JP2001135254A - Color cathode-ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a color cathode-ray tube that causes vibrations of the shadow mask to be prevented or decayed by making a vibration-proof means surely contact with the mask without generating shadows. SOLUTION: In a color cathode-ray tube that bridges a shadow mask 2 having slot-shaped (or dot-shaped) electron beam passing holes 3, grill parts 4 that extend in the direction at right angles to horizontal scanning direction of the electron beam and bridge parts connecting adjacent grill parts 4 on a pair of mask flames 28a and 28b in the direction of extending grills, damper lines 6 are laid extending in superposition with the outermost grill parts 4a of the shadow mask 2.

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, and more particularly to a color cathode ray tube, in which a shadow mask having an electron beam passage hole and a bridge portion is stretched and fixed to a mask frame.
The present invention relates to a color cathode ray tube provided with a vibration isolator for preventing or attenuating the vibration of the shadow mask.

[0002]

2. Description of the Related Art A color cathode ray tube 21 suitable for displaying an image such as a computer terminal display or a high-definition television.
Has a structure as shown in FIG. That is, it has a bulb 25 in which the face panel 22 and the funnel 23 are integrally joined by the frit glass 24, and phosphors that emit green, blue, and red light are arranged in the form of dots or stripes inside the face panel 22. The provided phosphor screen 26 is applied and formed, and behind the phosphor screen 26, a shadow mask (hereinafter, referred to as a mask) 27 having a large number of electron beam passage holes (aperture grill type, passage hole). A shadow mask structure (hereinafter, referred to as a mask structure) 29 in which a dot having a dot and a bridge portion, and the like, are fixed to a mask frame (hereinafter, referred to as a frame) 28 at a constant interval from the inner surface of the panel. Have been. The mask structure 29 is fixed to the face panel 22 by fitting a hook spring 32 formed on a side wall of the frame 28 to a stud pin 33 planted on a side inner wall of the face panel 22.
An electron gun 31 that emits three electron beams is provided in the neck portion 30 of the funnel. Also, the electron gun 31
A deflection yoke 32 is disposed outside the cone portion of the funnel in front of the device.

The color cathode ray tube 2 constructed as described above
In FIG. 1, three electron beams R, G, and B emitted from an electron gun 31 are deflected in a horizontal direction and a vertical direction by a deflection yoke 32, and are selected in color by a mask 27. The image is displayed by illuminating the phosphor film by emitting light.

A typical representative mask structure in the prior art is, for example, an aperture grill type disclosed in Japanese Patent Application Laid-Open No. 6-314547. As shown in the perspective view of FIG. 8, the opposite ends of an aperture grill type mask 27a provided with a plurality of grid elements 34 at a predetermined pitch are stretched on a pair of opposite frames 28a, 28b. It is manufactured by welding and fixing. This frame 28a,
A pair of supporting frames 28c and 28d supporting the supporting member 28b are made of an elastic member, and the upper and lower ends of the mask 27a are framed by applying an external force so that the space between the frames 28a and 28b is reduced by a predetermined amount due to its elastic deformation. 2
8a and 28b are welded and fixed, and then the force is removed to apply a tension in the vertical direction (y direction in the figure) to the mask 27a. Further, in order to prevent or attenuate the vibration of the mask, a plurality of damper lines 35 are provided so as to intersect and adhere to the grid element 34.

However, in the color cathode ray tube provided with the aperture grill type mask structure constructed as described above, since a plurality of damper wires 35 are stretched across the opening through which the electron beam passes, x Since the electron beam scanned in the direction collides and scatters with the damper line 35 and does not strike the corresponding fluorescent film, the fluorescent film does not emit light, the shadow of the damper line is reflected on the image display surface, and the display quality deteriorates. was there.

Therefore, a color cathode ray tube for solving this problem is disclosed in, for example, Japanese Patent Application Laid-Open No. 8-227667. FIG. 9 is a perspective view of a mask structure used in the color cathode ray tube. As shown in FIG.
A discontinuous opening of an electron beam passage hole, a grill portion 37 extending in a direction (y direction) orthogonal to a horizontal scanning direction (x direction) of the electron beam, and a bridge connecting these adjacent grill portions The opposite end of the slot type mask 27b having the portion 38 is
8a and 28b, which are manufactured by welding and fixing in a stretched state. In particular, it is characterized in that an anti-vibration wire (damper wire) 40 is stretched over the grill portion 37 extending to the perforated region. In this configuration, since the damper line does not cross the electron beam passage hole, no shadow of the damper line occurs.

[0007]

By the way, as shown in FIG. 9, a slot type mask 27b is fixed by welding on a pair of opposed frames 28a and 28b in a stretched state, and a grill portion 37 in a perforated area of the mask is provided. In a conventional mask structure in which a vibration-proof wire (damper wire) 40 is stretched so as to overlap with the above, the vibration of the mask can be prevented or attenuated to some extent by the vibration-proof wire (damper wire) 40, but the effect is not sufficient. Did not. Then, the present inventor investigated in detail the cause and found that there was a portion where the anti-vibration wire and the mask did not sufficiently contact. Hereinafter, this will be described in detail with reference to the drawings. FIG. 10A is an enlarged plan view of a main part of the slot type mask 27b in the stretched state shown in FIG. 9 as viewed from the mask side, and FIG.
It is an important section expanded sectional view of a mask which meets a DD line of (a). As shown in FIG. 10B, in the perforated area of the mask, the mask is bent below the upper surface (welding surface) position P (shown by a broken line) of the frame 28a (28b). This bending is more remarkable at the center of the mask. For this reason, the mask 27b and the anti-vibration wire 40 are not in contact with each other at the bent portion, and the anti-vibration effect is reduced. It is considered that the deflection of the mask is due to the following reasons. That is, all the grill portions 37 of the slot type mask 27b are connected in the horizontal direction (x direction) by the bridge portions 38. For this reason,
When the slot type mask 27b is extended in the y direction, a tension is also generated in the x direction of the mask due to the influence of the bridge portion 38. As a result, as shown in FIG. 10B, in the perforated area of the mask, the mask bends below the upper surface position P of the frame 28a (28b). In a cylindrical mask having a curvature in the x direction, the deflection of the mask is further promoted,
This becomes more noticeable as the radius of curvature becomes smaller.

As described above, even if the vibration-proof wire (damper wire) 40 is stretched over the grill portion in the perforated area as shown in FIG. 9 of the prior art, as shown in FIG. In the part where the mask is bent downward, anti-vibration wire (damper wire)
Since the mask 40 does not come into contact with the slot type mask 27b, the vibration of the mask due to an external impact or the like cannot be prevented or attenuated, and the landing of the electron beam is deteriorated, and the image quality such as the color purity is deteriorated. A new problem has arisen.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has as its object to stretch a vibration damping means such as a damper wire so as not to cross an electron beam passage hole so that a shadow thereof does not occur. In addition, an object of the present invention is to provide a color cathode ray tube including a mask structure capable of preventing or attenuating the vibration of the mask by reliably contacting the vibration isolating means such as a damper wire with the mask.

[0010]

A color cathode ray tube according to the present invention comprises a slot-shaped (or dot-shaped) electron beam passage hole, and a grill portion extending in a direction perpendicular to the horizontal scanning direction of the electron beam. In a color cathode-ray tube in which a mask having a bridge portion connecting adjacent grill portions is stretched and fixed on a pair of frames in a direction in which the grill extends, a surface side of the outermost grill portion of the mask is provided. It is characterized in that it is provided with a vibration isolating means which is stretched and extended to the warped portion. With this configuration, the vibration isolating means such as the damper wire can be reliably brought into contact with the mask without producing a shadow, so that a color cathode ray tube in which the vibration of the mask is prevented or attenuated can be provided.

Further, the color cathode ray tube of the present invention has a slot-shaped (or dot-shaped) electron beam passage hole, a grill portion extending in a direction orthogonal to the horizontal scanning direction of the electron beam, and an adjacent grill. A mask having a bridge portion connecting the portions, the color cathode-ray tube being fixed on a pair of frames by extending in the direction in which the grill extends, and extending on the front and back surfaces of the outermost grill portion of the mask. It is characterized by having vibration isolating means stretched over. With this configuration,
Since the outermost grill portion of the mask is sandwiched from both sides by vibration isolating means such as a damper wire, it is possible to provide a color cathode ray tube in which vibration of the mask is more effectively prevented or attenuated.

Further, the color cathode ray tube of the present invention is characterized in that a groove is formed on a pair of frames, and a vibration isolating means is mounted in the groove. With this configuration, the accuracy of the position at which the vibration isolator is mounted is improved, and the effect of preventing or attenuating the vibration of the mask becomes constant.

Further, the color cathode ray tube of the present invention is characterized in that the formation position of the vibration isolator stretched on the front side is outside the formation position of the vibration isolator stretched on the back side. I do. With this configuration, since the outermost grill portion of the mask is sandwiched at different positions from both the front and back sides, the vibration of the mask can be more effectively prevented or attenuated.

In the color cathode ray tube according to the present invention, a notch is formed in the outermost grill portion of the mask toward the center of the mask, and the notch portion is stretched so as to extend over the grill portion. And a vibration isolating means. With this configuration, vibration of the mask can be more effectively prevented or attenuated.

Further, the color cathode ray tube of the present invention is characterized in that the vibration isolating means is a plate-like member, and the plate-like member is provided with reinforcing means. With this configuration, deformation and twisting of the plate-shaped member at the time of temperature rise and the like are eliminated, so that vibration of the mask can be effectively prevented or attenuated.

Further, the color cathode ray tube of the present invention is characterized in that the vibration isolating means is a plate-like member, and a curved portion is formed at an end of the plate-like member. With this configuration, the tension increases due to the elasticity of the curved portion, so that the vibration of the mask can be effectively prevented or attenuated.

[0017]

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a slot-shaped (or dot-shaped) electron beam passage hole, a grill portion extending in a direction perpendicular to the horizontal scanning direction of the electron beam, and an adjacent grill portion. A mask having a bridge portion to be connected,
The present invention relates to a color cathode ray tube which is fixed on a pair of frames by being stretched in a direction in which a grill extends, a characteristic portion of the invention lies in a structure of a mask structure, and at least a portion of an outermost grill portion of the mask. In other words, the anti-vibration means is stretched on the surface side. The present invention is based on the results of a detailed investigation by the present inventors. That is, according to the investigation results, as shown in FIG. 10, when the mask having the bridge portion 38 of the slot type or the dot type is stretched in the y direction, the upper surface of the frame 28a (28b) is formed in the perforated region of the mask. (Welding surface) The mask tends to bend below the position P (back side). This is particularly remarkable in a cylindrical mask having a curved surface in the x direction and a flat surface in the y direction. In a flat mask in which both the x direction and the y direction are flat, the bending is slight.
On the other hand, at the outermost grill portion 37a of the mask, both cylindrical and planar types have the effect that the outermost end 27c of the mask is a free end, and are equal to or larger than the upper surface position of the frame 28a (28b). It became clear that the upper part (surface side) was bent (or warped) by about several tens μm. Therefore,
The anti-vibration means can be reliably brought into contact with the mask by superimposing the anti-vibration means on the grill portion 37a which is warped to the outermost surface side, and the vibration of the mask can be reliably anti-vibrated or attenuated. It can be.

Hereinafter, a first embodiment of a color cathode ray tube according to the present invention will be described with reference to the drawings. FIG. 1 (a)
Is a mask structure 1 mounted on the color cathode ray tube of the present invention.
FIG. 4 is an enlarged perspective view of a main part, as viewed from the front side of the mask. FIG.
(B) is a principal part enlarged sectional view of the outermost grill part along the AA line. As shown in FIG. 1A, the slot type mask 2 extends in a slot-shaped electron beam passage hole 3 in a direction (y direction) orthogonal to a horizontal scanning direction (x direction) of the electron beam. A grill portion 4 and a bridge portion 5 connecting adjacent grill portions are formed. Due to the presence of the bridge portion 5, the slot type mask 2 is moved in the horizontal direction (x
Direction). This slot type mask 2
Is stretched and fixed on the pair of frames 28a and 28b in the direction in which the grill extends (y direction). In particular, a damper wire 6 made of a metal wire such as tungsten, stainless steel or the like as a vibration isolator is provided on a portion 4a 'of the slot type mask 2 which is warped toward the surface of the left and right outermost grill portions 4a. It is stretched and fixed in the direction in which it is located. Both ends of the damper wire 6 are fixed to the side surfaces of the frames 28a and 28b directly or via an elastic member 7 such as a leaf spring or a spring. With this configuration, as shown in an enlarged manner in FIG. 1B, the portion 4 warped to the front side of the grill portion 4a is formed.
a 'is pushed downward by the damper wire 6, and the frame 28a
It is located on substantially the same plane as the upper surface P of (28b). Since the damper wire 6 makes strong contact with the mask at the grill portion 4a, the vibration damping effect is high. In order to enhance the anti-vibration effect, it is desirable to stretch the damper wire 6 near the outer end of the grill portion 4a where the warp is large (particularly, from the middle to the outside of the width of the grill portion 4a).

As another specific example of the vibration isolating means, a plate member 8 having elasticity such as stainless steel can be stretched in place of the damper wire 6 as shown in FIG. In particular, FIG.
As shown in (a), when reinforcing means such as cut-and-raised 8a and embossed (not shown) are formed in the plate-shaped member 8, deformation and torsion of the plate-shaped member 8 can be prevented, and the vibration isolation effect is improved. . Further, as shown in FIG. 2B, it is also effective to form a cut-and-raised portion 8b in the plate-like member 8 downward, and to make the cut-and-raised portion 8b abut the mask end 2a. As shown in FIG. 2A, the plate member 8 may be fixed by welding the end 8c of the plate member 8 to the frames 28a and 28b.
As shown in (b), a curved portion 8d may be formed and its end may be welded. The tension of the plate-shaped member 8 can be increased by the elasticity of the curved portion 8d, so that the plate-shaped member 8 can be stretched.

Next, a second embodiment of the color cathode ray tube of the present invention will be described with reference to the drawings. FIG. 3 (a)
Is a mask structure 1 mounted on the color cathode ray tube of the present invention.
FIG. FIG. 3 (b) is the same as FIG.
FIG. 5 is an enlarged sectional view of a main part of an outermost grill portion along the line BB of FIG. FIG. 4 is an enlarged cross-sectional view of a main part of a welded portion between the outermost grill portion and the mask along the line CC in FIG. The feature of the mask structure 10 is that the outermost grill portion 4a is provided.
Is sandwiched from both sides by vibration isolating means such as a damper wire. That is, as shown in FIGS. 3A and 3B, a damper wire 1 made of a metal as a first vibration isolator is provided on the back side of the pair of outermost grill portions 4a of the mask 2.
1 is welded and fixed while being stretched in the direction in which the grill portion extends (y direction). A damper wire 6 made of metal is also fixed to the front side of the grill portion 4a as a second vibration isolator by extending in the direction in which the grill portion extends (y direction). According to the above configuration, since the outermost grill portion of the mask is sandwiched from both sides by vibration isolating means such as a damper wire, it is possible to provide a color cathode ray tube in which vibration of the mask is more effectively prevented or attenuated. It should be noted that the number of anti-vibration means is not limited to two and three
It may be more than one.

The braking effect can be improved by shifting the positions of the first vibration isolating means and the second vibration isolating means with respect to the formation position of the vibration isolating means. In FIG. 3, the position of the damper wire 6 as the second vibration isolating means is located outside the position of the damper wire 11 as the first vibration isolating means. Even if they are formed in a relation, there is a vibration proof effect. Needless to say, they may be formed on the front and back surfaces at the same position as shown by the broken lines in FIG.

The method of forming the vibration isolating means is as follows.
A groove 9 as shown in FIG. 4 is formed in advance on the surface to which the mask 28b is to be welded, and the damper wire 11 as the first vibration isolating means is buried in the groove 9 so as to be stretched. Of the frame 28 via elastic members 7 (see FIG. 3A) such as leaf springs and springs formed at both ends of the frame 28.
a, and fixed by welding to the side surfaces of 28b. Next, the mask 2 is stretched and welded in the same manner as in the prior art. Next, in the same manner as in FIG. 1, a damper wire 6 as a second vibration isolator is stretched over the surface of the mask 2 and fixed to the side surfaces of the frames 28a and 28b via the elastic members 7 by welding. The cross-sectional shape of the groove 9 is not limited to the V-shape, but may be rectangular or U-shape, and is selected according to the shape of the vibration isolating means. It is necessary to determine the size of the groove so that the upper surface of the first vibration isolator attached to the groove is flush with the welding surfaces of the masks 28a and 28b so that the welding surface of the mask 2 is not uneven. The groove 9 is useful for accurate positioning of the damper wire.

Another specific example of the anti-vibration means formed on the front and back surfaces will be described with reference to FIG. FIG. 5A shows FIG.
Instead of damper wires 11 and 6 shown in FIG. 4, plate members 12 and 13 made of elastic material such as stainless steel are stretched. The plate member 12, which is the first vibration isolating means, is
a, 28b are mounted in rectangular grooves 9 formed in the welding surfaces. The mask 2 is stretched thereon, and a plate member 13 as a second vibration isolator is placed on the grill portion 4a of the mask 2 so as to overlap the surface of the mask 2 and is stretched over the frames 28a and 28b. The plate member 12 stretched on the back side of the mask 2 includes
A cut-and-raised portion (not shown) may be formed as a reinforcing means. Plate member 13 stretched on the front side of mask 2
2A, a cut-and-raised portion (not shown) as shown in FIG. 2A may be formed, or a cut-and-raised portion as shown in FIG. 2B may be formed. The cut-and-raised portion may contact the mask end 2a. Further, the curved portions described with reference to FIG. 2B may be formed at the ends of the plate members 12 and 13. Since the plate-shaped member has a larger contact area with the mask than the damper wire, the vibration-proof effect is improved. FIG. 5B shows an example in which the damper wire 6 and the plate member 12 are combined.

Next, a third embodiment of the color cathode ray tube of the present invention will be described with reference to the drawings. In the mask structure 15 of this embodiment, a notch 17 is formed in the outermost grill portion 4a of the mask 16 toward the center of the mask as shown in FIG. In addition, vibration damping means such as a damper wire 6 is stretched over the grill portion 4a. In this configuration, the notch portion 17 is formed to change the tension distribution of the mask to change the vibration pattern, and the damper wire 6 suppresses the vibration of the grill portion. The vibration effect can be improved. The cutout portion 17 may be formed over the entire grill portion 4a, or may be formed at a part (such as a central portion) of the grill portion 4a. Also, various shapes of the notch 17 are preferable. For example, as shown in FIG.
a, a trapezoidal notch formed over the entire grill portion 4a as shown in FIG. 6 (b), and a grill portion as shown in FIG. 6 (c). A notch such as a substantially semicircle or a semi-ellipse formed in a part of the grille 4a, and a rectangular notch formed in a part of the grill part 4a as shown in FIG. It is. In the case where it is formed in a part of the grill portion 4a, a plurality of notches may be formed. Further, as the vibration isolating means to be combined, not only the damper wire 6 but also the above-mentioned various plate-like members may be used, and it goes without saying that the vibration isolating means may be sandwiched from the front and back. In addition, the formation position of the vibration isolating means may avoid the notch as shown in FIGS. 6A and 6B, or may overlap with the notch as shown in FIGS. 6C and 6D. You may.

[0025]

The color cathode ray tube according to the present invention has a slot-shaped (or dot-shaped) electron beam passage hole, a grill portion extending in a direction perpendicular to the horizontal scanning direction of the electron beam, and an adjacent grill. In a color cathode ray tube in which a mask having a bridge portion connecting the portions is stretched and fixed on a pair of frames in a direction in which the grill extends, the mask extends over the outermost grill portion of the mask. It is characterized by having a vibration isolating means stretched. With this configuration, the vibration isolating means such as the damper wire can be reliably brought into contact with the mask without producing a shadow, so that a color cathode ray tube in which the vibration of the mask is prevented or attenuated can be provided.

[Brief description of the drawings]

FIG. 1A is a perspective view showing a first embodiment of a shadow mask structure provided in a color cathode ray tube of the present invention, and FIG. 1B is an enlarged sectional view of a main part along line AA.

FIG. 2 is a perspective view of a main part showing another specific example (a) or (b) of the vibration isolator.

FIGS. 3A and 3B are a perspective view showing a second embodiment of a shadow mask structure provided in the color cathode ray tube of the present invention, and an enlarged cross-sectional view of a main part taken along line BB of FIG.

FIG. 4 is an enlarged sectional view of a main part taken along line CC of FIG. 3 (a).

FIG. 5 is a perspective view of a main part showing another specific example (a) or (b) of the vibration isolator.

FIG. 6 is a plan view of a principal part showing a third embodiment of the shadow mask structure provided in the color cathode ray tube of the present invention ((a) to (d) are examples of the shape of the shadow mask).

FIG. 7 is a cross-sectional view including a partial side view of a conventional color cathode ray tube.

FIG. 8 is a perspective view of a shadow mask structure provided in a conventional color cathode ray tube.

FIG. 9 is a perspective view of another shadow mask structure provided in a conventional color cathode ray tube.

FIG. 10 is a plan view (a) of a mask structure for explaining a problem of a conventional slot type shadow mask structure in which a vibration-proof wire is stretched so as to be superimposed on a grill portion in a perforated area of the shadow mask, and FIG. Sectional view of main part along line D (b)

[Explanation of symbols]

 1, 10, 15 shadow mask structure 2, 16 shadow mask 3 electron beam passage hole (for example, slot) 4 grill portion 4a outermost grill portion 5 connection portion of adjacent grill portion 6, 11 damper wire (vibration isolation means) 7 Elastic member (for example, spring, leaf spring) 9 Groove 8, 12, 13 Plate member (vibration isolating means) 17 Notch portion 28a, 28b of mask 28 Mask frame 28c, 28d Support frame

Claims (8)

[Claims] 1. A slot-shaped (or dot-shaped) electron beam passage hole, a grill portion extending in a direction orthogonal to a horizontal scanning direction of an electron beam, and a bridge portion connecting adjacent grill portions. In a color cathode-ray tube in which a shadow mask having a color is stretched and fixed on a pair of mask frames in the direction in which the grill extends, a protection that extends and is stretched on the surface of the outermost grill portion of the shadow mask. A color cathode ray tube comprising a vibration means. 2. A slot-shaped (or dot-shaped) electron beam passage hole, a grill portion extending in a direction perpendicular to the horizontal scanning direction of the electron beam, and a bridge portion connecting adjacent grill portions. In a color cathode-ray tube in which a shadow mask having a mask is stretched and fixed on a pair of mask frames in the direction in which the grill extends, the shadow mask extends and stretches on the front and back surfaces of the outermost grill portion of the shadow mask. A color cathode ray tube comprising a vibration isolating means. 3. A groove is formed on a pair of mask frames,
3. A color cathode ray tube according to claim 2, wherein a vibration isolating means is mounted in said groove. 4. The color cathode ray tube according to claim 3, wherein the depth of the groove formed on the pair of mask frames corresponds to the thickness of the vibration isolator. 5. The method according to claim 2, wherein the formation position of the vibration isolator stretched on the front side of the shadow mask is outside the formation position of the vibration isolator stretched on the back side. The color cathode ray tube as described. 6. An outermost grill portion of a shadow mask,
The color cathode ray tube according to any one of claims 1 to 5, wherein a notch is formed toward a center of the mask. 7. A color cathode ray tube according to claim 1, wherein said vibration isolating means is a plate-like member, and said plate-like member is provided with reinforcing means. . 8. The device according to claim 1, wherein the vibration isolator is a plate-like member, and a curved portion is formed at an end of the plate-like member. Color cathode ray tube.