EP0431697B1 - Hochdruckentladungslampe - Google Patents
Hochdruckentladungslampe Download PDFInfo
- Publication number
- EP0431697B1 EP0431697B1 EP19900203184 EP90203184A EP0431697B1 EP 0431697 B1 EP0431697 B1 EP 0431697B1 EP 19900203184 EP19900203184 EP 19900203184 EP 90203184 A EP90203184 A EP 90203184A EP 0431697 B1 EP0431697 B1 EP 0431697B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- lamp
- capacitor
- voltage
- gas
- pressure discharge
- 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
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/56—One or more circuit elements structurally associated with the lamp
Definitions
- the invention relates to a high-pressure discharge lamp comprising a discharge vessel, an outer bulb enclosing said discharge vessel with intervening space and having a lamp cap, and an ignition circuit within said lamp comprising a voltage-dependent capacitor.
- a lamp of the type described in the opening paragraph is known from German Patent DE-C-3330266.
- the capacitor is positioned in the outer bulb and provided with a glass envelope to protect it against reduction and evaporation of parts of the capacitor.
- Practice has shown, however, that this entails major disadvantages.
- manufacture of a capacitor provided with such an envelope is very difficult, which makes the capacitor very expensive.
- the known lamp turns out to have a high degree of early failures owing to capacitor breakdown.
- the invention has for its object to provide a means by which the disadvantages described above are obviated, while the ignition circuit is still mounted in the lamp.
- this object is achieved in a lamp of the type described in the opening paragraph in that the lamp is characterized in that the capacitor is mounted in a gas-filled gas-tight glass capsule in the lamp cap.
- the advantage of this is that the capacitor is enclosed in a glass housing by means of a technology which has long been known and proved to be suitable, so that production is simple and reliable, which leads consequently to cost reduction in comparison with the known lamp.
- the gas pressure ensures that dissociation and/or evaporation of components from which the capacitor is built up is counteracted. Gas composition is so chosen that no reactions with capacitor components takes place under the prevailing conditions during lamp operation. Suitable gases are, for instance, rare gases, nitrogen, oxygen and sulphurhexafluoride.
- the gas filling may consist of a single gas, but combinations of gases are also possible.
- Mounting in the lamp cap has the additional advantage that the capacitor is mounted at a comparatively great distance from the discharge vessel, so that heating of the capacitor in the operational state of the lamp remains restricted.
- the use of a glass capsule has the further advantage that the lamp according to the invention can also be used in places where a more or less aggressive atmosphere prevails without extra measures having to be taken.
- a further improvement of the lamp can be achieved in that the gas-tight glass capsule is provided with a radiation reflecting layer.
- the radiation reflecting layer may be applied either externally or internally.
- a voltage-dependent resistor is connected in series with the capacitor.
- a further improvement is possible in providing the ignition circuit also with a fuse.
- a lamp 2 according to the invention is provided with a discharge vessel 3, which is enclosed with intervening space by an outer bulb 30, which is provided with a lamp cap 31, lamp 2 also comprising an ignition circuit 10 (Fig. 2) mounted in the lamp cap 31, which circuit comprises a voltage-dependent capacitor 8.
- the voltage-dependent capacitor 8 is mounted in a gas-filled gas-tight glass capsule 11.
- the discharge vessel 3 is provided with lamp electrodes 4 and 5, between which a discharge takes place in the operational state of the lamp.
- Lamp electrode 4 is connected to a lamp contact C of lamp cap 31 via a rigid current conductor 40.
- lamp electrode 5 is connected to a lamp contact D of lamp cap 31 via a rigid conductor 50.
- the starting circuit 10 is also provided with a fuse 7 and a voltage-dependent resistor 9, both of which are also mounted in the lamp cap.
- a and B are connection terminals for connecting an AC voltage supply source.
- Terminal A is connected to lamp contact C via a stabilizing ballast 1.
- Terminal B is connected to lamp contact D.
- the ignition circuit 10 formed by the circuit consisting of fuse 7, voltage-dependent capacitor 8 and voltage-dependent resistor 9, together with stabilizing ballast 1 generates in known manner ignition voltage pulses between the lamp contacts C and D and thus between the lamp electrodes 4 and 5.
- the discharge vessel 3 may be provided with an external auxiliary electrode as a further ignition aid.
Landscapes
- Discharge Lamps And Accessories Thereof (AREA)
- Circuit Arrangements For Discharge Lamps (AREA)
Claims (3)
- Hochdruckentladungslampe mit einem Entladungsgefäß, einem Außenkolben mit diesem Entladungsgefäß mit Zwischenraum und mit einem Lampensockel, und einem Zündkreis in der Lampe mit einem spannungsabhängigen Kondensator, dadurch gekennzeichnet, daß der Kondensator im Lampensockel in einer gasgefüllten gasdichten Glaskapsel angeordnet ist.
- Lampe nach Anspruch 1, dadurch gekennzeichnet, daß die Glaskapsel mit einer Strahlung reflektierenden Schicht versehen ist.
- Lampe nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß ein spannungsabhängiger Widerstand mit dem Kondensator in Reihe geschaltet ist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL8903000 | 1989-12-06 | ||
NL8903000A NL8903000A (nl) | 1989-12-06 | 1989-12-06 | Hogedrukontladingslamp. |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0431697A1 EP0431697A1 (de) | 1991-06-12 |
EP0431697B1 true EP0431697B1 (de) | 1994-11-09 |
Family
ID=19855750
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19900203184 Expired - Lifetime EP0431697B1 (de) | 1989-12-06 | 1990-12-03 | Hochdruckentladungslampe |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0431697B1 (de) |
JP (1) | JPH03250556A (de) |
DE (1) | DE69014080T2 (de) |
HU (1) | HU204627B (de) |
NL (1) | NL8903000A (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4967589A (en) * | 1987-12-23 | 1990-11-06 | Ricoh Company, Ltd. | Gas detecting device |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3629647A (en) * | 1970-07-15 | 1971-12-21 | Gen Electric | Voltage doubler starting circuit for discharge lamp |
JPS5935354A (ja) * | 1982-08-23 | 1984-02-27 | Iwasaki Electric Co Ltd | 高圧金属蒸気放電灯 |
-
1989
- 1989-12-06 NL NL8903000A patent/NL8903000A/nl not_active Application Discontinuation
-
1990
- 1990-12-03 EP EP19900203184 patent/EP0431697B1/de not_active Expired - Lifetime
- 1990-12-03 HU HU803490A patent/HU204627B/hu unknown
- 1990-12-03 DE DE1990614080 patent/DE69014080T2/de not_active Expired - Fee Related
- 1990-12-04 JP JP40400090A patent/JPH03250556A/ja active Pending
Also Published As
Publication number | Publication date |
---|---|
DE69014080D1 (de) | 1994-12-15 |
HU204627B (en) | 1992-01-28 |
DE69014080T2 (de) | 1995-05-24 |
HUT55938A (en) | 1991-06-28 |
JPH03250556A (ja) | 1991-11-08 |
EP0431697A1 (de) | 1991-06-12 |
NL8903000A (nl) | 1991-07-01 |
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