JP3335377B2 - Display tube for light source - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art FIG. 2 is a sectional view of a main part showing a structure of a conventional fluorescent display tube for a light source. In FIG. 1, reference numeral 1 denotes a cylindrical glass bulb, and 2 denotes a windshield sealed at one open end of the glass bulb 1 via a frit glass seal 3. A cylindrical glass bulb structure 4 having one end sealed by a frit glass seal 3 is formed. 5 is a fluorescent screen formed on the back surface of the windshield 2, 6 is an Al metal back film formed on the fluorescent screen 5, 7 is a carbon film formed on the inner wall surface of the glass bulb 1 on the windshield 2 side, 8 is This is a Ba getter film formed between the Al metal back film 6 and the carbon film 7 and electrically connected therebetween.

Further, reference numeral 10 denotes a stem structure sealed at the other open end of the glass bulb structure 4, and 11 denotes a glass bulb 1
Is a stem glass sealed to the other open end of the stem 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 connected to the lead pin 15a on the stem glass 11. 16 is a cathode structure fixedly disposed at the tip of the lead, 17 is a lead pin 1
A cylindrical anode ring 19 is fixedly arranged at the tip of the anode lead 18 connected to the anode lead 5b.
Numeral 0 denotes a valve spacer contact which is attached and fixed to the tip of the anode ring 17 and is electrically connected to the carbon film 7 in contact therewith.

In such a configuration, a high voltage externally supplied to the lead pin 15b is applied to the anode lead 18b.
→ Anode ring 17 → Valve spacer contact 20
→ The carbon film 7 → the Ba getter film 8 are respectively conducted to be applied to the Al metal back film 6 and contribute to the light emission of the phosphor screen 5.

[0005]

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

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to simplify an anode ring and a carbon film constituting an anode electrode structure and impair electrical characteristics. In addition, an object of the present invention is to provide a display tube for a light source in which an anode electrode structure can be manufactured at a low cost and the manufacturing cost can be reduced.

[0007]

SUMMARY OF THE INVENTION The present invention to achieve the above object, the anode electrode structure constituted by a cylindrical body having an elastic force which is formed by rounding a thin metal plate, and meta
This is electrically connected to a Ruback film .

[0008]

Anode structure comprising a cylindrical body of thin metal plate in the DETAILED DESCRIPTION OF THE INVENTION The present invention, the high voltage supplied to the anode lead Ba
It is supplied to the Al metal back film via the getter film.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a sectional view showing a configuration of an embodiment of a display tube for a light source according to the present invention. In the drawing, 9 is an anode electrode arranged in close contact by the elastic force of a self to the inner wall surface of, for example, by rolling a thin plate of a rectangular SUS formed by molding into a cylindrical shape and the glass bulb 1.

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

In such a configuration, the high voltage supplied from the outside to the lead pin 15b is applied to the anode lead 18b.
→ The anode electrode 9 → the 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 such a configuration, the anode electrode structure for supplying a high voltage to contribute Al metal back film 6 to the emission of the phosphor screen 5 is rounded thin plate rectangular SUS and molded into a cylindrical shape forming Since the anode electrode 9 can be configured, the configuration is simplified, and the cost of parts is reduced.
The anode electrode structure can be manufactured at low cost. In addition, since a complicated process such as coating the carbon film 7 in the glass bulb 1 and sealing the anode ring 17 so that the center axis thereof is aligned is not required, the manufacturing process is simplified, and the manufacturing cost is reduced. Become.

According to such a configuration, even if the anode electrode 9 is arranged close to the phosphor screen 5, it does not obstruct the electrons from the cathode structure 14 incident on the phosphor screen 5.

[0014]

As described above, according to the present invention,
By the anodic electrode structure is constituted by a cylindrical body formed by rounding a thin metal plate, such as a conventional anode ring and the carbon film is not required, without impairing the electrical characteristics that the configuration is simplified, the anode An extremely excellent effect is obtained in that the electrode structure can be manufactured at a low cost, the manufacturing cost can be reduced, and a display tube for a light source can be provided at a low cost.

[Brief description of the drawings]

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

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

[Description of Signs] 1 Cylindrical glass bulb 2 Front glass 3 Frit glass seal 4 Glass bulb structure 5 Phosphor screen 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

──────────────────────────────────────────────────続 き Continuing on the front page (72) Koji Seko, Inventor, 700, Wada, Ueno-cho, Ise City, Mie Pref. Inspector, Ise Electronics Industry Co., Ltd. Naohide Murata (56) References JP-A-57-5238 (JP, A (58) Fields surveyed (Int. Cl. ⁷ , DB name) H01J 63/06 H01J 63/02

Claims (1)

(57) [Claims] At least a phosphor screen, a metal back film, and an anode electrode structure are formed on an inner wall surface of a cylindrical glass bulb assembly having one end sealed, and are connected to the anode electrode structure.
Anode lead, cathode lead and the metal bar
Fixed to the tip of the cathode lead so as to face the backing film.
The other end is sealed with a stem structure having a cathode structure
A light source display tube is sealed, the anode electrode structure, characterized in that configured, and the is metal back film electrically joined and by a cylindrical body having an elastic force which is formed by rounding a thin metal plate Light source display tube.