Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
  • H01J61/00—Gas-discharge or vapour-discharge lamps
  • H01J61/02—Details
  • H01J61/30—Vessels; Containers
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
  • H01J61/00—Gas-discharge or vapour-discharge lamps
  • H01J61/02—Details
  • H01J61/30—Vessels; Containers
  • H01J61/34—Double-wall vessels or containers
• • 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
• • 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

Definitions

• the invention is based on a high-pressure discharge lamp according to the preamble of claim 1. It is in particular metal halide lamps with outer bulbs which are capped on one side. However, the invention is also suitable for use in high-pressure sodium or mercury discharge lamps.
• a high-pressure discharge lamp is already known from EP-A 517 304, in which a discharge vessel which is closed on two sides is held in an outer bulb by means of a frame.
• both the power supply close to the base and the electrical supply line remote from the base are encased by an insulating sheath made of quartz glass in order to avoid flashovers during hot re-ignition. Because it is assumed that a flashover occurs primarily between these two conductors, their effective distance is extended by the fact that the power supply close to the base is encased with its associated electrical supply line from its exit from the shaft of the discharge vessel to almost the point of intersection. This extends the rollover distance.
• the hot-ignitability of metal halide lamps with an outer bulb and a high electrical output of preferably 4 kW to 12 kW should be improved.
• the lamps consist of an outer bulb with a base on one side and a discharge vessel arranged in it, located on the lamp axis and sealed on both sides. It is closed by means of two sealing means, in particular melts or bruises.
• gaseous mercury and gaseous metal halides in the discharge vessel.
• a sliding spark discharge which is formed between the free end of the supply line near the base and the insulating sheath on the supply line remote from the base.
• the sliding spark discharge migrates from the sheath to the supply line remote from the base itself, so that a breakdown can occur as a result.
• the free end of the feed line near the base is covered according to the invention by a cap against the casing.
• the cap is hollow cylindrical. It can be adapted in shape to the sealing part, that is, in the event of a meltdown, shaped, rectangular in the case of a crush in cross-section.
• the cap is open at least at the first end facing the discharge vessel. It is preferably closed at the second end facing the base, in particular when the outer bulb is closed by means of a Moly-Cup melt or by means of a pinch with foils. This prevents rollovers to these metal parts.
• the free end of the supply line close to the base is advantageously angled transversely to the lamp axis, because then a good weld or solder connection to the base supply line can be guaranteed.
• the cap is then advantageously slotted on one side and designed as a tube, in particular as a glass tube made of quartz glass.
• the outer bulb is preferably evacuated or filled with nitrogen.
• a typical value for the nitrogen filling pressure (cold) is 400 to 1400 mbar, in particular 800 mbar to 950 mbar.
• the cap enables a more compact design and greater freedom in the construction of the lamp.
• the length of the part of the power supply line near the base protruding from the discharge vessel is a maximum of six times (preferably at most three times) the diameter of the supply line close to the base. This length or this ratio can therefore be kept extremely short compared to the prior art.
• the cap is preferably attached to parts of the lamp. This happens either by being “locked” loosely between several parts, or by being on one Part is rigidly attached: In particular, the case (for example a quartz glass tube) on the long power supply comes into question.
• the cap can be fused to it by means of an adhesive glass part (for example in the form of adhesive strips), but can also be cemented or tied to it.
• Figure 1 shows a metal halide lamp, in section
• Figure 2 shows the lamp of Figure 1 with a base
• FIG. 3 shows the cap of the lamp from FIG. 1 in detail;
• FIG. 4 shows a cross section of the cap from FIG. 3
• Figure 5 shows another embodiment of a metal halide lamp, in
• Figure 6 shows another embodiment of a detail of the lamp
• FIGS. 1 and 2 show the construction of a high-pressure discharge lamp with a base on one side according to the invention.
• the high-pressure discharge lamp described here in the exemplary embodiment is a metal halide lamp for photo-optical purposes with a power consumption of 6 kW.
• the high-pressure discharge lamp has a discharge vessel 1 made of quartz glass which is closed on both sides and in which an ionizable filling gas and two electrodes 2 are enclosed.
• the discharge vessel 1 is held by means of a two-part frame 3, 4 in an outer bulb 5 filled with nitrogen (900 mbar cold filling pressure) and sealed on one side.
• the outer bulb 5 is essentially axially symmetrical. Its end 6 near the base is connected to a ceramic base 7, which has contact pins 18, by means of a metallic sleeve 24.
• the lamp has a high dielectric strength of more than 50 kV.
• a long frame bracket 3 runs along the discharge vessel 1 to the end 8 of the outer bulb which is remote from the base and is there with a power supply 9 which comes from the Discharge vessel is axially connected.
• the bracket has been soldered to the power supply using nickel solder or also welded to it.
• This power supply 9 remote from the base is inserted in a pump connector 12 at the end 8 of the outer bulb remote from the base.
• the long bracket 3 is partially encased in the vicinity of the base by a quartz glass tube 13 which is inserted in a tubular extension 25 at the end 6 of the outer bulb 5 near the base. It is so chamfered at the end remote from the base (23) that it is extended towards the discharge vessel, which increases the length of the rollover path.
• a short frame bracket 4 which is arranged predominantly parallel to the long bracket 3, is held in a tubular extension 25 at the end of the outer bulb 6 near the base.
• the wire diameter D of the short bracket 4 is 3 mm.
• the free end 14 of the bracket 4 is angled and arranged transversely to the lamp axis. It is connected to the power supply line 15, which is led out of the discharge vessel near the base end 16 (in the form of melting or pinching) of the discharge vessel, for example by soldering or welding.
• the length L of the part of the power supply protruding from the discharge vessel is 6 mm.
• the ratio L D 2.
• a tubular cap 10 with an open first end 19 and a closed second end 20 is axially aligned (see FIGS. 3 and 4). It surrounds the short power supply 15 completely at a distance and shields above all the end 14 of the bracket 4 lying transversely to the axis against the sheath 13. This bow end 14 is inserted into the cap through an axially parallel slot 21, which extends from the open first end 19 of the cap about two thirds of the length of the cap. Ultimately, the power supply 15 and the angled end 14 of the feed line 4 are enclosed in the cap.
• the extension tubes 25 are led out of the bottom 11 at the end of the outer bulb.
• the cap 10 sits loosely on the floor 11 with its second end 20. In addition, it lies loosely against the sleeve 13 with its side wall. Thus, on the one hand it is adequately fixed, on the other hand it has enough scope for thermal expansion during lamp operation. Overall, the cap is loosely attached to the short supply line. A special measure for attaching the cap is not necessary, which has a time-saving and cost-effective effect and considerably simplifies the manufacturing process.
• the first end 19 of the cap ends approximately in Height of the end of the melting 16 of the discharge vessel designed as a solid cylinder.
• the ends of the feed lines 3, 4 are each surrounded by a cup-like hollow cylinder 22 made of molybdenum (so-called Moly-Cup).
• Moly-Cup molybdenum
• the bottom of the hollow cylinder 22 is connected to the feed line 4 or the quartz glass tube 13 of the feed line 3.
• the free end of the hollow cylinder runs out thinly and ends in the extension tube 25.
• the Moly Cup melting represents a commercially available quartz glass-metal transition. This transition is vacuum-tight. Further details can be found, for example, in US-A 3804045.
• the ends of the frame brackets 3, 4, which each still protrude beyond the Moly Cup 20, are each connected to a nickel strand 17.
• the wire 17 is guided in a central bore of the contact pin 18 to the end thereof and soldered there to the pin 18.
• This lamp achieved a significantly more reliable hot re-ignition compared to a lamp of the same design without a cap.
• a time window between switching off and reigniting was tested, which was between a few seconds and seven minutes.
• the capless lamp did not light between 3 and 6 minutes.
• the same reference numerals correspond to the same parts as in FIG. 2.
• the free end 32 of the casing 29 of the feed line 3 remote from the base is designed in a step-like manner, which offers processing advantages over chamfering.
• the cap 30 is pulled 10 mm over the sealing means 16 and surrounds it at a short distance. This not only prevents the sliding spark discharge to the supply line 3 along the casing 29, but also makes it more difficult for a direct breakdown between the free end 14 of the supply line 4 near the base and the supply line 3 remote from the base. Not only the first end 28, but also the second end 31 of the cap 30 near the base is open.
• FIG. 6 shows a further exemplary embodiment in detail, in which the cap 35 is fastened to the quartz glass tube 13 by being melted there.
• This passes through two adhesive strips 36 made of quartz glass, which extend along the cap 35 on the quartz glass tube 13. 6b, the adhesive glass part 36 (two adhesive strips) can be clearly seen at the two angles between the cap and the quartz glass tube.
• the adhesive strips cannot be seen in the side view (FIG. 6a), since the cut is chosen centrally; in this section, however, the slot 21 is clearly visible.

Landscapes

• Vessels And Coating Films For Discharge Lamps (AREA)
• Common Detailed Techniques For Electron Tubes Or Discharge Tubes (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=7924107

Family Applications (1)

Country Status (8)

Families Citing this family (8)

Family Cites Families (8)

• 1999
  • 1999-09-30 DE DE19947242A patent/DE19947242A1/de not_active Withdrawn
• 2000
  • 2000-04-08 JP JP2001527316A patent/JP2003510781A/ja active Pending
  • 2000-04-08 EP EP00925075A patent/EP1138057A1/de not_active Withdrawn
  • 2000-04-08 US US09/831,521 patent/US6600267B1/en not_active Expired - Lifetime
  • 2000-04-08 CN CN00802116.3A patent/CN1213458C/zh not_active Expired - Fee Related
  • 2000-04-08 WO PCT/DE2000/001090 patent/WO2001024222A1/de not_active Application Discontinuation
  • 2000-04-08 CA CA002352081A patent/CA2352081A1/en not_active Abandoned
  • 2000-08-02 TW TW089115485A patent/TW457512B/zh not_active IP Right Cessation

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events