JP3121140B2 - Flat cathode ray tube and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat-type cathode ray tube used for a picture tube or an image display device of a video device and a method of manufacturing the same.

[0002]

2. Description of the Related Art The structure of a conventional cathode ray tube of this type is shown in FIG. In FIG. 5, reference numeral 1 denotes a cathode portion serving as an electron beam source, 2 denotes an electron beam extraction means for applying a voltage to the cathode portion 1 to extract an electron beam, and 3 denotes a plurality of electrode plates 3A for controlling the direction of the electron beam. The electron beam control means 4 for controlling is a screen glass on which a phosphor layer 5 which is projected to the electron beam is formed. 6A is a front glass container to which a screen glass is attached, and 6B is a rear glass container. These glass containers 6A and 6B are joined face to face and sealed with a low melting point glass (hereinafter, referred to as frit glass) 8. The storage container 7 as a vacuum container is formed. Further, the electrode plate 3A is supported and fixed by the support 9. Reference numeral 10 denotes a metal wiring terminal for applying a predetermined voltage from an external power supply circuit (not shown) to the electrode plate 3A.
Reference numeral 11 denotes an exhaust pipe for evacuating the inside of the storage container 7 in an exhaust step.

Next, the operation will be described. When a predetermined voltage is applied to the cathode section 1 and a potential is applied to the electron beam extracting means 2, an electron beam is extracted. By sending a control signal to the electron beam controlling means 3, the direction of the extracted electron beam is controlled. Then, the electron beam is accurately projected on the phosphor layer 5 formed on the screen glass 4, whereby the image is reproduced.

[0004]

The conventional flat cathode ray tube has a structure in which the wiring terminals 10 are pulled out one by one from the sealing surface in order to apply a voltage to the electron beam control means 3. For this reason, the overlapping, contact, and narrow pitch of the wiring terminals 10 cannot be avoided at the sealed portion as shown in FIG. 7 after sealing through the softened state from the state before sealing shown in FIG. Overlapping or contact causes an electric short circuit, and at a narrow pitch, the insulating property is reduced, which causes a malfunction of the electron beam control means 3.

In the case where the screen size is increased and the definition is increased to increase the number of wiring terminals 10, the wiring terminals 1
When the front glass container 6A and the rear glass container 6B are sealed with a gap between 0 and 0, the airtightness (10 ⁻⁷⁾ of the storage container 7 due to the difference in linear expansion coefficient between the metal that is the material of the wiring terminal 10 and the frit glass 8 It is difficult to satisfy a higher vacuum than Torr, and the bonding strength of the sealing surface (pressure resistance 3 kg / cm ² ) is satisfied from the ratio of the surface area of the wiring terminal 10 to the area of the frit glass 8 on the sealing surface. It was difficult to do.

The present invention has been made in order to solve these problems, and an object of the present invention is to provide a flat-type cathode ray tube which does not cause overlap, contact, and narrow pitch of the wiring terminals 10, and a method of manufacturing the same. It is another object of the present invention to provide a flat-plate cathode ray tube in which the airtightness of the sealed portion is not reduced and the strength of the sealed portion is large.

[0007]

According to the flat cathode ray tube of the present invention, a plurality of wiring terminals respectively connected to a plurality of electrodes for controlling an electron beam housed in a container are provided around a metal wire. It was arranged at the sealing part of the storage container as a configuration covered with fiber glass.

Further, the flat-type cathode ray tube according to the present invention uses a low melting point glass for sealing a sealing portion of a storage container, and a fibrous glass having a higher softening temperature around the metal wire than the low melting point glass. It is a wiring terminal covered with.

Further, in the method of manufacturing a flat-plate cathode ray tube according to the present invention, a plurality of wiring terminals each having a metal wire covered with a glass fiber are arranged at a predetermined interval in a sealing portion of a storage container and sealed. It is intended to be worn.

[0010]

The flat cathode ray tube according to the present invention uses metal wires covered with fiber-like glass for the wiring terminals, so that the wiring terminals do not overlap or come into contact with each other at the time of sealing, and a narrow pitch does not occur.

In the flat-type cathode ray tube according to the present invention, the fibrous glass and the front and rear glass containers are sealed using frit glass, so that the coefficient of linear expansion does not greatly differ, and the airtightness is improved. Thus, the bonding strength of the sealing portion is increased.

In the method of manufacturing a flat-type cathode ray tube according to the present invention, a plurality of wiring terminals whose metal wires are covered with fiber glass are arranged side by side in a sealing portion and sealed. No contact and no narrow pitch occurs.

[0013]

【Example】

Embodiment 1 FIG. An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a view showing a cross section of a flat cathode ray tube according to the present invention. Reference numeral 12 denotes a wiring terminal, which is formed of a metal wire 13 and a fiber glass 14, and is formed by covering the periphery of the metal wire 13 with the fiber glass 14 as shown in FIG. To cover the metal wire 13 with the fiber glass 14, for example, the fiber glass 14 is wound around the metal wire 13. As a material of the metal wire 13, a 426 alloy (Fe-42Ni-6Cr, linear expansion coefficient α = 91 to 98) generally known as a sealing alloy is used.
× 10 ^-7 / ° C).

Since the metal wire 13 needs to be bonded to the fiber glass 14, an oxide film is formed by wet hydrogen treatment or the like, and then the metal wire 13 is covered with the fiber glass 14. Seal.

FIGS. 3 and 4 illustrate a sealing method using the above-described wiring terminals 12. The required number of wiring terminals 12 are arranged on the sealing surfaces of the front glass container 6A and the rear glass container 6B, and frit glass is used. Seal using 8. Therefore, since the sealing portion is sealed between the glass fiber 14, the frit glass 8, and the glass between the front glass container 6A and the rear glass container 6B, there is almost no movement of the metal wire 13 covered with the glass fiber 14. . In addition, since the difference in the coefficient of linear expansion is reduced, the hermeticity of the sealing portion is good, the bonding strength is increased, and the reliability of the flat cathode ray tube is greatly improved.

The relationship between the diameter φa of the fiber glass 14 and the diameter φb of the metal wire 13 is φa> φb, and the ratio is determined by the number of the wiring terminals 12 arranged on the sealing surface (determined by the screen size and resolution). ).

Embodiment 2 FIG. In the first embodiment, the wiring terminal 1
The glass fiber 13 used in 2 is a glass material having a softening temperature higher than the softening temperature of the frit glass 11 used for the sealing portion. By doing so, the frit glass 8 is first softened and sealed, so that a sealed portion with better airtightness and high adhesive strength can be obtained.

Embodiment 3 FIG. In the above embodiment, the wiring terminal 1
The fiber-like glass 14 used in 2 has a circular cross section as shown in FIGS. 2 and 3, but may be an oval or other shapes instead of a circle. Further, the cross section of the metal wire 13 may be other than circular. Further, although the fiber-shaped glass 14 is wound around the metal wire 13 to form the wiring terminal 12, the fiber-shaped glass 14 may be formed into a tubular shape and the metal wire 13 may be inserted.

[0019]

According to the present invention, since a metal wire is used to surround a metal wire with a fibrous glass as a wiring terminal, it is possible to avoid overlapping, contact, and narrow pitch of the wiring terminals.

In addition, since frit glass is used for the sealing portion and the surroundings of the metal terminals are covered with a fibrous glass having a softening temperature higher than that of the frit glass, a highly airtight and strong sealing is provided. This provides an effect of improving the reliability of the flat cathode ray tube.

[Brief description of the drawings]

FIG. 1 is a sectional view of a flat cathode ray tube according to a first embodiment of the present invention.

FIG. 2 is a perspective view illustrating a structure of a wiring terminal according to the first embodiment of the present invention.

FIG. 3 is a front view showing a sealing method using the wiring terminals according to the first embodiment of the present invention.

FIG. 4 is a cross-sectional view illustrating a sealing method using the wiring terminal according to the first embodiment of the present invention.

FIG. 5 is a cross-sectional view of a conventional flat cathode ray tube.

FIG. 6 is a cross-sectional view showing a state before wiring terminals of a conventional flat-panel cathode ray tube are sealed.

FIG. 7 is a cross-sectional view showing a state after sealing of wiring terminals of a conventional flat-panel cathode ray tube.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cathode part 2 Electron beam extraction means 3 Electron beam control means 4 Screen glass 6A Front glass container 6B Back glass container 7 Storage container 8 Low melting point glass (frit glass) 10 Wiring terminal 12 Wiring terminal 13 Metal wire 14 Fiber glass

Claims (3)

(57) [Claims] 1. A storage container in which a front glass container and a rear glass container are sealed to face each other, a cathode part provided in the storage container as an electron beam source, and an electron beam from the cathode part. An electron beam extraction means for extracting, an electron beam control means for controlling an electron beam composed of a plurality of electrodes, a screen glass on which a phosphor layer which emits light by collision of the electron beam is formed, and A flat cathode ray tube comprising a plurality of wiring terminals which penetrate a sealing portion and are formed by covering the periphery of a metal wire with fiber glass. 2. A storage container having a front glass container and a rear glass container facing each other and sealed with low-melting glass, a cathode portion provided in the storage container as an electron beam source, and An electron beam extraction means for extracting the electron beam, an electron beam control means configured of a plurality of electrodes to control the electron beam, and a screen glass on which a phosphor layer that emits light by the collision of the electron beam is formed, A plurality of wiring terminals configured to penetrate the sealing portion of the storage container and cover the periphery of the metal wire with fibrous glass, wherein the fibrous glass of the wiring terminal has a low melting point for sealing the storage container. A flat cathode ray tube characterized by using a material having a softening temperature higher than that of glass. 3. A cathode unit serving as an electron beam source, an electron beam extracting unit for extracting an electron beam from the cathode unit, and an electron beam control unit for controlling the electron beam, comprising a plurality of electrodes. And, at the time of forming a storage container equipped with a screen glass having a phosphor layer that emits light by the collision of the electron beam, with the front glass container and the rear glass container facing each other,
A method of manufacturing a flat-plate cathode ray tube, wherein a plurality of wiring terminals each having a metal wire covered with a fiber glass are arranged at predetermined intervals at a sealing portion of the storage container and sealed.