US2001516A - Gaseous electric discharge device - Google Patents

Gaseous electric discharge device Download PDF

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Publication number
US2001516A
US2001516A US671318A US67131833A US2001516A US 2001516 A US2001516 A US 2001516A US 671318 A US671318 A US 671318A US 67131833 A US67131833 A US 67131833A US 2001516 A US2001516 A US 2001516A
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US
United States
Prior art keywords
container
stem
electrodes
tube
gaseous
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US671318A
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English (en)
Inventor
Bol Cornelis
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric Co
Original Assignee
General Electric Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by General Electric Co filed Critical General Electric Co
Application granted granted Critical
Publication of US2001516A publication Critical patent/US2001516A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/04—Electrodes; Screens; Shields

Definitions

  • the present invention relates to gaseous electainer. It is preferable that the greater part of tric discharge devices generally and more parthe length of said passage be located in the cooler ticularly the invention relates to improvements in stem parts of said container.
  • Fig. l is a side elevational partly sectional view alkali metal, such as sodium, is used as the of an electric discharge device embodying one 25 source of the condensable vapor in such a device form of the present invention, and it is practical to make the parts of said container
  • Fig. 2 is a detail sectional view of the stem part surrounding the discharge path of a glass resistof a gaseous electric discharge device embodying ant to the chemical effects of the metal vapor and another form of the invention.
  • the object of the difierent glass than said container I and of a present invention is to provide a gaseous elecglass having better sealing characteristics than tric discharge device the gaseous atmosphere of said resistant glass.
  • Said electrode 4 is the cathwhich consists wholly or in part of condensable ode, said cathode 4 consists of a metal filament, metal vapor in which evacuation of all parts of such as a tungsten filament, coated with an electhe container of the device is easily accomplished tron emitting ma u as barium Oxide, and during the manufacture of the device and in is electron emitting when heated.
  • Said electrodes which the stem parts of said container are closed 5 are plate shaped anodes and are arranged on off from the other parts of said container during either side of said cathode 4.
  • the part of said the operation of the device.
  • container I surrounding said electrodes 4 and 5 and advantages attaching to the device and to has a gaseous filling therein comprising a conits use and operation will be apparent to those densable gas, such as a mixture of neon at ap- 5 skilled in the art from the following particular proxima y 1 m Pressure d d or a description and from the appended claims. mixture of argon and sodium.
  • the sodium which The above object is attained by providing a is solid at room temperature and from which the long, narrow communicating passage connecting sodium vapor is generated by the heat of the disthe part of said container surrounding the discharge between said electrodes 4 and 5 during the charge path and the stem parts of said conoperation of the device is located in that part of said container surrounding the discharge path between said electrodes 4 and 5.
  • the septum 6 closes off the cooler stem parts 3 of the container I from the part of said container I surrounding the discharge path between said electrodes 4 and 5.
  • Said septum 6 consists of a heat insulation material resistant to the chemical effects of the gaseous filling, such as mica, glass, or the like and is a circular disc the diameter thereof corresponding to or closely approaching that of the inner walls of that part of container I surrounding said stem 3.
  • the current inleads for said electrodes 4 and 5 pass through said disc 6.
  • Said disc 6 rests on top of the pinch part 2 of said stem 3 and is forced against the lower part of a circular indentation I in the walls of said container I.
  • the space, if any, between the rim of said disc 5 and the inner wall of said container I is sealed by a body 3 of suitable sealing material, such as a mixture of talcum and water glass.
  • the tube 9 made of insulation material, such as magnesium oxide, is provided to connect the spaces on both sides of said container I.
  • the greater part of the length of said tube 9 is located in the space about said stem part 3 and part of the outer wall of said tube 9 is contiguous to the wall of said stem 3.
  • the part of said septum Ii through which said tube 9 passes fits tightly around said tube 9 and a suitable soldering material, such as a mixture of talcum'in water glass, is used to hold said tube 9 against the wall of said stem 3. The tube 9 is thus held rigidly in position in said container I.
  • the diameter of the passage in said tube 9 is approximately the same as the length of the mean free path of an ionized gas particle and said tube 9 is of the nature of a capillary tube.
  • the length of tube 9 is optional depending on the type of container it is advantageous but not essential that the tube 9 have a length of at least 5 times the diameter of the passage therein and a greater length is advisable in many instances. I prefer a tube of 1 sq. mm. cross section and 2 cm. in length.
  • the spaces above and below the septum 6 can be evacuated through a single exhaust tip communicating with either one of said spaces which simplifies the manufacture of the device.
  • the device is started into operation by heating the cathode 4 to an electron emitting temperature. Voltage is then applied across the terminals of said electrodes 4 and 5 to start the discharge between said electrodes 4 and 5. At first this discharge is conducted between said electrodes 4 and 5 by the neon. The heat of the discharge vaporizes the sodium, which is solid at room temperature, and the light emitted by the device is rich in rays characteristic of the sodium vapor. The flow of sodium vapor through the passage in said tube 9 during the-operation of the device is reduced to a minimum due to the small diameter and long length of said passage. Part, or all of the metal vapor that does pass through said tube 9 condenses on the cooler lower wall thereof contiguous and adjacent to the stem 3.
  • FIG. 2 of the drawing Another embodiment of the invention is illustrated in Fig. 2 of the drawing.
  • This embodi- 10 ment is similar in all respects to the embodiment illustrated in Fig. 1 except that the septumlis a metal disc III made of nickel or chrome-steel, for example.
  • Said disc I0 is slightly dished so that it is somewhatilexible to allow for the expansion and contraction of the walls of the container into which the rim parts of said disc are fused.
  • a layer II of glass resistant to the chemical effects of the metal vapor in the part of the container surrounding the discharge path in the device is applied to the surface of said disc I0 facing the gaseous electric discharge path in the device to protect said disc I9 from the chemical effects of said metal vapor.
  • insulating tubes I2 and I3 made of magnesium oxide, for example.
  • Said tubes I2 and I3 are attached to said disc ID by flowing the glass of layer II into the openings between the sides of said tubes I2 and I3 and the sides of the openings in said disc I3 which also closes said openings in said disc III.
  • the electrode inleads I4 are sealed into an inverted stem I 5 and are led through said tubes I2 and I3.
  • Said tubes I2 fit tightly around the electrode inleads I4 therein. A slight play is present between the inner wall of the tube I3 and the inlead I4 in said tube I3.
  • the lower end of said tube I3 terminates a distance fromthe stem I5 while the lower ends of said tubes I2 are fused into said stem I5.
  • the passage in said tube I3 connects the spaces above and below the disc III so that both spaces are exhausted through a single exhaust tip during the manufacture of the device.
  • the passage I 3 is closed by deposits of condensed material therein as the lower part of said tube I3 is colder than the upper part thereof during the operation of the device. A complete separation of the space above and be 5 low the disc III is thus effected with the operating advantages heretofore pointed out.
  • An electric discharge device comprising a,
  • An electric discharge device comprising a container, electrodes sealed therein, a gaseous filling therein comprising a condensable gas, a stem fused to said container, a septum between the part of said container surrounding the discharge path between said electrodes and the stem part of said container, and a capilliary tube through said septum.
  • An electric discharge device comprising a container, electrodes sealed therein, a gaseous filling therein comprising a condensable gas, a stem fused to said container, a septum between the part of said container surrounding the discharge path between said electrodes and the stem part of said container, and a capillary tube through said septum, the greater part of said capillary tube being in the stem part of said container.
  • An electric discharge device comprising a container, electrodes sealed therein, a gaseous filling therein comprising a condensable gas, a stem fused to said container, a septum between the 'part of said container surrounding the discharge path between said electrodes and the stem part of said container, and a capillary tube through said septum, the greater part of said capillary tube being in the stem part of said container and contiguous to said stem.
  • An electric discharge device comprising a container, electrodes sealed therein, a gaseous filling therein comprising a condensable gas, a stem fused to said container, a septum between the part of said container surrounding the discharge path between said electrodes and the stem part of said container, said container and said septum being of a material resistant to the chemical effects of said gaseous filling, said stem being of a different material and a capillary tube through said septum.
  • An electric discharge device comprising a container, electrodes and electrode leads sealed therein, a gaseous atmosphere therein, a stem and having an inside diameter larger than the diameter of said lead.
  • An electric discharge device comprising a container, electrodes sealed therein, a gaseous atmosphere therein, a stem fused to said container, a septum between the part of said container surrounding the discharge path between said electrodes and the stem part of said container, a vaporizable material in the part of said container surrounding the discharge path between said electrodes and a communicating passage between the stem part of said container and the part thereof surrounding the discharge path, the cross-section of said passage being such that deposits of condensed metal vapor close said passage during the operation of the device.

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Glass Compositions (AREA)
  • Secondary Cells (AREA)
US671318A 1933-01-17 1933-05-16 Gaseous electric discharge device Expired - Lifetime US2001516A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEN34758D DE597745C (de) 1933-01-17 1933-01-17 Elektrische Entladungsroehre mit Metalldampffuellung, insbesondere zum Aussenden von Lichtstrahlen

Publications (1)

Publication Number Publication Date
US2001516A true US2001516A (en) 1935-05-14

Family

ID=7346844

Family Applications (2)

Application Number Title Priority Date Filing Date
US671318A Expired - Lifetime US2001516A (en) 1933-01-17 1933-05-16 Gaseous electric discharge device
US705441A Expired - Lifetime US1961897A (en) 1933-01-17 1934-01-05 Gaseous electric discharge device

Family Applications After (1)

Application Number Title Priority Date Filing Date
US705441A Expired - Lifetime US1961897A (en) 1933-01-17 1934-01-05 Gaseous electric discharge device

Country Status (5)

Country Link
US (2) US2001516A (enrdf_load_stackoverflow)
DE (2) DE594634C (enrdf_load_stackoverflow)
FR (1) FR757631A (enrdf_load_stackoverflow)
GB (2) GB425103A (enrdf_load_stackoverflow)
NL (1) NL40362C (enrdf_load_stackoverflow)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2881345A (en) * 1953-02-03 1959-04-07 Claude General Neon Lights Ltd Low pressure mercury vapour electric discharge lamps
JPS56160753A (en) * 1980-05-14 1981-12-10 Matsushita Electronics Corp Fluorescent bulb and manufacturing method

Also Published As

Publication number Publication date
US1961897A (en) 1934-06-05
DE597745C (de) 1934-05-30
GB425103A (en) 1935-03-07
FR757631A (fr) 1933-12-29
NL40362C (enrdf_load_stackoverflow)
DE594634C (de) 1934-03-19
GB425601A (en) 1935-03-19

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