JP2002319353A - Shadow mask structure and color cathode-ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem that a contact area is small and conversion efficiency of vibration energy is low because a shadow mask contacts a vibration absorber on a single line in a conventional shadow mask structure and hence the number of the vibration absorbers is increased and the mass of the vibration absorber is increased in order to compensate it, causing easy deformation and increase in cost of the shadow mask. SOLUTION: In this shadow mask structure 10, the shadow mask 14 is brought into two or more multi-line contact or surface contact with the vibration absorber 15. Since the contact area of the shadow mask 14 with the vibration absorber 15 is increased, the conversion efficiency of the vibration energy is enhanced. Thereby, the vibration of the shadow mask 14 is rapidly terminated, and color purity degradation due to the vibration of the shadow mask 14 can be immediately eliminated.

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 Color cathode ray tubes (flat tubes) having a flat glass panel surface have been increasing in recent years. However, the glass panel has a flat surface but a cylindrical inner surface. The shadow mask is also made on the cylindrical surface.

FIG. 9 is a perspective view showing an example of a conventional shadow mask structure 90 of a 19-inch flat color CRT.
This example is an example in a shadow mask structure filed by the present applicant as Japanese Patent Application No. 11-339834. The mask frame 91 has a pair of long sides 92 and a pair of short sides 93 combined to form a substantially rectangular frame.
mm, short side 270 mm, height 40 mm. Broken line 94
Is a boundary between a perforated portion and a non-perforated portion of the shadow mask 95.

[0004] The shadow mask 95 is approximately 280 m long.
m, width is almost 370mm, thickness is 0.1m
m, the rigidity is low and sufficient tension is not applied near the short side. Therefore, when external vibration from a speaker or the like is transmitted to the shadow mask 95, the vicinity of the short side resonates,
Since the distance (Q value) between the glass panel and the shadow mask 95 fluctuates, the color purity decreases.

In a conventional shadow mask structure 90, a pin-shaped vibration absorber 96 having flanges at both ends is loosely attached to a short side of a shadow mask 95. The vibration energy of the shadow mask 95 is lost due to friction between the vibration absorber 96 and the shadow mask 95, and the shadow mask 95
Vibration can be attenuated.

[0006]

FIG. 10 shows a horizontal sectional view and a vertical sectional view of the vicinity of a vibration absorber 96 of a conventional shadow mask structure 90. As shown in FIG. As shown in FIG.
5. A circular hole 97 having a radius R1 = 0.9 mm, for example, on the short side.
And a cylindrical vibration absorber 96 having a radius R2 = 0.5 mm, for example, is attached to the hole 97 (the flanges 9 at both ends).
8 is, for example, a disk having a radius of 1.75 mm). Therefore, the contact point between the inner surface of the hole 97 of the shadow mask 95 and the vibration absorber 96 is determined by the inner tangent (1
On this line, the shadow mask 95 and the vibration absorber 96 cause friction to convert vibration energy into heat energy.

The problem with the conventional shadow mask structure 90 is that the contact between the shadow mask 95 and the vibration absorber 96 is a single line, so that the contact area is small and the conversion efficiency of vibration energy is low. To compensate for this, conventionally, the number of vibration absorbers 96 has been increased or the mass has been increased. However, this causes a problem that the shadow mask 95 is easily deformed and the cost is increased.

It is an object of the present invention to increase the contact area between the shadow mask 95 and the vibration absorber 96 without changing the basic structure of the conventional shadow mask structure 90, and to increase the conversion efficiency of vibration energy.

[0009]

In order to solve the above-mentioned problems, in the shadow mask structure according to the present invention, the shadow mask and the vibration absorber are brought into two or more multi-line contact or surface contact. By doing so, the contact area between the shadow mask and the vibration absorber increases, so that the conversion efficiency of vibration energy increases. As a result, the vibration of the shadow mask quickly converges, and a decrease in color purity due to the vibration of the shadow mask can be quickly eliminated.

According to the first aspect of the present invention, a substantially rectangular frame-shaped mask frame including a pair of long sides and a pair of short sides, and a substantially rectangular shadow mask whose long sides are fixed to the mask frame. In the shadow mask structure, a mounting hole and a vibration absorber loosely locked in the mounting hole are provided in the non-porous portion on the short side of the shadow mask, and the inner surface of the mounting hole and the vibration absorber are A shadow mask structure characterized by two or more multi-line contacts or surface contacts.

According to a second aspect of the present invention, in the shadow mask structure of the first aspect, a material of the short side of the mask frame is 13 chrome stainless steel, and a material of the long side of the mask frame and the material of the shadow mask are invar alloy. Wherein the material of the vibration absorber is 18-8 stainless steel.

According to a third aspect of the present invention, there is provided a shadow mask structure comprising a substantially rectangular frame-shaped mask frame having a pair of long sides and a pair of short sides, and a substantially rectangular shadow mask. A support having a long side of the shadow mask fixed to the mask support, a short side non-porous portion of the shadow mask, a mounting hole, and a vibration absorber loosely locked in the mounting hole. Having the inner surface of the mounting hole and the vibration absorber,
A shadow mask structure characterized by two or more multi-line contacts or surface contacts.

According to a fourth aspect of the present invention, in the shadow mask structure of the third aspect, the material of the mask frame is 13 chrome stainless steel, and the material of the mask support and the shadow mask is an invar alloy. A shadow mask structure wherein the material of the vibration absorber is 18-8 stainless steel.

The invention described in claim 5 is the first invention.
A color CRT equipped with any one of the shadow mask structures according to Item 4.

[0015]

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 size is 360 m long side.
m, short side is 270 mm, and height is 40 mm. As shown in the figure, the mask frame 11 has a substantially rectangular frame shape by combining a pair of long sides 12 and a pair of short sides 13. The shadow mask 14 is seam-welded to the upper end surface of the long side 12 of the mask frame. The long side 12 of the mask frame has a thickness of 2.
The mask frame short side 13 is 2 mm thick Invar alloy and 13 mm chrome stainless steel with a thickness of 2.2 mm. The vibration absorber 15 has 4 × 2 =
Eight are attached.

FIG. 2 shows a horizontal sectional view and a vertical sectional view of the vicinity of the vibration absorber 15 of the shadow mask structure 10 of the present invention.
As shown in the figure, a circular hole 21 having a radius R1 = 0.9 mm, for example, is made in the short side of the shadow mask 14, and
A pseudo-cylindrical vibration absorber 15 part of which is a circular arc having a radius R2 = R1 = 0.9 mm is attached (the flanges 16 at both ends are, for example, disks having a radius of 1.75 mm). Therefore, the contact between the inner surface of the hole 21 of the shadow mask 14 and the vibration absorber 15 is a part of the surface of a cylinder having a radius R1. On this surface, the shadow mask 14 and the vibration absorber 15 frictionally generate vibration energy into heat energy. Convert.

In the shadow mask structure 10 of the present invention, the contact portion between the shadow mask 14 and the vibration absorber 15 is the same as the conventional one.
The area of contact increased because of the transition from the book line to the surface. For this reason, the conversion efficiency of vibration energy increases, and the vibration of the shadow mask 14 quickly converges. In this manner, a decrease in color purity due to the vibration of the shadow mask 14 can be quickly eliminated.

There are many variations of the combination of the hole of the shadow mask 14 and the shape of the vibration absorber as described below. The basic principle is to make the contact area between the hole of the shadow mask 14 and the vibration absorber larger than before. In the following description of the modified example, the perspective view of the shadow mask structure is omitted because it is the same as that of the first embodiment, and only a horizontal sectional view near the vibration absorber is shown.

FIG. 3 shows an example in which the radius R2 of the pseudo columnar vibration absorber 32 is larger than the radius R1 of the hole 31 on the short side of the shadow mask 14. R1 and R2 are, for example, 0.9 mm,
1.5 mm. In this case, two places (2
The vibration absorber 32 is in contact with the two lines.

FIG. 4 shows an example in which the hole 41 of the shadow mask 14 is circular and the vibration absorber 42 is a triangular prism. Also in this case, the vibration absorber 42 is in contact with the two inner surfaces (two lines) of the hole 41.

FIG. 5 shows an example in which the hole 51 of the shadow mask 14 is circular and the vibration absorber 52 is a square pole. Also in this case, the vibration absorber 52 is in contact with two places (two lines) on the inner surface of the hole 51.

FIG. 6 shows an example in which the hole 61 of the shadow mask 14 is square and the vibration absorber 62 is a cylinder. Also in this case, the vibration absorber 62 is in contact with two inner surfaces (two lines) of the hole 61.

FIG. 7 shows an example in which the hole 71 of the shadow mask 14 is square and the vibration absorber 72 is also a square pole. In this case, the vibration absorber 72 is in contact with the two surfaces of the hole 71.

FIG. 8 is a perspective view of a second embodiment 80 of the shadow mask structure of the present invention. This is the first embodiment of FIG.
This embodiment is the same as the first embodiment except that the mask support 81 and the material of the mask frame long side 82 are added to the configuration of FIG. The center portion 81A of the mask support 81 is welded to the long side 82 of the mask frame. The shadow mask 83 is seam-welded to the upper end surface of the mask support 81. The material of the long side 82 of the mask frame is the same 13-chrome stainless steel as the short side 84, and the material of the mask support 81 is the same invar alloy as the shadow mask 83. By fixing the shadow mask 83 to the mask support 81 instead of the mask frame long side 82 in this way,
The thermal expansion coefficient of the long side 82 of the mask frame
There is no need to match with 3. As a result, a material having low mechanical properties such as 13 chrome stainless steel, which is the same as the short side 84 of the mask frame, can be used for the long side 82 of the mask frame. Therefore, the second embodiment 80 is much cheaper and has better performance than the first embodiment 10 even if the cost increase due to the addition of the mask support 81 is considered.

In the second embodiment 80 of the shadow mask structure of the present invention, the vibration absorber 85 is
4 × 2 = 8 pieces are attached to the non-porous portion on the short side. The detailed relationship between the hole of the shadow mask 83 and the vibration absorber 85, the modification, and the operation and effect are the same as in the case of the first embodiment 10, and therefore the description is omitted.

[0026]

According to the shadow mask structure of the present invention, the shadow mask and the vibration absorber are brought into contact with two or more polylines or surfaces. By doing so, the contact area between the shadow mask and the vibration absorber increases, so that the conversion efficiency of vibration energy increases. Therefore, the vibration of the shadow mask quickly converges, and a decrease in color purity due to the vibration of the shadow mask can be quickly eliminated.

Since the contact area between the vibration absorber and the shadow mask is large, the number of vibration absorbers can be reduced, and the mass of the vibration absorber can be reduced. Therefore, deformation of the shadow mask hardly occurs, and the cost is reduced.

The color cathode ray tube equipped with the shadow mask structure according to the present invention has an advantage that even if external vibrations of a speaker or the like are transmitted to the shadow mask and resonate, the vibrations are rapidly attenuated, so that a decrease in color purity due to the vibrations is not easily recognized. There is.

[Brief description of the drawings]

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

FIG. 2 is a horizontal and vertical sectional view of the vicinity of a vibration absorber of a first embodiment of the shadow mask structure of the present invention.

FIG. 3 is a horizontal sectional view showing the vicinity of a vibration absorber of the first embodiment of the shadow mask structure according to the present invention;

FIG. 4 is a horizontal sectional view showing the vicinity of a vibration absorber of the first embodiment of the shadow mask structure of the present invention.

FIG. 5 is a horizontal sectional view showing the vicinity of a vibration absorber of the first embodiment of the shadow mask structure according to the present invention;

FIG. 6 is a horizontal sectional view showing the vicinity of a vibration absorber of the first embodiment of the shadow mask structure of the present invention.

FIG. 7 is a horizontal sectional view showing the vicinity of a vibration absorber of the first embodiment of the shadow mask structure according to the present invention;

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

FIG. 9 is a perspective view of a conventional shadow mask structure.

FIG. 10 is a horizontal and vertical sectional view of the vicinity of a vibration absorber of a conventional shadow mask structure.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 shadow mask structure 11 mask frame 12 mask frame long side 13 mask frame short side 14 shadow mask 15 vibration absorber 16 brim at both ends 21 hole 31 hole 32 vibration absorber 41 hole 42 vibration absorber 51 hole 52 vibration absorber 61 hole 62 Vibration absorber 71 Hole 72 Vibration absorber 80 Shadow mask structure 81 Mask support 81A Welded portion 82 Mask frame long side 83 Shadow mask 84 Mask frame short side 85 Vibration absorber 90 Shadow mask structure 91 Mask frame 92 Mask frame long side 93 Short side of mask frame 94 Boundary between perforated portion and non-perforated portion 95 Shadow mask 96 Vibration absorber 97 Hole 98 Brim at both ends

Claims (5)

[Claims] 1. A shadow mask structure comprising a substantially rectangular frame-shaped mask frame having a pair of long sides and a pair of short sides, and a substantially rectangular shadow mask having the long sides fixed to the mask frame. A mounting hole and a vibration absorber loosely locked in the mounting hole are provided on the short side non-porous portion of the shadow mask, and the inner surface of the mounting hole and the vibration absorber are two or more. A shadow mask structure having a line contact or a surface contact. 2. The shadow mask structure according to claim 1, wherein the material of the short side of the mask frame is 13 chrome stainless steel, the long side of the mask frame and the material of the shadow mask are an Invar alloy, and the vibration absorption is performed. A shadow mask structure wherein the body material is 18-8 stainless steel. 3. A shadow mask structure comprising a substantially rectangular frame-shaped mask frame comprising a pair of long sides and a pair of short sides, and a substantially rectangular shadow mask, comprising a mask support on the long side of the mask frame. The long side of the shadow mask is fixed to the mask support, and a short side non-porous portion of the shadow mask has a mounting hole and a vibration absorber loosely locked in the mounting hole. A shadow mask assembly, wherein two or more multi-line or surface contacts are made between the inner surface of the hole and the vibration absorber. 4. The shadow mask structure according to claim 3, wherein said mask frame is made of 13 chrome stainless steel, said mask support and said shadow mask are made of Invar alloy, and said vibration absorber is made of material. 18
-8 A shadow mask structure characterized by being stainless steel. 5. A color CRT equipped with any of the shadow mask structures according to claim 1.