CA1303663C - High-pressure mercury vapour discharge lamp - Google Patents
High-pressure mercury vapour discharge lampInfo
- Publication number
- CA1303663C CA1303663C CA000597010A CA597010A CA1303663C CA 1303663 C CA1303663 C CA 1303663C CA 000597010 A CA000597010 A CA 000597010A CA 597010 A CA597010 A CA 597010A CA 1303663 C CA1303663 C CA 1303663C
- Authority
- CA
- Canada
- Prior art keywords
- mercury vapour
- discharge lamp
- mercury
- pressure
- envelope
- 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
Links
Classifications
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/82—Lamps with high-pressure unconstricted discharge having a cold pressure > 400 Torr
Abstract
ABSTRACT:
High-pressure mercury vapour discharge lamp.
A high-pressure mercury vapour discharge lamp, whose envelope (2) has two electrodes (9, 10) of tungsten and a filling containing besides rare gas a quantity of mercury larger than 0.2 mg/mm3 at a mercury vapour pressure of more than 200 bar and at least one of the halogens chlorine, bromine or iodine in a quantity between 10-6 and 10-4 µmol/mm3, the wall load in operation being higher than 1 w/mm2.
Figure 1.
High-pressure mercury vapour discharge lamp.
A high-pressure mercury vapour discharge lamp, whose envelope (2) has two electrodes (9, 10) of tungsten and a filling containing besides rare gas a quantity of mercury larger than 0.2 mg/mm3 at a mercury vapour pressure of more than 200 bar and at least one of the halogens chlorine, bromine or iodine in a quantity between 10-6 and 10-4 µmol/mm3, the wall load in operation being higher than 1 w/mm2.
Figure 1.
Description
~13q~3~3 High-pressure mercury vapour discharge lamp.
The invention relates to a high-pressure mercury vapour discharge lamp comprising an envelope which consists of a material capable of withstanding high temperatures and comprises electrodes of tungsten and a fill~ng substantially 5 consisting of mercury, rare gas and halogen free in the operating condition.
A superhigh-pressure mercury vapour discharge lamp of this kind known from DE-AS 14 89 417 has an elongate quartz glass envelope having a volume of 55 mm3. This 1~ envelope is filled with rare gas and 6.5 mg of mercury; this corresponds to a quantity of mercury of 0.12 mg/mm3. The mercury vapour pressure may be about 120 bar. The lamp has a power density of about 14.5 W/mm3. For lengthening the life, not only the wall of the envelope is cooled, for example by means of a flow of water, but also 5.10-~ to 5. 10-Z g. atoms of at least one of the halogens per cubic millimetre are fed lnto the envelope.
Although such lamps at mercury vapour pressures of about 120 bar produce a high luminance, they yield ~0 essentially a typical mercury spectrum, which ls superimposed on a contlnuous spectrum and contains a small red part.
GB PS 11 09 135 discloses a superhigh-pressure mercury vapour discharge lamp compri~ing a capillary tubular envelope of guartz glass, which is filled with mercury up to '5 a guantity of 0.15 mg per mm' of volume; this corresponds to a mercury vapour pressure of about 150 bar. In order to improve the colour rendition, this lamp is moreover filled with at least one metal iodide. The high electrode load of these lamps results in that tungsten evaporates from the 3C electrodes and is deposited on the wall of the envelope. This leads to a blackening of the envelope, as a result of which the latter is strongly heated, which may give rise to an explosion of the envelope especially at high mercury vapour ~ 3~?3 ~ ~ ~
P~D 88-075 2 06-04-1989 pressures.
The invention has for its o~ject to provide a high-pressure mercury vapour discharge lamp of the kind mentioned in the opening paragraph, which has not only a high luminance 5 and a satisfactory light output, but also an improved colour rendition and a longer life.
According to the invention, this object is achieved in a high-pressure mercury vapour discharge lamp of the ~ind mentioned in the opening paragraph in that the quantity of 1l~ mercury is larger than 0.2 mg per mm3~ the mercury vapour pressure during operation is higher than 200 bar and the wall load is higher than 1 W/mmZ ~ and in that at least one of the halogens Cl, Br and I is present in a quantity between 10-~and 10-4 ~mol per mm3.
- 1~ Up to a mercury vapour pressure of about 150 ~ar, the light output and colour rendition properties of mercury high-pressure lamps are practically constant because essentially a line radiation of the mercury is emitted and an amount of continuous radiation, which originates from the _0 recombinatlon of electrons and mercury atoms. It was a surprise to find that at higher mercury vapour pressures the light output and the colour rendition index increase considerably, which is due to a drastic increase of the amount of continuous radiation. It is presumed that at high .5 pressures of more than 200 bar besides a continuous emission from quasi molecular states also the band emission of real, bound molecule ~tates provides a considerably contribution.
At an operating pressure of about 30~ bar, the continuum part of the visible radiation lies well above 50%. As a result, the red part of the emitted light spectrum is also increased.
For achieving this high mercury vapour pressure, the envelope has a high wall temperature (about 1000C).
Moreover, the lamp envelope is choosen as small as possible to be resistant to this high pressure. The high wall temperature and the small envelope are reflected by the high wall load of at least lW/mmZ. Efficaciously, the envelope consists of quartz glass or aluminium oxide.
~3t~3~i63 The upper limit of the mercury vapour pressure depends upon the strength of the material of the envelope, but may in practical cases lie at about 400 bar. Preferably, the quantity of mercury lies between 0.2 and 0.35 mg per mm3 ' and the mercury vapour pressure lies between 200 and 350 bar.
The very small dimensions of the envelope could lead to an increased blackening of the wall by tun~sten evaporated from the electrodes. Such a blackening of the wall must absolutely be avoided, however, because otherwise the wall temperature increases during the lifetime due to increased absorption of thermal radiation, which would lead to the destruction of the lamp envelope. ~s a measure to avoid such a wall blackening by tungsten transport, the high-pressure mercury vapour discharge lamp according to the invention contains a small guantity of at least one of the halogens chlorine, bromine or iodine. These halogens create a tungsten transport cycle, by which the tungsten evaporated is transported back to the electrodes.
Efficaciously, in the high-pressure discharge lamp ~0 according to the invention, the halogen used is bromine, which is introduced into the lamp in the form of CH2Brz at a filling pressure of about Q.1 mbar. This compound decomposes as soon as the lamp is lit.
The mercury vapour di~charge lamp according to the lnvention does not contain a metal halide because such a high metal halide concentration would be required for a substantial increase of the continuum part of the radiation that a very rapid corrosion of the electrodes would occur due to the high tungsten transport rates. Heavily loaded metal halide lamps, as described, for example, in ~B-PS 1109135, therefore typically reach only lifetimes of a few hundred hours, whereas in the lamps according to the lnvention lifetimes of more than 5000 hours could be reached with a substantially constant light output (~ ~ < 2%) and substantially unchanged colour coordinates (~x, ~ y < 0.005 during 5000 hours).
The lamp according to the invention has a colour . .
.~ .
~3~36~3 temperature of more than 8000 K. The colour temperature and the colour rendition can be further improved in a discharge lamp according to the invention in that the lamp is surrounded by a filter to block blue radiation.
S In this connection, it should be pointed out that it is known from GB-PS 15 39 425 to reduce the blue part of the radiation in high-pressure mercury vapour discharge lamps with halide addition by the use of a filter and hence to attain a colour improvement of the emitted radiation. In mercury vapour discharge lamps at a mercury vapour pressure upto about 150 bar, such a filter would practically be ineffective because the emitted light substantially does not contain a red part. The spectrum of the lamp according to the invention, however, contains such a large part of continuous red radlation that by means of a filter for the blue radiation part, with a loss of light of only 15%, the emission of white light having a colour temperature of about 5500 K and a colour rendition index of about 70 can be attained.
'~Q A few embodiments according to the invention will now be described with reference to the drawing. In the drawing:
Flgure l shows a high-pressure mercury vapour discharge lamp having an elliptical lamp envelope, ~5 Figure 2 shows a high-pressure mercury vapour discharge lamp having a cylindrical lamp envelope, which is surrounded by an outer envelope coated with a filter, Figure 3 shows the emitted light spectrum of a high-pressure mercury vapour discharge lamp at a mercury 3Q vapour pressure of more than 200 bar, and Figure 4 shows the transmission spectrum of a fllter used in the lamp shown in Figure 2.
The high-pressure mercury vapour discharge lamp 1 shown in Figure 1 has an elliptical lamp envelope 2 of quartz glass. The envelope ends are adjoined by cylindrical quartz parts 3 and 4, into which molybdenum foils 5 and 6 are sealed in a vacuum-tight manner. The inner ends of the molybdenum ., ~
~3(?3~i~;3 foils 5 and 6 are connected to electrode pins 7 and 8 of tungsten, which carry wrappings 9 and 10 of tungsten. The outer ends of the molybdenum foils 5 and 6 are adjoined by current supply wires 11 and 12 of molybdenum extending to the exterior.
The high-pressure mercury vapour discharge lamp 13 shown in Figure 2 is constructed in a similar manner as the lamp shown in Figure 1. The lamp envelope 14 is however, of cylindrical shape. The lamp 13 is surrounded by an outer envelope 15 of quartz glass, which is coated on the inner side with an interference filter 16. This filter 16 serves to reduce the blue radiation emitted by the lamp 13.
The data of a few practical embodiments now follow:
Lamp 1 1' Elliptlcal lamp envelope of Figure 1 having a wall thickness of 1.8 mm; the inner dimensions and operating data are:
length 7 mm dlameter 2.5 mm envelope volume 23 mm~
electrode gap 1.2 mm fllling ~ercury 6 mm Hg ~0.261 mg/mm3) halogen 5 . lO-~ ,umol of CH2Br2 (lO-~ ,umol of Br/mm3) 7 5 operating pressure about 200 bar power 50 W
operating voltage 76 V
llght output 58 lm/W
wall load 1.30 W/mm Lamp 2 Elliptical lamp envelope of Figure 1 ha~ing a wall thickness of 1.~ mm; the inner dimensions and operating data are:
length 5 mm diameter 2.5 mm envelope volume 16.5 mm3 i~,.. ... .
~3~}36~3 electrode gap 1.0 mm fil1ing mercury 4 mg of Hg ~0.243 mg~mm3) halogen 5 . 10-~ ~mol/mm3 of CH2Brz operating pressure about 220 bar power 40 W
operating voltage 80 V
light output 56 lm/W
wall load 1.30 w/mm2.
Lamp 3 Cylindrical lamp envelope of Figure 2 having a wall thickness of 1.3 mm, without an outer envelope. The inner dimensions and operating data are:
length 4 mm - diameter 1.5 mm envelope volume 7 mm' electrode gap 1.0 mm filling mercury 2.5 mg of Hg (0.357 mg/mm3) halogen 5 . 10-~ ~mol/mm~ of CH2Brz operating pressure 300 bar power 30 W
operating voltage 92 V
light output 60 lm/W
wall load 1.36 W/mmZ.
~he lamps described have a colour temperature of more than ~5 8000 K; however, the colour rendition has considerably improved in comparison with lamps having a low operating pressure. For example, the colour rendltion index R~ ls for the three lamps just descrlbed 51.5, 55.2 and 61.6, whereas with similar lamps at an operating pressure of 100 bar only a 3~ colour renditlon index of 32.7 was attained.
In Figure 3, the light spectrum emltted by a lamp according to example 2 is plotted as intensity I against the wavelength. It appears therefrom that the continuum part of the visible radiation lies at about 50%.
~5 In the lamp shown in Figure 2, the interference 13(~36~3 filter 16 consists, for example, of an alternatinq sequency of layers of titanium dioxide modified with Zroz and amorphous silicon dioxide. In a practical embodiment, the filter used had a degree of transmission Tr as represented in Figure 4 as a function of the wavelength ~. The following light-technical data were then found:
Without a filter: colour temperature: 8580 colour rendition index: 55.2 light output: 56 lm/W
1~ With a filter: colour temperature: 5500 K
colour rendition index: 69.7 light output: 48 lm/W.
It appears therefrom that by the interference filter not only the colour temperature is strongly reduced, 1~ but also the colour rendition index has considerably improved.
With respect to comparable heavily loaded metal halide lamps, the lamps according to the invention have an extremely high constancy of the light-technical data, a 0 substantially unchanged light output during the operating time and a very long life. While lifetimes of a few hundred hours are attained with heavily loaded metal halide lamps, the lamps according to the invention substantially do not exhlbit any changes even after an operating tlme of more than '5 S000 hours.
The invention relates to a high-pressure mercury vapour discharge lamp comprising an envelope which consists of a material capable of withstanding high temperatures and comprises electrodes of tungsten and a fill~ng substantially 5 consisting of mercury, rare gas and halogen free in the operating condition.
A superhigh-pressure mercury vapour discharge lamp of this kind known from DE-AS 14 89 417 has an elongate quartz glass envelope having a volume of 55 mm3. This 1~ envelope is filled with rare gas and 6.5 mg of mercury; this corresponds to a quantity of mercury of 0.12 mg/mm3. The mercury vapour pressure may be about 120 bar. The lamp has a power density of about 14.5 W/mm3. For lengthening the life, not only the wall of the envelope is cooled, for example by means of a flow of water, but also 5.10-~ to 5. 10-Z g. atoms of at least one of the halogens per cubic millimetre are fed lnto the envelope.
Although such lamps at mercury vapour pressures of about 120 bar produce a high luminance, they yield ~0 essentially a typical mercury spectrum, which ls superimposed on a contlnuous spectrum and contains a small red part.
GB PS 11 09 135 discloses a superhigh-pressure mercury vapour discharge lamp compri~ing a capillary tubular envelope of guartz glass, which is filled with mercury up to '5 a guantity of 0.15 mg per mm' of volume; this corresponds to a mercury vapour pressure of about 150 bar. In order to improve the colour rendition, this lamp is moreover filled with at least one metal iodide. The high electrode load of these lamps results in that tungsten evaporates from the 3C electrodes and is deposited on the wall of the envelope. This leads to a blackening of the envelope, as a result of which the latter is strongly heated, which may give rise to an explosion of the envelope especially at high mercury vapour ~ 3~?3 ~ ~ ~
P~D 88-075 2 06-04-1989 pressures.
The invention has for its o~ject to provide a high-pressure mercury vapour discharge lamp of the kind mentioned in the opening paragraph, which has not only a high luminance 5 and a satisfactory light output, but also an improved colour rendition and a longer life.
According to the invention, this object is achieved in a high-pressure mercury vapour discharge lamp of the ~ind mentioned in the opening paragraph in that the quantity of 1l~ mercury is larger than 0.2 mg per mm3~ the mercury vapour pressure during operation is higher than 200 bar and the wall load is higher than 1 W/mmZ ~ and in that at least one of the halogens Cl, Br and I is present in a quantity between 10-~and 10-4 ~mol per mm3.
- 1~ Up to a mercury vapour pressure of about 150 ~ar, the light output and colour rendition properties of mercury high-pressure lamps are practically constant because essentially a line radiation of the mercury is emitted and an amount of continuous radiation, which originates from the _0 recombinatlon of electrons and mercury atoms. It was a surprise to find that at higher mercury vapour pressures the light output and the colour rendition index increase considerably, which is due to a drastic increase of the amount of continuous radiation. It is presumed that at high .5 pressures of more than 200 bar besides a continuous emission from quasi molecular states also the band emission of real, bound molecule ~tates provides a considerably contribution.
At an operating pressure of about 30~ bar, the continuum part of the visible radiation lies well above 50%. As a result, the red part of the emitted light spectrum is also increased.
For achieving this high mercury vapour pressure, the envelope has a high wall temperature (about 1000C).
Moreover, the lamp envelope is choosen as small as possible to be resistant to this high pressure. The high wall temperature and the small envelope are reflected by the high wall load of at least lW/mmZ. Efficaciously, the envelope consists of quartz glass or aluminium oxide.
~3t~3~i63 The upper limit of the mercury vapour pressure depends upon the strength of the material of the envelope, but may in practical cases lie at about 400 bar. Preferably, the quantity of mercury lies between 0.2 and 0.35 mg per mm3 ' and the mercury vapour pressure lies between 200 and 350 bar.
The very small dimensions of the envelope could lead to an increased blackening of the wall by tun~sten evaporated from the electrodes. Such a blackening of the wall must absolutely be avoided, however, because otherwise the wall temperature increases during the lifetime due to increased absorption of thermal radiation, which would lead to the destruction of the lamp envelope. ~s a measure to avoid such a wall blackening by tungsten transport, the high-pressure mercury vapour discharge lamp according to the invention contains a small guantity of at least one of the halogens chlorine, bromine or iodine. These halogens create a tungsten transport cycle, by which the tungsten evaporated is transported back to the electrodes.
Efficaciously, in the high-pressure discharge lamp ~0 according to the invention, the halogen used is bromine, which is introduced into the lamp in the form of CH2Brz at a filling pressure of about Q.1 mbar. This compound decomposes as soon as the lamp is lit.
The mercury vapour di~charge lamp according to the lnvention does not contain a metal halide because such a high metal halide concentration would be required for a substantial increase of the continuum part of the radiation that a very rapid corrosion of the electrodes would occur due to the high tungsten transport rates. Heavily loaded metal halide lamps, as described, for example, in ~B-PS 1109135, therefore typically reach only lifetimes of a few hundred hours, whereas in the lamps according to the lnvention lifetimes of more than 5000 hours could be reached with a substantially constant light output (~ ~ < 2%) and substantially unchanged colour coordinates (~x, ~ y < 0.005 during 5000 hours).
The lamp according to the invention has a colour . .
.~ .
~3~36~3 temperature of more than 8000 K. The colour temperature and the colour rendition can be further improved in a discharge lamp according to the invention in that the lamp is surrounded by a filter to block blue radiation.
S In this connection, it should be pointed out that it is known from GB-PS 15 39 425 to reduce the blue part of the radiation in high-pressure mercury vapour discharge lamps with halide addition by the use of a filter and hence to attain a colour improvement of the emitted radiation. In mercury vapour discharge lamps at a mercury vapour pressure upto about 150 bar, such a filter would practically be ineffective because the emitted light substantially does not contain a red part. The spectrum of the lamp according to the invention, however, contains such a large part of continuous red radlation that by means of a filter for the blue radiation part, with a loss of light of only 15%, the emission of white light having a colour temperature of about 5500 K and a colour rendition index of about 70 can be attained.
'~Q A few embodiments according to the invention will now be described with reference to the drawing. In the drawing:
Flgure l shows a high-pressure mercury vapour discharge lamp having an elliptical lamp envelope, ~5 Figure 2 shows a high-pressure mercury vapour discharge lamp having a cylindrical lamp envelope, which is surrounded by an outer envelope coated with a filter, Figure 3 shows the emitted light spectrum of a high-pressure mercury vapour discharge lamp at a mercury 3Q vapour pressure of more than 200 bar, and Figure 4 shows the transmission spectrum of a fllter used in the lamp shown in Figure 2.
The high-pressure mercury vapour discharge lamp 1 shown in Figure 1 has an elliptical lamp envelope 2 of quartz glass. The envelope ends are adjoined by cylindrical quartz parts 3 and 4, into which molybdenum foils 5 and 6 are sealed in a vacuum-tight manner. The inner ends of the molybdenum ., ~
~3(?3~i~;3 foils 5 and 6 are connected to electrode pins 7 and 8 of tungsten, which carry wrappings 9 and 10 of tungsten. The outer ends of the molybdenum foils 5 and 6 are adjoined by current supply wires 11 and 12 of molybdenum extending to the exterior.
The high-pressure mercury vapour discharge lamp 13 shown in Figure 2 is constructed in a similar manner as the lamp shown in Figure 1. The lamp envelope 14 is however, of cylindrical shape. The lamp 13 is surrounded by an outer envelope 15 of quartz glass, which is coated on the inner side with an interference filter 16. This filter 16 serves to reduce the blue radiation emitted by the lamp 13.
The data of a few practical embodiments now follow:
Lamp 1 1' Elliptlcal lamp envelope of Figure 1 having a wall thickness of 1.8 mm; the inner dimensions and operating data are:
length 7 mm dlameter 2.5 mm envelope volume 23 mm~
electrode gap 1.2 mm fllling ~ercury 6 mm Hg ~0.261 mg/mm3) halogen 5 . lO-~ ,umol of CH2Br2 (lO-~ ,umol of Br/mm3) 7 5 operating pressure about 200 bar power 50 W
operating voltage 76 V
llght output 58 lm/W
wall load 1.30 W/mm Lamp 2 Elliptical lamp envelope of Figure 1 ha~ing a wall thickness of 1.~ mm; the inner dimensions and operating data are:
length 5 mm diameter 2.5 mm envelope volume 16.5 mm3 i~,.. ... .
~3~}36~3 electrode gap 1.0 mm fil1ing mercury 4 mg of Hg ~0.243 mg~mm3) halogen 5 . 10-~ ~mol/mm3 of CH2Brz operating pressure about 220 bar power 40 W
operating voltage 80 V
light output 56 lm/W
wall load 1.30 w/mm2.
Lamp 3 Cylindrical lamp envelope of Figure 2 having a wall thickness of 1.3 mm, without an outer envelope. The inner dimensions and operating data are:
length 4 mm - diameter 1.5 mm envelope volume 7 mm' electrode gap 1.0 mm filling mercury 2.5 mg of Hg (0.357 mg/mm3) halogen 5 . 10-~ ~mol/mm~ of CH2Brz operating pressure 300 bar power 30 W
operating voltage 92 V
light output 60 lm/W
wall load 1.36 W/mmZ.
~he lamps described have a colour temperature of more than ~5 8000 K; however, the colour rendition has considerably improved in comparison with lamps having a low operating pressure. For example, the colour rendltion index R~ ls for the three lamps just descrlbed 51.5, 55.2 and 61.6, whereas with similar lamps at an operating pressure of 100 bar only a 3~ colour renditlon index of 32.7 was attained.
In Figure 3, the light spectrum emltted by a lamp according to example 2 is plotted as intensity I against the wavelength. It appears therefrom that the continuum part of the visible radiation lies at about 50%.
~5 In the lamp shown in Figure 2, the interference 13(~36~3 filter 16 consists, for example, of an alternatinq sequency of layers of titanium dioxide modified with Zroz and amorphous silicon dioxide. In a practical embodiment, the filter used had a degree of transmission Tr as represented in Figure 4 as a function of the wavelength ~. The following light-technical data were then found:
Without a filter: colour temperature: 8580 colour rendition index: 55.2 light output: 56 lm/W
1~ With a filter: colour temperature: 5500 K
colour rendition index: 69.7 light output: 48 lm/W.
It appears therefrom that by the interference filter not only the colour temperature is strongly reduced, 1~ but also the colour rendition index has considerably improved.
With respect to comparable heavily loaded metal halide lamps, the lamps according to the invention have an extremely high constancy of the light-technical data, a 0 substantially unchanged light output during the operating time and a very long life. While lifetimes of a few hundred hours are attained with heavily loaded metal halide lamps, the lamps according to the invention substantially do not exhlbit any changes even after an operating tlme of more than '5 S000 hours.
Claims (3)
1. A high-pressure mercury vapour discharge lamp comprising an envelope of a material capable of withstanding high temperatures, which has electrodes of tungsten and a filling essentially consisting of mercury, rare gas and halogen free in the operating condition, characterized in that the quantity of mercury is larger than 0.2 mg/mm3, the mercury vapour pressure is higher than 200 bar and the wall load is higher than 1 W/mm2, and in that at least one of the halogens C1, Br or I is present in a quantity between 10-6 and 10-4 µmol/mm3.
2. A discharge lamp as claimed in Claim 1, characterized in that the quantity of mercury lies between o.2 and 0.35 mg/mm3 and the mercury vapour pressure in operation lies between 200 and 350 bar.
3. A discharge lamp as claimed in claim 1 or 2 characterized in that it is surrounded by a filter blocking blue radiation.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP3813421.7 | 1988-04-21 | ||
| DE3813421A DE3813421A1 (en) | 1988-04-21 | 1988-04-21 | HIGH PRESSURE MERCURY VAPOR DISCHARGE LAMP |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1303663C true CA1303663C (en) | 1992-06-16 |
Family
ID=6352557
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000597010A Expired - Lifetime CA1303663C (en) | 1988-04-21 | 1989-04-18 | High-pressure mercury vapour discharge lamp |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US5109181A (en) |
| EP (1) | EP0338637B1 (en) |
| JP (1) | JP2829339B2 (en) |
| KR (1) | KR0129172B1 (en) |
| CN (1) | CN1024728C (en) |
| CA (1) | CA1303663C (en) |
| DD (1) | DD283875A5 (en) |
| DE (2) | DE3813421A1 (en) |
| ES (1) | ES2076199T3 (en) |
| HU (1) | HU200519B (en) |
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| US5471110A (en) * | 1991-12-23 | 1995-11-28 | Philips Electronics North America Corporation | High pressure discharge lamp having filament electrodes |
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| EP0576071B1 (en) * | 1992-06-23 | 1996-09-04 | Koninklijke Philips Electronics N.V. | High pressure mercury discharge lamp |
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| DE4432315A1 (en) * | 1994-09-12 | 1996-03-14 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Mercury vapor short arc lamp |
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| JP2948200B1 (en) * | 1998-04-08 | 1999-09-13 | ウシオ電機株式会社 | High pressure mercury lamp |
| JP2980882B2 (en) * | 1998-04-08 | 1999-11-22 | ウシオ電機株式会社 | High pressure mercury lamp |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL291092A (en) * | 1963-04-03 | |||
| NL6408081A (en) * | 1964-07-16 | 1966-01-17 | ||
| US3714493A (en) * | 1970-04-06 | 1973-01-30 | Gen Electric | Compact metal halide arc lamp containing primarily mercury iodide |
| DE2519377A1 (en) * | 1975-04-30 | 1976-11-11 | Patra Patent Treuhand | MERCURY VAPOR HIGH PRESSURE DISCHARGE LAMP |
| NL184550C (en) * | 1982-12-01 | 1989-08-16 | Philips Nv | GAS DISCHARGE LAMP. |
| DE8505119U1 (en) * | 1985-02-22 | 1987-08-06 | Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen Mbh, 8000 Muenchen, De |
-
1988
- 1988-04-21 DE DE3813421A patent/DE3813421A1/en not_active Withdrawn
-
1989
- 1989-04-14 HU HU891868A patent/HU200519B/en unknown
- 1989-04-17 DE DE58909367T patent/DE58909367D1/en not_active Expired - Lifetime
- 1989-04-17 EP EP89200974A patent/EP0338637B1/en not_active Expired - Lifetime
- 1989-04-17 ES ES89200974T patent/ES2076199T3/en not_active Expired - Lifetime
- 1989-04-17 US US07/339,540 patent/US5109181A/en not_active Expired - Lifetime
- 1989-04-18 CA CA000597010A patent/CA1303663C/en not_active Expired - Lifetime
- 1989-04-18 DD DD89327728A patent/DD283875A5/en not_active IP Right Cessation
- 1989-04-18 KR KR1019890005042A patent/KR0129172B1/en not_active IP Right Cessation
- 1989-04-18 CN CN89102533A patent/CN1024728C/en not_active Expired - Lifetime
- 1989-04-20 JP JP1098984A patent/JP2829339B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US5109181A (en) | 1992-04-28 |
| KR0129172B1 (en) | 1998-04-06 |
| DE3813421A1 (en) | 1989-11-02 |
| KR890016618A (en) | 1989-11-29 |
| DE58909367D1 (en) | 1995-09-07 |
| DD283875A5 (en) | 1990-10-24 |
| JPH02148561A (en) | 1990-06-07 |
| CN1024728C (en) | 1994-05-25 |
| EP0338637A2 (en) | 1989-10-25 |
| EP0338637B1 (en) | 1995-08-02 |
| CN1037235A (en) | 1989-11-15 |
| HUT50530A (en) | 1990-02-28 |
| JP2829339B2 (en) | 1998-11-25 |
| ES2076199T3 (en) | 1995-11-01 |
| EP0338637A3 (en) | 1991-04-03 |
| HU200519B (en) | 1990-06-28 |
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