US3809944A - Low-pressure mercury vapour discharge lamp - Google Patents

Low-pressure mercury vapour discharge lamp Download PDF

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Publication number
US3809944A
US3809944A US00283843A US28384372A US3809944A US 3809944 A US3809944 A US 3809944A US 00283843 A US00283843 A US 00283843A US 28384372 A US28384372 A US 28384372A US 3809944 A US3809944 A US 3809944A
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US
United States
Prior art keywords
coating
aperture
pressure mercury
low
mercury vapour
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
US00283843A
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English (en)
Inventor
H Jongerius
Der Wolf R Van
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.)
US Philips Corp
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US Philips Corp
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 US Philips Corp filed Critical US Philips Corp
Application granted granted Critical
Publication of US3809944A publication Critical patent/US3809944A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/54—Igniting arrangements, e.g. promoting ionisation for starting
    • H01J61/545—Igniting arrangements, e.g. promoting ionisation for starting using an auxiliary electrode inside the vessel
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/24—Means for obtaining or maintaining the desired pressure within the vessel
    • H01J61/26—Means for absorbing or adsorbing gas, e.g. by gettering; Means for preventing blackening of the envelope
    • 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
    • H01J61/35—Vessels; Containers provided with coatings on the walls thereof; Selection of materials for the coatings

Definitions

  • the invention relates to a low-pressure mercury vapour discharge lamp having a cylindrical glass envelope which includes means for generating a discharge and whose inner side is coated with a layer of luminescent material.
  • Lamps of the kind described above are known in many embodiments. They are used, inter alia, for general illumination, advertisement purposes and in phototype apparatus. In many cases lamps for phototype apparatus are not coated with the luminescent material over the entire inner circumference of the envelope. A longitudinal aperture in the luminescent coating in lamps of this kind through which a large part of the generated radiation emerges is often provided in order to have a strong directed radiation.
  • the invention relates to the above-described aperture lamps which are particularly used for phototype apparatus.
  • the radiation from the luminescent coating is reflected into the direction of the aperture.
  • This object is achieved, for example, by using a relatively thick luminescent coating or by providing a special reflection coating between the envelope and the luminescent coating.
  • part of the thick luminescent coating serves for generating the radiation and part serves for the reflecting thereof.
  • a separate reflection coating is used, it generally consists of titanium dioxide.
  • the aperture is completely free from luminescent material and from reflecting material possibly present. It has been found that the glass in the aperture which is exposed to the direct influence of the discharge blackens after a given number of operating hours. As a result the radiation is of course inhibited. Particularly when the lamps have a high power in order to generate a strong radiation this blackening occurs quickly and to a strong extent. it has been known to obviate this blackening by coating the glass in the aperture with a transparent layer of aluminium oxide, silicon oxide or titanium dioxide.
  • auxiliary means are required for igniting low-pressure mercury vapour discharge lamps.
  • These auxiliary means may consist of, for example, the provision of internal or external ignition stips made of widely divergent materials which are provided either on the glass or on the luminescent coating.
  • a transparent semiconducting layer for lamps without an aperture between the entire luminescent coating and the glass wall.
  • Such a layer consists preferably of tin oxide which is rendered semiconducting by a given treatment, so-called doping.
  • doping means are phosphorus, antimony, fluorine, oxygen and indium.
  • a further material having semiconducting properties is indium oxide with given doping materials, for example, tin.
  • doping materials for example, tin.
  • Such a material is used for a different purpose in sodium vapour discharge lamps but has not yet been proposed for low-pressure mercury vapour discharge lamps.
  • An object of the invention is to solve at the same time the problem of ignition and the problem ofblackening of the glass in the aperture. This is achieved by coating the glass in the aperture on the inner side with a transparent layer which, measured from end to end, has a resistance of between 5 and 200 kOhm and preferably between 20 and kOhm.
  • conducting tin oxide or conducting in dium oxide is suitable as a material for coating the glass in the aperture.
  • the conducting coating may be connected at one end to an emitter electrode.
  • the conducting coating may be provided in the aperture in different manners.
  • the material of the coating may be sprayed on, it may be provided from a solution or it may be spread out with the aid of a pencil-like pin. This operation may beperformed prior to or after the luminescent coating and the reflection coating possibly present have been provided. It is particularly simple to provide the material when conducting material is not only provided in the aperture but over the entire circumference of the envelope. In fact, the entire envelope may then first be coated on the inner side with the conducting material, whereafter the possible reflection coating and subsequently the luminescent coating may be provided.
  • the reflection coating may first be provided and subsequently the entireinner circumference may be coated with the semiconducting. material, for example, by spraying. The material is then directly located on the glass in the aperture and outside the aperture between the reflection coating and the luminescent coating.
  • FIG. 1 is a perspective view of a lamp according to the invention.
  • FIG. 2 shows an enlarged cross-section through the centre of the lamp. 7
  • FIGS. 3 and' 4 illustrate other embodiments of the lamp in cross-section.
  • 1 denotes the glass envelope of the lamp.
  • a reflection coating 2 consisting of fine-grained Ti0 is provided on the inner side of this glass enve-.
  • a longitudinal aperture 4 is recessed both inthe reflection coating 2 and in the luminescent coating.
  • the glass in the aperture is coated with a transparent coating of conducting tin oxide 5 obtained by spraying on a. mixture of tin chloride, ethyl alcohol and a slight quantity of hydrofluoric acid. This spraying on was effected at a glass envelope temperature .of approximately 600 C in such a manner that the resistance of the coating in the finished lamp measured from end to end was 30 to 50 kOhm.
  • lamps were also made without any coating of the glass in the aperture and lamps with a coating of transparent titanium dioxide on the glass in the aperture.
  • the table below shows that for lamps according to the invention the decline in the luminous flux due to blackening of the aperture is much smaller than for lamps with uncoated glass and is of the same order as for lamps having a coating of titanium dioxide in the aperture.
  • the ignition voltage for lamps according to the invention is, however, much lower than in the two such a part of the circumference that a longitudinal aperture is free from said luminescent material, the glass 7 in the aperture being coated on the inner side with a transparent coating of a material reducing attack and Comparative lamps both lat room temperature and at 5 blackening of the glass, the transparent coating, mea- Apart from the Coating of the aperture the lamps sured from end to end, having a resistance of between were completely identical.
  • the internal diameter was 5 and 200 o 24 mms and the length between the electrodes was 425 2 A ]Ow preSsu1-e mercury vapour discharge lamp mms.
  • Thewldth of the aperture was 7 mms in all lamps. having a Cylindrical glass envelope which includes The l In the measurlhg arrangement was 400 means for generating a discharge and whose inner side The hght meesuremeht was effected h cehlre of a is coated with a coating of luminescent material over m by il a Step s"?
  • a low pressm.e mercury vapour discharge lamp as, gzl gs t ge gl zl sz g't z'i l g ligz fagir g z gliifg zgg zg; claimed in claim 2 wherein the transparent coating in the aperture consists of conducting tin oxide.
  • a low pressure mercury vapour discharge lamp as 3 i g l f ayer' h claimed in claim 2 wherein the transparent coating in l n i l g T ZZ FZZZ A g 40 theaperture consists of conducting indium oxide. IS 8 w 5 e f of the eff/e10 e 6.
  • a low-pressure mercury vapour discharge lamp as ten S 8 en l erenc p claimed in claim 1, wherein the transparent coating exthe portion present outside the aperture being located tends over the entire circumference of the envelope between the reflection coating and the luminescent and en a es the lass at all areas coating.
  • Layer 2 represents the reflective coating and g g g 7.
  • a low-pressure mercury vapour discharge lamp as layer 3 the luminescent coating.
  • a low-pressure mercury vapour discharge lamp tinds f the enme g gl of l ep di having a cylindrical glass envelope which includes a i T g g e f e zg T ocdtet means for generating a discharge and whose inner side 5 e C re CC coa mg e ummescen is coated with a coating of luminescent material over C03

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)
  • Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
US00283843A 1971-08-28 1972-08-25 Low-pressure mercury vapour discharge lamp Expired - Lifetime US3809944A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NLAANVRAGE7111885,A NL169533C (nl) 1971-08-28 1971-08-28 Lagedrukkwikdampontladingslamp.

Publications (1)

Publication Number Publication Date
US3809944A true US3809944A (en) 1974-05-07

Family

ID=19813905

Family Applications (1)

Application Number Title Priority Date Filing Date
US00283843A Expired - Lifetime US3809944A (en) 1971-08-28 1972-08-25 Low-pressure mercury vapour discharge lamp

Country Status (8)

Country Link
US (1) US3809944A (OSRAM)
JP (2) JPS4835680A (OSRAM)
BE (1) BE788095A (OSRAM)
CA (1) CA958753A (OSRAM)
DE (1) DE2238927A1 (OSRAM)
FR (1) FR2150908B1 (OSRAM)
GB (1) GB1339099A (OSRAM)
NL (1) NL169533C (OSRAM)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3963954A (en) * 1974-11-25 1976-06-15 Gte Sylvania Incorporated Fluorescent lamp having indium oxide conductive coating and a protective coating therefor
US3967153A (en) * 1974-11-25 1976-06-29 Gte Sylvania Incorporated Fluorescent lamp having electrically conductive coating and a protective coating therefor
DE2644821A1 (de) * 1975-10-06 1977-04-14 Gte Sylvania Inc Leuchtstofflampe mit reflektorschicht
US4064291A (en) * 1975-11-04 1977-12-20 U.S. Philips Corporation Spray-coating method of window forming in tubular lamp
US4070570A (en) * 1976-06-29 1978-01-24 General Energy Development Corporation Lighting apparatus
FR2371775A1 (fr) * 1976-11-19 1978-06-16 Philips Nv Lampe a decharge dans la vapeur de mercure a basse pression
US4265950A (en) * 1979-11-27 1981-05-05 Westinghouse Electric Corp. Phosphor-coating composition and method for electric discharge lamp
US4661890A (en) * 1985-03-29 1987-04-28 Kabushiki Kaisha Toshiba Lamp unit
US5801482A (en) * 1994-08-25 1998-09-01 U.S. Phillips Corporation Low-pressure mercury vapor discharge lamp
US20030025451A1 (en) * 2001-07-31 2003-02-06 Fujitsu Limited Gas discharge tube and method for forming electron emission layer in gas discharge tube
WO2002037533A3 (en) * 2000-10-31 2003-12-31 Gen Electric Novel materials and methods for application of conducting members on arc tubes
US20040033319A1 (en) * 2002-08-19 2004-02-19 Fujitsu Limited Method for forming metal oxide film and method for forming secondary electron emission film in gas discharge tube
US20070138960A1 (en) * 2005-12-16 2007-06-21 General Electric Company Fluorescent lamp with conductive coating
CN100419945C (zh) * 2002-04-08 2008-09-17 通用电气公司 荧光灯

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2472833A1 (fr) * 1979-12-27 1981-07-03 Cit Alcatel Source d'eclairage pour analyse ligne par ligne d'un document
DE10058852A1 (de) * 2000-11-27 2002-06-06 Raylux Gmbh Kompakte elektrodenlose Niederdruck-Gasentladungslampe mit erhöhter Lebensdauer

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3067356A (en) * 1960-04-06 1962-12-04 Sylvania Electric Prod Fluorescent lamp

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3067356A (en) * 1960-04-06 1962-12-04 Sylvania Electric Prod Fluorescent lamp

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3963954A (en) * 1974-11-25 1976-06-15 Gte Sylvania Incorporated Fluorescent lamp having indium oxide conductive coating and a protective coating therefor
US3967153A (en) * 1974-11-25 1976-06-29 Gte Sylvania Incorporated Fluorescent lamp having electrically conductive coating and a protective coating therefor
DE2644821A1 (de) * 1975-10-06 1977-04-14 Gte Sylvania Inc Leuchtstofflampe mit reflektorschicht
US4064291A (en) * 1975-11-04 1977-12-20 U.S. Philips Corporation Spray-coating method of window forming in tubular lamp
US4070570A (en) * 1976-06-29 1978-01-24 General Energy Development Corporation Lighting apparatus
FR2371775A1 (fr) * 1976-11-19 1978-06-16 Philips Nv Lampe a decharge dans la vapeur de mercure a basse pression
US4265950A (en) * 1979-11-27 1981-05-05 Westinghouse Electric Corp. Phosphor-coating composition and method for electric discharge lamp
US4661890A (en) * 1985-03-29 1987-04-28 Kabushiki Kaisha Toshiba Lamp unit
US5801482A (en) * 1994-08-25 1998-09-01 U.S. Phillips Corporation Low-pressure mercury vapor discharge lamp
WO2002037533A3 (en) * 2000-10-31 2003-12-31 Gen Electric Novel materials and methods for application of conducting members on arc tubes
US20030025451A1 (en) * 2001-07-31 2003-02-06 Fujitsu Limited Gas discharge tube and method for forming electron emission layer in gas discharge tube
US6932664B2 (en) * 2001-07-31 2005-08-23 Fujitsu Limited Gas discharge tube and method for forming electron emission layer in gas discharge tube
CN100419945C (zh) * 2002-04-08 2008-09-17 通用电气公司 荧光灯
US20040033319A1 (en) * 2002-08-19 2004-02-19 Fujitsu Limited Method for forming metal oxide film and method for forming secondary electron emission film in gas discharge tube
US7208203B2 (en) * 2002-08-19 2007-04-24 Fujitsu Limited Method for forming metal oxide film and method for forming secondary electron emission film in gas discharge tube
US20070138960A1 (en) * 2005-12-16 2007-06-21 General Electric Company Fluorescent lamp with conductive coating
US7378797B2 (en) 2005-12-16 2008-05-27 General Electric Company Fluorescent lamp with conductive coating

Also Published As

Publication number Publication date
FR2150908A1 (OSRAM) 1973-04-13
BE788095A (fr) 1973-02-28
DE2238927A1 (de) 1973-03-01
FR2150908B1 (OSRAM) 1976-08-13
JPS4835680A (OSRAM) 1973-05-25
JPS5472385U (OSRAM) 1979-05-23
NL169533C (nl) 1982-07-16
NL7111885A (OSRAM) 1973-03-02
GB1339099A (en) 1973-11-28
CA958753A (en) 1974-12-03
NL169533B (nl) 1982-02-16

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