US1888594A - Vacuum device - Google Patents

Description

ov- 3 F. w. HOCHSYTETTER I VACUUM DEVICE Filed Dec. 4. 1929 2 Sheets-Sheet 1 i s Z" 8 Dm/ecfnc Z UHZHU Mu E31 z Fmdemk w. hochfeffer Nov/22, 1932. F. w. HOCHSTETTER 1,888,594

' VACUUM DEVICE Filed Dec, 4, ;929 2 Sheets-Sheet 2 avwwto'c Patented Nov. 22 1932 UNITED STATES VACUUM DEVICE Application filed December 4,-1929. Seria1'No.41i,408. i

This invention relates in general to improvements in vacuum devices of the type now generally known as audions.

One of the objects of this invention is to provide in multi-electrode audions, novel features of construction, particularly in connection with audions in which the grid or control electrode is dielectrically isolated from the other electrodes.

Another object of this invention is the provision of a construction by means of which the grid is so isolated.

A still further object of this invention is the provision of a construction in audions in which the grid is arranged with respect to the plate so that the electrons in moving to the plate pass by the grid without having their paths of movement intersect the grid.

Another object of this invention is the provision of a corrugated plate electrode in a vacuum device of this type which permits of a plate of large area to receive electrons with respect to the space occupied by it.

Another object of this invention is to associate the cathode and plate of an electron discharge deviceso that the electrons can flow between them without passing through the grid.

These and other objects as will appear from the following description are secured by means of this invention.

This invention resides substantially in the combination, construction, arrangement and relative location of parts, all as will be described in considerable detail below.

Referring to the drawings;

Figure 1 is a view of one form of the device with some parts broken away, and other parts in cross section;

Fig. 2 is a similar view of a modified form of the device;

Fig. 3 illustrates a still further modification; and

Fig. 4 illustrates a third modification.

The principles of construction and operation underlying the vacuum devices of this invention are first a dielectric isolation of the grid with respect to the other electrodes, an arrangement of the electrodes so that the electrons do not flow through the grid, the interposition of a dielectric between the grid and cathode so that 'no grid currentcan flow, and by the construction the elimination of the necessity ofrusingf a grid bias in circuits associated therewith. The best understand-:1.

ing of the 'invention'may be had by dir'ct'ref erence to the drawings. i

Referring. toiFig. '1. the, device isshowir comprising a base 1 and the-usual contact prongs 2 depending therefrom. Securedto the base in the "usual and .well known "man? ner is the evacuated pointed out'that in all forms of 'devices'x'disclosed, the base, prongs and glass shell are the same. Each tube is provided with a reentrant glass supporting stem 4 of the usual construction. The filament 6 in the device disclosed in Fig. 1 is of the so-called hard pin type surrounded by a wire grid 8. Interposed between the filament and grid is an open ended shield 7 of suitable dielectric'or insulating material such as mica, fiber and the like. Placed above these elements is the corrugated plate electrode 9. The filament grid plate and shield are all separated from the stem 4. V y

In the modification shown in Fig. 2 the glass shell'3. It mayibfe filament 6 is horizontal which has the advantage that the hot spot ment is eliminated.

In the form of device shown in Fig. 3 the plate 9 surrounds the other elements andthe filament is supported by the hook bracket 10 in the well known manner.

. In the modification shown in Fig. 4 the filament 6 consists of a straight horizontal portion above which is supported a piece of dielectric material 7 and on which is in turn supported the grid 8. The plate '9 is suptendency of the fila ported above the grid as shown. v By the use 7 of the dielectric supporting wall the necessity of a grid bias is eliminated sincethe electrons cannot flow to the grid during the posi- V tive halfof the single cycle. Instead of corrugating the plate as shown in Figs. 1 and 2, the plate may be roughened on its side adjacent the cathode to increase its area. With the construction of this type the amplifica tion factor of the vacuum tube is increased and by the elimination of the necessity of the grid bias the cost of the circuits associated with such a device is reduced. It is of course understood that the filament in each case may be thoriated or coated with an electronically active substance. In the constructions shown in Figs. 1 and 2 the electrons flow directly to the plate under the influence of the grid field without passing through the grid.

I am of course well aware" that the princ-iples of construction and operation of this 10 invention may be applied in other physical forms without departing from the spirit and scope of, the invention, and I do not, therefore, desire to be strictly limited to the disclosure as given for purposes of illustration, but rather .to the scope of the appended claini.

'iWhat I seek to secure by United States Letters Patent is: v i 7 An 'audion c'oinprising an evacuated vessel, a cathodewithin said vessel, an open ended insulating sleeve surrounding the cathode, a

grid surrounding the sleeveand an anode in alignment with the cathode opposite the open endof the sleeve. V

a In testimony whereof I have hereunto set rlny hand on this 3rd day of December A. D.,

929,, v v I v FREDERICK W. HOCHSTETTER;

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