JP2752996B2 - Cathode ray tube envelope and color picture tube - Google Patents

Description

The present invention relates to a cathode ray tube envelope, and more particularly to the structure of a cathode ray tube vacuum envelope having a plurality of necks and to which the structure is applied. The present invention relates to a color picture tube.

(Prior Art) As shown in FIG. 6, for example, a vacuum envelope of a color picture tube having a plurality of necks has a face plate (104) having a screen surface (103) on its inner surface and a substantially rectangular shape. A panel (106) having a skirt (105) extending substantially parallel to the tube axis from the periphery of the face plate (104), and a plurality of necks (107) connected to the skirt (105) and connected via a funnel (107). 108) from the vacuum envelope (1
02) (see JP-A-61-256551). An electron gun (109) is provided inside the plurality of necks (108), and three electron beams (110) emitted from the electron gun (109) (in FIG. 6, three electron beams are grouped together). A predetermined area on the screen surface (103) is deflected and scanned by a plurality of deflection yokes (111) mounted on the outer wall from the neck (108) to the funnel (107).

On the panel (106), a shadow mask (112) having a large number of apertures, and a frame (113) supporting the shadow mask (112) are arranged opposite to the screen surface (103) at a predetermined interval. This shadow mask (11
The color of the three electron beams (110) is selected according to 2), and a predetermined phosphor is caused to emit light by impact. In this manner, the screen surface (103) is divided into a plurality of regions, and the outside of the vacuum of a color picture tube for dividing and displaying an image by electron beams emitted from a plurality of electron guns (109) arranged opposite to the regions. The envelope has an extremely complicated shape as compared with the vacuum envelope of an ordinary color picture tube, and it is very difficult to form glass and is not suitable for mass production.

Further, in order to maintain a sufficient strength against the atmospheric pressure in increasing the size of the vacuum envelope, it is necessary to make the glass thickness of the funnel (107) as thick as the glass thickness of the panel (106).
On the other hand, the glass thickness of the neck (108) is usually very thin, about 1 mm, and the distribution of the heat capacity from the funnel (107) to the neck (108) changes rapidly. The thermal strain in the process increases, and it is apt to break, making it unsuitable for mass production.

(Problem to be Solved by the Invention) When the funnel (107) is made of only glass like a normal cathode ray tube, it is difficult to form the funnel and is not suitable for mass production. Furthermore, as the size of the cathode ray tube increases, the glass thickness of the funnel increases in order to increase the strength against atmospheric pressure, and the distribution of the thickness also changes rapidly, increasing the heat distortion during the manufacturing process and making it unsuitable for mass production. There is a problem.

The present invention has been made in view of the above problems, and provides a structure that facilitates the manufacture of a picture tube having a plurality of necks.

[Configuration of the invention]

(Means for Solving the Problems) The present invention has been made to solve the problems described above, and a part of the vacuum envelope is made of metal. The metal is provided 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. Further, a plurality of reinforcing members can be provided to reinforce the flat metal.

In addition, by using the above vacuum envelope for a cathode ray tube, the weight of the cathode ray tube can be significantly reduced, and a cathode ray tube which is thin and has excellent explosion-proof characteristics can be obtained.

(Operation) By using metal for a part of the funnel, which had a complicated shape in the conventional cathode ray tube envelope, the shape of the funnel can be simplified. Become. In addition, since the heat capacity distribution of the funnel can be made uniform, thermal distortion during the manufacturing process can be reduced.

Further, by using metal, the strength against the atmospheric pressure is greatly improved. Further, by providing a reinforcing material to the metal member, the metal can be made thinner, and the envelope can be reduced in weight.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic perspective view of a cathode ray tube envelope showing one embodiment of the present invention. FIG. 2 shows a cross section taken along the line AA of FIG. 1 and will be described below with reference to FIG.

FIG. 2 is a schematic sectional view of a cathode ray tube envelope of the present invention, and FIG. 3 is a partially enlarged view of FIG.

The cathode ray tube envelope (1) comprises a panel (4) comprising a face plate (2), a skirt (3) extending from a peripheral portion of the face plate (2) substantially in parallel with the tube axis, and the panel (4). A metal connecting member (hereinafter, referred to as a rear plate) (5) connected to and having a main surface substantially parallel to the face plate (2); a plurality of funnels (6) connected to the rear plate (5); A neck (7) extending from the neck (6), a stem (8) connected to a lower portion of the neck (7), and a main surface connected to the rear plate (5) and substantially perpendicular to the main surface of the rear plate (5). And a plurality of reinforcing plates (9) having

The panel (4) has a face plate (2) having a substantially rectangular planar shape similar to that used in a normal cathode ray tube, and has a skirt (3) on the periphery of the face plate (2). The face plate (2) is large enough to form a phosphor screen of 304.8 mm × 406.4 mm on the inner surface, and the height of the skirt (3) is 85 mm.

The outer shape (peripheral shape) of the rear plate (5) is substantially the same as the outer peripheral shape of the skirt (3), and the funnel (6) is formed in the main surface.
And the rear plate (5) has a thickness of 2 mm.

The plurality of glass funnels (6) connected to the rear plate (5) are connected to a neck (7) of a thin glass tube having a funnel shape having an opening size of 30 mm × 25 mm and an outer diameter of 22.5 mm. A stem (8) having outlets for eight electrodes is connected to the end of the neck (7).

A plurality of metal plates (9) bent at right angles are connected to the rear plate (5), and the plate thickness is 2.0 m.
m and height is 20mm.

The rear plate (5) is a sealing alloy containing 50% nickel and has a coefficient of thermal expansion (α) of 99.0 [10 ⁻⁷ / ° C.]. (Α) of panel (4) and funnel (6) is 100.0
[10 ^-7 / ° C].

The rear plate (5), the panel (4) and the plurality of funnels (6) are joined by frit glass (crystalline lead borate glass).

The rear plate (5) is provided with an oxide layer on the metal surface to improve the bonding strength with the frit glass.

A normal mild steel material is used as the reinforcing material (9), and spot resistance welding is used for joining with the rear plate (5).

In the embodiment shown in FIGS. 2 and 3, the rear plate (5) is made thin and a reinforcing plate (9) is connected, and the strength against atmospheric pressure is improved by the reinforcing plate (9), and the weight of the envelope is reduced. This is the case. This reinforcing plate (9) does not need to be provided when the rear plate (5) is sufficiently thick. For example, when the rear plate (5) has a thickness of 5 mm, deformation due to atmospheric pressure is extremely small, and there is no reinforcing material. The envelope can be configured with.

Further, in this embodiment, the reinforcing member (cross section) is bent into an “L” shape and fixed by resistance welding, but in the case of arc welding, plasma welding, or the like, it is not always necessary to bend and fix. It is effective to arrange the necessary number and positions of the reinforcing members (9) in portions where the amount of deformation of the rear plate (5) due to atmospheric pressure is large.

Although the plane shape of the rear plate (5) of this embodiment is a plane perpendicular to the tube axis, the present invention can be applied to, for example, a case having substantially the same shape as the face plate.

Also, as shown in FIG. 4, the present invention is applicable even when the height of the main surface (11) of the rear plate (10) is different from the height of the seal (flat) surface (12) of the panel (4).

Although the rear plate (5) of this embodiment uses a sealing alloy of 50% nickel, the invention is also applicable to a case where a sealing alloy of 52% nickel and 6% chromium is used.

Further, the envelope of this embodiment is a monochrome CRT, a color CRT.
Applies to any case of RT.

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

The color picture tube (201) is formed on the inner surface of a plurality of electron gun units (203) and a face plate (204) housed in an envelope (cathode ray tube envelope) (202) whose inside is evacuated. A metal-backed screen portion (205) having three phosphor stripes R, G, and B as one group and a shadow having a large number of apertures (206) opposed to the screen portion (205) at a predetermined interval. It comprises a mask (206) and a mask section (209) composed of a frame (208) supporting the shadow mask (207).

Each of the electron gun units (203) includes substantially three electron guns, and each generates substantially three electron beams in accordance with a video signal corresponding to each color, and these electron beams are generated by the screen unit (205). Scan a predetermined area.

Each electron beam is shadow mask (207) at a predetermined angle.
To the screen part selected by this (205)
The predetermined phosphor is made to emit light by impact. The screen unit (205) is divided into small areas by a plurality of electron gun units (203), and each is divided and scanned. In the case of this embodiment, the image is divided into three in the vertical direction and four in the horizontal direction, for a total of 12 divisions.

Since such a color picture tube can be regarded as a case where a plurality of small color picture tubes are arranged in parallel, the image quality, that is, the convergence resolution (the spot diameter of the electron beam on the screen) is the same as that of a small color picture tube. It is much better than a conventional color picture tube of the same size.

As in this embodiment, by using metal for a part of the funnel, the structure is simplified as compared with a conventional funnel formed only of glass, and furthermore, it is 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 productivity, and its industrial value is extremely large.

〔The invention's effect〕

As described above, according to the present invention, a part of the cathode ray tube envelope,
In particular, by using metal for a funnel having a complicated shape, the formability of the envelope can be improved and the distribution of the heat capacity of the envelope can be made uniform. A cathode ray tube envelope which can be reduced and is excellent in mass productivity can be realized.

Further, by providing a metal reinforcing plate on the metal portion (rear plate), a cathode ray tube envelope that is lightweight and has sufficient strength against atmospheric pressure can be easily realized.

In addition, by applying the envelope of the present invention to a color picture tube, a light-weight color picture tube having excellent explosion-proof characteristics can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a cathode ray tube envelope showing one embodiment of the present invention, FIG. 2 is a schematic sectional view taken along line AA of FIG. 1, 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 according to 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. It is a schematic sectional drawing of a pipe.

Claims (2)

(57) [Claims] 1. A glass plate comprising a face plate having a substantially rectangular planar shape, a skirt extending from a peripheral portion of the face plate substantially parallel to a tube axis, a plurality of glass necks, and a plurality of glass necks. A cathode-ray tube, comprising: a plurality of funnels extending in a funnel shape; and a metal connecting member interconnecting the panel and the plurality of funnels and having a main surface substantially parallel to the face plate. Enclosure. 2. A glass panel having a substantially rectangular planar shape and having on its inner surface a fluorescent screen which emits light by projecting an electron beam, and a large number of electron beam passage areas disposed in close proximity to the panel. A shadow mask, a plurality of glass necks that house an electron gun that generates the electron beam facing the fluorescent screen, a funnel-shaped funnel 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 and interconnecting the funnels.