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Патент USA US2105138

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Jan. 11, 1938.
J, |_, cox
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GASEOUS Emcmzc DISCHARGE LAMP
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Filed Oc-t.
28,
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2,105,138
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1956
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KNx/ENTOR:
JAMES L. @ox
BY: i
A TTORNE Y.
v
Patented Jan. 11, 1938
'
2,l05,l38
I - UNITED ,_ STATEE
' 2,105,138
GASEOIUS mrzc'rarc niscw
i‘ : »
James L. Cox, Denver's, Mass” ‘assignor to By
grade Sylvania Corppration, Salem, Mass” a
corporation at Massachusetts
Application Uctober 28, K936, Serial No. 108,017
2 Claims. (m. 176-126)
The present invention relates to electric gase
ous discharge lamps, and in particularto such
,lamps which comprise a thermionic electrode
' which is attached to a metal disc used as a sealed
5 closure member for a glass envelope.
An object of the invention is the provision
of a refractory insulating coating for the metal
disc in order to insure that the disc does not
act as an electrode for the discharge.
It is known, for example, that an electric dis
charge lamp can'be made by enclosing a gaseous
atmosphere at the proper pressure in a glass
tube, or other envelo
, whose open-ends are
which generally accompanies the manufacturing
process, and in addition it may allow the disc
to act as a capacity member for starting the dis
charge, and may facilitate the making of the
metal to glass seal during manufacture.
Such an electrode and disc can be used to ad
vantage in any gaseous discharge tube, but par
ticularly in those in which a ?lling of an inert
gas and mercury is used.
'
The drawing shows a side view of a lamp ac- l0
cording to the invention.
'
A vitreous envelope I has the metal discs 2
and 3 sealed to its ends, closing them oil’. Elec
sealed to metal discs, the discs acting as elec
15 trodes. Such lamps require a high voltage, of trodes 4 and 5, attached to the discs may be of .
the order of several hundred, for operation, and the thermionic type, if desired. They are pref- 15
produce sputtering of the electrodes on the glass, erably, but not necessarily, of the wire-wound
blackening the latter. A thermionic electrode of oxide-coated type. They may be attached to
high electron-emitting power can be attached to the metal discs by welding,.or some similar proc
20 the disc, thus reducing the operating voltage and ess. Welding generally weakens the disc, so I
prefer to support the electrode from a wire 8, 9 2o
the sputtering. To secure the proper tempera
ture for such an electrode, it may be made in wrapped in a circular groove “I, ll formed on
the form of a metal wire, wrapped if desired the disc. To permit this wrapping, and to facili
with another wire of smaller diameter, and tate external connection to the disc, the latter
25 coated with a highly electron-emitting material. is preferably provided with a central raised por
The larger wire, of course, can be arranged in tion l2, IS. The refractory insulating coating 6. 25
any convenient geometric shape. If desired, a ‘I preferably covers any wire wrapped around the ,
coated cup or disc of metal can be used instead central portion, thus not only insulating the sur
face of the disc, but helping to make a rigid joint
of the coated wire.
30 Such an electrode will attain, during operation, to the electrode lead.‘ In many cases, the con
necting support between the electrode 4 (or 6) 30
an electron emitting temperature, and thus sup
port the discharge. Its higher emitting qualities, and the disc 2 (or 3) should be covered with in
sulation, to prevent the discharge from occur
will insure that, during normal operating condi
ring to it.
‘
tions the discharge will emanate from it, and not
What. I claim is:
35 from the metal disc. However, during the man-'
1. An electric gaseous discharge lamp of the as
ufacture of the lamp, it is necessary to pass a.
discharge between the electrodes before they are type having a ?lling of an inert gas and mer
rendered thermionically emissive. During such cury vapor and comprising an elongated glass
operation, the discharge tends to, start from the tube having sealed across each of its ends a
40 disc, causing sputtering of the metal, with a metal closure disc with an inward peripherally
_ consequent black deposit on the glass near the grooved protuberance of smaller diameter than 40
metal discs. To prevent this, and to insure that, said disc, a wire wrapped around said protuber
even during the manufacture of the lamp, the ance and in said groove, an alkaline earth oxide
coated electrode supported from said wire, and a
discharge emanates from the thermionic elec
45 trode, we have found necessary the use of a re
fractory insulating material on the inside sur
face of the metal disc. This coating may be, for
example, of alumina. It may be put on as a paste
of alumina, and water, then dried out. If de
50 sired, the insulating coating may be fused to the
metal surface as a sort of glaze. Such a coating
prevents the discharge from attacking the end
cap during the preliminary operation at the lamp
refractory insulating coating over the interior
surface of the, disk and over the wrapped wire. 45
said coating bonding the disk and wire into con
ductive contact and insulating them‘ from the
gas ?lling inside the lamp.
2. An electric gaseous discharge lamp as in
claim 1, in which the refractory insulating coat- 50
ing is of alumina.
JAMES L. COX.
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