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Oct. 15, 1946.
Filed March 50, 1944
His A‘k't'orneg.
Patented Got. 15, 1946
Eric Kettlewell, Kingsbury, London, England, as—
signor to General Electric Company, a corpo
' ration of New York
Application March'30, 1944, ‘Serial No. 528,661
‘In Great Britain April 3, 1942
2 Claims. (of. 49-925)
This invention relates to devices of a type com
prising an envelope of quartz or similar refrac
tory or vitreous material with an electrode there
in and means of current lead connection to the
exterior sealed through a part of ‘the envelope
structure. -The invention involves novelty in
methods of manufacture, as well as in construc
tion. The invention is especially applicable to
strips projecting therefrom as tags or “stream
ers,” the wrapped portion being welded to the
electrode. And with respect to steps (3) and (4),
it is desirable, in the case of a relatively massive
electrode member, that the quartz core have sub
stantially the same external shape of cross-sec
tion as the adjacent end portion of the elec
trode-for instance, if the electrode is a cylin
high pressure metal vapor discharge devices, in- » drical rod, the core may be a rod or tube of about
eluding mercury vapor lamps which in operation 10 the same external diameter-and-that the quartz
sleeve should be collapsed upon most or all the
dissipate power considerably exceeding 1 kw.
The current connections of such discharge de
vices are usually carried through the quartz or
wrapped part of the electrode.
It is generally
undesirable to collapse quartz upon the un
wrapped part of the electrode.
other vitreous envelopes by means of strip-form
lead seals, comprising strips of sheet metal (often 15 By way of example, one embodiment of the
so thin as to be quite properly termed foil) em
bedded in the vitreous material while it is sof
tened or fused by heat. Besides the delicacy or
invention will now be described with reference to
di?lculty of making such joints, there is the prob
electrode assembly constructed as above indi
the accompanying drawing, in which:
,Fig. 1 is a perspective or tilted side view of an
lem of making satisfactory electrical and me 20 cated; Fig. 2 is a side view of a complete dis
charge device embodying this electrode; Fig. 3
chanical connection between the thin strips and
is a fragmentary, sectioned elevation of the elec
the electrode member to which they lead, par
trode assembly; and Fig. 4 is a perspective view of
ticularly when this member is relatively massive,
a modi?cation of the foil lead-in conductor.
as well as of ?rmly supporting the member.
In Fig. l, a relatively massive refractory metal
It is an aim of this invention to overcome such 25
electrode of a high pressure metal vapor electric
di?lculties by improved constructions and
lamp is shown as a tungsten rod or cylinder I,
methods. Various other features and advantages
which may be 30 mm. long and 71/2 mm. in diam
of the invention will appear from the following
description of a species or form of embodiment
eter, for example. Refractory sheet metal or foil
and. a mode of fabrication, and from the draw 30 for the electrode wrapping and the seal strips may
consist of molybdenum sheet 0.015 mm. thick. A
In manufacturing a quartz envelope device in
band 2 of this foi1 (15 mm. wide, for example)
is wrapped around one end of the electrode mem
accordance with the invention, in the form here
inafter described, (1) a part of a refractory metal
ber I and welded to it. Two strips 3, 3 of the
sheet molybdenum (each 10 mm. wide and 40
electrode member (preferably cylindrical) is
mm. long, for example) are each weldedv at one
wrapped with thin refractory sheet metal or foil,
end to the wrapping 2, while at the other end
which is ‘welded to the electrode at a plurality of
each strip is welded to a stout external wire lead
places, (2) thin strips of refractory sheet metal
4, which may be multistranded as shown. Using
or foil adapted for a strip seal are attached and
electrically connected to the wrapping, and thus 40 a cylindrical quartz rod (also 71/2 mm. in diam
eter) as the core 5 in alignment with the elec
to the electrode, (3) the electrode and a quartz
trode rod l-——and as shown forming as it were a
core in line with it are placed within a quartz
prolongation of the electrode-the lead strips 3, 3
tube or sleeve with the metal strips extending
and the core 5 are both inserted or ?tted into
outward along the core, between the same and
said tube, and (4) the said tube (or part of it) 45 a quartz tube or sleeve 6 (of suitable internal
bore), so that the strips lie between the core and
is collapsed upon the enclosed core and strips,
the tube, the wrapped end of the electrode I being
and even on the foil-enveloped portion of the elec
also inserted or ?tted into the end of the tube.
trode. In this procedure, the order or distinction
The tube or sleeve 6 is collapsed, by heating and
. of steps (1) and (2) is immaterial, and “uniting”
the strips and the electrode wrapping may be un 50 softening it, over the whole distance from the
boundary between the wrapped and unwrapped
derstood to include an original integral union
left unsevered: for example, the foil wrapping
and the strips may be cut out of the same sheet
of metal in one piece and part of this piece
wrapped around the electrode end, leaving the 55
portions of the electrode l to slightly beyond the
junction of strips 3, 3 and leads 4, 4, and is inter
fused and sealed with the core 5 within it.
Assuming the tube or sleeve 6 to be itself the
integral sleeve or neck of a quartz lamp envelope
What I claim as new and desire to secure by
or bulb, the collapsing of this sleeve on the core
Letters Patent of the United States is:
5, etc., as just described would complete the in~
1. In a. seal of the class described, the combina
stallation of the electrode I in the envelope. It
tion of a metallic rod-like electrode and a core
is preferred, however, that the sleeve 6 be a sep 6 member of vitreous material of substantially the
arate tube, so that its collapse, etc., as described
same diameter aligned in abutting end-to-end
merelycompletes a vitreous refractory plug of an
relation,,a metallic, foil conductor including a
electrode assembly including the electrode I, with
portion wrapped around ‘the end of said electrode
the lead strips 3, 3 extending outward through
adjacent said core member and another portion
the seal between the plug sleeve 5 and its core' 5.“
extending therefrom longitudinally of said core
Thereafter the plug with the electrode’! carried
.1 member," and a‘sleeve of ‘vitreous material fused
thereby is inserted into a neck or sleeve portion
around said core member and the portion of said
In of a vitreous refractory lampenvelope ll,,so
v.electrodewhich iswrapped with foil, said foil
that the electrode I is exposed‘ in 'the'envelope,
and the envelope neck l0 is'softened and col-f 15 .;conductor.,being. embedded in the fused seal.
.;2.~In;~a¢seal of, the class described, the combi
lapsed on the plug by heat and interfused with
it, thus sealing the plug into,_the;.ne'ck,.allaasin
nation of a metallic rod~like electrode and a core
member-of vitreous material of substantially the
dicated in Fig. 2.
same ‘diameter aligned in abutting end-to-end
Fig. 4 shows a modi?cation of the foil lead-in
conductor wherein the wrapped portion 2’ and 20 relation, a metallic foil conductor including a
portion wrapped around the end of said electrode
the ribbons or “streamers” 3' (corresponding to
adjacent said core member and .a‘plurality of
the portions 2 and 3 ‘in Fig. 3) are cut out of'the
‘ same sheet of metal in one piece.
ribbon portions'extending therefrom longitudi
nally of said core member, and a sleeve of vitreous
In general, as. a‘ practical ‘matter, :refractory
fused around said core member ,and the
envelope material. similar to quartz includes any 25 material
portion of' said electrode which is wrapped with
highly silicious vitreous material which'has a
‘foil, said foil conductor being embedded in the
coe?icient ‘of expansion of not more‘ substantially
fused seal.
than 1L5>< 10‘6‘per degree centigradeas compared
"with a correspon‘ding‘coe?icient of expansioniof
‘ 055x104‘ per ' degree’ centigrade for-fused quartz 30
'or quartz glass itself.
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