US1720724A - Electron-discharge device - Google Patents

Description

July 16, 1929.

E. T. FISK 1.720.724

ELECTRON DISCHARGE DEVICE Filed July 16, 1924 E. Jr l b/@1517 Patented July 16, 1929.

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ERNEST THOMAS FISK, 0F SYDNEY, NEW SOUTH WALES, AUSTRALIA.

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Application filed July 16, 1924, Serial No;

The desired concentration of the electrons is obtained by an improved construction of device in which the concentration of the electron stream into a beam is achieved more effectively than heretofore by setting up a reflecting force behind an electron emitter and this is supplemented by giving the said reflector a negative electrical charge.

Substantially the whole mass of emitted electrons can thus be concentrated and directed towards an anode by these means. The whole of the active portion of the electron emitter maybe contained within the field of the reflector and constructed and supported in a more robust form than is otherwise practicable; for instance a filament may be wound inxthe formof a flat or volute spiral, preferably with its negative end in the centre. 1

- By operating a plurality of such electron discharge devices in parallel a high power arrangement for various purposes is obtainable.

Unless operated upon by opposing or modifying forces, a beam of. electrons will remain in the direction determined by the concentrating and reflecting forces. The direction and/or intensity of the beam, can, however, be independently controlled by suitably, directed electric or magnetic forces applied byknown methods. For instance,

the direction of the beam may be controlledby electric charges or magnetic fields acting transversely or at an angle to .its path, or any useful combination of such methods may be employed.

Instead of the beam being deflected by an electric field it may, if preferred, be deflected by a transverse magnetic field.

Various methods of utilizing the invention in systems utilizing alternating or pulsating currents are readily devisable, the

- essential features of which is to utilize the beam as a tap impinging on target anodes to enable energy to flow from a source of 726,396, and in Australia August 9, 1923.

potential and to bring it into an operative circuit.

Referring to the illustration 16 represents an evacuated envelope, 26 is a reflector of parabolic or other shaped section with a cathodic'filament 22" that is adapted to glow on the passage of an electric current. The filament is located in the region of the focus of the reflector, which latter, when in use, is charged negatively in respect to the polarities of the filament. The envelope is provided with two anodes 87 and 88 and with two deflector plates 83 and 81L oppo- 1 sitely disposed.

The central. portion of the filament 22 is preferably in the shape of a volute spiral, or it may be in any other appropriate shape such as a curl as shown.

The operation of the electron discharge device will be described when used as a rectifier an arrangement of circuits being illustrated in the drawing.

In this arrangement 80 is a source of alternating current contained in a circuit which includes the. in ductances 63, 64 and 65. The inductance 63 is magnetically coupled with the inductance 62, forming a transformer. The secondary of this transformer 62 is tapped by a line 81 to the output circuit. The inductance 64 is magnetically coupled with an inductance 82, one terminal of which is conncted'to the deflector plate 83 in the envelope 16, its other end being connected to the complementary deflector plate 84. The inductance 65 is magnetically coupled to the inductance 85. The terminals of the inductance 85 are connected to the respective ends of the filament 22, and the other side of it to the other end of the fila-.

ment. One (86) of these connections is extended to form one side of the output circuit. The filament being heated by the current "induced in inductance 85, the electron stream which is discharged fromit is reflected from the reflector 26 from which it is separated and directed between the two deflector plates in the form of abeam. The

current alternating in the inductances. 63,

. to the filament and thence through the output lines 81 and 86.

What I claim as my invention and desire envelope, deflector plates disposed on oppo- Y to secure by Letters Patent is pair of 1. A rectifying circuit for alternating current comprising in combination an electron discharge device having an envelope, an electron emitter within said envelope, a anodes within the said envelope, deflector plates disposed von opposite sides of the electron beam emitted by said electron emitter, a source of alternating current, a plurality of transformers each having primary and secondary windings, the primary winding of each transformer being in' cluded in a circuit with said source of alternating current, the secondary winding of 25.

one of said transformers having its opposite terminals connected to the two anodes, one terminal of the output circuit being taken from a tap of said secondary windings, the secondary winding of another of said transformers having its opposite terminals connected to the two deflector plates, said electron emitter being connected in series with the secondary winding of another of said 'opp osite disposed behind electron reflector said emitter and adapted to be negatively charged, a pair of anodes within the said site sides of the electron beam emitted by said electron emitter, a source of alternating current, a plurality of transformers each having a primary and secondary winding, the primary winding of each transformer being included in a circuit with said source' of alternating current, the secondary winding of one ofsaid transformers having its terminals connected to the two anodes, one terminal of the output circuit being taken from a tap of said secondary winding, the secondary winding of another of said transformers having its opposite terminals connected to the two deflector plates, said electron emitter being connected in series with the secondary winding of another of said transformers, and the other terminal of the output circuit being connected to the electron emitter.

In testimony whereof I affix my signature.

ERNEST THOMAS FISK.

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