KR880003497Y1 - Shadow masks for colour-television tubes - Google Patents

Abstract

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Description

TV collar awards shadow mask

1 is a front view showing the shape of a shadow mask.

FIG. 2 is a partially enlarged view showing the hole in the conventional shadow mask through the dotted line portion "1" of FIG.

3 is an explanatory diagram showing the relationship between a black matrix, a phosphor, a shadow mask, and an electron beam in a water tube.

4 is an explanatory diagram showing that the black matrix is restricted to light emission of a phosphor by an electron beam.

5 is an explanatory diagram showing that there are two types of screens in a stripe-shaped water tube.

6 is an explanatory diagram showing that when the electron beam is aligned with the red, blue, and green phosphors, the rust and blue match well, but the red electron beam is contained.

7 is an explanatory diagram showing the difference in light emitting area due to a distorted electron beam.

8 is an enlarged view showing another example of a conventional shadow mask having different types of holes.

9 (a) and 9 (b) are plan views showing the shape of holes in another example of the conventional shadow mask.

10 (a) to 10 (d) are explanatory views showing various examples of marking the central portion of the hole of the shadow mask according to the present invention.

11 is an explanatory view showing that the electron beam is completely distorted.

Figure 12 is an explanatory view showing the operation of the shadow mask according to the present invention.

* Explanation of symbols for main parts of the drawings

1: shadow mask 2 ": hall

7: groove 8: protrusion

The present invention relates to a shadow mask of a television color receiving tube. In particular, an improvement in which the screen of the color receiving tube can be easily adjusted by forming grooves and protrusions, which are the central display portions, in a rectangular hall of the shadow mask. To a shadow mask in a modified form.

Conventionally, as shown in FIG. 1, the shadow mask 1 of the television color receiving tube is formed with a rectangular hole 2, and the screen of the receiving tube 6 positioned in front of the shadow mask 1 is provided. The black matrix 3 and the fluorescent substance 4 are apply | coated in stripe form on the inner side surface.

At this time, as shown in FIG. 3, the path of the electron beam 5 and the hole 2 of the shadow mask 1 and the black matrix 3 of the screen 6 should exactly match.

That is, the electron beam 5 reaching the screen 6 through the hole 2 of the shadow mask 1 receives the emitted light of the phosphor 4 only in a limited area by the black matrix 3. Will be diverted out of.

However, due to various reasons during the process, in the finally formed water tube, the battery beam 5 is often not obliquely centered on the black matrix 3 and the phosphor 4 but is obliquely aligned as shown in FIG. 7. .

The electron beam 5 is close to the super ellipse commonly found in stripe-shaped water tubes. "It is normalized by the hole 2 of the shadow mask 1 in the form and is incident on the screen 6 in the same shape, in which case the electron beam 5 does not exactly center the black matrix 3, FIG. As shown in Fig. 6, the emission area is different from the original case, and the relative difference between red, blue, and green appears (see Fig. 6). In this case, the water tube is bad because it appears as a stain and distinguishes it from other parts of the screen, which is called white uniformity, which is one of the important characteristics in the performance evaluation of color water tubes. Also, the shape of the hole 2 of the shadow mask 1 is close to that of a super elliptical shape. "One of the reasons for rounding the upper and lower edges in the form is that the final shape of the beam can be collected when adjusting the deflection coil to finally determine how the electronic load fits the black matrix 3 of the screen 6 so that the scan This is because adjustment work becomes easy.

In order to solve the problem of white uniformity as described above, a shadow mask having a rectangular hole 2 'has been developed as shown in FIGS. 8 and 9.

That is, since the shape of the electron beam 5 passing through the rectangular hole 2 of the shadow mask is also rectangular, the electron beam 5 may not be exactly centered on the black matrix 3 of the screen 6. As shown in FIG. 11, there was an advantage that white uniformity could be maintained unless the black matrix 3 was completely deviated.

However, the shadow mask having the rectangular hole 2 'solves the problem of white uniformity, but since the shape of the hole 2' is rectangular, the center of each hole 2 'could not be observed. Therefore, when the screen adjustment operation is completed while the holes 2 are shifted to the left or the right of the black matrix 3, as shown in FIG. 11, the electron beam 5 is out of the black matrix 3 so that the screen There was a problem that the color purity of (6) was lowered or a nonuniformity of luminance was caused.

Once again, the shortcomings and shortcomings of the conventional shadow mask 1 are summarized. In the case where the holes 2 of the shadow mask 1 have an elliptical shape, screen adjustment is easy and white uniformity can be maintained. There was no difficulty, and in the case of the rectangular shape of the hole 2 'of the shadow mask 1, there was an advantage of maintaining the white uniformity, but it had the opposite advantages and disadvantages that screen adjustment was not easy.

It is therefore an object of the present invention to provide a shadow mask that facilitates the screen adjustment operation while maintaining the white uniformity to solve the above problems.

An object of the present invention having the purpose as described above is achieved by forming a groove or a protrusion indicating the center on the upper or lower edge of the rectangular hole.

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

As shown in FIGS. 1, 3, and 10, the electron beam 5 is coated with the black matrix 3 and the phosphor 4 through the rectangular holes 2 "of the shadow mask 1. In scanning to the screen 6, the groove 7 or the projection 8 which shows the center of the hole 2 "is formed in the upper or lower edge of the said hole 2".

The shadow mask 1 of the present invention has an electron beam passing through the hole 2 ″ of the shadow mask 1 by forming a groove 7 or a protrusion 8 at the upper or lower edge of the hole 2 ″. When the shape of (5) is imaged on the screen 6, as shown in FIG. 12, the groove 7 or the projection 8 of the hole 2 "is shown as it is, so that the center of the electron beam 5 It can be identified, and thus, the electron beam 5 can be prevented from shifting to the left or the right to facilitate the screen adjustment work.

The shadow mask of the present invention as described above can solve the problem of white uniformity and at the same time facilitate the screen adjustment work, and also prevent the color purity degradation or luminance unevenness as in the conventional case, the number of excellent color performance A correlation can be made.

Claims (1)

In a typical shadow mask having a rectangular hole 2 ", a groove 7 or a protrusion 8 is formed at the upper or lower edge of the hole 2 " to indicate the center of the hole 2 " Shadow mask of TV color receiving hall characterized in that it became.