EP0593117A1 - Capped electric lamp - Google Patents
Capped electric lamp Download PDFInfo
- Publication number
- EP0593117A1 EP0593117A1 EP93202832A EP93202832A EP0593117A1 EP 0593117 A1 EP0593117 A1 EP 0593117A1 EP 93202832 A EP93202832 A EP 93202832A EP 93202832 A EP93202832 A EP 93202832A EP 0593117 A1 EP0593117 A1 EP 0593117A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- lamp
- partition wall
- base portion
- cap
- lamp cap
- 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- Withdrawn
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J5/00—Details relating to vessels or to leading-in conductors common to two or more basic types of discharge tubes or lamps
- H01J5/50—Means forming part of the tube or lamps for the purpose of providing electrical connection to it
-
- 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
- H01J61/366—Seals for leading-in conductors
- H01J61/368—Pinched seals or analogous seals
Definitions
- the known lamp cap is of the G38 type, a type having comparatively heavy metal pins whose centrelines are 38 mm removed from one another. Lamp caps of this or a similar type can be used in standardized lampholders. As a result, the known lamp can be used as a replacement for traditional halogen lamps, which do not require a high ignition voltage, in an environment comprising a standardized lampholder.
- this object is achieved in that the base portion and the shell portion form one integral body, and in that the partition wall is made of ceramic material and is provided with a foot which is fixed on the base portion.
- walls extend from the foot transverse to the partition wall, between which walls the seal of the lamp vessel is accommodated. A further increased resistance to high voltages can be achieved by this.
- the walls may be connected to the shell portion, if so desired, for example with cement, so as to seal any interstices.
- the partition wall extends to above the lamp cap in a favourable embodiment.
- the capped electric lamp may be used, for example, as a studio or theatre lamp, for projection purposes, or for creating light spots.
- the medium may comprise, for example, rare-earth bromide, mercury, mercury bromide, cesium iodide, and rare gas, for example, argon/krypton with a pressure of, for example 80, mbar.
- the current conductors are screened from one another by glass tubes 8 and 9 where they run adjacent one another.
- the lamp is provided with a ceramic lamp cap 10 of, for example, steatite with a base portion 11 and a shell portion 12 in which the seal 4 of the lamp vessel 1 is fixed.
- the lamp cap has electric contacts 13 to which respective current conductors 3 are connected, and metal pins 13 which issue from the base portion 11 to the exterior.
- the pins have not only a mechanical function in facilitating mounting in a lampholder, but also an electrical function, i.e. in making electrical contact with terminals of the lampholder, and thus with a supply. Separate electric contacts as in the known lamp are accordingly absent in this embodiment.
- a partition wall 20 of insulating material is present which projects into the slit 5 of the lamp vessel and which forms an individual compartment 14 in the lamp cap for each current conductor 3 together with the respective electric contact 13.
- the foot 21 of the partition wall 20 is fixed to the base portion with cement 22, for example, lamp cement.
- the pins 13 issue from the lamp cap 10 to the exterior through ceramic rings 16 provided outside the lamp cap.
- the lamp shown is suitable for being reignited in the hot state at a voltage of 50 kV.
Abstract
The capped electric lamp of the invention has a ceramic cap (10) having a shell portion (12) and an integral base portion (11) which bears metal pins (13). A lamp vessel (1) having a seal (4), from which current conductors (3) to an electric element (2) within the lamp vessel extend beside one another to the exterior, is fixed in the cap (10). Outside the lamp vessel the current conductors (3) each have a portion having a glass envelope (6) which is connected to the seal. The glass envelopes (6) defining a slit (5) between them. A ceramic partition wall (20) having a foot (21) is fixed on the base portion (11) and extends into the slit (5), thereby creating for the current conductors and respective contact members connected thereto their own compartment (14) in the cap. The lamp cap (10) and the partition wall (20) are readily obtainable and easy to assemble and nevertheless allow for high voltages to be used to ignite or to hot restrike the lamp.
Description
- The invention relates to a capped electric lamp comprising:
a glass lamp vessel which is sealed in a vacuumtight manner and in which an electric element is arranged, which element is connected to current conductors which issue next to one another through a seal of the lamp vessel to the exterior where they each have a portion comprising an individual glass envelope which is connected to the seal, these envelopes being mutually separated by a slit;
a ceramic lamp cap having a base portion and a shell portion in which the seal of the lamp vessel is fixed, which lamp cap comprises electric contacts to each of which a respective current conductor is connected, and metal pins which project from the base portion to the exterior,
a partition wall of insulating material being present in the lamp cap, extending into the slit of the lamp vessel and forming an individual compartment in the lamp cap for each of the current conductors in conjunction with the respective electric contact. - Such a capped electric lamp is known from US 4 542 316.
- In the known lamp, the seal of the lamp vessel has a saw cut between the current conductors in order to give each current conductor its own glass envelope which is connected to the seal and which is separated from the other one by a slit. The object of this is to increase the electric creepage path between exposed portions of the current conductors. This enhances the possibility of the lamp being ignited at a comparatively high voltage of, for example, several kV. A further increase in the creepage path is achieved in that a partition wall in the lamp cap divides the lamp cap into compartments and enters the slit.
- The known lamp cap is of the G38 type, a type having comparatively heavy metal pins whose centrelines are 38 mm removed from one another. Lamp caps of this or a similar type can be used in standardized lampholders. As a result, the known lamp can be used as a replacement for traditional halogen lamps, which do not require a high ignition voltage, in an environment comprising a standardized lampholder.
- The known lamp cap is built up from two identical ceramic parts which are joined together when the lamp vessel is provided, together with contacts, metal pins, and mica plates which are to form the partition wall, and are fastened to one another with cement. For several applications, moreover, the electric element must be given a defined position relative to the lamp cap. This renders the assembly of the known electric lamp complicated.
- EP 0 455 295 A1 discloses a high-pressure discharge lamp in which two saw cuts are made in the seal of the lamp vessel at a distance from one another and in which the glass between these saw cuts is broken away so as to make a slit. A fold is present in the base portion of the ceramic lamp cap of the lamp, extending to inside the slit.
- A similar lamp is known from
GB 2 100 404 B. Here a glass tube surrounding each of the current conductors is connected to the seal so as to form a slit between said current conductors. An incision is present running from the base portion of the ceramic lamp cap of the lamp which partly coincides with the slit. This lamp and the lamp of the cited EP 0 455 295 A1 have contact pins which are comparatively close together. They are designed for use in a lampholder which has a partition wall which enters the incision or the fold, respectively. Lampholders for lamp caps of the G38 type do not have such a partition wall. - It is an object of the invention to provide a capped electric lamp of the kind described in the opening paragraph which has a lamp cap of simple construction which is easy to assemble together with the lamp vessel.
- According to the invention, this object is achieved in that the base portion and the shell portion form one integral body, and in that the partition wall is made of ceramic material and is provided with a foot which is fixed on the base portion.
- The shell portion and the base portion of the lamp cap are integral, and yet the lamp cap in cooperation with the lamp vessel can withstand very high voltages. The lamp cap may be identical to a lamp cap which is suitable for use with a conventional halogen lamp. This leads to savings in the cost price of the lamp cap and thus of the lamp, and also to simpler logistics.
- The partition wall may be provided immediately before or during mounting of the lamp vessel in the lamp cap. When the lamp vessel is fixed in the lamp cap, for example with cement, the partition wall is fixed at the same time and secured to the base portion.
- Alternatively, the partition wall may be fixed on the base portion by means of the metal pins. These may project each through an opening in the base portion and be fixed by means of, for example, a flanged or an upset rim. They may in that case grip around the foot of the partition wall, for example, in that they project through a recess or a hole in this foot. The lamp cap may then be fed to the assembly line of the lamp as an inseparable unit.
- An alternative possibility is for the partition wall to be fixed in the lamp cap by means of an adhesive, for example a cement such as, for example, lamp cement. This may take place during or before mounting of the lamp vessel. In the latter case, the lamp cap is again made available on the assembly line of the lamp as a unit.
- It is favourable for easy lamp cap manufacture when the base portion of the lamp cap is on average comparatively thin-walled, and thus contains comparatively little material. In a favourable embodiment, the base portion has corrugations between the metal pins transverse to the imaginary connecting line thereof, while the foot of the partition wall has corrugations which are complementary to the former. The corrugations facilitate positioning of the partition wall and keep the partition wall in position once it has been provided, or temporarily positioned when an adhesive is used, previous to curing or solidifying thereof. They also increase the creepage path along the base portion.
- In a favourable embodiment, walls extend from the foot transverse to the partition wall, between which walls the seal of the lamp vessel is accommodated. A further increased resistance to high voltages can be achieved by this. The walls may be connected to the shell portion, if so desired, for example with cement, so as to seal any interstices.
- For easy mounting, the partition wall extends to above the lamp cap in a favourable embodiment.
- One or both pins of the lamp cap may serve as electric contact(s) of the lamp. Alternatively, separate elements may act as such. If the pins of the lamp cap form the contacts, it is favourable when they issue from the lamp cap to the exterior through ceramic rings provided outside the lamp cap. The electric creepage path along the outside of the base portion, given a certain interspacing of the pins, is then greater than if these rings were absent, while the manufacture of the lamp cap is simpler than if the rings were integral with the lamp cap. Ceramic rings have the additional advantage over metal rings that they lead to a greater metal/metal distance, i.e. from pin to pin, than do metal rings, i.e. from one, wider metal ring to the other. Ceramic rings here have a similar mechanical usefulness, i.e. distributing the mechanical forces exerted on the lamp cap by the pins, as well as a similar dimensional accuracy.
- The electric element of the lamp may be a pair of electrodes in an ionizable filling. The lamp vessel then is a discharge vessel. Alternatively, however, the electric element may comprise an inner envelope. In an alternative embodiment of the lamp, the electric element may be a coil, for example a toroidal coil, surrounding an electrodeless discharge vessel filled with an ionizable gas.
- The capped electric lamp may be used, for example, as a studio or theatre lamp, for projection purposes, or for creating light spots.
- An embodiment of the capped electric lamp according to the invention is shown in the drawing in which
- Fig. 1a shows a capped electric lamp in side elevation with the lamp cap partly in cross-section;
- Fig. 1b shows the partition wall in the lamp cap taken on the line Ib in Fig. 1a; and
- Fig. 1c is a cross-section through Fig. 1b taken on the line Ic.
- In the drawing, the capped electric lamp has a lamp vessel 1 which is closed in a vacuumtight manner and in which an
electric element 2 is arranged which is connected tocurrent conductors 3 which issue next to one another to the exterior through a seal 4 of the lamp vessel. The current conductors each have a portion outside the lamp vessel which has itsown glass envelope 6 connected to the seal, which envelopes are separated from one another by a slit 5.
Theelectric element 2 in the embodiment drawn is a discharge vessel, for example made of glass with an SiO₂ content of at least 95% by weight, such as quartz glass, in whichelectrodes 7, for example made of tungsten, are arranged in an ionizable medium. The medium may comprise, for example, rare-earth bromide, mercury, mercury bromide, cesium iodide, and rare gas, for example, argon/krypton with a pressure of, for example 80, mbar. Inside the lamp vessel, the current conductors are screened from one another byglass tubes 8 and 9 where they run adjacent one another. The lamp is provided with aceramic lamp cap 10 of, for example, steatite with abase portion 11 and ashell portion 12 in which the seal 4 of the lamp vessel 1 is fixed. The lamp cap haselectric contacts 13 to which respectivecurrent conductors 3 are connected, andmetal pins 13 which issue from thebase portion 11 to the exterior. In the embodiment drawn, the pins have not only a mechanical function in facilitating mounting in a lampholder, but also an electrical function, i.e. in making electrical contact with terminals of the lampholder, and thus with a supply. Separate electric contacts as in the known lamp are accordingly absent in this embodiment.
In thelamp cap 10, apartition wall 20 of insulating material is present which projects into the slit 5 of the lamp vessel and which forms anindividual compartment 14 in the lamp cap for eachcurrent conductor 3 together with the respectiveelectric contact 13. - The
base portion 11 and theshell portion 12 of the lamp cap form one integral body. Thepartition wall 20 is made of ceramic material and has afoot 21 which is fixed on thebase portion 11. It would be technologically difficult to manufacture such a partition wall integrally with the lamp cap. - The
foot 21 of thepartition wall 20 is fixed to the base portion withcement 22, for example, lamp cement. - The
base portion 11 in Fig. 1a has corrugations 15 extending transverse to the imaginary connecting line of the metal pins 13, and thefoot 21 of thepartition wall 20 hascomplementary corrugations 23 cooperating with the former. - Walls 24 (Fig. 1b) extend from the
foot 21 transverse to thepartition wall 20, between which walls the seal 4 of the lamp vessel 1 is accommodated. Thewalls 24 may be connected to theshell portion 12 by means ofcement 22. - The
partition wall 20 extends to above thelamp cap 10. - The
pins 13 issue from thelamp cap 10 to the exterior throughceramic rings 16 provided outside the lamp cap. - The lamp shown is suitable for being reignited in the hot state at a voltage of 50 kV.
Claims (7)
- A capped electric lamp comprising:
a glass lamp vessel (1) which is sealed in a vacuumtight manner and in which an electric element (2) is arranged, which element is connected to current conductors (3) which issue next to one another through a seal (4) of the lamp vessel to the exterior where they each have a portion comprising for each an individual glass envelope (6) which is connected to the seal, these envelopes being mutually separated by a slit (5);
a ceramic lamp cap (10) having a base portion (11) and a shell portion (12) in which the seal (4) of the lamp vessel (1) is fixed, which lamp cap comprises electric contacts (13) to each of which a respective current conductor (3) is connected, and metal pins (13) which project from the base portion (11) to the exterior,
a partition wall (20) of insulating material being present in the lamp cap (10), extending into the slit (5) of the lamp vessel and forming an individual compartment (14) in the lamp cap for each of the current conductors (3) in conjunction with the respective electric contact (13),
characterized in that the base portion (11) and the shell portion (12) form one integral body, and in that the partition wall (20) is made of ceramic material and is provided with a foot (21) which is fixed on the base portion (11). - A capped electric lamp as claimed in Claim 1, characterized in that the foot (21) of the partition wall (20) is fixed to the base portion with cement (22).
- A capped electric lamp as claimed in Claim 1 or 2, characterized in that the base portion (11) has corrugations (15) transverse to the imaginary connecting line of the metal pins (13), and the foot (21) of the partition wall (20) has complementary corrugations (23) cooperating with the former.
- A capped electric lamp as claimed in Claim 1, 2 or 3, characterized in that walls (24) extend from the foot (21) transverse to the partition wall (20), between which walls the seal (4) of the lamp vessel (1) is accommodated.
- A capped electric lamp as claimed in Claim 4, characterized in that the walls (24) are connected to the shell portion (12).
- A capped electric lamp as claimed in Claim 1, characterized in that the partition wall (20) extends to above the lamp cap (10).
- A capped electric lamp as claimed in Claim 1, characterized in that the pins (13) issue from the lamp cap (10) to the exterior through ceramic rings (16) provided outside the lamp cap.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP93202832A EP0593117A1 (en) | 1992-10-12 | 1993-10-06 | Capped electric lamp |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP92203131 | 1992-10-12 | ||
EP92203131 | 1992-10-12 | ||
EP93202832A EP0593117A1 (en) | 1992-10-12 | 1993-10-06 | Capped electric lamp |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0593117A1 true EP0593117A1 (en) | 1994-04-20 |
Family
ID=26131733
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP93202832A Withdrawn EP0593117A1 (en) | 1992-10-12 | 1993-10-06 | Capped electric lamp |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP0593117A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2439765A3 (en) * | 2010-10-11 | 2013-05-01 | General Electric Company | Shrouded discharge lamp with reduced arcing |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0455295A1 (en) * | 1990-05-01 | 1991-11-06 | Koninklijke Philips Electronics N.V. | High-pressure discharge lamp |
DE9205537U1 (en) * | 1992-04-23 | 1992-06-17 | Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen Mbh, 8000 Muenchen, De |
-
1993
- 1993-10-06 EP EP93202832A patent/EP0593117A1/en not_active Withdrawn
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0455295A1 (en) * | 1990-05-01 | 1991-11-06 | Koninklijke Philips Electronics N.V. | High-pressure discharge lamp |
DE9205537U1 (en) * | 1992-04-23 | 1992-06-17 | Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen Mbh, 8000 Muenchen, De |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2439765A3 (en) * | 2010-10-11 | 2013-05-01 | General Electric Company | Shrouded discharge lamp with reduced arcing |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US4347460A (en) | Compact fluorescent lamp assembly | |
JP4536513B2 (en) | Mercury-free metal halide lamp | |
EP0313027B1 (en) | Arc discharge lamp with ultraviolet radiation starting source | |
EP0960433B1 (en) | High-pressure discharge lamp | |
US5661367A (en) | High pressure series arc discharge lamp construction with simplified starting aid | |
EP0596735B1 (en) | Arc tube with a starting source | |
EP0313028B1 (en) | Arc discharge lamp with electrodeless ultraviolet radiation starting source | |
US5086249A (en) | Compact discharge lamp unit and method for manufacturing same | |
EP0722184B1 (en) | Starting aid for metal halide lamps | |
JPH04294048A (en) | High-voltage discharge lamp using metal halogenide | |
EP0462780A1 (en) | Shield for high pressure discharge lamps | |
US5422535A (en) | Capped electric lamp | |
CA1176687A (en) | Bi pin base for single ended discharge lamp | |
EP0593117A1 (en) | Capped electric lamp | |
US5334906A (en) | Metal halide arc discharge lamp having short arc length | |
US3737717A (en) | High intensity lamp containing thermal shorting fuse | |
CA2613730C (en) | Starting aid for low wattage metal halide lamps | |
EP0145291A1 (en) | Improvements in sealed beam lamps | |
EP0520538B1 (en) | High-pressure discharge lamp | |
EP0108449B1 (en) | Electric lamp | |
JPS61216232A (en) | Metal halide lamp | |
JP2586682B2 (en) | Single sealed metal vapor discharge lamp | |
EP0156435B1 (en) | High-pressure discharge lamp | |
EP0596676B1 (en) | High-pressure sodium discharge lamp | |
JPS618841A (en) | Device for reducing loss of alkaline metal of high intensitydischarge lamp |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE DK ES FR GB IT NL |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: N.V. PHILIPS' GLOEILAMPENFABRIEKEN |
|
17P | Request for examination filed |
Effective date: 19941019 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN |
|
18W | Application withdrawn |
Withdrawal date: 19950320 |