KR830000920B1 - Electrode gun manufacturing method - Google Patents

Abstract

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Description

Electrode gun manufacturing method

1 is a front view and a sectional view of a conventional electrode shape.

2 is a front view of the slit plate shown in FIG.

3 is an electrode front view and a sectional view of a shape in which the electrode shown in FIG. 1 is simply integrated.

4, 5 and 6 are front and cross-sectional views showing first, second and third embodiments of the electrode according to the present invention, respectively.

7 (a), 7 (b) and 7 (c) are front and cross-sectional views showing one embodiment of the electrode manufacturing process according to the present invention.

8 is a front view and a cross-sectional view showing an embodiment in which the electrode according to the present invention is applied to an inline electrode.

The present invention relates to a method for producing an electrode of an electron gun for color brown tubes.

In color-brown tubes, such as in-line color-brown tubes, self-convergence causes pincushion electron beams and barrel distortions in the deflection field that deflects the electron beam from the electron gun. have. For this reason, the electron beam receives deflection distortion when passing through the deflection magnetic field, and in the peripheral periphery of the fluorescent surface, especially the corner portion, it is accompanied by a horizontal core and a longitudinal halo, and thus the focus on the entire fluorescent surface. It is deteriorating characteristics.

In order to obtain uniformity across the entire fluorescent surface of this focus characteristic, a cross slit shape is used as shown in FIG. 1 for the first grid electrode of the electron gun. As shown in FIG. 2, the first grid electrode 2 is orthogonal to the two sheets 2 and 3 that form the rectangular slits 2a and 3a, and is shown in FIG. The second grid is formed by welding at the concave contact point to form a non-passing hole 1a at the center, a plate 2 having the transverse elongated slit 2a, and a plate 3 having the elongated elongated slit 3a at the cathode side. It is used after being disposed on the electrode side. This improves the focusability by changing the distribution of the plate thickness in the electron beam direction in the transverse and longitudinal directions.

Considering this concretely, since the traveling distance of the electron beam is different in the center portion and the peripheral portion of the fluorescent screen, and the peripheral portion is longer than the central portion, the focus voltage is higher than the central portion. Therefore, the crossed image when the focus voltage is set in the center part is illuminated on the fluorescent surface, and the peripheral part viewed by this focus voltage is illuminated on the fluorescent surface by the image of several 100 μm cathode side at the intersection. As described above, in the first grid electrode 1 having the cross slit, the plate 2 on which the transverse elongated slit 2a is formed is disposed on the cathode side, and the beam made from this is a transverse beam. It carries halow in the horizontal direction. This corrects the deflection distortion around the fluorescent surface. However, the resolution deteriorates because the beam in the center portion is also crossed. This transverse long beam is corrected by the plate 3 having the longitudinal elongated slits 3a disposed on the second grid electrode side.

From this point of view, by appropriately selecting the arrangement of the horizontal long slit 2a on the cathode side and the vertical long slit 3a on the second electrode side, the beam shape of the center portion and the peripheral portion can be adjusted. That is, the beam has a long horizontal beam on the cathode side, and the beam having a long vertical beam on the second grid electrode side, the middle of which becomes a round electron beam generally under the influence of the space charge of electrons. The focus voltage may be adjusted to have a round electron beam spot shape at the center of the screen.

Here, since the cross-slit first grid electrode 1 having such a feature is formed by welding two sheets 20 (3) as described above, the production cost is high, and deformation, simmering error, etc. due to welding are increased. This is a disadvantage in that the blocking characteristics and the focus characteristics deteriorate, especially in the case of electrodes in which the three electrodes of green (G), blue (B), and red (R) are integrated, it is difficult to weld two sheets in close contact. There is a tendency for gaps between the plates, and the thickness of the slit plate is in a changed state, whereby the above characteristics are significantly deteriorated.

Thus, the inventors of the present invention have conducted various studies and experiments on the electrode shape by one sheet and its manufacture in order to eliminate the defects caused by welding the two slit plates (2) and (3). However, as long as the electrode 4 of the shape shown in FIG. 1 is simply made into an integrated electrode 4 as shown in FIG. This is difficult and not mass-produced. That is, when the electrode 4 shown in FIG. 3 is pressed by a press, the upper surface of the lower frame having the shape of the horizontal long slit 4a and the lower surface of the upper frame having the shape of the vertical long slit 4b. Since the slit bottoms 4c collide with each other, the mold is destroyed by the impact. Moreover, it is impossible to manufacture so that the cross section of both frames may fully match in the slit bottom surface 4c.

The present invention has been made in view of the above background, and an object of the present invention is to provide a method for producing an electrode for an electron gun for color-brown tubes, which can mass-produce an integral electrode for improving characteristics.

EMBODIMENT OF THE INVENTION Hereinafter, the Example which showed this invention is demonstrated. 4, 5 and 6 show the first, second and third embodiments of the electrode according to the present invention, respectively. As shown in the figure, the slit bottoms 5b, 6b and 7b of the longitudinal slits 5a, 6a and 7a of the electrodes 5, 6 and 7 and the longitudinal slits respectively. The slits bottom surfaces 5d, 6d, and 7d of (5c), 6c, and 7c are formed with a slight gap 5e, 6e, and 7e, and both slits 5a and 5c. A rectangular non-passing hole having a length approximately equal to or shorter than the short side of the slit 5a, 6a, 7a at the intersection of (6a) (6c) and (7a) (7c) 5f) (6f) 7f are newly established.

In this way, the upper and lower frames are pressed by keeping the distances 5e, 6e, and 7e from one slit bottom face 5b, 6b, 7b and the other slit bottom face 5d, 6d, 7d. It does not hit and destroy, and can be easily produced in mass production. After this stamping, the electrodes 5, 6 and 7 are obtained by punching the non-passing holes 5f, 6f and 7f with a press.

In FIG. 5, the horizontal long slit 6a and the vertical long slit 6c are formed in the same width. In FIG. 4, the vertical long slit 5c is wider than the horizontal long slit 5a. It is. In this way, when the longitudinal long slit 5c is formed wide, the lower frame of the longitudinal long slit 5c shaft can receive the punched portion 5d in the same plane when the non-passing hole 5f is punched. Higher precision machining can be performed.

Moreover, when taper is formed in the inner periphery of the slit 7a, 7c like FIG. 6, the flaw etc. of the outer periphery of a frame | tip end are prevented, and the life of a rolling jig improves further.

Next, the characteristics of the electrodes 5, 6 and 7 in the shapes shown in FIGS. 4, 5 and 6 will be discussed. The influence of the slit width of the cathode shaft and the second grid electrode shaft, the thickness (length) of the slit, and the like on the beam spot shape or the breaking voltage on the shape of the cross slit electrode was investigated. As a result, various couplings are obtained in the blocking and focusing characteristics, but the slit width and the thickness of the slit of the cathode shaft are significantly limited by the influence on the blocking. However, it has turned out that there is a fish oil design by design in the second grid axis. For example, if the width of the longitudinal long slits 5c, 6c, and 7c in the second grid electrode axis is made smaller, the thickness can also be made smaller. In addition, even if there are gaps 5e, 6e, and 7e between the horizontal long slits 5a, 6a, and 7a and the vertical long slits 5c, 6c, and 7c, the vertical longs of the second grid electrode axis By increasing the thickness of the slits 5c, 6c, and 7c, it has been found that it is possible to adjust the electron beam shape from the horizontal beam to the vertical beam before and after the intersection point.

Thus, it turns out that the electrode 5, 6, 7 of the shape shown in FIG. 4, FIG. 5, and FIG. 6 does not have a problem in some characteristic. For example, with respect to the shape shown in Fig. 4, the width of the long slit 5a is 0.7 mm x 2 mm, the thickness is 0.09 mm, the length of the long slit 5c is 1 mm x 2 mm, the thickness is 0.10 to 012 mm, and the interval ( Experiments were performed with a thickness of 0.03 mm of 5e) and a dimension of 0.67 mm square of the non-passing through hole 5f, whereby good results were obtained.

Next, as an example, the manufacturing method of the electrode 5 shown in FIG. 4 is demonstrated by FIG. As shown in the drawing (a), a lower hole punching about 0.6 mm ψ is performed on a plate about 0.33 mm thick. Next, as shown in the drawing (b), the lower frame having the shape of the horizontal long slit 5a and the upper frame having the shape of the longitudinal long slit 5c are simultaneously pressed and left horizontally with a gap 5e. The long slit 5a and the vertical long slit 5c are formed.

Next, as shown in the same drawing (c), the slit bottom surface 5b of the long slits 5a is received as the lower frame, and the beam is finished by performing the finishing drilling process with the upper frame having the dimension of the non-passing through hole 5f. A through hole 5f is formed. Finally, the electrode 5 is obtained by punching out the outer shape in a desired shape. An example of the in-line first grid electrode 5 in which the three electrodes G, B, and R thus obtained are integrated is shown in FIG.

Moreover, in the said practical example, although the case where the square hole was formed as the non-passing hole 5f, 6f, 7f was demonstrated, it may be a round hole. In the case of this round hole, there is a difference between the square hole and the above-described correction effect. Therefore, it is necessary to consider this in design.

As apparent from the above description, according to the electrode manufacturing method of the electron gun according to the present invention, since the cross slit electrode is integrally formed by one component, the number of components can be reduced and welding assembly is not required. It can be mass-produced and the production cost can be reduced. In addition, since there are no problems such as deterioration of characteristics due to overlapping two sheets, deformation due to welding, deterioration of precision, and the like, an electrode having a certain quality excellent in characteristics is obtained.

Claims (1)

In an electrode of an electron gun having transverse long slits and longitudinal long slits orthogonal to each other and having a non-passing hole at the center of the intersection, the slits bottom surfaces 5b and 6b of the long slits 5a, 6a and 7a intersect with one sheet. (7b) and the longitudinal slits 5c, 6c, 7c, the bottom faces 5d, 6d, 7d of the longitudinal slits and the longitudinal slits are vertically spaced by a pressing process so that they have a predetermined distance (5e, 6e, 7e). The electrode of the electron gun is formed so that the long slit is formed orthogonal to both sides of the sheet material, and then the non-passing holes 5f, 6f and 7f are formed at the center by the intersection of the horizontal long slit and the vertical long slit. Way.

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