US1947514A - Three-electrode vacuum tube - Google Patents

Description

Feb. 20, 1934. J 1 U 1,947,514

THREE-ELECTRODE VACUUM TUBE Original Filed Aug. 29. 1931 INVENTOR JACQUES BIGUET ATTORNEY Patented Feb. 20, 1934 THREE-ELECTRODE VACUUM TUBE Jacques Biguet,

Lyons, France Original application August 29, 1931, Serial No. 496,554, and in France October 23, 1915. Divided and this application May 28, 1932.

Serial No. 614,243

5 Claims.

This invention relates to improvements in vacuum tubes of the audion type and more particularly to a type of anode construction for use in such tubes. The subject matter of this application is divided out of my application, Serial No. 496,554, filed August 29, 1921, which has matured into Patent No. 1,861,107, dated May 31, 1932, and wherein the means for mounting the several elements of the tube is particularly claimed.

In the annexed drawing, wherein like reference characters are used to designate similar elements, Figures 1 and 2 illustrate two views of the apparatus, taken from two opposite directions.

Figure 3 is a view of the stem with the leads sealed therein.

Figure 4 is a similar view showing the leads in their final shape before mounting the several electrodes.

Figures 5, 6 and 7 illustrate perspective views of difierent types of plate electrodes that may be used.

Into the bulb A is introduced and sealed into the neck of the bulb, in the same way as in the ordinary incandescent lamp, a stem or support B on which are previously fixed or mounted the plate C, grid D and the filament E.

Each of these elements is connected to the pins of the base F by conductors or leads sealed into the stem B.

This stern, represented alone in Figure 3, is formed, as in ordinary lamps, of a flared glass tube with a press into which are sealed the leads a, b, c, (1, each of which consists of an outside lead c of copper, a platinum or equivalent leading-in wire f, and an inside lead 9, preferably of nickel or chrome-nickel.

These leads are during manufacture of the tube given the definite shape illustrated in Figure 4. The plate (Figure 5) is formed of a sheet of metal rolled into cylindrical shape and extended at the middle by one or two hooks m and m each provided with a recess, into which is introduced and pressed the corresponding lead It. Another meth 0d of construction can also be employed, such as illustrated in Figure 6. Instead of a solid plate it can be made of a trellis or tissue of tungsten wire as shown in Figure '7.

The coil or grid D illustrated is composed of a wire of suitable diameter, preferably of tungsten or any other highly refractory metal, rolled helically and having two straight ends which may be clamped or soldered to the ends of a cross bar it which is carried by the lead d, as indicated in Figure 4.

The rectilinear filament is stretched between the two leads 2' and :i, shown in the same figure, which may be flattened or lengthened in any manner to give them sufficient elasticity with a View to removing any danger of the filaments breaking.

The three elements of the device being concentrically placed give their maximum effectiveness, especially with regard to the phenomenon of saturation. Moreover, the squat shape of the whole ensures a greater solidity to the apparatus.

When it is employed as generator of maintained waves, the energy expended can be such that the cylindrical plate may be carried to a high temperature; in that case it is advisable to employ a plate of refractory metal such as tungsten. Likewise, the conductors or leads serving as supports to the three elements may be of molybdenum or of tungsten; their section may be rectangular instead of being circular, or divided into several wires of minimum section in order to ensure their cooling.

I claim:

1. An electron discharge tube having a cathode and a control electrode made of a trellis of wire.

and a plate electrode 2. An electron discharge tube having a cathode and a control electrode and a plate electrode made of a trellis of tungsten wire.

3. In an electron discharge tube, an anode made of metallic wire cloth.

grid.

JACQUES BIGUET.

CERTIFICATE OF (IORREGTION.

Patent No. 1,947,514. February 20, 1934.

J AGOUES BIGUET.

tit'ied that the above numbered patent was erroneously issued whereas said Letters Patent should have been issued to Radio Corporation of America, New York, N. Y., a corporation of Delaware, as assignee of the entire interest in said invention as shown by the records of assignments in this office; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 19th day of June, A. D. 1934.

Bryan M. Battey It is hereby eer to the inventor said "Jacques Biguet" Acting Commissioner of Patents,

(Seal)

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