US1707275A - Vacuum-tube device - Google Patents

Description

April 1929- l, E. MOUROMTSEFF VACUUM TUBE DEVICE Filed April 28. 1925 INVENTOR [/[0 E. Mawvmfse/f WITNESSES:

ATTORN EY Patented Apr. 2, 1929.

UNITED STATES PATENT OFFICE.

ILIA EMMANUEIi MOUROMTSiEFF, OF WILKlINSBURG, PENNSYLVANIA, ASSIGNOR T WESTINGHOUSE ELECTRIC & MANUFACTURING COMPANY, .A CORPORATION OF PENNSYLVANIA.

VACUUM-'1 Application filed April 2 My invention relates to vacuum-tube devices and particularly to structural details of such devices which are adapted for the translation of relatively high electrical energy values.

An object of'my lnvent on is to provlde a high-power oscillator trlode with a. grid lead whlch is capable of carrying a substantial ambunt of current.

Another object of my invention is to provide a grid lead construction adapted for convenient insertion through a seal.

Another object of my invention 1s to simplify the structural details of vacuumtube devices.

In the prior art, triode tubes have been constructed which are adapted to the translation of power as great as 10 kw. of electrical energy. These triode devices are adapted to the generation of radio-frequency oscillations. Such devices function adequately at frequencies of the order of about 1500 kilo-cycles per second without particular difficulty, but at higher frequencies of generation difficulty has been experienced in leading to the grid, or control electrode, the necessary charging, current to cause the operation of generation to take place.= The tubes as previously constructed, were builtwith a wire conductor sealed through a portion of the glass container. Within the container, a coiled flexible wire of smaller diameter was attached -'to the seal Wire and was also attached to a wire leading to the grid structure. The operation of sealing the conductor through the glass required that a portion'of the lead within the container be flexible. This was conveniently attained by the coiled wire mentioned.

However, when the triode was used for the generation of frequencies above the order of about 1500 kilo-cycles, the small size and coiled character of this wire resulted in the generation of an undesirable amount 7 of heat therein by reason of ohmic losses, eddy currents, and the skin efiect in the coiled .conductor. -Myinvention provides a simplified, flexible grid lead which is adapted to be conveniently sealed through the glass of the container, and which has a sufliciently high conductivity to reduce losses to such value that difliculty enced.

Other objects and structural details of my invention will be apparent from the following description when read in connection with the accompanying drawing wherein,

Figure 1 is a view in vertical sectional elevation of a triode containing an embodiment of my invention; and

Fig. 2 is a detail View ofth tion of a grid lead therein.

Referring to the figures, a metal shell electrode 1 is attached to a glass closure 2 by a seal 3. Within the metal shell 1 is positioned a filamentary cathode 4 and a control electrode 5 having a supporting member 6 clamped to a re-cntrant portion 7 oi the closure 2. To the control electrode support 6 is attached a conductor 8., A conductor 9 is suitably sealed through the wall of the glass closure 2. Connection is made between the conductors 8 and 9 by a number of strips 11 preferably flattened and of conducting material which may be connected, as by spot welding, at their respective ends to the conductors 8 and 9 and may be fur ther held in position by wire wrappings 12 and 13.

The conductors 8 and 9 are preferably of tungsten or molybdenum and the connector portions 11 areprefe'rably strips of molyb- L denum. The binding wires 12 and 13 are also preferably of molybdenum.

The strips of molybdenum ofler sufficient conductivity to the current to permit conduction therethrough without excessive resistivelosses. Likewise, the fact that the conductive pieces are bent through only a portion of a turn instead of being coiled as was previously done removes the inductive action which produced the skin cited. in prior constructions, resulting in increased losses. My construction also reduces the eddy currents and thus removes a large part of such losses. Thus, the conductive lead ismaintained at a satisfactory temperature during operation of the tube.

In the'assembly of .the' device, the flexibility of the'strips of material 11 is sufiicient to permit the construction of a satisfactory. seal for the conductor 9 through the glass 2.

By means of this construction, I am enwith heating is not experiefiexible perabled to simplify the manufacture of a vacuum-tube device and to improve its operating characteristics.

While I have shown but a single emhodiment of my invention, it is capable of various modifications thereof and it is desired, therefore, that only such limitations shall be. imposed thereon as are required by the prior are or indicated in the appeni led claims.

I claim as my invention:

1. In a space current device, the combination of a container comprising a metallic portion and a vitreous portion, said metallic portion comprising an anode,a control electrode and a filamentary cathode Within said container, a lead sealed in a side Wall of said vitreous portion, and a lamellar connection between the inner end of said lead and said control electrode.

2. In a space current device, the coml ination of a container comprising a metallic portion and a vitreous portion, said metallic portion comprising an anode, a control electrode and a filamentary cathode within said container, a lead sealed in a side wall of said vitreous portion, and a connection between the inner end of said lead and said control electrode, comprising superposed laminations; of molybdenum.

In testimony whereof, I have hereunto subscribed my name this 22nd day of April, 1925.

ILIA E. MOUROHTSEFF.

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