KR980011632A - Cathode structure and electron gun for cathode ray tube using same - Google Patents

Abstract

A cathode structure and an electron gun using the cathode structure are disclosed. The electron gun using the cathode structure includes a cathode structure constituting a triode portion, a control electrode and a screen electrode, a plurality of focussing electrodes constituting an auxiliary lens and a main lens, and a final accelerating electrode. The cathode structure includes a rim- And a plurality of fins each having an end portion protruding from the upper surface of the insulating member and bent toward the support hole, the plurality of fins being fixed to the insulating member, And a support member which is fixed to the rim electrode member and presses the field emission device unit inserted into the through hole toward the contact portion, the field emission device unit comprising: And it can improve the structural strength.

Description

Cathode structure and electron gun for cathode ray tube using same

Since this is a trivial issue, I did not include the contents of the text.

It is an object of the present invention to provide a negative electrode structure which is structurally stable and can be easily manufactured due to its simple manufacturing process and an electron gun for a color cathode ray tube using the same.

Figure 1 is a cross-sectional view of a typical cathode ray tube.

FIG. 2 is a sectional view of a conventional electron gun. FIG.

FIG. 3 is a cross-sectional view of a conventional negative electrode structure. FIG.

FIG. 4 is a perspective view showing another embodiment of a conventional negative electrode structure. FIG.

FIG. 5 is a cross-sectional view of a field emission device unit. FIG.

6 is a sectional view of an electron gun according to the present invention;

FIG. 7 is an exploded perspective view of a cathode structure according to the present invention; FIG.

FIG. 8 is a cross-sectional view of the cathode structure shown in FIG. 7; FIG.

DESCRIPTION OF THE REFERENCE NUMERALS

70: cathode structure 71: electrode member

72: insulating member 73: pin

75: Field emission device unit 76: Support member

According to an aspect of the present invention,

A rim-shaped electrode member,

A plurality of fins having a contact portion which is fixedly inserted in the insulating member and has an end protruding from the upper surface of the insulating member and bent toward the support hole, And a support member which is fixed to the rim electrode member and presses the field emission device unit inserted into the through hole toward the contact portion side, the field emission device unit being inserted into the through hole and being in contact with the contact portion of the pin, .

In the electron gun for a color cathode ray tube of the present invention,

Wherein the negative electrode structure comprises a rim-shaped electrode member, and a plurality of focus electrodes constituting the auxiliary lens and the main lens, wherein the negative electrode structure includes a rim-shaped electrode member, A plurality of fins having a contact portion that is fixedly inserted into the insulating member and has an end protruding from the upper surface of the insulating member and bent toward the support hole,

A support member for supporting the field emission device unit fixed to the rim electrode member and inserted into the through hole to the contact portion side, the field emission device unit being inserted into the support hole, .

An electron gun for a cathode ray tube equipped with a cathode structure according to the present invention is shown in Figs. 6 and 7. Fig.

The electron gun constitutes a triode portion and includes a cathode structure 70, a control electrode 81 and a screen electrode 82, a focus electrode 83 sequentially formed from the screen electrode 82 and constituting an electron lens, And a final accelerating electrode (84). A plurality of the focus electrodes 83 may be provided to constitute a plurality of electron lenses for converging and accelerating the electron beams. 7 and 8, the upper surface of the cathode structure 70 is exposed and inserted into the inside of the can-shaped rim-shaped electrode member 71 having the upper surface opened, There is provided an insulating member 72 having a support hole 72a into which the field emission device unit is inserted. A plurality of pins 73 are immersed in the insulating member 72. An upper end of the pin 73 protrudes from the upper surface of the insulating member 73 to form a contact portion 73a bent toward the support hole 72a And the lower end of the pin 73 protrudes to the lower surface of the insulating member. A field emission device unit 75 is installed in the support hole 72a of the insulating member 72 and a supporting member 76 is inserted into the rim electrode member 71 to be inserted into the support hole 72a. To the contact portion 73a side of the pin 73. The contact portion 73a of the field emission device unit 75 is pressed against the contact portion 73a. The support member 76 includes a pressing portion 76a inserted into the insulating member 72 and in contact with the field emission device unit 75 and a fixing portion 76b extending from the pressing portion 76a and fixed to the inner surface of the electrode member. (76b).

On the other hand, the field emission device unit 75 is provided with three field emission units 75a at predetermined intervals on the substrate, and a terminal 75b for applying a predetermined potential to the field emission devices Is installed. Here, the electron emitting portion is not shown in the drawing, but the substrate is made of silicon or the like, and a plurality of metal tips mainly composed of molybdenum are formed on the substrate. And around the metal tip Is formed. Here, the metal tip is exposed to the outside because an insulating layer is formed around the metal tip. A metal layer having a gate is formed on an upper surface of the insulating layer that is exposed to expose the metal tip. Since the current per one metal tip provided on the rear substrate is about 50 nA to 100 nA, if the metal tip is at least 10,000 or more, 1 mA or more can be obtained, so that sufficient current is generated to excite the fluorescent film with the cathode ray. With current technology, 100 million metal tip devices per 1 cm 2 are possible directly. Therefore, the number of the metal tips formed in the same area as the electron beam passing holes formed in the control electrode is about 3,000 to 3,000,000, which is enough to be used as the cathode of the electron gun.

The cathode structure according to the invention constructed as described above and the electron gun for a color cathode ray tube using the cathode structure will now be described.

The cathode structure according to the present invention and the cathode ray tube using the cathode structure will be described as follows.

The electron gun having the cathode structure according to the present invention is mounted on the funnel neck portion of the cathode ray tube and has a predetermined structure in which the electrodes, that is, the screen electrode 82, the focus electrode 83 and the final angular velocity electrode 84, When a potential is applied, an electron lens is formed between the electrodes. A predetermined potential is applied to the field emission device unit of the cathode structure 70 through the tip, and an electron beam is emitted from the metal tip when an electric field is applied to the screen electrode 82. The electron beam emitted as described above is converged and accelerated while passing through the electron lens formed between the above-described electrodes, deflected by the deflection yoke, and landed on the fluorescent spot of the fluorescent film to excite the fluorescent film.

The cathode structure to be operated as described above and the electron gun having the cathode structure have the following operational effects.

first; Since the predetermined potential is applied to the screen electrode of the electron gun and the thermoelectrons are emitted from the metal tip of the cathode structure, the time from the cathode structure to the normal thermoelectron emission can be shortened. The shortening of this time shortens the initial display time of the cathode ray tube.

second; A supporting hole is formed in the insulating member of the cathode structure and the exiting device is inserted into the supporting hole so that the terminal is brought into close contact with the contact portion of the pin so that the wire bonding process for electrically connecting the pin and the field emission device is eliminated have.

third; Since the terminal formed on the edge of the substrate of the field emission device unit and the contact portion are directly in contact with each other, it is possible to prevent the external impact from being applied to the field emission device unit or the falling of the field emission device in a high current region.

fourth; Structural emphasis is improved and structurally stable. fifth; The components constituting the cathode structure are thermally expanded according to the heating of the cathode structure as in the prior art, thereby preventing the shear drift phenomenon in which the electron beams are moved. As described above, the cathode structure of the present invention and the electron gun using the cathode structure of the present invention are not limited to the above-described embodiments, but can be modified by those skilled in the art within the technical scope of the present invention.

The present invention relates to a cathode structure for emitting electrons and an electron gun for a cathode ray tube using the cathode structure. 1, a conventional cathode ray tube comprises a panel 10 on which a fluorescent film is formed on an inner surface thereof, and an electron gun 30 and a deflection plate 22 which are sealed to the panel 10 and which are connected to the neck portion 21 and the cone portion 22, And a yoke (23) is provided with a furnace funnel (20). In the cathode ray tube thus configured, the electron beam emitted from the electron gun 30 is deflected by the deflection yoke 23 and is scanned into the fluorescent film, thereby exciting the fluorescent film to form an image.

FIG. 2 shows an embodiment of an electron gun mounted on a neck portion of the funnel to emit thermoelectrons.

The electron gun includes a cathode structure 40, a control electrode 32 and a screen electrode 33 constituting a triode portion, a focus electrode 34 sequentially formed from the screen electrode 33 to form an electron lens, (35). The electron gun 30 configured as described above emits thermoelectrons from the cathode structure 40 by applying a predetermined voltage to the cathode structure and the electrodes, and an electron lens is formed between the electrodes 32-35 . Therefore, the electron beam emitted from the cathode structure 40 is converged and accelerated while passing through the electron lens formed between the respective electrodes.

The beam current density of the electron beam emitted from the electron gun and the time until the electron beam is normally emitted is dominated by the cathode structure 40. Therefore, in the electron gun, the cathode structure 40, which is the source of electrons, will be most important.

FIG. 3 is a cross-sectional view illustrating the above-described conventional negative electrode structure.

The cathode structure 40 includes a cylindrical sleeve 41, a cap member 42 fixed to the end of the sleeve 41, and an electron emissive material layer (not shown) coated on the upper surface of the cap member 42 A heater 43 inserted into the cylindrical sleeve 41 and a holder 45 supporting the sleeve 41 from below.

In the conventional cathode structure 40 constructed as described above, the heater 44 generates heat when a predetermined electric potential is applied to the heater 44. The heat generated from the heater 44 is transferred to the cap member 42, the sleeve 41 and the holder 45 so that they are heated. When the cap member 42 is heated to about 800 degrees, The heated thermionic emissive material layer 34 is heated so that the thermoelectrons are emitted.

As described above, the cathode structure that emits thermions has the following problems.

first; Since the cap member and the sleeve are heated by the heat generated from the heater and the thermionic emission material is heated, the time until the thermon-electron is normally generated is long. This time means that the launch time of the screen is increased when it is attached to the cathode ray tube (normally, it takes 8 to 9 sec.).

second; The thermal drift phenomenon and the convergence drift phenomenon due to the thermal expansion of the cap member and the slit of the cathode structure occur, and thus the trajectory of the electron beam is corrected after the aging process of the electron gun.

third; The power consumption (2 to 4 watts) for heating the thermionic emissive material layer is required.

fourth; In the case of a color cathode-ray tube, the time difference between the initial thermal expansion of the components constituting the cathode structure of each electron gun, that is, the cap member, the sleeve, the control electrode, and the screen electrode, for exciting three red, The white balance (white balance degree) stabilization time is long. In order to solve such a problem, a cathode structure using a field emission array has been developed. 4, the negative electrode structure includes a rim-shaped electrode member 51, an insulating member 52 inserted into the rim-shaped electrode member 51, and an upper end fixedly connected to the insulating member 52 A field emission device unit 60 fixed to the upper surface of the insulating member 52 by bonding or the like and a plurality of fins 53 exposed on the upper surface of the electric field extinguisher unit 60, And a wire 54 connected to the pin 53 and the terminal 61 of the field emission device unit.

The field emission unit is provided with three field emission units on an in-line basis on a substrate. The field emission unit includes a base member 62 as shown in FIG. 5, A plurality of metal tips 64 formed on the upper surface of the cathode electrode layer 63 and an insulating layer 63 formed on the base member 62 such that the metal tip 64 is exposed, And a metal layer 66 having a gate 66a to expose the metal tip 64 on the upper surface of the insulating layer 65. The metal layer 64 is formed on the metal layer 64,

In the cathode structure constructed as described above, when a predetermined potential is supplied through the fin (53), electric field electrons are emitted from the metal tip (64).

However, in the cathode structure 60 using the field emission device constructed as described above, since the terminal 61 of the field emission device network and the end of the pin 53 fixed to the insulating member are connected by the wire 54, . That is, if a high voltage is applied to the wire 54 or an impact is applied from the outside, there is a problem that the wire 54 is easily broken. Since the diameter of the wire 54 is about 1 mil (1 mil = 0.0254), the wire 53 is connected to the end bar of the field emission device unit through the wire bonding process used in the semiconductor manufacturing process. Therefore, the work process is relatively complicated and productivity can not be improved.

Claims (6)

A plurality of electrode members each having a rim-shaped electrode member and a support hole penetratingly inserted into the electrode member; and a plurality of contact members each having an end portion protruding from the upper surface of the insulating member and bent toward the support hole, A field emission device unit inserted into the support hole and having a terminal provided at an edge of the field emission device in close contact with the contact portion of the pin; and a field emission device unit fixed to the rim electrode member and inserted into the through hole, And a supporting member for pressing the cathode member. The field emission device of claim 1, wherein the field emission device unit comprises a substrate, spaced apart from the substrate by a predetermined distance, three field emission units, And a terminal in contact with the contact portion. 2. The field emission device according to claim 1, characterized in that the support member includes a pressing portion inserted into the support hole to press the field emission device, and a process portion attached to a side surface of the rim electrode member extending from the pressing portion Structure. 1. An electron gun for a color cathode ray tube comprising a cathode structure, a control electrode and a screen electrode constituting a triode portion, a plurality of focus electrodes and a final acceleration electrode constituting an auxiliary lens and a main lens, wherein the cathode structure comprises a rim- A plurality of fins having a contact portion which is fixedly inserted in the insulating member and has an end protruding from the upper surface of the insulating member and bent toward the support hole, And a support member which is fixed to the rim electrode member and presses the field emission device unit inserted into the through hole toward the contact portion side, And a cathode. 5. The field emission device according to claim 4, wherein the field emission device unit comprises a substrate, a plurality of field emission portions spaced apart from the substrate by a predetermined distance, And a terminal which is in contact with the contact portion. 2. The field emission device according to claim 1, characterized in that the support member includes a pressing portion inserted into the support hole to press the field emission device unit, and a fixing portion attached to the side surface of the rim electrode member extending from the pressing portion Electron gun for cathode ray tube. ※ Note: It is disclosed by the contents of the first application.