EP0079969A1 - Unite de lampe a decharge a vapeur de mercure a faible pression - Google Patents
Unite de lampe a decharge a vapeur de mercure a faible pression Download PDFInfo
- Publication number
- EP0079969A1 EP0079969A1 EP82901620A EP82901620A EP0079969A1 EP 0079969 A1 EP0079969 A1 EP 0079969A1 EP 82901620 A EP82901620 A EP 82901620A EP 82901620 A EP82901620 A EP 82901620A EP 0079969 A1 EP0079969 A1 EP 0079969A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- discharge lamp
- mercury vapor
- low pressure
- firing
- pressure mercury
- 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.)
- Granted
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Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/36—Controlling
- H05B41/38—Controlling the intensity of light
- H05B41/39—Controlling the intensity of light continuously
- H05B41/392—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor
- H05B41/3921—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations
- H05B41/3927—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations by pulse width modulation
Definitions
- This invention relates to a low pressure mercury vapor discharge lamp device including a low pressure mercury vapor discharge lamp, for example a fluorescent lamp, combined with a firing device for firing the discharge lamp at a high frequency.
- the present invention arises from the previously unexpected phenomenon that the energy transition from 6 3 P I to 6 4 So of mercury atoms is attended with a sharp increase in energy efficiency of radiation at 235.7nm by providing a pause time period of not less than 0.5 x 10 -6 second and not larger than 15 x 10 -6 seconds in the voltage applied across the electrodes of a low pressure mercury vapor discharge lamp containing a rare gas composed of at least one of the elements Kr and Xe or at least one of rare gases low in ionization voltages such as Kr and Xe during the AC firing thereof at a frequency not less than 1 KHz, the inside diameter 0 in mm of the discharge lamp to being 23 ⁇ D ⁇ 35 and the ratio X/Y of the total molar number X of the rare gas or gases to the molar number Y of mercury vapor within the discharge lamp 10 being kept in the range 0.5 x 10 2 ⁇ X/Y ⁇ 1.0 x 10 4 .
- FIG. 1 is a sectional view illustrating an electric discharge lamp 4 used in this fundamental experiment wherein 1 is a bulb made of quartz glass which bulb is filled with a rare gas and mercury b in the liquid phase which is a mercury vapor generator. A preheated type electrode 2 is sealed through each end of the bulb and an electric discharge path a is formed between the electrodes.
- the inside tube diameter of the bulb 1 is 30 mm, and the tube length L is 1187 mm as defined by the outer ends of the bulb.
- the low pressure mercury vapor discharge lamps used were a 40 W rapid start type flurescent lamp and a discharge lamp identical in specification thereto and having the bulb made of quartz glass and not coated with phosphors.
- Figure 2 is a view illustrating an experimental device comprising a commercial 100 V AC electric source 5, a filament transformer 6 energized by the electric source 5, an electric source 7 of rectangular waves for supplying a voltage having an application time period T and a pause time period TO as will be described later, a switch 8 provided in a preheating circuit for the electrodes 2, and a variable resistance ballast 9 for controlling the discharge current through the discharge lamp.
- Fluorescent lamps 4 with a tube length L of 118 mm and an inside tube diameter D of 30 mm were used principally but for a small number thereof a different diameter was used in the range 22 to 36 mm.
- the rare gas filling was of various single elementary gases and mixtures thereof and their filling amounts have been changed to large extents.
- the mercury (b) was filled in a substantially constant amount of 25 mg.
- a 40 W rapid start type fluorescent lamp has then been used as the discharge lamp and the relative magnitude of its luminous flux has been measured, for changes of the time period T 0 at a constant frequency of 17 KHz with a constant current having the effective value of 0.42 A.
- Fig. 4 shows the result thereof.
- the solid line A. is data for the discharge lamp 4 filled with argon under about 2.6 Torrs and the chain line B with single dots is data for the discharge lamp 4 filled with a mixed gas or argon (35%), krypton (45%) and neon (20%) under about 2.2 Torrs.
- the magnitude of the luminous flux in Figure 5 is relative to the magnitude of luminous flux obtained when the firing is effected by a commercial AC electric source using a reference ballast prescribed by JIS, considered at 100%.
- the effect of providing the pause time period T 0 can always be observed at firing frequencies of not less than 1 KHz and it is found that its effect is maximum at a firing frequency lying in the vicinity of 20 KHz.
- the maximum value of the relative magnitude of the luminous flux changes with the individual parameters such as the pause time period, composition of the rare gases filled in the lamp etc. but it has been confirmed in any event that, if the pause time period is 0.5 to 1.5 ⁇ s and the firing frequency is not less than 1 KHz, then a high magnitude of the luminous flux is obtained as compared with firing at a conventional frequency.
- FIG. 6 shows an AC 100 V electric source 5, a switch 10 for the electric source, a full-wave rectifier 11, a smoothing capacitor 12, a voltage dividing resistance 13, a constant voltage diode 14, an IC 15 for regulating the switching, a pair of output transistors 15a for the IC, and a pair of transistors 16 for amplifying the output which transistors form a push-pull circuit with the output transformers 17.
- 18 is a voltage dividing resistance which is resistance for supplying currents to bases of the respective transistors through the transistors 15a
- 17S is the secondary winding of the transformer
- 17F are a pair of filament windings
- 19 is a capacitor ballast.
- the pause time period TO may be indefinite as shown in Figure 7, the present invention defines it as described below.
- the pause time period T 0 is defined as (t 0 + t l + t 2 ); the pause time period T 0 is taken to be equal to t 0 when the time interval t 0 for zero voltage is longer than 5(t 1 + t 2 ).
- the firing frequency is selected in consideration of the switching characteristics and other characteristics of the firing circuit. It is considered that in the existing high frequency firing technique from 10 to 60 KHz are desirable but if the high frequency firing technique advances in the future then it will be sufficiently possible in view of practical use to effect the firing with a pulse frequency of several hundred KHz.
- the said molar ratio X/Y is a quantity approximately obtained from the ratio of the pressure of the rare gas filling at 40° to the vapor pressure of the mercury at 40°C.
- Figure 8 shows the variation in relative intensity of resonance radiation of mercury at 253.7 mm for said discharge lamp fired with a peak current value of 0.42 A (of substantially a rectangular wave) at 20-KHz in a stream of water at 40°C, with the pause time period T 0 changed. While in this Figure the intensity is made 100% with a pause time period TO of zero, this value is about 17% higher than that in the firing with a commercial electric source. As seen in Figure 8, the intensity becomes maximum with the time period T 0 of 7 to 8 x 10 -6 second and the increase in relative intensity reaches 35%. Also for time periods TO of more than 15 x 10 -6 seconds the intensity is less than that in the absence of the pause time period T 0 .
- Figure 9 shows the variation in relative intensity of the radiation at 253.7 mm when the same discharge lamp as that used in the measurements of Figure 8 is used and the firing frequency is changed.
- the solid line in Figure 9 illustrates the case where the pause time period T 0 is a constant of about 7 x 10 -6 at frequencies of not higher than 36 KHz and where the ratio of the time period T 1 to T 0 is set to about 1 at frequencies in excess of 36 KHz.
- the chain line with single dots is the case where the time period T 0 is zero.
- the temperature of running water was 40°C and the peak current value was 0.42A.
- Figure 9 shows the intensity of radiation with the firing effected by a commercial electric source as 100%. As seen in Figure 9, the effect of providing the pause time period T 0 is always observed at firing frequencies-not less than 1 KHz and that effect is maximum when the firing frequency is near to 20 KHz.
- the limitation of the molar ratio X/Y according to the present invention results from the fact that, when the sort of rare gases, the firing frequency and the pause time period T 0 are determined, the generation and extinction of the moving striations is effected on a boundary made of a border line as determined by the molar ratio X/Y and the apparent atom temperature T of the rare gas. Also in this embodiment the lamp was fired by means of the circuit of the configuration shown in Figure 6 and brought into the steady state with said firing device A used, after which the measurements of the magnitude of the luminous flux and electric power were effected.
- the molar ratio X/Y (which was obtained assuming that the atom temperature of the rare gas corresponds to the temperature on the central portion of the tube and the vapor pressure of mercury corresponds to the temperature on the coldest portion) has amounted to 0.64 x 10 8 and high values not previously existing were provided so that, as compared with the firing with the commercial frequency, the increase in efficiency of the lamp alone was about 16% and the increase in efficiency of the device as a whole was about 30%.
- a discharge lamp was fired with a peak current value of 2 A, with an In - Hg amalgam or amalgams disposed in the vicinity of the electrodes 2 in place of the liquid phase mercury b, with a bulb 36 mm in inside tube diameter and 2354 mm in tube length L filled with a rare gas mixture having a molar mixture ratio of Ne to Ar of 7 to 3.
- the vapor pressure of the mercury was 4.5 x 10 -3 Torrs and the molar ratio X/Y amounted to 0.56 x 10 3 , while the increase in efficiency of the lamp alone was 14% and the increase in efficiency of the device as a whole was about 36%.
- said embodiments relate to discharge lamps comparatively high in practical use and illustrate only several examples of the effect of the present invention.
- the fact that the lamp efficiency is devised to increase by the provision of the proper pause time period TO can be said to be effective for a very wide variety of discharge lamps.
- the maximum value of the relative magnitude of the luminous flux is changed with the firing frequency, the pause time period, the composition of gases filled in the lamp etc., but it has been confirmed that, when the firing is effected at not less than 1 KHz and the pause time period is 0.5 to 15 ⁇ s, the relative magnitude of the luminous flux is increased as compared with the conventional firing at a commercial frequency without the provision of the pause time period.
Landscapes
- Circuit Arrangements For Discharge Lamps (AREA)
Abstract
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8144181A JPS57196497A (en) | 1981-05-28 | 1981-05-28 | Low pressure mercury vapor discharge lamp firing device |
JP81441/81 | 1981-05-28 | ||
JP11036981A JPS5812251A (ja) | 1981-07-15 | 1981-07-15 | 低圧水銀蒸気放電灯装置 |
JP110369/81 | 1981-07-15 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0079969A1 true EP0079969A1 (fr) | 1983-06-01 |
EP0079969A4 EP0079969A4 (fr) | 1984-11-07 |
EP0079969B1 EP0079969B1 (fr) | 1988-11-02 |
Family
ID=26422465
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP82901620A Expired EP0079969B1 (fr) | 1981-05-28 | 1982-05-28 | Unite de lampe a decharge a vapeur de mercure a faible pression |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0079969B1 (fr) |
DE (1) | DE3279197D1 (fr) |
WO (1) | WO1982004373A1 (fr) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2134701A (en) * | 1982-12-29 | 1984-08-15 | Philips Nv | Metal vapour discharge |
EP0435231A1 (fr) * | 1989-12-29 | 1991-07-03 | Zumtobel Aktiengesellschaft | Procédé pour varier la puissance fournie par des tubes fluorescents |
EP0729694A1 (fr) * | 1993-11-03 | 1996-09-04 | Science Applications International Corporation | Systeme d'illumination uv par l'arriere a haute efficacite pour dispositifs d'affichage electroniques |
EP1304721A1 (fr) * | 2001-10-18 | 2003-04-23 | General Electric Company | Lampe fluorescente à passe puissance |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL166381C (nl) * | 1971-05-08 | 1981-07-15 | Philips Nv | Werkwijze voor het bedrijven van een lagedrukkwikdamp- ontladingslamp, en inrichting voor het uitvoeren van deze werkwijze. |
JPS4962372U (fr) * | 1972-09-06 | 1974-05-31 | ||
JPS49103278U (fr) * | 1972-12-25 | 1974-09-05 |
-
1982
- 1982-05-28 WO PCT/JP1982/000206 patent/WO1982004373A1/fr active IP Right Grant
- 1982-05-28 DE DE8282901620T patent/DE3279197D1/de not_active Expired
- 1982-05-28 EP EP82901620A patent/EP0079969B1/fr not_active Expired
Non-Patent Citations (1)
Title |
---|
See references of WO8204373A1 * |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2134701A (en) * | 1982-12-29 | 1984-08-15 | Philips Nv | Metal vapour discharge |
AT383245B (de) * | 1982-12-29 | 1987-06-10 | Philips Nv | Anordnung mit einer mit zumindest zwei innenelektroden ausgeruesteten metalldampfentladungslampe |
EP0435231A1 (fr) * | 1989-12-29 | 1991-07-03 | Zumtobel Aktiengesellschaft | Procédé pour varier la puissance fournie par des tubes fluorescents |
EP0729694A1 (fr) * | 1993-11-03 | 1996-09-04 | Science Applications International Corporation | Systeme d'illumination uv par l'arriere a haute efficacite pour dispositifs d'affichage electroniques |
EP0729694A4 (fr) * | 1993-11-03 | 1997-02-26 | Science Applic Int Corp | Systeme d'illumination uv par l'arriere a haute efficacite pour dispositifs d'affichage electroniques |
EP1304721A1 (fr) * | 2001-10-18 | 2003-04-23 | General Electric Company | Lampe fluorescente à passe puissance |
Also Published As
Publication number | Publication date |
---|---|
EP0079969B1 (fr) | 1988-11-02 |
DE3279197D1 (en) | 1988-12-08 |
WO1982004373A1 (fr) | 1982-12-09 |
EP0079969A4 (fr) | 1984-11-07 |
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