KR940000600Y1 - Electron gun - Google Patents

Abstract

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Description

Electron gun for color cathode ray tube

1 is a cross-sectional view of a conventional electron barrel.

FIG. 2 is a plan view showing the connection electrode cap of FIG.

3 is a perspective view of a connecting electrode constituting the electron barrel of the present invention, (a) is a perspective view of a track-type focusing electrode part, (b) is a perspective view of a connecting electrode sheet, (c) is an assembly of (a), (b) State perspective view.

4 is another perspective view of the focusing electrode plate.

* Explanation of symbols for main parts of the drawings

10: track type focusing electrode portion 11,11`: upper and lower focusing electrode plate

12: partition electrode 11R, 11G, 11B for U-shape electric field formation

The present invention relates to an inline type electron barrel for color cathode ray tube, and more particularly to an electron gun sphere for color cathode ray tube which can improve the focus characteristic by making the main lens electrode large diameter.

In the conventional inline type electron barrel for color cathode ray tube, as shown in FIG. 1, the cathode 1, the control electrode 2 and the acceleration electrode 3 form a triode, and the tripole is an electrode for forming a main lens. A bipotential inline electron gun is formed together with the connecting electrode 4 and the final accelerating electrode 5. In addition, the electron beam through holes 4R, 4G, 4B, and 5R, 5G, 5B arranged inline in each of the connecting electrode 4 and the final acceleration electrode 5 are each formed in a circular shape, converging three electron beams. For this purpose, the spacing S ′ between the central axes of the electron beam passing holes of the final acceleration electrode 5 is set slightly larger than the spacing S between the central axes of the electron beam passing holes of the focusing electrode 4. In addition, the focusing electrode 4 includes a focusing electrode bottom 4a facing the acceleration electrode 3 and a focusing electrode cap 4b facing the final accelerating electrode 5, and the focusing electrode cap 4b. Is configured as shown in FIG.

In addition, the final accelerating electrode 5 facing the focusing electrode cap 4b is similar in configuration to the focusing electrode cap 4b shown in FIG.

Table 1 below shows the position number of each portion of the focusing electrode cap 4b shown in FIG. 2 and the position number of the final acceleration electrode 5 corresponding to the respective portions in the conventional electron gun for inline type color cathode ray tube.

TABLE 1

However, in general, the focus characteristics are the diameters DR, DG, and DB of the electron beam passing holes 4R, 4G, and 4B of the focusing electrode cap 4b forming the main lens, and the electron beam passing holes of the final acceleration electrode 5 ( 5R, 5G, 5B) are affected by the diameter (DR, DG, DB) size. Therefore, in order to obtain good focus characteristics, the diameters DR, DG, DB, and DR, DG, DB of the electron beam passing holes 4R, 4G, 4B (5R, 5G, 5B) should be as large as possible.

However, in the in-line electron gun, the diameters DR, DG, DB, and DR ', DG', and DB 'of each of the electron beam passing holes 4R, 4G, 4B (5R, 5G, 5B) are increased. Electron Beam Passing Holes (4R, 4G, 4B) By widening the spacing (S, S 'only) between 5R, 5G, 5B) and its central axis, converging three electron beams on a phosphor-coated screen (not shown) In addition to the difficulty, the focusing electrode 4 and the final accelerating electrode 5 become large and close to the inner diameter of the neck portion of the glass valve, so that a high voltage discharge occurs at the neck portion. There was a drawback that the drift of the focus characteristics appeared, making it impossible to use in practice.

In order to solve the above-mentioned drawbacks, the present invention devised to improve the focus characteristic by large diameter of each electron beam passing hole without increasing the focusing electrode and the final acceleration electrode, which will be described in detail with reference to the accompanying drawings. Is as follows.

3 is a perspective view of a focusing electrode constituting the electron gun body of the present invention. First, as shown in (a), a partial arc 10b is formed in the side wall portion 10a of the track-type focusing electrode part 10. In addition, upper and lower projections 10c and 10c 'are formed at the front end thereof, and a U-shaped partition electrode 12 for forming a U-shaped field is formed inside the track-type focusing electrode part 10. ), And fix it with a predetermined length Z from 10c '.

Meanwhile, as shown in FIG. 3 (b), the upper and lower electrode plate members 11 and (with the baring portions 11b and 11b formed to have a predetermined thickness Z for forming the electron beam through holes 11R, 11G, and 11B) ( 11 'and 11'c are respectively formed at the front end of the top end 11'), and the upper and lower protrusions 11c and 11c 'of the lower focusing electrode plate member 11 and 11' are respectively formed. Corresponding to the upper and lower protrusions 10c, 10c 'of the track-type focusing electrode unit 10 or fixedly attached by resistance welding, etc., as shown in (c) of FIG. 3, electron beam passing holes 11R, 11G. ), And a focusing electrode having 11B. On the other hand, in Fig. 3, the dimensions of each part are given as W ″ = 21.95 mm, H ″ = 9.7 mm, Z = 1.2 mm ㅿ h = 2.5 mm, and the diameters of the electron beam passing holes 11R, 11G, and 11B are indicated. (Not shown) is given as 8.8 mm, and the spacing (not shown) between the central axes of the electron beam passing holes 11R, 11G, and 11B is 6.6 mm.

In addition, although the final acceleration electrode facing the focusing electrode is not shown, the size may be the same as the focusing electrode of FIG. For example, when the longest diameter of both electron beam through holes 11R and 11B of the focusing electrode is given as 8.8 mm, the diameter of both electron beam through holes of the final acceleration electrode may be set to 9.2 mm. Here, the electron beam passing holes on both sides of the final acceleration electrode are set larger than the electron beam passing holes 11R and 11G on both sides of the focusing electrode in order to converge three electron beams on a screen coated with a phosphor (not shown).

Meanwhile, the upper and lower focusing electrode plate members 11 and 11 'described with reference to FIG. 3 (b) are formed with protrusions 11c and 11c' at their front end portions, but the upper and lower focusing electrode plate members are formed. You may comprise (11c) and (11 ') itself with the same height as shown in FIG.

Referring to the effects of the present invention configured in this way in detail as follows.

The electron beam passing hole 11G of the middle-aged child is obtained by the electric field forming Kanman 12 so that the electrostatic lens close to the source is obtained, and the electron beam passing through the electron beam passing hole 11G is also obtained as the beam spot close to the source. In addition, since the electron beam passing holes 11R and 11B on both sides are also made circular by the electrostatic lens by the circular arc 10b formed on the side wall portion 10a and the upper and lower protrusions 10c and 10c '. The electron beam passing through the electron beam passing holes 11R and 11B is also close to the epicenter.

For example, when the longest diameter of each electron beam through hole 11R, 11G, 11B is 8.8 mm without forming the projections 10c, 10c ', 11c, 11c' in FIG. The narrowest width K from the upper and lower focusing electrode plate members 11 and 11 'to each of the electron beam passing holes 11R, 11G, and 11B is about 0.4 mm, and the electron beam passing holes 11R, 11G, When the longest diameter of 11B) is enlarged more than 8.8 mm, the width K becomes narrower. In this case, the edge effect of the electric field occurs due to the high voltage difference between the final acceleration electrode and the focusing electrode. Distortion occurs in the electron beam shape such that a lens cannot be obtained.

However, in the present invention, since the projections 10c, 10c ', and 11c and 11c' of about 2.5 mm are formed in the track-type focusing electrode part 10 and the upper and lower focusing electrode plate members 11 and 11 ', By eliminating the edge effect of the electric field, a stable electrostatic lag can be obtained and a beam spot having good focusing characteristics can be obtained.

On the other hand, in the above description, the case where the electron beam passing hole has a distance of 6.6 mm between the central axes has been described as an example, but this also applies to the case where the gap between the central axes of the electron beam passing holes is 5.5 mm.

As described in detail above, the present invention does not enlarge the focusing electrode and the final accelerating electrode, so that only the electron beam through hole is large-sized, thereby realizing the large-sized diameter of the main capacitive lens and improving the focus characteristic by using the conventional electrode as it is. There is.

Claims (3)

In-line for color cathode ray tube in which the focusing electrode for generating the main lens and the final accelerating electrode are installed to face each other, and the central electron beam through hole (11G) and the two electron beam through holes (11R, 11B) passing through three electron beams are successively drilled. In the electron gun barrel, an arc 10b is formed on the side wall portion 10a of the track-type focusing electrode portion 10 constituting the focusing electrode, and the upper and lower projections 10c and 10c are formed at the front end thereof. Upper and lower portions 11c and 11c 'are respectively formed on the upper and lower focusing electrode plate members 11 and 11' for forming the electron beam passing holes 11R, 11G and 11B, respectively. The upper and lower protrusions 11c and 11c 'of the upper and lower focusing electrode plate members 11 and 11' are disposed on the upper and lower protrusions 10c and 10 of the track-type focusing electrode unit 10. Electron barrel for a color cathode ray tube, characterized in that fixed to the corresponding 'c). According to claim 1, wherein the upper and lower focusing electrode plate (11, 11 ') has a thickness (Z) of 1.5-2.0mm, the upper, lower focusing electrode plate (11), (11'). Electron barrel for color cathode ray tube, characterized in that the thickness shape of the) is configured to act as a baring. The electron gun barrel for a color cathode ray tube according to claim 1, wherein the upper and lower portions (10c, 10'c, 11c, 11'c) have a height (Δh) of 2-3 mm.