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Патент USA US2040883

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May 19, 1936.
Filed May 29, 1935
Patented May 19, 1936
Guillermo Solomon, Santiago, Dominican
Application May 29, 1935, Serial No. 24,148
2 Claims. (Cl. 250-275)
This invention relates to electronic tubes, and
more speci?cally to electronic tubes of the type
that are used in radio detectors and ampli?ers.
It is an object of this invention to provide an
5 improved electronic tube which may be used in
radio detection and ampli?cation and which will
be substantially free from the troublesome out
side interference caused by static or the discharge
in an improved type of shield disposed inside of
the glass casing or envelope It. My improved
from high frequency machines and spark gaps.
A further object is the provision of an improved
type of shielding for radio tubes which willlbe
suitably secured together at the upper end as by
the twisted wire 21. The lower end is tightly 10
tied around the upper end of the glass stud I2 as
by another strip of wire 28, which is preferably
provided with a lead 29 extending through the
glass stud l2 and connecting with a prong 30
which projects through the base of the tube.
The prong 30, when the tube is in use, is con—
economical to manufacture, which will occupy a
minimum of space, and which will not interfere
with the proper operation of the tube.
With these and other objects in mind, reference
should be had to the accompanying drawing, in
an inner layer of insulating material such as the
sheet of dielectric paper 25, which are wrapped
around the plate, grid, cathode and ?lament of
the tube so that they overlap as at 26 and are
nected to a suitable ground 3| so as to cause
all interference entering the tube to be grounded.
Fig. 1 is an elevation of an electronic tube em
bodying the present invention; and
Fig. 2 is a sectional view in the direction of
the arrows on the line 2—2 of Fig. 1.
In the accompanying drawing my invention is
illustrated as applied to a vacuum electronic tube
of a conventional type which is quite frequently
25 used in radio receivers and comprises a suitable
glass casing or envelope l0 enclosing the op—
erative elements of the tube and secured at its
lower end to a base portion ll made of dielectric
shield is composed of an outer layer of metal
foil 24 made of a good conducting material, ‘and
To insure a good electrical contact between the
lead wire 29 and the foil 24 a solder connection 2-0
may be employed. The wire 2! passes through
the upper end of the wrapping or shield in such
a manner as not to contact the layer of foil 24 but
to be insulated therefrom by the paper 25.
An electronic tube embodying a shield of the 25
type illustrated and described herein will be
substantially free from outside interference in
that all static and stray electrons will be
Supported in a glass stud l2 projected upwardly
grounded. The provision of the shield, however,
will not materially increase the cost of producing 30
inside the tube are a series of posts [3 to which
the tube nor will it cause the tube to occupy any
additional space in a radio set.
Of course, it is to be understood thatmy im
are secured the plate [4, the two portions l5 and
I6 of a screen grid, and a control grid I1.
supported in the glass stud I 2 are the cathode I8
35 and the heating ?lament I9. Extending through
the base of the tube are a plurality of prongs 20
adapted to be ?tted into a suitable socket. Two
of the prongs ‘are connected to the two ends of
the ?lament l9, another prong is connected to
40 one portion of the screen grid I6, another to the
plate l4, while the ?fth prong is connected to
the control grid 11. The two portions of the
screen grid 15 and iii are secured together in con
ventional manner as by a metal disk or plate
45 attached over the upper end of the elements.
wire 2| extending through the top of the tube
and connecting with a contact member 22 is
connected to the cathode l8.
While the tube herein shown and described is
50 one type of electronic tube to which my inven
tion may be applied, it is to be understood that
it may be used in association with any desired
type of electronic tube.
To protect the operative elements of the tube
55 from outside interference due to static or to the
operation of high frequency machines or spark
gaps, I encase the operative elements of the tube
proved type of shielding may be applied to elec
tronic tubes of other types than the one herein 35
illustrated and described.
I claim:
1. In an electronic tube, a shield comprising
an outer layer of metal foil and an inner layer
of dielectric material disposed inside the tube and 40
encasing the operative elements thereof, said
layer of metal foil being connected to a conductor
projecting through said tube for connecting it
to a ground.
2. An electronic tube comprising a glass en
velope, a base portion secured to the envelope,
electron emitting means, electron receiving means,
and control means disposed inside of said en
velope and having connection with a plurality of
conductors projecting through the base portion,
and a shield comprising an outer layer of metal
foil and an inner layer of dielectric material dis
posed inside said envelope and encasing said elec
tron emitting, electron receiving and control
means, said metal foil having connection with a 55
conductor projecting through the base of the tube.
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