JPH0265039A - Cathode ray tube envelope and color picture tube - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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 particularly to a structure of a cathode ray tube vacuum envelope having a plurality of necks and to which this structure is applied. This relates to color picture tubes.

(Prior Art) As shown in FIG. 6, for example, a vacuum envelope of a color picture tube having a plurality of necks includes a face plate (104) having a generally rectangular shape and having a screen surface (103) on the inner surface;
A panel (105) having a skirt (105) extending from the periphery of the face plate (104) substantially parallel to the tube axis.
06) and a plurality of necks (108) connected to this skirt (105) and connected via funnels (107).
) constitutes a vacuum envelope (102) (see Japanese Patent Laid-Open No. 61-256551). Multiple necks (10
8) is equipped with an electron gun (109), and three electron beams (110) are emitted from this electron gun (109).
) (three electron beams are shown as one group in FIG. 6) are connected to the screen surface (103) by a plurality of deflection yokes (111) attached to the outer wall of the funnel (107) from the neck (108). ) is deflected and scanned over a predetermined area.

A shadow mask (112) having a large number of openings and a frame (113) supporting this shadow mask (112) are disposed on the panel (106) at a predetermined distance from the screen surface (LO3). Three electron beams (110) are generated by this shadow mask (112).
The color is selected and the predetermined phosphor is bombarded with light. In this way, the screen surface (103) is divided into a plurality of regions, and an image is divided and displayed using electron beams emitted from a plurality of electron guns (109) placed opposite to the regions. The envelope has a much more complicated shape than the vacuum envelope of a normal color picture tube, and it is extremely difficult to mold the glass, making it unsuitable for mass production.

Furthermore, as the vacuum envelope becomes larger, the glass thickness of the funnel (107) must be made as thick as the glass thickness of the panel (106) in order to maintain sufficient strength against atmospheric pressure. On the other hand, the glass thickness of the neck (10111) is usually 1 m.
It is extremely thin, and the thickness from the funnel (107) to the neck (
The distribution of heat capacity over 108) changes rapidly, and thermal distortion increases during the heat process that is passed multiple times during the manufacturing process of color picture tubes, making them more likely to break, making them 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, molding of the funnel will be difficult and it will not be suitable for mass production.6 Furthermore, the size of the cathode ray tube will increase. Along with this, in order to increase the strength against atmospheric pressure, the glass wall thickness of the funnel becomes thicker, and the distribution of the wall thickness changes rapidly, which increases thermal distortion during the manufacturing process, making it unsuitable for mass production.

In view of the above-mentioned problems, the present invention provides a structure that facilitates the manufacture of a picture tube having a plurality of necks.

[Structure of the invention]

(Means for Solving the Problems) The present invention has been made to solve the above-mentioned problems, and a part of the vacuum envelope is made of metal. The metal is disposed at a portion connecting the panel and the funnel on which the deflection yoke is installed, and has a flat plate shape substantially parallel to the face plate.

Furthermore, a complementary water reinforcing member may be provided to reinforce this flat metal.

Further, by using the vacuum envelope described above in a cathode ray tube, the weight of the cathode ray tube can be significantly reduced, and a cathode ray tube that is thinner and has excellent explosion-proof characteristics can be obtained.

(Function) By using metal for part of the funnel, which had a complicated shape in conventional cathode ray tube envelopes, the shape of the funnel can be simplified, greatly improving formability, and creating a structure that is easy to mass produce. Become. Furthermore, since the heat capacity distribution of the funnel can be made uniform, thermal strain during the manufacturing process can be reduced.

Furthermore, by using metal, the strength against atmospheric pressure is also significantly improved. Further, by providing a reinforcing material to this metal member, the metal can be made thinner, and the weight of the envelope can be reduced.

(Example) Embodiments 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 AA in FIG. 1 is shown in FIG. 2, and the following description will be made with reference to FIG. 2.

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 ■ consists of a panel (A) consisting of a face plate ■ and a skirt ■ extending approximately parallel to the tube axis from the periphery of the face plate ■, and a panel (A) that is connected to this panel (A) and extends approximately parallel to the face plate ■. A metal connecting member (hereinafter referred to as rear plate) (c) having a main surface of It is composed of a plurality of reinforcing plates (9) connected to the stem (c) and the rear plate (2) and having a main surface substantially perpendicular to the main surface of the rear plate (2).

The panel (A) is a face plate 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 face plate ■ has a width of 304.8 m on its inner surface.
The size is such that a phosphor screen of m x 406.4 nm can be formed, and the height of the skirt (3) is 85 mm.

The rear plate ■ has a plurality of openings in the main surface with the same shape as the openings of the funnel ■, whose external shape (peripheral shape) is between the outer peripheral shape of the skirt ■ and the path, and the plate thickness of this rear plate ■ is 2ff111.

The multiple glass funnels 0 connected to the rear plate ■ are funnel-shaped with an opening size of 30 gm x 25 mm, and are connected to a thin glass tube neck ■ with an outer diameter of 22.5 mm, and the end of this neck ■ is A stem (■) with eight electrode outlets is connected.

A plurality of strong metal plates (2) bent at right angles are connected to the rear plate (2), and the plate thickness is 2.0 mm and the height is 20 mm.

The rear plate (2) is a sealing alloy containing 50% nickel, and has a coefficient of thermal expansion (α) of 99.0 (10″/”C3).

Also, panel (a) and funnel 0 (α) are too,
.

[10-7/''C).

The rear plate (■), the panel (A), and the plurality of funnels 0 are joined with frit glass (crystalline lead borosate glass).

In addition, the rear plate (■) has an oxide layer on its metal surface to improve the bonding strength with the frit glass.

The reinforcing material (9) is made of ordinary mild steel material, and spot resistance welding is used to join it to the rear plate (2).

In the embodiments shown in Figs. 2 and 3, the rear plate (■) is made of a thin plate and is connected to a reinforcing plate (0) to increase the strength against atmospheric pressure.
This is the case when the weight of the envelope is reduced. This reinforcing plate 0 does not need to be installed when the rear plate ■ is sufficiently thick. For example, when the thickness of the rear plate ■ is 5 m, deformation due to atmospheric pressure is extremely small and the envelope is constructed without a reinforcing material. can.

In addition, in this example, the (cross section) of the reinforcing material is It L 11
Although it is fixed by bending it in the shape of a letter and using resistance welding, it is not necessarily necessary to fix it by bending it in the case of arc welding, plasma welding, etc. Furthermore, it is effective to arrange the necessary number and position of the reinforcing members 0) in areas where the amount of deformation of the rear plate (c) due to atmospheric pressure is large.

Although the planar shape of the rear plate (2) in this embodiment is a plane perpendicular to the tube axis, it is also applicable to the case where the shape is, for example, between the face plate and the path.

In addition, as shown in Fig. 4, the main surface of the rear plate (10) (
11) and the height of the seal (flat) surface (12) of panel (2) are different.

Although the rear plate (3) of this embodiment uses a sealing alloy of 50% nickel, it can also be applied to a case where a sealing alloy of 52% nickel and 6% chromium is used.

Furthermore, the envelope of this embodiment is applicable to both monochrome CRTs and color CRTs.

FIG. 5 shows an embodiment of a color picture tube to which the present invention is applied, and will be described in detail.

A color picture tube (201) is formed on the inner surface of a plurality of electron gun sections (203) and a face plate (204) housed in a vacuum-evacuated envelope (cathode ray tube envelope) (202). Three phosphor stripes R and G.

A metal-backed screen part (205) with B as one group, a shadow mask (206) having a large number of apertures (206), and a shadow mask (206) which is arranged oppositely to the screen part (205) at a predetermined interval;
7) The mask part (
209).

Each of the electron gun sections (203) includes substantially three electron guns, each of which generates substantially three electron beams in response to a video signal corresponding to each color, and these electron beams are applied to the screen section (205). Scan a predetermined area.

Each electron beam has a shadow mask (207) at a predetermined angle.
and is selected by the screen portion (205).
A predetermined phosphor on the top is caused to emit light by impact. Further, the screen section (205) is divided into small areas by a plurality of electron gun sections (203), and each area is divided and scanned. In this embodiment, the needle is divided into three parts in the vertical direction and four parts in the horizontal direction and 12 parts.

This type of color picture tube can be viewed in the same way as multiple small color picture tubes arranged in parallel, so the image quality or convergence resolution (the spot diameter of the electron beam on the screen) is determined by the small color picture tube waves. This is significantly better than a regular color picture tube of the same size.

By using metal for part of the funnel, as in this example, the structure is simpler than the conventional funnel molded only from glass, and it is also extremely resistant to atmospheric pressure and thermal distortion during the manufacturing process. A color picture tube to which this envelope is applied is excellent in mass production, and its industrial value is extremely large.

〔Effect of the invention〕

As described above, according to the present invention, by using metal for a part of the cathode ray tube envelope, especially the complex-shaped funnel, the moldability of the envelope is improved and the distribution of heat capacity of the envelope is improved. Since it can be made uniform, thermal distortion generated in each part of the envelope during the heating process can be reduced, and a cathode ray tube envelope with excellent mass productivity can be realized.

Furthermore, by providing a metal reinforcing plate on the metal part (rear plate), it is possible to easily realize a cathode ray tube envelope that is lightweight and has sufficient strength against atmospheric pressure.

Further, by applying the envelope of the present invention to a color picture tube, it is possible to obtain a color picture tube that is lightweight and has excellent explosion-proof characteristics.

[Brief explanation of the drawing]

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 taken along line AA in FIG. 1, and FIG. 3 is a partially enlarged view of FIG. FIG. 4 is a schematic sectional view of a cathode ray tube envelope showing another embodiment of the present invention, FIG. 5 is a schematic sectional view of a color picture tube showing an embodiment of the present invention, and FIG. 6 is a conventional color picture tube. FIG. 3 is a schematic cross-sectional view of a tube. Diagram

Claims (2)

[Claims] (1) A glass panel consisting of a face plate having a substantially rectangular planar shape, a skirt extending approximately parallel to the tube axis from the peripheral edge of the face plate, a plurality of glass necks, and a skirt extending from the plurality of necks. a plurality of funnel-shaped funnels; and a metal connecting member that interconnects the panel and the plurality of funnels and has a main surface substantially parallel to the face plate. . (2) A glass panel that is approximately rectangular in plan view and has a fluorescent screen on its inner surface that emits light when an electron beam hits it, and a shadow mask that has a large number of electron beam passage areas placed close to and opposite to this 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; the panel and the plurality of funnels; and a metal connecting member having a main surface substantially parallel to the fluorescent screen.