JPH09288979A - Filament structure for multielectrode electron tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the structure of a supporter, by forming the structure so that all filament wires can be connected to a terminal to be connected to one end of a filament power source, and an electric current, flowed in the filament wires, can be returned through one center lead. SOLUTION: One end of plural filament wires 21, and the other end of these wires 21 are connected to first and second connecting terminals 11 and 12, to supply a filament power source to both connecting terminals 11 and 12. When an electric current is flowed from the connecting terminal 11, the electric current flows, in an arrow Y1 direction in the filament wires 21 via a lead wire 14, into the center lead 15, to flow in an arrow Y2 direction, thereby flowing out from the connecting terminal 12. At that time, the filament wires 21 are heated due to the flow of the electric current, to generate an electron beam. Here, the directions of heating electric currents flowing in the filament wires 21 are equalized, thereby eliminating electric insulation between the filament wires 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filament structure for a multipolar electron tube used for a transmitter tube or the like.

[0002]

2. Description of the Related Art A conventional filament structure for a multipolar electron tube will be described with reference to FIG. 3, taking a multi-strand filament used for a transmission tube as an example.

Reference numeral 31 is a first connection terminal connected to one end of a filament power supply (not shown), and reference numeral 32 is
The second connection terminal is connected to the other end of the filament power supply. A cylindrical ceramic 33 is arranged between the first connection terminal 31 and the first connection terminal 32, electrically insulates the first and second connection terminals 31 and 32, and at the same time holds the inside vacuum. A lead wire 34 is connected to the first connection terminal 31 and the second connection terminal 32. In the figure, four lead wires 34 are connected to each of the first and second connection terminals 31 and 32. The lead wire 34 connected to the first connection terminal 31 extends upward, and the upper ends thereof are housed in separate tubes 35, respectively. In addition, the lead wire 34 connected to the second connection terminal 32
Extend upward through the through holes 36 formed in the first connection terminal 31, and the upper ends are housed in separate tubes 35, respectively. The first connection terminal 31 and the second connection terminal 32
The lead wire 34 connected to is arranged annularly, and therefore the tube 35 is also arranged annularly.

The middle portion of the lead wire 34 is supported and reinforced by a disk-shaped ceramic 37. Two reflectors 38a, 3 are provided between the ceramic 37 and the tube 35.
8b are arranged.

The tube 35 has a filament wire 3
The lower end of 9 is stored one by one, and each tube 35
Inside, one lead wire 34 and one filament wire 39 are welded and electrically connected. The filament wire 39 is provided on the way of the four support members 40a to 40a.
0d, and at its upper end, the first connection terminal 31
The filament wire 39 connected to the second connection terminal 3
Adjacent filament wires 39 connected to No. 2 are connected in pairs.

The structure of the supports 40a-40d for supporting the filament wire 39 will be described with reference to FIG. The supports 40a to 40d electrically insulate adjacent filament wires 39 from each other, and have a structure in which a thin wire 41 of tungsten or the like is processed into a triangular shape as shown in FIG. At this time, the thin wire 41 is wound once at each apex, and a small through hole 42 is formed.

As shown in FIG. 4 (b), a part of the filament wire 43 is provided with a recess, and the recessed part is supported by passing through a through hole 42 formed at the apex of the support. .

In the above structure, for example, when an electric current is input from the first connection terminal (FIG. 3) 31, the electric current flows through the lead wire 34 through the filament wire 39 as shown by an arrow (upward) Y1, and further, The filament wire 39 paired with this flows as shown by an arrow (downward) Y2. Then, it flows out from the second connection terminal 32 via the lead wire 34. The filament wire 39 is heated by such a current flow to generate an electron beam. The heat generated by the filament wire 39 is applied to the reflection plates 38a and 38b.
Is reflected in the direction of the filament wire 39, and the filament wire 39 is effectively heated.

By the way, in the above-mentioned structure, the direction of the heating current is reversed between the adjacent filament wires 39. Therefore, the alternating magnetic field generated by the heating current flowing through the filament wire 39 is not canceled, the electron beam is not modulated, and hum noise is not generated in the output of the transmitter tube.

[0010]

In the above filament structure for a multi-pole electron tube, there is a potential difference between adjacent filament wires. Therefore, when the filament wire is mechanically reinforced with the supports 40a to 40d, it is necessary to electrically insulate the two, and the structure of the supports 40a to 40d becomes complicated. In addition, such supports 40a-40d
Since a plurality of parts are used, parts cost and work time increase.

Further, the filament wire 39 is provided with a recess and is supported by the supports 40a-40d by utilizing the recess. In this case, the position where the recess is provided differs depending on the filament wire 39. Therefore, it is necessary to prepare the filament wire 39 in which the position of the recess is different, and the component cost increases accordingly. Further, the lead wires 34 connecting the filament wire 39 and the connection terminals 31 and 32 also have a potential difference. Therefore, the lead wire 34
Since an insulating material such as ceramic must be used as the reinforcing plate 37 that reinforces, the cost of parts increases. Also,
The first connection terminal 31 also has to have a plurality of through holes through which the lead wires 34 pass, or through holes for fixing the lead wires 34, which complicates the shape and increases the cost of parts.

The present invention solves the above-mentioned drawbacks, and an object of the present invention is to provide a filament structure for a multipolar electron tube with a low component cost.

[0013]

A filament structure for a multipolar electron tube according to the present invention comprises a first connection terminal connected to one end of a filament power supply and a second connection terminal connected to the other end of the filament power supply. It comprises a plurality of filament wires connected to the first connection terminals, and one center lead connected between the plurality of filament wires and the second connection terminals.

Further, a plurality of filament wires are arranged in a ring shape, and a metal plate is arranged inside the plurality of filament wires arranged in a ring shape, and the plurality of filament wires are welded to an outer peripheral portion of the metal plate. Has been done.

According to the above structure, all the filament wires are connected to the first connection terminal connected to one end of the filament power source, and the current flowing through the filament wires returns through one center lead. ing. Therefore, the directions of the heating currents flowing through the filament wires are all the same, and when the filament wires are reinforced with the support, electrical insulation between the filament wires is unnecessary. Therefore, the structure of the support becomes simple.
For example, a disc-shaped metal plate is used as a support, and a filament wire of tungsten or the like is electrically welded to the peripheral portion of the metal plate, whereby a thermally and mechanically strong structure can be realized. In addition, since the structure of the filament wire is entirely straight in its effective portion, it is easy to manufacture and assemble, and mechanization of manufacturing the filament wire is also easy. In addition, it is not necessary to electrically insulate the lead wires connected to the first connection terminals, and a metal material can be used for the support member that supports and reinforces the lead wires. Therefore, the supporting member and the reflecting plate can be made of the same material and have the same structure, and the number of parts can be reduced.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION The embodiments of the present invention will be described with reference to FIG.

Reference numeral 11 is a first connection terminal connected to one end of a filament power supply (not shown), and reference numeral 12 is
The second connection terminal is connected to the other end of the filament power supply. In addition, a cylindrical ceramic 13 is arranged between the first connection terminal 11 and the second connection terminal 12 to electrically insulate the first and second connection terminals 11 and 12, and at the same time, to maintain a vacuum inside. There is. All the lead wires 14 are connected to the first connection terminal 11, and one center lead 15 is connected to the second connection terminal 12. Center lead 15
On the way, the support members 16a, 16b and the reflection plates 17a, 1
7b and through the openings provided in the center of the supports 18a, 18b, respectively, to the upper connection region 19.

Each lead wire 14 extends upward, and the supporting member 1
It extends to the tube 20 via 6a, 16b and the reflection plates 17a, 17b. The lower ends of the filament wires 21 are housed in the tubes 20, and one lead wire 14 and one filament wire 21 are welded inside the tube 20 and electrically connected. The filament wires 21 are arranged inside the filament wires 21 arranged in an annular shape, for example, at two support bodies 18
The outer peripheral portions of a and 18b are welded, and are collectively connected to the center lead 15 in the connection region 19. Also,
Although not shown, around the filament wire 21, various electrodes such as a grid electrode for controlling the electron beam generated by the filament wire 21 and an anode for trapping the electron beam are provided.

In the above structure, for example, when an electric current is input from the first connection terminal 11, the electric current is supplied to the lead wire 14.
And flows through the filament wire 21 as indicated by arrow (upward) Y1. Then, it flows into the center lead 15 and flows in the direction of the arrow (downward) Y2, and the second connection terminal 1
It flows from 2. At this time, the filament wire 21 is heated by the flow of electric current to generate an electron beam. Also,
The heat generated by the filament wire 21 is reflected by the reflection plate 17a,
The heat of the filament wire 21 is effectively used by being reflected in the direction of the filament wire 21 at 17b.

Next, another embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. In FIG. 2, parts corresponding to those in FIG. 1 are designated by the same reference numerals, and overlapping description will be omitted. In the embodiment of FIG. 1, the filament wire 21 and the center lead 15 are connected at the connection region 19 at the upper end. In the embodiment of FIG. 2, a conductive plate 22 is provided on the upper end, the upper end of the filament wire 21 is connected to the conductive plate 22, and the upper end of the center lead 15 is also connected to the conductive plate 22.

According to the above-described embodiment of the present invention, the directions of the heating currents flowing through the filament wires 21 are all the same. Therefore, electrical insulation between the filament wires 21 is not required, and the structure of the supports 18a and 18b can be simplified. For example, the supports 18a, 18b
As a disc-shaped metal plate, a filament wire 21 made of tungsten or the like is electrically welded to the peripheral portion of the metal plate, whereby a thermally and mechanically strong structure can be realized. In addition, since the structure of the filament wire 21 is entirely straight in its effective portion, manufacturing and assembling are easy, and mechanization of manufacturing the filament wire 21 is also easy. Further, it is not necessary to electrically insulate the lead wires 14 connected to the first connection terminals, and a metal material can be used as the support members 16a and 16b that support and reinforce the lead wires 14.
Therefore, the support members 16a and 16b and the reflection plates 17a and 1b
7b can be made of the same material and can have the same structure, and the number of parts can be reduced.

In the above-mentioned embodiment, the example of the transmission tube has been described, but the present invention can be applied not only to the transmission tube but also to other multipole electron tubes. Further, in the case of the present invention, hum noise may occur, but it is not a practical problem in the industrial field.

[0023]

According to the present invention, it is possible to realize a filament structure for a multipolar electron tube having a low component cost.

[Brief description of drawings]

FIG. 1 is a schematic structural diagram showing an embodiment of the present invention.

FIG. 2 is a schematic structural diagram showing another embodiment of the present invention.

FIG. 3 is a schematic structural diagram showing a conventional example.

FIG. 4 is a schematic structural diagram illustrating a conventional example.

[Explanation of symbols]

 11 ... 1st connection terminal 12 ... 1st connection terminal 13 ... Cylindrical ceramic 14 ... Lead wire 15 ... Center lead 16a, 16b ... 17a, 17b ... 18a, 18b ... 19 ... Connection area 20 ... Tube 21 ... Filament wire

Claims (2)

[Claims] 1. A first connection terminal connected to one end of a filament power supply, a second connection terminal connected to the other end of the filament power supply, and a plurality of filament wires connected to the first connection terminal. A filament structure for a multipolar electron tube, comprising the plurality of filament wires and one center lead connected between the second connection terminals. 2. A plurality of filament wires are annularly arranged, and a metal plate is arranged inside the plurality of filament wires arranged annularly, and the plurality of filament wires are welded to an outer peripheral portion of the metal plate. The filament structure for a multipolar electron tube according to claim 1, wherein