GB854513A - Improvements in or relating to low pressure mercury vapour electric discharge lamps - Google Patents

Improvements in or relating to low pressure mercury vapour electric discharge lamps

Info

Publication number
GB854513A
GB854513A GB48458A GB48458A GB854513A GB 854513 A GB854513 A GB 854513A GB 48458 A GB48458 A GB 48458A GB 48458 A GB48458 A GB 48458A GB 854513 A GB854513 A GB 854513A
Authority
GB
United Kingdom
Prior art keywords
stem
envelope
lamp
mercury vapour
neon
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
GB48458A
Inventor
Derek Charles Peach
Charles Edington Williams
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 PLC
Original Assignee
General Electric Co PLC
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 PLC filed Critical General Electric Co PLC
Priority to GB48458A priority Critical patent/GB854513A/en
Priority to DEG19206U priority patent/DE1794813U/en
Publication of GB854513A publication Critical patent/GB854513A/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
    • H01J61/70—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

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)

Abstract

854,513. Metal-vapour lamps. GENERAL ELECTRIC CO. Ltd. Jan. 6, 1959 [Jan. 6, 1958], No. 484/58. Class 39(1). A relatively cool region in which mercury vapour can condense whilst the lamp is in operation is provided by means of tubular stem 10 the closed end of which protrudes beyond the closed end of discharge lamp envelope 1, the other end of the stem communicating with the discharge space via aperture 11 in foot-tube 5. A cap 8 is attached to the envelope so as to enclose the protruding stem portion and in the space thus formed a conical 12 or disc-like reflecting member may be provided to reflect heat away from the stem tip. In another form a metallic coating may be provided on the re-entrant envelope portion. In operation the stem tip temperature preferably lies in the range 25-43‹C. and the lamp which has a fluorescent layer 2, contains a neon, or a neon and argon mixture at 2À3 mm of Hg. Heat transfer to the stem tip may also be restricted by providing the envelope with an inwardly extending circumferential groove in the region behind the electrode. The cap may be perforated. The lamp may have stem tubes at each end, one of which may be connected to pumping means. Specifications 835,144, 854,388 and 854,514 are referred to.
GB48458A 1958-01-06 1958-01-06 Improvements in or relating to low pressure mercury vapour electric discharge lamps Expired GB854513A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB48458A GB854513A (en) 1958-01-06 1958-01-06 Improvements in or relating to low pressure mercury vapour electric discharge lamps
DEG19206U DE1794813U (en) 1958-01-06 1959-01-07 ELECTRIC MERCURY - LOW PRESSURE DISCHARGE LAMP.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB48458A GB854513A (en) 1958-01-06 1958-01-06 Improvements in or relating to low pressure mercury vapour electric discharge lamps

Publications (1)

Publication Number Publication Date
GB854513A true GB854513A (en) 1960-11-23

Family

ID=9705153

Family Applications (1)

Application Number Title Priority Date Filing Date
GB48458A Expired GB854513A (en) 1958-01-06 1958-01-06 Improvements in or relating to low pressure mercury vapour electric discharge lamps

Country Status (1)

Country Link
GB (1) GB854513A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1254764B (en) * 1961-07-24 1967-11-23 Ulrich W Doering Fluorescent tube lamp filled with noble gas and an addition of mercury vapor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1254764B (en) * 1961-07-24 1967-11-23 Ulrich W Doering Fluorescent tube lamp filled with noble gas and an addition of mercury vapor

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