JPH03105831A - Envelope for cathode ray tube and color image receiving tube - Google Patents

Abstract

PURPOSE:To enhance the molding properties and productivity of a envelope by using metals in making a part of the envelope for a cathode ray tube in particular, a part of a funnel complicated in shape. CONSTITUTION:A shell envelope 1 for a cathode ray tube is made up out of a panel 4 composed of a face-plate 2 roughly in a rectangular shape and a skirt 3 which extend in parallel with a tube axis from the peripheral section of the face-plate 2, metallic connecting members (rear plates) 6 which are connected with the aforesaid panel 4 via No.2 intermediate member A5-1 and a reinforcing means 5-2 and have main surfaces roughly parallel to the face-plate 2, a plurality of funnels 8 which is connected with the rear plate 6 via No.1 intermediate members B7, and of the plurality of reinforcing members 11 which is connected with the rear plate 6 and has a main surface roughly normal to the main surface of the rear plate 6. When a part of each funnel 8 is made up from metals as described above, each funnel is simplified in shape, and molding properties and productivity are thereby enhanced.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Field of Application) The present invention relates to a cathode ray tube envelope, and in particular to a structure of a cathode ray tube vacuum envelope having a plurality of necks and to which this structure is applied. It concerns color picture tubes. (Prior Art) A vacuum envelope of a color picture tube having a plurality of necks, for example, as shown in FIG.
A panel (
106) and a plurality of necks (108) connected to this skirt (105) and connected via funnels 007).
) constitutes a vacuum envelope (102) (see Japanese Patent Laid-Open No. 61-256551). Multiple necks (10
g) is equipped with an electron gun (109), and three electron beams (110) are emitted from this electron gun (109).
) (in Fig. 2, three electron beams are shown as one group) extends from the neck (10g) to the funnel (107) and is connected to the screen surface (103) by a plurality of deflection yokes (111) attached to this outer wall. ) is deflected and scanned over a predetermined area. A shadow mask (112) having a large number of openings and a frame (113) supporting the shadow mask (112) are arranged on the panel (106) at a predetermined distance from the screen surface (103). This shadow mask (112) allows three electron beams (IIO
) is selected in color and causes a given phosphor to emit light. In this way, the screen surface (103) is divided into multiple areas,
The vacuum envelope of a color picture tube, which displays an image dividedly using electron beams emitted from a plurality of electron guns (109) arranged opposite to each other, is different from the vacuum envelope of a normal color picture tube. It has an extremely complex shape and is extremely difficult to mold into glass, making it unsuitable for mass production.Furthermore, as the vacuum envelope becomes larger, the funnel (107) has to be made in order to maintain sufficient strength against atmospheric pressure. It is necessary to make the glass wall thickness as thick as the glass wall thickness of the panel (106). On the other hand, the glass wall thickness of the neck (108) is usually extremely thin, about 1 inch, and the thickness of the glass from the funnel (107) to the neck (1
08) The distribution of heat capacity changes rapidly during the manufacturing process of color picture tubes, and thermal distortion increases during the heat process that goes through multiple times during the manufacturing process of color picture tubes, making them more likely to break and becoming unsuitable for mass production. (Problems to be Solved by the Invention) If the funnel (107) is constructed of only glass like a normal cathode ray tube, it will be difficult to process the funnel into a certain shape, making it unsuitable for mass production. Furthermore, as cathode ray tubes become larger, the glass wall thickness of the funnel becomes thicker in order to increase its strength against atmospheric pressure, and the distribution of wall thickness changes rapidly, increasing thermal distortion during the manufacturing process, making it unsuitable for mass production. There is a problem.
In view of the above-mentioned problems, the present invention provides a structure that facilitates the manufacture of a picture tube having multiple necks. [Structure of the Invention] (Means for Solving the Problems) The present invention includes a glass panel comprising a face plate having a substantially rectangular planar shape and a skirt extending from the periphery of the face plate substantially parallel to the tube axis. , a plurality of glass necks, a plurality of funnel-shaped funnels extending from the plurality of glass necks, and a metal that interconnects the glass panel and the plurality of funnels and has a main surface substantially parallel to the face plate. a connecting member, a first intermediate member between the plurality of funnels and the metal connecting member, and a second intermediate member between the glass panel and the metal connecting member, By using a cathode ray tube envelope having reinforcing means in the vicinity of the glass connecting portions of the first and second intermediate members, it is possible to form an envelope with a complicated shape and also realize weight reduction.

Furthermore, a glass panel having a substantially rectangular planar shape and having a fluorescent screen on the inner surface that emits light when an electron beam strikes the glass panel, and a shadow mask having a large number of electron beam passage areas disposed close to and facing the glass panel. a plurality of glass necks facing the fluorescent screen and housing an electron gun that generates the electron beam; a plurality of funnel-shaped funnels extending from the plurality of glass necks; a metal connecting member that interconnects the funnels and has a main surface substantially parallel to the fluorescent screen; a first intermediate member is provided between the plurality of funnels and the metal connecting member; and a first intermediate member is provided between the plurality of funnels and the metal connecting member; A second intermediate member is provided between the metal connecting member and the first intermediate member, and reinforcing means is provided in the vicinity of the glass connecting portion of the first and second intermediate members, thereby providing excellent explosion-proof properties and reducing weight. It is also possible to obtain a color picture tube. (Function) By using the metal of the structure of the present invention for a part of the funnel, which conventionally had a complicated shape in the negative tiiM tube envelope, the shape of the funnel can be simplified and the formability is greatly improved. , the structure is easy to mass produce. In addition, since the first intermediate member is disposed between the metal connecting member and the funnel, and the second intermediate member is disposed between the glass panel and the metal connecting member, an inexpensive and complex-shaped envelope can be obtained. Furthermore, by providing reinforcing means near the connecting portion of the intermediate member to the glass, it is possible to prevent the connecting portion from being destroyed due to thermal deformation of the intermediate member or the like.

By using a sealing alloy for the first and second intermediate members and a mild steel material for the metal connecting member, the envelope can be joined in the order of glass, sealing alloy, mild steel, sealing alloy, and glass,
The use of expensive sealing alloys can be kept to a minimum. Furthermore, according to the present invention, since mild steel can be used for the metal connecting member, formability is further improved. Additionally, since the heat capacity distribution of the funnel can be made uniform, thermal distortion during the manufacturing process can be significantly reduced. (Example) Examples of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic perspective view of a cathode ray tube envelope showing an embodiment of the present invention. A cross section taken along the line A-A in FIG. 1 is shown in FIG. 2, and will be explained below with reference to FIG. FIG. 2 shows a schematic sectional view of the cathode ray tube envelope of the present invention, and FIG. 3 is a partially enlarged view of FIG. 2. The cathode ray tube envelope (1) has a substantially rectangular face plate (2) and a skirt (2) extending from the periphery of the face plate (2) substantially parallel to the tube axis to form a certain panel (2).
This panel ■ is connected via the second intermediate member A (5-1) and the reinforcing means (5-2), and is a metal connecting member (hereinafter referred to as rear plate) having a main surface substantially parallel to the face plate ■. ■ and a plurality of funnels ■ which this rear plate 0 connects to via the first intermediate member B0 and this funnel ■
A neck ■ extending from the neck ■, a stem (10) connected to the lower end of the neck ■, and a plurality of reinforcing plates [l1] connected to the rear plate ■ and having a main surface substantially perpendicular to the main surface of the rear plate ■. Consists of. Panel ■ is a face plate (2) with a roughly rectangular planar shape similar to those used in ordinary cathode ray tubes.
The face plate ■ has a skirt ■ around its periphery, and the inner surface of the face plate is 304.8 m long.
It is large enough to form a fluorescent screen measuring ii x 406.4 mm, and the height of the skirt ■ is 85 mm. The second intermediate member A (5-1) is a ring-shaped thin metal plate whose peripheral edge shape is approximately the same as the outer peripheral shape of the skirt (2) and a width of 20+wn. The reinforcing means (S-Z) is 5++u++ from the inner peripheral shape (dimensions) of the second intermediate member A (5-2).
A large ring-shaped metal plate with a width of 15 mm and a thickness of 0.5 mm.
It is a 50% nickel alloy material of mm. The rear plate 0 has a peripheral edge shaped like a skirt ■ and a second intermediate member A (5-1
), and has a first intermediate member B in its main surface.
(7) It has multiple openings to which it can be attached, and the plate thickness is 2.
■ Mild steel material is used. The opening shape of the rear plate 0, the inner peripheral shape of the first intermediate member Bω, and the inner peripheral shape of the funnel ■ are substantially the same.

The first intermediate member B0 is a ring-shaped thin plate made of a 50% nickel alloy material (sealing alloy) with a thickness of 0.3 mm and a width of 5 mIm. Funnel ■ (wide) has a diagonal length of approximately 40 mm on the opening side
It forms a funnel shape with an outer diameter of 22.5 mm (φ).
It is connected to the neck ① of the holder, and both are made of soft glass material.

Rear plate 0 is connected to a plurality of metal reinforcing plates (11) bent at right angles, made of mild steel with a thickness of 2.0 mm, and has a height of 20 mm. Next, we will explain how to join each member. There are two joining methods used in the present invention: frit seal for glass-to-metal, and seam welding for metal-to-metal. The glass-to-metal bonding involves joining the reinforcing means (5-2) and the second intermediate member A (5-1) on the sealing surface of the skirt (■), and joining the first intermediate member B (5-1) on the sealing surface of the funnel (■). There is a connection with 7). The bonding in this part is by frit glass (12) and is approximately 45mm
Bonding is completed after firing at 0°C for 1 hour. The relationship between the thermal expansion coefficients in this part is that of the second intermediate member A (5-1) and the lth intermediate member B (7) reinforcement! ! (5-2) is 99. O[1
0-'/℃lte, Banel ■, Funnel ■ is 100.0
[10-''/'Cl, and the residual strain after joining is negligible. Also, the reinforcing means (5-2) second intermediate member A (5-1), first intermediate member BC7) An oxide layer is provided in order to improve the bonding strength with the frit glass (l2).

For metal-to-metal joining, the second intermediate member A is attached to the rear plate 0.
(5-1). Reinforcing means (5-2) and first intermediate member B
Perform this when installing ω. Resistance seam welding is used for this joining, and except for the reinforcing means (5-2), welding is performed as far away as possible from the joint with the frit glass (12). The reason why the welding position is separated from the joint area of the frit glass is to prevent the joint surface of the frit glass from peeling off due to thermal deformation that occurs during welding. The reinforcing means (5-2) on the sealing surface of the skirt (5-2) and the second intermediate member (5-1) are welded at multiple locations so that both members are integrated, and the plate thickness as a whole is 0 on the sealing surface.
．． 6mm, and the inside of the sealing surface has a plate thickness of 0.1mm. The second intermediate member (5-1) has a structure in which the entire circumference near the inner periphery thereof is joined by seal welding, and the other parts are freely movable. This freely movable structure allows the difference in thermal expansion or contraction between the panel ■ and the rear plate ■ to be absorbed. Figure 4 shows a reinforcing plate (5-2) attached to the second intermediate member (5-1).
) with and without the second intermediate member (s-
This shows the operation of i). Thin plate materials are used for intermediate members in order to easily absorb differences in thermal expansion, etc. through deformation. This thin plate material (second intermediate member) is the skirt ■
deforms between the inside of the sealing surface and the connecting part with the rear plate 0, and absorbs the difference in thermal expansion, etc. However, if the amount of deformation becomes large, the thin plate material will break away from the frit glass as shown in (a). It peels off from the bonded surface. The present invention was made to prevent this peeling, and the fourth aspect of the present invention is to prevent this peeling.
As shown in Figure (b), the thickness of the second intermediate member (5-1) at the sealing surface of the skirt (■) is substantially thicker than other parts because the reinforcing means (5-2) is connected to it. Because it is thick, all deformation due to differences in thermal expansion, etc. occurs in the thin plate part, and deformation does not extend to the joint surface with the plit glass. Therefore, by providing reinforcing means (S-Z) near the joint surface of the intermediate member with the frit glass, the mechanical and thermal strength of the joint surface can be greatly improved. In this example, resistance seam welding was used to join the rear plate 0, the intermediate members A and B, and the reinforcing means, but welding can also be performed using, for example, plasma welding, laser welding, ultrasonic welding, etc. Alternatively, the intermediate member A and the reinforcing means may be joined using spot resistance welding. Spot resistance welding is used to join the reinforcing plate (work 1) and rear plate ■. In this embodiment, the reinforcing plate (it) (the cross section thereof) is bent into an "LI+" shape and fixedly joined by resistance welding, but in the case of arc welding, plasma welding, etc., it is not necessarily necessary to bend and fix it.

Furthermore, it is effective to arrange the necessary number and position of the reinforcing plates (l1) in areas where the amount of deformation of the rear plate 0 due to atmospheric pressure is large. In the embodiment shown in Fig. 2, the rear plate ■ is made thin and the reinforcing plate (
11) is installed to strengthen the strength against atmospheric pressure.
This is a case where the weight of the envelope is reduced by improving the effect of This reinforcing plate (11) does not need to be provided when the rear plate 0 is sufficiently thick. For example, when the plate thickness is 51, the deformation due to atmospheric pressure is extremely small and the envelope can be constructed without reinforcing material. .

Although the intermediate members A and B and the reinforcing means in this example use a sealing alloy of 50% nickel, they can also be applied when using a sealing alloy of 52% nickel and 6% chromium. Furthermore, the present invention is also applicable to cases where mild steel or the like is used. Although this embodiment has been described for the case where a glass panel having a skirt portion and a substantially flat rear plate are joined, it is also applicable to the case where, for example, a flat panel is joined to a rear plate having a folded peripheral edge. .

5 to 8 show other embodiments of the present invention, and FIG. 5 shows a case where the reinforcing means and the second intermediate member in the embodiment of FIG. 3 are interchanged in position. FIG. 6 shows a case where the rear plate and the second intermediate member are joined at the outer side of the skirt periphery.

7th (!I) is an example in which a protruding portion is provided on a part of the second intermediate member in FIG. 6 to make the thin plate portion easier to deform.

Figure 8 shows a model with multiple protrusions as shown in Figure 7. Although the reinforcing means in this embodiment is used only at the connection part with the skirt, the present invention is also applicable to the case where it is used in the connection part with the funnel. It also applies to vessels. Although the reinforcing means in this example is shown as being welded to the intermediate member, it can also be applied to structures where the reinforcing means is integrated with the intermediate member, and the reinforcing means need not be a flat plate. , for example, it may be a net-like member. Although the reinforcing means in this embodiment is provided around the entire circumference of the sealing surface, it can also be applied to a case where the reinforcing means is provided limitedly at a location where the intermediate member is significantly deformed.

Furthermore, the envelope of the present invention is applicable to both monochrome picture tubes and color picture tubes.

FIG. 9 is an embodiment showing a schematic cross-sectional view of a color picture tube to which the present invention is applied, and will be described in detail. Color picture tube (
201) is a large number of electron gun units (203>) housed in a vacuum-evacuated envelope (cathode ray tube envelope) (202)
and three phosphor stripes R, G. formed on the inner surface of the face plate (204). A metal-backed screen part (205) with B as one group, and a shadow mask (2) having a large number of electron beam passing regions (206) arranged opposite to the screen part (205) at a predetermined interval.
06) and a mask section (209) consisting of a frame (208) that supports the shadow mask (207). Each electron gun section (203) includes substantially three electron guns and generates substantially three electron beams in response to a video signal corresponding to each color, and these electron beams are transmitted to the screen section (205). Scan a predetermined area of . Each electron beam has a shadow mask (207) at a predetermined angle.
and is selected by the screen portion (205).
The specified phosphor above is bombarded with light. Further, the screen section (205) is divided into small areas by a large number of electron gun sections (203), and each area is divided and scanned. In the case of this embodiment, it is divided into 3 parts in the vertical direction and 4 parts in the horizontal direction, and a total of 12 parts. Such a color picture tube can be regarded as the same as multiple small color picture tubes arranged in parallel, so the image quality, that is, the convergence, and the resolution (the spot diameter of the electron beam on the screen) are the same as those of a small color picture tube. This is extremely good compared to a normal color picture tube of the same size. By using metal for part of the funnel as in this example, compared to the conventional funnel formed only from glass,
The structure is simplified, and it is also extremely resistant to atmospheric pressure and thermal distortion during the manufacturing process. Color picture tubes using this envelope are excellent in mass production, and their industrial value is extremely large.

〔Effect of the invention〕

According to the present invention, by using metal for a part of the cathode ray tube envelope, especially the complex-shaped funnel, the shape of the envelope can be improved and the distribution of heat capacity of the envelope can be made uniform. Therefore, the thermal strain generated in each part of the envelope during the thermal process can be reduced, and a cathode ray tube envelope with excellent mass productivity can be obtained. Furthermore, since it is possible to use mild steel for the rear plate, formability is further improved, and at the same time, the joint with the glass is not affected by thermal expansion during thermal processing, improving mechanical and thermal strength. Furthermore, by applying the envelope of the present invention to a color picture tube, a color picture tube that is lightweight and has excellent explosion-proof properties can be obtained.

[Brief explanation of drawings]

Fig. 1 is a schematic perspective view of a cathode ray tube envelope showing an embodiment of the present invention, Fig. 2 is a schematic sectional view of Fig. 1, Fig. 3 is a partially enlarged view of Fig. 2, and Fig. 4 5 to 8 are partial cross-sectional views showing other embodiments of the present invention, and FIG. 9 is a schematic cross-sectional view of a color picture tube showing an embodiment of the present invention. 10 are schematic cross-sectional views of a conventional color picture tube.

Claims (2)

[Claims] (1) An intermediate member that connects a glass panel having a face plate having a substantially rectangular planar shape and a metal member having a main surface substantially parallel to the glass panel, the intermediate member having a reinforcing means. A cathode ray tube envelope characterized by: (2) A glass panel having a substantially rectangular planar shape and having a fluorescent screen on its inner surface that emits light when an electron beam hits it, an electron source that generates an electron beam facing the fluorescent screen, and substantially parallel to the glass panel. 1. A color picture tube comprising: an intermediate member connecting a metal member having a main surface, the intermediate member having reinforcing means.