JP2001325892A - Color cathode-ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a color cathode-ray tube capable of preventing deformations of a shadow mask body, securely inhibiting miss-landing of electron beams, and preventing deteriorating of color purity. SOLUTION: The color cathode-ray tube is provided with a shadow mask body 30, having a generally rectangular shape where multiple holes for electron beams to pass are formed on a face opposite to a phosphor screen, a mask frame 36 having a sidewall part in the axial direction of the tube of a generally rectangular frame shape, which is fitted to a peripheral part of the shadow mask body 30, and a bottom part extended in the axial direction of the tube; and a plurality of elastic support bodies 19 for supporting the mask frame 36 and the shadow mask body 30, where one end of each is fitted to an outer periphery of the sidewall part of the mask frame 36, and the other end is engaged with a support pin provided on an inner periphery of a panel. Projected parts 39 are provided in a border area between the sidewall part and the bottom part of the mask frame 36, be projected in the opposite direction of the bottom part.

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 the structure of a mask frame is improved, deformation of a shadow mask is suppressed, and deviation of landing of an electron beam is reduced.

[0002]

2. Description of the Related Art Generally, as shown in FIGS. 11 to 14, a color cathode ray tube has a substantially rectangular panel 53 provided with a skirt portion 52 around an effective surface 51 formed of a curved surface.
And a funnel-shaped funnel 54,
Three electron beams (57R, 57G, and 57G) emitted from an electron gun 56 disposed in a neck portion 55 of the funnel 54.
57B) is deflected by a deflecting device 58 mounted on the outside of the funnel 54, and passes through the electron beam passage hole 60 of the substantially rectangular shadow mask 59 into the gap of the light absorbing layer 61.
A color image is displayed by horizontally and vertically scanning the phosphor screen 63 formed on the inner surface of the panel 53 so that the color phosphor layers 62 (62R, 62G, 62B) are embedded.

The shadow mask 59 has a plurality of electron beam passage holes 60 formed in a main surface portion 64 having a curved surface facing the phosphor screen 63, and a skirt portion 65 is provided around the main surface portion 64. The shadow mask body 66 is formed of a rectangular shadow mask body 66 and a mask frame 68 having a substantially L-shaped cross section on each side having a side wall 67 welded to the skirt portion 65 of the shadow mask body 66. ing.

As a method of supporting the shadow mask main body 66, as shown in FIG.
A substantially wedge-shaped elastic support 69 is attached to the side wall of the corner of the panel 53, and the elastic support 69 is fixed to a support pin (stud pin) 70 provided on a skirt portion of the corner of the panel 53. There is a method of detachably supporting inside the unit.

In such a color cathode ray tube, in order to obtain a color image without color shift on the phosphor screen 63, three electron beams (57R, 67G) passing through the electron beam passage hole 60 of the shadow mask body 66 are used. , 57
B) must land properly on the three-color phosphor layer 62, respectively. For that purpose, it is necessary to bring the shadow mask 59 into a correct positional alignment relationship with the panel 53.

[0006]

In recent years, color cathode ray tubes have been used for terminal equipment such as computers in response to multimedia applications. Since the arrangement pitch of the color phosphor layers 62 is small, the landing margin of the electron beam is small, and color misregistration is likely to occur.
Therefore, more accurate electron beam landing accuracy is required.

However, actually, the shadow mask body 66
The mask frame 68 is attached in contact with the entire circumference of the panel 53, so that the shadow mask body 66 is attached with an unbalanced and undesired force applied to the panel 53 due to variations in the shape and dimensions of the mask frame 68. The positional accuracy of the shadow mask main body 66 may decrease.

Particularly, in a color cathode ray tube having an aspect ratio of 16: 9, which has been put into practical use in recent years, the longer side of the mask frame 68 is larger than the shorter side as compared with the conventional color cathode ray tube. The shadow mask main body 66 is liable to be deformed due to deterioration in strength, and variations in shape and dimensions.

In the manufacturing process of the color cathode ray tube, the attachment and detachment of the shadow mask 59 to and from the panel 53 are repeated, and the force applied at the time of attachment and detachment causes the mask frame 68 to be distorted. The side wall portion 67 is deformed in the direction opposite to the tube axis (the direction in which it expands), and such a mask frame 68 is formed.
Distortion also occurs in the shadow mask body 66 due to the distortion of
The beam landing shifts with respect to the three-color phosphor layer 62,
Color shift occurs in the color image.

Moreover, in the above-described color cathode ray tube, the landing margin of the electron beam is small, and it is necessary to reduce the displacement of the shadow mask body 66 due to an external impact as much as possible. It is also necessary to reduce the load on the elastic support 69 in order to reduce the displacement caused by the impact.

However, in order to reduce the load on the elastic support 69, for example, when the mask frame 68 is reduced in weight, the mechanical strength with respect to the force applied when attaching and detaching the shadow mask in the process of manufacturing the color cathode ray tube decreases. The misalignment of the shadow mask main body 66 with respect to the panel 53 occurs.

As a measure for preventing such a decrease in the strength of the mask frame 68, as shown in FIGS. 15 and 16, a bead portion 71 is formed on the side wall 67 of the mask frame 68 so as to protrude toward the inside thereof. There are ways to prevent the drop.

However, even if the bead portion 71 is formed, a sufficient effect cannot be obtained unless the bead portion is formed in an appropriate shape. At present, the force applied when the shadow mask 59 is attached and detached in the production process of the color cathode ray tube is caused. A mask frame 6 having a substantially L-shaped cross section on each side that is deformed or integrally formed by press molding or the like.
8 indicates that the angle θ1 between the side wall 67 and the bottom surface 67a shown in FIG. 16 and the angle θ2 of the side wall of the bead 71 with respect to the bottom surface 67a shown in FIG. As a result, a position shift of the shadow mask 59 in the shadow mask main body 66 with respect to the panel 53 occurs.

Further, in a color cathode ray tube or the like having a small arrangement pitch of the three-color phosphor layers 62 shown in FIG.
Is reduced in thickness to reduce unevenness due to variations in the shape and dimensions of the beam passage holes 60 of the shadow mask body 66.

However, when the thickness of the shadow mask body 66 is reduced, its mechanical strength is reduced and the shadow mask 66 is easily deformed. In particular, in a color cathode ray tube having an aspect ratio of 16: 9, the intensity difference between the long side and the short side of the mask frame 68 is large, and the mask body is deformed by the deformation on the long side where the intensity is weak.

Also, with respect to a deviation in beam landing due to doming caused by the shadow mask main body 66 being heated and expanded by the collision of the electron beam 57, a shadow mask made of a low thermal expansion material such as amber having a large control effect is used. Japanese Patent Application Laid-Open No. 5-12 / 1993
A technique disclosed in Japanese Patent No. 1009 is proposed.

As shown in FIGS. 17 and 18, this employs a structure in which a plurality of projections 81 are provided on the side wall of the mask frame 80 along the tube axis direction.

However, in this case, since the cross-sectional shape of the convex portion 81 is also substantially L-shaped as shown in FIG. 19, the cross-sectional shape of each side press-molded by integral molding or the like is substantially L-shaped. During the heat process at 80, the angle formed between the side wall portion 82 and the bottom surface portion 83 becomes larger than a desired angle,
As in the case shown in FIG. 16, there is a problem that the position of the shadow mask 90 is shifted with respect to the panel.

As described above, in a color cathode ray tube used for a terminal device of a computer or the like, in order to improve the resolution, the arrangement pitch of the three-color phosphor layers is reduced as compared with a normal color cathode ray tube, In order to alleviate the displacement caused by the light, the weight of the mask frame is reduced to reduce the load on the elastic support, or the thickness of the shadow mask body is reduced to prevent unevenness of the phosphor screen, and the shape and size of the electron beam passage holes vary. To reduce unevenness.

In such a case, the structure and arrangement of the shadow mask main body and the mask frame are extremely important in order to prevent a color shift due to a beam landing shift from the three-color phosphor layer. With the conventional shape of the shadow mask body described above, there is a problem in the mechanical strength of the mask frame, and there is a problem that deviation of beam landing cannot be sufficiently prevented.

The present invention has been made to solve the above-mentioned problems, and can prevent deformation of a shadow mask main body while avoiding a decrease in mechanical strength, and can reliably suppress electron beam mislanding. An object of the present invention is to provide a color cathode ray tube capable of preventing a decrease in color purity.

[0022]

According to the first aspect of the present invention,
A shadow mask having a substantially rectangular mask skirt portion is disposed opposite to the phosphor screen formed on the inner surface of the substantially rectangular panel, and the shadow mask is provided with a large number of electron beams on a surface facing the phosphor screen. A mask having a substantially rectangular shadow mask main body having a through hole formed therein, a substantially rectangular frame-shaped side wall portion extending along the tube axis direction, and a bottom surface portion extending in the tube axis direction attached to a peripheral portion of the shadow mask main body. A plurality of elastic supports for supporting the mask frame and the shadow mask main body having one end attached to an outer periphery of a side wall portion of the frame and the mask frame and the other end locked to a support pin provided on the inner periphery of the panel; In a color cathode ray tube having a body, a projecting portion projecting in a direction opposite to the bottom portion is provided in a boundary region between the side wall portion and the bottom portion of the mask frame. It is characterized in that the digits.

According to the present invention, the mask frame is provided with a protrusion projecting in a direction opposite to the bottom surface in a boundary region between the side wall and the bottom surface. In addition to the mechanical strength of the color cathode ray tube being strengthened, even in the heating step during the manufacturing process of the color cathode ray tube, by providing the protruding portion in an appropriate position, the opening angle of the side wall becomes larger than a desired angle. Accordingly, it is possible to provide a color cathode ray tube which does not cause deformation of the shadow mask main body and can suppress occurrence of a deviation in landing of an electron beam.

According to a second aspect of the present invention, a shadow mask having a substantially rectangular mask skirt portion is disposed so as to face the phosphor screen formed on the inner surface of the substantially rectangular panel. A substantially rectangular shadow mask body having a large number of electron beam passage holes formed on a surface facing the body screen, and a substantially rectangular frame-shaped side wall and a tube extending along the tube axis attached to the periphery of the shadow mask body. A mask frame having a bottom portion extending in the axial direction is formed, and one end is attached to an outer periphery of a side wall portion of the mask frame, and the other end is fixed to a support pin provided on the inner periphery of the panel. In a color cathode ray tube having a mask frame and a plurality of elastic supports for supporting a shadow mask body, a boundary region between a side wall portion and a bottom surface portion of the mask frame is provided. A protruding portion that protrudes in a direction opposite to the bottom surface portion and generates a suppressing force that suppresses expansion deformation of the side wall portion with respect to the bottom surface portion caused by heat applied to the mask frame. .

According to the present invention, as in the case of the color cathode ray tube according to the first aspect, a decrease in the mechanical strength of the mask frame can be suppressed, and also in the heating step during the manufacturing process of the color cathode ray tube. By providing a protruding portion projecting in the opposite direction to the bottom portion of the mask frame formed by press molding or the like at an appropriate position, the side wall portion is opened at a larger angle than a desired angle with respect to the bottom portion. Deformation can be suppressed, thereby providing a color cathode ray tube that does not cause deformation of the shadow mask main body and can suppress occurrence of deviation of landing of an electron beam.

According to a third aspect of the present invention, in the color cathode ray tube according to the first or second aspect, the projecting portion projecting in a direction opposite to a bottom surface of the mask frame is at least a pair of long sides of the mask frame. In the boundary region between the side wall portion and the bottom portion.

According to the present invention, the aspect ratio is particularly 1
In the color cathode ray tube having a large long side dimension such as 6: 9, deformation of the long side of the mask frame where the strength of the mask frame is low can be suppressed by the protruding portion, thereby causing deformation of the shadow mask body. In addition, it is possible to provide a color cathode ray tube that can suppress the occurrence of a shift in electron beam landing.

According to a fourth aspect of the present invention, in the color cathode ray tube according to the first or second aspect, the projecting portion projecting in a direction opposite to a bottom surface of the mask frame is at least a pair of long sides of the mask frame. In the boundary region between the side wall portion and the bottom surface portion, each is provided in a divided arrangement with a vertical axis passing through the tube axis interposed therebetween.

According to a fifth aspect of the present invention, in the color cathode ray tube according to the first or second aspect, the projecting portion projecting in a direction opposite to a bottom surface of the mask frame is at least a pair of long sides of the mask frame. The boundary region between the side wall portion and the bottom surface portion is provided in an arrangement including a portion through which a vertical axis passing through the pipe axis passes.
The color cathode ray tube as described.

According to the fourth and fifth aspects of the present invention, the projection is provided in a divided arrangement with respect to the vertical axis passing through the pipe axis or in an arrangement including a portion through which the vertical axis passes through the pipe axis.
As in the case of the third aspect of the invention, in particular, the deformation of the side wall portion on the long side of the mask frame where the strength is weak in the color cathode ray tube having a large long side such as the aspect ratio of 16: 9 is suppressed by the protrusion. Accordingly, it is possible to provide a color cathode ray tube which does not cause deformation of the shadow mask body and can suppress occurrence of deviation of landing of an electron beam.

According to a sixth aspect of the present invention, in the color cathode ray tube according to the first or second aspect, the projecting portion projecting in a direction opposite to a bottom surface of the mask frame is provided on a pair of long sides of the mask frame. It is provided in a boundary region between the side wall portion and the bottom surface portion and in a boundary region between the pair of short side wall portions and the bottom surface portion.

The protruding portions are provided in a boundary region between the pair of long side walls and the bottom surface of the mask frame and in a boundary region between the pair of short side walls and the bottom surface, respectively. Therefore, the deformation of the side walls on both the pair of long sides and the pair of short sides can be suppressed by the respective protrusions, thereby preventing the entire deformation of the shadow mask main body and the landing of the electron beam. It is possible to provide a color cathode ray tube capable of suppressing the displacement more reliably.

According to a seventh aspect of the present invention, in the color cathode ray tube according to the sixth aspect, the projecting portion projecting in a direction opposite to a bottom surface of the mask frame has a vertical axis and a short axis passing through a tube axis on a long side. It is characterized in that it is provided in a divided arrangement with a horizontal axis passing through the side tube axis interposed therebetween.

According to an eighth aspect of the present invention, in the color cathode ray tube according to the sixth aspect, the projecting portion projecting in a direction opposite to a bottom surface of the mask frame has a vertical axis and a short axis passing through a tube axis on a long side. It is characterized by being provided in an arrangement including a portion through which a horizontal axis passing through the side tube axis passes.

According to the seventh and eighth aspects of the present invention, the protruding portion is divided into two parts with a vertical axis passing through the long axis and a horizontal axis passing through the short axis. And a pair of long sides and a pair of long sides, respectively, in the arrangement including a portion through which the vertical axis passing through the tube axis and the horizontal axis passing through the short side tube axis pass. The deformation of the side wall portions on both short sides of the shadow mask can be suppressed by the respective projecting portions. Thereby, the entire deformation of the shadow mask main body does not occur, and the displacement of the landing of the electron beam can be suppressed more reliably. A color cathode ray tube that can be provided.

[0036]

Embodiments of the present invention will be described below in detail.

(First Embodiment) A first embodiment will be described with reference to FIGS.

FIG. 1 is a sectional view showing a schematic structure of a color cathode ray tube according to the first embodiment. FIG. 2 is a mask frame 36 and a shadow mask body 3 of the color cathode ray tube according to the first embodiment.
0, FIG. 3 is a cross-sectional view showing the configuration of the mask frame 36 and the shadow mask main body 30, FIG. 4 is a cross-sectional view showing the configuration of the mask frame 36 and the shadow mask main body 30, and FIG. FIG. 3 is a sectional view taken along line A.

The color cathode ray tube according to the first embodiment is shown in FIG.
As shown in FIG. 1, an envelope formed of a substantially rectangular panel 3 having a skirt portion 2 provided around a curved effective surface 1 and a funnel-shaped funnel 4 is provided.

A phosphor screen 13 is provided on the inner surface of the panel 3 in such a manner that a three-color phosphor layer which emits blue, green and red light is embedded in the gap between the light absorbing layers. A substantially rectangular shadow mask main body 30, which will be described later, is disposed inside the phosphor screen 13 at a predetermined distance from the phosphor screen 13.

On the other hand, an electron gun 6 for emitting three electron beams (7R, 7G, 7B) is arranged in a neck 5 constituting the funnel 4. Then, the three electron beams (7R, 7G, 7B) emitted from the electron gun 6 are deflected by the deflecting device 8 mounted outside the funnel 4, and the electron beams pass through the electron beam passage holes 33a of the shadow mask main body 30 to fluoresce. A color image is displayed by scanning the surface of the body screen 13 horizontally and vertically.

As shown in FIGS. 1 to 5, the shadow mask main body 30 has a large number of electron beam passing holes 33a formed in a main surface portion 31 having a curved surface facing the phosphor screen 13.
And a skirt portion 32 is provided around the main surface portion 31.

A mask frame 36 formed in a substantially rectangular frame shape by press molding or the like is arranged on the outer periphery of the skirt portion 32 of the shadow mask body 30.

The mask frame 36 has a side wall portion 34 to be welded in contact with the skirt portion 32 of the shadow mask main body 30 and a bottom portion 37 integral with the side wall portion 34. The substantially wedge-shaped elastic support 19 attached to the corner of the side wall 34 of the mask frame 36 is engaged with a support pin (stud pin) 20 provided on the inner surface of the skirt 2 at the corner of the panel 3. Thus, the shadow mask main body 30 is detachably supported inside the panel 3.

Further, in the first embodiment, a pair of long side walls 34 of the mask frame 36 and a bottom surface extending in the tube axis (Z-axis) direction from the edge of the side wall 34. The bottom surface portion 3 extending from the side wall portion 34 in the tube axis direction to the bent portion 38 which is a boundary region with the bottom portion 3.
7, a protruding portion 39 protruding in the opposite direction (direction toward the skirt portion 2 side). In other words, two locations are arranged on both sides of a vertical axis (Y axis) passing through the pipe axis on one long side,
On the other long side, two projections 39 are formed at two locations on both sides of a vertical axis (Y-axis) passing through the tube axis.

As an example of the shape of the protruding portion 39, a substantially rectangular parallelepiped shape in which the inside on the bottom portion 37 side is opened and the protruding skirt portion 2 side is closed. The protrusion amount t (FIG. 5) and width w (FIG. 2) of the protrusion 39 are variously set in accordance with the size of the color cathode ray tube.

As described above, by providing the protrusions 39 projecting in the direction opposite to the tube axis direction on the long side of the press-molded mask frame 36 in total, four places, the heat during the manufacturing process of the color cathode ray tube is provided. In the process, a deformation action (deformation action due to elasticity of the press-molded mask frame 36 itself) that the side wall section 34 is heated and the angle θ3 formed by the bottom face section 37 is made to expand from a desired angle is performed. The protrusion 39 protruding in the direction opposite to the tube axis can be suppressed by the deformation reinforcing action on the side wall 34.

As a result, in the conventional mask frame, the angle between the side wall and the bottom becomes larger than a desired angle in the heating process during the manufacturing process of the color cathode ray tube.
According to the configuration of the first embodiment, the expansion of the mask frame 36 is suppressed, and the deformation of the shadow mask main body 30 is prevented. The occurrence of deviation in beam landing can be effectively suppressed, and the color purity of the color image on the phosphor screen 13 can be prevented from deteriorating.

(Embodiment 2) Next, Embodiment 2 of the present invention will be described with reference to FIGS. In the second embodiment, the same elements as those of the color cathode ray tube of the first embodiment are denoted by the same reference numerals.

In the case of the color cathode ray tube of the second embodiment,
Instead of the configuration of the mask frame 36 of the color cathode ray tube according to the first embodiment, as shown in FIGS. 6 to 8, a region of the bent portion 38b between the short side wall portion 34b and the bottom portion 37 of the mask frame 36A. In addition, a protruding portion 39b protruding in a direction opposite to the bottom surface portion 37 extending in the tube axis direction is additionally provided.

That is, two locations are arranged on one short side on both sides of the horizontal axis (X axis) passing through the tube axis, and on the other short side, both sides of the horizontal axis (X axis) passing through the tube axis. In two places,
A total of four protrusions 39b are formed. The shape of each of the protrusions 39b is the same as the shape of the protrusion 39.

The protrusion amount and width of each of the short side protrusions 39b are variously set in accordance with the size of the color cathode ray tube as in the case of the protrusions 39.

According to the configuration of the second embodiment, a total of four protrusions 39b are formed on the short side as well as on the long side of the mask frame 36A. Therefore,
On each of the long side and the short side of the mask frame 36A, a deformation reinforcing effect is exerted by the projections 39 and the projections 39b, whereby the mask frame 36A is heated in the heating process in the manufacturing process of the color cathode ray tube. The expansion of the side wall portion 34 is suppressed over both the long side and the short side,
The deformation of the shadow mask main body 30 is further prevented than in the case of the first embodiment, and the occurrence of the deviation of the landing of the electron beam is suppressed more effectively, so that the color purity deterioration of the color image on the phosphor screen 13 is reduced. Can be prevented.

FIG. 9 shows a modification of the first embodiment, and FIG. 10 shows a modification of the second embodiment.

A modification of the first embodiment shown in FIG.
Instead of the mask frame 36 shown in FIG. 3, a mask frame 36 having a substantially rectangular parallelepiped projecting portion 39c formed over a range including a vertical axis passing through a pair of long side tube axes.
B is adopted, and the configuration of each element constituting the other color cathode ray tube is the same as that of the first embodiment.

Also in the configuration using the mask frame 36B having the protruding portion 39c formed on the long side as in the case of the first embodiment, the expansion of the mask frame 36B is suppressed, and the shadow mask body 30 Deformation is prevented, and it is possible to effectively suppress the occurrence of deviation of the landing of the electron beam, thereby preventing the color purity of the color image on the phosphor screen 13 from deteriorating.

FIG. 10 shows a modification of the second embodiment.
Instead of the mask frame 36A shown in FIG. 6, a substantially rectangular parallelepiped shape is respectively set in a range including a vertical axis passing through a pair of long side tube axes and a range including a horizontal axis passing through a pair of short side tube axes. The present embodiment employs a mask frame 36C formed with a projecting portion 39c and a projecting portion 39d. The other components of the color cathode ray tube are the same as those in the second embodiment.

Each of the protruding portions 3 is provided on the long side and the short side as described above.
Also in the configuration using the mask frame 36C in which the 9c and 39d are formed, similarly to the case of the second embodiment, the expansion of both the long side and the short side of the mask frame 36C is suppressed,
The deformation of the shadow mask main body 30 is further prevented, and it is possible to effectively prevent the deviation of the landing of the electron beam from occurring, thereby preventing the color purity of the color image on the phosphor screen 13 from deteriorating.

[0059]

According to the first and second aspects of the present invention, the opening angle of the side wall of the mask frame is prevented from becoming larger than a desired angle while preventing the mechanical strength of the mask frame from decreasing.
A color cathode ray tube can be provided which does not cause deformation of the shadow mask main body and can suppress occurrence of deviation in landing of an electron beam.

According to the third aspect of the present invention, it is possible to prevent the deformation of the electron beam landing without causing the deformation of the shadow mask main body having a large long side such as the aspect ratio of 16: 9. A color cathode ray tube that can be provided.

According to the fourth and fifth aspects of the present invention, similarly to the third aspect of the present invention, particularly, the aspect ratio is 1
It is possible to provide a color cathode ray tube capable of suppressing deformation of an electron beam landing without causing deformation of a shadow mask main body having a long side dimension such as 6: 9.

According to the sixth to eighth aspects of the present invention, it is possible to provide a color cathode ray tube which does not cause the entire deformation of the shadow mask main body and can more reliably suppress the deviation of the landing of the electron beam.

[Brief description of the drawings]

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

FIG. 2 is a plan view showing the configuration of a mask frame and a shadow mask of the color cathode ray tube according to the first embodiment of the present invention, partially cut away;

FIG. 3 is a sectional view in the Y-axis direction showing a configuration of a mask frame including a projection of the color cathode ray tube and a shadow mask according to the first embodiment of the present invention;

FIG. 4 is a cross-sectional view in the X-axis direction showing a configuration of a mask frame including a projection of the color cathode ray tube and a shadow mask according to the first embodiment of the present invention.

FIG. 5 is a sectional view taken along line AA of FIG. 2;

FIG. 6 is a plan view of a mask frame and a shadow mask of a color cathode ray tube according to a second embodiment of the present invention, partially cut away.

FIG. 7 is a cross-sectional view in the Y-axis direction showing the configuration of a mask frame including a projection of a color cathode ray tube and a shadow mask according to a second embodiment of the present invention.

FIG. 8 is a cross-sectional view in the X-axis direction showing a configuration of a mask frame including a projection of a color cathode ray tube and a shadow mask according to a second embodiment of the present invention.

FIG. 9 is a plan view showing a modification of the first embodiment of the present invention.

FIG. 10 is a plan view showing a modification of the second embodiment of the present invention.

FIG. 11 is a schematic sectional view showing a configuration of a conventional color cathode ray tube.

FIG. 12 is a partially cutaway plan view showing a configuration of a mask frame and a shadow mask of a conventional color cathode ray tube.

FIG. 13 is a cross-sectional view showing a configuration of a mask frame and a shadow mask in a conventional color cathode ray tube.

FIG. 14 is an explanatory diagram showing a state in which an electron beam emitted from an electron gun reaches a phosphor screen via a shadow mask.

FIG. 15 is a plan view showing the configuration of a mask frame provided with a bead projecting inward and a shadow mask in a conventional color cathode ray tube.

16 is a sectional view taken along line CC of FIG.

FIG. 17 is a cross-sectional view showing a conventional mask frame in which a projection is provided on the mask frame.

18 is a sectional view taken along line BB of FIG.

FIG. 19 is a sectional view taken along line α-α of FIG. 17;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Effective surface 2 Skirt part 3 Panel 4 Funnel 5 neck 6 Electron gun 7R, 7G, 7B Electron beam 8 Deflection device 13 Phosphor screen 19 Elastic support 30 Shadow mask main body 31 Main surface part 32 Skirt part 33a Electron beam passage hole 34 Side wall Portion 34b Short side wall portion 36 Mask frame 36A Mask frame 36B Mask frame 36C Mask frame 37 Bottom portion 38 Bend portion 38b Bend portion 39 Projection portion 39b Projection portion 39c Projection portion 39d Projection portion

Claims (8)

[Claims] 1. A shadow mask having a substantially rectangular mask skirt portion is disposed to face a phosphor screen formed on an inner surface of a substantially rectangular panel, and the shadow mask has a surface facing the phosphor screen. , A substantially rectangular shadow mask body having a large number of electron beam passage holes formed therein, and a substantially rectangular frame attached to the periphery of the shadow mask body, extending along the tube axis direction and extending along the tube axis direction. A mask frame having a bottom portion, one end of which is attached to an outer periphery of a side wall portion of the mask frame, and the other end is locked by a support pin provided on an inner periphery of the panel to support the mask frame and the shadow mask main body; In a color cathode ray tube having a plurality of elastic supports, a projection is formed in a boundary region between a side wall and a bottom of the mask frame in a direction opposite to the bottom. A color cathode ray tube characterized by having a protruding portion for projecting. 2. A shadow mask having a substantially rectangular mask skirt portion is disposed opposite to a phosphor screen formed on an inner surface of a substantially rectangular panel, and the shadow mask has a surface facing the phosphor screen. , A substantially rectangular shadow mask body having a large number of electron beam passage holes formed therein, and a substantially rectangular frame attached to the periphery of the shadow mask body, extending along the tube axis direction and extending along the tube axis direction. A mask frame having a bottom surface molded; one end attached to an outer periphery of a side wall of the mask frame; and the other end locked to a support pin provided on an inner periphery of the panel, so that the mask frame and the shadow mask main body are formed. In a color cathode ray tube having a plurality of elastic supports for supporting, in the boundary region between the side wall portion and the bottom portion of the mask frame,
A color cathode ray tube provided with a projection projecting in a direction opposite to the bottom surface and generating a suppressing force for suppressing expansion deformation of the side wall caused by heat applied to the mask frame to the bottom surface. 3. A projecting portion projecting in a direction opposite to a bottom surface of the mask frame is provided at least in a boundary region between a pair of long side walls and a bottom surface of the mask frame. The color cathode ray tube according to claim 1 or 2, wherein 4. A projecting portion projecting in a direction opposite to a bottom surface of the mask frame, at least in a boundary region between the pair of long side walls and the bottom surface of the mask frame.
3. The color cathode ray tube according to claim 1, wherein the color cathode ray tube is provided in a divided arrangement with a vertical axis passing through the tube axis interposed therebetween. 5. A projecting portion projecting in a direction opposite to a bottom portion of the mask frame, at least in a boundary region between the pair of long side walls and the bottom portion of the mask frame.
The color cathode ray tube according to claim 1 or 2, wherein the color cathode ray tube is provided in an arrangement including a portion through which a vertical axis passing through the tube axis passes. 6. A projecting portion projecting in a direction opposite to a bottom surface of the mask frame is provided at a boundary region between the pair of long side walls and the bottom surface of the mask frame and a pair of short side walls. 3. The color cathode ray tube according to claim 1, wherein the color cathode ray tube is provided in a boundary region between the portion and the bottom portion. 7. A protruding portion projecting in a direction opposite to a bottom portion of the mask frame is divided into a vertical axis passing through a long side tube axis and a horizontal axis passing through a short side tube axis. 7. The color cathode ray tube according to claim 6, wherein the color cathode ray tube is provided. 8. A projection projecting in a direction opposite to a bottom surface of the mask frame, the projection including a portion passing through a vertical axis passing through a long side tube axis and a horizontal axis passing through a short side tube axis. 7. The color cathode ray tube according to claim 6, wherein each of said color cathode ray tubes is provided.