GB1366163A - High intensity fluorescent lamps - Google Patents

High intensity fluorescent lamps

Info

Publication number
GB1366163A
GB1366163A GB4309771A GB4309771A GB1366163A GB 1366163 A GB1366163 A GB 1366163A GB 4309771 A GB4309771 A GB 4309771A GB 4309771 A GB4309771 A GB 4309771A GB 1366163 A GB1366163 A GB 1366163A
Authority
GB
United Kingdom
Prior art keywords
filling
torr
radiation
amps
cadmium
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
Application number
GB4309771A
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
Publication of GB1366163A publication Critical patent/GB1366163A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/30—Vessels; Containers
    • H01J61/34—Double-wall vessels or containers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/70—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr
    • H01J61/72—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr having a main light-emitting filling of easily vaporisable metal vapour, e.g. mercury

Abstract

1366163 Discharge lamps GENERAL ELECTRIC CO 15 Sept 1971 [15 Oct 1970] 43097/71 Heading H1D A double-walled fluorescent lamp has a metal and rare gas filling which emits far U.V. radiation, mainly at specific resonance lines within the range 1650 to 2300 Šngstrom units, for currents of greater than 1 amp cm.<SP>-2</SP>, and a phosphor coating of calcium tungstate, magnesium silicate, or calcium-magnesium silicate, on the inner surface of the outer envelope, which emits visible or near U.V. radiation in response to the far U.V. radiation. As described, the filling may include mercury, cadmium, or zinc, at a pressure in operation of 10<SP>-3</SP> to 1 torr, and 1 to 20 torr of A, Ne, He, Xe or Kr. The space between the two envelope walls is filled with helium, argon, or nitrogen at 50 to 500 torr, for a mercury discharge filling, or is evacuated for a cadmium or zinc discharge filling. The preferred current density is 4 to 25 amps cm.<SP>-2</SP>, but values up to 100 amps cm.<SP>-2</SP> are referred to. At the higher current densities, a hollow cathode may be employed formed by a pair of semi-cylindrical, concave, conical, or inclined, surfaces, with a thermionic filament therebetween for starting.
GB4309771A 1970-10-15 1971-09-15 High intensity fluorescent lamps Expired GB1366163A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US8090170A 1970-10-15 1970-10-15

Publications (1)

Publication Number Publication Date
GB1366163A true GB1366163A (en) 1974-09-11

Family

ID=22160368

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4309771A Expired GB1366163A (en) 1970-10-15 1971-09-15 High intensity fluorescent lamps

Country Status (5)

Country Link
JP (1) JPS5125660B1 (en)
CA (1) CA938985A (en)
DE (1) DE2150740C3 (en)
FR (1) FR2113016A5 (en)
GB (1) GB1366163A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006046171A1 (en) * 2004-10-26 2006-05-04 Philips Intellectual Property & Standards Gmbh High-pressure gas discharge lamp

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH623957A5 (en) * 1977-10-31 1981-06-30 Bbc Brown Boveri & Cie Device for producing ultraviolet radiation, especially a low-pressure gas-discharge lamp

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006046171A1 (en) * 2004-10-26 2006-05-04 Philips Intellectual Property & Standards Gmbh High-pressure gas discharge lamp

Also Published As

Publication number Publication date
DE2150740A1 (en) 1972-04-20
DE2150740B2 (en) 1974-02-07
CA938985A (en) 1973-12-25
DE2150740C3 (en) 1974-08-29
FR2113016A5 (en) 1972-06-23
JPS5125660B1 (en) 1976-08-02

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees