JPS58157039A - Shadow mask type color cathode-ray tube - Google Patents

Abstract

PURPOSE:To make it possible to minimize the change of hole pitches together with the realization of the complete correction of a tilt phenomenon by gradually reducing a vertical pitch from the Y axis toward the X direction and increasing a horizontal pitch from the X axis toward the Y direction. CONSTITUTION:Horizontally arranged lines and vertically arranged lines are respectively barrel-shaped and pin-cushioned. A means for that is provided as described below. The vertical pitch Py of holes on the vertically arranged lines is gradually reduced as it goes away from a pitch Pyo on the Y axis toward the X direction, and a vertical pitch on the m-th row of the vertically arranged lines is made a constant Pym. Further, the horizontal pitch Px of holes on the horizontally arranged lines is gradually increased as it goes away from a pitch Pxo on the X axis toward the Y direction, and a horizontal pitch of the n-th row of the horizontally arranged lines is made a constant Pxn. Hereby, it is possible to restrict the change of the pitches within a practical region and completely correct a tilt phenomenon.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shadow mask type color cathode ray tube, and more particularly to a high resolution color cathode ray tube used for terminals such as computers.

As is conventionally known, in shadow mask type color cathode ray tubes, shadow masks are roughly divided into round hole type and rectangular hole type, and electron guns are roughly divided into delta type and inline type. Regarding color cathode ray tubes, the majority of shadow masks were of the round hole type, and the electron guns were of the delta type. However, in color cathode ray tubes for ultra-high resolution, in-line type electron guns are increasingly being used in order to simplify V4 adjustment (hereinafter this system will be referred to as the dot-in-line type).

However, the dot inline type color cathode mentioned above,
- The tube has fatal defects as described below.

In Figure 1, an electron gun or an in-line array of electron beams is arranged in a direction that corresponds to the manual direction of the fluorescent screen (1), and the beams for red, green, and red are respectively BB%.
BG and BR. As shown in the figure, the direction of the inline arrangement is the X axis, and the direction including the center of the fluorescent screen (1) and perpendicular to the X axis is the Y axis. The person in Figure 1 shows a partially enlarged view of the hole arrangement of the shadow mask corresponding to the fluorescent screen (1).

The round holes of the shadow mask are arranged at an appropriate pitch P in the Y-axis direction, and the distance from the - column is 4 pitches, and the phase is shifted by 1/2P from the - column. Here, place the fluorescent screen (1
) usually adopts a glass panel, and is formed in a spherical shape to prevent implosion due to the fact that the envelope is a vacuum container.The shadow mask facing the fluorescent screen (1) is also formed in a spherical shape. It is normal to do so.

In a cuff-cathode ray tube with such a configuration.

Due to its geometrical characteristics, the three-color electron beam trio at the corner of the fluorescent screen is x as shown in Figure 2.
[A phenomenon that tilts toward 11ilI (chill) occurs. The inconvenience caused by this tilt phenomenon will be further explained.

FIG. 8 is a diagram showing the arrangement of the electron beam trio in the upper right corner of the fluorescent screen. G1-G4 is the projection of the center beam corresponding to the mask hole, Bl-B4, R1-R
4 represents the side beam projection. As is clear from Fig. 1, the electron beam arrangement of G1-G4 almost corresponds to the hole arrangement of the shadow mask, so %G1-G2 is parallel to the X-axis and 68 to G4 is almost parallel to the Y-axis. However,
Because the side electron beams are tilted, the uniformity of the spacing between each electron beam is lost, for example, R1-88, R4-B2.
The problem arises that the spacing between the electron beams becomes very narrow, as shown in the relationship . Originally, the most efficient design can be achieved when the electron beam spacing on a fluorescent screen is arranged in the same way, but if there is an imbalance like this, the spacing between the electron beams at the narrowest point Since the design must be made based on , for example, when considering the size of the electron beam, it is inconvenient that the most efficient size cannot be selected.

Now, in order to improve the inconvenience of this dot in-line type, the holes of the shadow mask are arranged in a "barrel" shape in the horizontal direction and in a "bottle cushion" shape in the vertical direction, as in the invention of Japanese Patent Publication No. 1@50-21214. Although methods to do this have been proposed, the reality is that they have not been put into practical use. The following reasons can be considered for why this technology has not been put into practical use.

As shown in Japanese Patent Publication No. 5011214, Fig. 4 shows the horizontal arrangement lines in the shape of an "er" and the vertical arrangement lines in the shape of a "bottle cushion."
For rounding, the vertical pitch ry in m columns of vertical array lines is ry(m, n) from Py(m, 1).
) t, and in order to make the nine vertically arranged lines into a "bottle cushion" shape, the horizontal pitch Pi in the n rows of horizontally arranged lines is smaller than Px(1,m) by Pi(m).
, n). The change in each pitch is, for example, Py(m%n)-ry(ms n)・(1-αnsuPi
(m,n)xPx(1,n)・(l×βm2)However,
Appropriate positive coefficients are appropriate for α and β.

Although it is theoretically possible to correct the above-mentioned disadvantages of the dot-in-line type, that is, the tilt phenomenon, by configuring the hole arrangement as described above,
Correction using this method requires that the pitch at the periphery be changed by a small amount compared to the pitch at the center, so it is not practical, especially for products such as high-resolution color TM pole-ray tubes, where the absolute value of pitch is originally small. For example, the inclination angle θ of the eight-color electron beam trio at the peripheral corner at a 14' size is about 6 degrees.

To compensate for a tilt of about 6 degrees, use a vertical pinch PY
If P y (ms 1) is SOOμ, the peripheral pitch Py (msn) needs to be about 270μ, and even though the tilt phenomenon is corrected and the beam spacing is well-balanced, The problem with this is that it doesn't get much better than 9 in terms of absolute value, starting from 6 9.

The present invention has been made to eliminate the above-mentioned drawbacks, and an object of the present invention is to provide a shadow mask type color anode ray tube which can minimize the amount of change in hole pitch and can completely correct the chill phenomenon. There is.

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 6 shows the hole arrangement of the shadow mask according to the embodiment of the present invention in the first quadrant 'iAK. As is clear from FIG. The “bottle cushion” shape was created in the 5th century
This is similar to No. 011214, but as a means for this purpose, the vertical pitch P7 of the holes O in the vertical arrangement line is gradually made smaller as the distance from the pitch Pyo on the Y axis increases in the X direction, and the vertical pitch P7 in the m rows of the vertical arrangement line is is Pym
'I)J), and the horizontal pitch Px of the holes in the horizontal alignment line gradually increases as it moves away from the pitch Pxo on the X axis in the Y direction, and the horizontal pitch in n rows of the horizontal alignment line is A special feature is that it is constant at Pxn. With such a configuration, the degree of tilt correction around the corner is determined by the accumulation of pitches, and the amount of change in pitch can be small. Incidentally, in size 14, the pitch P of the shadow mask is 800 μm and uniform (D4h, so the inclination of the electron beam trio at the upper corner of the fluorescent screen is about 6 degrees, and R1-B Hata, which has the smallest electron beam interval, R4-B! is about 155μ, but the vertical pitch is Py・sOOμ, Pym
By setting the angle to 285μ, a good beam alignment was obtained by correcting the inclination of about 6 degrees, and this and the turtle's R1-B5°R4-B
If the distance between the two is 180μ, an effect of approximately 2bμ can be achieved.9. In a device such as a high-resolution color cathode ray tube in which the absolute value of the pitch itself is small, this value of 25 μ is extremely large. 4. Of course, with such a configuration, the pitch near the X-axis and the Y-axis will also change, but the effect of improving the tilt phenomenon at the corner is enough to compensate for this. be.

As stated above, according to the present invention, the vertical pitch of the holes in each vertical array line is constant,
The vertical pitch gradually decreases as it moves away from the Y axis in the X direction, and the horizontal pitch in each horizontal array line is constant, and the horizontal pitch decreases as it moves away from the X axis in the Y direction. By gradually increasing the pitch, it is possible to keep the change in pitch within a practical range and to completely correct the tilt phenomenon.

In addition, the hole arrangement of the shadow mask disclosed in Japanese Patent Publication No. 1i860-21214 has only a constant pitch on the X and Y axes, and the pitches elsewhere are all different. The curved surface of the mask would also be very complicated, but in this invention, the hole pitch on each array line is constant, making it easy to manufacture the shadow mask.The curved surface of the shadow mask is also centrally determined, so it is possible to It will not be a curved surface.

[Brief explanation of the drawing]

Figure 1 is a diagram explaining the relationship between the in-line array of the electron gun and the hole array of the shadow mask, Figure 2 is a diagram showing the tilting of the electron beam trio on the fluorescent screen, and Figure 8 is a diagram explaining the relationship between the in-line array of the electron gun and the hole array of the shadow mask. FIG. 4 is a diagram showing the hole arrangement of a conventional shadow mask, and FIG. 5 is a diagram showing the hole arrangement of a shadow mask according to an embodiment of the present invention. be. (1)... Fluorescent screen, Py., Pym... Vertical pitch, Pxo%Pxn... Horizontal pitch, X, Y... Coordinate axes. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent Makoto Kuzuno (1 other person) Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] (1) A nine-shadow mask type color cathode ray tube comprising a nine-shadow screen in which a large number of holes are arranged at an appropriate pitch, and an in-line type electron gun disposed opposite to the shadow mask, in which the electron gun is arranged in an in-fin arrangement. The direction of
When the Y-axis is a direction perpendicular to the X-axis and includes substantially the center of the fluorescent screen, the vertical pitch of the holes in each vertical alignment line substantially parallel to the Y-axis is substantially constant, and The vertical pitch gradually decreases as it moves away from the Y-axis in the X direction, and the horizontal pitch of the holes in each horizontal array line substantially parallel to the X-axis is substantially constant and A shadow mask type color cathode ray tube whose directional pitch gradually increases as it moves away from the X axis in the Y direction.