阅读说明：本技术 模拟放大用真空管 (Vacuum tube for analog amplification ) 是由 龙田和典 中尾刚启 江崎智隆 于 2019-01-10 设计创作，主要内容包括：本发明的模拟放大用真空管抑制灯丝的振动对放大特性的影响。本发明的模拟放大用真空管具备灯丝、阳极、栅极、防振部。灯丝呈直线状伸展,放出热电子。阳极与灯丝平行地配置。栅极以与阳极相向的方式配置在灯丝与阳极之间。防振部具有能够在真空环境下使用的薄膜,该薄膜与灯丝的一部分接触。(The present invention relates to a bulb for analog amplification which suppresses the influence of the vibration of a filament on the amplification characteristics. The vacuum tube for analog amplification of the present invention includes a filament, an anode, a grid, and a vibration-proof unit. The filament extends linearly and emits thermal electrons. The anode is arranged in parallel with the filament. The grid is disposed between the filament and the anode so as to face the anode. The vibration-proof portion has a thin film that can be used in a vacuum environment, and the thin film is in contact with a part of the filament.)

1. A bulb for analog amplification, comprising:

a filament which emits thermoelectrons and linearly extends;

an anode disposed in parallel with the filament;

a grid arranged between the filament and the anode so as to face the anode; and

a vibration prevention portion having a thin film that can be used in a vacuum environment, the thin film being in contact with a portion of the filament.

2. A vacuum tube for analog amplification as claimed in claim 1,

the filament has: a fixed part having a constant positional relationship with the anode, and a movable part fixed to a member having a constant positional relationship with the anode via an elastic body,

the film of the vibration-proof portion is in contact with the filament at a position closer to the fixing portion than the anode.

3. A vacuum tube for analog amplification, comprising: a filament which emits thermal electrons and extends linearly, and two sets of grids and anodes,

both anodes are formed on the same surface of a planar substrate,

the filament is disposed in parallel with the planar substrate at a position facing both the anodes,

each of the grids is disposed between the anode and the filament so as to face the anode of the same group with a first predetermined distance therebetween and so as to be spaced from the filament with a second predetermined distance therebetween,

the vacuum tube for analog amplification comprises:

a filament intermediate fixing portion that fixes the filament at a position corresponding to an intermediate point between the two sets of anodes; and

two vibration-proof portions having a film that can be used in a vacuum environment,

the film of one of the vibration-proof portions is in contact with the filament between the filament intermediate fixing portion and a portion facing one of the anodes, and the film of the other of the vibration-proof portions is in contact with the filament between the filament intermediate fixing portion and a portion facing the other of the anodes.

4. A vacuum tube for analog amplification according to any one of claims 1 to 3,

the thin film is a thin film of a carbon-based material, aluminum or magnesium.

5. A vacuum tube for analog amplification according to any one of claims 1 to 3,

the film is a film of graphite.

6. A vacuum tube for analog amplification according to any one of claims 1 to 5,

the width of the thin film in contact with the filament is 0.5mm to 2 mm.

Technical Field

The present invention relates to a vacuum tube for analog amplification which operates as an analog amplifier.

Background

Since there is a desire from users who prefer the characteristics of vacuum tubes centered around the music world, there is a need for vacuum tubes that can be used as analog amplifiers. However, there are problems that the production amount is reduced, the price is increased, and the production is difficult. On the other hand, as one of the vacuum tubes, a fluorescent display tube which is inexpensive and has been widely used is difficult to use for analog amplification. The techniques of patent documents 1 and 2 are similar to the configuration of a fluorescent display tube which is inexpensive and easily available, and are known as techniques capable of providing a vacuum tube which can easily operate as an analog amplifier.

Disclosure of Invention

Problems to be solved by the invention

However, the techniques of patent documents 1 and 2 have a problem that the vibration of the filament easily affects the amplification characteristics.

Therefore, an object of the present invention is to suppress the influence of the vibration of the filament on the amplification characteristic.

Means for solving the problems

The vacuum tube for analog amplification of the present invention includes a filament, an anode, a grid, and a vibration-proof unit. The filament extends linearly and emits thermal electrons. The anode is arranged in parallel with the filament. The grid is disposed between the filament and the anode so as to face the anode. The vibration-proof section has a thin film that can be used in a vacuum environment, and the thin film is in contact with a part of the filament.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the characteristics of the bulb for analog amplification of the present invention, the attenuation rate of the vibration of the filament can be increased, and therefore, the influence of the vibration of the filament on the amplification characteristics can be suppressed.

Drawings

Fig. 1 is a plan view of a vacuum tube for analog amplification in example 1.

Fig. 2 is a front view of a vacuum tube for analog amplification of example 1.

Fig. 3 is a side view of a vacuum tube for analog amplification of example 1.

Fig. 4 is a sectional view taken along line a-a of fig. 1.

Fig. 5 is a diagram showing a case where an anode and an insulating layer are formed on a glass substrate.

Fig. 6 is a diagram showing a case where an anode is formed on a glass substrate.

Fig. 7 is a diagram showing the shape of the insulating layer.

Fig. 8 is a three-dimensional view (top view, front view, side view) of the anchor.

Fig. 9 is a diagram showing an example of the shape of the gate electrode.

Fig. 10 is a view showing a getter.

Fig. 11 is a diagram showing an example of an amplifier circuit using a bulb for analog amplification.

Fig. 12A is a diagram showing changes in the influence of the filament vibration on the output of the amplifier circuit, and is a diagram showing the influence in the case where the vibration isolation unit is not provided.

Fig. 12B is a diagram showing changes in the influence of the filament vibration on the output of the amplifier circuit, and is a diagram showing the influence in the case where the vibration isolation unit is provided.

Fig. 13 is a diagram showing the results of changing the material of the film and examining the magnitude of initial noise caused by vibration and the amount of attenuation per second.

Fig. 14 is a plan view of a modified example of the bulb for analog enlargement.

Fig. 15 is a sectional view taken along line B-B of fig. 14.

Detailed Description

Hereinafter, embodiments of the present invention will be described in detail. The same reference numerals are given to the components having the same functions, and redundant description is omitted.