JP3826868B2 - Panel for cathode ray tube - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cathode ray tube panel, and more particularly to a technique for improving an alignment portion formed on a side portion of the panel.
[0002]
[Prior art]
As is well known, a cathode ray tube includes a panel on which an image is projected and a substantially funnel-shaped funnel as main glass parts. As shown in FIG. 4, the panel 1a has a substantially rectangular face portion 2a having an effective screen for displaying an image, and four side portions 4a connected to the face portion 2a via a blend R portion 3a. And the skirt part 5a is comprised from these edge parts 4a. And the seal edge surface 6a used for joining with the said funnel is formed in the opening end of this skirt part 5a (each side part 4a).
[0003]
On the outer surface of each of the side portions 4a, there are a mold match line 7a that is generated by mold matching of the press mold of the panel 1a and becomes the maximum outer diameter portion of the panel 1a, and a seal edge surface 6a from the mold match line 7a. A break line 8a serving as a boundary where the gradient of the outer surface changes is formed on the way to. Specifically, the outer surface of the region extending from the mold match line 7a to the break line 8a has a gradient (an inclination angle formed with a line parallel to the central axis Z) so as to be able to ensure good pull-out after press molding. In contrast to the minimum value, the outer surface of the region from the break line 8a to the seal edge surface 6a has a relatively large gradient as compared with the above case.
[0004]
By the way, as a cathode ray tube, in order to make it possible to display an appropriate image without color misregistration or the like, each central axis of the panel 1a and the funnel is a glass bulb tube obtained by sealing the two together. It is important that they are accurately positioned relative to each other and assembled. Therefore, the outer surfaces of the two adjacent side portions 4a of the panel 1a are brought into contact with a positioning jig when sealed with the funnel to determine the positioning between the funnel and the directionality of the panel 1a. A plurality of alignment portions 10a for performing are provided. The alignment portion 10a has a contact point (virtual reference point) 11a that serves as a reference with which the positioning jig abuts, and the contact point 11a is at a predetermined distance from the central axis X of the panel 1a. It is formed. In addition, this alignment part 10a is provided in a total of three places, two places of one side part 4a (long side part), and one place of the other side part 4a (short side part) adjacent to the one side. .
[0005]
This alignment section has a configuration as shown below in a conventional curved panel (a panel that occupies the mainstream before a flat panel described later is on the market). That is, as shown in FIG. 5, the curved panel 1b is advantageous in that the mold matching surface is not positioned on the curved face portion 2b. The break line 8b has a predetermined dimension that is determined in consideration of moldability (removability) or securing of an explosion-proof band winding area (winding width), and the like. It exists in the position spaced apart from the mold match line 7b to the seal edge surface 6b side.
[0006]
The alignment unit 10b preferably has a reference plane 12b having a contact point 11b as parallel as possible to the center axis Z of the panel so as not to cause a positioning error when the positioning jig is abutted. Therefore, the reference plane 12b is a part of the outer surface of the region from the mold match line 7b to the break line 8b where the gradient is set to the minimum necessary. And the alignment mark 13b which makes the rectangular-rod-shaped convex part which goes to the break line 8b side from the mold match line 7b is formed in the both sides of the direction along the mold match line 7b of the reference | standard plane 12b. The alignment mark 13b may be formed only on one side of the abutting point 11b.
[0007]
Further, as shown in FIG. 6, the reference plane 12b around the abutting point 11b constituting the alignment portion 10b is set as a part of the outer surface of the region from the mold match line 7b to the break line 8b in the same manner as described above. Alignment marks 13b for informing the presence of the reference plane 12b are also formed on both sides of the plane 12b (abutting point 11b) in the direction along the break line 8b. The alignment mark 13b is formed of a wedge-shaped convex portion (the tapered portion on the break line 8 side) that extends from the break line 8b toward the seal edge surface 6b. In this case, the curved panel 1b shown in FIG. 5 is 21 inches in size, and the curved panel 1b shown in FIG. 6 is 29 inches in size.
[0008]
The panel shown in FIG. 5 and FIG. 6 described above has been practiced by the applicant of the present invention, but there is no prior art document of a panel having such an alignment unit. However, as a prior art document showing a state in which the alignment portion is formed on the panel, there is the following Patent Document 1.
[0009]
[Patent Document 1]
JP 2001-110339 A
[0010]
[Problems to be solved by the invention]
By the way, in recent years, a panel (hereinafter, referred to as a flat panel) including a face portion that forms an effective screen having a radius of curvature of an outer surface on a diagonal axis of 10,000 mm or more has been widely used. The following problems were invited.
[0011]
That is, as shown in FIG. 7, in the flat panel 1c, the outer surface of the face portion 2c is hardly curved. Therefore, in consideration of moldability or product quality, the mold match line 7c has a face portion. The break line 8c is located at a position close to the outer surface of 2c, and the break line 8c is separated from the mold match line 7c toward the seal edge surface 6c by a predetermined dimension determined in consideration of moldability or securing of the winding area of the explosion-proof band. Will exist.
[0012]
Therefore, in this flat panel 1c, not only the mold match line 7c but also the break line 8c are moved away from the seal edge surface 6c as compared with the curved panel 1b described above. Nevertheless, the distance from the seal edge surface 6c to the reference plane 12c (strictly, the abutting point 11c) of the alignment portion 10c is desired to be the same as that of the curved panel 1c from the viewpoint of sharing the positioning jig. There is a request.
[0013]
For this reason, the reference plane 12c of the alignment part 10c must be a part of the outer surface of a relatively large gradient area closer to the seal edge surface 6c than the break line 8c. Therefore, if the conventional method of forming the alignment mark 13c (including a method different from that shown in the drawing) is employed, the inclination of the reference plane 12c is increased, so that the positioning jig A positioning error occurs at the time of abutting, which causes a problem in sealing with the funnel and a problem that the product yield decreases.
[0014]
In addition, according to the above-described Patent Document 1, it is disclosed that an alignment portion as a protrusion having a reference plane from the vicinity of the seal edge surface to the vicinity of the center portion in the width direction is formed on the outer side surface of the curved panel. ing.
[0015]
However, the publication does not mention that a break line exists on the side of the panel, and therefore some measures are taken for an area where the gradient from the break line to the seal edge surface is relatively large. This is not realized, and there still remains a possibility that a positioning error will occur when the positioning jig is abutted.
[0016]
In addition, since the peripheral edge of the reference plane protrudes from the outer surface of the side part over the entire circumference, this alignment part has a moldability such as the fluidity of the molten glass is hindered by the presence of the alignment part during press molding. Has a problem that wrinkles and cracks are more likely to occur.
[0017]
And since this panel is a curved panel, it is not necessary to assume the situation where a break line moves away from a seal edge surface like the above-mentioned flat panel. Therefore, if such a situation occurs, and how to respond to a request not to change the distance from the seal edge surface to the alignment part (abutting point), how to deal with it becomes a problem.
[0018]
The present invention has been made in view of the above circumstances, and realizes a configuration of an alignment unit that can appropriately cope with a long distance from a seal edge surface to a break line in a so-called flat panel, and at the time of sealing with a funnel It is a technical problem to reduce as much as possible the positioning error in the process and to suppress the deterioration of moldability and the occurrence of cracks due to the presence of the alignment portion.
[0019]
[Means for Solving the Problems]
In order to solve the above technical problem, the present invention provides a substantially rectangular face portion that forms an effective screen having a radius of curvature of an outer surface on a diagonal axis of 10000 mm or more, and a substantially right angle to the periphery of the face portion. And each side has an outer surface with a gradient increasing from the mold match line toward the seal edge surface, and at least two adjacent sides. In the cathode ray tube panel in which the alignment part is provided on the outer surface of the part, the alignment part is constituted by a protrusion having a reference plane extending from the outer surface of the region extending from the mold match line to the break line toward the seal edge surface side It is characterized by being.
[0020]
According to such a configuration, the reference plane of the protrusions constituting the alignment portion is the same surface (on the same surface) as the outer surface of the region extending from the mold match line to the break line, and is continuously sealed from the break line. In other words, the reference plane has no step between the mold match line and the outer surface of the region from the mold match line to the break line, and seals from the break line with the same gradient as the outer surface. Since it is directed toward the edge surface, the so-called flat panel targeted by the present invention can enjoy the following advantages.
[0021]
First, the flat panel mold match line is moved away from the seal edge surface compared to a curved panel for the purpose of improving moldability and product quality, etc., while optimizing moldability (removability) or winding area of explosion-proof band Even when the break line is further away from the seal edge surface than the curved panel for the purpose of optimizing the (rolling width), the alignment reference plane is formed from the break line toward the seal edge surface. And the gradient is set to be the same as that of the outer surface of the region from the mold match line to the break line, that is, the minimum necessary. As a result, the positioning jig used for sealing the flat panel and the funnel can be shared with the curved panel, and the positioning operation can be shared, and the gradient of the reference plane extends from the break line to the seal edge surface. Since it is not as large as the outer surface of the region, a positioning error hardly occurs when the positioning jig is brought into contact with the reference plane, and the product yield of the glass bulb and thus the cathode ray tube is improved.
[0022]
Secondly, one end of the reference plane of the protrusion that constitutes the alignment section is connected to the outer surface of the region from the mold match line to the break line in a flush manner, so that the periphery of the reference plane is all around. Compared with the case where it protrudes from the outer surface of the side portion, the flow of the molten glass to the periphery of the alignment portion is smoothed during press molding of the panel. As a result, the moldability of the panel is improved, and the probability of occurrence of wrinkles and cracks in the alignment portion and its periphery is reduced, so that the quality of the panel can be improved.
[0023]
Third, the abutting point against which the positioning jig is abutted exists at or near the reference plane of the protrusion constituting the alignment portion, and at the time of sealing with the funnel, the protrusion and the reference plane Since the presence can be recognized at a glance, an alignment mark for notifying the existence of the alignment portion (abutting point) becomes unnecessary. As a result, problems such as the occurrence of microcracks or microdefects inside the mark due to the formation of alignment marks made of rod-shaped or wedge-shaped projections as in the past, and product quality degradation due to this are caused. Avoided.
[0024]
In the above configuration, the alignment part is preferably formed in a region excluding the vicinity of the seal edge surface. Here, the “region excluding the vicinity of the seal edge surface” means a region excluding a range of 5 mm from the seal edge surface (preferably a range of 10 mm from the seal edge surface), or a break line and a seal edge surface from the seal edge surface. Means a region excluding the range of 1/3 of the separation distance between Therefore, the edge on the seal edge surface side of the alignment portion is separated from the seal edge surface by more than 5 mm (preferably 10 mm), or separated from the seal edge surface by more than 1/3 of the separation distance. Become. In this way, when the panel is placed on a table or plate such as a table with the seal edge surface facing downward, or when the placed panel is lifted, the alignment unit (protrusion) is placed on the table or plate. It is possible to avoid the possibility that damage such as chipping or cracking may occur due to contact of the end portion on the seal edge surface side. In addition, an alignment mark similar to the conventional one can be formed in a region near the seal edge surface in order to confirm the existence of the alignment portion. In other words, the area near the seal edge surface is an inconspicuous area compared to other areas, and the convex part is easily formed within the range that does not bulge out from the mold match line that forms the maximum outer diameter part. This is a region that can be used, and the region in the vicinity of the seal edge surface is effectively used for forming the alignment mark.
[0025]
In the above configuration, it is preferable that the reference plane of the alignment portion has a substantially rectangular shape. That is, in designing and manufacturing a molding surface corresponding to the alignment part of the panel molding die, it is advantageous to make the reference plane substantially rectangular rather than circular or other square shape. In addition, considering that one end of the reference plane is connected to the outer surface of the region from the mold match line to the break line in a flush manner, not only the above-described mold design and production, but also improved moldability In order to achieve this, it is advantageous that the reference plane has a substantially rectangular shape.
[0026]
In the above configuration, it is preferable that the stepped portion of the alignment portion is smoothly connected to the reference plane and the side outer surface via curved surfaces. If it does in this way, the flow of the molten glass with respect to the level | step-difference part of an alignment part and its periphery is smoothed at the time of the press molding of a panel. As a result, the moldability of the panel is improved, the probability of occurrence of wrinkles and cracks in the stepped portion of the alignment portion and its periphery is reduced, and the quality of the panel can be improved.
[0027]
In the above configuration, the formation of the alignment mark that informs the existence of the alignment portion can be abolished. In this way, as described above, the occurrence of microcracks or microdefects inside the mark due to the formation of the alignment mark composed of rod-shaped or wedge-shaped projections, and the quality of the product resulting from this. Problems such as degradation are avoided.
[0028]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0029]
FIG. 1 shows a cathode ray tube panel (hereinafter simply referred to as a panel) 1 according to a first embodiment of the present invention, and a left side portion of a central axis Z in FIG. 1 represents a direction along a major axis L as a horizontal direction. In addition, the portion indicated by the alternate long and short dash line on the right side of the central axis Z in the figure represents the direction along the short axis S as the left-right direction, and two points on the right side of the central axis Z in the figure A portion indicated by a chain line represents a direction along the diagonal axis D as a left-right direction (for the long axis L, the short axis S, and the diagonal axis D, refer to FIG. 4).
[0030]
The panel 1 according to the first embodiment is a 10-inch flat panel and has a substantially rectangular face portion 2 that forms an effective screen in which the radius of curvature of the outer surface 14 on the diagonal axis D is 10,000 mm or more. is doing. On the outer surface of each side portion 4 of the panel 1, as already described, a mold match line 7 that is generated by mold matching of the press molding die of the panel 1 and becomes the maximum outer diameter portion of the panel 1, A break line 8 is formed as a boundary where the gradient of the outer surface changes on the way from the mold match line 7 to the seal edge surface 6.
[0031]
Accordingly, the outer surface from the mold match line 7 of each side 4 to the seal edge surface 6 can be broadly divided into mold matches in which the gradient is set to the minimum necessary to ensure good pullability after press molding. A first region 15 that extends from the line 7 to the break line 8 and a second region 16 that extends from the break line 8 whose gradient is set to be larger than that of the first region 15 to the seal edge surface 6 are divided. The mold match line 7 of the panel 1 is formed at a position closer to the outer surface on the central axis Z of the face portion 2, in other words, a position away from the seal edge surface 6, as compared with the conventional curved panel. Has been. Accordingly, the break line 8 is also formed at a position away from the seal edge surface 6 as compared with the conventional curved panel. In addition, when this panel 1 and the curved panel 1b shown in FIG. 6 are compared, it seems that there is no great difference in the position of the mold match line and the break line, but the curved panel 1b shown in FIG. Therefore, the panel 1 is different in size. Therefore, in this panel 1, the positions of the mold match line 7 and the break line 8 are moved away from the seal edge surface 6 as compared with a curved panel having the same size.
[0032]
In the second region 16, an alignment portion 10 is formed that is a protrusion having a substantially rectangular reference plane 12 that continues from the first region 15. More specifically, the reference plane 12 of the alignment unit 10 is flush with the first region 15 and is formed continuously from the break line 8 toward the seal edge surface 6 side. Accordingly, the reference plane 12 and the first region 15 have the same gradient. The abutting point (virtual reference point) 11 of the positioning jig is set in the vicinity of the break line 8, specifically, a position slightly closer to the mold match line 7 of the break line 8.
[0033]
The alignment portion 10 is formed in a region excluding the vicinity of the seal edge surface 6. In this embodiment, the vicinity of the seal edge surface 6 is a range that occupies 1/3 of the separation distance A between the break line 8 and the seal edge surface 6 from the seal edge surface 6 or 5 mm from the seal edge surface 6. It means the range that occupies up to. Therefore, the edge on the seal edge surface 6 side of the alignment portion 10 exists at a position exceeding 1/3 of the separation distance A from the seal edge surface 6 or a position exceeding 5 mm from the seal edge surface 6. Yes. A stud pin 17 is sealed on the inner surface of each side portion 4.
[0034]
FIG. 2 is a perspective view showing an essential part of a glass bulb 20 for a cathode ray tube formed by sealing the panel 1 and the funnel 18 with a frit glass 19 interposed therebetween. As shown in the drawing, between the reference plane 12 and the second region 16 of the alignment portion 10, side wall step portions 21 are formed on both sides in the longitudinal direction (a-a direction) of the seal edge surface 6. At the same time, an end wall step 22 is formed at the end on the seal edge surface 6 side. These step portions 21 and 22 are smoothly connected to the reference plane 12 and the second region 16 via curved surfaces 23 and 24, respectively. The side wall step portion 21 gradually increases from zero as it moves from the break line 8 to the seal edge surface 6 side, and each side wall step portion 21 and the end wall step portion 22 are also curved. It continues smoothly through the surface 25.
[0035]
Note that a funnel alignment portion 27 is also formed on the outer surface of the body portion 26 of the funnel 18 at the same position in the aa direction as the alignment portion 10 of the panel 1. The funnel alignment portion 27 in the illustrated example is formed as a protrusion having a reference plane 29 that is formed in the vicinity of the seal edge surface 28 on the outer surface of the body portion 26 and gradually widens toward the seal edge surface 28 side.
[0036]
According to the panel 1 according to the first embodiment, not only the mold match line 7 but also the break line 8 is away from the seal edge surface 6 as compared with the curved panel, the reference plane of the alignment unit 10. 12 is formed from the break line 8 toward the seal edge surface 6 side, the separation distance between the reference plane 12 and the seal edge surface 6 is set to be a curved panel (the reference plane is from the break line to the mold match line). The positioning jig used when sealing the panel 1 and the funnel 18 can be shared with the curved panel, and the positioning work can be shared. It becomes possible. Further, since the gradient of the reference plane 12 is set on the same plane as the outer surface of the first region 15, a positioning error is unlikely to occur when the positioning jig is brought into contact with the reference plane 12, and the glass tube for the cathode ray tube is used. As a result, the product yield of the cathode ray tube is improved.
[0037]
In addition, since one end of the reference plane 12 of the alignment unit 10 configured as a protrusion is continuous with the outer surface of the first region 15 without a step, for example, the peripheral edge of the reference plane extends over the entire circumference. Compared with the case where the area 1 is raised from the outer surface, the flowability of the molten glass with respect to the periphery of the alignment portion 10 is improved when the panel 1 is press-molded, thereby improving the moldability of the panel 1 and alignment. The probability of occurrence of wrinkles and cracks in the portion 10 and its periphery is reduced.
[0038]
In addition, the abutment point 11 against which the positioning jig is abutted is present in the vicinity of the reference plane 12 of the projection constituting the alignment unit 10, and when projecting with the funnel 18, this projection and the reference plane The presence of 12 can be recognized at a glance. This eliminates the need for an alignment mark for notifying the presence of the alignment portion (abutting point), and makes it possible to form a minute inside the mark due to the formation of an alignment mark formed of a rod-shaped or wedge-shaped convex portion as in the prior art. Problems such as the occurrence of cracks or micro defects and the deterioration of product quality due to this are avoided.
[0039]
Further, since the alignment portion 10 is formed in a region excluding the vicinity of the seal edge surface 6, the panel 1 is placed with the seal edge surface 6 facing downward, for example, when the outer surface of the face portion 2 is polished. When placed on a table or other table or when the placed panel 1 is lifted, the end of the alignment unit 10 on the seal edge surface 6 side may come into contact with the table or the like to cause damage such as chipping or cracking. Can be avoided.
[0040]
Further, the step portions 21 and 22 of the alignment portion 10 are smoothly connected to the reference plane 12 and the second region 16 through the curved surfaces 23 and 24, respectively, and between the step portions 21 and 22 adjacent to each other. Are smoothly connected via the curved surface 25, the flowability of the molten glass with respect to the step portions 21 and 22 of the alignment portion 10 and the periphery thereof is improved during the press molding of the panel 1, and the moldability of the panel 1 is improved. Is improved, and the probability of occurrence of wrinkles and cracks in the step portions 21 and 22 of the alignment portion 10 and the periphery thereof is reduced.
[0041]
FIG. 3 shows a panel 1 ′ (size is 29 inches) according to the second embodiment of the present invention, and the expression form of FIG. 3 is the same as FIG. The panel 1 ′ according to the second embodiment is different from the panel according to the first embodiment described above in that the mold match line 7 ′ is substantially at the same height as the inner surface 30 ′ of the face portion 2 ′. And the break line 8 ′ is located at the approximate center between the mold match line 7 ′ and the seal edge surface 6 ′, and the alignment portion 10 ′ is the break line 8 ′ and the seal edge surface. The point formed within the range of ½ of the separation distance A from 6 ′, and the point 11 ′ is set at a position closer to the seal edge surface 6 ′ than the break line 8 ′. And a pair of alignment marks 13 ′ are formed in parallel at the position on the seal edge surface 6 ′ side of the alignment portion 10 ′ in the second region 16 ′. Other structural requirements are the same as those in the first embodiment. And about the component requirements common to the above-mentioned 1st Embodiment, the same code | symbol is attached | subjected to FIG. 3, and the description is abbreviate | omitted.
[0042]
According to the panel 1 ′ according to the second embodiment, since the alignment mark 13 ′ is formed, the presence of the alignment portion 10 ′ can be recognized more clearly, and a positioning work error due to an oversight of the alignment portion 10 ′ can be avoided. Prevention is ensured. Moreover, the region near the seal edge surface 6 'is a region that is inconspicuous compared to other regions and is a convex portion within a range that does not bulge out from the mold match line 7' that forms the maximum outer diameter portion. Therefore, it is very advantageous to form the alignment mark 13 'without any trouble. Note that the operational effects other than these are the same as those already described for the first embodiment.
[0043]
【The invention's effect】
As described above, according to the cathode ray tube panel according to the present invention, the alignment portion provided on the outer surface of at least two adjacent sides of the so-called flat panel has an outer surface in a region extending from the mold match line to the break line. Since it is composed of protrusions with a reference plane extended to the seal edge surface side, even if the mold match line and break line are far from the seal edge surface compared to the curved panel, Can be made the same as the curved panel. As a result, the positioning jig used for sealing the flat panel and the funnel can be shared with the curved panel, and the positioning operation can be shared, and the gradient of the reference plane extends from the break line to the seal edge surface. Since it is not as large as the outer surface of the region, a positioning error hardly occurs when the positioning jig is brought into contact with the reference plane, and the product yield of the glass bulb and thus the cathode ray tube is improved.
[0044]
In addition, one end of the reference plane of the protrusion that constitutes the alignment portion is continuous with the outer surface of the region from the mold match line to the break line without a step, so that the periphery of the reference plane extends over the entire circumference. Compared with the case where it protrudes from the outer surface of the side part, the flow of molten glass to the periphery of the alignment part is smoothed during press molding of the panel, thereby improving the moldability of the panel and the alignment part and its periphery. The probability of occurrence of wrinkles and cracks in the panel is reduced, and the quality of the panel can be improved.
[0045]
In addition, since the protrusions and the reference plane that make up the alignment part can be recognized at a glance, there is no need for an alignment mark to notify the presence of the alignment part when sealing with the funnel (positioning). As a result, problems such as the occurrence of microcracks or microdefects inside the mark due to the formation of alignment marks made of rod-shaped or wedge-shaped projections as in the prior art, and product quality degradation due to this are caused. Avoided.
[0046]
If the alignment portion is formed in a region excluding the vicinity of the seal edge surface, the panel is placed on a table or a table such as a table with the seal edge surface facing downward, or so. When lifting the panel, it is possible to avoid the possibility of damage such as chipping or cracking caused by contact of the end of the alignment part on the side of the seal edge with the base or plate, etc., and an inconspicuous area compared to other areas In addition, other convex portions (for example, alignment marks) are formed in the vicinity of the seal edge surface, which is a region in which the convex portions can be easily formed within a range that does not bulge from the mold match line that forms the maximum outer diameter portion. It becomes possible to use effectively for formation of.
[0047]
In addition, if the shape of the reference plane of the alignment portion is substantially rectangular, the reference plane can be circular or other square shape when designing or manufacturing a molding surface corresponding to the alignment portion of the panel molding die. Considering that one end of the reference plane is connected to the outer surface of the area from the mold match line to the break line on the same surface without a step, improved moldability around the connected portion This is also advantageous for achieving this.
[0048]
Further, if the stepped portion of the alignment portion is smoothly connected to the reference plane and the outer side surface via curved surfaces, molten glass for the stepped portion of the alignment portion and its surroundings during panel press molding. As a result, the moldability of the panel is improved, and the probability of occurrence of wrinkles and cracks in the stepped portion of the alignment portion and its periphery is reduced, so that the quality of the panel can be improved.
[0049]
Further, if the formation of the alignment mark that informs the existence of the alignment portion is abolished, the occurrence of a micro crack or a micro defect inside the mark due to the formation of the alignment mark formed of a rod-like or wedge-shaped convex portion, and Problems such as product quality degradation due to this are avoided.
[Brief description of the drawings]
FIG. 1 is a view showing a cathode ray tube panel according to a first embodiment of the present invention, and is a front view showing a direction along a major axis, a direction along a minor axis, and a direction along a diagonal axis.
FIG. 2 is a main part enlarged perspective view showing a cathode ray tube glass bulb formed by sealing a cathode ray tube panel and a cathode ray tube funnel according to the first embodiment of the present invention;
FIG. 3 is a diagram showing a cathode ray tube panel according to a second embodiment of the present invention, and is a front view illustrating a direction along a major axis, a direction along a minor axis, and a direction along a diagonal axis.
FIG. 4 is a perspective view showing a conventional cathode ray tube panel (curved surface panel).
FIG. 5 is a view showing a conventional cathode ray tube panel (curved panel), and is a front view showing a direction along a major axis, a direction along a minor axis, and a direction along a diagonal axis, respectively.
FIG. 6 is a view showing a conventional cathode ray tube panel (curved panel), and is a front view showing a direction along a major axis, a direction along a minor axis, and a direction along a diagonal axis.
FIG. 7 is a view for explaining problems of a conventional cathode ray tube panel (flat panel), and is a front view showing a direction along a major axis, a direction along a minor axis, and a direction along a diagonal axis, respectively. It is.
[Explanation of symbols]
1, 1 'panel (panel for cathode ray tube)
2, 2 'face part
4 sides
6, 6 'seal edge surface
7, 7 'Mold match line
8, 8 'breakline
10, 10 'alignment part
12 Reference plane
21, 22 Step part of alignment part
23, 24 Curved surface

Claims (5)

A substantially rectangular face portion that forms an effective screen having an outer surface with a radius of curvature of 10,000 mm or more on the diagonal axis, and each side portion that extends substantially perpendicular to the periphery of the face portion, In the cathode ray tube panel having an outer surface whose gradient increases from the mold match line toward the seal edge surface and having an alignment portion on the outer surface of at least two adjacent sides. ,
The cathode ray tube panel according to claim 1, wherein the alignment portion includes a protrusion having a reference plane extending from the outer surface of the region extending from the mold match line to the break line toward the seal edge surface. 2. The cathode ray tube panel according to claim 1, wherein the alignment portion is formed in a region excluding the vicinity of the seal edge surface. The cathode ray tube panel according to claim 1, wherein a reference plane of the alignment portion has a substantially rectangular shape. 4. The cathode ray tube panel according to claim 1, wherein the step portion of the alignment portion is smoothly connected to the reference plane and the side outer surface via curved surfaces, respectively. 5. The cathode ray tube panel according to claim 1, wherein an alignment mark for indicating the presence of the alignment portion is not formed.

Images