JPH10199437A - Color cathode ray tube with shadow mask - Google Patents

Abstract

(57) Abstract: Provided is a color cathode ray tube including a shadow mask which ensures sufficient mechanical strength of a shadow mask 6 and suppresses occurrence of doming. SOLUTION: A shadow mask hole portion 6A has a large number of slot-like electron beam passage holes 14, and the horizontal hole pitch of each electron beam passage hole 14 is uniform in a fixed area on both sides of a vertical center line 15. A shadow mask 6 which is formed so as to gradually increase gradually from a certain area toward a horizontal end, and gradually decreases gradually from a horizontal center line 16 to a vertical end. ,
The horizontal hole pitch at the center in the vertical direction in the certain area is P _HO , the horizontal hole pitch at the horizontal end corresponding to the center in the vertical direction is P _HX , the horizontal hole pitch at the vertical end in the certain area is P _HY , When the horizontal hole pitch of the corner portion is P _HC , 0.94 · P _HO ≦ P _HY ≦ 0.98 · P _HO , and
It was formed so as to satisfy 1.05 · P _HX ≦ P _HC ≦ 1.15 · P _HX .

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color cathode ray tube having a shadow mask and, more particularly, to a slotted hole of a shadow mask having a number of slot-like electron beam passage holes at variable hole pitches in the horizontal and vertical directions. The present invention relates to a color cathode ray tube having the formed shadow mask.

[0002]

2. Description of the Related Art Conventionally, in a color cathode ray tube provided with a shadow mask, when a large number of slot-like electron beam passage holes are formed in a perforated portion of the shadow mask, a horizontal hole pitch of the large number of electron beam passage holes is required. However, the shadow mask has a variable hole pitch formed so as to be uniform within a certain area on both sides of the vertical center line and to increase gradually from the certain area to the lateral end portion outside the certain area. A color cathode ray tube equipped with a shadow mask (hereinafter referred to as a known first color cathode ray tube)
It has been known.

In a color cathode ray tube provided with a shadow mask, when a large number of slot-shaped electron beam passage holes are formed in the perforated portion of the shadow mask, the horizontal hole pitch of the large number of electron beam passage holes is: A color cathode ray tube provided with a shadow mask having a variable hole pitch formed so as to gradually decrease from the horizontal center line of the shadow mask toward the vertical end thereof (hereinafter referred to as a known second color cathode ray tube) Is also known.

[0004]

By the way, in the first known color cathode ray tube, when a color cathode ray tube having a wide display surface is formed, the total length of the shadow mask in the horizontal direction becomes considerably long. Therefore, it is difficult to secure sufficient mechanical strength of the shadow mask, and when the color cathode ray tube is operated, when any external vibration is applied to the shadow mask, it vibrates in response to the external vibration. Therefore, there is a problem that undesirable doming occurs as a result.

In the second known color cathode ray tube, an approximate expression representing a variable ratio of a horizontal hole pitch of a large number of electron beam passage holes is calculated from the horizontal center line of the shadow mask toward the vertical end. Since the approximation by the quadratic expression of the order of the distance or the following numerical expression is used,
The phenomenon that the curved surface in the vertical end region of the shadow mask becomes unnecessarily small and becomes a negative curved surface in some cases, that is, a so-called reverse warpage occurs in the so-called shadow mask curved surface, and the above-described well-known curved surface is generated. As in the case of the color cathode ray tube, it is not only difficult to secure sufficient mechanical strength of the shadow mask, but also the stripe shape of the fluorescent screen may be curved, and the image is displayed on the display surface of the color cathode ray tube. This causes a problem that an uncomfortable image is generated.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and a main object of the present invention is to provide a color cathode ray tube having a shadow mask provided with sufficient mechanical strength of the shadow mask to suppress the occurrence of doming. Is to provide.

A second object of the present invention is to provide a shadow mask which prevents the warpage of a curved surface of a shadow mask from occurring and reduces the occurrence of a sense of discomfort in an image displayed on a display surface of a color cathode ray tube. A color cathode ray tube provided with:

[0008]

In order to achieve the main object, a color cathode ray tube having a shadow mask according to the present invention is provided with a horizontal hole pitch of a large number of electron beam passage holes formed in a hole portion of a shadow mask. In the horizontal direction of the shadow mask, except for a certain area in the central portion, gradually increase gradually from the central portion to the horizontal end portion, and gradually increase from the central portion to the vertical end portion in the vertical direction of the shadow mask. The horizontal hole pitch in the vertical center in a certain area on both sides of the vertical center line of the shadow mask is P _HO , and the horizontal end pitch corresponding to the vertical center in the certain area is gradually reduced. The horizontal hole pitch is P _HX ,
_Assuming that the horizontal hole pitch at the vertical end in the fixed area is P _HY and the horizontal hole pitch at the corner is P _HC , 0.94 · P _HO ≦ P _HY ≦ 0.98 · The first means is provided so as to satisfy P _HO 1.05 · P _HX ≦ P _HC ≦ 1.15 · P _HX .

According to the first means, in the horizontal hole pitch of a large number of electron beam passage holes, the vertical end hole pitch P _HY in the central fixed area is set to the vertical pitch in the central fixed area. greater than 0.94 times the hole pitch P _HO direction central portion, and formed to be in a range smaller than 0.98 times the same hole pitch P _HO, and the hole pitch P _HC corners,
Greater than 1.05 times the hole pitch P _HX lateral edges corresponding to the longitudinal center portion of the constant region of the central portion, the hole pitch P _HX
Is formed within a range smaller than 1.15 times the shadow mask, the mechanical strength of the shadow mask can be made higher than that of a known shadow mask of this type. The occurrence of doming due to the vibration of can be reduced.

In order to achieve the second object,
The color cathode ray tube provided with the shadow mask of the present invention has a horizontal hole pitch Ph of a large number of electron beam passage holes in the shadow mask vertical direction, a distance Y from the center to the vertical end portion, and a vertical distance from the center in the vertical direction. Distance to arbitrary position is y
And when, between them,

[0011]

(Equation 1)

There is provided a second means formed so as to satisfy the above.

According to the second means, as an approximate expression representing the variable ratio of the horizontal hole pitch from the horizontal center line of the shadow mask to the vertical end direction, the approximate expression from the horizontal center line to the vertical end direction is obtained. By using an approximate expression of any order within the range of 1/5 (= 0.2) to 2 of the distance, the curved surface at the vertical end of the shadow mask does not become unnecessarily small, and the shadow mask curved surface In addition, no reverse warpage occurs, and furthermore, the stripe shape of the fluorescent screen does not bend, and the image displayed on the display surface of the color cathode ray tube does not feel uncomfortable.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In a preferred embodiment of the present invention, a color cathode ray tube provided with a shadow mask has a large number of slot-like electron beam passage holes in a hole portion of the shadow mask, and a large number of electron beam passage holes. Is formed so as to be uniform in a fixed area on both sides of a vertical center line of the shadow mask, and to gradually increase gradually from the fixed area to the lateral end. A shadow mask formed so as to gradually decrease gradually from a center line to a vertical end, wherein a horizontal hole pitch at a vertical center portion in a certain area is P _HO , and a horizontal end corresponding to the vertical center portion. When the horizontal hole pitch of the part is P _HX , the horizontal hole pitch of the vertical end part in a certain area is P _HY , and the horizontal hole pitch of the corner part is P _HC , The hole pitch of the plurality of electron beam passage holes is formed so that 0.94 · P _HO ≦ P _HY ≦ 0.98 · P _HO 1.05 · P _HX ≦ P _HC ≦ 1.15 · P _HX is satisfied. Is what it is.

According to this embodiment of the present invention, the horizontal hole pitch of a number of slot-like electron beam passage holes is:
It is uniform in a certain area in the center of the shadow mask, and the hole pitch P _HY of the vertical end in the certain area is larger than 0.94 times the hole pitch P _HO of the center in the certain area, The hole pitch P _HO is formed to be smaller than 0.98 times the hole pitch P _HO , and the hole pitch P at the corner is P
_HC is larger than 1.05 times the hole pitch P _HX at the lateral end corresponding to the center in a certain area,
Since it is formed so as to be within a range smaller than 1.15 times _HX , the mechanical strength of the shadow mask is hardly impaired, and the external vibration applied to the shadow mask causes the shadow mask to vibrate. The occurrence of doming based on this can be reduced.

In one preferred embodiment of the present invention, the horizontal hole pitch of a large number of electron beam passage holes is Ph, the hole pitch in the vertical direction of the shadow mask is from the horizontal center line of the shadow mask. Assuming that the distance to the vertical end is Y and the distance from the horizontal center line to any vertical position is y,

[0017]

(Equation 1)

The hole pitch of a large number of electron beam passage holes is formed so as to satisfy the above.

According to one preferred embodiment of this embodiment of the present invention, the variable rate of the approximate expression for setting the horizontal hole pitch in the vertical direction in a large number of slot-like electron beam passage holes is determined in the horizontal direction. The order less than the second order of the distance from the center line to the vertical end direction, specifically, 1/5 (=
0.2) to 2 or so, the vertical curved surface of the shadow mask does not become unnecessarily small, and the curved surface of the shadow mask is not reverted. As a result, the mechanical strength of the shadow mask can be increased, and the stripe shape of the fluorescent screen is curved, so that a sense of discomfort to the display screen displayed by the color cathode ray tube can be reduced.

[0020]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing a schematic configuration of an embodiment of a color cathode ray tube having a shadow mask according to the present invention.

In FIG. 1, 1 is a panel portion, 2 is a neck portion, 3 is a funnel portion, 4 is a face plate, 5 is a fluorescent film, 6 is a shadow mask, 6A is an effective portion, 6S is a skirt portion, and 7 is a skirt portion. A support frame, 8 is a deflection yoke, 9 is an electron gun, 10 is a purity adjustment magnet, 11 is a center beam static convergence adjustment magnet, 12 is a side beam static convergence adjustment magnet, and 13 is an electron beam.

The vacuum envelope (bulb) constituting the color cathode ray tube has a panel section 1 disposed on the front side, an elongated cylindrical neck section 2 containing an electron gun 9 therein, and a panel section 1. And a funnel part 3 having a substantially funnel shape connecting the neck part 2. The panel unit 1 includes a face plate 4 on the front surface, and a fluorescent film 5 is formed on the inner surface of the face plate 4. A support frame 7 is fixedly arranged on the inner peripheral portion of the panel portion 1, and a skirt portion 6 S of the shadow mask 6 is welded to the support frame 7 so that an effective portion 6 A of the shadow mask 6 is arranged to face the fluorescent film 5. Be worn. A deflection yoke 8 is disposed outside the joint between the funnel 3 and the neck 2. The three electron beams 13 (only one is shown in FIG. 1) projected from the electron gun 9 are deflected in a predetermined direction by the deflection yoke 8 and then pass through the electron beam passage holes of the shadow mask 6. A purity adjustment magnet 10, a center beam static convergence adjustment magnet 11, and a side beam static convergence adjustment magnet 12 are arranged side by side outside the neck portion 2 so as to be projected onto the fluorescent film 5.

In this case, the operation of the color cathode ray tube of the present embodiment, that is, the image display operation, is almost the same as the image display operation of the known color cathode ray tube of this type, and such operation is described in the related art. Is well known, and the description of the image display operation in the color cathode ray tube of the present embodiment will be omitted.

Next, FIGS. 2A and 2B are views showing an example of the configuration of a shadow mask used in the color cathode ray tube shown in FIG. 1, wherein FIG. FIG. 2B is a perspective view showing the entire configuration of the mask, and FIG. 2B is a top view showing a state in which a large number of electron beam passage holes are formed.

2 (a) and 2 (b), reference numeral 14 denotes a number of slot-like electron beam passage holes formed in the shadow mask aperture 6A, 15 denotes a vertical center line of the shadow mask 6, and 16 denotes a shadow. This is the horizontal center line of the mask 6, and the same components as those shown in FIG. 1 are denoted by the same reference numerals.

FIG. 3 is a characteristic diagram showing a change in the horizontal hole pitch of a large number of electron beam passage holes 14 formed in the shadow mask 6 used in the color cathode ray tube shown in FIG. .

In FIG. 3, the horizontal axis is the distance from the vertical center line 15 of the shadow mask 6 toward the horizontal end, and the vertical axis is the horizontal hole pitch of the electron beam passage holes 14.

In this embodiment, a large number of electron beam passage holes 14 formed in the shadow mask perforated portion 6A are provided.
Horizontal hole pitch (hereinafter simply referred to as hole pitch)
It is formed according to the rules described below.

That is, the hole pitch in the vertical direction of the shadow mask 6 is the hole pitch P at the center of the shadow mask 6.
_{When H} is P _HO and the hole pitch P _H at the vertical end corresponding to the center is P _HY , the hole pitch P _H is formed so as to gradually decrease gradually from the center to the vertical end. I have.
Further, the hole pitch in the horizontal direction of the shadow mask 6 is, within a certain range A _x on either side of the vertical center line 15 of the shadow mask 6, depending on the longitudinal position of the center,
Either hole pitch P of the hole pitch P _HO to hole pitch P _HY
Formed to be uniform in the pore pitch P _H showing a _H, while in outside a predetermined range A _x, sequentially than the hole pitch P _H of the predetermined range A _x toward the lateral end part corresponding from a range A _x As shown in the characteristic diagram of FIG. 3, the hole pitch P _HX at the horizontal end corresponding to the central portion is higher than the hole pitch increase rate at the vertical end so that the hole pitch slightly increases. The hole pitch _PHC at the corresponding lateral end portion (corner portion) is formed so as to increase the hole pitch increasing rate.

More specifically, the hole pitch P _HY at the longitudinal end corresponding to the center of the shadow mask 6 is formed to be 0.96 times the hole pitch P _HO at the center. , The hole pitch P _H from the center to the vertical end within the fixed range A _x is defined as the hole pitch P _HO at the center.
The hole pitch P _HO decreased sequentially just increments from 1x forms to be 0.96 times the final hole pitch P _HO, also corresponding to the central portion of the hole pitch P _HC corners together formed to be 1.10 times the hole pitch P _HX lateral ends to the respective hole pitches P _H up to the lateral edges corresponding thereto from a range a _x, characteristics shown in FIG. 3 accordance hole pitch increase rate based on the drawing, are formed so as to hole pitch to sequentially slightly increased by one from the hole pitch P _H within a certain range a _x.

In the shadow mask 6 of the present embodiment, the following equation (1) is used as an approximate expression for setting the hole pitch P _HO at the vertical end corresponding to the center of the shadow mask 6;

[0033]

(Equation 1)

In the equation (1), the order α is set to a value of 1.2.

According to the shadow mask 6 having such a configuration,
The diagonal radius of curvature of the shadow mask apertures 6A formed on the curved surface is smaller than the diagonal radius of curvature of the known shadow mask apertures, thereby increasing the mechanical strength of the shadow mask 6. The occurrence of doming due to the vibration of the shadow mask 6 caused by the external vibration applied to the shadow mask 6 can be reduced.

According to the shadow mask 6 having such a configuration, the curved surface in the vertical direction of the shadow mask 6 does not become unnecessarily small, and the curved surface of the shadow mask does not generate a reverse warpage. Can be increased, and the stripe shape of the fluorescent film 5 is curved, so that a sense of discomfort to the display screen displayed by the color cathode ray tube can be reduced.

In the embodiments described above, the hole pitch P _HY at the vertical end corresponding to the center of the shadow mask 6 is used.
Is formed so as to be 0.96 times the hole pitch P _HO at the center, and the hole pitch P at the corner of the shadow mask 6 is formed.
1.10 of hole pitch _PHX at the lateral end corresponding to the center of _HC
Although the description has been made by giving an example in which the number is doubled, the present invention is not limited to such numerical values (0.96 and 1.10), and the former numerical value (0.96) is 0.94 to 0. .98, and the latter value (1.10) was within the range of 1.05 to 1.15. I'm sure.

In the embodiments described above, the hole pitch P _HO at the vertical end corresponding to the center of the shadow mask 6 is set.
The order α of the equation (1) used as an approximate equation for setting
2, the order is not limited to 1.2, but may be from 0.2 to 2.0.
It has been experimentally confirmed that within the range, the effect substantially similar to the effect obtained in the above-described embodiment can be obtained.

[0039]

As described above, according to the first aspect of the present invention, the horizontal hole pitch of a large number of slot-like electron beam passage holes is uniform in a fixed area in the center of the shadow mask, and the hole pitch P _HY vertical end portion of the constant region, 0 hole pitch P _HO in the central portion within a certain area.
It is formed so as to be within a range larger than 94 times and smaller than 0.98 times the same hole pitch P _HO , and the hole pitch P _HC of the corner portion is set to the lateral end portion corresponding to the center portion within a certain area. The hole pitch P _HX is larger than 1.05 times the hole pitch P _HX and smaller than 1.15 times the hole pitch P _HX . Thus, there is an effect that the occurrence of doming due to the vibration of the shadow mask caused by the external vibration applied to the shadow mask can be reduced.

According to the second aspect of the present invention, the variable rate of the approximate expression for setting the horizontal hole pitch in the vertical direction in a large number of slot-like electron beam passage holes is determined from the horizontal center line. Since it is close to the second order or less of the distance to the vertical end direction, specifically, any order within the range of 1/5 (= 0.2) to 2, the shadow mask in the vertical direction The curved surface does not become unnecessarily small, the warpage does not occur on the curved surface of the shadow mask, the mechanical strength of the shadow mask can be increased, and the stripe shape of the fluorescent surface is curved, color There is an effect that a sense of discomfort to a display screen displayed by the cathode ray tube can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a schematic configuration of an embodiment of a color cathode ray tube having a shadow mask according to the present invention.

FIG. 2 is a configuration diagram showing an example of a shadow mask used in the color cathode ray tube shown in FIG.

FIG. 3 is a characteristic diagram showing a change in horizontal hole pitch of a large number of electron beam passage holes formed in a shadow mask used in the color cathode ray tube shown in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Panel part 2 Neck part 3 Funnel part 4 Face plate 5 Fluorescent film 6 Shadow mask 6A Perforated part 6S Skirt part 7 Support frame 8 Deflection yoke 9 Electron gun 10 Purity adjustment magnet 11 Center beam Static convergence adjustment magnet 12 Side beam Static convergence adjusting magnet 13 Electron beam 14 Electron beam passage hole 15 Vertical center line of shadow mask 6 16 Center line of shadow mask 6 in the horizontal direction

Claims (2)

[Claims] The shadow mask has a plurality of slot-shaped electron beam passage holes in a hole portion of a shadow mask, and the horizontal hole pitch of the plurality of electron beam passage holes is a fixed area on both sides of a vertical center line of the shadow mask. The shadow mask is formed so as to gradually increase gradually from the fixed area to the horizontal end, and to gradually decrease gradually from the horizontal center line of the shadow mask to the vertical end. A shadow mask having a horizontal hole pitch of P _{HO at} the center in the vertical direction in the certain region, a horizontal hole pitch of P _HX at a horizontal end corresponding to the center in the vertical direction, and a vertical end in the certain region. The horizontal hole pitch of the part is P _HY ,
Assuming that the horizontal hole pitch at the corner portion is P _HC , 0.94 · P _HO ≦ P _HY ≦ 0.98 · P _HO 1.05 · P _HX ≦ P _HC ≦ 1.15 · P A color cathode ray tube having a shadow mask, wherein a plurality of electron beam passage holes are formed with a hole pitch such that _HX is satisfied. 2. The horizontal hole pitch of the plurality of electron beam passage holes is Ph in the vertical horizontal hole pitch with reference to the horizontal center line of the shadow mask, and the vertical edge pitch from the horizontal center line. Where Y is the distance from the horizontal center line to y, and y is the distance from the horizontal center line to the arbitrary position in the vertical direction. 2. The color cathode ray tube having a shadow mask according to claim 1, wherein a hole pitch of the plurality of electron beam passage holes is formed so as to satisfy the following.