JPS62276749A - Luminous radiation electron tube - Google Patents

Abstract

PURPOSE:To improve the luminous efficiency, by furnishing a magnet to generate the lines of magnetic force along the peripheral form in the tube body, and forming a cathode and an anode to make the line combining the both electrodes cross rectangular to the lines of magnetic force. CONSTITUTION:In a ring-form tube body 1 with the light permeability, a luminous radiation gas such as mercury, cesium, or sodium is sealed at a low pressure, and in a central permeable hole 7, a magnet 6 consisting of a permanent magnet is arranged to make the generating lines of magnetic force follow along the peripheral form of the tube body 1. While a thermion radiation type cathode 2 is furnished at the inside of the tube body 1, an anode 3 is arranged to make the distance from the cathode 2 equal to or less than the mean free path of electrons to get a positive property discharge, and to make the line combining the cathode 3 and the anode 2 cross rectangular to the lines of magnetic force the magnet 6 generates. Therefore, the electron energy in the luminous space is lower than the potential given to to the anode 3, suitable to excite the ultraviolet rays, for example, and the luminous efficiency is increased.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Technical Field 1 The present invention relates to a light-emitting electron tube that excites a light-emitting gas sealed inside a tube by collision of electrons and emits light to the outside of the tube. It is.

[Background technology 1 Prior art, for example, Japanese Patent Application Laid-Open No. 57-130364
There is a lamp as disclosed in the publication.

As shown in FIG. 5, such a lamp does not create a complete vacuum in the tube body 1 (for example, it creates a low vacuum in which mercury vapor exists at a depth of several mToor), and the electrons emitted from the thermionic-emitting cathode 2 are By accelerating the electrons by the field and making the anode 3 pass through the electrons, most of the electrons collide with mercury vapor, which is an ultraviolet emitting gas, at 4° in the back space, exciting the mercury and emitting ultraviolet radiation. The ultraviolet rays are applied to a phosphor (Ga-era type) applied to the inner surface of the tube body 1, and the desired visible light conversion is carried out.The reference numeral 5 in the figure is a DC power source.

By the way, in such a conventional example, in order to allow electrons to enter the back space 4', it was necessary to remove the influence of the space charge inside the tube body 19. Therefore, a potential higher than the ionization voltage of the enclosed substance was applied to the anode. The inside of the tube 1 must be brought into a plasma state, and as a result, the electron energy in the back space 4 is quite high as shown by the mouth line in Fig. 6, and is at an optimal value for excitation and emission (the image in Fig. pIS6). There was a large deviation from song #i), and there was a problem in that the luminous efficiency was extremely low.

[Object of the Invention] The present invention has been made in view of the above-mentioned drawbacks, and its purpose is to reduce the energy of electrons within the tube and provide a light-emitting electron tube with higher luminous efficiency. be.

[Disclosure of the Invention 1] The present invention comprises an annular tube in which a low-pressure light emitting gas is sealed, transparent to the light emission, and communicating at both ends, and a thermionic tube disposed inside the tube. In an emitting cathode and a light-emitting electron tube arranged inside a tube whose phase separation from the cathode is less than the mean free path of electrons, magnetic lines of force are formed along the circumferential shape of the tube. The present invention is characterized in that a magnet is disposed so as to generate a magnetic force, and a seven-meter and a cathode are disposed so that a line connecting the a/- and the cathode is orthogonal to the line of magnetic force.

The present invention will be explained below with reference to Examples.

Figures 1(a) and 1(b) schematically show the Nt composition of the embodiment, in which a light emitting gas such as mercury, cesium, sodium, etc. is inside the annular tube body 1 having translucent properties. It is sealed at low pressure, and lines of magnetic force that generate a magnet 6 made of a permanent magnet are arranged in the center through hole 7 so as to follow the shape of the tube body 1 in the circumferential direction. A thermionic emission type cathode 2 is provided inside the tube 1, and the distance between the cathode 2 is equal to or less than the mean free path of electrons, and the cathode 2 is connected to the cathode 2 so that a positive characteristic discharge can be obtained. , 77-domain 3 is arranged so that its lines are perpendicular to the lines of magnetic force generated by magnet 6.

Next, the operation of the light emitting electron tube of the present invention will be explained based on the principle diagram shown in FIG.

First, when a DC taS voltage is applied between the cathode 2 and the seventh node 3, the electrons ejected from the cathode 2 enter the light emitting space 4 while being wrapped around the magnetic field lines of the magnet 6 (indicated by broken lines in the FFI2 figure), where they are enclosed. A light emitting gas, which is
For example, it collides with an Hg atom and changes its orbit. In other words, it moves to other lines of magnetic force. The electrons are then accelerated by the electric field and collide with the Hg atoms again. By repeating this movement many times, the light emitting space 4 emits light uniformly over the entire surface. Let us now explain the energy of electrons when they collide with Hg atoms.

First, FIG. 3 shows the potential distribution between the anode 3 and cathode 2. From this figure, the energy obtained by the electrons ejected from the cathode 2 until they collide for the first time is expressed as tE, J9.

Here, electrons are transferred to the cathode 2→0.1→ as shown in Figure 3.
Assuming that the path is Q, 2 → Q--(1, + → anode 3), the energy obtained in this process is So, E da, +fa, E da +ra E
do, 10 fa, E da, = eVa.

From this, the energy obtained before the electrons collide becomes much lower than the potential given to the 7)-domain 3. In addition, Va is the node potential, and E is the strength of the electric field.9 In other words, the energy of electrons in the space where light should be emitted is much lower than the potential given to the anode 3, making it suitable for excitation of ultraviolet light, for example, and emitting more light. Efficiency increases.

and Genmoto Example (1±) −: f', ′=F η1] 1 is 6
Ik granite was used for the magnets 6 and L, but as shown in FIG. 5, in this embodiment, an electromagnet was used as the magnet 6.

In each of the embodiments, an annular tube with a short axial length is used as the tube 1, but it is of course possible to use an annular or cylindrical tube with a relatively short axial length. .

[Effects of the Invention] The present invention provides a light-emitting electron tube that has undergone MIJ as described above, and connects a magnet disposed so as to generate lines of magnetic force along the circumferential shape of the tube, and the anode and cathode. Since the anode and cathode are arranged so that the lines are perpendicular to the magnetic field lines, the energy of the electrons in the space where light is to be emitted is much lower than the potential applied to the anode, which is suitable for excitation, and the magnetic field lines cause the electrons to rotate. In order to do this, the rate at which the electrons are excited increases and the luminous efficiency increases, and furthermore, the annular luminescent space can be uniformly emitted by the swirling movement of the electrons.

[Brief explanation of the drawing]

FIGS. 1(a) and (b) are a top view and a side sectional view showing a schematic configuration of Embodiment 1 of the present invention, FIGS. Embodiment 2 is a schematic perspective view, FIG. 5 is a schematic configuration diagram of a conventional example, and FIG. 6 is an energy distribution explanatory diagram of the same as above, where 1 is a tube body, 2 is a cathode, 3 is a cathode, and 6 is a magnet. be. Agent Patent Attorney Ishi 1) Ai 7 Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] (1) An annular tube in which a low-pressure light emitting gas is sealed, transparent to light radiation, and communicating at both ends, and a thermionic emission cathode disposed inside the tube; In a light-emitting electron tube consisting of an anode arranged inside a tube at a distance from the cathode that is less than the mean free path of electrons, a magnet is arranged so that lines of magnetic force are generated along the circumferential shape of the tube. and a light-emitting electron tube, characterized in that the anode and the cathode are arranged so that a line connecting the anode and the cathode is orthogonal to the line of magnetic force.