KR20010081586A - Shadow-Mask for a color picture tube - Google Patents

Abstract

PURPOSE: A shadow mask for use in a color ray tube is provided to improve the color purity of a color cathode ray tube and the productivity thereof by optimizing a slot width of a shadow mask and an angle of a vertical slot. CONSTITUTION: A shadow mask comprises the slot of a circle or an ellipse arranged thereon with a predetermined pattern. A size of a slot width and an angle of a vertical slot are varied according to the position to be arranged on the shadow mask. A corner slot of the shadow mask is getting smaller with a constant ratio to the outside. The major axis of a slot around each corner of the shadow mask is slantingly formed to the diagonal line passing the respective corner. The slanting angle of the slot is increased from the center of the shadow mask to the corner thereof.

Description

Shadow Mask for Color Cathode Ray Tube {Shadow-Mask for a color picture tube}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shadow mask for a color cathode ray tube, and in particular, to improve luminance and color purity margins, the size of slots around a shadow mask corner is reduced in the order of columns and the angle of the vertical slots is reduced. The present invention relates to an optimized shadow mask for color cathode ray tubes.

In general, in the case of color cathode ray tubes for high-definition data processing, one of the factors that most influence quality characteristics is color purity. Therefore, each cathode ray tube manufacturer is actively researching to improve the color purity of the colored cathode ray tube.

1 is a cross-sectional view schematically showing the structure of a general color cathode ray tube.

Referring to FIG. 1, the structure of a general color cathode ray tube includes a front glass called a panel 101 and a rear glass called a funnel 102, in which a fluorescent screen 104 and a fluorescent screen serve as predetermined light emission. The electron gun 110, which is the source of the electron beam 106 that emits light 104, and the shadow mask 103, which selects colors to emit light of a predetermined phosphor, the frame 107 and the electron beam 106 supporting it, are vertically And a deflection yoke 105 for deflecting the deflection path.

In addition, a spring 108 for allowing the frame 107 to be coupled to the panel and an inner shield 109 for allowing the cathode ray tube to be less affected by external geomagnetism during operation are coupled to the frame 107 to be sealed with high vacuum. It is.

Referring to the operation of the color cathode ray tube as described above, the electron beam 106 is formed on the inner surface of the panel 101 by the anode voltage applied to the color cathode ray tube in the electron gun 112 embedded in the neck of the funnel 102. When hitting the fluorescent surface 104, the electron beam 106 is deflected up and down, left and right by the deflection yoke 105 before reaching the fluorescent surface 104 to form a screen.

In addition, there is a 2, 4, 6-pole magnet 110 that corrects the traveling trajectory so that the electron beam 106 strikes a predetermined phosphor, thereby preventing poor color purity.

FIG. 2 is a view showing the size of a conventional shadow mask small diameter slot for color cathode ray tube, and FIG. 3 is a view showing a vertical slot angle of the small pore diameter before and after pressing a conventional shadow mask for color cathode ray tube.

2 and 3, the shadow mask of the cathode ray tube for data processing and image has a slot 201 having an electron beam passing hole in a circular shape or an ellipse shape, and the slot mask Sh in the horizontal direction of the shadow mask. The slot diameters Sv in the vertical direction are arranged at a constant magnification.

In particular, the shadow mask for the conventional color cathode ray tube is manufactured in the horizontal slot size and the vertical slot size of the outermost corner of the corner portion 1 ~ 10 columns the same as the slot size of 10 rows or more.

However, when the shadow mask for the conventional color cathode ray tube is arranged in the slot size as described above, the slots of the outermost corners of the shadow mask corners in the shadow mask frame are expanded by about 20 to 0% by about 20 to 0% when the shadow mask frame is operated. Significantly reduced, the gap between the phosphors (R, G, B) coated on the inner surface of the panel is narrowed, and the electron beam passing through the shadow mask is enlarged, resulting in a decrease in color purity.

In addition, if the angle of the vertical slot of the shadow mask is manufactured vertically (90 degrees), after pressing, the slant is inclined by about 0.5 to 50 degrees depending on the arrangement of the slots, so that the interval between the shadow mask slots in the diagonal direction becomes narrower, thereby resulting in color purity. There is a problem that degradation occurs.

In addition, the problem as described above is intensified in accordance with the trend of the larger size of the color cathode ray tube.

The present invention was created in order to solve the above problems, and configured to change the angle of the shadow mask slot diameter (Slot Width) and the vertical slot (Sv) for the color cathode ray tube for each position of the slot to appear at the corner of the screen. It is an object of the present invention to provide a shadow mask for color cathode ray tubes that can solve poor color purity.

1 is a cross-sectional view showing the structure of a general color cathode ray tube.

Figure 2 shows the shadow mask small pore slot size for a conventional color cathode ray tube.

Figure 3 shows the vertical slot angle before and after the shadow mask press for a conventional color cathode ray tube.

Figure 4 schematically shows the shadow mask small diameter slot size for color cathode ray tube of the present invention.

Figure 5 shows the vertical slot angle before and after the shadow mask press for color cathode ray tube of the present invention.

FIG. 6 shows the relationship between the number of shadow mask corner slots for color cathode ray tubes and the magnification after press; FIG.

7 is a view showing a change in the slope of the vertical slot according to the slot arrangement after the frame of the shadow mask.

FIG. 8 is a diagram to show the number of slot columns of a shadow mask when the vertical slot angle is tilted. FIG.

<Explanation of symbols for the main parts of the drawings>

101 ... Panel 102 ... Funnel

103 ... shadow mask 104 ... fluorescent surface

105 ... deflection yoke 106 ... electron beam

107 ... frame 108 ... spring

109 ... inner shield 110 ... magnet

111 ... reinforcement band 112 ... electron gun

201 ... Slot

The shadow mask for color cathode ray tube of the present invention for achieving the above object is a shadow mask for color cathode ray tube which is press-processed to a predetermined curvature shape with a slot or an elliptical slot arranged in a predetermined pattern. The method may include arranging the size of the slot diameter of the shadow mask and the angle of the vertical slot for each position.

Preferably, the corner portion of the shadow mask for color cathode ray tube is characterized in that the ball is reduced by a certain ratio than the size of the slot diameter initially designed in the outermost order.

More preferably, the long axis of the slot near each corner portion of the shadow mask is formed to be inclined in a diagonal direction through the corners.

4 is a view showing the arrangement of the shadow mask for the color cathode ray tube shadow mask of the present invention, which shows the arrangement of the slot, Figure 5 shows the angle and pore size of the vertical slot before and after pressing of the shadow mask for color cathode ray tube of the present invention. Figure showing.

Referring to FIG. 5, the first, second, and tenth columns of the shadow mask are arranged in the order of the outermost slots of the shadow mask, and the size of the horizontal and vertical slot diameters of the desired first row after pressing is set to Sh1, Sv1, The size of the horizontal and vertical slot diameters in the second row is Sh2, Sv2 .... The size of the horizontal and vertical slot diameters in the tenth row is Sh10 and Sv10, and the sizes of the horizontal and vertical slot diameters in the first row before the press are Sh1 ', Sv1', If the sizes of the second row horizontal and vertical slot diameters are Sh2 ', Sv2', ..., and the tenth row horizontal and vertical slot diameters are Sh10 'and Sv10', in the present invention, the horizontal and vertical slots before and after pressing are The formula related to the size of the diameter can be expressed as

Sh1 '= Sh1 * (0.80 to 1.00), Sv1' = Sv1 * (0.80 to 1.00)

Sh2 '= Sh2 * (0.82 to 1.00), Sv2' = Sv2 * (0.82 to 1.00)

Sh3 '= Sh3 * (0.84 to 1.00), Sv3' = Sv3 * (0.84 to 1.00)

Sh4 '= Sh4 * (0.86 to 1.00), Sv4' = Sv4 * (0.86 to 1.00)

Sh5 '= Sh5 * (0.88 to 1.00), Sv5' = Sv5 * (0.88 to 1.00)

Sh6 '= Sh6 * (0.90 to 1.00), Sv6' = Sv6 * (0.90 to 1.00)

Sh7 '= Sh7 * (0.92 to 1.00), Sv7' = Sv7 * (0.92 to 1.00)

Sh8 '= Sh8 * (0.94 to 1.00), Sv8' = Sv8 * (0.94 to 1.00)

Sh9 '= Sh9 * (0.96 ~ 1.00), Sv9' = Sv9 * (0.96 ~ 1.00)

Sh10 '= Sh10 * (0.98 ~ 1.00), Sv10' = Sv10 * (0.98 ~ 1.00)

As shown in Equation 1 above, when the outer diameter of the outermost column 1 to the 10th column is sequentially made small by about 20 to 0% according to the arrangement order of the slot diameters, the slot diameter is increased by the press after pressing, so the ideal size of the slot diameter is achieved. Becomes

In addition, when pressing the shadow mask for the color cathode ray tube as shown in Figure 5, the shadow mask vertical slot is inclined, when pressing the vertical slot of the shadow mask corner portion at an angle of 0.5 to 50 degrees in the direction opposite to the tilt direction Tilted shadow masks can be used to improve corner color purity in color cathode ray tubes.

Here, the cause of the inclination of the vertical slot of the shadow mask is caused by the fact that the tensile modulus of the shadow mask is partially different due to the shadow mask corner notch during the press operation.

Therefore, the angle at which the shadow mask vertical slot is inclined is such that the angle of the outermost column increases in the vertical and horizontal directions with the portion close to the corner notch.

FIG. 6 shows the relationship between the number of shadow mask corner slots for color cathode ray tubes and the magnification after press.

Referring to FIG. 6, it can be seen that the larger the size of the shadow mask, the larger the enlargement amount of the shadow mask outermost column slot.

7 is a view showing a change in the slope of the vertical slot according to the slot arrangement after the frame of the shadow mask, Figure 8 is a view for showing the arrangement of the slots of the shadow mask for the shadow cathode ray tube of the present invention.

As shown in FIG. 8, the columns of the shadow mask are classified into one column, two columns,..., And ten columns from the outermost column.

As described above, according to the shadow mask for color cathode ray tube of the present invention, the color diameter of the color cathode ray tube can be improved and productivity can be improved by optimizing the size of the slot diameter and the angle of the vertical slot of the corner portion of the shadow mask. There is.

Claims (7)

In the shadow mask for color cathode ray tube which is press-processed to a predetermined curvature shape with the slot of the circle or ellipse shape arrange | positioned in a predetermined pattern, The shadow mask for color cathode ray tube, characterized in that for arranging the size of the slot diameter of the slot constituting the shadow mask and the angle of the vertical slot for each position. The method of claim 1, Corner slot of the shadow mask mask for color cathode ray tube shadow mask for color cathode ray tube, characterized in that to form a slot by shrinking a predetermined ratio than the size of the first designed slot diameter in the outermost order. The method of claim 1, The shadow mask for a color cathode ray tube, wherein the long axis of the slot in the vicinity of each corner of the shadow mask is inclined in a diagonal direction through the corners. The method of claim 1, The inclination angle of the long axis of the slot constituting the shadow mask with respect to the vertical direction of the screen is a shadow mask for color cathode ray tube, characterized in that the inclination angle of the long axis increases from the center to the corner portion. The method of claim 4, wherein The range of the inclination angle is a shadow mask for color cathode ray tube, characterized in that about 0.5 to 50 degrees. The method of claim 1, The shadow mask slot of the shadow mask is characterized in that the inclined angle in the opposite direction by the same amount as the inclination angle in the pressing process. The method of claim 1, Ball of the shadow mask shadow mask for a cathode ray tube, characterized in that to reduce the size in consideration of being enlarged in the pressing process.