JP2008059777A - Glass funnel for cathode-ray tube and cathode-ray tube - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a glass funnel for a cathode-ray tube with moldability sustained and weight reduced than before, and a cathode-ray tube. <P>SOLUTION: The glass funnel for the cathode-ray tube is provided with a pyramid or conical yoke part having an aperture at one end, a body part connecting to the opposite side end from the aperture of the yoke part and with a nearly-rectangular seal edge part formed on an end of the opposite side of the yoke part, and a neck part connecting to the aperture and equipped with a housing space of an electron gun. With the body part cut to cross a tube axis, when a first line of intersection with the cut section and a flat face going through a center position of a long side of a nearly rectangle-shaped seal edge part passing a tube axis is defined as a short axis, a thickness of the body part on the cut section is thicker than that of its periphery on the short axis, and also, the body part in a shape surrounded by the body part on the cut section is convexed onto an inner face side of a part thicker than its periphery on the short axis in a region with a predetermined distance or more from the seal edge part in the tube axis direction. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a glass funnel for a cathode ray tube, which mainly receives television broadcasts and is used for displaying images by television broadcasts, and a cathode ray tube. The present invention relates to a glass funnel for a tube and a cathode ray tube.

  In recent years, lightweight and thin displays such as a liquid crystal display device (LCD) or a plasma display (PDP) have become widespread as video display devices that receive television broadcasts and are used to display images by television broadcasts. With the spread of such lightweight thin displays, cathode ray tubes that have been widely used in the past are also required to be reduced in weight.

The cathode ray tube is composed of a panel portion having a substantially rectangular face portion for displaying an image and a glass funnel for a cathode ray tube (hereinafter referred to as a funnel portion) forming the back portion. The funnel portion has a substantially rectangular seal edge portion, and a panel portion is bonded to the seal edge portion with solder glass or the like.
Conventionally, in order to reduce the weight of the cathode ray tube, the thickness of the long side of the seal edge portion having a particularly large area is reduced in the funnel portion. In addition to this, a technique for reducing the weight of the cathode ray tube has been proposed (see Patent Document 1).

Patent Document 1 discloses a cathode ray tube in which the effective diameter is enlarged while maintaining the glass strength, the weight is reduced, and the cost is reduced.
In Patent Document 1, a wall portion is provided at the peripheral portion of a substantially rectangular face plate, and the wall thickness of the corner of the wall portion is made thinner than the thickness of the central portion of the long side and the short side of the wall portion. A glass panel having a substantially rectangular shape, a glass neck at one end, an opening end surface having a substantially rectangular shape, and a corner wall thickness of the opening end surface being made thinner than the thickness of other portions There is disclosed a cathode ray tube comprising a funnel, in which an opening end face of a glass panel and an opening end face of a glass funnel are joined with a glass adhesive.

JP 7-320661 A

However, when the thickness of the long side of the seal edge portion of the funnel portion is reduced to reduce the weight of the cathode ray tube as in the conventional case, the molten glass is originally good in fluidity at the time of forming the funnel portion. Regardless, the flow of the molten glass on the short side of the seal edge portion is deteriorated. As a result, the moldability of the funnel part is lowered, and there is a problem that wrinkles are generated on the short side of the seal edge part or air is trapped.
In order to suppress the occurrence of these wrinkles or the accumulation of air, it is necessary to improve the flow of the molten glass on the short side of the seal edge portion. In order to improve the flow of the molten glass on the short side, the thickness of the short side of the funnel part may be increased. However, when the thickness of the short side of the funnel portion is increased, the mass of the funnel portion increases, and the original purpose of reducing the weight of the cathode ray tube cannot be achieved.

Furthermore, in the cathode ray tube disclosed in Patent Document 1, the corner thickness of the opening end face is made thinner than the thickness of other portions. In Patent Document 1, although no formability is disclosed, at the time of molding, the corner portion has a long distance for the molten glass to move. For this reason, when the thickness of a corner part is thin, the flow path of a molten glass cannot always be ensured, but favorable moldability is not obtained.
As described above, in the conventional cathode ray tube, it is difficult to reduce the weight while maintaining the moldability.

  An object of the present invention is to solve the above-described problems of the prior art, and to provide a glass funnel for a cathode ray tube and a cathode ray tube that are lighter than conventional ones while maintaining formability.

  In order to achieve the above object, a first aspect of the present invention is to connect a pyramid-shaped or conical yoke part having an opening at one end to an end of the yoke part opposite to the opening, A glass funnel for a cathode ray tube having a body part having a substantially rectangular seal edge part formed at an end opposite to the yoke part, and a neck part connected to the opening part and having a storage space for an electron gun. The body portion is cut so as to be orthogonal to the tube axis passing through the center position of the substantially rectangular shape of the seal edge portion and the center position of the opening, and the cut surface at this time passes through the tube axis. When the first intersecting line intersecting the plane passing through the center position of the long side of the substantially rectangular shape of the seal edge portion is defined as the short axis, the center of the opening portion from the center position of the substantially rectangular shape of the seal edge portion. In the tube axis direction toward the center position The thickness of the body portion on the cut surface in a region separated from the seal edge portion by a predetermined distance or more is such that the thickness on the short axis is thicker than the periphery thereof, and the body portion is And providing a glass funnel for a cathode ray tube, wherein a portion surrounded by the body portion on the cut surface is thicker on the short axis than the periphery thereof, and has a convex shape on the inner surface side. To do.

In the present invention, the distance from the seal edge portion in the tube axis direction is h, and the distance in the tube axis direction from the seal edge portion to the boundary between the body portion and the yoke portion is h _Y. When the distance h satisfies 5 (mm) ≦ h ≦ h _Y , the short axis is L _S , and the short axis L _S , the tube axis, and the seal edge portion are opposed to each other. the angle of the corner with a diagonal axis L _D connecting the set to theta _D, the normal direction at the intersection of the minor axis L angle from _S is theta _{D /} 2 straight line L _a and the body outer surface the thickness of the body portion and T _a of the thickness of the body portion in the normal direction at the point of intersection between the diagonal axis L _D and the body outer surface and T _D, the short axis L _S end when the thickness of the body portion and _{T S,} the body _{section, T S>} T _a, It is preferable that satisfies _T D> _{T A} and.

Further, in the present invention, when the second axis of intersection between the cut surface and the plane passing through the tube axis and passing through the center position of the substantially rectangular short side of the seal edge portion is defined as the major axis , the major axis and L _L, the angle between the diagonal axis and the long axis L _L and theta _D2, angle the linearly L _B is a theta _{D2 / 2} body outer from the long axis L _L When the thickness of the body part in the normal direction at the intersection with the surface is T _B and the thickness of the body part at the end of the long axis L _L is T _L , the body part is expressed as T _L > T _B , And T _D > T _B is preferably satisfied.

Furthermore, in the present invention, it is preferable that the body portion satisfies T _S > 1.1T _A.
Furthermore, in the present invention, it is preferable that the body portion satisfies T _L > 1.1T _B.

Further, in the present invention, the body portion, the distance h of the tube axis from the seal edge portion at the position which is 0.5h _Y, it is preferable to satisfy T S> 1.4T _A.
Furthermore, in the present invention, it is preferable that the body portion satisfies T _L > 1.4T _B at a position where a distance h in the tube axis direction from the seal edge portion is 0.5h _Y.

  The second aspect of the present invention is housed in the glass funnel for a cathode ray tube of the first aspect of the present invention, a glass panel connected to a seal edge portion of the glass funnel for the cathode ray tube, and a neck portion of the glass funnel for the cathode ray tube. And a deflection yoke provided in a yoke portion of the glass funnel for the cathode ray tube.

  According to the glass funnel for a cathode ray tube of the present invention, the body portion in which the substantially rectangular seal edge portion is formed is orthogonal to the tube axis passing through the center position of the substantially rectangular shape of the seal edge portion and the center position of the opening portion. The body portion is cut so that the first intersecting line intersecting the cut surface at this time and a plane passing through the tube axis and passing through the center position of the substantially rectangular long side of the seal edge portion is the short axis. In the tube axis direction from the center position of the substantially rectangular shape of the seal edge portion toward the center position of the opening portion, the thickness of the body portion on the cut surface is increased in a region more than a predetermined distance from the seal edge portion. In the shape in which the thickness on the short axis is thicker than its periphery and the body part is surrounded by the body part on the cut surface, the thicker part on the short axis is thicker than its periphery. Convex to the side Accordingly, while maintaining moldability, it is possible to reduce the weight of than conventional.

  In addition, according to the cathode ray tube of the present invention, the glass funnel for the cathode ray tube of the present invention that is lighter than the conventional one while maintaining the formability is provided. While maintaining, it can be made lighter than before.

Hereinafter, a glass funnel for a cathode ray tube and a cathode ray tube of the present invention will be described in detail based on preferred embodiments shown in the accompanying drawings.
FIG. 1 is a schematic perspective view showing a glass funnel for a cathode ray tube according to an embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of the glass funnel for a cathode ray tube shown in FIG. Incidentally, FIG. 2 is a sectional view taken along a second plane P _s shown in FIG.

As shown in FIG. 1, a cathode ray tube glass funnel (hereinafter, referred to as a funnel portion) 10 includes a yoke portion 12, a body portion 14 integrally formed with the yoke portion 12, and a neck portion 16.
The yoke part 12 is a pyramid-shaped or conical member having an opening 12a at one end, and a deflection yoke (not shown) is provided on the outer peripheral surface thereof.
The body portion 14 is integrally provided on the opposite side of the opening 12 a of the yoke portion 12. The body portion 14 is formed with a substantially rectangular seal edge portion 18 at the end opposite to the yoke portion 12. The body part 14 is sealed with a metal anode button 54.

  The neck portion 16 is connected to the opening portion 12a, has a storage portion 16a (storage space) for the electron gun 56 (see FIG. 5), and has a substantially cylindrical shape.

  Moreover, the seal edge part 18 of the body part 14 is a connection part with the panel part 42 (refer FIG. 5) mentioned later. A panel portion 42 (see FIG. 5) is connected to the seal edge portion 18 using, for example, glass solder. Thereby, it becomes a vacuum envelope which constitutes a part of cathode ray tube 40 (refer to Drawing 5) mentioned below.

Next, the shape of the inner surface 14b of the body part 14 of the funnel part 10 of this embodiment will be described in detail.
FIG. 3 is a schematic diagram showing the contour shape of the cut surface of the glass funnel for a cathode ray tube shown in FIG. 1 along the tube axis direction, and FIG. 4 is a schematic diagram showing the contour shape shown in FIG. 3 along the tube axis direction. It is an enlarged view which expands and shows the area | region of 1/4 of a figure. In FIG. 4, a part of FIG. 3 is omitted and simplified.

  FIG. 3 shows the contour shape of the inner surface 14b of the body portion 14 of the funnel portion 10, and the horizontal contour line indicated by the symbol β is the body portion 14 on the cut surface at a predetermined position in the tube axis direction α. This shows the contour shape of the inner surface 14b. In FIG. 3, the contour shape of the inner surface 14 b of the body portion 14 on the cut surface close to the neck portion 16 in the tube axis direction α is shown as the horizontal contour line β closer to the tube axis A of the body portion 14.

In the funnel portion 10 of the present embodiment, as shown in FIG. 1, so as to be perpendicular to the tube axis A passing through the substantially rectangular center position G ₂ of the center position G ₁ and the opening 12a of the shape of the seal edge portion 18, A surface that cuts the body portion 14 is defined as a cut surface _Pc .
Further, the minor axis and the cut surface P _c, through the tube axis A, a first intersection line g ₁ intersecting with the first plane P _f passing through the center position of the long side of the substantially rectangular shape of the seal edge portion 18 It is defined as L _S.
Further, from the center position G ₁ of substantially rectangular shape and the tube axis direction α towards the center position G ₂ of the opening 12a of the seal edge portion 18.
In the seal edge portion 18 of the body portion 14 of the present embodiment, as shown in FIG. 2, the wall thickness is constant at a distance less than a predetermined distance M in the tube axis direction α from the end surface 18 a of the seal edge portion 18. .

The funnel portion 10 of the present embodiment has a horizontal contour line β shown in FIG. 3 in a region 20 that is at least a predetermined distance M (see FIG. 2) from the end face 18a of the seal edge portion 18 in the tube axis direction α shown in FIG. as shown, the wall thickness of the body portion 14 on the cut surface P _{c (see} FIG. 1) is a wall thickness on the minor axis L _S is thick in comparison with its surroundings. Further, in the body portion 14, a portion surrounded by the body portion 14 on the cut surface P _c (see FIG. 1) is thicker on the short axis L _S than the periphery thereof, and the body portion 14 has a convex shape on the inner surface side. ing.
Furthermore, the funnel portion 10 of the present embodiment, the long side of the body portion 14, the thickness of the short axis L _S is thick, the wall thickness of the corner portion 14c is thick, and a minor axis L _S and the corner portion 14c The wall thickness is thin. In addition, the shape of the outer surface 14a of the body portion 14 is the same as the conventional shape.

In the funnel portion 10 of the present embodiment, the body portion 14, thus increasing the thickness of the short axis L _S is compared to its surroundings, and a convex shape on the inner surface 14b side, on the minor axis L _S When forming the funnel portion 10 from the molten glass gob by increasing the thickness of the corner portion 14c and increasing the thickness of the corner portion 14c, and reducing the thickness between the short axis L _S and the corner portion 14c, the body portion In the entire region of 14, the fluidity of the molten glass is ensured. Thus, after molding, in a region located on the minor axis L _S of the body portion 14 (the seal edge portion 18), wrinkling, and the occurrence of air reservoir is suppressed, the moldability is maintained.
Further, the thickness of the body portion 14 on the cut surface P _c, in particular the long side, since the relative thickness of the short axis L _S, is thinner wall thickness around the body portion 14 About the whole, the part with thin thickness can be increased. Thereby, the funnel part 10 whole can be reduced in weight. Thus, in the funnel part 10 of this embodiment, high moldability can be maintained while reducing the weight as compared with the conventional one.

In the funnel portion 10 of the present embodiment, as shown in FIG. 3, a diagonal axis L _D connecting the short axis L _S , the tube axis A, and the opposite corner (corner) 14 c of the seal edge portion 18. And θ _D is defined as
As shown in FIG. 4, the thickness in the area 22 in the normal direction of the body portion 14 at the intersection _{C S} of the outer surface 14a of the body portion 14 of the short axis _{L S,} i.e., the minor axis _{L S} end body portion 14 _Let TS be the thickness.
Further, the thickness in the region 24 in the normal direction of the body portion 14 at the intersection _{C A} of the outer surface 14a of the straight line _{L A} and the body portion 14 and _{T A} is the angle theta _D / 2 from the short axis _{L S} To do.
Further, the thickness in the region 26 in the normal direction of the body portion 14 at the intersection _{C D} between the outer surface 14a of the diagonal axis _{L D} and the body portion 14 and _{T D.}

In the funnel portion 10 of the present embodiment, as shown in FIG. 2, the distance from the seal edge portion 18 in the tube axis direction α is h, and the body portion 14 and the yoke portion 12 are connected to the seal edge portion 18 from the seal edge portion 18. Let h _Y be the distance in the tube axis direction α to the boundary.
At this time, at a cut surface P _c (see FIG. 1) in a region where the distance h of the body portion 14 satisfies 5 (mm) ≦ h ≦ h _Y , that is, a predetermined distance M from the end surface 18a of the seal edge portion 18. In the region 20 of the body portion 14 separated as described above, the body portion 14 of the funnel portion 10 of the present embodiment satisfies T _S > T _A and T _D > T _A. That is, as shown in FIG. 4, the thickness T _S of the region 22 is thick, the thickness T _A of the region 24 is thin, and the thickness T _D of the region 26 is the thickest.
Thus, the funnel portion 10 of the present embodiment, in the range of the short axis L _S corner 14c, i.e., the length for side, the thickness of the region 24 the thickness T _S of the region 22 of the body portion 14 having a thick structure than T _a.

Further, the body portion 14 of the funnel portion 10 according to the present embodiment is configured such that T _S > 1.1T in a region where the distance h in the tube axis direction α from the seal edge portion 18 satisfies 5 (mm) ≦ h ≦ h _Y. It is preferable to satisfy _A.
Thereby, it is possible to further easily maintain the moldability while reducing the weight of the funnel portion 10 as a whole.

Moreover, the body portion 14 of the funnel portion 10 of the present embodiment, at a position a distance h in the tube axis direction α is 0.5h _Y from the seal edge portion _18, to satisfy the T S> 1.4 T _A Even more preferred.
This makes it easier to maintain the moldability while reducing the weight of the funnel portion 10 as a whole.

Moreover, in the funnel part 10 of this embodiment, as shown in FIG. 1, the second passing through the center position of the short side of the substantially rectangular shape of the seal edge 18 through the cut surface _Pc and the tube axis A. a second intersection line _{g 2} intersecting the plane _{P s} and the long axis _{L L.} Furthermore, as shown in FIG. 3, the angle between the long axis L _L and the diagonal axis L _D is θ _D2 .

Further, as shown in FIG. 4, the major axis _L line _L an angle from a theta _D2 / 2 _{L B} and the region 28 in the normal direction of the body portion 14 at the intersection _{C B} of the outer surface 14a of the body portion 14 the thickness at the _{T B.} The thickness in the region 30 in the normal direction of the body portion 14 at the intersection _{C L} of the outer surface 14a of the body portion 14 of the major axis _{L L,} i.e., the thickness of the body portion 14 of the major axis _{L L} end T _{Let L} be.
In this case, in a region where the distance h satisfies 5 (mm) ≦ h ≦ h _Y , the body portion 14 of the funnel portion 10 according to the present embodiment has a long axis L _L end as shown by a two-dot chain line in FIG. The body portion 14 preferably has a thickness T _L that satisfies T _L > T _B and also satisfies T _D > T _B. That is, as shown in FIG. 4, thick thickness _{T L} of the region 30, is thin _{T B} of the region 28, it is preferable that the thickest thickness _{T D} of the region 26.
Thus, also in the range from the corner portion 14c of the long axis L _L, i.e., even in the short side of the body portion 14, by greater than the thickness T _B of the thickness T _L of the region 30 region 28 In addition, it is easier to maintain the moldability while reducing the weight of the funnel portion 10 as a whole.

Further, it is more preferable that the body portion 14 satisfies T _L > 1.1T _B in a region where the distance h in the tube axis direction α from the seal edge portion 18 satisfies 5 (mm) ≦ h ≦ h _Y. .
This makes it easier to maintain the moldability while reducing the weight of the funnel portion 10 as a whole.
The body portion 14 further preferably satisfies T _L > 1.4T _B at a position where the distance h in the tube axis direction α from the seal edge portion 18 is 0.5h _Y.
Thereby, it is possible to further easily maintain the moldability while reducing the weight of the funnel portion 10 as a whole.

Next, the manufacturing method of the funnel part 10 of this embodiment is demonstrated.
The funnel part 10 of this embodiment can manufacture the funnel part 10 by changing the shape of the plunger which shape | molds the funnel part 10 compared with the conventional manufacturing method.

In the method of manufacturing the funnel portion 10 of the present embodiment, first, a glass gob of about 1000 ° C. is supplied into the lower mold, and the yoke portion 12 and the body are used by using a plunger having a shape capable of obtaining the contour shape shown in FIG. The part 14 is integrally pressed.
Next, the sealing portion of the anode button 54 of the body portion 14 and the periphery thereof are locally reheated to a high temperature equal to or higher than the softening point to perform drilling, and the anode button 54 is fitted into this hole and this portion is formed. Is sealed by heating, and an anode button 54 is provided on the body portion 14.
Next, the yoke part 12 and the body part 14 are reheated to a temperature equal to or higher than the annealing point, and the temperature is maintained at a temperature equal to or higher than the annealing point so as to be uniform.
Next, the yoke part 12 and the body part 14 are cooled to room temperature by air cooling.

  Next, the neck portion 16 is welded to the yoke portion 12. The neck portion 16 may be welded to the yoke portion 12 at any timing as long as the yoke portion 12 and the body portion 14 are press-molded. In this way, the funnel portion 10 can be manufactured.

  As described above, in the method for manufacturing the funnel portion 10 according to the present embodiment, the funnel portion 10 according to the present embodiment can be manufactured only by changing the shape of the plunger as compared with the conventional manufacturing method. For this reason, it is possible to suppress an increase in manufacturing cost, and further, it is not necessary to significantly change the production line, and costs such as capital investment can be suppressed.

  Moreover, the funnel part 10 of this embodiment is used as a component of the cathode ray tube 40 as shown in FIG. The electron gun 56 is accommodated in the accommodating portion 16a of the neck portion 16 of the funnel portion 10, and the panel portion 42 having a substantially rectangular face portion for displaying an image is joined to the seal edge portion 18 via the seal portion 44. A vacuum envelope is configured, and a deflection yoke (not shown) is attached to the yoke portion 12 to configure the cathode ray tube 40.

The panel unit 42 is formed with a fluorescent film 46 that emits fluorescence when irradiated with an electron beam at a portion that serves as a display area of an image. A shadow mask 48 for specifying the position of the phosphor irradiated with the electron beam is provided on the neck portion 16 side of the phosphor film 46.
The shadow mask 48 is fixed to the inner surface 53 of the skirt portion 42 a of the panel portion 42 by the stud pin 50.

Further, as shown in FIG. 5, an inner surface dug 52 is formed on the inner surface 14b of the funnel portion 10 to prevent the shadow mask 48 from being highly charged by the electron beam.
Further, a metal anode button 54 sealed in the body portion 14 is connected to the interior doug 52, whereby the shadow mask 48 is electrically connected to the outside via the anode button 54 and grounded.

  In the cathode ray tube 40 shown in FIG. 5, since the funnel portion 10 is reduced in weight while maintaining moldability, the cathode ray tube 40 is also reduced in weight compared to the conventional one.

  Further, in the funnel portion 10 of the present embodiment, the wall thickness is constant within a predetermined distance in the tube axis direction α from the end surface 18a of the seal edge portion 18. For this reason, in the cathode ray tube 40, it is not necessary to change the shape of the joined portion of the panel portion 42 to be joined. Thereby, it is not necessary to change the shape of the mold used for manufacturing the panel portion 42, and an increase in the manufacturing cost of the cathode ray tube 40 can be suppressed.

  As described above, the glass funnel for a cathode ray tube and the cathode ray tube of the present invention have been described. However, the present invention is not limited to the above-described embodiment, and various improvements or modifications may be made without departing from the gist of the present invention. Of course it is good.

Hereafter, the glass funnel (funnel part) for cathode ray tubes of this invention is demonstrated concretely.
In this embodiment, the funnel part shown in FIGS. 6 and 7 (hereinafter referred to as a type 1 funnel part) and the funnel part 10 shown in FIGS. 1 to 4 (hereinafter referred to as a type 2 funnel part) are used. The type was used.
Each funnel section is used as a cathode ray tube for a 21-inch television, has an image display surface aspect ratio of 4: 3, and a deflection angle of 90 °.

  As shown in FIG. 6, the type 1 funnel unit 100 is different from the type 2 funnel unit 10 (see FIGS. 3 and 4) shown in FIGS. Since the configuration other than the above is the same as that of the funnel portion 10 of type II, detailed description thereof will be omitted.

In the funnel portion 100 of the type 1, different configuration of the inner surface 102b of the body portion 102, as shown in FIG. 7, the thickness Ts of the minor axis _{L S} is, the thickness of the straight line _{L A} is the angle that theta _D / 2 and as thin as compared to the T _a, it is of conventional shape.

In this embodiment, the funnel portion of the type 1, the thickness _{T S} on the minor axis _{L S,} the thickness of the thickness _{T D,} the angle is theta _D / 2 straight line _{L A} of the diagonal axis _{L D} T _a, and the distance h is determined shortcomings incidence for three types with different sizes of _T S / _{T a} at position a 0.5h _Y (Comparative example 1 to Comparative example 3).

As shown in FIG. 7, the comparative example 1 is a conventional product in which the horizontal contour line β of the inner surface 102b of the long-side body portion 102 has a convex shape toward the outer surface 104a.
In Comparative Example 1, the thickness T _A of the straight line L _A having an angle θ _D / 2 is thicker than the thickness T _S on the short axis L _S from the ratio T _S / T _A. That is, the thickness of the body portion 102 monotonously increases from the short axis L _S to the diagonal axis L _D (corner portion 102c).

  In Comparative Example 2, the shape of the inner surface 102b of the body part 102 of Comparative Example 1 is changed to reduce the thickness of the body part 102. Comparative Example 2 has basically the same configuration as Comparative Example 1 shown in FIGS. Also in the comparative example 2, the horizontal contour line on the inner surface of the long side body portion has a convex shape toward the outer surface side.

  Furthermore, the comparative example 3 changes the shape of the inner surface of the body part of the comparative example 2, and thins the body part. Comparative Example 3 is basically the same configuration as Comparative Example 1 shown in FIGS. Also in this comparative example 3, the horizontal outline of the inner surface of the body part on the long side has a convex shape toward the outer surface.

Moreover, about the type 2 funnel part, the fault occurrence rate was calculated | required about 1 type (Example 1).
In Example 1, the shape of the inner surface 102b of the body part 102 of Comparative Example 1 is changed to reduce the thickness of the body part. As shown in FIGS. 3 and 4, in Example 1, the horizontal contour line β of the inner surface 14 b of the body portion 14 is uniformly convex toward the outer surface 14 a as compared with Comparative Example 1. is not.
In Example 1, as shown in FIG. 3 and FIG. 4, from the ratio of T _S / T _A , the straight line L _A having an angle θ _D / 2 than the thickness T _S on the short axis L _S. If the thickness T _a is thin. That is, the thickness of the body part 14 does not change monotonously from the short axis L _S to the diagonal axis L _D (corner part 14c).
The funnel portions of Example 1 and Comparative Examples 1 to 3 all have the same outer surface shape.

In addition, the defect in the “defect occurrence rate” is a defect that occurs due to the flow of the molten glass at the time of manufacturing the funnel part of each Example 1 and Comparative Examples 1 to 3. As this fault, for example, the generation of air pockets, the generation of wrinkles, and the like.
The defect occurrence rate indicates the ratio of occurrence of defects when a predetermined number of funnel portions of each of Example 1 and Comparative Examples 1 to 3 are manufactured. The results are shown in Table 1 below.

  In addition, the funnel portion of Example 1 and Comparative Examples 1 to 3 was manufactured using glass materials for funnels (composition code 0138) manufactured by Asahi Glass Co., Ltd., having annealing points and strain points of 490 ° C. and 449 ° C., respectively. did.

In this example, first, with respect to the funnel portion of Example 1, a glass gob melted in a lower mold was set and press-molded using a plunger having a contour shape shown in FIG. At this time, the presence or absence of defects caused by the flow of molten glass was examined.
Next, a predetermined number of funnel portions of Example 1 were manufactured, and the presence or absence of defects was examined for each to determine the defect occurrence rate.
As for the funnel portions of Comparative Examples 1 to 3, as in the funnel portion of Example 1, a predetermined number of funnel portions were manufactured, and the presence or absence of defects was examined for each to determine the defect occurrence rate.

The “inner surface contour pattern” shown in the following Table 1 indicates the shape of the inner surface of the body portion, and “type 1” shown in the “inner surface contour pattern” column indicates the type 1 funnel portion. “Type 2” is a type 2 funnel.
Furthermore, the “light weight reduction rate” shown in the following Table 1 indicates how much weight is reduced with respect to the comparative example 1 based on the product mass of the comparative example 1.

As shown in Table 1 above, as shown in the funnel part of Comparative Example 2 and Comparative Example 3, as the weight was reduced from Comparative Example 1, the defect occurrence rate was higher than that of Comparative Example 1. That is, many defects occurred as compared with Comparative Example 1.
In Example 1, even when the product mass was the same as that of Comparative Example 3, the defect occurrence rate was 0%, which was similar to Comparative Example 1. Example 1 was able to realize a moldability (productivity) equivalent to that of Comparative Example 1 (conventional product) while realizing a significant weight reduction and almost no defects.

It is a typical perspective view which shows the glass funnel for cathode ray tubes which concerns on embodiment of this invention. It is typical sectional drawing of the glass funnel for cathode ray tubes shown in FIG. 1, and is sectional drawing cut | disconnected by the 2nd plane shown in FIG. It is a schematic diagram which shows the outline shape of the cut surface of the glass funnel for cathode-ray tubes shown in FIG. 1 along a pipe-axis direction. It is an enlarged view which expands and shows the 1/4 area | region of the schematic diagram which shows the outline shape shown in FIG. 3 along a pipe-axis direction. It is a typical fragmentary sectional view showing a cathode ray tube using a glass funnel for cathode ray tubes concerning an embodiment of the present invention. It is a typical perspective view which shows the glass funnel (funnel part) for type 1 cathode ray tubes used for the Example of this invention. It is a schematic diagram which shows the outline shape of the cut surface of the glass funnel (funnel part) for type 1 cathode ray tubes shown in FIG. 6 along a tube-axis direction.

Explanation of symbols

10, 100 Glass funnel for cathode ray tube (funnel part)
DESCRIPTION OF SYMBOLS 12, 102 Yoke part 12a Opening part 14 Body part 14a, 102a Outer surface 14b, 42a, 104b Inner surface 16 Neck part 18 Seal edge part 18a End surface 20, 22, 24, 26, 28, 30 Area 40 Cathode-ray tube 42 Panel part 44 Sealing portion 46 Fluorescent film 48 Shadow mask 50 Stud pin 52 Interior dug 54 Anode button 56 Electron gun A Tube axis L _A , L _B straight line L _D Diagonal axis L _L Long axis L _S Short axis g ₁ First intersecting line g ₂ 2nd intersection line P _c cutting plane P _f first plane P _s second plane α tube axis direction β horizontal contour line

Claims (8)

A pyramid-shaped or conical yoke portion having an opening at one end is connected to the end of the yoke portion on the opposite side to the opening, and a seal edge portion having a substantially rectangular shape on the end opposite to the yoke portion A glass funnel for a cathode ray tube having a body portion formed with a neck portion connected to the opening and having a storage space for an electron gun,
The body portion is cut so as to be orthogonal to the tube axis passing through the center position of the substantially rectangular shape of the seal edge portion and the center position of the opening, and the cut surface at this time passes through the tube axis, When the first intersection line intersecting with the plane passing through the center position of the long side of the substantially rectangular shape of the seal edge portion is defined as the short axis, the center position of the opening portion from the center position of the substantially rectangular shape of the seal edge portion The thickness of the body part on the cut surface is thicker on the short axis than the periphery thereof in a region away from the seal edge part by a predetermined distance or more in the tube axis direction toward And the body part is characterized in that a portion surrounded by the body part on the cut surface is thicker on the short axis than the periphery thereof and has a convex shape on the inner surface side. Glass funnel for cathode ray tube. When the distance from the seal edge portion in the tube axis direction is h, and the distance in the tube axis direction from the seal edge portion to the boundary between the body portion and the yoke portion is h _Y ,
In the cut surface in a region where the distance h satisfies 5 (mm) ≦ h ≦ h _Y , the short axis is L _S , and the short axis L _S , the tube axis, and the angle at which the seal edge part is opposed to each other and angle theta _D and diagonal axis L _D which connects the door, wherein the normal direction at the intersection of the minor axis L is the angle from the _S theta _{D /} 2 a is straight line L _a and the body outer surface the thickness of the body portion and T _a, the thickness of the body portion in the normal direction at the point of intersection between the diagonal axis L _D and the body outer surface and T _D, the body portion of the short axis L _S end when the thickness and _{T S,} the body _{section, T} S> T _a cathode-ray tube glass funnel according to claim 1 and is intended to satisfy _T D> _{T a,.} When the second axis of intersection between the cut surface and the plane passing through the tube axis and passing through the center position of the substantially rectangular short side of the seal edge portion is defined as the long axis, the long axis is defined as L _L The angle between the long axis L _L and the diagonal axis is θ _D2, and the normal line at the intersection of the straight line L _B and the body part outer surface whose angle from the long axis L _L is θ _D2 / 2 When the thickness of the body part in the direction is T _B and the thickness of the body part at the end of the long axis L _L is T _L , the body part satisfies T _L > T _B and T _D > T _B The glass funnel for a cathode ray tube according to claim 2, which is satisfactory. 4. The glass funnel for a cathode ray tube according to claim 2, wherein the body portion satisfies T _S > 1.1T _{A. 5} . The glass funnel for a cathode ray tube according to claim 3 or 4, wherein the body portion satisfies T _L > 1.1T _B. The body portion, at a position a distance h of the tube axis from the seal edge portion is 0.5h _Y, according to any one of claims 2-4 which satisfies T S> 1.4 T _A Glass funnel for cathode ray tube. 6. The body part according to claim 3, wherein the body part satisfies T _L > 1.4T _B at a position where a distance h in the tube axis direction from the seal edge part is 0.5 h _Y. 6. Glass funnel for cathode ray tube.   The glass funnel for a cathode ray tube according to any one of claims 1 to 7, a glass panel connected to a seal edge portion of the glass funnel for the cathode ray tube, and an electron housed in a neck portion of the glass funnel for the cathode ray tube. A cathode ray tube comprising: a gun; and a deflection yoke provided at a yoke portion of the glass funnel for the cathode ray tube.

Images