SU397105A1 - Electronic lamp - Google Patents

Description

The invention relates to the field of electronic devices intended for use in amplifiers of distributed amplification (ASM), as well as in other radio devices.

Electron tubes are known. For example, tetrodes containing a cathode, control and screen grids and an anode, on the inner surface of which cameras are arranged to reduce secondary emission, are formed by the side walls of the ribs and the bottom.

However, in such l.amps, due to the distortion of the electric field due to physical inhomogeneities introduced in the field by grid electrodes, the primary electrons are observed to deviate from the direction normal to the anode. In this connection, the electron flux of the primary electrodes bombards not only the bottom, but also the side walls of the chambers, as well as the end surfaces of the fins, causing secondary emission from these surfaces. Bombing takes place at various angles to the indicated. surfaces, cams, which further increases secondary emissions. Cameras working like

mechanical catchers of secondary electrons are ineffective, or only some of the secondary electrons knocked out from the bottom and adjacent to the bottom surfaces of the side walls of the chambers are caught; the other part of the secondary electrons emitted from the ends of the edges, the chambers and the surface areas of the chamber walls adjacent to the ends are not caught by the camera and go beyond its limits. As a result, the screen grid current, due to the secondary electrons, increases, the residual voltage increases, which leads to a decrease in the vibrational power and kp, d-lamp.

The proposed electronic lamp differs from the known one in that its cathode is made with non-emitting zones on its surface, located in places of normal projections of each edge of the anode chambers on the cathode surface, and the width of the non-emitting cathode zone exceeds the anode width by an amount equal to 0-50% pos. farther.

Claims (1)

This makes it possible to improve the current distribution over the screen grid, decrease the residual voltage, and increase the efficiency. and oscillating power of the lame. FIG. 1 shows a general view of the proposed electron lamp with a longitudinal edge; 2 shows the electron-optical system of the lamp; in fig. 3 - anode lamp characteristic. We offer an electron luminae that contains the cathode assembly 1, the control grid 2, the screen grid 3, and the anode 4. The electrodes are arranged coaxially. The cathode assembly 1 consists of a core 5, covered with an oxide layer 6, and a heater 7, located inside the cathode. There are annular non-emitting zones 8 on the cathode. A control grid (such as a squirrel wheel) is formed by rods 9. A screen grid of the same type is made of rods Yu, The rods 10 of the screen grid are located in the shade of the rods 9 of the control grid. On the inner surface of the cylindrical anode there are ring-shaped cells 11 formed by ring-shaped ribs 12, a part of the internal surface of the anode located between the ring-shaped edges and forms the bottom of 13 chambers. The surface of the ribs 12 facing inward kam.er, form the side walls of the 14 chambers. The narrow surface of the annular ribs facing the cathode forms the end surfaces of the 15 chambers. In places of normal projections of each anode edge on the cathode surface, annular non-emitting zones are located. 8. The width of the non-emitting zone is equal to or equal to the width of the rib 12, preferably by 20-50%. FIG. The dotted lines in Fig. 2 show the electron flow partitioned into parts 16, which are directed to the bottom 13 of the block 11 of the anode. FIG. The 3 dashed lines 17 and 1 show the characteristics of ijj. |: (U) u. (U) of a common tetrode. Flat lines 19 and 20, respectively, show the characteristics of the tetrode, which has a cathode with non-extinct zones, located in places of normal projections of each anode edge on the cathode. The presence of non-emitting zones on the cathode covered by the oxide layer leads to the fact that the entire electron flow is divided into parts 16. As a result of this separation, the non-emitting cathode zones 8 located under the anode fins 12 do not emit an electron flow Thanks to this, the end 15 and side 14 chamber surfaces are bombarded by primary electrons. Thus, virtually all of the electron flow is directed to the bottom of the chambers, which significantly reduces secondary emission from the anode. As a result, the residual voltage at the anode decreases by about 3 times. The proposed electron lam.pu can be used both with negative and ari positive, the voltage on the control grid; efficiency the lamps, when operating on a low-resistance broadband load, increase by 3 times, when operating on a high-resistance narrowband load, kp, and the oscillating power increases by approximately 40%. The description shows one of the possible variants of lam.py designs. The offered electronic lamp can be made with a flat electrode system. In this case, non-emitting zones, in places of normal projections of each anode edge, are also provided on the cathode, which are used to exclude the primary electron flow of the end and side surfaces of the anode edges from bombardment. If there are focusing metal elements on the control grid, made in the form of bridges, the grid is positioned in such a way that its focusing metal elements are in the same plane with the anode edges and non-emitting cathode zones, and the width of the non-emitting zone on the cathode exceeds the width focusing metal element control grid 1.5 - 5 times. Claims of the invention Electron lam.p., comprising a cathode, combined control and screen grids, a chamber anode, whose chambers are formed by edges arranged perpendicular to the surface of the cathode, characterized in that, for the purpose of improving efficiency. and the oscillating power of the lamp, non-emitting zones created on the working surface of the cathode are located in m. of normal projections of each anode edge to the cathode, and the width of each non-emitting zone of the cathode exceeds the width of the anode edge by an amount equal to 0-50% of the last. 1. X X nineteen