KR100403769B1 - the color Cathode-ray Tube - Google Patents

Abstract

The present invention relates to a color cathode ray tube, comprising: a shadow mask comprising an effective portion having an electron beam passing hole formed therein and an invalid portion surrounding the effective portion, and a colored cathode tube having a frame for welding and supporting an invalid portion of the shadow mask. The ineffective portion includes a skirt that is bent parallel to the tube axis, and at least one end portion of the skirt includes a bent portion that is bent inwardly in the frame to facilitate insertion of the skirt into the frame.

Thus, the present invention, by first forming the bent portion on the skirt end of the shadow mask, it is possible to improve the mechanical strength of the shadow mask itself, and secondly, the skirt spreading phenomenon of the shadow mask, and the gap between the notch and the notch Since the phenomenon is improved and the end of the skirt is bent toward the inside of the frame, it is easy to assemble the shadow mask on the frame, thereby increasing the work efficiency in the assembly process. Third, the shadow mask caused by the interference of the shadow mask and the frame 4, the effective screen size can be maximized in the color cathode ray tube of the same size by increasing the electron beam through hole of the shadow mask.

Description

Color cathode ray tube {the color Cathode-ray Tube}

The present invention relates to a color cathode ray tube, and more particularly, to form a bent portion in a skirt of the shadow mask to reinforce the mechanical strength of the shadow mask itself, to prevent opening of the skirt, and to improve the insertability of the shadow mask and the frame. The present invention relates to a color cathode ray tube which increases efficiency and prevents shadow mask damage caused by interference.

Figure 1 is a partial cross-sectional view of a typical color cathode ray tube, Figure 2 is a view showing the shape of a typical foamed mask, Figure 3 is a view showing the shape of a typical frame, Figure 4 is a side with a conventional shadow mask and the frame is coupled It is a cross section.

As shown in FIG. 1, a general color cathode ray tube includes a panel 1 having a fluorescent surface 4 coated with red, green, and blue fluorescent materials on an inner wall thereof, and a frit glass behind the panel 1. A funnel (2) fused by using the electron gun (12) and a predetermined phosphor encapsulated in the neck portion of the funnel (2) to emit and accelerate and focus by emitting three electron beams of red, green and blue colors It consists of a shadow mask (3) for sorting colors to emit light and a frame (7) for supporting the shadow mask.

There is also a spring 8 which allows the frame assembly to be coupled to the panel and a stud pin 13 which supports the spring. Accordingly, the inner shield 9, which allows the cathode ray tube to be less affected by external geomagnetism during operation, is coupled to the frame and sealed with high vacuum.

Next, in the electron gun 12 embedded in the neck portion of the funnel 2, the electron beam 6 strikes the fluorescent surface 4 formed on the inner wall surface of the panel 1 by the anode voltage applied to the cathode ray tube. In this case, the electron beam is deflected up, down, left and right by the deflection yoke 5 before reaching the fluorescent surface to form a screen.

Then, there is a magnet 10 of 2, 4, 6 poles that corrects the trajectory of the traveling direction so that the electron beam 6 strikes a predetermined phosphor precisely, thereby preventing poor color purity.

In addition, the color cathode ray tube with the shadow mask 3 includes red, green, and blue beams scanned from the electron gun passing through the shadow mask, and the electron beams are landed on the red, green, and blue phosphors, respectively, to achieve a desired color. The system is adopted.

Referring to FIG. 2, the shadow mask 3 is formed in a straight line that is bent at substantially right angles around the effective portion 33 ′ having an electron beam passing hole 33 through which the electron beam passes, and around the effective portion 33 ′. An ineffective part 31 ′ including a skirt 31 is provided, and the skirt 31 is inserted into the frame 7 so that the inner surface of the frame is in the long side center portion, the short side center portion, and each diagonal axis of the shadow mask. Welded at the location where it touches.

The shadow mask frame in which the shadow mask and the frame are assembled is combined with a spring 8 welded to the outside of the frame by a stud pin 13 fixed to the inner circumferential surface of the panel 1, and a fluorescent surface coated on the inner circumferential surface of the panel ( 4) is placed at regular intervals.

In addition, the skirt 31 of the shadow mask is formed with notches 32 formed by cutting a predetermined number of shadow masks on the long side and the short side, respectively, and the notch prevents concentration of stress generated during press molding of the shadow mask. In order to make it suitable, it is formed in an appropriate number.

The notch 32 uniformly disperses the stress generated when forming the skirt 31 in the press process for forming a foamed mask, and prevents wrinkles from occurring so that the acoustic regeneration phenomenon due to external vibration (howling: howling: ), And also prevents deformation of the curved surface of the shadow mask, which is accompanied by an increase in temperature of the shadow mask 3 generated by the irradiation of the electron beam during the color cathode ray tube operation, so that the electron beam is accurately landed at the position of the phosphor.

In the color cathode ray tube having the shadow mask 3 embedded therein, the red, green, and blue beams scanned from the electron gun pass through the electron beam through holes of the shadow mask, and the electron beams are landed on the phosphors of red, green, and blue, respectively. Adopt a color implementation.

Accordingly, the shadow mask 3 is press-fitted and combined to weld the skirt 31 in the frame 7 to maintain the curved surface of the electron beam through hole 33, and also the skirt generated during press molding of the shadow mask. In order to minimize the wrinkles of 31 and the stress deformation of the welded portion generated when the shadow mask is welded to the frame, the effect of increasing the depth of the notch 32 of the shadow mask is greater.

When the shadow mask is inserted into the frame, there should be no deformation or damage of the shadow mask due to the interference of the shadow mask and the frame, so that the greater the mechanical strength of the shadow mask itself, the greater the damage to the shadow mask. Such damage of the shadow mask changes the landing position of the electron beam, and deterioration of image quality is inevitable.

As described above, the strength of the shadow mask increases in proportion to its thickness, but if the thickness is thickened, the cost increases, so that the structure has an easy structure in the manufacturing process while obtaining the maximum mechanical strength at the minimum thickness. It is preferable.

In general, in the cathode ray tube, the shadow mask mainly uses a thin plate such as aluminium copper (AK material) or inva material (low expansion material) having a thickness of about 0.1 mm to 0.3 mm.

Then, the shadow mask is inserted into the inner surface of the frame and welded. In order to maintain the shape of the curved surface, the shadow mask is press-fitted into the frame and welded. To do this, the size of the long axis, short axis, and diagonal axis of the shadow mask is sufficiently large.

However, in the conventional color cathode ray tube as described above, as the size of the shadow mask increases, the shadow mask and the frame are difficult to assemble in the process of assembling the shadow mask to the frame, thereby reducing work efficiency, and also causing shadow masks due to interference. Damage occurs. Therefore, there is a problem that the size of the shadow mask is restricted and the size of the shadow mask effective screen is also reduced.

In addition, as in the skirt 31 shown in Fig. 4, since the linear shape is almost straight, the shadow mask is liable to be damaged even by small impact or interference in the assembling process.

In addition, in order to minimize the wrinkle deformation of the skirt generated during the molding process of the shadow mask and the stress deformation of the weld portion generated when welding the shadow mask to the frame, a notch 32 is formed in the skirt of the shadow mask. In addition, the notch may be preferable because it plays a role of preventing damage to image quality by preventing an external acoustic regeneration phenomenon and a dominant phenomenon caused by thermal expansion of the shadow mask.

However, the notch 32 as described above has a greater effect as the depth is deeper, while the depth of the notch may occur between the notch and the notch of the shadow mask, and the interference between the shadow mask and the frame during the shadow mask assembly process. There is a problem that the damage of the shadow mask is likely to occur.

In addition, in order to increase the adhesion between the shadow mask and the frame and to prevent the damage of the shadow mask due to an external impact or the acoustic regeneration effect caused by external vibration, the longer the skirt length is, the greater the effect. As the length of the skirt becomes longer, the efficiency of work in the assembly process of the shadow mask and the frame is reduced, and the shadow mask is damaged by the interference of the shadow mask and the frame.

In order to prevent the shadow mask from being damaged, the shadow mask may be made thick, but the cost may be increased by increasing the thickness of the shadow mask.

Therefore, the present invention has been made to solve the above problems, the object of the present invention is that the shadow mask is not damaged by the interference of the shadow mask and the frame during the assembly process of the shadow mask on the frame and the assembly operation is easy It is to provide a colored cathode ray tube.

In addition, another object of the present invention is to provide a color cathode ray tube which allows the shadow mask and the frame to be easily assembled without mutual interference even if the skirt length of the shadow mask is increased or the effective area of the shadow mask is increased.

Still another object of the present invention is to provide a color cathode ray tube that can reinforce the strength of the shadow mask to prevent damage of the shadow mask due to the minute impact that may occur during the manufacturing process.

1 is a partial cross-sectional view of a typical color cathode ray tube,

2 is a view showing the shape of a general form mask,

3 is a view showing the shape of a general frame,

Figure 4 is a side cross-sectional view of a conventional shadow mask and the frame is coupled,

Figure 5 is a side cross-sectional view of the shadow mask and the frame according to the present invention,

6 is a detailed view of the portion A of FIG. 5 according to the present invention;

7 is a partial perspective view of a part of the shadow mask according to the present invention;

8 is a view showing a modified embodiment of the shadow mask according to the present invention,

9 is a side cross-sectional view of the shadow mask and the frame is a modified embodiment according to the present invention;

10 is a view showing another modified embodiment of the shadow mask according to the present invention.

<Description of Symbols for Major Parts of Drawings>

3: shadow mask 7: frame

31: skirt 31 ': invalid part

31a: upright part 31b, 31b ': bend part

31d, 31d ': protrusion 31c: upright end

32, 32a: notch 33: electron beam passing hole

33 ': effective part 34: welding point

In order to achieve the above object, the present invention is a color cathode ray tube having a shadow mask consisting of an effective portion formed with an electron beam through hole and an invalid portion surrounding the effective portion, and a frame for welding and supporting an invalid portion of the shadow mask, The ineffective portion includes a skirt that is bent parallel to the tube axis, and at least one end portion of the skirt includes a bent portion that is bent inwardly in the frame to facilitate insertion of the skirt into the frame.

Further, when L1 is the overall length of the skirt, and L2 is the length from the welding point to the end of the skirt, 0.2? It is preferable to satisfy ≤ 0.4.

L1 is the overall length of the skirt, and L3 is the length from the bending point of the skirt to the end portion, where 0 < It is preferable to satisfy ≤ 0.2.

Further, the bending angle θ of the skirt is preferably in the following range, 45 ° ≦ θ ≦ 70 °.

The skirt preferably further includes a protrusion 31d which protrudes in the direction perpendicular to the tube axis and extends in the skirt length direction.

Further, L1 is the overall length of the skirt, and the position L5 of the protrusion 31d is preferably between 0.4 L1 and 0.8 L1.

The height h of the protruding portion 31d is preferably formed to be 0.1t or more when the thickness of the skirt is t.

In addition, the short notch 32a is preferably formed between the long notch 32 and the notch 32 formed on one side of the skirt.

In addition, the present invention is a color cathode ray tube having a shadow mask consisting of an effective portion formed with an electron beam through hole and an invalid portion surrounding the effective portion, and a frame for welding and supporting an invalid portion of the shadow mask, wherein the invalid portion has a tube axis. And a skirt bent in parallel with each other, the end portion of at least one side of the skirt being bent outwardly of the frame so that the frame is easily inserted into the skirt of the shadow mask.

In addition, the present invention is a color cathode ray tube having a shadow mask consisting of an effective portion formed with an electron beam through hole and an invalid portion surrounding the effective portion, and a frame for welding and supporting an invalid portion of the shadow mask, wherein the invalid portion has a tube axis. And a skirt bent in parallel with each other, the length of the long axis, the short axis and the diagonal axis at the end of the skirt being shorter than the length of the long axis, the short axis and the diagonal axis of the skirt contacting the effective part. .

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

5 is a cross-sectional side view of the shadow mask and the frame according to the present invention, the shadow mask (3) is an effective portion 33 'is formed with an electron beam through hole 33 through which the electron beam passes, and the effective portion 33' It consists of an ineffective part 31 'including a skirt 31 formed in a straight line bent at a right angle around the perimeter.

Here, the skirt 31 is an upright portion 31a bent at a right angle at one side of the electron beam through hole 33, and bent obliquely toward the inside of the shadow mask at the end of the skirt upright portion 31a. The bent portion 31b is formed, and the upright end portion 31c is formed to be vertically upright again at the bent portion 31b.

Here, the upright portion 31a of the skirt is welded at the welding point 34 in contact with one side of the frame 7, so that the shadow mask 3 is inserted into the frame 7 and fixed.

Figure 6 is a detailed view of the portion A of Figure 5 showing a skirt according to the present invention, the upright portion 31a of the skirt 31 is a proper position of the long side, short side, diagonal axis of the frame for coupling the shadow mask and the frame Welding is performed as in the welding point 34 of FIG.

A bent portion 31b and an upright end portion 31c are formed at the end of the shadow mask skirt, that is, the long axis, the short axis and the length of the diagonal axis at the end of the skirt are in contact with the effective portion, It is shorter than the length of the diagonal axis.

According to the following relationship, the skirt of the shadow mask described above, where L1 is the overall length of the skirt, L2 is the length from the welding point to the end of the skirt, the following equation 0.2 ≤ It is preferable to satisfy ≤ 0.4. If the length L2 from the welding point to the end of the skirt is 0.4 times higher than the overall length L1 of the skirt, the position of the welding point 34 rises toward the electron beam through hole 33 so that the deformation of the skirt during welding passes through the electron beam. If the length (L2) from the welding point to the end of the skirt is 0.2 times lower than the overall length (L1) of the skirt, the weld point may be affected by the assembly error, etc., toward the end of the skirt. There is a possibility that the position of 34 cannot be secured.

Next, when L1 is the overall length of the skirt and L3 is the length from the bending point of the skirt to the end, the following expression 0 < It is preferable to satisfy ≤ 0.2. This is because, if the length L3 from the bending point of the skirt to the end portion is 0.2 times higher than the overall length L1 of the skirt, it is difficult to set the position of the welding point 34 in the skirt.

Further, the bending angle θ of the skirt is preferably in the following range, 45 ° ≦ θ ≦ 70 °. That is, as the bending angle θ of the bent portion 31b is increased, the strength is reinforced, but when the bending angle θ is larger than 70 °, the effect of insertability is lowered. Falls, and as the gap between the notch and the notch is improved, the effect of insertability is reduced.

Accordingly, since the interference between the shadow mask and the frame is reduced, damage to the shadow mask can be prevented, and even if the interference occurs, unlike the shape in which the conventional skirt end portion is upright, as in the skirt 31 shown in FIG. 4, In the shadow mask according to the present invention, as the shape of the bent portion 31b and the upright end portion 31c of the skirt, the end portion of the skirt is bent inward of the frame, thereby reducing the damage of the shadow mask.

As a result, the shadow mask 3 forms the bent portion 31b and the upright end portion 31c at the end of the skirt 31 to reinforce the strength of the shadow mask itself, thereby preventing the impact of the shadow mask 3 from handling or assembling in the manufacturing process. Damage to the shadow mask or damage to the shadow mask due to interference with the frame 7 is prevented, and the width of the long axis, the short axis, and the diagonal axis at the end of the skirt is determined by the inner size of the frame 7. It is small enough for easy insertion.

7 is a partial perspective view of a part of the shadow mask according to the present invention, as shown in the figure, a plurality of notches 32 are spaced apart from each other in the skirt 31 of the shadow mask, above the projection 31d. The notch 32a having a smaller size than the notch 32 is cut and formed toward the lower side of the protrusion 31d between the notch 32 and the notch 32.

As a result, the conventional shadow mask has a limitation in the number and depth of the notches 32 because the skirt gap between the notches and the notches is different depending on the region, but in the shadow mask of the present invention, By forming the same notch 32a in the skirt 31, the stress generated during press molding is completely eliminated and the adhesion between the shadow mask and the frame is increased, thereby preventing damage or acoustic regeneration of the shadow mask due to impact and preventing shadow mask. The thermal expansion phenomenon can also be improved.

8 is a view showing a modified embodiment of the shadow mask according to the present invention, the projection 31d protruding in the direction perpendicular to the tube axis in the middle of the skirt of the shadow mask is formed above the welding point 34, As a result, the strength reinforcing effect and the skirt opening phenomenon can be further improved.

At this time, if the position L5 of the protrusion 31d is lower than 0.4 L1 of the overall length L1 of the skirt, the strength reinforcing effect is reduced, so the position L5 of the protrusion is upright with the bent portion 31b of the skirt. It should be longer than the end 31c and the welding point 34.

In addition, if it is higher than 0.8 L1 of the total length L1 of the skirt, there is a difficulty in molding, so it is preferable to be between 0.4 L1 and 0.8 L1 as compared with the total length L1 of the skirt.

In addition, when the thickness of the shadow mask is t, the projected height h of the projected portion 32d shown in this figure may have an optimum effect in terms of strength reinforcement.

9 is a side cross-sectional view in which a shadow mask and a frame are coupled according to a modified embodiment of the present invention. As shown in the drawing, the color cathode ray tube includes an effective portion 33 'having an electron beam through hole 33 and the effective portion. A shadow mask 3 composed of an ineffective part 31 ′ surrounding a part and a frame 7 for welding and supporting an ineffective part 31 ′ of the shadow mask are included.

The ineffective portion 31 ′ includes a skirt 31 bent parallel to the tube axis, and the end portion of at least one side of the skirt is adapted to facilitate insertion of the frame 7 into the skirt 31 of the shadow mask. It includes a bent portion (31b) bent in the outward direction of the frame (7).

10 is a view showing a case of another modified embodiment of the shadow mask according to the present invention, the shadow mask has a projection (31d ') protruding perpendicularly in the direction opposite to the tube axis direction, that is to the outside in the middle of the skirt 31 And a bent portion 31b 'bent at a predetermined angle toward the outside of the skirt.

As described above, according to the present invention, first, by forming a bent portion at the end of the skirt of the shadow mask, it is possible to improve the mechanical strength of the shadow mask itself, and secondly, the skirt gap of the shadow mask, the notch and notch Since the gap between the gap is improved and the end of the skirt is bent toward the inside of the frame, it is easy to assemble the shadow mask on the frame, which increases the efficiency of the work in the assembly process. Third, the interference between the shadow mask and the frame Damage to the shadow mask can be prevented, and fourth, the effective size of the effective screen can be maximized in the color cathode ray tube of the same size by increasing the electron beam through hole of the shadow mask.

Claims (10)

In a color cathode ray tube having a shadow mask comprising an effective portion having an electron beam through hole formed therein and an invalid portion surrounding the effective portion, and a frame for welding and supporting the invalid portion of the shadow mask, The invalid portion includes a skirt bent parallel to the tube axis, An end portion of at least one side of the skirt includes a bent portion bent at a predetermined angle in the frame inward direction to facilitate insertion of the skirt into the frame, Where L1 is the overall length of the skirt and L3 is the length from the bending point of the skirt to the end of the skirt, Color cathode ray tube, characterized by satisfying ≤ 0.2. The method of claim 1, Where L1 is the overall length of the skirt and L2 is the length from the weld to the end of the skirt, A color cathode ray tube, characterized by satisfying ≤ 0.4. delete The method of claim 1, The bent angle (θ) of the skirt is a color cathode ray tube, characterized in that in the following range, 45 ° ≤ θ ≤ 70 °. The method of claim 1, The skirt is a color cathode ray tube, characterized in that it further comprises a projection (31d) extending in the longitudinal direction of the skirt protruding in the direction perpendicular to the tube axis direction. The method of claim 5, L1 is the total length of the skirt, and the position L5 of the projection 31d is between 0.4 L1 and 0.8 L1. The method of claim 5, The projection height (h) of the protrusion (31d) is a color cathode ray tube, characterized in that formed as 0.1t or more when the thickness of the skirt t. The method of claim 1, Collar cathode ray tube, characterized in that the short notch (32a) is formed between the long notch 32 and the notch 32 formed on one side of the skirt. In a color cathode ray tube having a shadow mask comprising an effective portion having an electron beam through hole formed therein and an invalid portion surrounding the effective portion, and a frame for welding and supporting the invalid portion of the shadow mask, The invalid portion includes a skirt bent parallel to the tube axis, An end portion of at least one side of the skirt is bent in an outward direction of the frame to facilitate insertion of the frame into a skirt of the shadow mask, Where L1 is the overall length of the skirt and L3 is the length from the bending point of the skirt to the end of the skirt, Color cathode ray tube, characterized by satisfying ≤ 0.2. delete