduced compared to the prior art.

Therefore, as shown in FIG. 2 and FIG. 3, the electrode having a electron gun having the same outer diameter as the conventional one is placed on the upper surface of the insulating support 44, and applies a constant voltage and an electrode for applying a dynamic voltage in synchronization with the deflection current. When a built-in electrode and an electrode to which a high voltage is applied are embedded in the neck, it becomes difficult to maintain a constant distance from the neck inner wall.

In general, when the thickness of the resistor 45 is 1mm, the gap becomes close to 1mm or less, and thus, a discharge phenomenon occurs due to the electrostatic action between the electron gun and the inner surface of the neck, which affects the electron beam path. As a result, the resolution of the cathode ray tube is degraded. If the discharge phenomenon is severe, the cathode ray tube is defective and the driving circuit is destroyed.

Therefore, in order to solve the above problem, the thickness of the insulation support 44 of the entire electron gun must be reduced by the thickness of the resistor 45. For this purpose, the size of each grid electrode of the electron gun must also be reduced.

If the size of the grid electrode is reduced as described above, the breakdown voltage characteristics due to the discharge can be maintained as in the prior art, but at this time, the size of the through hole of the grid electrode, which is the main factor for determining the resolution of the electron gun, must be reduced, resulting in an outer diameter of Φ29. At 1mm, the outer diameter of the electron gun is usually manufactured to be about 21.0mm, but since the resistor 44 is attached, the outer diameter of the opposite side where the resistor 44 is not attached must also be reduced to maintain balance, resulting in a reduction of about 2mm. The total outer diameter of the electron gun is about Φ19.0 mm.

Therefore, as a result, when using the resistor 45 while maintaining the inner diameter of the electron gun, a problem of a breakdown voltage occurs, and to solve this problem, if the outer diameter of the electron gun is reduced, the problem of deteriorating the resolution characteristic is caused by the reduction of the electron beam through hole. Will occur.

In addition, when connecting the electrode connecting portion 46 of the resistor 45 and the grid electrode 42-5 ′ as shown in FIG. 3C, the electrode connecting portion 46 is mounted on the outer wall of the resistor 45 and the insulating support 44. Since welding and fixing should be performed on the electrode 42-5 ', workability due to welding work is deteriorated and flow and gap change of the electrode are generated due to the application of a strong force in the work, and thus the breakdown voltage characteristics and resolution are deteriorated. Problems deteriorating the reliability of the tube have occurred.

Accordingly, an object of the present invention is to insulate the entirety or a part of the resistor after the insulation support for maintaining the fixed plurality of electrodes at a predetermined interval and the resistor for applying a high voltage to the grid electrode in combination with the insulating support to form a concave-convex shape. The present invention provides a cathode ray tube electron gun which can expand the outer diameter of the electron gun and the passage hole of the electron beam, thereby further improving the productivity and reliability of the electron gun.

Technical means of the present invention for achieving the above object is a cathode having a predetermined heater to emit electrons, a plurality of grid electrodes for controlling the radiation amount, acceleration and focus of the electrons, and the image of the plurality of grid electrodes In the electron gun provided at the bottom having an insulating support for holding and coupling each electrode at a predetermined interval, and a resistor connected to the insulating support to divide the voltage applied to the grid electrode to the grid electrode, It is characterized in that the groove is formed on the surface of the insulating support to which the insulating support and the resistor are connected, and the whole or a part of the resistor is inserted into the groove and joined.

1 is a side view showing a cross section of a general color cathode ray tube,

FIG. 2 illustrates a grid electrode and an insulator support portion of an electron gun according to the prior art, FIG. 2A is a plan view, and FIG. 2B is a side view,

3 is a view showing the individual structure of the insulating support and the resistor according to the prior art and the coupling state thereof,

Figure 4 shows a part of the structure of the electron gun according to the present invention, Figure 4a is a plan view, Figure 4b is a side view,

5 is a view showing the structure of the insulating support according to an embodiment of the present invention,

6 is a view showing the structure of a resistor according to an embodiment of the present invention,

7 is a view illustrating a coupling state and an electrode connection state of FIGS. 5 and 6.

Explanation of symbols on the main parts of the drawings

35: anode terminal 40: electron gun

41: cathodes 42-1 to 42-6: grid electrodes

43: shield cup 44,440: bead glass

45,450: resistor 46,460: electrode connecting means

47: connector 48: stem

49: stem pin 50: neck

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

FIG. 4 illustrates a partial structure of an electron gun according to the present invention. FIG. 4A is a plan view, FIG. 4B is a side view, and the same view shows a plurality of grid electrodes 42-1 to 42-6 and an insulating support 440. And a resistor 450 and electrode connecting means 460.

The plurality of grid electrodes 42-1 to 42-6 are provided in proximity to a predetermined cathode 41 to control a radiation amount of an electron beam emitted from the cathode, and the first electrode ( A second electrode 42-2 which is installed close to 42-1 to accelerate the emitted electron beam, and third and fourth which are installed close to the second electrode 42-2 to form a shear focusing lens. The electrodes 42-3 and 42-4 and the fifth and sixth electrodes 42-5 and 42-6 which are provided in close proximity to the fourth electrode 42-4 to form the electrostatic focusing lens. They are provided while maintaining a constant distance from each other by an insulating support 440 of insulating material provided on the upper and lower ends of the grid electrodes 42-1 to 42-6, respectively.

That is, upper and lower edge portions of each of the electrodes 42-1 to 42-6 are inserted into the insulating support 440 provided at the upper and lower ends thereof, respectively, and are fixed while maintaining a constant distance between the electrodes.

Each of the electrodes is supplied with a different voltage through a connector 47 connected through a stem pin 49 fixed to the stem 48. The stem 48 is sealed to the neck 50.

In addition, a resistor 450 is attached to an upper end of the insulating support 440, and the resistor 450 receives a high voltage applied from the anode terminal 35 and the shield cup 43 by predetermined electrode connection means 460 and 460. The voltage is divided by the grid electrode (the fifth electrode and the sixth electrode) and applied to the grid electrode.

A characteristic of the present invention made as described above is in the structure of the insulating support 440 and the resistor 450, the structure of the other cathode 41, grid electrodes 42-1 to 42-6 and the stem 48 Is similar to the same as the conventional one.

Figure 5 shows the structure of the insulating support according to an embodiment of the present invention, Figure 6 shows the structure of a resistor according to an embodiment of the present invention, Figure 7 is a combined state of Figures 5 and 6 and A diagram showing an electrode connection state.

As shown in the side and plan views shown in FIGS. 5A and 5B, the insulating support 440 is provided with grooves having an uneven shape on the upper surface thereof, and a specific position of the grooves. Grooves are formed to pass through the electrode connecting means 460 for connecting with the grid electrodes.

6A and 6B, the resistor 450 has a convex-convex projecting shape, unlike the prior art as shown in FIGS. 6A and 6B, and the shield cup at a predetermined position of the projecting part. The grooves through which the electrode connecting means 460 passes and the holes are formed in the grooves for supplying the high voltage applied from (43) to the grid electrodes 42-5 '. Have

In addition, the reference numeral 460 'in the same figure is a conductor such as an electric wire for electrically connecting the electrode connecting means 460.

The resistor 450 configured as described above is coupled to the upper part of the insulating support 440 as shown in FIGS. 7A and 7B, and the protrusion of the resistor 450 is connected to the groove of the insulating support 440. The grooves and holes of the resistor 450 are positioned on the same vertical line as the grooves of the insulating support 440 by being inserted into and attached to the grooves.

Then, as shown in FIG. 7A, the electrode connecting means 460 is embedded through the hole and the groove of the resistor 450 and the groove of the insulating support 440 to provide the high voltage provided from the anode terminal 35. The high voltage divided by the resistor 450 is applied to the grid electrode 42-5 ′ by interconnecting the grid electrode 42-5 ′ embedded in the insulating support 440.

That is, the grid electrode 42-5 ′ receiving the high voltage from the resistor 450 protrudes to the outer surface through the groove of the insulating support 440 when the grid electrode 42-5 ′ is embedded in the insulating support 440. When the 450 is coupled to the insulating support 440, the electrode connecting means 460 embedded through the hole of the resistor 450 protrudes to the outer surface of the insulating support 440 and the grid electrode 42-5 ′. To make contact.

As described above, the specific grid electrode 42-5 ′ is driven by receiving a divided voltage through a resistor 450 installed for voltage division of the high voltage applied from the anode terminal 35 and the shield cup 43. .

In other words, as shown in FIG. 7A, the grid electrodes 42-5 ′ are embedded in the insulating support 440 to pass through the grooves formed in the grooves to protrude to the outer surface, thereby providing a plurality of grid electrodes 42-1. The protrusions of the resistor 450 are inserted into the grooves of the insulating support in the state of being embedded and fixed in the insulating support 440 together with ˜42-4, 42-5 ″, 42-6). In addition, the grid is embedded in the insulating support 440 by embedding the electrode connecting means 460 connecting the high voltage applied from the shield cup 43 through holes and grooves formed in the resistor 450. It is electrically connected to the electrode 42-5 '.

By assembling the electron gun in the same manner as described above, deformation and spacing of the grid electrodes due to the repulsive force received when the plurality of grid electrodes 42-1 to 42-6 are embedded in the insulating support 440, unlike in the related art. Changes can be eliminated, and the resistor 450 is coupled to the insulating support 440 and the electrode connecting means 460 through the holes of the resistor 450 to the groove of the insulating support 440. ) And the separate electrode connection work can be omitted by connecting to the grid electrode 42-5 '.

In addition, when the insulation support 440 and the resistor 450 are coupled to each other, a portion of the resistor 450 may be inserted into the insulation support 440 to reduce the total outer diameter of the electron gun based on a predetermined inner diameter of the neck. The electron beam passage diameters of the grid electrodes 42-1 to 42-6 can be further expanded by the reduced diameter.

In general, when the outer diameter of the neck is Φ29.1mm, the outer diameter of the electron gun is maintained at Φ21.0mm, which is the maximum size that maintains the withstand voltage characteristics by discharging the inner wall thickness of the neck. In particular, the reduced size of the through-holes of the fifth electrode 42-5 ', 42-5' 'and the sixth electrode 42-6 can be expanded, and the resolution of the cathode ray tube can be improved accordingly. .

In addition, although the present invention is applied to the 5-1st electrode 42-5 'as in the embodiment, the present invention can be applied to other grid electrodes according to the design and the requirements thereof.

Although specific embodiments of the present invention have been described and illustrated above, the resistors may be configured in an uneven shape and the insulating support may be formed in a protruding shape, respectively, or may be coupled to each other, or the electrode connecting means may be formed in the internal grooves and holes of the resistor. Rather than directly connecting the grid electrode embedded in the insulating support to connect the wire through the outer wall of the resistor and the insulating support as in the prior art, the present invention may be variously modified and implemented by those skilled in the art. It is obvious.

Such modified embodiments should not be individually understood from the technical spirit or the prospect of the present invention, and such modified embodiments should fall within the appended claims of the present invention.

Therefore, in the present invention, the insulating support for holding and fixing the plurality of electrodes at a predetermined interval and the resistor for applying a constant voltage to the plurality of electrodes by combining with the insulating support are manufactured in a concave-convex shape to insert a portion of the resistor into the insulating support. In this configuration, the passage diameter of the grid electrode can be enlarged as much as the total outer diameter of the electron gun is reduced, so that the resolution can be further improved, and the work for separately installing electrode connecting means for applying a voltage to each grid electrode. Can be removed to improve work efficiency, further maximizing productivity.

Claims (6)

A cathode provided with a predetermined heater to emit electrons, a plurality of grid electrodes for controlling the radiation amount, acceleration, and focus of the electrons, and upper and lower ends of the plurality of grid electrodes to maintain each electrode at a predetermined interval; An electron gun having an insulating support body to be coupled and a resistor connected to the insulating support body and voltage-dividing a high voltage applied from an external anode terminal to a corresponding grid electrode. An electron gun for cathode ray tube, characterized in that the groove is formed on the surface of the insulating support to which the insulating support and the resistor are connected, and the whole or a part of the resistor is inserted into the groove and combined. The method of claim 1, The resistor is, Electron gun for cathode ray tube, characterized in that consisting of a U-shaped to match the groove of the insulating support. The method of claim 1, The resistor is, Electron gun for cathode ray tube, characterized in that the hole for applying a high voltage to the grid electrode by embedding the predetermined electrode connection means. The method of claim 1, In the groove portion of the insulating support, An electron gun for a cathode ray tube, characterized in that a groove is further formed on the same vertical line as the hole of the resistor. The method of claim 1, Electron gun for cathode ray tube, characterized in that at least one of the grid electrodes embedded in the insulating support projecting outwards through the groove portion of the insulating support. The method according to claim 1 or 5, The grid electrode protruding to the outer surface of the insulating support, Electron gun for cathode ray tube, characterized in that configured to be in contact with the electrode connecting means buried through the hole of the resistor when the resistor is coupled to the insulating support.