CN1128581A

CN1128581A - Electrode-less high-pressure discharge lamp

Info

Publication number: CN1128581A
Application number: CN 95190433
Authority: CN
Inventors: J·A·J·M·范弗尔伊特; K·勒恩; A·克伯
Original assignee: Philips Electronics NV
Current assignee: Koninklijke Philips NV
Priority date: 1994-04-14
Filing date: 1995-04-06
Publication date: 1996-08-07
Also published as: EP0704104A1; WO1995028734A1; JPH08511908A

Abstract

The present invention relates to an electrode-less high pressure discharge lamp having a lamp vessel (1) which is surrounded by an electric coil (2). The coil (2) has a first and a second outer turn (3, 4) and a third turn (9) in between. The outer turns are thermally coupled to a heat-sink (10), at least one of them in an electrically insulated manner. Also the third turn (9) is coupled to a heat-sink (13), as the case may be in an electrically conductive manner and at earth-potential. An improved cooling of the coil is obtained.

Description

Electrode-less high-pressure discharge lamp

The present invention relates to a kind of electrode-less high-pressure discharge lamp, this discharge lamp comprises:

The fluorescent tube of a printing opacity is sealing with the vacuum tight form, and ionogenic charges are equipped with in the inside;

An electric coil, be enclosed within on the fluorescent tube, form by the first outer wire turn, the second outer wire turn and the 3rd wire turn that is clipped between two outer wire turns, the first and second outer wire turn ends separately are electrically connected with first and second electric conductors respectively, first and second electric conductors stretch out out from coil, for connecing power supply design;

First and second electric conductors are connected with fin with the method for heat, the while at least one of them by means of electric insulation hold concurrently heat conductor and fin electric insulation.

Not long ago the european patent application 94200250.2 (PHN14.376) of Gong Buing has just been introduced this electrode-less high-pressure discharge lamp.

Electric current flows through the heat that electric conductor and coil produce, and adds the heat that discharge tube is radiated coil, and both need to have become the factor of cooling electric conductor, so just can avoid the power pack temperature too high.Should prevent that in addition thereby the overheated resistance of coil from raising.The resistance rising can make resistance loss increase from and temperature is raise again.

The lamp of above-mentioned patent application is connected electric conductor and cools off with fin, heat like this by fin from electric conductor looses environment around removing.Here, the electric conductor of charged lead-in wire by aluminum nitride body and fin thermo-contact, aluminium nitride be good heat conductor be again good electrical insulator.This makes when touching described radiator sheet safety and sound.In addition, the fin of the neutral line can also be combined into an integral body with the fin of live wire.

In European patent EP 0440381 disclosed this lamp, two electric conductors all are electrically connected with corresponding fin respectively.From U.S. Pat 5,030,889 also can see similar electrode-less high-pressure discharge lamp.

U.S. Pat 5,039,903 and US5,042,139 disclosed electrode-less high-pressure discharge lamp, each end of its electric coil is connected with ballast through corresponding fin, and each electric conductor departs from these fin one segment distances extensions.Coil in these lamps can be cooled off with recirculated water.The shortcoming of doing like this is to need to supply water and flowing line, thereby needs drive unit and consume relevant electric energy.

U.S. Pat 5,910,439 disclosed electrode-less high-pressure discharge lamps compressed air cooling electric coil.The shortcoming of this lamp is motor and pipeline and the required electric energy that needs cooling usefulness.

The purpose of this invention is to provide described reliable device electrode-less high-pressure discharge lamp of this specification beginning with the sort of powerful cooling electric coil and electric conductor.

According to the present invention, above-mentioned purpose is that sample reaches: three-way linkage is received the 3rd electric conductor that extends from coil and be connected with fin with the method for heat at least.

The above-mentioned measure of lamp of the present invention also away from outside the position of wire turn end make the coil heat radiation.When the 3rd circle in the lamp selects for use the number of turn to be the middle wire turn of odd number, above-mentioned position even can also be away from position farthest, each end.The number of turn of coil also can connect fin with extra wire turn during more than three circles in case of necessity.

In a specific embodiment, the 3rd electric conductor also is electrically connected with fin, is in earth potential in the course of the work, simultaneously first and second electric conductors respectively by means of be electrical insulator be again the object and the fin electric insulation of heat conductor.

In this embodiment, at this moment first and second electric conductors just become positive negative conductor.The benefit of present embodiment is, and is on good terms when touching with fin that the 3rd electric conductor is connected.When the 3rd wire turn was the middle wire turn of coil, the current potential of first and second electric conductors was with respect to the earth potential symmetry, otherwise asymmetric.

Yet, when the 3rd electric conductor by means of be electrical insulator be again object and the fin electric insulation of heat conductor or relevant fin when being in earthy insulator or housing and encapsulating, but also safe touch fin.

If the 3rd electric conductor is connected with fin through electrical insulator, then all electric conductors can be coupled to same fin.

In a preferred embodiment, lamp is coupled on the fiber waveguide, for example light pipe.

Electric insulation heat conduction is had both body and is adopted aluminium nitride favourable.Aluminium nitride resistivity is higher, and about 10 ¹²Europe rice, thermal conductivity are also higher, about 150 watts of rice ^-1K ^-1This make its be specially adapted between energized conductor and the electric conductor hot link but on non-electric-connecting.

Electrode-less high-pressure discharge lamp profile of the present invention is small and exquisite, need not to use fluid and relevant circulating device such as air or water fully.However, still effectively reduced the resistance loss of the power supply that uses and to the harm of power supply.

Some cranes of electrode-less high-pressure discharge lamp of the present invention have been shown in the accompanying drawing, wherein:

Fig. 1 is the perspective view of lamp;

Fig. 2 is the generalized section along the II-II line intercepting of Fig. 1;

Fig. 3 is the generalized section along the III-III line intercepting of Fig. 1;

Fig. 4 shows the plane graph of Fig. 1 coil modification;

Fig. 5 shows the view of the coil of Fig. 4 along the V line among this figure;

Fig. 6 is the section of Fig. 2 second embodiment;

Fig. 7 is the section of Fig. 3 second embodiment;

Fig. 8 is the section of the 3rd embodiment.

The printing opacity fluorescent tube 1 of electrode-less high-pressure discharge lamp is sealing with the form of vacuum tight among Fig. 1, make by for example quartz glass, and 2 cubic centimetres of volumes, but also available ceramic material such as aluminium oxide is made.Ionizable charges are housed, 2.5 milligrams NaI for example, 1.5 milligrams CeI in the fluorescent tube ₃Xe with 125 millibars.

Electric coil 2 is become by for example copper, is enclosed within on the fluorescent tube, and the end of its first and second wire turn 3,4 is respectively 5,6 each end and is electrically connected with first electric conductor 7 and second electric conductor 8 respectively, and this two electric conductor Yan Lixianquan designs for connecting power supply.The 3rd wire turn 9 of coil 2 is outside between the wire turn 3,4.First electric conductor 7 is connected with fin 10 with second electric conductor, 8 usefulness by the use of thermal means, and at least one of them by means of be electrical insulator be again the element 11 and fin 10 electric insulations of heat conductor.

The 3rd wire turn connects the 3rd electric conductor 12, electric conductor 12 Yan Lixianquan, and be connected with fin 13 in the mode of heat at least.Among the figure, the 3rd electric conductor 12 also is electrically connected with fin 13, but is in the earth potential (see figure 3), first and second

electric conductors

7,8 all by be electrical insulator be again that the element 11 of heat conductor is connected with fin 10 (see figure 2)s in the mode of electric insulation, the element 11 among the figure is that aluminium nitride is made.

Fluorescent tube 1 is contained in the shell 20, and reflector 21 usefulness wire grids 2 are isolated.The fin 10a of

fin

10,13,13a improve the function of dispelling the heat in the ambient atmosphere.

Do not take in the lamp of above-mentioned measure of the present invention, copper coil is in the course of the work because of oxidation very blackening, and lamp of the present invention does not then have blackening phenomena or blackening phenomena to significantly reduce.This point has just proved that the working temperature of coil has descended.

Among Fig. 2,

conductor

7,8 is become by for example copper, is clipped between 10 liang of aluminum nitride bodies 11 of fin.They can be received on the power supply by isolating transformer, thereby are in the positive and negative potential state with respect to earth potential.

The 3rd electric conductor 12 is become by copper for example, with the metallic plate 13b hot link of fin 13 be electrically connected, thereby thereby fin the 3rd conductor all be in earth potential.

Among Fig. 4-8, all compile with same numbering with each several part corresponding among above each figure.

Among Fig. 4 and Fig. 5, coil is made by copper coin.The end 9a of the 3rd wire turn clamps 12 of the 3rd electric conductors by the 3rd electric conductor 12 and is clipped in the fin 13 between each aluminum nitride body 14.First electric conductor 7 (Fig. 6) is clipped in fin between the metallic plate 10b, and is electrically connected and hot link with metallic plate 10b.Second electric conductor 8 is enclosed in fin between the aluminum nitride body 14 and is connected with aluminium nitride, heat conduction and electric insulation.

The 3rd electric conductor 12 (Fig. 7) by be electrical insulator be again that the element 14 of heat conductor is connected with fin 13, make its both electric insulation and heat conduction.

Among Fig. 8, fluorescent tube 1 surface scribbles ZrO ₂Coating 1 ' thereby this surface reflection.The lamp of seeing among the figure has only a

fin

10,13 with the first conductor hot link be electrically connected, second heat conductor then by element 11 with

fin

10,13 heat conduction and electric insulation, the 3rd conductor is also by element 14 and fin 10.13 heat conduction and electric insulation.Light pipe and reflector are one also.The power pack of lamp can be contained in the shell 26.

Claims

1. electrode-less high-pressure discharge lamp comprises:

The fluorescent tube of printing opacity (1) is sealing in the mode of vacuum tight, and ionogenic charges are housed in the pipe;

Electric coil (2), be enclosed within on the fluorescent tube, by the first outer wire turn (3), the second outer wire turn (4) and the 3rd wire turn (9) that is clipped between these two outer wire turns are formed, first and second wire turns end (5 separately, 6) be electrically connected with first electric conductor (7) and second electric conductor (8) respectively, first and second electric conductors stretch out out from coil, design to such an extent that remove to connect power supply;

First and second electric conductors (7,8) are connected with fin (10) with the method for heat, the while at least one of them by means of being that electrical insulator is again the object (11) of conductor and fin electric insulation;

It is characterized in that the 3rd wire turn (9) is connected with the 3rd electric conductor (12), the 3rd electric conductor (12) prolongs from coming from coil, and at least with fin (13) hot link.

2. electrode-less high-pressure discharge lamp as claimed in claim 1, it is characterized in that, the 3rd electric conductor (12) also is electrically connected with fin (13), and be in earth potential, first and and second electric conductor (7,8) then respectively by means of be electrical insulator be again object (11) and fin (10) electric insulation of heat conductor.

3. electrode-less high-pressure discharge lamp as claimed in claim 1 is characterized in that, the 3rd electric conductor (12) by means of be electrical insulator be again that the element (14) of heat conductor is connected with fin (13) electric insulation.

4. electrode-less high-pressure discharge lamp as claimed in claim 3 is characterized in that, to lead the fin (10) of (8) also as a whole with being connected with first conductor (7) and second for the fin (13) that is connected with the 3rd conductor (12).

5. as claim 1,2,3 or 49 described electrodeless high pressure, discharge lamp is characterized in that, the aluminium nitride double as is electrical insulator and heat carrier.

6. as claim 1,2,3 or 4 described electrode-less high-pressure discharge lamps is characterized in that, described lamp is connected with light pipe (25).