US2042195A - Electric discharge device - Google Patents

Electric discharge device Download PDF

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Publication number
US2042195A
US2042195A US8561A US856135A US2042195A US 2042195 A US2042195 A US 2042195A US 8561 A US8561 A US 8561A US 856135 A US856135 A US 856135A US 2042195 A US2042195 A US 2042195A
Authority
US
United States
Prior art keywords
lamp
mercury
envelope
electric discharge
caps
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
US8561A
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English (en)
Inventor
Scott William Joseph
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 US2042195A publication Critical patent/US2042195A/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
    • H01J61/06—Main electrodes
    • H01J61/073—Main electrodes for high-pressure discharge lamps
    • H01J61/0732—Main electrodes for high-pressure discharge lamps characterised by the construction of the electrode
    • 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
    • H01J61/06—Main electrodes
    • H01J61/073—Main electrodes for high-pressure discharge lamps

Definitions

  • This invention relates to the manufacture of electric discharge devices and more particularly to an improved method 01 making high pressure gaseous or vapour filled lamps.
  • the object of this invention is to produce an improved lamp of the above type which will be simple to construct and which will be robust and inexpensive.
  • Lamps have hitherto been constructed in which a self-heating oxide coated electrode has been used, the electrode being supported on leading-in wires which pass through and are sealed into the glass envelope of the lamp but this sealing-in is a relatively expensive operation and there is difficulty in keeping the ends of the lamp sumciently hot during normal operation of the lamp.
  • I provide a lamp in which the discharge takes place in a high pressure of a mixture of mercury vapour and the vapour or gas of another suitable vaporizable material such as cadmium, the mercury being entirely vaporized but the other material being only partially vaporized.
  • the cadmium or other material which is not evaporated or is condensed collects in cooled pockets at the ends of the lamp and acts as the lamp cathode.
  • an excess of it may be inserted in pockets formed by metal caps fused in the glass at each end of the lamp, the pockets being kept cool by suitable cooling means such as radiating fins.
  • the anode function may be performed either by the metal cap itself or by a projection from it.
  • the glass envelope I is provided with a metal end cap 2 having a pocket or recess 3 containing the cadmium or other material which is to be inserted in the lamp.
  • the metal cap is fused'directly to the glass and the pockets may be kept cool by being provided with radiating fins, such as shown at 4.
  • the anode function may be performed by the cap 2 or by projections from it such as shown at 5 in Fig. 2.
  • the cap 2 is dished so as to protect the seal between the metal and the glass from the heat of the discharge.
  • Fig. 3 I have shown a conical end cap 2 which is provided with an integral shield 6 which while protecting the seal from the heat of the discharge also prevents the glass from being blackened.
  • FIG. 4 is similar to Fig. 1 but in this case an annular metal disc I is sealed into the glass a short distance in front of the cath- 5 ode.
  • This disc acts to prevent sputtering of the cathode and blackening and also may operate as a starting electrode or grid for the discharge.
  • the cathode is constructed in the form of a hollow cylinder and the envelope is drawn 10 down and sealed to its outer side. The inner end of the cylinder projects into the envelope and acts as an anode during the operation of the device.
  • Fig. 6 shows a construction similar to that shown in Fig. 5 except that the cylinder is provided with a flange 8 to which the drawndown end of the envelope is sealed.
  • the lamp may be provided with a vacuum jacket in which case a portion of the pockets may project through the wall of the jacket.
  • a gaseous electric discharge lamp comprising in combination a sealed envelope, a quantity of mercury and another vaporlzable material therein, the quantities of the vaporizable materialsbeing such that during operation of the lamp the mercury can be entirely vaporized and they other material only partially vaporized, means to supply sumcient electrical energy to the lamp to completely vaporize the mercury and a cathode for the lamp consisting of the unevaporated portion of said other vaporizable material.
  • a gaseous electric discharge lamp comprising in combination an envelope, a quantity of mercury and another vaporizable material therein, the quantities of the vaporizable materials being such that during operation of the lamp the mercury can be entirely vaporized and the other material only partially vaporized, means to supply sufficient electrical energy to the lamp to completely vaporize the mercury, caps sealed on the ends of the envelope and recesses in said caps containing the unevaporated portion of the other vaporizable material.
  • a gaseous electric discharge lamp comprising in combination an envelope, a quantity of mercury and another vaporizable material therein, the quantities of the materials being such that during operation of the lamp the mercury can be entirely vaporized and the other material only partially vaporized, means to supply suflicient electrical energy to the lamp to completely vaporize the mercury, caps sealed on the ends of the envelope, recesses in said caps containing the unevaporated portion of the other vaporizable material and heat radiating fins secured to the outer walls of said recesses.
  • a gaseous electric discharge lamp comprising in combination an envelope, a quantity of mercury and another vaporizable material therein, the quantities of the materials being such that during operation of the lamp the mercury can be entirely vaporized and the other material only partially vaporized, means to supply suiiicient electrical energy to the lamp to completely vaporize the mercury, caps sealed on the ends of the envelope, recesses in said caps containing the unevaporated portion of the other vaporizable material and portions projecting from the recesses into the interior of the lamp, said projections acting as anodes.
  • a gaseous electric discharge lamp comprising in combination an envelope, a quantity of mercury and another vaporizable material therein, the quantities of the materials being such that during operation of the lamp the mercury can be entirely vaporized and the other material only partially vaporized, means to supply sumcient electrical energy to the lamp to completely vaporize the mercury, a cathode for the lamp consisting of the unevaporated portion 01' the other vaporizable material, caps secured to the ends of the envelope and recesses in the caps in which the cathodes are situated.
  • a gaseous electric discharge lamp comprising in combination an envelope, a quantity of mercury and another vaporizable material therein, the quantities of the materials being such that during operation of the lamp the mercury can be entirely vaporized and the other material only partially vaporized, means to supply sumcient electrical energy to the lamp to completely 1 vaporize the mercury, a cathode for the lamp consisting of the unevaporated portion of the other vaporizable material, caps secured to the ends of the envelope, recesses in the caps in which the cathodes are situated and metal discs secured to the walls of the envelope in proximity to the cathodes.

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  • Discharge Lamp (AREA)
US8561A 1934-03-05 1935-02-27 Electric discharge device Expired - Lifetime US2042195A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB6967/34A GB434598A (en) 1934-03-05 1934-03-05 Improvements in and relating to electric discharge devices

Publications (1)

Publication Number Publication Date
US2042195A true US2042195A (en) 1936-05-26

Family

ID=9824107

Family Applications (1)

Application Number Title Priority Date Filing Date
US8561A Expired - Lifetime US2042195A (en) 1934-03-05 1935-02-27 Electric discharge device

Country Status (3)

Country Link
US (1) US2042195A (fr)
FR (1) FR786957A (fr)
GB (1) GB434598A (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2659833A (en) * 1949-11-09 1953-11-17 Hanovia Chemical & Mfg Co Ultraviolet vapor electric discharge device
US2732513A (en) * 1952-01-31 1956-01-24 anderson
US2795724A (en) * 1953-04-08 1957-06-11 Gen Electric Electric discharge lamps
US2892113A (en) * 1958-05-12 1959-06-23 Engelhard Ind Inc Electrical discharge lamp
US3405303A (en) * 1964-12-29 1968-10-08 Sylvania Electric Prod Arc discharge tube having an electrode which contains a light-emitting metal
US4092560A (en) * 1974-01-15 1978-05-30 Chemokomplex Vegyipari Gepes Berendezes Export-Import Vallalat Vapor discharge lamp cermet electrode-closure and method of making

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2659833A (en) * 1949-11-09 1953-11-17 Hanovia Chemical & Mfg Co Ultraviolet vapor electric discharge device
US2732513A (en) * 1952-01-31 1956-01-24 anderson
US2795724A (en) * 1953-04-08 1957-06-11 Gen Electric Electric discharge lamps
US2892113A (en) * 1958-05-12 1959-06-23 Engelhard Ind Inc Electrical discharge lamp
US3405303A (en) * 1964-12-29 1968-10-08 Sylvania Electric Prod Arc discharge tube having an electrode which contains a light-emitting metal
US4092560A (en) * 1974-01-15 1978-05-30 Chemokomplex Vegyipari Gepes Berendezes Export-Import Vallalat Vapor discharge lamp cermet electrode-closure and method of making

Also Published As

Publication number Publication date
GB434598A (en) 1935-09-05
FR786957A (fr) 1935-09-14

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