GB822757A - Improvements in or relating to electric incandescent lamp envelopes - Google Patents

Improvements in or relating to electric incandescent lamp envelopes

Info

Publication number
GB822757A
GB822757A GB960/57A GB96057A GB822757A GB 822757 A GB822757 A GB 822757A GB 960/57 A GB960/57 A GB 960/57A GB 96057 A GB96057 A GB 96057A GB 822757 A GB822757 A GB 822757A
Authority
GB
United Kingdom
Prior art keywords
coating
silica
microns
bulk density
light
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
GB960/57A
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.)
Westinghouse Electric International Co
Original Assignee
Westinghouse Electric International 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 Westinghouse Electric International Co filed Critical Westinghouse Electric International Co
Publication of GB822757A publication Critical patent/GB822757A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/52—Means for obtaining or maintaining the desired pressure within the vessel
    • H01K1/54—Means for absorbing or absorbing gas, or for preventing or removing efflorescence, e.g. by gettering
    • H01K1/56—Means for absorbing or absorbing gas, or for preventing or removing efflorescence, e.g. by gettering characterised by the material of the getter
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/28—Envelopes; Vessels
    • H01K1/32—Envelopes; Vessels provided with coatings on the walls; Vessels or coatings thereon characterised by the material thereof

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)

Abstract

822,757. Coating electric lamp bulbs internally. WESTINGHOUSE ELECTRIC INTERNATIONAL CO. Jan. 10, 1957 [Jan. 20, 1956], No. 960/57. Drawings to Specification. Class 39(2) [Also in Group XV] A transparent electric incandescent lamp envelope is provided on its inner surface with a translucent coating of finely divided material which is substantially white in colour and has an average coating thickness of at least 35 microns, a coating bulk density to true material bulk density ratio of from 0.018 to 0.043, and the product of coating thickness in microns and the coating density ratio is at least 0.9. The coating bulk density represents the weight per unit volume of the light-scattering material as coated and, in the case of silica applied electrostatically, the maximum coating bulk density, in grams per cubic centimeter, is 0.094 the silica thus having a fluffy or porous nature since the true material density is 2.2. In order to effect filament coverage with a minimum of light absorption the minimum permissible coating thickness should average 35 microns. In an example, with a coating thickness of 40 microns the coating material density ratio should be at least 0.0225, their product then being 0.9, as aforesaid. Preferably the coating consists of silica applied electrostatically. In order to enhance the light-scattering properties of the silica coating, it should preferably act as a getter for at least 0.4% of moisture, this property being derived as described in Specification 802,910, by baking the finely divided silica, prior to the coating operation, at a temperature of at least 200‹C. and not more than 625‹C. Finely divided light scattering materials other than silica may be electrostatically deposited in carrying out the invention, the coatings being deposited on normally transparent bulbs to the density ratio specified. Zinc oxide, magnesia and alumina most nearly approach silica in performance. In order to increase the adherence of the silica coating at the neck of the lamp, that portion may be steamed to densify it.
GB960/57A 1956-01-20 1957-01-10 Improvements in or relating to electric incandescent lamp envelopes Expired GB822757A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US822757XA 1956-01-20 1956-01-20

Publications (1)

Publication Number Publication Date
GB822757A true GB822757A (en) 1959-10-28

Family

ID=22170171

Family Applications (1)

Application Number Title Priority Date Filing Date
GB960/57A Expired GB822757A (en) 1956-01-20 1957-01-10 Improvements in or relating to electric incandescent lamp envelopes

Country Status (4)

Country Link
DE (1) DE1047938B (en)
FR (1) FR1171461A (en)
GB (1) GB822757A (en)
NL (1) NL213617A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2128805A (en) * 1982-09-28 1984-05-02 Tokyo Shibaura Electric Co Incandescent lamp

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1471925B1 (en) * 1965-05-31 1971-12-16 Owens Illinois Inc DEVICE FOR PATTERNING GLASS OBJECTS
US4081709A (en) * 1975-11-20 1978-03-28 General Electric Company Electrostatic coating of silica powders on incandescent bulbs

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2128805A (en) * 1982-09-28 1984-05-02 Tokyo Shibaura Electric Co Incandescent lamp
US4524410A (en) * 1982-09-28 1985-06-18 Tokyo Shibaura Denki Kabushiki Kaisha Incandescent lamp with film of alternately stacked layers

Also Published As

Publication number Publication date
NL213617A (en)
FR1171461A (en) 1959-01-27
DE1047938B (en) 1958-12-31

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