US2260264A - Method of manufacturing electric discharge vessels - Google Patents

Method of manufacturing electric discharge vessels Download PDF

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Publication number
US2260264A
US2260264A US289213A US28921339A US2260264A US 2260264 A US2260264 A US 2260264A US 289213 A US289213 A US 289213A US 28921339 A US28921339 A US 28921339A US 2260264 A US2260264 A US 2260264A
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US
United States
Prior art keywords
bulb
envelope
cover
electric discharge
discharge vessels
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
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US289213A
Inventor
Scharfnagel Rudolf
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.)
Alcatel Lucent Deutschland AG
C Lorenz AG
Original Assignee
Standard Elektrik Lorenz AG
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 Standard Elektrik Lorenz AG filed Critical Standard Elektrik Lorenz AG
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Publication of US2260264A publication Critical patent/US2260264A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J5/00—Details relating to vessels or to leading-in conductors common to two or more basic types of discharge tubes or lamps
    • H01J5/20—Seals between parts of vessels
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0033—Vacuum connection techniques applicable to discharge tubes and lamps
    • H01J2893/0037—Solid sealing members other than lamp bases

Definitions

  • the invention relates to the manufacture of electric discharge vessels of the kind having an envelope or bulb difficult to soften, that is, a bulb which is of metal or a ceramic material.
  • the invention is especially intended for the manufacture of those discharge tubes which have their electrode system fixed on a ceramic insulating body sealed into. the bulb by means of a binding agent adapted to soften under the influence of heat.
  • the bulb r envelope may at the same time serve as the anode in well known manner.
  • the suction produced by the pump when exhausting the bulb is caused also to aid in sealing the carrier of the electrode. system to the bulb. In this way the interconnection of the two and the exhaustion of the bulb are obtained in a single operation, the pressure of the outer air forcing the softening sealing material into the respective joints.
  • the binding agent 4 is now preliminarily heated while at the same time a cock 6 is opened to connect a pump I to the bulb 5.
  • the suction so produced in bulb 5 acts to force the softening binding agent into the joint between bulb 5 and body I.
  • the pump will quickly exhaust the bulb to such extent that the electrode system and the interior of the bulb will not be subject to oxidation effects.
  • the sealing operation is then finished by raising the temperature.
  • preferably high frequency eddy currents are produced in the metal of the bulb 5 with the aid of a on the body I, this body may be provided with a circumferential ring of glass or the like.
  • a vacuum tube which comprises positioning a porous ceramic cover in the open portion of a tube envelope, covering said porous ceramic cover and a portion of said envelope with a layer of glass, creating a partial vacuum in said envelope and simultaneously heating said layer to seal said cover to said envelope and filling the pores of said cover, completing the exhaustion of said envelope and heating said layer and said envelope to a higher temperature than that of the previous heating to complete the sealing of said cover to said envelope.
  • the method of manufacturing a vacuum tube which comprises positioning a cover in the open portion of a tube envelope, covering at least a portion of said cover and a portion of said envelope with a layer of sealing material, creating a partial vacuum in said envelope and simultaneously heating said layer to seal said cover to said envelope, completing the exhaustion of said envelope and heating said layer and said envelope to a higher temperature than that of the previous heating to complete the sealing of said cover to said envelope.

Description

Oct. 21, 1941. RCSCHARFNAGEL 2,260,264 vME'I'HOD OF MANUFACTURING ELECTRIC DISCHARGE VESSELS Filed Aug 9, 1939 E I Z a i a a 0 Patented Oct. 21, 1941 METHOD OF MANUFACTURING ELECTRIG DISCHARGE VESSELS Rudolf Scharfnagel, Stuttgart, Germany, assignor to C. Lorenz Aktiengesellschaft, Berlin-Tempelhof, Lorenzweg, Germany, a company Application August 9, 1939, Serial No. 289,213 In Germany August 11, 1938 3 Claims.
The invention relates to the manufacture of electric discharge vessels of the kind having an envelope or bulb difficult to soften, that is, a bulb which is of metal or a ceramic material. The invention is especially intended for the manufacture of those discharge tubes which have their electrode system fixed on a ceramic insulating body sealed into. the bulb by means of a binding agent adapted to soften under the influence of heat. The bulb r envelope may at the same time serve as the anode in well known manner.
Under the invention the suction produced by the pump when exhausting the bulb: is caused also to aid in sealing the carrier of the electrode. system to the bulb. In this way the interconnection of the two and the exhaustion of the bulb are obtained in a single operation, the pressure of the outer air forcing the softening sealing material into the respective joints.
temperatures. After the electrode system 3 has been secured to the leads 2 the assembly I, 2, 3 is inserted into the metal bulb 5, body I being calculated to fit into the bulb. The layer of binding agent 4 projects beyond the edge of body I so as to cover the joint between bulb 5 and body I.
With the parts I, 2, 3, 4 in the position represented in the drawing, the binding agent 4 is now preliminarily heated while at the same time a cock 6 is opened to connect a pump I to the bulb 5. The suction so produced in bulb 5 acts to force the softening binding agent into the joint between bulb 5 and body I. As soon as this joint has been sealed in this way to insure vacuum tightness the pump will quickly exhaust the bulb to such extent that the electrode system and the interior of the bulb will not be subject to oxidation effects. The sealing operation is then finished by raising the temperature. To such end, preferably high frequency eddy currents are produced in the metal of the bulb 5 with the aid of a on the body I, this body may be provided with a circumferential ring of glass or the like.
What is claimed is:
I. In the manufacture of electric discharge vessels having a bulb provided with an aperture and a cover for said aperture, the method which comprises covering said aperture with said cover and thereby producing a joint between said cover and said bulb, applying sealing material over said joint, heating said material to a temperature suflicient to soften it and to form a temporary seal and simultaneously exhausting said bulb, exhausting said bulb to substantially its final vacuum, and then raising the heating temperature to complete the seal.
2. The method of manufacturing a vacuum tube which comprises positioning a porous ceramic cover in the open portion of a tube envelope, covering said porous ceramic cover and a portion of said envelope with a layer of glass, creating a partial vacuum in said envelope and simultaneously heating said layer to seal said cover to said envelope and filling the pores of said cover, completing the exhaustion of said envelope and heating said layer and said envelope to a higher temperature than that of the previous heating to complete the sealing of said cover to said envelope.
3. The method of manufacturing a vacuum tube which comprises positioning a cover in the open portion of a tube envelope, covering at least a portion of said cover and a portion of said envelope with a layer of sealing material, creating a partial vacuum in said envelope and simultaneously heating said layer to seal said cover to said envelope, completing the exhaustion of said envelope and heating said layer and said envelope to a higher temperature than that of the previous heating to complete the sealing of said cover to said envelope.
RUDOLF SCI-IARFNAGEL.
US289213A 1938-08-11 1939-08-09 Method of manufacturing electric discharge vessels Expired - Lifetime US2260264A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2260264X 1938-08-11

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US2260264A true US2260264A (en) 1941-10-21

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2490415A (en) * 1947-11-06 1949-12-06 Magic Corset Co Inc Foundation garment
US2641726A (en) * 1950-04-07 1953-06-09 Bell Telephone Labor Inc Electron discharge device and method of fabrication
US3242026A (en) * 1964-07-20 1966-03-22 Ford Motor Co Method of bonding a conducting element to a nonconducting element

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2490415A (en) * 1947-11-06 1949-12-06 Magic Corset Co Inc Foundation garment
US2641726A (en) * 1950-04-07 1953-06-09 Bell Telephone Labor Inc Electron discharge device and method of fabrication
US3242026A (en) * 1964-07-20 1966-03-22 Ford Motor Co Method of bonding a conducting element to a nonconducting element

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