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Патент USA US2086057

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July?, 1937.
’
'
H.' |_. VAN DER HORST
GRID CONTROLLED DISCHARGE TUBE
Filed June V15, 1936
By
/%
2,086,057"
Patented July 6’, 1937
2,086,057
UNITED STATES PATENT OFFICE
2,086,057 ..
GRID CONTROLLED DISCHARGE TUBE
Hajo Lorens van der Horst, Eindhoven, Nether
lands, assigno-r to N. V. Philips’ Glceilampen
fabrieken, Eindhoven, Netherlands
Application June 15, 1936, Serial No. 85,413
.
' '
In Germany July 19, 1935
_
>
5 Claims. (Cl. 250-275)
My invention relates to grid-controlled dis-_ tube having a plurality of control grid members
charge tubes and more particularly to incan
whose corresponding ignition characteristic
descible-cathode ionic relay tubes having a plu
curves are identical.
5
rality of control grids.
By the term “ionic relay tubes” as used herein
is meant grid-controlled recti?er tubes having a
gaseous ?lling comprising one or more gases,
vapors, or a mixture thereof. Such tubes, which
are used in relay circuits and also as current con
10 verters of different kinds, for instance, recti?ers,
frequency-changers, and inverters, do not as a
rule operate continuously, and the anode current
is not established until after the anode'igniting
voltage-which is governed by the grid poten
15 tial-has been reached. Furthermore, as the
grid does not recover its blocking e?ect until
after the anode current has become zero and the
discharge path has become deionized, the origi—
2 o.
2
nally-established anode current cannot be con
tinuously biased as is done with a high-vacuum
triode.
When an ionic relay tube is provided with a
plurality of control grids there is considerable
di?iculty in securing for all the grids the same
ignition characteristic curves, i. e. anode ignition
voltage-grid potential curve. This is because in
both types of grid constructions now used, one
grid is arranged nearer the anode than are the
remaining grids, i. e. the grids are arranged either ’
successively in the discharge path or concentri
cally with the larger grids surrounding the
smaller ones.
Although it has been proposed to overcome this
di?iculty by symmetrically arranging a plurality
of equally-dimensioned grid members in an equi
potential surface of the electrostatic ?eld set up
between the anode and the cathode, such con
In accordance with my invention, I provide be-'
tween the anode and cathode a grid structure
comprising a plurality of equally-dimensioned
grid members arranged symmetrically to the axis
of the electrostatic ?eld set up between the anode
and cathode and comprising portions traversing Y
the discharge space between cathode and anode 1d .
in an equipotential surface of said ?eld so as to
form a single aperture arranged symmetrically
with said axis and serving as the only passage for
the discharge.
‘
.
.
In one embcdimentof my invention, the grid .
structure has the form of a cylindrical box sur
rounding the cathode and comprising a plurality
of sector-shaped mutually-insulated grid mem
bers spaced apart to form radial slots serving as ,- y
the
arrange
onlythe
passage
box-like
for grid
the structure
discharge.symmetrically
I prefer to N).
to the cathode and axially of the tube, and to
locate the anode centrally with and immediately
above this structure. To prevent starting of the
tube at the normal anode voltages,‘ I make the
radial slots of su?iciently small width, whereas I 5
provide in the structure opposite the anode a cen
tral aperture symmetrically circumscribed by the
grid members and controlling by its area the ig
nition characteristic curves of the tube.
In order that my invention may be clearly un 30
derstood and readily carried into effect I shall
describe same more fully by way of example, with
reference to the accompanying drawing, in
which:
‘
Figure 1 is a partly sectionized side view of an 35
structions provide very irregular ignition. This
ionic relay tube according to the invention, and
is due to the fact that the grid members, sim
2-4 of Fig. 1.
40 ilarly to a tubular grid, delimit a plurality of con
trol apertures and thus do not insure a uniform
control.
In both types of grid constructions, the igni
iion characteristic curves for the various grids,
clue to discrepancies in the electrostatic condi
tions, will not be exactly the same. Such con
structions are unsuited for those applications in
which it is essential that the ignition character
istic curve of all the grids be exactly the same,
for example, in circuit arrangements in which
two grids must alternately perform the same
function, or in which a relay tube must be biased
in an identical manner from two di?erent sides.
The object of my invention is to overcome the
above draw-backs and to provide an ionic relay
5
Figure 2 is a sectionized View taken along line
'
The ionic relay tube shown in the drawing
comprises an envelope I having at its bottom a
reentrant portion forming a press 2 and contain
ing a gaseous ?lling, for instance argon at a r '
pressure of 0.5 mm. Supported from press 2 by
lead-supports 3 and 4 is an incandescible cathode. gs
5. Centrally disposed above the cathode 5 and 5
supported from press 2 by means of a lead-sup
port l4 provided with one insulating sleeve [6 is
a disc-shaped anode 9.
.
Between the anode 9 and cathode 5 is a box
like grid structure 20' comprising two-sector
shaped grid members 6 and ‘I supported from
press 2 by means of support-leads l2 and I3 re
spectively, and forming a single aperture in the
shape of a radial slot I0 (see Fig. 2) lying in an 55
2,086,057
2
equipotential surface of the electrostatic ?eld set
up between the cathode 5 and anode 9. The slot
II] is given a sufficiently small width to prevent the
discharge from passing therethrough at the nor
mal anode voltage. The bottom of structure 20
is closed by a screen i5 of insulating material
supported from lead supports 3 and 4, whereas
the lower edges of the grid members 6 and 1, and
the screen 8 are protected from the discharge by
10 a cup-shaped member 15 of mica supported from
support 3.
'
Arranged centrally with respect to the anode 9
and formed half by grid member 6 and half by
grid member ‘I is an aperture H which permits
the discharge to pass to the anode and whose
cross-sectional area governs the ignition char
acteristic curves of the tube.
Due to the symmetrical arrangement and
identical shape of the grid members 6 and ‘I, the
20 ignition characteristic curves of the tubes com
prising two grids agree to a marked extent.
I have found, that when the slot H! was given
a width of about 0.25 mm. it was impossible to
initiate starting of the tube at a normal anode
25 alternating voltage of about 170 volts and that
it was necessary to give the central aperture H a
diameter of about 5 mm. to enable normal oper
ation of the tube at this anode alternating volt
age and with a gas ?lling of argon at a pressure
30 of 0.5 mm. of mercury.
‘ While I have described my invention in connec
anode and cathode and comprising a plurality of
mutually-insulated identical grid members de
limiting said discharge path along a curve lying
substantially within an equipotential surface of
the electrostatic ?eld set up between said anode
and cathode, and comprising portions forming a
single aperture arranged symmetrically to the
axis of said ?eld and allowing the passage of a
discharge, said members blocking the remainder
10
of the discharge path.
3. An ionic relay tube comprising an envelope,
an anode and an incandescible cathode within
said envelope and spaced apart to form a dis
charge path, and a circular box-like grid struc
ture comprising a plurality of mutually insulated
sector-shaped grid members forming for the only
pasage of the discharge a single radially-ex
tending aperture arranged symmetrical to the
axis of the electrostatic ?eld set up between the
anode and cathode, the edges of said members
bounding said aperture and delimiting said dis
charge path lying substantially in an equipoten
tial surface of said ?eld.
4. An ionic relay tube comprising an envelope,
an incandescible cathode, a box-like grid struc
ture arranged symmetrically to said cathode and
axially of the tube and comprising a plurality of
sector-shaped grid members, and an anode ar
ranged above said grid structure and centrally
therewith, said grid members having between 30
them, as the only passage for the discharge, a
tion with speci?c application and examples, I
single aperture constituted by radially-extending
do not wish to be limited thereto but desire the
appended claims to be construed as broadly as
slots of small width to prevent initiation of the
discharge therethrough at the normal anode volt
ages and a central portion whose size controls 35
the ignition characteristic curve of the tube.
5. An ionic relay tube comprising an envelope,
35 permissible in view of the prior art.
’ What I claim is:
. 1. An ionic relay tube comprising an envelope,
an anode and an incandescible cathode within
said envelope and spaced apart to form a dis
40 charge path, and a grid structure between said
anode and cathode and comprising a plurality of
similar grid members insulated from each other
and symmetrically cooperating to form a single
aperture for the passage of the discharge and
45 interrupting the remainder of the discharge path,
the edges of said members bounding said aper
ture lying substantially in an equipotential sur
face of the electrostatic ?eld set up between said
anode and cathode.
2. An ionic relay tube comprising an envelope,
50
an anode and an incandescible cathode within
said envelope and spaced apart to form a dis
charge path, and a grid structure between said
an incandescible cathode, an anode, and a multi
ple grid structure between said anode and cath
ode and comprising a plurality of sector-shaped 40
members forming a single aperture as the only
passage for the discharge between said anode
and cathode, said aperture having a central por
tion whose area controls the ignition character
istics of the tube, and radially-extending slots of 45
small width to prevent initiation of the dis
charge therethrough at the normal anode volt
ages, the edges of said members bounding said
central portion lying substantially in an equi
potential surface of the electrostatic ?eld set up 50
between said anode and cathode.
HAJO LORENS VAN DER HORST.
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