JP2001006580A - Cathode ray tube and method of manufacturing the same - Google Patents

Abstract

(57) [Problem] To provide a cathode ray tube which does not cause neck crack or implosion by eliminating abrasion caused by a valve spacer when sealing an electron gun. SOLUTION: An electron gun 8 is placed inside a neck 6 of a glass envelope.
Is sealed, and this electron gun is a valve spacer made of an elastic body that is in pressure contact with the inner surface of the funnel with the electrode G4 located on the panel side among the plurality of electrodes G1 to G4 arranged in the panel direction from the end side of the neck. In the cathode ray tube to which 13 was attached, an oxide film was formed on at least the surface of the bulb spacer which was in contact with the inner surface of the funnel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cathode ray tube having an improved bulb spacer attached to an electron gun and pressed against the inner surface of a funnel-shaped funnel, and a method of manufacturing the same.

[0002]

2. Description of the Related Art Generally, a cathode ray tube has a glass envelope composed of a panel and a funnel, and emits an electron beam emitted from an electron gun sealed in a cylindrical neck of the funnel outside the funnel. The image is displayed by horizontal and vertical scanning of the phosphor screen provided on the inner surface of the panel by being deflected by the magnetic field generated by the mounted deflection yoke.

The above-mentioned electron gun has a cathode, a heater for heating the cathode, and a plurality of electrodes arranged in the direction from the cathode to the phosphor screen. At the electrode located, the phosphor screen side of the electron gun is supported coaxially with the neck by pressing against the inner surface of the funnel, and the anode supplied to the anode terminal provided on the funnel on the phosphor screen side electrode. A valve spacer for conducting high voltage is installed. This valve spacer is usually formed of an elastic material such as stainless steel.

In general, such an electron gun is sealed by inserting an electron gun with the above-mentioned valve spacer attached into the neck from the neck end side of an envelope provided with various tube members such as a phosphor screen. This is performed by heating and welding a glass stem attached to the cathode side of the electron gun and a neck portion where the stem is located.

[0005]

As described above, in the electron gun of the cathode ray tube, a bulb spacer made of an elastic material is attached to the inside of the neck from the neck end side of the envelope in which various tube members are arranged. An electron gun is inserted, and a glass stem attached to the cathode side of the electron gun and a neck portion where the stem is located are heated and welded to be sealed.

In this case, the valve spacer is bent and inserted into the inner surface of the neck while being strongly frictionally pressed. Therefore, abrasion may occur on the inner surface of the neck made of glass, and from this scratch, neck cracking may occur during or after heating during welding of the stem and the neck or during or after exhausting. It may also explode during or after exhaust.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a cathode ray tube which does not cause neck cracks or implosion by eliminating abrasion caused by a bulb spacer when sealing an electron gun. Aim.

[0008]

An electron gun is sealed in the neck of a glass envelope made up of a panel and a funnel-shaped funnel, and the electron gun is arranged in a panel direction from the end of the neck toward the panel. In a cathode ray tube in which a valve spacer made of an elastic material that presses against an inner surface of a funnel is attached to an electrode located on the panel side among these electrodes, at least a surface of a contact portion of the valve spacer with the inner surface of the funnel. An oxide film was formed.

Further, the oxide film is formed to a thickness of 0.5 to 3 μm.

[0010] Further, a valve spacer made of an elastic material which has a plurality of electrodes in the neck of a glass envelope formed of a panel and a funnel-shaped funnel, and which is in contact with an electrode on the panel side of the electrodes on the inner surface of the funnel. A method for manufacturing a cathode ray tube for sealing an electron gun in a neck by heating and welding a glass stem and a neck attached to the neck end side of the electron gun by inserting the electron gun with the electron gun attached thereto In the above, before attaching the valve spacer to the electrode, heating was performed at 280 to 320 ° C. for 30 minutes to form an oxide film on at least the surface of the contact portion pressed against the inner surface of the funnel.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a color cathode ray tube which is one embodiment of the present invention. This color cathode ray tube has a glass envelope comprising a panel 1 and a funnel-shaped funnel 2, and a phosphor screen 3 comprising a three-color phosphor layer which emits blue, green and red light on the inner surface of the panel 1. Is provided. Opposite to the phosphor screen 3, a shadow mask 4 having a large number of electron beam passage holes formed therein is disposed. On the other hand, in the cylindrical neck 6 of the funnel 2, three electron beams 7B, 7G, 7R arranged in a line passing on the same plane.
Is sealed off. Then, the three electron beams 7B, 7G, 7R emitted from the electron gun 8 are deflected by a deflection yoke 10 mounted outside the funnel 2, and the phosphor screen 3 is passed through a shadow mask 4.
Are horizontally and vertically scanned to display a color image.

As shown in FIG. 2, the electron gun 8 has three cathodes KB, KG, KR (only KR is shown) arranged in a horizontal direction (a direction perpendicular to the paper surface), and these cathodes K
Three heaters H for heating B, KG and KR, a plurality of electrodes arranged in the direction of the phosphor screen from the cathodes KB, KG and KR, and in the illustrated example, first to fourth electrodes G1
~ G4, and these cathodes KB
, KG, KR, heater H, and a plurality of electrodes G1.
G4 is supported by a pair of glass insulating support bars 12. A shield cup C is mounted on the phosphor screen side of the fourth electrode G4, and a plurality of valve spacers 13 made of an elastic material such as stainless steel are mounted via the shield cup C. The valve spacer 13 is attached to a side wall of the shield cup C.

As shown in FIG. 3, the valve spacer 13 has a mounting portion 16 welded to a shield cup at one end of a strip-shaped elastically deforming portion 15 and a spherically shaped contact at the other end pressed against the inner surface of the funnel. The portion 17 is formed in a bent shape.

As shown in FIG. 2, the electron gun 8 has the cathode KB, KG and KR sides supported by a stem 19 welded to the neck 6, the phosphor screen side is provided with a shield cup C, and the funnel 2 is provided. Is supported by a plurality of valve spacers 13 pressed against the inner surface of the funnel 2 via a conductive film 20 formed on the inner surface of the funnel 2, and is coaxially sealed in the neck 6 by the support of the stem 19 and the valve spacer 13. I have.

The bulb spacer 13 not only supports the phosphor screen side of the electron gun 8 coaxially with the neck 6, but also has an anode terminal 21 provided on the funnel 2.
(See FIG. 1.) It has a function of guiding the high anode voltage supplied to the fourth electrode G4 through the conductive film 20.

Particularly, in this embodiment, an oxide film is formed on the surface of the valve spacer 13 with a thickness of 0.5 to 3 μm.

This oxide film can be formed by forming the valve spacer 13 into the shape shown in FIG. 3 and then heating at 280 to 320 ° C. for about 30 minutes.

If the treatment is carried out at a higher temperature or longer time, the oxide film becomes too thick, and the weldability with the shield cup deteriorates. On the other hand, if the temperature is low or the processing time is short, an oxide film having a sufficient thickness cannot be obtained, and the scratch prevention effect described later cannot be obtained.

In this color cathode ray tube, a panel having a phosphor screen formed on its inner surface and a shadow mask is attached to a funnel having an inner surface coated with a conductive film, as shown in FIG. The electron gun 8 is inserted into the neck 6 of the envelope composed of the panel and the funnel by bending the valve spacer 13 from the end 23 of the neck 6 and the stem 19 attached to the electron gun 8 and the stem 19 The neck portion where 19 is located is sealed by heat welding.
Thereafter, the sealed envelope of the electron gun 8 is evacuated.
After that, it is manufactured by performing getter flash, aging for activating the cathode, and high voltage treatment for increasing the withstand voltage.

When an oxide film having a thickness of 0.5 to 3 μm is formed on the surface of the bulb spacer 13 attached to the electrode on the phosphor screen side of the electron gun 8 as described above, the neck 6
When the electron gun 8 is inserted into the
Although the contact portion 17 is bent and presses against the inner surface of the neck 6, the oxide film acts as a lubricant and can be inserted into the neck 6 without causing abrasion. Therefore,
With the above configuration, abrasion occurs conventionally, and when the stem and neck caused by the abrasion are heated and welded, cracks are generated during or after exhaust, and implosion during or after exhaust is performed. Can be eliminated.

In the above embodiment, the oxide film is formed on the entire surface of the valve spacer. However, this oxide film may be formed only on the contact portion that comes into contact with the inner surface of the neck.

In the above embodiment, the color cathode ray tube has been described, but the present invention can be applied to a cathode ray tube other than the color cathode ray tube.

[0024]

As described above, when an oxide film is formed on the surface of the valve spacer attached to the electrode on the phosphor screen side of the electron gun, when the valve spacer is bent to insert the electron gun into the neck, abrasion is caused. And cracks and implosion that have conventionally occurred due to abrasion can be eliminated.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a color cathode ray tube according to an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of an electron gun of the color cathode ray tube.

FIG. 3 is a view showing a configuration of a valve spacer attached to an electrode of the electron gun.

FIG. 4 is a view for explaining a method of sealing the electron gun.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Panel 2 ... Funnel 6 ... Neck 8 ... Electron gun 13 ... Valve spacer 17 ... Contact part C ... Shield cup G1 ... 1st electrode G2 ... 2nd electrode G3 ... 3rd electrode G4 ... 4th electrode

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Shoichi Yokoyama 1-9-1-2 Hara-cho, Fukaya-shi, Saitama F-term in the Toshiba Fukaya plant (reference) 5C041 AA03 AB15 5C042 AA07 KK02 KK03

Claims (3)

[Claims] 1. An electron gun is sealed in a neck of a glass envelope made up of a panel and a funnel-shaped funnel, and the electron gun is provided with a plurality of electrodes arranged in the panel direction from an end of the neck. A cathode ray tube in which a valve spacer made of an elastic material that is pressed against the inner surface of the funnel is attached to the electrode located on the panel side among these electrodes, wherein at least a contact portion of the valve spacer with the inner surface of the funnel is provided. A cathode ray tube having an oxide film formed on a surface. 2. The cathode ray tube according to claim 1, wherein the oxide film is formed to a thickness of 0.5 to 3 μm. 3. A glass envelope comprising a panel and a funnel-shaped funnel, wherein a plurality of electrodes are provided in the neck of the glass envelope, and an electrode is formed of an elastic material which is in pressure contact with an inner electrode of the funnel. An electron gun to which a valve spacer is attached is inserted, and the glass stem attached to the neck end of the electron gun and the neck are heated and welded to seal the electron gun in the neck. In the method for manufacturing a cathode ray tube, before attaching the bulb spacer to the electrode,
A method for manufacturing a cathode ray tube, wherein an oxide film is formed on at least a surface of a contact portion which is pressed against an inner surface of the funnel by heating at a temperature of about 320 ° C. for 30 minutes.