US3780329A - 40 watt fluorescent lamp - Google Patents

40 watt fluorescent lamp Download PDF

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Publication number
US3780329A
US3780329A US00304418A US3780329DA US3780329A US 3780329 A US3780329 A US 3780329A US 00304418 A US00304418 A US 00304418A US 3780329D A US3780329D A US 3780329DA US 3780329 A US3780329 A US 3780329A
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United States
Prior art keywords
tube
length
fluorescent
electrode
rare gas
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
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US00304418A
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English (en)
Inventor
M Hommo
H Otsuka
K Nohmi
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Panasonic Holdings Corp
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Matsushita Electronics Corp
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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
    • H01J61/12—Selection of substances for gas fillings; Specified operating pressure or temperature
    • H01J61/18—Selection of substances for gas fillings; Specified operating pressure or temperature having a metallic vapour as the principal constituent
    • H01J61/20—Selection of substances for gas fillings; Specified operating pressure or temperature having a metallic vapour as the principal constituent mercury vapour
    • 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

Definitions

  • ABSTRACT Luminous flux and luminous efficiency of a 40 watt fluorescent lamp comprising a ballast specified by the 1.E.C. Publication 82 is greatly improved by employing an improved tube characterized by:
  • the rare gas having the nominal tube length of 1,200 mm and the inner diameter of mm to mm, provided inside at each end of the tube with an electrode E having the length l of 15 mm to mm inward from the end face of each cap C as measured as shown in FIG. 2,) and containing mixed rare gas inside the tube, the rare gas having composition ratio represented by any point within a diagonal region defined by connecting the following points (a) to (e) and (a) with straight lines in the following order, on a trilinear chart for xenon, krypton and argon mixture:
  • This invention relates to a 40 watt fluorescent lamp, and especially to an improvement in a 40 watt fluorescent tube and its purpose is to provide improved lumi obviously flux and efficiency of the tube and reduction in the cost, as compared with conventional 40 watt fluorescent tubes.
  • the 40 watt fluorescent tubes of the prior art are manufactured in accordance with the dimensions of the I.E.C. (International Electrotechnical Commision) lb ss i (fa T bula flusr s m l p r 2w eral lighting service), namely, with a nominal tube length of 1,200 mm and an outer diameter of 38 mm, containing inside about 2 to 3 mmHg of argon gas and some quantity of mercury, fitted with an electrode at each inner end, and sealed with a metal cap at each outer end.
  • I.E.C. International Electrotechnical Commision
  • lb ss i fa T bula flusr s m l p r 2w eral lighting service
  • the lamp comprises a ballast B, a glow starter G and a 40 watt fluorescent tube T.
  • a choke coil type ballast as specified by the I.E.C. Publication 82 (covering Ballasts for fluorescent lamps) is employed.
  • ballast is hereinafter referred to as conventional ballast or ballast in current use.
  • the inventors of the present invention made thorough investigations for improving the luminous flux and efficiency of the fluorescent lamp by using said 40 watt fluorescent fltting-and-ballast and for reducing the cost of tube. Consequently, the inventors found that a fluorescent tube with a specified inner diameter of bulb, electrodes with specified length and enclosed gas of a specified composition ratio, showed good performance.
  • FIG. 1 is a diagram showing a general construction of a lamp with a 40 watt fluorescent tube, of the prior art as well as of the present invention.
  • FIG. 2 is a partially cut away side view of a 40 watt fluorescent tube of the present invention.
  • FIG. 3 is trilinear chart showing the composition of mixed gas enclosed in the fluorescent tube.
  • each end of the tube with an electrode E having a length l of 15 mm to 55 mm inward from the end face of each cap C as measured as shown in FIG. 2,
  • the rare gas having a composition ratio represented by any point within a diagonal region defined by con necting the following points (a) to (e) and (a) with straight lines in the following order, on a trilinear chart for xenon, krypton and argon mixture:
  • the pressure of the mixed gas being between 1.0 mmHg and 3.5 mmHg at the temperature of 20C.
  • FIG. 3 shows the trilinear chart indicating the diagonal regions.
  • a luminous flux of between 3,250 lm (lumens) and 3,400 lm is obtainable, in comparison with that of 3,200 lm obtainable with the conventional 40 watt fluorescent tube, that is, an increase of 1.6% to 6.3% in the luminous flux quantity.
  • the electric powerconsumption of this new fluorescent tube is 36.5 watts to 38 watts, which is 5% to 9% less than the power consumption of 40 watts of the conventional 40 watt fluorescent tube.
  • the lamp efficiency of the fluorescent tube of the present invention becomes 85.5 lm/w to 93.2 lm/w, as compared with lm/w of the conventional 40 watt tube, that is, an increase of 6.9% to 16.4% in the lamp efficiency.
  • the inner diameter that affords distinctly superior luminous flux as compared with the conventional 40 watt fluorescent tubes is one smaller than 25 mm. Nevertheless, when the inner diameter becomes smaller that 20 mm, starting of the lamp with the conventional 40 watt fluorescent fitting-and-ballast be comes difficult.
  • the electrode length 1 namely, the length from the tube end to the inward edge of the electrode as shown in FIG. 2, is one of the important factors affecting the performance, so much so that the fluorescent tube of this invention characterized by the abovementioned combinations of the inner diameter, kinds of the enclosed gases and the pressure can function with the conventional 40 watt fluorescent fitting-and-ballast only when provided with a pair of electrodes conforming to the dimensional range of length l.
  • the fluorescent tube according to this invention having the nominal tube length of 1,200 mm combined with the inner diameter, as well as the enclosed rare gas compositions and pressure, all selected within the above-described ranges, was mounted in the conventional 40 watt fluroescent fitting-and-ballastand lit, and many experiments were made with various electrodes of different length l, and consequently, the following result was obtained. Namely, the lamp starting becomes easier with longer electrode length I. Also the difference of the electrode length l affects the luminous flux, which becomes largest with the electrode length [of 25 mm, but if the length l exceeds 55 mm, the luminous flux falls to the same level with, or even lower than, that of the conventional fluorescent tube.
  • Example 1 A fluorescent tube having a length of 1,198 mm measured from one base face to another base face, an inner diameter of 22.5 mm, an electrode length l of 40 mm (i.e., the length of each tube end inward to each electrode coil inside the tube as shown in FIG. 2), containing inside rare gas at 2.1 mmHg (at 20C) which is a mixture of xenon, krypton and argon gases in the volume ratios of 3%, 52% and 45%, respectively, and some quantity of mercury, and coated on the inner wall with 6.0 g/cm' of antimony-manganese-activated calcium halophosphate phosphor, was applied to a conventional 40 watt fluorescent fitting-and-ballast to constitute a lamp.
  • inside rare gas at 2.1 mmHg at 20C
  • 6.0 g/cm' of antimony-manganese-activated calcium halophosphate phosphor was applied to a conventional 40 watt fluorescent fitting-and-ballast to constitute
  • This lamp when lit, had a lamp luminous flux of 3,350 lm, an electric consumption of 37.0 watts, a lamp current of 415 milliampere and a lamp voltage of l volts, resulting in a lamp efficiency of 90.5 lm/w.
  • Example 2 A fluorescent tube having a tube length of 1 ,198 mm, measured between base faces, a inner diameter of 22.5 mm and an electrode length lof 37 mm, containing inside rare gas at 2.4 mmHg (at C) which is a mixture of xenon and argon gases in volume ratios of 7% and 93%, respectively, and some quantity of mercury, and coated on the inner wall with 6.1 g/cm of antimonymanganese-activated calcium halophosphate phosphor, was applied to a conventional 40 watt fluorescent fitting-and-ballast to constitute a lamp.
  • inside rare gas at 2.4 mmHg (at C) which is a mixture of xenon and argon gases in volume ratios of 7% and 93%, respectively, and some quantity of mercury
  • This lamp when lit, had a luminous flux of 3,340 lm, an electric consumption of 37.3 watts, a lamp current of418 milliampere, a lamp voltage of l 12 volts, resulting in a lamp efficiency of 89.5 lm/w and proving to be a distinct improvement over the conventional 40 watt fluorescent Example 3
  • a fluorescent tube having a tube length of 1,198 mm, measured between base faces, an inner diameter of 22.5 mm, an electrode length l of 32 mm, containing inside rare gas at 1.8 mmHg (at 20C) which is a mixture of krypton and argon gases in volume ratios of 61% and 39%, respectively, and some quantity of mercury, and coated on the inner wall with 6.2 g/cm of antimony'manganese-activated calcium halophosphate phospher, was applied to a conventional 40 watt fluorescent fitting-and -ballast to constitute a lamp.
  • the above lamp when lit, had a luminous flux of 3,360 lm, electric consumption of 37.8 watts, a lamp current of 405 milliampere and a lamp voltage of 115 volts, resulting in a lampefficiency of 88.9 lm/w and proving to be a distinct improvement over the conventional 40 smith p effisisnsx
  • the 40 watt fluorescent tube according to the present invention attains distinct improvements in the lamp luminous flux and efficiency. Furthermore, whereas the durability of this new fluorescent tube is just as good as that of the conventional fluorescent tubes, its economical advantages are incomparable due to its reduced diametral size, resulting in a saving in the costs of raw material, packing, transportation, storing, and so forth.
  • the fluorescent tube of the present invention when combined with the conventional 40 watt fluorescent fitting-and-ballast, embodies many advantages through the improvements in the luminous flux and efficiency, as well as a reduction in cost, and thereby offers a great industrial contribution. Therefore, the inventors hereof make the following claims for patent.
  • a fluorescent lamp comprising a fitting and a ballast for a standard 40 watt fluorescent tube, and
  • a fluorescent tube comprising: a tubular glass bulb,
  • said glass bulb having an inner diameter of between 20 and 25 mm
  • each electrode having a length of between l5 and 55 mm as measured from the end face of the cap to a coil of the electrode
  • the enclosed mixed rare gas having a compositionv .ratio represented by any point within a diagonal region defined by connecting the following points (a), (b), (c), (d), (e), and (a) with straight lines in this order, on a trilinearr chart for xenon, krypton and argon mixture:
  • rescent layer one cap with connecting pins on each end of said bulb, the tube having a length of approximately 1,200 mm, one electrode on each end of the glass bulb, enclosed mixed rare gas and mercury inside the bulb,
  • said glass bulb having an inner diameter of between 20 and 25 mm
  • each electrode having a length of between 15 and 55 mm as measured from the end face of the cap to a coil of the electrode
  • the enclosed mixed rare gas having a composition ratio represented by any point within a diagonal region defined by connecting the following points (a), (b), (c), (d), (e), and (a) with straight lines in this order on a trilinear chart for xenon, krypton and argon mixture:
  • the pressure of the mixed gas being between 1.0 mmHg and 3.5 mmHg at a temperature of 20C.

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  • Discharge Lamp (AREA)
US00304418A 1971-11-12 1972-11-07 40 watt fluorescent lamp Expired - Lifetime US3780329A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1971106232U JPS4861678U (de) 1971-11-12 1971-11-12

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4335330A (en) * 1976-11-02 1982-06-15 U.S. Philips Corporation Low-pressure mercury vapor discharge lamp
US4422010A (en) * 1981-04-13 1983-12-20 General Electric Company Shaped discharge lamp with starting aid
US4689521A (en) * 1985-05-23 1987-08-25 Lumalampan Aktiebolag Compact low pressure mercury vapor discharge lamp
WO2002037534A2 (en) * 2000-10-30 2002-05-10 General Electric Company Low wattage fluorescent lamp
US6400097B1 (en) 2001-10-18 2002-06-04 General Electric Company Low wattage fluorescent lamp
WO2003032364A1 (en) * 2001-10-04 2003-04-17 Koninklijke Philips Electronics N.V. Low-pressure mercury discharge lamp
US6683407B2 (en) 2001-07-02 2004-01-27 General Electric Company Long life fluorescent lamp
WO2004095503A2 (en) * 2003-04-22 2004-11-04 Koninklijke Philips Electronics N.V. Assembly of a fluorescent lamp and an extension means
US20080278073A1 (en) * 2007-05-09 2008-11-13 General Electric Company Low wattage fluorescent lamp

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2714682A (en) * 1952-06-27 1955-08-02 Westinghouse Electric Corp Low pressure fluorescent and discharge lamps
US2714685A (en) * 1951-08-25 1955-08-02 Westinghouse Electric Corp Low pressure fluorescent and discharge lamps
US2976448A (en) * 1959-02-26 1961-03-21 Egyesuelt Izzolampa Fluorescent lamp

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2714685A (en) * 1951-08-25 1955-08-02 Westinghouse Electric Corp Low pressure fluorescent and discharge lamps
US2714682A (en) * 1952-06-27 1955-08-02 Westinghouse Electric Corp Low pressure fluorescent and discharge lamps
US2976448A (en) * 1959-02-26 1961-03-21 Egyesuelt Izzolampa Fluorescent lamp

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4335330A (en) * 1976-11-02 1982-06-15 U.S. Philips Corporation Low-pressure mercury vapor discharge lamp
US4422010A (en) * 1981-04-13 1983-12-20 General Electric Company Shaped discharge lamp with starting aid
US4689521A (en) * 1985-05-23 1987-08-25 Lumalampan Aktiebolag Compact low pressure mercury vapor discharge lamp
US6583566B1 (en) 2000-10-27 2003-06-24 General Electric Company Low wattage fluorescent lamp having improved phosphor layer
WO2002037534A2 (en) * 2000-10-30 2002-05-10 General Electric Company Low wattage fluorescent lamp
WO2002037534A3 (en) * 2000-10-30 2002-09-06 Gen Electric Low wattage fluorescent lamp
US6683407B2 (en) 2001-07-02 2004-01-27 General Electric Company Long life fluorescent lamp
US20030085655A1 (en) * 2001-10-04 2003-05-08 Van Der Pol Adrianus Johannes Hendricus Petrus Low-pressure mercury discharge lamp
WO2003032364A1 (en) * 2001-10-04 2003-04-17 Koninklijke Philips Electronics N.V. Low-pressure mercury discharge lamp
EP1304721A1 (de) * 2001-10-18 2003-04-23 General Electric Company Fluoreszenzlampe niedriger Leistung
US6400097B1 (en) 2001-10-18 2002-06-04 General Electric Company Low wattage fluorescent lamp
US20070001573A1 (en) * 2003-04-22 2007-01-04 Koninklijke Philips Electronics N. V. Assembly of a fluorescent lamp and an extension means
WO2004095503A3 (en) * 2003-04-22 2004-12-16 Koninkl Philips Electronics Nv Assembly of a fluorescent lamp and an extension means
WO2004095503A2 (en) * 2003-04-22 2004-11-04 Koninklijke Philips Electronics N.V. Assembly of a fluorescent lamp and an extension means
US7345423B2 (en) * 2003-04-22 2008-03-18 Koninklijke Philips Electronics, N.V. Assembly of a fluorescent lamp and an extension means
CN100565780C (zh) * 2003-04-22 2009-12-02 皇家飞利浦电子股份有限公司 一种包括荧光灯和扩展装置的组件
US20080278073A1 (en) * 2007-05-09 2008-11-13 General Electric Company Low wattage fluorescent lamp
WO2008140889A2 (en) 2007-05-09 2008-11-20 General Electric Company Low wattage fluorescent lamp
WO2008140889A3 (en) * 2007-05-09 2009-02-12 Gen Electric Low wattage fluorescent lamp
US7800291B2 (en) 2007-05-09 2010-09-21 General Electric Company Low wattage fluorescent lamp
RU2480859C2 (ru) * 2007-05-09 2013-04-27 Дженерал Электрик Компани Люминесцентная лампа с малым потреблением мощности
CN101689475B (zh) * 2007-05-09 2014-06-25 通用电气公司 低瓦数荧光灯

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