KR100624993B1 - Cathode Ray Tube - Google Patents

Abstract

The present invention relates to a cathode ray tube, wherein the cathode ray tube according to the present invention has a distance between a long axis, a short axis, and a diagonal axis of an opening formed at an inner side of a bottom portion of a frame at a central axis of the panel, and an electron beam as the cathode ray tube becomes slim. In the case where the cathode ray tube is slim and has a structurally unstable shape by selecting the ratio of the distance of the distance on the central axis from the deflection center beginning to deflection to the end surface of the skirt of the cathode ray tube panel to be within a predetermined range, respectively. In addition, by providing a frame having an optimal structural condition, it is possible to solve a problem in which shadows appear on the screen or a problem in which a halation occurs, thereby providing a high quality slim cathode ray tube.

Shadow mask, frame, deflection center, opening

Description

Cathode Ray Tube {Cathode Ray Tube}             

1 is a cross-sectional view showing the structure of a typical cathode ray tube,

2 is a perspective view of a frame marked with major, minor and diagonal axes;

3 is a perspective view showing the width of the opening of the frame of the cathode ray tube according to the present invention;

4 is a sectional view including a deflection center of the cathode ray tube according to the present invention;

5 is a cross-sectional view showing a cathode ray tube according to the present invention in comparison with a conventional cathode ray tube,

6 is a cross-sectional view showing the degree of slimming of the cathode ray tube.

<Explanation of symbols on main parts of the drawings>

6: frame 6b: bottom part

The present invention relates to a cathode ray tube, and more particularly, the cathode ray tube at a deflection center at which an electron beam starts to be deflected, and a distance between a long axis, a short axis, and a diagonal axis of an opening formed inside the bottom of the frame. By selecting the ratios of the long axis, short axis, and the distance of the center axis to the end of the diagonal axis of the panel within a predetermined range, the electron beam does not reach the fluorescent surface, which can solve the problem of shadows on the screen. It relates to a cathode ray tube.

In general, a cathode ray tube refers to a device that forms an electrical signal as an electron beam, scans it on a fluorescent surface, and converts it into an optical image for display.

1 is a cross-sectional view showing the structure of a typical cathode ray tube, the cathode ray tube is a panel (1), funnel (2), shadow mask (3), fluorescent surface (4), deflection yoke (5), frame (6), The subframe 7 includes a spring 8 and an inner shield 9.

An electron gun (not shown) is inserted into the rear side of the funnel 2 of the cathode ray tube, and the electron beam emitted from the electron gun is deflected up, down, left, and right by a deflection yoke 5 installed at the neck of the funnel 2. Proceed toward the panel 1.

The deflected electron beam passes through a through hole formed in the effective portion of the shadow mask 3 to reach the fluorescent surface 4 coated on the inner surface of the panel 1, and the fluorescent surface 4 emits light by the energy of the electron beam. The image is thereby reproduced, and the user can see the reproduced image through the panel 1.

In addition, the cathode ray tube includes a frame 6 supporting a shadow mask 3, and a spring 8 is installed to couple the frame 6 to the panel 1, and the shadow The subframe 7 is added to the mask 3 to reduce the howling phenomenon due to vibration, thereby strengthening the tension applied to the shadow mask 3.

In particular, the frame 6 comprises a side wall portion welded to the shadow mask 3 and a bottom portion formed by bending at the side wall portion, and the bottom portion is generally kept parallel to the panel 1.

When the electron beam is influenced by an external geomagnetism, the movement path is bent to reduce color purity, and the inner shield 9 is configured to be additionally affected by the geomagnetism.

Recently, as a part of strengthening the competitiveness of cathode ray tube, the cathode ray tube has been slimmed down. The slim structure of cathode ray tube has a structurally unstable shape, but its quality should be improved compared to the existing one, and thus the mechanical type with the panel of the frame The problem of compositing, halation, shadows on the screen and howling problems should be solved.

In relation to the above quality, the problem of shadowing and the halation problem on the screen during overscanning may be caused in particular by the shape of the side wall and the bottom of the frame 6.

Since the bottom surface of the frame 6 is formed inward toward the central axis of the panel 1 in parallel with the panel 1, the path of the electron beam can be disturbed along the length of the width of the inner surface. The length of the width may be excessively long, or the length of the width may be excessively short, and the electron beam may be reflected after colliding with the side wall of the frame to reach the fluorescent surface, thereby causing a problem due to the halation phenomenon.

In addition, when the cathode ray tube is made slim, the angle at which the electron beam is deflected toward the panel 1 increases from the deflection center at which deflection is started by the deflection yoke 5, so that the deflection angle is improved. In conjunction with this enlargement, the height of the side wall portion of the frame 6 and the width of the bottom portion should be appropriately changed.

However, in the related art, the cathode ray tube is made slimmer, and thus the path of the electron beam is shortened. Accordingly, the angle at which the electron beam is deflected in the deflection yoke increases. By using the shape of the conventional frame as it is, it is not possible to improve the problem that the shadow is formed on the screen or the halation phenomenon as described above.

The present invention has been made to solve the above problems of the prior art, by changing the length of the bottom portion of the frame supporting the shadow mask as the distance from the deflection center to the glass end of the panel due to the slimming of the cathode ray tube The present invention provides a cathode ray tube that can prevent shadows and halation from occurring on a screen by changing the size of the openings formed inside the bottom of the frame.

Cathode ray tube according to the present invention for solving the above problems, the outer surface is almost flat and the inner surface has a predetermined curvature, a funnel coupled to the back of the panel, a plurality of through-holes are formed to select the electron beam A cathode ray tube including a shadow mask and a frame for supporting the shadow mask, wherein the frame includes a sidewall portion to which the shadow mask is welded, and a bottom portion formed by bending at an end of the sidewall portion, and the center axis of the panel. The distance from the deflection center, which is the point at which the electron beam emitted accordingly starts to deflect, from the end of the skirt of the panel to the foot of the waterline perpendicular to the central axis is L, and is formed by each part of the bottom of the frame. An end of the bottom of the frame parallel to the long axis of the frame at a central point that is the center of the opening When referred to the distance to Dx, the cathode ray tube is characterized in that the values of Dx and L satisfies the equation 1.80 ≤ Dx / L ≤ 2.52.

Preferably, the distance from the center point to the end of the bottom portion of the v frame parallel to the short axis of the frame is referred to as Dy, and the distance from the center point to the end of the bottom portion of the frame parallel to the diagonal axis of the frame is Dd. In this case, the cathode ray tube is such that the values of Dy, Dd, and L further satisfy the conditions of 0.90 ≦ Dy / L ≦ 1.41 or 1.99 ≦ Dd / L ≦ 3.04.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. At this time, since the basic structure and operation of the cathode ray tube are the same as the above-described prior art, a detailed description thereof will be omitted.

2 is a perspective view of a frame used in the cathode ray tube according to the present invention, in which the major axis (x), minor axis (y) and diagonal axis (d) of the frame are shown.

The frame 6 is composed of a side wall portion 6a welded to the skirt portion of the mask formed by being vertically bent past the hole of the shadow mask and a bottom portion 6b formed by bending at the end of the side wall portion. In addition, the end of the bottom portion is formed by bending at a predetermined angle.

Since the openings formed by the sides of the bottom portion 6b of the frame have a rectangular shape, the axis parallel to the long side of each side is called the long axis x and the axis parallel to the short side is y, An axis formed by connecting two opposite corners of the opening may be defined as a diagonal axis d.

Figure 3 is a perspective view showing the width of the opening of the frame of the cathode ray tube according to the present invention, the distance from the end of the bottom portion 6b of the frame parallel to the long axis at the center point (o) of the center of the opening In this way, the distance from the center point o to the end of the bottom portion 6b of the frame parallel to the short axis and the diagonal axis in this manner is referred to as Dy and Dd, respectively.

Accordingly, the width of the opening 6 formed by each side of the bottom portion 6b according to the change of the length of the width of the bottom portion 6b along each axis is formed in the frame 6 formed by the outer side wall portion. The lengths of Dx, Dy, and Dd change.

4 is a cross-sectional view showing the deflection center of the cathode ray tube according to the present invention.

The electron beam emitted from the electron gun has a predetermined angle θ by a deflection yoke located near the neck of the funnel, and is deflected toward the fluorescent surface 4 coated on the inner surface of the panel 1, and the electron beam is deflected to the center of deflection ( deflection begins at n).

In addition, in order for the cathode ray tube to realize an image without distortion, the electron beam must be deflected at the deflection center n to pass through the outermost through hole of the shadow mask 3 so that the fluorescent surface 4 can emit light. In addition to the influence of the structure of the bottom portion 6b of the frame 6, the deflection center from the deflection center n to the outermost through hole of the shadow mask 3 and the deflection center with respect to the center axis of the panel ( The length of the gap between n) and the panel 1 affects the electron beam hitting the fluorescent surface 4 correctly.

Due to the slimming of the cathode ray tube, the distance on the central axis from the deflection center n to the panel 1 is shortened, and the panel 1 is bent perpendicularly to the outer surface of the panel at the end of the outer glass. A skirt portion is formed, and the end of the skirt portion is joined to the end surface of the funnel through the process.

4 shows the panel 1 and the shadow mask 3 cut along the major axis direction x, and a line connecting the center point of the panel 1 and the deflection center n is illustrated in the panel (1). It is the central axis of 1), the foot of the waterline perpendicular to the central axis in the longitudinal end surface of the skirt portion of the panel 1 corresponds to the m point.

Accordingly, the distance from the deflection center n to the m of the waterline can be expressed as L.

In addition, the vertical distance from the end of the bottom portion 6b of the frame to the central axis in parallel with the long axis of the frame is represented by Dx, as described above, the center axis and the bottom portion 6b along each axis of the frame. The distances to the ends of) are Dy and Dd, respectively.

As the cathode ray tube becomes slim and the distance L from the deflection center n to the end surface of the skirt portion of the panel 1 is shortened, the lengths (Dx, Dy, and Dd) of the width of the opening are required. This is explained with reference.

Invention 1 Invention 2 Invention 3 Inventive 4 Invention L (mm) 92 96 134.2 144 240.5 Dx (mm) 232.0 234.0 255.4 259.0 277.0 Dy (mm) 130.0 125.8 138.2 130.0 148.9 Dd (mm) 279.5 272.2 296.3 286.0 319.8 Dx / L 2.52 2.44 1.90 1.80 1.15 Dy / L 1.41 1.31 1.03 0.90 0.62 Dd / L 3.04 2.84 2.21 1.99 1.33

The data in Table 1 is a value applied when the cathode ray tube is 32 inches, and the data may be applied to a cathode ray tube having a similar size of 28 inches to 32 inches and may have a desirable effect.

In the case of the conventional cathode ray tube, since the shape is slim and not implemented, the center axis distance (L) from the deflection center to the end surface of the panel has a value of about 240 mm, but in the present invention 1 according to the slim cathode ray tube The central axis distance L has a value of about 92 mm, and in the present invention 4, the central axis distance L is formed with a value of about 144 mm.

In setting the width of the opening according to the slimming structure of the cathode ray tube, the distances (Dx, Dy, Dd) between the central axis and the end of each axis of the bottom portion of the frame are 232.0 mm, 130.0 mm, and 279.5, respectively. mm, and the present invention 4 was formed in 259.0mm, 130.0mm, 286.0mm respectively.

Accordingly, the value of the opening width (D / L) relative to the distance from the deflection center to the end surface of the panel is 2.52, 1.41, 3.04 in the present invention 1 along each axis, and 1.80, 0.90 in the present invention 4, respectively. , 1.99 is formed to increase the value of the ratio of the distance compared to the prior invention.

The width (D / L) of the opening width to distance to the end surface of the panel according to the data of the embodiment is 1.80 ≦ Dx / L ≦ 2.52, 0.90 ≦ Dy / L ≦ 1.41, 1.99 ≦ The shadow problem and the halation problem can be prevented by satisfying Dd / L ≦ 3.04.

5 is a cross-sectional view showing the structure of the cathode ray tube according to the embodiment compared with the conventional structure.

According to Figure 5 in the case of the present invention, in the slim cathode ray tube L value along each axis is reduced compared to the conventional L 'value, whereby the position of the deflection center (n) according to the present invention is conventional (n' ) Closer to the panel 1, and the angle θ at which the electron beam is deflected from the deflection center toward the shadow mask is also larger than the conventional deflection angle θ '.

As a result, when the conventional frame (solid line) is applied as it is or excessively lengthens the bottom portion, the electron beam does not collide with the halation problem or the fluorescent surface that is reflected toward the panel after colliding with the side wall portion 6a of the frame. Since the problem of shadows may occur, the above problems can be solved by constructing the frame 6 (dotted line) to have a range according to the present invention.

6 is a cross-sectional view showing the degree of slimming of the cathode ray tube. The present invention is to change the length of the width of the bottom portion of the frame according to the slimming degree of the slim cathode ray tube to appropriately change the length of the width of the opening formed in the bottom portion to solve the shadow problem and the halation problem. Because of its preventable effect, it is more effective for slim cathode ray tubes that must provide high quality images despite structurally unstable shapes.

According to FIG. 6, the distance from the deflection center n, which is the point at which the electron beam starts to deflect, to the center P of the outer surface of the panel 1 is referred to as H, and the panel 1 from the center P of the outer surface of the panel. The distance to the effective surface diagonal end of

In this case, when the H and W values satisfy {tan} ^ {-1} (W / H) ≥ 1.05, the cathode ray tube has a deflection angle (α * 2) from the deflection center (n) to both diagonals of the panel. This shows a cathode ray tube of about 120 degrees or more, and as described above, the frame for the cathode ray tube according to the present invention is more effective in the above-described slim cathode ray tube.

On the other hand, in the case where the cathode ray tube is made slim as described above, the deflection angle must be increased to widen the deflection range in order for the electron beam to be deflected from the deflection center to reach the fluorescent surface coated on the inner surface of the panel as a whole. As the current value required for the deflection increases, power consumption is increased.

Therefore, in order to solve the above problem, in the case of a slim cathode ray tube, a method of lowering a current value required for electron beam deflection may be applied by forming the yoke portion of the funnel, which is a region in which the deflection yoke is mounted, in a substantially rectangular shape.

As described above, the cathode ray tube according to the present invention has been described with reference to the illustrated drawings, but the present invention is not limited by the embodiments and drawings disclosed herein, and those skilled in the art are within the scope of the technical idea of the present invention. Application is possible.

When the cathode ray tube configured as described above has a structurally unstable shape by slimming the cathode ray tube by changing the width of an opening formed by the bottom portion by improving the structure of the bottom portion of the frame according to the structural change caused by the slimming of the cathode ray tube. In addition, the electron beam does not reach the fluorescent surface coated on the inner surface of the panel due to collision with the frame, so that the problem that the shadow appears on the screen can be solved, there is an effect that can provide a high quality slim cathode ray tube.

Claims (11)

Cathode rays including a panel having an outer surface substantially flat and having a predetermined curvature, a funnel coupled to a rear surface of the panel, a shadow mask for forming a plurality of through holes to select electron beams, and a frame for supporting the shadow mask. In the tube, the frame is composed of a side wall portion to which the shadow mask is welded, and a bottom portion formed by bending at the end of the side wall portion, The distance from the deflection center which is the point where the electron beam emitted along the central axis of the panel starts to deflect from the end of the skirt portion of the panel to the foot of the waterline perpendicular to the central axis is referred to as L, and the bottom of the frame When the distance from the center point, which is the center of the opening formed by each side, to the end of the bottom portion of the frame parallel to the long axis of the frame is Dx, the cathode ray tube satisfies the following equation: Cathode ray tube, characterized in that configured to. 1.80 ≤ Dx / L ≤ 2.52 The method of claim 1, The cathode ray tube is a cathode ray tube characterized in that when the distance from the center point to the end of the bottom portion of the frame in parallel to the short axis of the frame Dy, the Dy and L values further satisfy the following equation. . 0.90 ≤ Dy / L ≤ 1.41 The method of claim 1, The cathode ray tube is a cathode ray tube characterized in that when the distance from the center point to the end of the bottom portion of the frame parallel to the diagonal axis of the frame is Dd, the values of Dd and L further satisfy the following equation. . 1.99 ≤ Dd / L ≤ 3.04 Cathode rays including a panel having an outer surface substantially flat and having a predetermined curvature, a funnel coupled to a rear surface of the panel, a shadow mask for forming a plurality of through holes to select electron beams, and a frame for supporting the shadow mask. In the tube, the frame is composed of a side wall portion to which the shadow mask is welded, and a bottom portion formed by bending at the end of the side wall portion, The distance from the deflection center which is the point where the electron beam emitted along the central axis of the panel starts to deflect from the end of the skirt portion of the panel to the foot of the waterline perpendicular to the central axis is referred to as L, and the bottom of the frame When the distance from the center point, which is the center of the opening formed by each side, to the end of the bottom portion of the frame in parallel with the short axis of the frame, is Dy, the cathode ray tube satisfies the following equation: Cathode ray tube, characterized in that configured to. 0.90 ≤ Dy / L ≤ 1.41 The method of claim 4, wherein The cathode ray tube is a cathode ray characterized in that when the distance from the center point to the end of the bottom portion of the frame in parallel to the diagonal axis of the frame is Dd, the values of Dd and L further satisfy the following equation. tube. 1.99 ≤ Dd / L ≤ 3.04 Cathode rays including a panel having an outer surface substantially flat and having a predetermined curvature, a funnel coupled to a rear surface of the panel, a shadow mask for forming a plurality of through holes to select electron beams, and a frame for supporting the shadow mask. In the tube, the frame is composed of a side wall portion to which the shadow mask is welded, and a bottom portion formed by bending at the end of the side wall portion, The distance from the deflection center which is the point where the electron beam emitted along the central axis of the panel starts to deflect from the end of the skirt portion of the panel to the foot of the waterline perpendicular to the central axis is referred to as L, and the bottom of the frame When the distance from the center point, which is the center of the opening formed by each side, to the end of the bottom portion of the frame in parallel to the diagonal axis of the frame is Dd, the cathode ray tube has the following equation: Cathode ray tube, characterized in that configured to satisfy. 1.99 ≤ Dd / L ≤ 3.04 The method of claim 6, The cathode ray tube is a distance from the center point to the end of the bottom surface of the frame parallel to the long axis of the frame is Dx, and the distance from the center point to the end of the bottom portion of the frame parallel to the short axis of the frame is Dy. The cathode ray tube, characterized in that the value of Dx, Dy and L is further satisfied with the following equation. 1.80 ≤ Dx / L ≤ 2.52, 0.90 ≤ Dy / L ≤ 1.41 The method according to any one of claims 1 to 7, The cathode ray tube is a distance from the deflection center, which is the point at which the electron beam starts to deflect, to the center of the outer surface of the panel, and the distance from the center of the outer surface of the panel to the diagonal end of the effective surface of the panel is W. A cathode ray tube, wherein H and W values satisfy the following equation.  {tan} ^ {-1} (W / H) ≥ 1.05 The method according to any one of claims 1 to 7, The cathode ray tube is a cathode ray tube, characterized in that the distance (L) from the deflection center to the foot of the waterline lowered perpendicularly to the central axis at the end of the skirt portion of the panel satisfies the following equation. 92mm ≤ L ≤ 144mm The method of claim 9, The cathode ray tube is a cathode ray tube, characterized in that applied to 28 to 32 inch cathode ray tube. The method according to any one of claims 1 to 7, The cathode ray tube is a cathode ray tube, characterized in that the vertical cross-sectional shape of the funnel yoke portion is formed almost square.

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