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Патент USA US2087754

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July 20, 1937.
Filed Oct. 28, 1936
Leonard J. Dav: 5
BY we‘!
Patented July 20, '1937 _
Leonard J. Davies, Rugby, England, assignor to
General Electric Company, a corporation of
New York
Application October 28, 1936, Serial No. 108,113
In Great Britain November 1, 1935
1 Claim.
(Cl. 176-122)
‘ This invention relates to electric discharge
lamps and more particularly to lamps in which
the discharge takes place in a vapour or gas.
It has been found possible to increase the
wattage input to such lamps, and thereby in
crease the light output and. the intrinsic bril
liancy of the lamp, by operating them under arti
?cially cooled conditions. Since for high effi
ciency such lamps are constructed‘ to operate on
m voltages of between 100 and 1000 or even higher,
with some liquids used for cooling, and especially
if water is used, electrolysis currents may ?ow
in the water between the lead in wires to the
lamp. While this is not detrimental to the light
15 output or to the e?iciency, since only a small
portion of the total energy is consumed in elec
trolysis, it does give rise to trouble connected with
the inleads to the lamp, for these are rapidly
dissolved and the lamp fails through this reason.
20 This electrolysis may be prevented by preventing
_ access of liquid to the leads by shielding them
with insulating material, but in order to cool the
seals of the lamp it is desirable that the cooling
liquid should have free access to the leads, or
method of capping the lamp, in such a way that
the caps can be put on with the lamp held in a
jig, so that the light center is always symmetri
cally axial and at the correct distance from the
caps, which means that the lamp can be easily 5
plugged into a holder situated in an optical de
vice where it is important to secure the correct
location of the light source. The large size of
such caps furthermore mean that considerable
electrolysis can take place before any serious 10
diminution in the size of the inleads occurs. Fur
thermore the thermal conduction along the in
lead secures that the actual seals in the lamp are
kept at a reasonably cool temperature and pre
vent trouble arising from the melting, or destruc- 15
tion by heat of the seals.
If it is desired to prevent electrolysis completely
then such caps or “enlarged” inlead wires may
be painted with an insulating paint or varnish or
coated with vitreous enamels, since the large area 20
ensures su?icient cooling of the inleads even
though thermal conduction is hindered by the
presence of a poorly conducting varnish or
25 that the leads should be so designed that even
if they are protected by a coating of poor ther
mal conductivity they can lose a good deal of
A further feature of the cap additions to the 25
lamps, described above is that they can be ar
ranged to‘ extend over the lamp for varying dis
heat to the liquid.
The object of this invention is to provide an
30 improved arrangement of lead-in wire and ter
tances and thus by the heat shielding they offer,
a?ect the electrical characteristics of the lamp,
minals for such lamps so that they can be op
erated in cooling mediums in which electrolytic
action may take place without the inleads being
The lamps to which this invention applies
more speci?cally are, to give a typical example,
constructed of quartz of approximately 1A" in
diameter and are tubular in shape. An electrode
is sealed in at each end and inleads correspond
4O ‘ing to these electrodes extend from each end.
To overcome the trouble due to electrolysis dis
solving away these inlead wires, and also to pro
vide a lamp that is readily interchangeable in
a suitably designed holder I propose extending
4 01 the tubular shape of the lamp at each end by
tubes of copper or other high conductivity metal,
or metal designed specially to reduce electrolysis.
To support these extension pieces and to provide
electrical and thermal conduction from the in
50 leads to them, the space in between the inlead
which passes down the centre of this tube and
the inner wall of the- tube is ?lled with a good
conductor of electricity of a suitable nature, such
as lead. The extension is further secured by
55 paste if necessary. This provides a simple
should such‘ a control be found desirable.
In the drawing accompanying and forming"
part of this speci?cation an embodiment of the
invention is shown in a side elevational, partly
sectional View.
Referring to the drawing the'gaseous electric
discharge device comprises an elongated tubular
container l having an outside diameter of about
one quarter of an inch. Said container i has
electrode chambers 3 and 4, one at each end
thereof. Said electrode chambers 3 and 4 have
electrodes 5 and 6 mounted therein, respectively,
and a quantity P2 of mercury therein in which
the electrodes 5 and b are immersed for the
greater part of their length. The structure and 45
operation of gaseous electric discharge lamp de
vices of this type are described in the co-pending
application of Cornelis Bol, Willem Elenbaas, and
Hendricus J. Lemmens, Serial No. 46,952, ?led
October 26, 1935 and assigned to the assignee of 50.
the present application. The lamp illustrated is
provided with and mounted in a ?uid cooling
system (not shown for purposes of simplicity.)
Metal tubes 1 and 8 are mounted on said elec
trode chambers 3 and 4, respectively, and said 55
tubes 1 and 8 are coaxial with the current leads
9 and HI, respectively. Each of said tubes 1 and
8 are made of metal having good electrical con
ductivity characteristics, such as copper. The
5 space between the tubes 1 and 8 and the leads
9 and Ill, respectively, is ?lled with a metal body
ll having good electrical conductivity charac
What I claim as new and desire to secure by
Letters Patent of the United States is:
A gaseous electric discharge device comprising
in combination a tubular- container tapered at
each end, electrodes and electrode leads sealed
therein, a vaporizable material therein,v a current
lead extending therefrom, a tube of electrically '
conducting material surrounding said current
The advantages and modi?cations of lamps ' lead, said tube being appreciably larger in diam
10 of the above type have been pointed out above eter than said current lead and having approxi
and it will be understood of course that I con
mately the same diameter as said container, the
template that still i'urther changes and modi?
tapered end of said container extending into
cations may be made in the device illustrated and said tube and an electrically conducting solid
described without departure from the spirit and body ?lling said tube.
15 scope of the invention.
teristics, such as lead.
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