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Патент USA US2135661

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Nov. 8, 1938.
Filed Jan. ll, 1937
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Patented Nov. 8, 1938
Wilhelm Hagen, ‘Berlin, and Wolfgang Thouret,
Berlin-Wilmersdorf, Germany, assignors to
General Electric Company, a corporation of New
Application January 11, 1937, Serial No. 120,066
In Germany January 15, 1936
1 Claim.
(01. 176-126)
' The present invention relates to gaseous elec
tric discharge devices generally and more par
ticularly the invention relates to vapor discharge
lamp devices operating with elevated container
5 temperatures and with correspondingly elevated
vapor pressures, such as a vapor pressure in the
order of atmospheres, similar to those disclosed in
co-pending application, Serial No. 104,312, filed
October 6, 1936, the inventors being Marcello
10 Pirani, Robert Rompe and Wolfgang Thouret.
The gaseous electric discharge lamp devices
disclosed in the co-pending application referred to
above comprise a pair of electrodes centrally
mounted in an elongated container and separated
15 a distance less than the diameter of the container.
The current leads supporting the electrodes ex
tend a substantial distance into the container,
and consist of high melting point material such
as tungsten or molybdenum. The container is of
20 small size and consists of a vitreous material,
such as fused silica, capable of withstanding the
high temperatures. Due to the different co
e?icients of expansion of the vitreous material and
the metal it is desirable to use graded seals for
25 such devices.
The object of the present inventionis to pro
vide a gaseous electric discharge lamp device of
the above type which comprises means of simple
structure for protecting the part of the current
30 leads inside the lamp container from the e?ects'
of the gaseous electric discharge. Another ob
Ject of the invention is to provide a gaseous elec
distance into the container and terminates ad
J'acent the electrode mounted on the end of the
current lead.
We have observed that no diminution in the
quantity of vaporizable material available for ' 5
the discharge takes place in a gaseous electri'c.
discharge lamp'device embodying the present in- \
vention even after the device has been operating
for several hundred hours. In many cases this
is of importance,_ for example, when a limited 10
quantity of merc1u~y is introduced into the lamp
during the manufacture thereof in order to vob
tain an unsaturated, vapor pressure when the
lamp is at operating equilibrium. Any loss in the
quantity of vaporizable material in the dis- 15
charge chamber
of a device so constructed
would, of course, change the electrical character
istics of the device, which is undesirable. While
this is apt to be a source of dif?culty in devices
having protruding seals it does not take place in 20
devices embodying the present invention due to
the fact that the electrode is closer to the end of
the insulating sleeve than to the end of the con
tainer and consequently the end of the sleeve is at
a higher temperature during the operation of the 25
device than the end of the container. Any con
densation of mercury vapor therefore takes place
at the end of the container where it is available
for the discharge rather than in the,sleeve where
it is not available for the discharge.
In the drawing accompanying and forming part
of this speci?cation a gaseous electric discharge
lamp device embodying the invention is shown.
in which
Fig, 1 is a side elevational view of a. gaseous elec- 35
tric discharge lamp device of the ‘above type
which is simple in structure and is inexpensive
35 to manufacture. Still further objects and ad—
vantages attaching to the device and to its use tric discharge lamp device, and
and operation will be apparent to those skilled in
Fig. 2 is a sectional view of one end of the
the art from the following particular description. _ lamp shown in Fig‘. 1.
The invention attains its objects by surround
Referring to the drawing the gaseous electric
4() ing the internal part of the current'lead with a discharge lamp device comprises an elongated, 40
tube or sleeve of high heat resisting, insulating tubular, quartz container I having a pair of cur
material, such as quartz, the internal diameter of
which closely approaches the diameter of the
current lead extending therethrough to insure
45 protection of the current lead from the gaseous
electric discharge. ‘The lead protecting sleeve is
part of the stem structure of the lamp which stem
consists of the aforesaid sleeve, a graded joint
fused to the end of and hermetically closing the
50 end of said sleeve and a current lead fused into
said joint and extending through and beyond said
sleeve. In the manufacture of the device the
stem structure is ?rst fabricated and the sleeve
is then fused to the container to make an hermetic
joint therein.
The sleeve extends a substantial
rent leads 4 sealed therein, one at each end
thereof. Said current leads 4 ‘consist of a high
melting point material, such as tungsten. Said
container i has therein a starting gas, such as
argon, and a quantity of vaporizable material,
such as mercury, the vapor of which is luminosity
producing during the operation of the device.
An electrode 5 is mounted on each of said leads Or 0
4. Each of said electrodes 5 consists of a per
forated, tungsten shell ?lled with a mixture of
electron emitting materials, such- as a mixture of
aluminum oxide, tungsten and an alkaline earth
oxide. Said electrodes 5 are heated to an electron
emitting temperature during the operation of the
device by the discharge.
Said container i has a stem at each end thereof
which stem consists of a quartz tube 2, 1, a
graded seal 8, 9, I0, H .fused to the end of said
tube 2, ‘I and to said current lead 4. The part
8 of said seal 8, 9, Ni, ii fused to said lead 4 con
sists of a glass having a coefficient of expan
sion approximating that of the tungsten lead
4 and the part II of said graded seal 8, 9, III, II
consists of a glass having a coefficient of expan
sion approximating that of the quartz tube 2, ‘I.
The intermediate parts 9 and ID of the seal have
coe?icients of expansion intermediate those of
the parts 8 and H. The part ‘I of said tube 2,
1 extends from the endof said container I to a
point adjacent the electrode 5 and has an open
ing 8 therein which is but slightly larger in di
ameter than the current lead 4 extending through
20 said part 1. The part 2 of said tube 2, 1 extends
a short distance beyond the end of the container
I and has an opening 3 therein having the same
diameter as the part 6 of the opening.
In the manufacture of the lamp device de
scribed above the stem consisting of the tube 2,
1, the seal 8, 9, [8, H, the current lead 4 and the
electrode 5 is ?rst fabricated and the end of the
container l is then fused to the'tube 2, l. The
other steps in the manufacture of the lamp de
The advantages of a gaseous electric discharge
lamp device having the above structure have
been pointed out above. It will be understood,
of course, that numerous changes in the form
and details of the device illustrated may be made
within the scope of the appended claim, for
example, the tube 2, ‘I is wholly within the con
tainer I when desired.
What we claim as new and desire to secure
by Letters Patent of the United States is:—
A gaseous electric discharge device comprising
a vitreous container, electrodes and electrode
leads sealed therein, a gaseous atmosphere there
in, said container having a stem comprising an
elongated tube of vitreous material fused thereto,
said tube surrounding one or said current leads
and extending a substantial distance into said
container, the coe?icient of expansion of said
tube being‘ approximately equal to that of said
container and being di?erent than that of said 20
current lead, the inner diameter of said tube
being slightly larger than the diameter of said
current lead, the external end of said tube being
closed by a graded seal fused thereto and to
said current lead, said current lead extending
along said tube and projecting beyond the in
ternal end thereof, one of said electrodes being
mounted on said current lead and adjacent the
inner open end of said tube.
vice, such as the treatment of the electrodes, ex
hausting the container and introducing the start
ing gas and the vaporizable material into the
container; are then carried out.
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