KR20030093487A - Tension mask assembly - Google Patents

Abstract

PURPOSE: A tension mask assembly is provided to prevent an electron beam mis-landing and reduce vibrations by preventing the deformation of the mask. CONSTITUTION: A tension mask assembly(30) comprises a frame including a pair of support members(32) opposed each other and a pair of strength members(33) interposed between the support members; a tension mask(31) mounted on the support members in such a manner that the tension mask is applied with a tension force, wherein the tension mask has a plurality of slots(31a) for passage of electron beams; a support member(34) mounted on the frame in the direction of applying a tension force to the tension mask, wherein the support member has a coefficient of thermal expansion lower than that of the strength member so as to correct the thermal deformation of the tension mask caused due to the difference of thermal expansion rates of the tension mask and the frame; and a vibration reduction unit(300) arranged on the rear surface of the support member, and which reduces the vibration of the support member.

Description

Tension mask assembly

The present invention relates to a tension mask assembly, and more particularly, to a tension mask assembly having an improved structure for supporting a tension mask to which tension is applied.

In general, a cathode ray tube passes through a myriad of electron beam through holes formed in a mask having a color discrimination function and lands on a fluorescent film formed on an inner surface of a panel to excite each phosphor layer of the fluorescent film. Will be implemented.

The screen forming the image is designed to have curvature in accordance with the deflection trajectory of the electron beam deflected by the deflection yoke mounted on the cone portion of the funnel, and the mask provided inside the funnel is also formed to correspond to the curvature of the screen.

However, in the cathode ray tube employing such a mask, a so-called doming phenomenon occurs, in which the mask is heated by the electron beam emitted from the electron gun and swells to the panel side. This doming phenomenon causes the electron beam to fail to land correctly on each phosphor layer of the desired fluorescent film. In addition, as the screen is formed to have a predetermined curvature, the viewing angle is narrowed, and a phenomenon in which an image is distorted occurs at the periphery of the screen.

In order to solve this problem, a flat cathode ray tube having a flat screen has been developed. In the planar cathode ray tube, a tension mask assembly is fixedly installed in a state in which tension is applied to the inside of the panel.

1 illustrates a tension mask assembly 10 as disclosed in US Pat. No. 5,111,107.

Referring to the drawings, the tension mask assembly 10 has a plurality of support members 11 which are installed to correspond to each other, and a plurality of elastic forces which are installed below the support member 11 to support the support member 11. Two rigid members 12 and a mask 13 installed on an upper surface of the support member 11.

The structure of the tension mask assembly 10 as described above removes the stress caused by welding of the support member 11 and the rigid member 12 during the manufacturing process, the support member 11, the rigid member 12, the mask In order to blacken (13), the burning and blackening process is performed at a temperature near 500 ° C. In this case, the mask 13 may be plastically deformed or creep strain due to a difference in mutual thermal expansion of the metal materials 11 to 13 and a decrease in yield point due to temperature rise. This will occur. Accordingly, the mask 13 is reduced by about 20% in the tensile force during the heat treatment.

This is due to the difference in the amount of thermal expansion of the metal materials 11 to 13, and the difference in the amount of thermal expansion acts as an additional tension on the mask 13 supported by the support member 12. Accordingly, the mask 13 has a reduced tensile force after the burnout and blackening process. The decrease in tension of the mask 13 causes a howling phenomenon or a problem that the electron beam drifts due to thermal deformation of the mask 13.

As will be appreciated, the tension mask assembly 10 will be a key technical element to secure the howling characteristics and to correct the error that the electron beam misses to the desired position of the fluorescent film due to thermal expansion generated during driving of the cathode ray tube. .

To this end, the conventional tension mask assembly 10 is provided with a metal member 14 on the back of the rigid member 12 in a position opposite to the mask (13). At this time, the thermal expansion coefficient of the metal member 14 is greater than the thermal expansion coefficient of the rigid member 12.

However, the conventional tension mask assembly 10 has the following problems.

First, in order to prevent the amount of expansion of the rigid member 12 in the direction in which the tensile force of the mask 13 acts, a metal member 14 having a larger coefficient of thermal expansion is attached to the rear surface of the rigid member 12 so that The relative thermal expansion due to the increase in operating temperature and the amount of mis-landing of the electron beam are reduced, and the amount of thermal expansion correction is not sufficient as desired, and an additional additional correction means is required. Has the disadvantage that it cannot be reduced.

Second, the cathode ray tube employing the mask 13 to which the tensile force is applied is changed according to the distribution of the tension applied to the mask 13 in the howling phenomenon, and the tension mask assembly 10 is subjected to high temperature such as blackening and burning process. Since there is a limit in controlling the distribution of the tensile force applied to the mask 13 after the heat treatment process of, it can be said that vibration characteristics such as howling phenomenon are further deteriorated.

The present invention is to solve the above problems, the vibration damping means is installed to improve the mis-landing and vibration characteristics of the electron beam by preventing the deformation of the mask due to thermal expansion between the mask is applied to the tensile force and each frame supporting it The purpose is to provide a tension mask assembly.

1 is a perspective view showing a conventional tension mask assembly,

2 is a cross-sectional view of the cathode ray tube according to an embodiment of the present invention;

3 is an exploded perspective view showing a tension mask assembly according to a first embodiment of the present invention;

4 is a perspective view illustrating a state in which the tension mask assembly of FIG. 3 is coupled;

5 is a front view schematically showing a main part of the tension mask assembly of FIG.

Figure 6 is an exploded perspective view showing the main part of the tension mask assembly according to a second embodiment of the present invention,

Figure 7 is an exploded perspective view showing the main portion of the tension mask assembly according to a third embodiment of the present invention,

Figure 8 is an exploded perspective view showing an extract of the main part of the tension mask assembly according to a fourth embodiment of the present invention,

9A is a graph showing the attenuation waveform at point A of the tension mask in Comparative Example;

9B is a graph showing the attenuation waveform at point B of the tension mask in the comparative example;

9C is a graph showing the attenuation waveform at point C of the tension mask in Comparative Example;

9D is a graph showing the attenuation waveform at the D point of the tension mask in the comparative example,

FIG. 10A is a graph showing the attenuation waveform at point A of the tension mask in the embodiment;

FIG. 10B is a graph showing the attenuation waveform at point B of the tension mask in the embodiment;

10C is a graph showing the attenuation waveform at point C of the tension mask in the embodiment;

FIG. 10D is a graph showing the attenuation waveform at point D of the tension mask in the embodiment. FIG.

<Brief description of symbols for the main parts of the drawings>

20 Cathode ray tube 21 Panel

22 ... Funnel 23 ... Inner magnetic shield

24 ... deflection yoke 25 ... electron gun

26 Stud pins 27 Hooks

28..Spring 30..Tension mask assembly

31 Tension mask 32 Support member

33 rigid member 34 support

300 ... vibration damping means 301 ... vibration damping unit

302 ... Government303 ... Flange Department

Tension mask assembly according to an aspect of the present invention to achieve the above object,

A frame including a pair of support members installed to face each other, and a pair of rigid members installed between the support members and supporting the support members;

A tension mask installed on the pair of supporting members while being provided with a tensile force, and having a plurality of slots through which an electron beam passes;

A support having a thermal expansion coefficient smaller than that of the rigid member to be installed in the frame in a direction in which tension is applied to the tension mask and to correct thermal deformation of the tension mask due to a difference in thermal expansion between the tension mask and the frame; And

And a vibration damping means installed on a rear surface of the support in an outward direction with respect to the tension mask and vibrating with the support to damp the vibration of the support.

In addition, the vibration damping means is installed in a direction parallel to the direction in which the support is installed.

In addition, the vibration damping means is characterized in that spaced apart from the back of the support.

Further, the vibration damping means is characterized in that the welding fixed to at least one place and the back of the support.

Further, the vibration damping means is characterized in that it comprises a plate-shaped vibration damping portion installed in a direction parallel to the support, and a fixing portion extending from the vibration damping portion to the rigid member.

2 shows a cathode ray tube 20 according to an embodiment of the present invention.

Referring to the drawings, the cathode ray tube 20 includes a panel 21 having a planar screen on which an fluorescent film 21a is formed on an inner surface thereof, and a funnel 22 that is combined with the panel 21 to form a bulb. A tension mask assembly 30 according to a feature of the present invention is installed at a predetermined distance from the inside of the panel 21. An inner magnetic shield 23 is provided at the tension mask assembly 30. A deflection yoke 24 is provided on the outer circumferential surface of the cone portion 22a of the funnel 22, and a cathode for scanning the electron beam into the fluorescent film 21a inside the neck portion 22b of the funnel 22; The electron gun 25 in which a plurality of electrodes are arranged in succession is provided.

FIG. 3 shows the tension mask assembly 30 of FIG. 2 separated, and FIG. 4 shows a state in which the tension mask assembly 30 of FIG. 3 is assembled.

3 and 4, the tension mask assembly 30 is installed on the tension mask 31, a support member 32 supporting the tension mask 31, and a lower portion of the support member 32. It includes a rigid member 33 and the support member 34 is installed on the support member or the rigid member 33. A hook 27 and a hook 27 are supported on the outer wall of the support and rigid members 32 and 33 so that the tension mask assembly 30 is suspended and supported in the panel 21 (see FIG. 2). And a plurality of springs 28 are coupled to the stud pins 26 formed on the inner wall of the panel 21.

The tension mask 31 connects a plurality of strips 31b that form slots 31a in a direction (Y direction) to which a tensile force is applied and spaced apart from the thin metal plate by a predetermined interval, and connects the adjacent strips 31b to each other. And a real bridge 31c defining the slot 31a, and a dummy bridge 31d extending from the strip 31b toward the slot 31a. The tension mask 31 is not limited to the above-described embodiment and may be replaced with a mask structure to which a tension force is applied.

The support member 32 is provided such that the first and second support members 35 and 36 face each other so that the tension mask 31 can support both side edges in the long side direction (X direction). The first and second support members 35 and 36 may include a fixing part 32a that provides a mounting surface on which the lower surface of the tension mask 31 is mounted, and an inner side facing from a lower end of the fixing part 32a. It consists of the flange part 32b extended in a direction. Accordingly, when the first and second support members 35 and 36 are cut in the direction in which the tensile force is applied to the tension mask 31, the cross-section is “L” shaped.

A rigid member 33 is provided at the lower end of the support member 32. The rigid member 33 includes first and second rigid members 37 and 38 facing each other to apply tension to the tension mask 31 welded to the support member 32. The first and second rigid members 37 and 38 may include a first support part 33a fixed to the first support member 35 and a second support part fixed to the second support member 36, respectively. 33b and a connecting portion 33c for connecting the first and second supporting portions 33a and 33b to each other.

The support 34 is located at both ends of the support member 32 in the longitudinal direction (X direction), respectively. The support 34 is disposed in a direction (Y direction) in which tension is applied to the tension mask 31, and is disposed on an upper surface of each flange portion 32b of the first and second support members 35 and 36. The welding is fixed. The support 34 is the tension mask 31 by the thermal expansion difference between the combined tension mask 31, the support member 32, and the metal member 31 to 33 during the blackening and burning process of the rigid member 33. It is made of a material having a smaller coefficient of thermal expansion than the rigid member 33 in order to cause plastic deformation and thereby correct mis landing of the electron beam.

The support 34 has a metal beam shape in which both ends are welded and fixed to the first and second support members 35 and 36, respectively. The support 34 of such a shape is easily vibrated by an external impact, and the vibration attenuation time due to the difference in thermal expansion rate becomes long. Such vibration affects the frame made of the tension mask 31 and the support and rigid members 32 and 33 supporting the tension mask 31 to generate an error in correcting mis-landing.

According to a feature of the present invention, a vibration damping means 300 is installed in a frame such as the support or rigid member 32, 33 to vibrate with the support 34 to reduce the vibration attenuation time.

More detailed description is as follows.

The vibration damping means 300 is installed at a position close to the support 34. That is, the vibration damping means 300 is opposite to the portion in which the tension mask 31 is installed at both ends of the first and second support members 35 and 36 in the longitudinal direction (X direction). And first and second vibration damping means 310 and 320 positioned on the rear face 34a side of the support body 34 in a direction. The first and second vibration damping means 310 and 320 are the same member. The vibration damping means 300 is a thin metal material having a maximum permeability of approximately 2000, and a magnetic material such as steel is preferable.

The vibration damping means 300 is both ends of the first and second support members 35 and 36 to be parallel to the support 34 which is a direction (Y direction) in which the tension mask 31 is applied with a tensile force. And a vibration damping portion 301 of a flat plate type having a fixed position. The width W1 of the vibration damping part 301 is the support 34 in the tube axis direction (Z axis) of the tension mask assembly 30, as shown in FIG. Is formed relatively larger than the width W2.

At least one fixing part 302 extends from the vibration damping part 301 in the tube axis direction. The fixing part 302 extends from the lower end of the long side of the vibration damping part 301 in the direction in which the rigid member 33 is installed. The length of the fixing part 302 preferably has a length weldable to the outer wall of the rigid member 33. The flange portion 303 is formed from the fixing portion 302 in the direction in which the tension mask 31 is provided. The flange portion 303 is located on the bottom surface of the rigid member 33.

5 illustrates a state in which the vibration damping means 300 is welded and fixed to the support and the rigid members 32 and 33 and the support 34.

Referring to the drawings, both ends of the vibration damping unit 301 are fixed to the first support member 35, the end of the second support member 36, the welding point A, and the welding point B.

At this time, the vibration damping means 300 including the vibration damping unit 301 is fixed at a position close to the support 34 to increase the vibration damping effect on the support 34, such as welding, rivets, clips, etc. It is fixed at least one portion of the support 34 by the fixing means.

When the vibration damping unit 301 is located at a close distance to the support 34, maintaining the distance of 1 mm or less may vibrate with the support 34 to reduce the vibration attenuation time. It would be desirable.

In the present embodiment, the vibration damping means 300 is fixed to at least one place with respect to the support 34, and when the vibration with the support 34 brings about a reduction in the elastic energy of the support 34 by mutual friction, etc. This structure can reduce the decay time.

That is, the vibration damping unit 301 is fixed to the inner surface corresponding to the back surface of the support 34 at the support 34, the welding point C and the welding point D. Such a welding point is formed in at least one place along the longitudinal direction of the said support body 34.

In addition, the flange portion 303 (see FIG. 3) formed at the end of the fixing portion 302 integrally extending from the vibration damping portion 301 is in contact with the bottom surface of the rigid member 37. 37) and welding is fixed at welding point E and welding point F.

As a result, the vibration damping means 300 is the vibration damping portion 301 is fixed to the welding member 32 including the first and second support members 35, 36 by the welding points A and B, The vibration damping portion 301 is fixed to the support 34 by welding points C and D. FIG. In addition, the flange portion 303 is welded to the rigid member 33 including the first and second rigid members 37 and 38 by welding points E and F. FIG.

In this way, the vibration damping means 300 is fixed to the support and the support member 34, as well as the frame of the support and the rigid member 32, 33, at least one, it is possible to vibrate with the support 34 It can be said.

The vibration damping means 300 should be made of a material having excellent vibration damping characteristics and a magnetic shielding effect in order to reduce the vibration damping time and simultaneously perform a shielding function against an external magnetic field, especially a geomagnetic field. To this end, the vibration damping means 300 is better in permeability than a frame such as the support and the rigid members 32, 33, and preferably made of a soft magnetic material.

For example, a frame such as the support and the rigid members 32 and 33 is a metal material having a high carbon content to support the tension mask 31 with elastic force, and the maximum permeability value is about 1000. The carbon content of the support and rigid members 32, 33 is at least 0.1 wt%.

The vibration damping means 300 is a magnetic material having a relatively high permeability value than a frame such as the support and rigid members 32 and 33, and the carbon content is 0.1 lower than that of the support and rigid members 32 and 33. Steel materials having a value of wt% or less are preferable. The maximum permeability of the vibration damping means 300 is approximately two times higher than the maximum permeability of the support and rigid members 32 and 33, and the maximum permeability value is about 2000 magnetic material.

In addition, the vibration damping means 300 is advantageously formed to be 0.3 mm or less. When the thickness of the vibration damping means 300 is thick, there is no vibration preventing effect. Furthermore, it is desirable to have a thickness capable of supporting the support and the rigid members 32 and 33 without affecting the frame such as the support 27 and without interference with the spring 28 supported on the hook 27. .

Figure 6 shows an extract of the features of the tension mask assembly according to a second embodiment of the present invention.

Hereinafter, in the embodiments described, the same reference numerals as in the previously shown drawings indicate the same members having the same function.

Referring to the drawings, a pair of support members 35 and 36 are provided to face each other. The above-described tension mask 31 (see FIG. 3) is mounted on upper surfaces of the fixing portions 32a of the first and second supporting members 35 and 36. At the lower ends of the first and second support members 35 and 36, a rigid member 38 having elastic force in a direction in which a tension force is applied to the tension mask 31 is provided.

In the flange portion 32b of the first and second support members 35 and 36, a support 34 made of a metal material having a smaller coefficient of thermal expansion than the rigid member 38 has a tensile force applied to the tension mask 31. It is provided in the same direction as the direction to be applied. When the support 34 is cut in the width direction, the support 34 has a cross section of an “L” shape.

Here, the vibration damping means 600 is provided on the back surface 34a of the support body 34. The vibration damping means 600 is a vibration damping portion 601 of the plate installed in a direction parallel to the support 34, and at least one fixing portion 602 extending in the tube axis direction from the vibration damping portion 601 It includes.

The vibration damping portion 601 is welded to the end portions in the longitudinal direction of the first and second supporting members 35 and 36. The vibration damping unit 601 may be located at a position close to the rear surface 34a of the support 34 or directly welded to the rear surface 34a. When the vibration damping unit 601 is located close to the support 34, it is preferable to maintain a distance of 1 mm or less so as to be vibrable with the support 34.

From the vibration damping portion 601, the plate-shaped fixing portion 602 extends intermittently and integrally toward the rigid member 38 in the tube axis direction. The fixing part 602 has a length weldable to an outer wall of the rigid member 38.

Figure 7 shows an extract of the features of the tension mask assembly according to a third embodiment of the present invention.

Referring to the drawings, a pair of support members 35 and 36 are disposed to face each other, and a pair of rigid members 38 are disposed to face the lower end thereof. Tensile force is applied to the tension mask 31 (see FIG. 3) by a support 710 having a thermal expansion coefficient smaller than that of the rigid member 38 to the flange portions 32b of the first and second support members 35 and 36. Is installed in the direction of Both ends of the support 710 are welded and fixed to the flange portions 32b of the first and second support members 35 and 36. When the support 710 is cut in the width direction, the support 710 forms a rectangular cross section.

The rear surface of the support 710 is provided with a vibration damping means 700 that can vibrate at the same time to reduce the vibration attenuation time. The vibration damping means 700 is installed in a direction parallel to the direction in which the support 710 is installed, the vibration damping portion 701 is fixed to the end of the first and second support members 35 and 36, And a fixing part 702 extending from the vibration damping part 701 in a direction in which the rigid member 38 is installed.

The vibration damping portion 701 is directly welded and fixed to the support 701, or is installed to maintain a gap of less than 1 millimeter, the fixing portion 702 is welded to the outer wall of the rigid member 38 is have.

Figure 8 shows an extract of the features of the tension mask assembly according to a fourth embodiment of the present invention.

Referring to the drawings, a pair of support members 35 and 36, on which the tension mask 31 (see Fig. 3) is welded and fixed to the upper surface of the fixing portion 32a, is provided to face each other. At the lower ends of the first and second support members 35 and 36, a pair of rigid members 38 having elastic force in the direction in which the tensile force is applied to the tension mask 31 is provided to face each other.

In the flange portion 32b at the end portions of the first and second support members 35 and 36, a support 34 made of a metal material having a smaller coefficient of thermal expansion than the rigid member 38 has a tensile force applied to the tension mask 31. The welding is fixed in the direction of application. When the support body 34 is cut in the width direction, it forms an “L” shape.

At this time, the back of the support 34 vibrates at the same time, the vibration damping means 800 that can reduce the elastic energy of the support 34 due to the friction generated at this time, and as a result reduce the vibration attenuation time It is installed.

The vibration damping means 800 includes a flat vibration damping portion 801 positioned in a direction parallel to the direction in which the support 34 is installed. Both ends of the vibration damping part 801 are fixed to both ends of the first and second supporting members 35 and 36 on the rear surface side of the support body 34. The width of the vibration damping portion 801 is relatively larger than the width of the support 34 will be said to be advantageous for the geomagnetic shielding. In addition, the vibration damping unit 801 is welded to at least one or more of the rear surfaces 34a of the support body 34 or maintains an interval of 1 millimeter or less with the support body 34.

From the vibration damping part 801, the fixing part 802 extends integrally toward the rigid member 38. The fixing portion 802 is formed intermittently from the lower end of the long side portion of the vibration damping portion 801, and has a length that can be positioned on the outer wall of the rigid member 38.

The first flange portion 803 extends from the fixing portion 802 in the inward direction in which the tension mask 31 is installed. The first flange portion 803 may be welded and fixed in surface contact with the bottom surface of the rigid member 38. In addition, a plurality of second flange portions 804 are formed in the vibration damping portion 801 in an inward direction in which the tension mask 31 is installed from the lower end of the long side portion. The second flange portion 804 may be welded and fixed in surface contact with the lower surface of the support 34.

Accordingly, the vibration damping means 800 is a vibration damping portion 801 is welded to both ends of the first and second support members 35, 36, the first flange portion 803 is rigid The bottom of the member 38 is welded and fixed, the second flange portion 804 is welded to the bottom of the support 804, the vibration damping portion 801 is the back surface 34a of the support 34 It is installed to be selectively welded to the.

The operation of the tension mask assembly 30 according to the present invention having the structure as described above will be described with reference to FIG. 3.

The tension mask assembly 30 is mounted in a direction (Y direction) in which the tension mask 31 is applied with tension force on the upper surfaces of the fixing parts 32a of the first and second support members 35 and 36. First and second rigid members 37 and 38 are provided at lower ends of the first and second support members 35 and 36 to apply elastic force thereto.

At this time, the rigid member in order to prevent the tension mask 31 from being deformed due to the difference in thermal expansion between the tension mask 31 and the frame made of the supporting and rigid members 32 and 33 during the heat treatment at a high temperature. A support body 34 made of a metal having a smaller coefficient of thermal expansion than 33 is welded to the flange portion 32b of the support member 32. Accordingly, when the tension mask assembly 30 is thermally expanded when the cathode ray tube is driven, a tensile force is substantially applied to the support 34.

The tension mask assembly 30 to which the tensile force is applied is vibrated by an impact applied from the outside or the sound pressure of the speaker. As a result, in order to reduce the phenomenon that the electron beam scanned from the electron gun misses the fluorescent film inside the panel. The installed support body 34 also vibrates.

According to a feature of the present invention, the tension mask assembly 30 is provided with a vibration damping means 300 which is in close proximity to the support 34 or in direct contact with one point.

That is, the vibration damping portion 301 is installed on the rear surface 34a of the support 34 while maintaining a space of approximately 1 millimeter, and the tube member direction (300) in which the rigid member 33 is installed from the vibration damping portion 301 ( The fixed portion 302 extends in the Z direction). Both ends of the vibration damping part 301 are welded to both ends of the first and second support members 35 and 36, and the tension mask 31 is located inward from the fixing part 302. The extended flange portion 303 is welded to the lower surface of the first and second rigid members 37 and 38. On the other hand, the vibration damping portion 301 is selectively welded to the back surface 34a of the support 34.

As a result, the frequency according to the vibration of the support body 34 and the frequency according to the vibration of the vibration damping unit 301 provided on the rear surface 34a of each other cancel each other, thereby reducing the vibration attenuation time.

That is, the space | interval between the said support body 34 and the vibration damping part 301 is provided narrow. As a result, when the support body 34 vibrates, the vibration damping unit 301 also vibrates, and the support body 34 rapidly decreases its elastic energy due to vibration interference such as friction. You can save time.

Further, when the vibration damping portion 301 is fixed to at least one of the back surfaces 34a of the support body 34, the vibration interference of the vibration damping part 301 with respect to the support body 34 is more reliably. can do.

Looking at the vibration characteristics of the tension mask by the vibration damping means 300 as described above through the results of the present application, it can be seen that the vibration damping time is significantly reduced.

[Comparative Example]

In the comparative example, only the support is installed in the tension mask assembly, and the vibration damping waveforms at points A, B, C, and D of the tension mask shown in FIG. 4 are measured. In this case, it is for displaying each point of the tension mask 31, and the vibration damping means 300 which concerns on the characteristic of this invention is not provided.

Points A to D are located coaxially in the long side direction (X direction) with the central portion of the tension mask 31 as the center point. If the distance from the center point of the tension mask 31 to the edge is 200 millimeters, the point A is 75 millimeters, the point B is 100 millimeters, the point C is 150 millimeters, and the point D is 197 millimeters.

Graphs showing the vibration damping waveforms at points A to D are shown in FIGS. 9A to 9D, and the results are shown in Table 1 below.

Tension mask location A B C D Maximum amplitude (㎛) 58 53 40 55 4 μm Decay time (seconds) 8.6 8.9 2.3 0.6

9A to 9D show a waveform in which the tension mask decreases in amplitude with time, with the horizontal axis representing time and the vertical axis representing amplitude of the tension mask. On the other hand, the 4 μm Decay time refers to the time taken for the amplitude of the tension mask to be 4 μm or less.

Referring to the graph and Table 1, when the distance from the center point is increased to 75, 100, 150, 197 millimeters, the maximum amplitude is 58㎛, 53㎛, 40㎛, 55㎛. In addition, it turns out that a 4 micrometer Decay time represents 8.6 second, 8.9 second, 2.3 second, and 0.6 second.

EXAMPLE

In the embodiment, the support 34 is installed in the direction in which the tension mask 31 is applied to the tension mask 31 in the tension mask assembly 30, and the vibration damping means 300 capable of vibrating at the same time is provided on the rear surface of the support 34. The case is shown.

In this case, the vibration damping waveforms at points A, B, C and D of the tension mask 31 shown in Fig. 4 are measured.

Points A to D refer to the same point located on the coaxial line in the long side direction (X direction) with the center point as the center point for comparison with the result of the comparative example. That is, if the distance from the center point of the tension mask 31 to the edge is 200 millimeters, the point A is 75 millimeters, the point B is 100 millimeters, the point C is 150 millimeters, and the point D is 197 millimeters. to be.

The vibration damping waveforms at points A to D are shown in the graphs of FIGS. 10A to 10D, and the results are shown in Table 2 below.

Tension mask location A B C D Maximum amplitude (㎛) 48 43 35 45 4 μm Decay time (seconds) 6.3 8.4 1.0 0.6

Referring to the graph and Table 2, when the tension mask 31 increases in the X-axis direction at a distance of 75, 100, 150, and 197 millimeters from the center point, the maximum amplitude of the tension mask 31 is 48 µm and 43 µm. , 35 µm and 45 µm. In addition, it can be seen that the time taken for the amplitude of the tension mask 31 to be 4 μm or less represents 6.3 seconds, 8.4 seconds, 1.0 seconds, and 0.6 seconds, respectively.

As can be seen from the comparative examples and examples, the amplitude of the tension mask 31 according to the features of the present invention is reduced by at least 12.3% and at most 18.8% than the amplitude of the tension mask of the comparative example. In addition, it can be seen that the vibration damping time of the tension mask 31 of this embodiment is reduced by up to 56.5% from the vibration damping time of the tension mask of the comparative example.

It can be seen from the experiments described above that when the vibration damping means is provided directly adjacent to the support or directly, the time to reach the amplitude of the tension mask to be within 4 μm is significantly reduced.

As described above, the tension mask assembly of the present invention can obtain the following effects.

First, the vibration attenuation means which is directly adjacent to the support, or directly welded to the support is installed, so that the vibration damping means vibrates during the vibration of the support, thereby reducing the vibration attenuation time of the tension mask.

Second, by using the tension mask assembly employing the vibration damping means, the vibration damping time and amplitude of the tension mask is reduced, it is possible to reduce the mis-landing phenomenon of the electron beam due to the vibration of the support to the maximum. Accordingly, deterioration of focusing on the screen can be prevented.

Third, the vibration damping means is made of a magnetic material having a high permeability, and may bring about a shielding effect of an external magnetic field, particularly a geomagnetic field.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and it will be understood that various modifications and equivalent other embodiments are possible from those skilled in the art. Therefore, the true technical protection scope of the present invention will be defined by the appended idea.

Claims (17)

A frame including a pair of support members installed to face each other, and a pair of rigid members installed between the support members and supporting the support members; A tension mask installed on the pair of supporting members while being provided with a tensile force, and having a plurality of slots through which an electron beam passes; A support having a thermal expansion coefficient smaller than that of the rigid member to be installed in the frame in a direction in which tension is applied to the tension mask and to correct thermal deformation of the tension mask due to a difference in thermal expansion between the tension mask and the frame; And And a vibration damping means installed on a rear surface of the support in an outward direction with respect to the tension mask and vibrating with the support to attenuate vibration of the support. The method of claim 1, The vibration damping means is a tension mask assembly, characterized in that installed in a direction parallel to the direction in which the support is installed. The method of claim 2, The vibration damping means is a tension mask assembly, characterized in that spaced apart from the back of the support. The method of claim 3, And the vibration damping means is installed to maintain a distance of 1 mm or less from the rear surface of the support. The method of claim 2, The vibration damping means is a tension mask assembly, characterized in that the welding fixed to at least one place with the back of the support. The method of claim 1, The vibration damping means is a tension mask assembly, characterized in that the carbon content is relatively lower than the frame. The method of claim 1, And said vibration damping means has a thickness of 0.3 millimeter or less. The method of claim 1, The vibration damping means is a tension mask assembly, characterized in that the welding fixed to the pair of support members. The method of claim 1, The vibration damping means is a tension mask assembly, characterized in that the welding fixed to a pair of rigid members. The method of claim 1, The vibration damping means, Tension mask assembly, characterized in that it comprises a plate-shaped vibration damping portion installed in a direction parallel to the support, and a fixing portion extending from the vibration damping portion to the rigid member. The method of claim 10, The fixing mask assembly is a tension mask assembly, characterized in that a plurality of flat intermittently extending toward the rigid member from the lower end of the long side portion of the vibration damping portion. The method of claim 11, Wherein the vibration damping means is a tension mask assembly, characterized in that the first flange portion toward the inner side from which the tension mask is installed is further formed. The method of claim 10 or 12, Wherein the vibration damping means is a tension mask assembly, characterized in that further formed from the lower end of the long side portion of the vibration damping portion toward the inner side where the tension mask is installed. The method of claim 10, And the vibration damping part is welded to an end of the pair of support members and selectively welded to a rear surface of the support. The method of claim 10, The fixing part is a tension mask assembly, characterized in that the welding fixed to the outer wall of the pair of rigid members. The method of claim 12, And the first flange part is welded to the bottom surface of the pair of rigid members. The method of claim 13, And the second flange portion is welded to the bottom surface of the support.