US3582703A - Electric incandescent lamp - Google Patents

Electric incandescent lamp Download PDF

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Publication number
US3582703A
US3582703A US846475A US3582703DA US3582703A US 3582703 A US3582703 A US 3582703A US 846475 A US846475 A US 846475A US 3582703D A US3582703D A US 3582703DA US 3582703 A US3582703 A US 3582703A
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US
United States
Prior art keywords
bulb
boron tribromide
filament
gas
halogen
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
US846475A
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English (en)
Inventor
Tashio Takahashi
Utami Mikami
Shigeru Suzuki
Hideyuki Sato
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Iwasaki Electric Co Ltd
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Iwasaki Electric Co Ltd
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 Iwasaki Electric Co Ltd filed Critical Iwasaki Electric Co Ltd
Application granted granted Critical
Publication of US3582703A publication Critical patent/US3582703A/en
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/50—Selection of substances for gas fillings; Specified pressure thereof

Definitions

  • This invention relates to electric incandescent lamps having a tungsten filament and a bulb made of heat-resistant and pervious material such as quartz glass in which boron tribromide is provided constituting a reactive transport gas for establishing the regenerative cycle in addition to the usual inert gas such as argon and nitrogen.
  • boron tribromide is filled in the amount ranging from 0.8Xl0 to 2.0 l0 gram molecule per 1 cm. of inner volume of the bulb, the bulb life can be considerably extended.
  • This invention generally relates to an electric incandescent lamp comprising a tungsten filament provided in a bulb which is made of heat-resistant or high melting point and pervious material such as quartz glass and filled with a halogen constituting an active transport gas in addition to the usual inert gas, and more particularly to such lamp containing bromine in the form of a bromide compound.
  • the incandescent lamp must be so designed, in case of the reactive transport gas being iodine, that the tungsten filament temperature may be kept at least at a temperature of 800 C. and the bulb wall at 250 C. at the lowest. It will be appreciated that in case of said gas being bromine or chlorine the bulb is to be. sodesigned as to keep said temperatures higher than the above.
  • the Constant Lumen Maintenance Lamp may be manufactured without the difficulties as referred to above when the gas is-filled in thebulb-in theform of hydrogen halide, such as hydrogen iodide, bromide or chloride. It is proposed in the specification of U.S. Pat. No. 3,418,512 issued on Dec. 24, l969to G. R. TJampens et al. to use a halogen as reactive transport gas not only in 'the formof hydrogen halideas referred to in said U.S. Pat. No. 3,091,718 but also in the form of hydrocarbon halide such as hydrocarbon bromide and chloride.
  • An essential feature of this invention is, thus, to provide an incandescent lamp as comprising a tungsten filament provided in a quartz glass bulb which is filled with bromine in the form of boron tribromide constituting a reactive transport gas in addition to the usual inert gas, thereby having no difficulties to be encountered on or during the manufacture ofincandescent lamps of the type as referred to nor structural faults which are inevitable in said type lamps, with maintaining a rather longer life than such conventional incandescent lamps.
  • FIG. 1 is a plan view of an incandescent lamp for projectors or cinematographs
  • FIG. 2 is a similar view of an incandescent lamp for general illuminations.
  • a reference numeral 11 represents a cylindrical bulb made of a quartz glass, 12 a single coil tungsten filament contained in said bulb ll, 13 and 14 legs for supporting said filament l2, l5 and 16 molybdenum foils welding fixed respectivelyto each of said support legs 13 and 14 at the outer ends thereof, 17 and 18 lead conductors connected respectively to each of said molybdenum foils 15 and 16, 19 presssealed portion of the bulb 11.
  • the bulb 11 was made in such a dimension as the outer diameter is 13 mm., and the inner diameter and length are respectively 10 mm. and 15 mm. so as to form 1.5 cm. inner volume of the bulb.
  • the electrical load to the tungsten filament was 24v.l50w.
  • Characteristics of the incandescent lamp as referred to above in which boron tribromide was charged in addition to argon were as in table 1 depending on the amount of the filled boron tribromide ranging from 0.6X10" to 2.5 l0 gram molecule per 1 cm. of the bulb inner volume.
  • the electric load to the tungsten filament 12 was made 24v.-25 0w.
  • the dimension of the bulb l was so selected as '13 mm. outer diameter, 10 mm. inner diameter and 25 mm. length to form 2.5 cm. inner volume.
  • boron tribromide in the amount ranging from 2.0X10" to 5.0 Xl0' gram moleculeper '1 cm inner volume of the bulb in addition to argon gas.
  • the characteristics of the incandescent lamp were varied as shown in table 2 depending on the respective value of the amount of boron tribromide as filled.
  • the invention was applied also to such an incandescent lamp for general illumination as illustrated in FIG. 2 and similarly desirable results were obtained.
  • a reference numeral 21 represents a cylindrical bulb made of quartz glass, 22 coiled tungsten filament, 23 and 24 inner lead conductors connected respectively to each of the opposite ends of the tungsten filament 22, 25 and 26 molybdenum foils weldingly fixed respectively to each of the outer ends of the lead conductors 23 and 24, 27 and 28 outer lead conductors weldingly connected respectively to each of the outer ends of the respective molybdenum foils 25 and 26, and 29 and 30 press-sealed portions of the bulb 21.
  • the electric load to the tungsten filament 22 was made l00v.-500w., and the dimension of the bulb 21 was so selected such that its outer diameter was 13 mm., its inner diameter mm. and its length 44 mm. so as to form 3.2 cm. inner volume of the bulb, in which boron tribromide was charged in the amount ranging from l.0Xl0 to l.5Xl0 gram molecule per 1 cm. inner volume of the bulb in addition to the mixture of argon and nitrogen as inert gas.
  • the characteristics of the incandescent lamp were as in table 3 depending on the value of the charging amount.
  • the average life of the incandescent lamps according to this invention was about 3,000 hours, which is considerably longer than 2,000 hours reported as being of the average life on the conventional incandescent lamps of the similar type.
  • reaction formula l means boron tribromide is decomposed at the higher temperature portion in the bulb adjacent the tungsten filament into bromine and boron to generate molecular bromine necessary for the regenerative cycle.
  • the equation (2) means molecular bromine formed according to the formula (1) is chemically combined with tungsten evaporated from the filament to form tungsten bromide which may be again decomposed at the higher temperature portion in the bulb into tungsten and bromine. Boron as being in the bulb but not taking part in the regenerative cycle is considered to form boron tribromide again at the lower temperature portions in the bulb according to the reaction reverse to that as represented by the formula l so as to maintain equilibrium.
  • An incandescent electric lamp comprising a bulb constituted of heat-resistant and light-transmitting material, a tungsten wire filament mounted in said bulb and having opposite ends, lead conductors sealed and extending through at least one end of said bulb and electrically connected respectively to each of the ends of said filament, said bulb being filled with an inert gas and with a halogen, said halogen constituting a reactive transport gas, said halogen being constituted of boron tribromide, the quantity of said boron tribromide ranging from 0.8Xl0 to 2.0 l0 grarn molecule per 1 cm. of inner volume of the bulb.
  • An incandescent electric lamp as claimed in claim 1 including a pair of metallic foils interconnecting said lead conductors to said ends of said filament respectively.

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  • Discharge Lamp (AREA)
US846475A 1968-08-13 1969-07-31 Electric incandescent lamp Expired - Lifetime US3582703A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP5726068 1968-08-13
JP3872969 1969-05-21

Publications (1)

Publication Number Publication Date
US3582703A true US3582703A (en) 1971-06-01

Family

ID=26378017

Family Applications (1)

Application Number Title Priority Date Filing Date
US846475A Expired - Lifetime US3582703A (en) 1968-08-13 1969-07-31 Electric incandescent lamp

Country Status (7)

Country Link
US (1) US3582703A (enrdf_load_stackoverflow)
BE (1) BE736875A (enrdf_load_stackoverflow)
CH (1) CH512143A (enrdf_load_stackoverflow)
DE (1) DE1938955B2 (enrdf_load_stackoverflow)
FR (1) FR2015570A1 (enrdf_load_stackoverflow)
GB (1) GB1257198A (enrdf_load_stackoverflow)
NL (1) NL142523B (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3843899A (en) * 1972-06-28 1974-10-22 Philips Corp Tungsten-bromine cycle incandescent lamp containing boron
US4024425A (en) * 1974-11-11 1977-05-17 Tokyo Shibaura Electric Co., Ltd. Metal halide lamps
US4238705A (en) * 1979-09-12 1980-12-09 General Electric Company Incandescent lamp seal means
US20030183785A1 (en) * 2000-09-18 2003-10-02 Bar K.O. Kai Radiation source and device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI496974B (zh) * 2011-11-14 2015-08-21 護欄固定結構（三）

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1944825A (en) * 1928-12-18 1934-01-23 Gen Electric Electric incandescent lamp

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1944825A (en) * 1928-12-18 1934-01-23 Gen Electric Electric incandescent lamp

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3843899A (en) * 1972-06-28 1974-10-22 Philips Corp Tungsten-bromine cycle incandescent lamp containing boron
US4024425A (en) * 1974-11-11 1977-05-17 Tokyo Shibaura Electric Co., Ltd. Metal halide lamps
US4238705A (en) * 1979-09-12 1980-12-09 General Electric Company Incandescent lamp seal means
US20030183785A1 (en) * 2000-09-18 2003-10-02 Bar K.O. Kai Radiation source and device
US7820991B2 (en) * 2000-09-18 2010-10-26 Adphos Innovative Technologies Gmbh Radiation source and device

Also Published As

Publication number Publication date
NL142523B (nl) 1974-06-17
NL6911678A (enrdf_load_stackoverflow) 1970-02-17
GB1257198A (enrdf_load_stackoverflow) 1971-12-15
DE1938955A1 (enrdf_load_stackoverflow) 1970-07-09
BE736875A (enrdf_load_stackoverflow) 1969-12-31
DE1938955B2 (de) 1970-07-09
FR2015570A1 (enrdf_load_stackoverflow) 1970-04-30
CH512143A (de) 1971-08-31

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