CA1157904A - Sodium vapour discharge lamp with xenon absorbent in a wall cavity - Google Patents
Sodium vapour discharge lamp with xenon absorbent in a wall cavityInfo
- Publication number
- CA1157904A CA1157904A CA000350079A CA350079A CA1157904A CA 1157904 A CA1157904 A CA 1157904A CA 000350079 A CA000350079 A CA 000350079A CA 350079 A CA350079 A CA 350079A CA 1157904 A CA1157904 A CA 1157904A
- Authority
- CA
- Canada
- Prior art keywords
- absorbent
- xenon
- lamp
- discharge lamp
- cavity
- 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
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
- H01J61/24—Means for obtaining or maintaining the desired pressure within the vessel
- H01J61/28—Means for producing, introducing, or replenishing gas or vapour during operation of the lamp
Landscapes
- Discharge Lamp (AREA)
- Vessels And Coating Films For Discharge Lamps (AREA)
- External Artificial Organs (AREA)
Abstract
ABSTRACT:
The invention relates to a high-pressure sodium vapour discharge lamp having a discharge vessel in which xenon and an absorbent are present. The xenon is partly absorbed in the absorbent. When the temperature is raised xenon is released. Both for starting the lamp and for the operating condition a suitable xenon pressure can be real-ised. According to the invention the absorbent is present in a cavity which is present in the wall of the discharge vessel. Herewith a simple place for storing the absorbent is obtained.
The invention relates to a high-pressure sodium vapour discharge lamp having a discharge vessel in which xenon and an absorbent are present. The xenon is partly absorbed in the absorbent. When the temperature is raised xenon is released. Both for starting the lamp and for the operating condition a suitable xenon pressure can be real-ised. According to the invention the absorbent is present in a cavity which is present in the wall of the discharge vessel. Herewith a simple place for storing the absorbent is obtained.
Description
1 1~7~
PHN 9~136 The invention relates to a discharge lamp compris-ing a discharge vessel in which xenon and an absorbent which is in contact with the xenon are present, the xenon being absorbed at least partly in the absorbent and being releas-ed partly from the said absorbent when -the temperature is ~ raised.
Such a lamp is disclosed in British Patent Specifi-cation 669,o33. The xenon pressure in the operating condi-tion of the lamp described lies in such a range that a light source having a comparatively large light output can be realised with it. In the inoperative condition of the lamp the xenon pressure is reduced by means o~ the absor-bent. In this known lamp the absorbent is provided in a holder around the electrode rod. A construction as used in this known lamp requires the use of` a long electrode rod. This may be a disadvantage. It is the object of the invention to provide a construction in which the said disadvantage is removed or at least mitigated.
According to the invention, a lamp of the kind 20 mentioned in the opening paragraph is characterized in that the absorbent is present in a cavity in the wall of the dis~harge vessel.
The lamp according to the invention has the advan-tage tha-t the presence of the absorbent is independent of 25 electrode rods, and is based on the recognition of the fact that the wall of the discharge vessel is a suitable place for storing the absorbent.
It is feasible that the cavity, in the form of a separate ~ppendix of` the discharge vessel, may be enclosed 30 by -the wall of the discharge vessel. Ilowever, a lamp in accordance with the inven-tion preferably comprises at least one lead--through for a current supply member to an internal electrode and the ca-vity is present at the area of the ~ 1S7gO~
lead-through. The advantage of this lamp is that space is obtained for the location of the absorbent by means of a simple construction.
In a further preferred lamp in accordance with the inven-tion the lead-through is a metal cup which is located in the cavity, which cup tightly ~ -s substantially throughout its length against the wall enclosing the cavity, said cup being gas-permeable on a side facing the electrode.
The advantage of this lamp is that the absorbent is in a lO favourable place from a point of view of light-technology.
The wall of the discharge vessel consists, for example, of quartz glass or a ceramic material. In a fur-ther advantageous embodiment of a lamp in accordance with the invention -the lamp of the discharge vessel mainly con-lS sists of densely sintered aluminium oxide. Such a lamp has for its advantage that the wall of the discharge vessel is a good heat conductor. ~s a result of this it is achieved that the absorbent rapidly assumes a sufficiently high temperature.
The absorbent may comprise one or more materials, for example, fine-granular oxides, carbides, borides and metals. In an improved embodiment of a lamp in accordance with the invention the absorbent is mainly carbon. This lamp thus has a material wi-th good absorption properties, 25 which is advantageous.
~ lamp in accordance with the inven-tion ma~ be, for example, a low-pressure discharge lamp or a high-pressure mercury vapour discharge lamp. ~ccording to an im-proved preferred embodiment of a lamp in accordance with 30 the inventio-n, however, the lam-p is a high-pressure soclium -vapour discharge lamp. The advan-tage of this lamp is a high luminous flux and good ignition proper-ties.
The invention will now be described in greater detail wi-th re:terence to a drawing. tn the drawing ~ig. 1 is a side elevation, partly broken away, of a lamp in accordance with -the invention, and I!ig. 2 is a sectional vie~ of a detail of a lead-through construction of the larnp shown in ~ig. 1.
1 15790~
Reference numeral l in Fig. l denotes a discharge vessel the wall of which consists of densi.ty sintered alu-minium oxide which is enclosed by an envelope 2 having a lamp cap 3. The discharge vessel 1 has two internal main electrodes 4 and 5 between which the discharge is maintained in the operating condition of -the lamp. Main electrode 4 is connected to a metal strip 7 via a leadthrough 6. This strip 7 is connected to pole wire 8 which is connected to a con-tact of the lamp cap 3. An extended portion 9 of the pole wire 8 serves to support and centre the discharge vessel 1 in the envelope 2. The main electrode 5 is connec-ted to a strip-shaped conductor 13 by means of a leadthrough con-sisting of a tubular cup 10 and a rod 12. The other end of said conductor 13 is connected to another contact in the lS lamp cap 3. The cup 10 fi;ts tightly in the cavity 35 (Fig.
PHN 9~136 The invention relates to a discharge lamp compris-ing a discharge vessel in which xenon and an absorbent which is in contact with the xenon are present, the xenon being absorbed at least partly in the absorbent and being releas-ed partly from the said absorbent when -the temperature is ~ raised.
Such a lamp is disclosed in British Patent Specifi-cation 669,o33. The xenon pressure in the operating condi-tion of the lamp described lies in such a range that a light source having a comparatively large light output can be realised with it. In the inoperative condition of the lamp the xenon pressure is reduced by means o~ the absor-bent. In this known lamp the absorbent is provided in a holder around the electrode rod. A construction as used in this known lamp requires the use of` a long electrode rod. This may be a disadvantage. It is the object of the invention to provide a construction in which the said disadvantage is removed or at least mitigated.
According to the invention, a lamp of the kind 20 mentioned in the opening paragraph is characterized in that the absorbent is present in a cavity in the wall of the dis~harge vessel.
The lamp according to the invention has the advan-tage tha-t the presence of the absorbent is independent of 25 electrode rods, and is based on the recognition of the fact that the wall of the discharge vessel is a suitable place for storing the absorbent.
It is feasible that the cavity, in the form of a separate ~ppendix of` the discharge vessel, may be enclosed 30 by -the wall of the discharge vessel. Ilowever, a lamp in accordance with the inven-tion preferably comprises at least one lead--through for a current supply member to an internal electrode and the ca-vity is present at the area of the ~ 1S7gO~
lead-through. The advantage of this lamp is that space is obtained for the location of the absorbent by means of a simple construction.
In a further preferred lamp in accordance with the inven-tion the lead-through is a metal cup which is located in the cavity, which cup tightly ~ -s substantially throughout its length against the wall enclosing the cavity, said cup being gas-permeable on a side facing the electrode.
The advantage of this lamp is that the absorbent is in a lO favourable place from a point of view of light-technology.
The wall of the discharge vessel consists, for example, of quartz glass or a ceramic material. In a fur-ther advantageous embodiment of a lamp in accordance with the invention -the lamp of the discharge vessel mainly con-lS sists of densely sintered aluminium oxide. Such a lamp has for its advantage that the wall of the discharge vessel is a good heat conductor. ~s a result of this it is achieved that the absorbent rapidly assumes a sufficiently high temperature.
The absorbent may comprise one or more materials, for example, fine-granular oxides, carbides, borides and metals. In an improved embodiment of a lamp in accordance with the invention the absorbent is mainly carbon. This lamp thus has a material wi-th good absorption properties, 25 which is advantageous.
~ lamp in accordance with the inven-tion ma~ be, for example, a low-pressure discharge lamp or a high-pressure mercury vapour discharge lamp. ~ccording to an im-proved preferred embodiment of a lamp in accordance with 30 the inventio-n, however, the lam-p is a high-pressure soclium -vapour discharge lamp. The advan-tage of this lamp is a high luminous flux and good ignition proper-ties.
The invention will now be described in greater detail wi-th re:terence to a drawing. tn the drawing ~ig. 1 is a side elevation, partly broken away, of a lamp in accordance with -the invention, and I!ig. 2 is a sectional vie~ of a detail of a lead-through construction of the larnp shown in ~ig. 1.
1 15790~
Reference numeral l in Fig. l denotes a discharge vessel the wall of which consists of densi.ty sintered alu-minium oxide which is enclosed by an envelope 2 having a lamp cap 3. The discharge vessel 1 has two internal main electrodes 4 and 5 between which the discharge is maintained in the operating condition of -the lamp. Main electrode 4 is connected to a metal strip 7 via a leadthrough 6. This strip 7 is connected to pole wire 8 which is connected to a con-tact of the lamp cap 3. An extended portion 9 of the pole wire 8 serves to support and centre the discharge vessel 1 in the envelope 2. The main electrode 5 is connec-ted to a strip-shaped conductor 13 by means of a leadthrough con-sisting of a tubular cup 10 and a rod 12. The other end of said conductor 13 is connected to another contact in the lS lamp cap 3. The cup 10 fi;ts tightly in the cavity 35 (Fig.
2) in the vessel wall and is filled with carbon 11 .
Near its end where the tubular cup lO is pre.sent, the discharge vessel l is surrounded by a heat shield 25 extending the length of the cup. The heat shield preferably 20 consi.sts of tantalum.
The discharge vessel is provided with an ex-ternal auxiliary elec-trode 20. Near the main electrode 4 said auxi-liary electrode 20 is connec-ted to the s-trip 7 by a capaci-tor 23. At the other end of the discharge vessel the auxi-25 liary electrode 20 is connected to one end of an auxiliarymember 21 in the form of a tension spring. The other end of the auxiliary member 2 l is connected to the metal strip 13 by means of a conductive strip 22.
Reference numeral l in -l~ig~ 2 again denotes the dis-30 charge vessel of which is shown the part near the mainelectrode 5. The cup 10, whi.ch together with rod 12 consti.-tutes the leadthrough to -the electrode 5, consists of - niobium and fits -tightly in the cavity 35. Before being provided in the discharge vessel the cup 10 is successively 35 subjected to -the following operations. F`irst the absorbent 11 is placed in the cup. A number of sawcu-ts are then pro-vided in -the cup at ~ts open side, wh:ich cu-ts extend in the longi-tudinal d:i.rec-tion of -tlle a.~is of the cup and the 1 ~S790~
4 PH~ 9436 lengths of which are substantially half the diameter of the cup. The niobium strips lOa thus formed are then folded inwards and interconnected at their free ends to form a con-nection point. The main electrode 5 is connected to this connection point by means of an electrode rod 5a. Herewith it is achieved that the carbon can be reached by the xenon.
It is also possible for this niobium cup to be covered by means of a layer consisting of a porous metal.
The lamp described relates to a high-pressure sodium vapour discharge lamp having xenon as a buffer gas. The pressure of the xenon at 300 K is approximately 16 kPa. In the operating condition of the lamp in which the average temperature is approximately 2200 K, the xenon pressure is approximately 213 kPa. The niobium cup lO which has a dia-meter of 4 mm and a volume of approximately 75 mm3 contains45 mg of carbon. The lamp in question is suitable for being connected to a supply source of 220V, 50 Hz v a a stabili-sation ballast (not shown) of approximately 0.11 H. In addition to the stabilisation ballast, a starter (not shown) is incorporated in the connection to the supply source, which starter may, for example, be of the type described in our Canadian Patent 896,070 which issued on ~arch 21, 1972.
The power consumed by the lamp is ~00 W. The luminous flux is approximately 135 lm/W. The ignition voltage presented to the discharge vessel is approximately 3 kV.
The lamp of the above described embodiment has a discharge vessel the wall of which consists of density sin-tered aluminium oxide. The length of the discharge vessel is approximately 110 mm and the inside diameter is approxi-mately 7.5 mm. The distance between the two internal mainelectrodes of the discharge vessel is 82 mm, while the dis-tance from a main electrode to the nearest end of the dis-charge vessel is approximately 11 mm. The discharge vessel has a filling which in addition to xenon ccmprises 25 mg of amalgam, containing 27% by weight of sodium and 73% by weight of mercury. The lamp combines good ignition proper-ties and a high luminous flux with a favourable place for storing the absorbent.
Near its end where the tubular cup lO is pre.sent, the discharge vessel l is surrounded by a heat shield 25 extending the length of the cup. The heat shield preferably 20 consi.sts of tantalum.
The discharge vessel is provided with an ex-ternal auxiliary elec-trode 20. Near the main electrode 4 said auxi-liary electrode 20 is connec-ted to the s-trip 7 by a capaci-tor 23. At the other end of the discharge vessel the auxi-25 liary electrode 20 is connected to one end of an auxiliarymember 21 in the form of a tension spring. The other end of the auxiliary member 2 l is connected to the metal strip 13 by means of a conductive strip 22.
Reference numeral l in -l~ig~ 2 again denotes the dis-30 charge vessel of which is shown the part near the mainelectrode 5. The cup 10, whi.ch together with rod 12 consti.-tutes the leadthrough to -the electrode 5, consists of - niobium and fits -tightly in the cavity 35. Before being provided in the discharge vessel the cup 10 is successively 35 subjected to -the following operations. F`irst the absorbent 11 is placed in the cup. A number of sawcu-ts are then pro-vided in -the cup at ~ts open side, wh:ich cu-ts extend in the longi-tudinal d:i.rec-tion of -tlle a.~is of the cup and the 1 ~S790~
4 PH~ 9436 lengths of which are substantially half the diameter of the cup. The niobium strips lOa thus formed are then folded inwards and interconnected at their free ends to form a con-nection point. The main electrode 5 is connected to this connection point by means of an electrode rod 5a. Herewith it is achieved that the carbon can be reached by the xenon.
It is also possible for this niobium cup to be covered by means of a layer consisting of a porous metal.
The lamp described relates to a high-pressure sodium vapour discharge lamp having xenon as a buffer gas. The pressure of the xenon at 300 K is approximately 16 kPa. In the operating condition of the lamp in which the average temperature is approximately 2200 K, the xenon pressure is approximately 213 kPa. The niobium cup lO which has a dia-meter of 4 mm and a volume of approximately 75 mm3 contains45 mg of carbon. The lamp in question is suitable for being connected to a supply source of 220V, 50 Hz v a a stabili-sation ballast (not shown) of approximately 0.11 H. In addition to the stabilisation ballast, a starter (not shown) is incorporated in the connection to the supply source, which starter may, for example, be of the type described in our Canadian Patent 896,070 which issued on ~arch 21, 1972.
The power consumed by the lamp is ~00 W. The luminous flux is approximately 135 lm/W. The ignition voltage presented to the discharge vessel is approximately 3 kV.
The lamp of the above described embodiment has a discharge vessel the wall of which consists of density sin-tered aluminium oxide. The length of the discharge vessel is approximately 110 mm and the inside diameter is approxi-mately 7.5 mm. The distance between the two internal mainelectrodes of the discharge vessel is 82 mm, while the dis-tance from a main electrode to the nearest end of the dis-charge vessel is approximately 11 mm. The discharge vessel has a filling which in addition to xenon ccmprises 25 mg of amalgam, containing 27% by weight of sodium and 73% by weight of mercury. The lamp combines good ignition proper-ties and a high luminous flux with a favourable place for storing the absorbent.
Claims (6)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A discharge lamp comprising a discharge vessel in which xenon and an absorbent which is in contact with the xenon are present, the xenon being absorbed at least partly in the absorbent and being released partly from the said absorbent when the temperature is raised, characterized in that the absorbent is present in a cavity in the wall of the discharge vessel.
2. A discharge lamp as claimed in Claim 1, the dis-charge vessel of which comprises at least one leadthrough for a current supply member to an internal electrode, characterized in that the cavity is present at the areas of the leadthrough.
3. A discharge lamp as claimed in Claim 2, character-ized in that the leadthrough consists of a metal cup which is located in the cavity and that the cup tightly engages substantially throughout its length against the wall enclos-ing the cavity, the said cup being gas-permeable on a side facing the electrode.
4. A discharge lamp as claimed in Claim 1, 2 or 3, characterized in that the wall of the discharge vessel com-prises desnely sintered aluminium oxide.
5. A discharge lamp as claimed in Claim 1, 2 or 3, characterized in that the absorbent is mainly carbon.
6. A discharge lamp as claimed in Claim 1, 2 or 3, characterized in that the lamp is a high-pressure sodium vapour discharge lamp.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL7903286 | 1979-04-26 | ||
| NL7903286A NL7903286A (en) | 1979-04-26 | 1979-04-26 | Discharge tube. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1157904A true CA1157904A (en) | 1983-11-29 |
Family
ID=19833061
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000350079A Expired CA1157904A (en) | 1979-04-26 | 1980-04-17 | Sodium vapour discharge lamp with xenon absorbent in a wall cavity |
Country Status (9)
| Country | Link |
|---|---|
| JP (1) | JPS55144645A (en) |
| BE (1) | BE882972A (en) |
| CA (1) | CA1157904A (en) |
| DE (1) | DE3015504C2 (en) |
| FR (1) | FR2455358A1 (en) |
| GB (1) | GB2049271B (en) |
| HU (1) | HU184272B (en) |
| NL (1) | NL7903286A (en) |
| SE (1) | SE8003028L (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| HU202013B (en) * | 1985-07-02 | 1991-01-28 | Tungsram Reszvenytarsasag | Impulsed inert gas discharge lamp |
| RU2044366C1 (en) * | 1992-11-19 | 1995-09-20 | Акционерное общество "АСПОР" | Gaseous discharge lamp |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL35078C (en) * | 1930-04-02 | |||
| BE433316A (en) * | 1938-03-25 | |||
| FR1266181A (en) * | 1960-08-26 | 1961-07-07 | Lampes Sa | Clear alumina shell discharge lamps |
| FR81165E (en) * | 1962-02-09 | 1963-08-09 | Lampes Sa | Clear alumina shell discharge lamps |
| US3384798A (en) * | 1966-04-26 | 1968-05-21 | Gen Electric | High pressure saturation vapor sodium lamp containing mercury |
| JPS5041707U (en) * | 1973-08-17 | 1975-04-26 | ||
| US4035682A (en) * | 1976-08-26 | 1977-07-12 | General Electric Company | Universal burning alkali metal vapor lamp with amalgam storage in exhaust tubulation |
| NL177058C (en) * | 1977-04-15 | 1985-07-16 | Philips Nv | HIGH PRESSURE SODIUM VAPOR DISCHARGE LAMP. |
-
1979
- 1979-04-26 NL NL7903286A patent/NL7903286A/en not_active Application Discontinuation
-
1980
- 1980-04-17 CA CA000350079A patent/CA1157904A/en not_active Expired
- 1980-04-21 FR FR8008901A patent/FR2455358A1/en active Granted
- 1980-04-23 SE SE8003028A patent/SE8003028L/en not_active Application Discontinuation
- 1980-04-23 GB GB8013343A patent/GB2049271B/en not_active Expired
- 1980-04-23 DE DE19803015504 patent/DE3015504C2/en not_active Expired
- 1980-04-23 HU HU100980A patent/HU184272B/en unknown
- 1980-04-24 BE BE0/200371A patent/BE882972A/en not_active IP Right Cessation
- 1980-04-26 JP JP5491280A patent/JPS55144645A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| HU184272B (en) | 1984-07-30 |
| DE3015504C2 (en) | 1982-09-02 |
| NL7903286A (en) | 1980-10-28 |
| FR2455358A1 (en) | 1980-11-21 |
| GB2049271B (en) | 1983-02-16 |
| SE8003028L (en) | 1980-10-27 |
| BE882972A (en) | 1980-10-24 |
| GB2049271A (en) | 1980-12-17 |
| FR2455358B1 (en) | 1982-11-19 |
| JPS55144645A (en) | 1980-11-11 |
| DE3015504A1 (en) | 1980-10-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |