KR100822191B1 - Electron gun for colored cathode ray tube - Google Patents

Abstract

According to the present invention, an electron gun for a color cathode ray tube includes: a cathode, a control electrode, and a screen electrode forming a triode; A first electrode group sequentially installed from the screen electrode to form at least one auxiliary lens; The main lens includes a first external electrode member having a large-diameter electron beam passing hole formed on the emission side, and a first internal electrode member disposed inside the first external electrode member to form three independent small-diameter electron beam passing holes. A first electrode, a second external electrode member having a large-diameter electron beam passing hole formed on the side opposite to the first electrode group, and installed inside the second external electrode member to form three independent small-diameter electron beam passing holes. And a second electrode group including a second electrode including a second internal electrode member, and a field extension electrode disposed between the first and second electrodes to extend an electric field forming an electron lens. .

Description

Electron gun for color cathode ray tube {Electron gun for color CRT}

1 is a front view showing an electrode of a conventional electron gun for a cathode ray tube,

2 is a front view showing a conventional electron gun electrode,

3 is a cross-sectional view of a color cathode ray tube employing an electron gun according to the present invention;

4 is a side view of the electron gun shown in FIG.

FIG. 5 is a partial ablation perspective view illustrating extracting electrodes forming the main lens of FIG. 4; FIG.

6 to 8 are perspective views showing embodiments of the electrodes forming the main lens of the electron gun according to the present invention.

The present invention relates to an electron gun for cathode ray tube, and more particularly to an electron gun for color cathode ray tube having electrodes forming a large-diameter electron lens.

In general, in the electron gun for cathode ray tube, spherical aberration and focus characteristics are greatly influenced by the main lens, so the aperture of the main lens should be formed as large as possible to obtain good focus characteristics.                         

However, in the inline electron gun, at least two electrodes forming the electron lens have three electron beam through holes formed in an inline shape, and the diameter of the neck portion of the funnel to which the electron gun is mounted is limited. It is impossible to make the electron beam through hole diameter larger than the eccentric distance. In particular, when the diameter of the neck portion is reduced to 25 mm or less in order to improve the deflection sensitivity of the electron beam emitted from the electron gun, it is more difficult to large-size the electron lens.

Therefore, in order to solve the above-described problems, a structure of an electrode having improved spherical aberration of a large-diameter lens is disclosed in US Patent No. 4,370,592.

The structure of the electrode has a configuration in which the opposite surfaces of the two electrodes are immersed to form a large-diameter electron beam through hole through which three electron beams pass through, and an independent small-diameter electron beam through hole is formed on the bottom thereof.

The electron beam passing through the main lens formed by the electrodes having the above structure passes through the electron beam passing through the independent small diameter electron beam through hole at the center and the independent small diameter electron beam passing hole at both sides because the large diameter electron beam through hole is asymmetrical. Since the vertical and horizontal focusing components of one electron beam were different from each other, it was not possible to uniformly form an electron beam spot landing on the fluorescent surface. And there is a limit to expand the electric field of the large-diameter lens, there is a limit to the expansion of the electric field when the diameter of the neck portion on which the electron gun is mounted is small.

Another example electron gun electrode is disclosed in US Pat. No. 5,414,323. As shown in FIG. 1, the elongated small-diameter electron beam through-hole 13 is formed at the center of the outer electrode 11 having the large-diameter electron beam through-hole as shown in FIG. In order to form the electron beam passing holes 14 and 15, a single electrode piece 16 drawn in an elliptical shape is installed.

The electrode of the electron gun cancels astigmatism by forming a spherical aberration generated in a large diameter in the form of a central independent small-diameter electron beam through hole 13, and enlarges the electric beam through holes 14 and 15 on both sides. Although it can be extended to have a problem that the correction of the comma aberration is not easy.

And another example of a conventional large diameter electrode is disclosed in US Pat. No. 4,626,738. As shown in FIG. 2, the electrode includes an external electrode 21 having a large diameter electron beam through hole formed therein, and a polygonal small diameter electron beam through hole 22R, 22G, 22B formed inside the external electrode 21. The formed internal electrode 22 is included.

The electrode of the electron gun can correct aberrations generated by the large-diameter electron beam through-hole using a polygonal electron beam through-hole, but such an electrode has a problem that it is difficult to manufacture and assemble because the small-diameter electron beam through-hole is formed into a polygon.

In addition, an electron gun for a color water tube for improving astigmatism and convergence characteristics is disclosed in Korean Patent Publication No. 1982-1555.

The electron gun has a peanut-shaped opening formed by overlapping adjacent ends of three circular openings on opposite sides of the focusing electrode and the final accelerating electrode, and the opening is substantially formed by a partition electrode partitioning the two narrowed portions. It is separated into pieces, and the partition electrode has a concave portion that becomes thinner as it goes deeper and bilaterally in the center portion. As described above, the conventional electron gun is difficult to form a peanut-shaped electron beam through-hole consisting of three circular openings, and correction due to cross-sectional distortion of the electron-beam through-hole due to large diameter is not easy.

In addition, electrodes of other conventional electron guns (Korean Patent Application No. 1998-52519 (filed on December 2, 1998)) include an outer rim electrode having a large-diameter electron beam passing hole through which three electron beams pass, and an end of the outer rim electrode. A first and second inner electrode pieces which are installed at an interval spaced inwardly to form three independent small-diameter electron beam passing holes arranged inline inside the outer rim electrode, and in the center of the three electron beam passing holes The inner curvature of the first and second inner electrode pieces forming the independent small-diameter electron beam passing holes positioned has an elliptic curvature larger than the vertical side of the large-diameter electron beam passing holes.

Since the size of the electrodes forming the conventional electron lens as described above is made within a limited diameter of the neck portion, if the diameter of the neck portion is less than 25mm, the enlarged and electric field formed by the large-diameter electron beam through hole and the small-diameter electron beam through hole of the electrodes There is a limit to expanding. This makes it difficult to reduce the spherical aberration of the electron lens formed by the electrodes, and furthermore, the focus characteristic cannot be improved.

The present invention is to solve the above problems, it is possible to extend the electric field of the main lens to improve the focus characteristics and convergence characteristics, for color cathode ray tube having electrodes that are easy to apply to the neck portion having a small diameter The purpose is to provide an electron gun.

The present invention to achieve the above object,

A cathode, a control electrode, and a screen electrode forming a triode;

A first electrode group sequentially installed from the screen electrode to form at least one auxiliary lens;

The main lens includes a first external electrode member having a large-diameter electron beam passing hole formed on the emission side, and a first internal electrode member disposed inside the first external electrode member to form three independent small-diameter electron beam passing holes. A first focus electrode, a second external electrode member having a large-diameter electron beam passing hole formed on the side opposite to the first electrode group, and provided inside the second external electrode member to form three independent small-diameter electron beam passing holes. And a second electrode group including a second focus electrode including a second external electrode member and a field extension electrode disposed between the first and second focus electrodes to extend an electric field forming an electron lens. It is characterized by.

In the present invention, the field extension electrode may include a third external electrode member having a large-diameter electron beam passing hole formed on a side facing the first and second focuses, and formed inside the third external electrode member to form three electron beam passing holes. And a third internal electrode member. At least one of the first, second, and third internal electrodes may be divided into two and installed to be spaced apart from the large-diameter electron beam passing hole by a predetermined distance. Is formed.

Electron gun for color cathode ray tube of the present invention for achieving the above object,                     

It is provided in the neck portion of the cathode ray tube, the cathode, the control electrode, and the screen electrode forming the triode, the first, second, three, four, five focus electrodes forming at least one auxiliary lens, and the fifth focus electrode And a sixth focus electrode, a field extension electrode, and a sixth focus electrode constituting the main lens.

A fifth outer electrode of the fifth focus electrode having a first outer electrode member having a large-diameter electron beam passing hole formed at an emission side, and a third outer small-electron beam passing hole formed inside the first outer electrode member; 1 includes an internal electrode member,

A second external electrode member having a large diameter electron beam through hole formed on a side of the sixth focus electrode that faces the fifth focus electrode, and provided inside the second external electrode member to form three independent small diameter electron beam through holes; A second internal electrode member,

The field extension electrode may include a third external electrode member having a large-diameter electron beam passing hole formed at a side corresponding to the fifth focus electrode and the sixth focus electrode, respectively, and formed inside the third external electrode member to form three electron beam passing holes. It characterized in that it comprises a third internal electrode.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment according to the present invention.

3 shows a color cathode ray tube employing an electron gun according to the present invention.

Referring to the drawings, the color cathode ray tube is a transparent window which has a panel 32 having a screen surface 31 for reproducing an image upon reproduction of a screen, and a predetermined distance from the screen surface 31 within the panel 32. A shadow mask frame assembly 33 to be installed, a funnel 34 encapsulated with the panel 32 to form an outer container of a cathode ray tube, and an electron gun 40 enclosed in a neck portion 36 of the funnel 34. ) And a deflection yoke 38 provided at the cone portion 37 of the funnel 34. Here, the neck portion of the cathode ray tube has a diameter of 21 mm to 25 mm, but is not limited thereto.

Figure 4 shows an embodiment of the electron gun mounted on the neck portion of the cathode ray tube defined as described above.

As shown in the drawing, the electron gun 40 for the color cathode ray tube is sequentially installed from the cathode 41, the control electrode 42, and the screen electrode 43, and the electrode from the screen electrode 43, which constitutes the triode. A first electrode group 50 constituting one auxiliary lens and a second electrode group constituting the first electrode group constituting the main lens positioned on the screen surface 31 side of the cathode ray tube are included.

The first electrode group includes first, second, third, fourth and fifth focus electrodes 51 to 55 sequentially installed from the screen electrode 43. The second electrode group constituting the main lens is the first electrode group. It consists of the emission side of the 5 focus electrode 55, the field extension electrode 56 provided from it, and the 6th focus electrode 57 which is a final acceleration electrode.

The first, second, third and fourth focusing electrodes 51-54 and the fifth focusing electrode 55 forming the control electrode 41, the screen electrode 42, and the first electrode group have electrons on the incidence side 55a. Three electron beam through holes (not shown) are formed on the in-line to form the lens. The electron beam through hole in each of the electrodes is not limited to the above-described embodiment, and various modifications are possible depending on the state of the electron lens and the concentration state of the electron beam.                     

The second electrode group constituting the main lens is shown in FIG. 4.

As illustrated, the first external electrode member is positioned on the emission side 55b of the fifth focus electrode 55 and has a first large-diameter electron beam passing hole H1 formed at a side corresponding to the field extension electrode 56. A first internal electrode member 55c and a first internal electrode member installed at a position spaced a predetermined distance from the large-diameter electron beam passing hole H1 to form three independent small-diameter electron beam passing holes 61R, 61G, 61B. 61).

Meanwhile, the first internal electrode members 61 installed in the fifth focus electrode 55 are first and second electrode members 61a and 61b having small diameter electron beam through holes 61R and 61B, respectively. The first and second electrode members 61a and 61b are spaced apart from each other by a predetermined interval to form an elongated electron beam through hole 61G having upper and lower portions formed therein. The vertical electron beam through hole 61G having the upper and lower portions may be formed by having a plurality of radiuses of curvature or semi-elliptic curved surfaces 61c and 61d formed on opposite surfaces of the first and second electrode members. The curved surfaces 61c and 61d are formed to have the same height as that of the first and second electrode members 61a and 61b or smaller as shown in FIG. 6. The shape of the electron beam through-hole 61G formed in the center and the electron beam through-hole 61R and 61B formed in the first and second electrode members 61a and 61b is not limited by the above-described embodiment, but is circular or elongated. Or may be formed elliptical or a combination thereof. In addition, the first and second electrode members 61a and 61b may be formed to be inclined at a predetermined angle with respect to the center of the electron beam passing hole 61G in the center in order to concentrate the three in-line electron beams in the center portion.

 Herein, at least one of the internal focus first and third internal electrodes 61 and 63 of the fifth focus electrode 55 and the field extension electrode 56 to be described later may be the first and second electrode members as described above. It may be made, as shown in Figure 8 can be formed to be inclined at a predetermined angle with respect to the center of the center electron beam through hole (61G or 63G).

7 illustrates another embodiment of the internal electrode member installed in the fifth focus electrode 55. Of course, the internal electrode member may be installed on at least one side of the 5.6 focus electrode.

Referring to the drawings, an inner electrode member installed on the fifth focus electrode 55 is installed at a portion spaced apart from the end of the first outer electrode member 55c by a predetermined interval, and the inner peripheral surface of the first outer electrode member is disposed. The first and second internal electrode pieces 65 and 66 are formed to form a central electron beam through hole 61R 'and electron beam through holes 61G' and 61B 'on both sides. The first and second internal electrode pieces 65 and 66 may have a sealed shape, and may be formed to be inclined at a predetermined angle with respect to the center of the electron beam passing hole in the center to concentrate the three in-line electron beams.

On the other hand, the sixth focus electrode 57 has a first large-diameter electron beam passing hole H4 formed in the second external electrode member 57a and an independent small-diameter electron beam passing through a position deeply inserted from the large-diameter electron beam passing hole H4. A second internal electrode member 62 is formed which forms the balls 62R, 62G and 62B.

In addition, the field extension electrode 56 passes through the second and third large-diameter electron beams respectively formed on the fifth and sixth focus electrodes 55 and 57 with the fifth and sixth focus electrodes 55 and 57 interposed therebetween. A third internal electrode member 56a having holes H2 and H3 formed therein, and a third internal electrode provided inside the third external electrode member to form three electron beam through holes 63R, 63G, 63B. The electrode member 63 is included.

The sixth focus electrode 57, which is the final accelerating electrode, has a second external electrode member 57a having a fourth large-diameter electron beam passing hole H4 formed on the side corresponding to the field extension electrode 56 and the large diameter therein. And a second internal electrode member 62 provided at a position spaced a predetermined distance from the electron beam passing hole H4 to form three independent small diameter electron beam passing holes 62R, 62G and 62B.

The electron gun according to the present invention configured as described above is applied a predetermined voltage to each electrode, which will be described in detail as follows.

First, a constant voltage VS is applied to the screen electrode 43 and the second focus electrode 52, and a focus voltage higher than the constant voltage VS is applied to the first focus electrode 51 and the fourth focus electrode 54. VF is applied, and a dynamic focus voltage VFD is applied to the third and fourth focus electrodes 53 and 54, and the third and fourth focus electrodes 53 and 54 are higher than the focus voltage. Constant voltage may be applied. The inner focusing film of the cathode ray tube and the enowood voltage VE on the coin are applied to the sixth focus electrode 57, which is the final acceleration electrode, and the field extension electrode 56 is decompressed using a resistor R. Voltage is applied and the resistor is grounded. As described above, the wiring structure for applying a voltage to each electrode constituting the electron gun is not limited to the above-described embodiment and can be variously modified according to the formation state of the electron lens.

Referring to the operation of the electron gun for the color cathode ray tube according to the present invention configured as described above are as follows.

Referring to the operation of the electron gun electrode according to the present invention configured as described above are as follows.

In order to focus and accelerate the electron beam by using the electron gun for the color cathode ray tube according to the present invention, a voltage is applied to each electrode constituting the electron gun using the connection structure as described above.

In this manner, an equipotential line is formed between the electrodes in the normal line direction of the electric force line, thereby forming an electron lens. That is, a prefocus lens is formed between the screen electrode 43 and the first focus electrode, and between the screen electrode and the first, second and third focus electrodes 51, 52, 53 and the third and fourth electrodes. Between the five focus electrodes 53, 54 and 55, a unipotential type electron lens is formed, respectively. In addition, a main lens having an extended electric field is formed between the fifth focusing electrode 55, the field extension electrode 56, and the sixth focus electrode 57 forming the second electrode group. Since the main lens has a field extension electrode 56 for extending an electric field between the fifth and seventh focus electrodes 56 and 57, the first and second large-diameter electron beam passing holes H1 and H2 and A multistage large diameter lens is formed by an electric force line and an equipotential line extended by the 3, 4 large diameter electron beam passing holes H3 and H4.

In particular, since the enoud voltage VE applied to the sixth focus electrode 57 is reduced and applied to the field extension electrode 56, the magnification is weakened because the voltage difference is not increased between the fourth and seventh focus electrodes. It is possible to form a large diameter lens. The large-diameter lens thus formed has a weakened magnification, so that spherical aberration components can be reduced. Meanwhile, one of the first, second and third internal electrodes 61, 62, and 63 electrodes provided inside the first, second and third external electrode members 55c, 56a, and 57a constituting the main lens is Since it is formed to be inclined at a predetermined angle with respect to the central electron beam through-hole, the electron beams of both sides which are arranged inline and pass through the main lens can be converged to the central electron beam side.

One of the first, second and third internal electrodes 61, 62 and 63 is divided into first and second electrode members 65 and 66 or the first and second electrode piece members 65 and 66. Since the diameter of the electron beam passing hole in the center can be formed relatively large, the electron beam spot characteristic landing on the fluorescent film of the cathode ray tube can be improved, and the first and second electrode piece members and the first and second electrode members are improved. Since has the same shape can reduce the failure rate due to assembly. In addition, when the inner electrode member is formed of the first and second electrode piece members, both electron beam through holes are formed like the inner circumferential surface of the external electrode member, thereby enlarging the electron lens through which both electron beams pass.

As described above, the electron gun for the color cathode ray tube according to the present invention can expand the electric field forming the main lens to compensate for the deterioration in focus characteristics caused by the reduction of the main lens according to the reduction in the diameter of the neck portion by expanding the electric field of the main lens. Furthermore, the focus characteristic of the electron beam lanced to the fluorescent film can be improved.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (16)

A cathode, a control electrode, and a screen electrode forming a triode; A first electrode group sequentially installed from the screen electrode to form at least one auxiliary lens; The main lens includes a first external electrode member having a large-diameter electron beam passing hole formed on the emission side, and a first internal electrode member disposed inside the first external electrode member to form three independent small-diameter electron beam passing holes. A first focus electrode, a second external electrode member having a large-diameter electron beam passing hole formed on the side opposite to the first electrode group, and provided inside the second external electrode member to form three independent small-diameter electron beam passing holes. And a second electrode group including a second focus electrode including a second internal electrode member and a field extension electrode disposed between the first and second focus electrodes to extend an electric field forming an electron lens. An electron gun for color cathode ray tubes. The method of claim 1, The field extension electrode may include a third external electrode member having a large-diameter electron beam passing hole formed at a side facing the first and second focus electrodes, respectively, and a third installed inside the third external electrode member to form three electron beam passing holes. Electron gun for a color cathode ray tube, characterized in that it comprises an internal electrode member. The method according to claim 1 or 2, At least one internal electrode member installed in the first and second focus electrodes and the field extension electrode is formed of first and second electrode members each having an electron beam through hole, and the first and second electrode members are spaced apart from each other to form an elongated shape. Electron gun for color cathode ray tube, characterized in that the electron beam through-holes are formed to be formed. The method according to claim 1 or 2, At least one internal electrode member installed inside the first and second focus electrodes and the field extension electrode is disposed at a portion spaced inwardly from an end of any one of the first, second and third external electrode members. An electron gun for a color cathode ray tube, comprising: first and second inner electrode pieces forming three independent small-diameter electron beam passing holes arranged inline in any one of the second and third outer electrode members. The method of claim 3, Electron gun for the color cathode ray tube, characterized in that the first and second electrode member is formed in a circular shape with the upper and lower portions of the electron beam through hole formed spaced apart from each other. The method of claim 3, Electron gun for color cathode ray tube, characterized in that the first and second internal electrode member is formed to be inclined at a predetermined angle to focus the electron beam toward the electron beam side of the center. The method of claim 4, wherein The first and second inner electrode pieces are inclined so as to concentrate the electron beam toward the center electron beam side. It is provided in the neck portion of the cathode ray tube, the cathode, the control electrode, and the screen electrode forming the triode, the first, second, three, four, five focus electrodes forming at least one auxiliary lens, and the fifth focus electrode And a sixth focus electrode, a field extension electrode, and a sixth focus electrode constituting the main lens. A fifth outer electrode of the fifth focus electrode having a first outer electrode member having a large-diameter electron beam passing hole formed at an emission side, and a third outer small-electron beam passing hole formed inside the first outer electrode member; 1 includes an internal electrode member, A second external electrode member having a large diameter electron beam through hole formed on a side of the sixth focus electrode that faces the fifth focus electrode, and provided inside the second external electrode member to form three independent small diameter electron beam through holes; A second internal electrode member, The field extension electrode may include a third external electrode member having a large diameter electron beam through hole formed at a side corresponding to the fifth focus electrode and the final acceleration electrode, and installed inside the third external electrode member to form three electron beam through holes. An electron gun for a color cathode ray tube, comprising a third internal electrode member. The method of claim 8, At least one internal electrode member of the first and second focus electrodes and the field extension electrode is formed of first and second electrode members each having an electron beam through hole, and the first and second electrode members are spaced apart from each other to form an elongated electron beam through hole. Electron gun for a color cathode ray tube, characterized in that formed so as to form. The method of claim 8, At least one inner electrode member of the first, second and third inner electrode members may be installed at a portion spaced inward from an end of any one of the first, second and third outer electrode members. An electron gun for a color cathode ray tube, comprising first and second inner electrode pieces each having an inner circumferential surface of the electrode member and a central electron beam through hole, and each having an independent small diameter electron beam through hole formed therein. The method of claim 9, The electron gun for the color cathode ray tube, characterized in that the first and second electrode members are formed to be inclined so as to focus the electron beam toward the center electron beam side. The method of claim 10, The first and second inner electrode pieces are inclined so as to concentrate the electron beam toward the center electron beam side. The method of claim 8, Electron gun for color cathode ray tube, characterized in that the voltage applied to the final acceleration electrode is applied to the electric field expansion electrode, the voltage reduced by the resistor is grounded. The method of claim 13, A constant voltage is applied to the screen electrode and the second focus electrode, a focus voltage higher than the constant voltage is applied to the first and fourth focus electrodes, and a dynamic focus voltage is applied to the third and fourth focus electrodes. An electron gun for color cathode ray tubes. The method of claim 8, Electron gun for color cathode ray tube, characterized in that mounted on the neck portion having a diameter of 21mm to 25mm. First and second focus electrodes having large-diameter electron beam through holes formed on respective corresponding surfaces of the main lens, and field extension electrodes disposed between the first and second focus electrodes, and internal electrode members installed in the first and second focus electrodes and the field extension electrodes; At least one of the two electrode members is installed so as not to contact each other to form three electron beam through-holes, and the voltage of the second focus electrode is applied to the field extension electrode to which the inner conductive film of the cathode ray tube and the coincidence are applied. Electron gun for color cathode ray tube, characterized in that the pressure was reduced by.

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