JPH0620657A - Display tube for light source - Google Patents

Abstract

PURPOSE:To simplify structure without losing electric characteristic to allow the manufacture of a positive electrode structure at low cost, and realize a display tube at low cost by forming the positive electrode structure from a cylinder formed by rolling a metal thin film. CONSTITUTION:In a display tube for light source, an anode electrode 9 is formed by rolling, for example, a thin film of rectangular SUS into a cylindrical form, closely adhered to the inner surface of a glass bulb 1 by its own elastic force, and arranged thereon. The electrode 9 is fixed to the top end of an anode lead 18 a part of which is supported by a stem glass 11 by spot welding, closely adhered to the inner wall surface by the elastic force in the state inserted into the glass bulb 1, and arranged in a determined position. A high voltage supplied from the outside to a lead pin 15b is applied to an Al metal back film 6 through the anode lead 18 anode electrode 9 a Ba getter film 8 to contribute to the light emission of a phosphor screen 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light source display tube, and more particularly to an anode electrode structure.

[0002]

2. Description of the Related Art FIG. 2 is a cross-sectional view of a main part showing the structure of a conventional fluorescent display tube for a light source. In the figure, 1 is a cylindrical glass bulb, 2 is a windshield sealed to one open end of the glass bulb 1 via a frit glass seal 3, and these glass bulb 1, windshield 2 and A cylindrical glass bulb assembly 4 whose one end is sealed by a frit glass seal 3 is configured. 5 is a phosphor screen formed on the back surface of the windshield 2, 6 is an Al metal back film formed on the phosphor screen 5, 7 is a carbon film formed on the inner wall surface of the glass bulb 1 on the windshield 2 side, and 8 is It is a Ba getter film formed between the Al metal back film 6 and the carbon film 7 and electrically connected to each other.

Further, 10 is a stem structure sealed to the other open end of the glass bulb structure 4, and 11 is the glass bulb 1.
Stem glass sealed at the other open end of the glass via a frit glass seal 12, 13 is an exhaust pipe integrally formed with the stem glass 11, and 14 is a cathode lead which is connected to the lead pin 15a on the stem glass 11. A cathode structure fixedly arranged at the tip of 16 and a lead pin 1
5b is a cylindrical anode ring fixedly arranged at the tip of the anode lead 18, 19 is a Ba getter fixedly attached to the tip of the anode ring 17, 2
Reference numeral 0 is a valve spacer contact that is fixedly attached to the tip of the anode ring 17 and is electrically connected to the carbon film 7 in contact therewith.

In such a structure, the high voltage supplied to the lead pin 15b from the outside is applied to the anode lead 18
→ Anode ring 17 → Valve spacer contact 20
→ Carbon film 7 → Ba getter film 8 are electrically connected to each other and applied to the Al metal back film 6 to contribute to the emission of light from the phosphor screen 5.

[0005]

However, in the conventional display tube for a light source, since the anode ring 17 is formed by the drawing process and the opening process of the metal plate by the press forming method, its manufacturing cost is high. It was Further, since this anode ring 17 is attached and mounted to the tip end portion of the anode lead 18 of the stem structure 10, it is inserted into the cylindrical glass bulb structure 4 and sealed to the stem structure 10 during assembly. However, in this case, it is extremely difficult to seal the central axis of the glass bulb structure 4 with the central axis of the anode ring 17 so that the anode ring 17 is sealed. However, it was difficult to arrange them closely with a certain distance.

Therefore, the present invention has been made to solve the above-mentioned conventional problems, and its purpose is to simplify the anode ring and the carbon film constituting the anode electrode structure and impair the electrical characteristics. In other words, it is an object of the present invention to provide a light source display tube which can be manufactured at a low cost and can be manufactured at a low cost, and at the same time, can be manufactured at low cost.

[0007]

In order to achieve such an object, the present invention comprises an anode electrode structure formed of a cylindrical body formed by rolling a metal thin film.

[0008]

The anode electrode structure comprising the metal thin film cylinder according to the present invention has a high voltage supplied to the anode lead as Ba.
It is supplied to the Al metal back film through the getter film.

[0009]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view showing a configuration of an embodiment of a light source display tube according to the present invention, and the same parts as those in the above-mentioned drawings are designated by the same reference numerals. In the figure, reference numeral 9 denotes an anode electrode which is formed by rolling a rectangular thin film of SUS into a cylindrical shape and which is arranged in close contact with the inner wall surface of the glass bulb 1 by its own elastic force.

The anode electrode 9 has an anode lead 18 whose part is supported by the stem glass 11.
It is fixed to the tip of the glass bulb by, for example, spot welding or the like, and when it is inserted into the glass bulb 1, it is arranged in close contact with a predetermined position on its inner wall surface by its own elastic force. And this anode electrode 9
Is obtained by the Ba getter 19 by the Ba getter film 8.
It is electrically connected to the metal back film 6 and supplies a predetermined high voltage.

In such a structure, the high voltage supplied to the lead pin 15b from the outside is applied to the anode lead 18
→ Anode electrode 9 → Ba getter film 8 is conducted to be applied to the Al metal back film 6 to contribute to the light emission of the phosphor screen 5.

According to this structure, the anode electrode structure for supplying a high voltage to the Al metal back film 6 that contributes to the light emission of the phosphor screen 5 is formed by rolling a rectangular SUS thin film into a cylindrical shape. Since it can be configured by the anode electrode 9 that is,
The anode electrode structure can be manufactured at low cost. Further, since a complicated process such as coating the carbon film 7 in the glass bulb 1 and sealing the anode ring 17 with the central axes thereof aligned is unnecessary, the manufacturing process is simplified and the manufacturing cost is low. Become.

Further, according to this structure, even if the anode electrode 9 is arranged close to the phosphor screen 5, the electrons from the cathode structure 14 incident on the phosphor screen 5 are not blocked.

[0014]

As described above, according to the present invention,
Since the anode electrode structure is composed of a cylindrical body formed by rolling a metal thin film, the conventional anode ring and carbon film are unnecessary, and the structure is simplified without impairing the electrical characteristics. The structure can be manufactured at low cost, the manufacturing cost can be reduced, and the light source display tube can be provided at low cost, which is an extremely excellent effect.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a configuration of an embodiment of a light source display tube according to the present invention.

FIG. 2 is a cross-sectional view showing a configuration of a conventional light source display tube.

[Explanation of symbols]

 1 Cylindrical glass bulb 2 Windshield 3 Frit glass seal 4 Glass bulb structure 5 Fluorescent surface 6 Al metal back film 7 Carbon film 8 Ba getter film 9 Anode electrode 10 Stem structure 11 Stem glass 12 Frit glass seal 13 Exhaust pipe 14 Cathode Structure 15a Lead pin 15b Lead pin 16 Cathode lead 17 Anode ring 18 Anode lead 19 Ba getter 20 Valve spacer contact

 ─────────────────────────────────────────────────── --- Continuation of front page (72) Inventor Tokuhide 700 Wada, Ueno Town, Ise City, Mie Prefecture 700 Ida Denshi Kogyo Co., Ltd. (72) Inventor Koji Seko 700 Wada, Ueno Town, Ise City, Mie Prefecture Ise Electronic Industry Co., Ltd.

Claims (1)

[Claims] 1. A light source display tube in which at least a fluorescent screen, a metal back film, and an anode electrode structure are formed on an inner wall surface of a cylindrical glass bulb structure having one end sealed, wherein the anode electrode structure is formed by rolling a metal thin film. A display tube for a light source, which is composed of a cylindrical body formed as described above and is electrically joined to the metal back film.