EP0871202A2 - Metal halide discharge lamp - Google Patents
Metal halide discharge lamp Download PDFInfo
- Publication number
- EP0871202A2 EP0871202A2 EP98104337A EP98104337A EP0871202A2 EP 0871202 A2 EP0871202 A2 EP 0871202A2 EP 98104337 A EP98104337 A EP 98104337A EP 98104337 A EP98104337 A EP 98104337A EP 0871202 A2 EP0871202 A2 EP 0871202A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- discharge lamp
- metal halide
- halide discharge
- set forth
- satin finish
- 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.)
- Withdrawn
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Classifications
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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
- H01J61/36—Seals between parts of vessels; Seals for leading-in conductors; Leading-in conductors
Definitions
- the present invention relates to a discharge lamp and, in particular, a discharge lamp in which metal halide is added into mercury vapor for improving color rendering property.
- FIG. 3 shows a construction of a metal halide discharge lamp of prior art.
- a metal foil leading-in wire 93 made of molybdenum etc. is held and sealed by thermally deforming the bulb 91.
- the use of the metallic foil leading-in wire permits an increase of surface area as a conductive material and a reduction in pressure of the discharge room 91a per unit area.
- both are merely in contact with a flat surface as shown in FIG. 4.
- thermal stresses of temperature rise and fall due to the repetitive lighting and lighting-off a contact between the two becomes gradually loose, leading to leaks.
- Japanese Patent Publication No. Hei. 5-3703 describes a construction where sealing is performed by deposing a conductive material of round bar on a bulb by using a frit.
- a round bar shaped conductive material displays a disadvantage that the ratio of the surface area to the volume, i.e., the ratio of the periphery to the sectional area, becomes small. Since the sectional area requires a specified value according to the discharge current value, if the periphery length is small for the same sectional area, the pressure of a discharge room applied per unit length is increased. Accordingly, for the whole conductive material, the pressure of the discharge room per unit area is increased, which is disadvantageous in preventing leaks.
- the frit is interposed for increasing the adhesive strength between a bulb and a conductive material, the frit is melted at the time of sealing to deposit on the bulb and the conductive material. Therefore, at this melting, impurities contained in the frit or the composition of the frit evaporate and then enter the discharge room to damage discharge lamp properties.
- a metal halide discharge lamp comprising a metal foil leading-in wire held and sealed by a thermally deformed glass bulb, characterized in that at least one of surfaces of the metal foil leading-in wire are furnished with a satin finish.
- the metal halide discharge lamp including the metallic foil leading-in wire with the satin finished both surfaces that is held and sealed by a bulb is free from the problem of prior art that the lift time of halide discharge lamps is reduced depending upon the number of lighting and lighting-off. It is therefore possible to apply to cases where flickering is made frequently, e.g., head lamps of automobiles, to expand the use of metal halide discharge lamps of this type, and to improve the reliability.
- the satin finish by a sand blasting finish using corundum abrasive grains or an electric field deposition using a melted metallic salt prevents matters which will be harmful by heating for sealing with a bulb from entering the discharge room. This avoids an additional step, e.g., elimination of remaining abrasive grains, and facilitates to practice the discharge lamp of the present invention, without causing no cost rise.
- FIG. 1 is a sectional view of a metal halide discharge lamp according to a preferred embodiment of the present invention.
- FIG. 2 is a sectional view along line A-A of FIG. 1.
- FIG. 3 is a sectional view of a metal halide discharge lamp of prior art.
- FIG. 4 is a sectional view along line B-B of FIG. 3.
- reference numeral 1 indicates a metal halide discharge lamp according to one embodiment of the present invention.
- a metal foil leading-in wire 4 made of molybdenum is employed as a conductive material so as to produce a greater surface area for sectional area, in order that the gastightness of a discharge room 2a is maintained when performing a feeding from the exterior to a discharging electrode 3 disposed in the discharge room 2a of a bulb 2.
- metal foil leading-in wire 4 Metal materials as a material of the metal foil leading-in wire 4 are supplied in the market after they are formed, e.g., by means of rolling, into the form of foil (plate) by manufacturers so as to have a specified thickness, and further treated to have a fairly smooth surface, i.e., flaw-free, for increasing their commercial value.
- the present invention is directed to obtain a peripheral length greater than that defined by the sectional shape of a metal foil leading-in wire 4 by providing a satin finish 4a on at least one of the surfaces of the aforesaid metal material to produce fine irregularities thereon, as shown in FIG. 2.
- satin finish 4a As a first means, there is a manner executed by mechanical means, such as sand blasting, in which abrasive grains that are fine powders of a material having an appropriate hardness are sprayed and collided on the surface of a metal foil leading-in wire 4 or of a metal material that is a material to form the metal foil leading-in wire 4.
- mechanical means such as sand blasting, in which abrasive grains that are fine powders of a material having an appropriate hardness are sprayed and collided on the surface of a metal foil leading-in wire 4 or of a metal material that is a material to form the metal foil leading-in wire 4.
- silicon carbide As abrasive grains of this type, silicon carbide (SiC), hereinafter referred to as carborundum, is generally employed because of its outstanding work efficiency in addition to its hardness.
- SiC silicon carbide
- carborundum silicon carbide
- the abrasive grains of silicon carbide have high hardness, they are strongly cut into the metal foil leading-in wire 4. It is therefore very difficult to eliminate the remaining abrasive grains on the surface after a sand blasting. The remaining abrasive grains sublime at the step of sealing, adhere to a discharging electrode 3 and disappear, which will then make the surface black.
- alumina Al 2 O 3
- corundum alumina
- the present invention employs alumina as an abrasive grain. This avoids a step of eliminating such remaining abrasive grains as described above to reduce the number of steps as a whole.
- a satin finish 4a there is chemical means, such as an electric field deposition using a melted metallic salt.
- chemical means such as an electric field deposition using a melted metallic salt.
- the following description is made taking an example of molybdenum but not limited to this alone.
- Other metals or metal mixtures are useable for the metal foil leading-in wire 4.
- molybdenum chloride MoCl 5
- MoCl 5 molybdenum chloride having a low melting point
- molybdenum chloride is melted in a crucible under an argon atmosphere and then subjected to an electric field deposition by using molybdenum as an electrode.
- the molybdenum is deposited in a manner of (Mo 5+ +5e - ⁇ Mo) on a cathode side, and therefore, by forming a metal foil lead-in wire 4 with this deposited molybdenum as a material, it is possible to obtain the metal foil leading-in wire 4 that has an increased surface area due to fine irregularities on the surface, i.e., a satin finish 4a, as in the case of a sand blasting.
- the molybdenum electrode on an anode side is in the state of (Mo ⁇ Mo 5+ +5e - ), i.e., a state where electrical corrosion has been caused, thereby producing fine irregularities in the same manner. It is therefore possible to use as a material of a metal foil leading-in wire 4 that has a great surface area as in that of the cathode. It should be noted that no abrasive grain is required in this manner and thus requires no step of eliminating remaining abrasive grains.
- test samples of the satin finish 4a having a different surface roughness were prepared and their surface roughnesses were measured according to JIS B0601(1982) standards, in order to obtain an optimum range of surface roughness.
- Ra arithmetical mean deviation of profile
- Rz ten point height of irregularities
- the arithmetical means deviation of profile is defined as 0.25 ⁇ Ra ⁇ 0.8( ⁇ m) and the ten point height of irregularities is defined as 1.1 ⁇ Rz ⁇ 4.5( ⁇ m).
- metal halide discharge lamps of the present invention that suppress a reduction in life time due to repetitive lighting and lighting-off, are extremely useful because in recent years, metal halide discharge lamps have been finding their ways into uses where lighting and lighting-off are more frequent than that of conventional lamps for lighting, e.g., head lamps for automobiles, light sources for projection type television receiving sets.
Abstract
A metal halide discharge lamp 1 in which a metal
foil leading-in wire 4 being held and sealed by a bulb 2 has
at least one surface provided with a satin finish 4a, reduces
the influence due to repetitive lighting and lighting-off to
avoid an extreme short lift time.
Description
The present invention relates to a discharge lamp
and, in particular, a discharge lamp in which metal halide is
added into mercury vapor for improving color rendering
property.
FIG. 3 shows a construction of a metal halide
discharge lamp of prior art. At the time of feeding from the
exterior to a discharging electrode 92 disposed in a
discharge room 91a of a bulb 91, in order to maintain the
gastightness of the discharge room 91a, a metal foil
leading-in wire 93 made of molybdenum etc. is held and sealed
by thermally deforming the bulb 91.
The use of the metallic foil leading-in wire
permits an increase of surface area as a conductive material
and a reduction in pressure of the discharge room 91a per
unit area. However, since the bulb in the softened state is
subjected to pressure welding with the metal foil leading-in
wire, both are merely in contact with a flat surface as shown
in FIG. 4. By thermal stresses of temperature rise and fall
due to the repetitive lighting and lighting-off, a contact
between the two becomes gradually loose, leading to leaks.
Japanese Patent Publication No. Hei. 5-3703
describes a construction where sealing is performed by
deposing a conductive material of round bar on a bulb by
using a frit. However, the use of a round bar shaped
conductive material displays a disadvantage that the ratio of
the surface area to the volume, i.e., the ratio of the
periphery to the sectional area, becomes small. Since the
sectional area requires a specified value according to the
discharge current value, if the periphery length is small for
the same sectional area, the pressure of a discharge room
applied per unit length is increased. Accordingly, for the
whole conductive material, the pressure of the discharge room
per unit area is increased, which is disadvantageous in
preventing leaks.
As described, although a frit is interposed for
increasing the adhesive strength between a bulb and a
conductive material, the frit is melted at the time of
sealing to deposit on the bulb and the conductive material.
Therefore, at this melting, impurities contained in the frit
or the composition of the frit evaporate and then enter the
discharge room to damage discharge lamp properties.
The above mentioned problems are solved according
to the present invention by a metal halide discharge lamp
comprising a metal foil leading-in wire held and sealed by a
thermally deformed glass bulb, characterized in that at least
one of surfaces of the metal foil leading-in wire are
furnished with a satin finish.
The metal halide discharge lamp including the
metallic foil leading-in wire with the satin finished both
surfaces that is held and sealed by a bulb is free from the
problem of prior art that the lift time of halide discharge
lamps is reduced depending upon the number of lighting and
lighting-off. It is therefore possible to apply to cases
where flickering is made frequently, e.g., head lamps of
automobiles, to expand the use of metal halide discharge
lamps of this type, and to improve the reliability.
In addition, the satin finish by a sand blasting
finish using corundum abrasive grains or an electric field
deposition using a melted metallic salt, prevents matters
which will be harmful by heating for sealing with a bulb from
entering the discharge room. This avoids an additional step,
e.g., elimination of remaining abrasive grains, and
facilitates to practice the discharge lamp of the present
invention, without causing no cost rise.
Other features and advantages of the present
invention will be apparent from the following description
taken in connection with the accompanying drawings.
FIG. 1 is a sectional view of a metal halide
discharge lamp according to a preferred embodiment of the
present invention.
FIG. 2 is a sectional view along line A-A of FIG.
1.
FIG. 3 is a sectional view of a metal halide
discharge lamp of prior art.
FIG. 4 is a sectional view along line B-B of FIG.
3.
With reference to FIG. 1, reference numeral 1
indicates a metal halide discharge lamp according to one
embodiment of the present invention. In the metal halide
discharge lamp 1, a metal foil leading-in wire 4 made of
molybdenum is employed as a conductive material so as to
produce a greater surface area for sectional area, in order
that the gastightness of a discharge room 2a is maintained
when performing a feeding from the exterior to a discharging
electrode 3 disposed in the discharge room 2a of a bulb 2.
Detailed description of the metal foil leading-in
wire 4 is given herebelow. Metal materials as a material of
the metal foil leading-in wire 4 are supplied in the market
after they are formed, e.g., by means of rolling, into the
form of foil (plate) by manufacturers so as to have a
specified thickness, and further treated to have a fairly
smooth surface, i.e., flaw-free, for increasing their
commercial value.
Therefore, if the metal foil leading-in wire 4 is
formed by such a commercially available metal material, it is
impossible to obtain a peripheral length greater than that
defined by its sectional shape. Hence, the present invention
is directed to obtain a peripheral length greater than that
defined by the sectional shape of a metal foil leading-in
wire 4 by providing a satin finish 4a on at least one of the
surfaces of the aforesaid metal material to produce fine
irregularities thereon, as shown in FIG. 2.
Detailed description of the satin finish 4a is
given herebelow. As a first means, there is a manner
executed by mechanical means, such as sand blasting, in which
abrasive grains that are fine powders of a material having an
appropriate hardness are sprayed and collided on the surface
of a metal foil leading-in wire 4 or of a metal material that
is a material to form the metal foil leading-in wire 4.
As abrasive grains of this type, silicon carbide
(SiC), hereinafter referred to as carborundum, is generally
employed because of its outstanding work efficiency in
addition to its hardness. However, from the test and
examination conducted by the present inventors, it has been
found out that the abrasive grains of silicon carbide have
the following disadvantages.
Specifically, since the abrasive grains of silicon
carbide have high hardness, they are strongly cut into the
metal foil leading-in wire 4. It is therefore very difficult
to eliminate the remaining abrasive grains on the surface
after a sand blasting. The remaining abrasive grains sublime
at the step of sealing, adhere to a discharging electrode 3
and disappear, which will then make the surface black.
On the other hand, alumina (Al2O3), hereinafter
referred to as corundum, is not decomposed at temperatures
required in a sealing step, i.e., about 2000°C, thus causing
no influence on the life time of discharge lamps. Therefore,
the present invention employs alumina as an abrasive grain.
This avoids a step of eliminating such remaining abrasive
grains as described above to reduce the number of steps as a
whole.
As a second means for forming a satin finish 4a,
there is chemical means, such as an electric field deposition
using a melted metallic salt. The following description is
made taking an example of molybdenum but not limited to this
alone. Other metals or metal mixtures are useable for the
metal foil leading-in wire 4.
Generally, it is impossible to execute an electric
field deposition from an aqueous solution with a metal, e.g.,
molybdenum, whose ionization tendency is greater than that of
hydrogen (H). Because the melting point of molybdenum is
2893 K, an electric field deposition in the solution state
requires high equipment and technical levels, making it
further difficult to apply it into practice.
The use of molybdenum chloride (MoCl5) having a low
melting point permits an easy practical application.
Specifically, molybdenum chloride is melted in a crucible
under an argon atmosphere and then subjected to an electric
field deposition by using molybdenum as an electrode.
In this occasion, the molybdenum is deposited in a
manner of (Mo5++5e-→Mo) on a cathode side, and therefore, by
forming a metal foil lead-in wire 4 with this deposited
molybdenum as a material, it is possible to obtain the metal
foil leading-in wire 4 that has an increased surface area due
to fine irregularities on the surface, i.e., a satin finish
4a, as in the case of a sand blasting.
At the same time, the molybdenum electrode on an
anode side is in the state of (Mo→Mo5++5e-), i.e., a state
where electrical corrosion has been caused, thereby producing
fine irregularities in the same manner. It is therefore
possible to use as a material of a metal foil leading-in wire
4 that has a great surface area as in that of the cathode.
It should be noted that no abrasive grain is required in this
manner and thus requires no step of eliminating remaining
abrasive grains.
The test and examination for the satin finish 4a
conducted by the present inventors show that to improve the
adhesive strength with a bulb 2, it is effective to set the
surface roughness in a proper range. Test samples of the
satin finish 4a having a different surface roughness were
prepared and their surface roughnesses were measured
according to JIS B0601(1982) standards, in order to obtain an
optimum range of surface roughness.
In the following description, arithmetical mean
deviation of profile is referred to as "Ra", and ten point
height of irregularities is referred to as "Rz". For fifty
samples of satin finish 4a having a surface roughness of
Ra=0.2 µm and Rz=1.1 µm, 60% of the samples peeled off a bulb
2. This shows that the surface is too smooth to improve the
adhesive strength. The length measured at that time was 0.8 mm.
Next, with Ra<0.25µm and 1.1µm<Rz, samples of satin
finish 4a were prepared to conduct the test under the same
conditions. The result was 0%, i.e., no sample peeled off a
bulb 2, which satisfied the above object. The mean interval
(Sm) of the counted irregularities not less than ±1 µm in
mean line was Sm≤40µm.
It is extremely difficult to obtain Ra>0.5µm,
Rz>4.5µm by means of sand blasting or electric field
deposition as previously described. But even if failed to
reach these values, it is possible to determine whether a
satisfactory effect for the object is obtained or not. Thus,
in the present invention, the arithmetical means deviation of
profile is defined as 0.25≤Ra≤0.8(µm) and the ten point
height of irregularities is defined as 1.1<Rz≤4.5(µm).
Operation and effect of the metal halide discharge
lamp 1 with the above mentioned construction is described
herebelow. The increase of surface area of the metal foil
leading-in wire 4 by the presence of the satin finish 4a
enables to extend the life time of the discharge lamp 1 by
suppressing that a contact with the bulb 2 is loosen by
thermal stresses due to repetitive lighting and lighting-out
to allow the outside air to enter the discharge room 2a.
According to the test results, when a conventional
molybdenum foil with a smooth surface is employed as a metal
foil leading-in wire 4, on the average 2,000 repetitions of
lighting and lighting-off caused peeling between a bulb 2 and
the metal foil leading-in wire 4 to cause leaks. On the
other hand, when used a metal foil leading-in wire 4 of the
present invention, on the average 12,000 repetition of
lighting and lighting-off caused a gradual leak. This shows
about six times improvement.
In this manner, the metal halide discharge lamps of
the present invention that suppress a reduction in life time
due to repetitive lighting and lighting-off, are extremely
useful because in recent years, metal halide discharge lamps
have been finding their ways into uses where lighting and
lighting-off are more frequent than that of conventional
lamps for lighting, e.g., head lamps for automobiles, light
sources for projection type television receiving sets.
While there has been described what is at present
considered to be a preferred embodiment of the invention, it
will be understood that various modifications may be made
thereto, and it is intended that the appended claims cover
all such modifications as fall within the true spirit and
scope of the invention.
Claims (10)
- A metal halide discharge lamp comprising a metal foil leading-in wire held and sealed by a thermally deformed glass bulb, characterized in that at least one of surfaces of the metallic foil leading-in wire is furnished with a satin finish.
- The metal halide discharge lamp as set forth in claim 1, wherein both surfaces of the metallic foil leading-in wire are furnished with a satin finish.
- The metal halide discharge lamp as set forth in claim 1, wherein the satin finish is performed by a sand blasting finish using corundum abrasive grains.
- The metal halide discharge lamp as set forth in claim 1, wherein the satin finish is performed by an electric field deposition using a melted metallic salt.
- The metal halide discharge lamp as set forth in claim 2, wherein the satin finish is performed by a sand blasting finish using corundum abrasive grains.
- The metal halide discharge lamp as set forth in claim 2, wherein the satin finish is performed by an electric field deposition using a melted metallic salt.
- The metal halide discharge lamp as set forth in claim 1, wherein a surface roughness of the satin finish is defined as 0.25≤Ra≤0.8 (µm), 1.1<Rz≤4.5 (µm), and Sm≤40 (µm) according to JIS B0601 (1982), where Ra represents arithmetical mean deviation of profile, Rz represents ten point height of irregularities, and Sm represents mean interval of irregularities.
- The metal halide discharge lamp as set forth in claim 3, wherein a surface roughness of the satin finish is defined as 0.25≤Ra≤0.8 (µm), 1.1<Rz≤4.5 (µm), and Sm≤40 (µm) according to JIS B0601 (1982), where Ra represents arithmetical mean deviation of profile, Rz represents ten point height of irregularities, and Sm represents mean interval of irregularities.
- The metal halide discharge lamp as set forth in claim 4, wherein a surface roughness of the satin finish is defined as 0.25≤Ra≤0.8 (µm), 1.1<Rz≤4.5 (µm), and Sm≤40 (µm) according to JIS B0601 (1982), where Ra represents arithmetical mean deviation of profile, Rz represents ten point height of irregularities, and Sm represents mean interval of irregularities.
- The metal halide discharge lamp as set forth in one of the claims 1 to 9, wherein the metal foil leading-in wire is a molybdenum foil.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP09385697A JP3150918B2 (en) | 1996-08-16 | 1997-04-11 | Metal halide discharge lamp |
| JP93856/97 | 1997-04-11 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0871202A2 true EP0871202A2 (en) | 1998-10-14 |
| EP0871202A3 EP0871202A3 (en) | 1999-02-10 |
Family
ID=14094075
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP98104337A Withdrawn EP0871202A3 (en) | 1997-04-11 | 1998-03-11 | Metal halide discharge lamp |
Country Status (1)
| Country | Link |
|---|---|
| EP (1) | EP0871202A3 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2338823A (en) * | 1998-06-26 | 1999-12-29 | Koito Mfg Co Ltd | Arc tube and fabricating method thereof |
| NL1015467C2 (en) * | 1999-06-25 | 2001-05-04 | Koito Mfg Co Ltd | Arc tube and manufacturing method therefor. |
| EP1156505A1 (en) * | 2000-05-18 | 2001-11-21 | PLANSEE Aktiengesellschaft | Process of producing an electrical lamp |
| DE10031182B4 (en) * | 1999-06-28 | 2007-11-22 | Koito Manufacturing Co., Ltd. | An arc discharge tube with residual compressive stress layer for a discharge lamp unit and method of manufacturing the same |
| EP1981061A1 (en) * | 2006-01-26 | 2008-10-15 | Harison Toshiba Lighting Corporation | Metal halide lamp |
| DE102007020067A1 (en) * | 2007-04-27 | 2008-11-06 | Osram Gesellschaft mit beschränkter Haftung | Process for producing a molybdenum foil for lamp construction and molybdenum foil and lamp with molybdenum foil |
| EP2086002A2 (en) | 2004-09-30 | 2009-08-05 | Koninklijke Philips Electronics N.V. | Electric lamp with sealing foil |
| DE10241398B4 (en) * | 2001-09-07 | 2013-06-13 | Koito Manufacturing Co., Ltd. | Method for producing an arc tube for a discharge lamp |
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| US4587454A (en) * | 1984-05-17 | 1986-05-06 | Gte Products Corporation | Incandescent lamp with improved press seal |
-
1998
- 1998-03-11 EP EP98104337A patent/EP0871202A3/en not_active Withdrawn
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| US2227511A (en) * | 1937-08-30 | 1941-01-07 | Thermal Syndicate Ltd | Seal and method of making the same |
| GB780614A (en) * | 1955-02-23 | 1957-08-07 | British Thomson Houston Co Ltd | Quartz-to-metal seals |
| JPS5964548A (en) * | 1982-09-30 | 1984-04-12 | Toshiba Corp | Sealing member |
| US4587454A (en) * | 1984-05-17 | 1986-05-06 | Gte Products Corporation | Incandescent lamp with improved press seal |
Non-Patent Citations (1)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN vol. 008, no. 162 (C-235), 26 July 1984 & JP 59 064548 A (TOSHIBA KK), 12 April 1984 * |
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| DE19928996B4 (en) * | 1998-06-26 | 2009-04-02 | Koito Mfg. Co., Ltd. | Method for producing an arc tube |
| GB2338823B (en) * | 1998-06-26 | 2001-06-13 | Koito Mfg Co Ltd | Method of fabricating an arc tube |
| US6354900B1 (en) | 1998-06-26 | 2002-03-12 | Koito Manufacturing Co., Ltd. | Arc tube and fabricating method thereof |
| NL1012447C2 (en) * | 1998-06-26 | 2004-08-19 | Koito Mfg Co Ltd | Arc tube and method for manufacturing it. |
| GB2338823A (en) * | 1998-06-26 | 1999-12-29 | Koito Mfg Co Ltd | Arc tube and fabricating method thereof |
| NL1015467C2 (en) * | 1999-06-25 | 2001-05-04 | Koito Mfg Co Ltd | Arc tube and manufacturing method therefor. |
| US6891332B1 (en) | 1999-06-25 | 2005-05-10 | Koito Manufacturing Co., Ltd. | Arc tube capable of preventing occurrence of leak due to cracks and manufacturing method therefore |
| DE10030808B4 (en) * | 1999-06-25 | 2006-03-23 | Koito Mfg. Co., Ltd. | Arc discharge tube and method of making the same |
| DE10031182B4 (en) * | 1999-06-28 | 2007-11-22 | Koito Manufacturing Co., Ltd. | An arc discharge tube with residual compressive stress layer for a discharge lamp unit and method of manufacturing the same |
| EP1156505A1 (en) * | 2000-05-18 | 2001-11-21 | PLANSEE Aktiengesellschaft | Process of producing an electrical lamp |
| US6753650B2 (en) | 2000-05-18 | 2004-06-22 | Plansee Aktiengesellschaft | Method for producing an electric lamp and foil configuration |
| DE10241398B4 (en) * | 2001-09-07 | 2013-06-13 | Koito Manufacturing Co., Ltd. | Method for producing an arc tube for a discharge lamp |
| US7888872B2 (en) | 2004-09-30 | 2011-02-15 | Koninklijke Philips Electronics N.V. | Electric lamp |
| EP2086002A2 (en) | 2004-09-30 | 2009-08-05 | Koninklijke Philips Electronics N.V. | Electric lamp with sealing foil |
| EP2107595A2 (en) | 2004-09-30 | 2009-10-07 | Koninklijke Philips Electronics N.V. | Electric lamp and metal foil |
| EP1981061A4 (en) * | 2006-01-26 | 2010-06-16 | Harison Toshiba Lighting Corp | Metal halide lamp |
| US8203271B2 (en) | 2006-01-26 | 2012-06-19 | Harison Toshiba Lighting Corporation | Metal halide lamp including sealed metal foil |
| EP1981061A1 (en) * | 2006-01-26 | 2008-10-15 | Harison Toshiba Lighting Corporation | Metal halide lamp |
| WO2008132123A2 (en) | 2007-04-27 | 2008-11-06 | Osram Gesellschaft mit beschränkter Haftung | Method for producing a molybdenum film for the construction of a lamp and molybdenum film and lamp with molybdenum film |
| WO2008132123A3 (en) * | 2007-04-27 | 2009-04-16 | Osram Gmbh | Method for producing a molybdenum film for the construction of a lamp and molybdenum film and lamp with molybdenum film |
| DE102007020067A1 (en) * | 2007-04-27 | 2008-11-06 | Osram Gesellschaft mit beschränkter Haftung | Process for producing a molybdenum foil for lamp construction and molybdenum foil and lamp with molybdenum foil |
| US8408961B2 (en) | 2007-04-27 | 2013-04-02 | Osram Gesellschaft Mit Beschraenkter Haftung | Method for producing a molybdenum film for the construction of a lamp and molybdenum film and lamp with molybdenum film |
| DE102007020067B4 (en) * | 2007-04-27 | 2013-07-18 | Osram Gmbh | Process for producing a molybdenum foil for lamp construction and molybdenum foil and lamp with molybdenum foil |
| CN101663729B (en) * | 2007-04-27 | 2014-07-09 | 奥斯兰姆有限公司 | Method for producing a molybdenum film for the construction of a lamp and molybdenum film and lamp with molybdenum film |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0871202A3 (en) | 1999-02-10 |
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