JP2002373598A - Shadow mask structural body and color cathode-ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To transmit vibration energy of a shadow mask rapidly to vibration absorbers of right and left ends of the shadow mask by making tension distribution of the shadow mask higher at the center and lower at the right and left ends, so that the vibration of the shadow mask is relieved in a short time. SOLUTION: In the shadow mask structural body 10, deflection strength of the longer side 11 of the mask frame is made maximum at the center and weaker to the right and left ends. By this, because the tension distribution of the shadow mask 14 is made higher at the center and lower at the right and left ends so that the vibration energy of the shadow mask is rapidly transmitted to the vibration absorbers 16 of the right and left ends, the vibration of the shadow mask is relieved in a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a color CRT shadow mask structure and a color CRT mounting the same.

[0002]

2. Description of the Related Art FIG. 10 is a perspective view of a first example 100 of a conventional shadow mask structure. In this example, the applicant has filed
This is a shadow mask structure filed as No. 1-339834. In order to clearly understand the structure of the shadow mask structure 100, only the periphery of the shadow mask 101 is indicated by a two-dot chain line, and the vibration absorber 106 is indicated by a broken line. A first example of a conventional shadow mask structure 100 is for a flat screen color cathode ray tube, and has a pair of long sides 102 and a pair of short sides 1.
03 has a frame-shaped mask frame combined,
A mask support 104 is fixed to the long side 102 of the mask frame. The long side of the shadow mask 101 is seam-welded to the upper end surface of the mask support 104, whereby a tension parallel to the short side of the shadow mask 101 is applied to the shadow mask 101.

FIG. 11 is a plan view of a shadow mask 101,
FIG. As shown in the figure, a large number of substantially rectangular electron beam passage holes 101A are arranged in a vertical direction to form a column, and a large number of columns are arranged in a horizontal direction. The adjacent columns are vertically shifted by a half pitch of the electron beam passage hole 101A. The vibration energy of the shadow mask 101, which will be described later, is applied to the bridge
01B, it is transmitted to the short side (left and right sides) of the shadow mask 101, and is consumed by friction between the vibration absorber 106 and the shadow mask 101 loosely attached to the short side of the shadow mask 101. Thus, the shadow mask 1
The vibration of 01 is damped.

FIG. 12 is a perspective view of a second example 120 of a conventional shadow mask structure. A second example 120 of a conventional shadow mask structure is for a flat screen color CRT, and has a mask frame including a pair of long sides 121 and a pair of arms 122. The long side of the shadow mask 123 is seam-welded to the upper end surface of the long side 121 of the mask frame,
Thus, a tension parallel to the short side of the shadow mask 123 is applied to the shadow mask 123. The structure and function of the shadow mask 123 and the vibration absorber 124 are the same as those of the shadow mask 10 of the first example 100 of the conventional shadow mask structure.
1. Same as the vibration absorber 106.

[0005]

FIG. 13 shows a shadow mask 10 of a first example 100 of a conventional shadow mask structure.
3 shows the distribution of the tension 105 of the shadow mask 101 along one long side. As shown in the drawing, the tension 105 is the lowest at the center O of the shadow mask and the highest at the left and right ends H ′ and H. The reason is that the bending strength of the long side 102 of the mask frame is weak at the center and strong at the left and right ends.

[0006] As described above, the tension 105 is applied to the shadow mask 1.
If it is low at the center of 01 and high at the left and right, there is a problem that the vibration of the shadow mask 101 generated by the resonance of the speaker or the like is not attenuated for a long time. The reason is that the vibration energy is likely to remain in the central portion of the shadow mask 101 having a low tension, and is difficult to be transmitted to the left and right end portions of the shadow mask 101 having a high tension. This is because it takes time. When the shadow mask 101 vibrates, the shadow mask 10
Since the distance (Q value) between 1 and the glass panel (not shown) fluctuates, the color purity decreases. Therefore, the shadow mask 10
It is desirable that the vibration of 1 be attenuated quickly.

When welding the shadow mask 101, if the central portion of the long side 102 of the mask frame is elastically deformed inward compared to the left and right ends, the tension is high at the center of the shadow mask 101, contrary to FIG. Lower at the edge. Therefore, the vibration of the shadow mask 101 can be rapidly attenuated, but this method is difficult to employ because the shadow mask 101 is likely to wrinkle.

A second example 120 of a conventional shadow mask structure
, The tension distribution is the same as the distribution of the tension 105 in the first example 100, and the shadow mask 1 is the same as in the first example 100.
There is a problem that the attenuation of the vibration of the 23 is slow.

An object of the present invention is to make the tension distribution of the shadow mask high at the center of the shadow mask and low at the left and right ends so that the vibration energy of the shadow mask is quickly transmitted to the vibration absorbers at the left and right ends of the shadow mask. The purpose is to reduce the vibration of the shadow mask in a short time. Another object of the present invention is to provide a color CRT in which the shadow mask vibrates in a short time even if it resonates with an external vibration of a speaker or the like by mounting such a shadow mask, and the color purity does not significantly decrease.

[0010]

In order to solve the above-mentioned problems, in the shadow mask structure of the present invention, the bending strength of the long side of the mask frame is maximum at the center and weakens toward the left and right ends. As a specific configuration for that,
(1) The width of the long side of the mask frame is maximum at the center of the long side of the mask frame and narrows toward the left and right ends. (2) The thickness of the long side of the mask frame is maximum at the center of the long side of the mask frame. (3) There are a plurality of grooves on the long side of the mask frame, no or few grooves near the center of the mask frame, and the number of grooves increases toward the left and right ends. is there.

According to the first aspect of the present invention, there is provided a frame-shaped mask frame including a pair of long sides and a pair of short sides, a mask support fixed to the long sides of the mask frame, and a mask support fixed to the mask support. In a shadow mask structure comprising a substantially rectangular shadow mask, a vibration absorber is provided on the short side of the shadow mask, and the bending strength of the long side of the mask frame is maximum at the center and weakens toward the left and right ends. A shadow mask structure.

According to a second aspect of the present invention, there is provided a shadow mask structure comprising a mask frame having a pair of long sides and a pair of arms, and a substantially rectangular shadow mask fixed to the long sides of the mask frame. A shadow mask structure, wherein a vibration absorber is provided on a short side, and a bending strength of a long side of the mask frame is maximum at a center and weakens toward left and right ends.

According to a third aspect of the present invention, in the shadow mask structure according to the first or second aspect, the width of the long side of the mask frame is maximum at the center of the long side of the mask frame and narrows toward the left and right ends. A shadow mask structure characterized by the following.

According to a fourth aspect of the present invention, in the shadow mask structure according to the first or second aspect, the thickness of the long side of the mask frame is maximum at the center of the long side of the mask frame.
This is a shadow mask structure characterized in that it is thinner toward the left and right ends.

According to a fifth aspect of the present invention, in the shadow mask structure of the first or second aspect, there are a plurality of grooves on the long side of the mask frame, and there is no groove near the center of the long side of the mask frame. A shadow mask structure characterized in that the number of the grooves is small and the number of the grooves is large toward the left and right ends.

The invention described in claim 6 is the first invention.
A color CRT equipped with any one of the shadow mask structures according to Item 5.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a shadow mask structure according to the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a first embodiment 10 of the shadow mask structure of the present invention. The first embodiment 10 of the shadow mask structure of the present invention is for a 19-inch flat color cathode-ray tube, and its approximate dimensions are 360 mm on a long side, 270 mm on a short side, and 40 mm in height. The mask frame has a frame shape in which a pair of long sides 11 and a pair of short sides 12 are combined. A mask support 13 is provided on the long side 11 of the mask frame.
Is fixed only at the center. The shadow mask 14 is seam-welded to the upper end surface of the mask support 13. The structure of the shadow mask 14 is the same as that of the conventional shadow mask structure 10.
0 is the same as the shadow mask 101. A vibration absorber 16 is loosely attached to the short side of the shadow mask 14. In order to clearly understand the structure of the shadow mask structure 10, only the periphery of the shadow mask 14 is indicated by a two-dot chain line.
The vibration absorber 16 is indicated by a broken line.

The mask frame long side 11 and the mask frame short side 12 are 2.2 mm thick 13 chrome stainless steel,
The mask support 13 is an Invar alloy having a thickness of 3 mm and a width of 20 mm, the shadow mask is an Invar alloy having a thickness of 0.1 mm, and the vibration absorber 16 has a disk at both ends having a diameter of 3.5 mm, a mandrel having a diameter of 1 mm and a length of 5 mm. 18-8 stainless steel.

The feature of the first embodiment 10 of the shadow mask structure of the present invention is that the lower side 11A of the long side 11 of the mask frame has an arc shape which is wide at the center and narrow at the left and right ends. (First Example of Conventional Shadow Mask Structure 1
00, the lower side 102A of the mask frame long side 102
Was a rectangle of uniform width. As a result, the bending strength of the long side 11 of the mask frame is maximum at the center and weaker toward the left and right ends. As a result, as shown in FIG. 2, in the shadow mask structure according to the first embodiment 10 of the present invention, the tension of the shadow mask 14 along the long side of the shadow mask 14 is 1.
The distribution of No. 5 is highest at the center O of the shadow mask, and lowest at the left and right ends H 'and H.

As a result of such a distribution of the tension 15, in the first embodiment 10 of the shadow mask structure of the present invention, even when the vibration of the speaker is transmitted to the shadow mask 14 and the shadow mask 14 resonates, the shadow mask 14 The vibration energy of 14 is easily transmitted to the left and right ends (vibration absorbers 16) of which the tension 15 is weaker. Therefore, the vibration energy of the shadow mask 14 is quickly lost due to the friction between the vibration absorber 16 and the shadow mask 14, and the vibration stops in a short time. As a result, the decrease in the color purity of the screen of the color cathode-ray tube does not have to be noticeable.

FIG. 3 is a perspective view of a second embodiment 20 of the shadow mask structure of the present invention. The difference from the first embodiment is that the lower side 21A of the long side 21 of the mask frame is a symmetrical pentagon whose width is wide at the center and narrows toward the left and right ends. The change in the tension distribution of the shadow mask, the effect of vibration propagation, and the effect of preventing a decrease in color purity are the same as in the first embodiment 10 of the shadow mask structure according to the present invention, and a description thereof will be omitted.

FIG. 4 is a perspective view of a third embodiment 30 of the shadow mask structure of the present invention. The lower side 31A of the mask frame long side 31 is a first example 100 of a conventional shadow mask structure.
The width of the upper side 31B is the same at the center of the long side 31 of the mask frame, and becomes thinner toward the left and right ends. As a result, the bending strength of the long side 31 of the mask frame is maximum at the center and weakens toward the left and right ends.
The change in the tension distribution of the shadow mask, the effect of vibration propagation, and the effect of preventing a decrease in color purity are the same as in the first embodiment 10 of the shadow mask structure according to the present invention, and a description thereof will be omitted.

FIG. 5 is a perspective view of a fourth embodiment 40 of the shadow mask structure of the present invention. The width and thickness of the long side 41 of the mask frame are the same as those of the first example 100 of the conventional shadow mask structure, but a plurality of grooves 42 are formed in the upper side 41B. The groove 42 is not located at the center of the long side 41 of the mask frame, but gradually increases from one to three as approaching the left and right ends. Due to the groove 42, the bending strength of the long side 41 of the mask frame is maximum at the center and weaker toward the left and right ends. The change in the tension distribution of the shadow mask, the effect of vibration propagation, and the effect of preventing a decrease in color purity are the same as in the first embodiment 10 of the shadow mask structure according to the present invention, and a description thereof will be omitted.

FIG. 6 is a perspective view of a fifth embodiment 50 of the shadow mask structure of the present invention. The fifth embodiment 50 of the shadow mask structure of the present invention is for a 19-inch flat color cathode-ray tube, and its general dimensions are 360 mm on a long side, 270 mm on a short side, and 80 mm in height. The mask frame is formed by combining a pair of long sides 51 and a pair of arms 52. The shadow mask 53 is seam-welded to the upper end surface of the long side 51 of the mask frame. The structure of the shadow mask 53 is the same as the shadow mask 123 of the second example 120 of the conventional shadow mask structure.

A feature of the fifth embodiment 50 of the shadow mask structure of the present invention is that the lower side 51A of the long side 51 of the mask frame has an arc shape which is wide at the center and narrow at the left and right ends. As a result, the bending strength of the long side 51 of the mask frame is maximum at the center and weaker toward the left and right ends. As a result, the tension distribution of the shadow mask 53 is the highest at the center of the shadow mask and the lowest at the left and right ends, as shown in FIG. The change in the tension distribution of the shadow mask, the effect of vibration propagation, and the effect of preventing a decrease in color purity are the same as in the first embodiment 10 of the shadow mask structure according to the present invention, and a description thereof will be omitted.

FIG. 7 is a perspective view of a sixth embodiment 60 of the shadow mask structure of the present invention. The difference from the fifth embodiment 50 of the shadow mask structure of the present invention described above is that the lower side 61A of the long side 61 of the mask frame is a symmetrical pentagon whose width is wide at the center and narrows toward the left and right ends. . The change in the tension distribution of the shadow mask, the effect of vibration propagation, and the effect of preventing the color purity from being reduced are the same as those of the fifth embodiment of the shadow mask structure of the present invention.

FIG. 8 is a perspective view of a seventh embodiment 70 of the shadow mask structure of the present invention. The lower side 71A of the mask frame long side 71 is the second example 120 of the conventional shadow mask structure.
The width of the upper side 71B is thicker at the center of the longer side 71 of the mask frame and thinner toward the left and right ends. As a result, the bending strength of the long side 71 of the mask frame is maximum at the center and weaker toward the left and right ends.
The change in the tension distribution of the shadow mask, the effect of vibration propagation, and the effect of preventing the color purity from being reduced are the same as those of the fifth embodiment of the shadow mask structure of the present invention.

FIG. 9 is a perspective view of an eighth embodiment 80 of the shadow mask structure of the present invention. The width and thickness of the long side 81 of the mask frame are the same as those of the second example 120 of the conventional shadow mask structure.
The same as above, but a plurality of grooves 82 are formed in the upper side 81B. The groove 82 is not located at the center of the long side 81 of the mask frame, but gradually increases from one to three as approaching the left and right ends. Due to the groove 82, the bending strength of the long side 81 of the mask frame is maximum at the center and weakens toward the left and right ends. The change in the tension distribution of the shadow mask, the effect of vibration propagation, and the effect of preventing the color purity from being reduced are the same as those of the fifth embodiment of the shadow mask structure of the present invention.

[0029]

According to the shadow mask structure of the present invention, the bending strength of the long side of the mask frame is maximum at the center and weakens toward the left and right ends. As a result, the tension distribution of the shadow mask is high at the center of the shadow mask and low at the left and right ends, and the vibration energy of the shadow mask is quickly transmitted to the vibration absorbers at the left and right ends of the shadow mask. Therefore, the vibration of the shadow mask can be settled in a short time. In addition, by mounting such a shadow mask, the vibration of the shadow mask can be settled in a short time even if there is an external vibration of a speaker or the like, thereby realizing a color cathode ray tube in which a decrease in color purity is not conspicuous.

[Brief description of the drawings]

FIG. 1 is a first embodiment of a shadow mask structure according to the present invention.
0 perspective view

FIG. 2 is a first embodiment of a shadow mask structure according to the present invention;
Illustration of tension distribution of 0

FIG. 3 is a second embodiment of the shadow mask structure of the present invention.
0 perspective view

FIG. 4 is a third embodiment of the shadow mask structure of the present invention.
0 perspective view

FIG. 5 is a fourth embodiment of the shadow mask structure of the present invention.
0 perspective view

FIG. 6 is a fifth embodiment 5 of the shadow mask structure of the present invention.
0 perspective view

FIG. 7 shows a sixth embodiment of the shadow mask structure of the present invention.
0 perspective view

FIG. 8 is a seventh embodiment of the shadow mask structure of the present invention.
0 perspective view

FIG. 9 shows an eighth embodiment of the shadow mask structure of the present invention.
0 perspective view

FIG. 10 shows a first example 100 of a conventional shadow mask structure.
Perspective view of

FIG. 11 shows a first example 100 of a conventional shadow mask structure.
Plan view and side view of the shadow mask 101 of FIG.

FIG. 12 shows a second example 120 of a conventional shadow mask structure.
Perspective view of

FIG. 13 shows a first example 100 of a conventional shadow mask structure.
Illustration of tension distribution of

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 First embodiment of shadow mask structure 11 Long side of mask frame 11A Lower side of long side of mask frame 12 Short side of mask frame 13 Mask support 14 Shadow mask 15 Tension 16 Vibration absorber 20 Second embodiment of shadow mask structure 21 Mask Frame long side 21A Lower side of mask frame long side 30 Third embodiment of shadow mask structure 31 Mask frame long side 31A Lower side of mask frame long side 31B Upper side of mask frame long side 40 Fourth embodiment of shadow mask structure 41 Mask frame Long side 41B Upper side of mask frame long side 42 Groove 50 Fifth embodiment of shadow mask structure 51 Mask frame long side 51A Lower side of mask frame long side 52 Arm 53 Shadow mask 60 Sixth embodiment of shadow mask structure 61 Mask frame length Side 61 A Lower side of long side of mask frame 70 Seventh embodiment of shadow mask structure 71 Long side of mask frame 71A Lower side of mask frame 71B Upper side of mask frame 80 Eighth embodiment of shadow mask structure 81 Long side of mask frame 81B Long side of mask frame Upper side 82 Groove 100 First example of conventional shadow mask structure 101 Shadow mask 102A Lower side of long side of mask frame 101A Electron beam passage hole 101B Bridge 102 Long side of mask frame 103 Short side of mask frame 104 Mask support 105 Tension 106 Vibration absorption Body 120 Second example of conventional shadow mask structure 121 Long side of mask frame 122 Arm 123 Shadow mask 124 Vibration absorber H ', H Shadow mask left and right ends O Shadow mask center

Claims (6)

[Claims] 1. A frame-shaped mask frame including a pair of long sides and a pair of short sides, a mask support fixed to the long sides of the mask frame, and a substantially rectangular shadow mask fixed to the mask support. In a shadow mask structure comprising: a vibration absorber is provided on a short side of the shadow mask, and a bending strength of a long side of the mask frame is
A shadow mask structure characterized in that it is largest at the center and weaker toward the left and right edges. 2. A shadow mask structure comprising a mask frame having a pair of long sides and a pair of arms, and a substantially rectangular shadow mask fixed to the long sides of the mask frame, wherein a vibration absorber is provided on a short side of the shadow mask. Is provided, and the bending strength of the long side of the mask frame,
A shadow mask structure characterized in that it is largest at the center and weaker toward the left and right edges. 3. The shadow mask structure according to claim 1, wherein the width of the long side of the mask frame is maximum at the center of the long side of the mask frame and narrows toward the left and right ends. Mask structure. 4. A shadow mask structure according to claim 1, wherein the thickness of the long side of the mask frame is maximum at the center of the long side of the mask frame and becomes thinner toward the left and right ends. Shadow mask structure. 5. A shadow mask structure according to claim 1, wherein said mask frame has a plurality of grooves on a long side thereof, and said groove is absent or small in number near a center of said long side of said mask frame. Wherein the number of the grooves increases toward. 6. A color CRT equipped with any one of the shadow mask structures according to claim 1.