KR100505944B1 - Flat panel for a cathode ray tube - Google Patents

Abstract

The present invention discloses a cathode ray tube panel which can be reduced in weight by improving the shape of the blend round portion. In the cathode ray tube panel of the present invention, a face portion for displaying an image, a skirt portion extending rearward from the edge of the face portion, and a blend round portion connecting the face portion and the skirt portion, the outer contour of the face portion and the blend round portion The point where the outer blend round outline meets is called the first point, the point where the outer outline of the skirt meets the outer blend round outline of the blend round part is called the second point, and the outer blend round outline defines the first point and the second point. The imaginary arc is formed between an imaginary arc each having its two end points and a line segment having its first and second points respectively, or a segment having both the first and second points having its respective endpoints. Smoothly connected at the first point with the outer contour of the face and smoothly at the second point with the outer contour of the skirt And that is characterized. According to the present invention, the shape of the blend round part is improved to satisfy the explosion-proof characteristics of the International Electrotechnical Commission and the moldability of press molding, and the weight of the panel can be reduced.

Description

Panel for cathode ray tube {FLAT PANEL FOR A CATHODE RAY TUBE}

The present invention relates to a cathode ray tube panel, and more particularly to a cathode ray tube panel which can be reduced in weight by improving the shape of the blend round portion.

As is well known, glass bulbs used in the manufacture of color televisions, computer monitors, etc. are basically three components: a panel through which images are projected, and a rear surface of the panel. Conical funnel (Funnel) to be joined, and a tubular neck (Neck) bonded to the vertex of the funnel. Panels, funnels and necks are all made of glass, and in particular panels and funnels are produced by press molding a molten glass mass called glass gob to a desired size and shape. Panel is manufactured as a finished product through pin sealing process for sealing stud pin after press molding and slow cooling process in annealing lehr to remove stress remaining on the panel by heat treatment. Doing.

Referring to FIG. 1, the structure of the glass bulb for the cathode ray tube is described. The panel 20 of the glass bulb 10 includes a face portion 21 having an imaging phosphor coated on an inner surface thereof to display an image; A skirt portion 23 having a skirt edge 23 extending rearward from an edge of the face portion 21 and a blend round connecting the face portion 21 and the skirt portion 23. It consists of a portion (Blend round portion) 24. The blend round portion 24 is also referred to as fillet, which means a portion where the contours of the face portion 21 and the skirt portion 23 are shaped into smooth curved surfaces. A mold match line 25 is formed on the inner surface of the skirt portion 23 of the panel 20 by molding marks generated by the interface between the lower mold and the intermediate mold.

The funnel 30 has a body portion 32 having a thread edge 31 bonded to the thread edge 22 of the panel 20, and a yoke portion extending behind the body portion 32. portion 33). The neck 40 is joined to the yoke portion 33 of the funnel 30.

In recent years, for the cathode ray tube panel, many studies are being actively conducted to reduce the thickness and weight of the glass bulb to reduce the cost.

Particularly, in the conventional glass bulb for cathode ray tube, a design method of reducing the thickness of the face portion or reducing the height of the skirt portion is implemented to reduce the weight of the flat panel. The method is not being implemented.

SUMMARY OF THE INVENTION An object of the present invention is to provide a cathode ray tube panel that can reduce the weight of the panel more effectively by improving the shape of the blend round portion.

Another object of the present invention is to provide a panel having a shape of a blend round part that can ensure explosion-proof characteristics and formability of press molding of the International Electrotechnical Commission.

A feature of the present invention for achieving the above object, in the cathode ray tube panel, a face portion for displaying an image, a skirt portion extending rearward from the edge of the face portion, and a blend round portion connecting the face portion and the skirt portion The point where the outer contour of the face portion and the outer blend round contour of the blend round portion meet is called the first point, and the point where the outer contour of the skirt portion and the outer blend round outline of the blend round portion meet the second point, and the outer blend round contour Is formed between an imaginary arc having first and second points as its end points and a line segment having first and second points as its end points, respectively; It is a line segment with both end points, and the imaginary arc is connected smoothly at the first point with the outer contour of the face part, and the skirt part is The outer contour and the second point is characterized in that the smooth connection.

Hereinafter, a preferred embodiment of the cathode ray tube panel according to the present invention will be described in detail with reference to the accompanying drawings.

First, referring to FIG. 2, the cathode ray tube panel 50 of the present invention has a face portion 51 on which an imaging phosphor is coated on an inner surface thereof to display an image, and extends backward from an edge of the face portion 51. The skirt part 53 which has the thread edge 52 which exists, and the blend round part 54 which connect the face part 51 and the skirt part 53 are comprised. A mold match line 55 is formed on the outer surface of the skirt portion 53 of the panel 50 by molding marks generated by the interface between the lower mold and the intermediate mold.

As shown in FIG. 3, the panel 50 is formed in a substantially rectangular shape having a short axis 56, a long axis 57, and a diagonal axis 58. The face portion 51 may be divided into a face center region 60 that constitutes a useful screen 59 for displaying an image, and a face peripheral region 61 around the face.

2 and 3, reference numeral Tc denotes the thickness of the panel 50 at the center of the face portion 51, that is, the center face thickness Tc (mm). The sign Td denotes the diagonal effective screen thickness Td (mm), and the diagonal effective screen thickness Td (mm) is blended with the inner contour 51a of the face part 51 in the diagonal axis 58 direction. The thickness of the panel 50 at the contact point where the inner blend round contour 54a of the round portion 54 is in contact with each other. In the face peripheral area 61 of the face part 51, the contact point between the inner contour 51 a of the face part 51 and the inner blend round outline 54 a of the blend round part 54 is the thickest in the panel 50. Thick spot.

4, the cathode ray tube panel 50 according to the first embodiment of the present invention will be described. First, an imaginary round line 54c for obtaining an outer blend round contour 54b of the blend round part 54 connecting the face part 51 and the skirt part 53 of the panel 50 is obtained. Obtain Herein, the radius of curvature R ₁ of the virtual round line 54c may be obtained in the same manner as the radius of curvature of the outer blend round outline of the existing blend round part 24 illustrated in FIG. 1, and the existing blend round The radius of curvature of the outer blend round outline of the part 24 varies depending on the type of cathode ray tube, but the flat panel of the 17 inch to 32 inch cathode ray tube is typically about 8 to 15 mm. The rounded line having a radius of curvature of about 8 to 15 mm has a characteristic value of about 0.419 to 0.429.

Next, the first point A where the outer contour line 51b of the face portion 51 and the virtual round line 54c meets is obtained, and the outer contour line 53b of the skirt portion 53 and the virtual round line ( Find the second point (B) where 54c) meets. The first point A where the outer contour line 51b of the face portion 51 and the virtual round line 54c meet does not invade the effective screen 59, and the outer contour line 53b of the skirt portion 53 The second point B where the virtual round line 54c meets does not invade the mold match line 55 based on the blend round portion 54. In addition, the imaginary rounded line 54c bends with the outer outline 51b of the face part 51 and the outer outline 53b of the skirt part 53 at the 1st point A and the 2nd point B, respectively. Meets smoothly without this. That is, the graph formed by the outer contour line 51b of the face part 51, the imaginary round line 54c, and the outer contour line 53b of the skirt portion 53 is the first point A and the second point B. FIG. ) Has a derivative at. Then, the first straight line L ₁ connecting the first point A and the second point B is obtained, and the second straight line L ₂ having the same slope as the first straight line L ₁ is obtained. At this time, the second straight line L ₂ does not deviate from the vertex C of the first straight line L ₁ and the round line 54c. When the second straight line L ₂ is obtained as described above, the outer blend of the blend round portion 54 connecting the first point A and the second point B and the vertex of which is in contact with the second straight line L ₂ is obtained. A round 54d having a round outline 54b is formed.

In addition, as shown in FIG. 5, the radius of curvature R ₂ (mm) of the round 54d between the first point A and the second point B portion is

It is preferable to form so as to satisfy. The outer contour 51b of the face portion 51 and the outer contour 53b of the skirt portion 53 are smoothly connected to the outer blend round contour 54b by the round 54d having the radius of curvature R ₂ . This ensures the formability of the press molding, and can effectively prevent breakage due to concentration of stress.

On the other hand, as shown in Figure 6, the characteristic value (rho; ρ) of the conical curve (Conic section: Cs) including a circle, ellipse, parabola, hyperbola can be obtained by the following equation (2).

Where D ₁ is the length of the repair line between the base (ab) of the cone (Cone: Co) and the vertex (d) of the cone curve (Cs), and D ₂ is the length of the base (ab) and cone (Co) of the cone (Co). The length of the repair line between the vertices c is shown. In addition, the comb side ac and the comb side bc of the cone Co are a part of the tangent which contact | connects a cone curve at the points a and b, respectively.

  In particular, the arc can be expressed as follows.

Here, θ is a center angle for the arc, that is, the angle between the start point of the arc and the center of the circle including the arc and the end point of the arc.

In the panel 50 of the present invention, the characteristic value ρ of the conical curve of the outer blend round outline 54b of the blend round portion 54 connecting the face portion 51 and the skirt portion 53 is

It is desirable to be designed to satisfy. When the characteristic value rho of the cone curve of the blend round outline 54b is smaller than 0.44, which is the minimum value, the weight reduction effect is very low. That is, the weight reduction rate is less than 0.9%. On the other hand, if the characteristic (rho) of the conical curve of the blend round contour 54b exceeds 0.5, which is the maximum value, a concave curve is formed so that the first point A and the second point B become sharp, and thus the panel 50 ) The probability of breakage during movement or installation of explosion-proof band increases, and the explosion-proof strength deteriorates due to the concentration of vacuum stress. Further, when the cone curve characteristic value of the blend round outline 54b is 0.5, an outline close to a straight line is formed.

In order to verify the weight reduction rate of the panel according to the first embodiment of the present invention, an experiment was performed and the results are shown in Table 1. In Table 1, Comparative Examples 1 to 8 are conventional 17- to 32-inch panels having the same structure, except for the panel 50 and the blend-round portion 54 of the present invention shown in FIGS. 2 and 3. It is a panel. Examples 1 to 8 is a panel manufactured to satisfy Equations 1 to 4 based on each of the panels of Comparative Examples 1 to 8. In Table 1, the weights of the panels were measured and the weight loss ratios indicate the reduction ratios of the panel weights of Examples 1 to 8 with respect to the panel weights of Comparative Examples 1 to 8.

division Cathode ray tube model Characteristic value of cone curve (ρ) Weight (g) Weight loss rate (%) shorten Long axis Diagonal axis Comparative Example 1 17 ″ 0.428 0.429 0.429 6549.4 - Comparative Example 2 19 ″ A 0.428 0.428 0.428 8965.0 - Comparative Example 3 19 ″ B 0.428 0.429 0.429 8841.1 - Comparative Example 4 21 ″ 0.419 0.419 0.421 11643.8 - Comparative Example 5 25 ″ 0.425 0.425 0.426 14463.7 - Comparative Example 6 28 ″ 0.423 0.423 0.425 17321.7 - Comparative Example 7 29 ″ 0.425 0.425 0.425 21880.8 - Comparative Example 8 32 ″ 0.425 0.425 0.425 26625.4 - Example 1 17 ″ 0.499 0.499 0.499 6413.0 2.1 Example 2 19 ″ A 0.499 0.499 0.499 8807.2 1.7 Example 3 19 ″ B 0.499 0.499 0.499 8704.0 1.5 Example 4 21 ″ 0.499 0.499 0.499 11442.9 1.7 Example 5 25 ″ 0.499 0.499 0.499 14339.4 0.9 Example 6 28 ″ 0.499 0.499 0.499 17174.0 0.9 Example 7 29 ″ 0.499 0.499 0.499 21611.8 1.2 Example 8 32 ″ 0.499 0.499 0.499 26231.9 1.5

As can be seen from Table 1, in the panels of Comparative Examples 1 to 8, it can be seen that the characteristic value (ρ) of the conical curve of the outer blend round outline in the short axis, the major axis and the diagonal axis is smaller than 0.44. . In addition, the 17 inch to 32 inch panels of Examples 1 to 8 were manufactured so that the conical curve characteristic value (rho) of the outer blend round outline was 0.499. It can be seen that weight loss of 0.9 to 2.1% of the weight occurred. In addition, the 17- to 32-inch panels of Examples 1 to 8 having outer blend round outlines having a conical curve characteristic value (rho) in a range of 0.44 ≤ rho ≤ 0.5 exhibit explosion-proof characteristics of the International Electrotechnical Commission. It has a satisfactory strength and ensures formability of press forming.

7 and 8, a cathode ray tube panel 50 according to a second embodiment of the present invention will be described. First, the first point A and the second point B are obtained in the same manner as in the first embodiment, and the first straight line L ₁ connecting the two points is obtained. Here, the section between the first point A and the second point B of the first straight line L ₁ , that is, the line segment AB forms the outer blend round outline 54b of the blend round part 54. In other words, an outer blend round outline 54b having a shape such as chamfering the conventional blend round part is formed.

In addition, as shown in FIG. 8, as shown in FIG. 8, the portion where the first point A and the second point B meet the outer blend round outline 54b is a round 54d having a radius of curvature of 1 mm or more. Is preferably connected.

The outer blend round outline 54b may be a line segment between two points where the second straight line L ₂ (see FIG. 4) and the virtual round line 54c meet.

As in the third embodiment of the present invention shown in Figs. 9 and 10, the outer blend round outline 54b can be formed with two or more line segments. 9 and 10, a cathode ray tube panel 50 according to a third embodiment of the present invention will be described. First, the first point A, the second point B, the first straight line L ₁ and the second straight line L ₂ are obtained in the same manner as in the first temporary example. The outer blend round outline 54b according to the present embodiment has the first point A and the second straight line when any point on the second straight line in the outer blend round outline is the third point D. And a third straight line connecting the third point D on (L ₂ ) and a fourth straight line connecting the second point B and the third point D. FIG.

In addition, as shown in FIG. 10, as shown in FIG. 10, a portion where the first point A and the second point B meet the outer blend round outline 54b has a round radius of curvature of 1 mm or more. 54d). In addition, it is preferable to replace the 3rd point D which two line segments meet with the round 54e so that curvature radius may become a curve of 1 mm or more, for example.

In addition, the outer blend round outline 54b connects one or more curves or two or more line segments and the second point B and the third point D connecting the first point A and the third point D. It may be composed of one or more curves or two or more line segments, and may be formed in a mixture of curves and line segments.

The embodiments described above are merely to describe preferred embodiments of the present invention, the scope of the present invention is not limited to the described embodiments, those skilled in the art within the spirit and claims of the present invention It will be understood that various changes, modifications, or substitutions may be made thereto, and such embodiments are to be understood as being within the scope of the present invention.

As described above, in the cathode ray tube panel according to the present invention, since the blend round portion is formed so that the outer blend round contour is formed inward as compared with the conventional one, the panel can be reduced in weight, and in particular, the conical curve characteristics of the outer blend round contour Since the value is formed to be 0.44 or more and 0.5 or less, it is possible to effectively reduce the weight and at the same time satisfy the explosion-proof characteristics of the International Electrotechnical Commission and the moldability of press molding.

In addition, since the point where the outer blend round outline meets the outer contour of the face and the point where the outer blend round outline meets the outer contour of the skirt is connected by a round having a radius of curvature of about 1 mm or more, the probability of panel failure Can be greatly reduced.

In addition, since the position where the outer blend round outline meets the outer contour of the face portion and the outer blend round outline meets the outer contour of the skirt portion can be made the same as that of the conventional panel, the outer blend loudspeaker of the panel of the present invention Even if the contour is different from that of the conventional panel, the mounting area of the existing explosion-proof band can be used as it is in the production of cathode ray tubes, and the same case as in the conventional case can be used in the manufacture of the TV or monitor.

1 is a cross-sectional view showing the configuration of a glass bulb for a typical cathode ray tube,

2 is a cross-sectional view showing the configuration of a cathode ray tube panel according to the present invention;

3 is a front view showing the configuration of a cathode ray tube panel according to the present invention;

4 is a view illustrating a method of forming an outer blend round outline of the blend round part in the cathode ray tube panel according to the first embodiment of the present invention;

5 is a view illustrating a method of forming a round connecting the face portion and the skirt portion with the outer blend round outline of the blend round portion in the cathode ray tube panel according to the first embodiment of the present invention;

FIG. 6 is a view illustrating characteristic values of a conical curve for forming an outer blend round outline of a blend round part according to the present invention; FIG.

7 is a view illustrating a method of forming an outer blend round outline of a blend round part in a cathode ray tube panel according to a second embodiment of the present invention;

8 is a view illustrating a method of forming a round connecting a face portion and a skirt portion with an outer blend round outline of a blend round portion in a cathode ray tube panel according to a second embodiment of the present invention;

FIG. 9 is a view illustrating a method of forming an outer blend round outline of a blend round part in a cathode ray tube panel according to a third exemplary embodiment of the present invention; FIG.

FIG. 10 is a view illustrating a method of forming a round connecting a face portion and a skirt portion with an outer blend round of a blend round portion and a round point connecting line segments in a cathode ray tube panel according to a third exemplary embodiment of the present invention. to be.

<Description of Symbols for Main Parts of Drawings>

50: panel 51: face part

52: thread edge 53: skirt portion

54: Blend Round Part 54a: Inner Blend Round

54b: outer blend round 54c: imaginary round line

54d: Round 59: Valid Screen

60: face center area 61: face area

Tc: Face center thickness Td: Diagonal effective screen thickness

R: outer curvature radius A: first point

B: second point C: vertex

Co: Cone Cs: Cone

L ₁ : first straight line L ₂ : second straight line

Claims (14)

In the cathode ray tube panel, Face part which displays picture, A skirt portion extending rearward from an edge of the face portion, A blend round part connecting the face part and the skirt part, The point where the outer contour of the face portion and the outer blend round contour of the blend round portion meet is called a first point, and the point where the outer contour of the skirt portion and the outer blend round outline of the blend round portion meet a second point, The outer blend round outline is formed between an imaginary arc having the first point and the second point as both end points, and a line segment having the first point and the second point as both end points, respectively. The virtual arc is smoothly connected at the first point with the outer contour of the face portion, and smoothly connected at the second point with the outer contour of the skirt portion. Panel for cathode ray tube, characterized in that. The method of claim 1, The radius of curvature of the imaginary arc is about 8 mm or more and 15 mm or less Panel for cathode ray tube, characterized in that. The method of claim 2, Wherein the outer blend round contour is a second line segment that is parallel to the line segment and meets the arc at two points. Panel for cathode ray tube, characterized in that. The method of claim 1, The outer blend round outline is a cone Panel for cathode ray tube, characterized in that. The method of claim 4, wherein The cone curve characteristic value of the cone curve is about 0.44 or more and 0.5 or less Panel for cathode ray tube, characterized in that. delete delete delete delete delete delete A face portion for displaying an image, a skirt portion extending rearward from an edge of the face portion, and a blend round portion connecting the face portion and the skirt portion, wherein the outer contour of the face portion and the outer blend round contour of the blend round portion are included. In the cathode ray tube panel wherein this meeting point is referred to as a first point, and a point where an outer contour line of the skirt section and an outer blend round contour line of the blend round section meet as a second point, Obtaining a first straight line connecting the first point and the second point and a second straight line parallel to the first straight line so as not to deviate from the vertex of the outer blend round contour, and having the same slope, A third straight line connecting the first point and a third point which is an arbitrary point on the second straight line in the outer blend round contour, and a fourth straight line connecting the third point and the second point on the second straight line. Making connections to the outer blend round contour of the blend round portion Panel for cathode ray tube, characterized in that. The method of claim 12, The third point where the first point and the second point and the third straight line and the fourth straight line meet is rounded to be a curve Panel for cathode ray tube, characterized in that. The method of claim 13, The radius of curvature of the curve formed by the round treatment is about 1mm or more Panel for cathode ray tube, characterized in that.