GB2156147A - Discharge lamp assembly and method of manufacture - Google Patents
Discharge lamp assembly and method of manufacture Download PDFInfo
- Publication number
- GB2156147A GB2156147A GB08505171A GB8505171A GB2156147A GB 2156147 A GB2156147 A GB 2156147A GB 08505171 A GB08505171 A GB 08505171A GB 8505171 A GB8505171 A GB 8505171A GB 2156147 A GB2156147 A GB 2156147A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tube
- lead
- conductor
- end walls
- tube end
- 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.)
- Granted
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
- H01J61/36—Seals between parts of vessels; Seals for leading-in conductors; Leading-in conductors
- H01J61/366—Seals for leading-in conductors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
- H01J9/24—Manufacture or joining of vessels, leading-in conductors or bases
- H01J9/32—Sealing leading-in conductors
- H01J9/323—Sealing leading-in conductors into a discharge lamp or a gas-filled discharge device
Abstract
The ceramic envelope 21 of a high pressure sodium lamp has integrally moulded end walls 21a, 21b with respective throughholes 22a, 22b in which are sealed electrode lead-in conductors 23a, 23b by means of annular plates 26a, 26b fixed on the outer surface of each tube end wall by an adhesive agent 27a, 27b which fills the gap between the annular plate and the tube end wall but which only partially fills the gap between the throughhole and the lead-in conductor so that the inner end of the adhesive stops short of the inner surface of the tube end wall. By this means reaction between the sodium of the lamp filling and the adhesive agent is prevented, thus reducing sodium loss. In manufacture, the adhesive disc and the annular plate may be placed around the lead-in conductor in any order. <IMAGE>
Description
SPECIFICATION
Light emitting assembly and method for producing same
The present invention relates to an improved light emitting tube assembly for a high-pressure metal vapour electric discharge lamp such as a high pressure sodium vapour lamp, and also to a method for producing such a tube assembly.
Figs. 1 to 4 of the accompanying drawings are longitudinal sections through two conventional tube assemblies illustrating their manufacture.
Conventionally, a light emitting tube having a structure as shown in any of Figs. 1 to 4 has been employed for a high-pressure metal vapour electric discharge lamp such as a highpressure sodium vapour lamp. The light emitting tube shown in Fig. 1 is arranged such that blocking disks 3a and 3b made of a lightpermeable ceramic material are air-tightly secured to the opposite ends of a light-permeable ceramic tube 1 by adhesive agents 2a and 2b, and sodium or the like is enclosed within the tube. A lead-in conductor 5a and an exhaust tube 5b each provided with electrodes 4a and 4b pass through the disks 3a and 3b and are air-tightly secured thereto by adhesive agents 6a and 6b.
That is, as shown in Fig. 2, ceramic disks 3a and 3b are respectively disposed at the upper and lower ends of a light-permeable tube through annularly pressure-molded sealing compounds 7a and 7b. A lead-in conductor 5a and an exhaust tube 5b are respectively provided with electrodes 4a and 4b passing through throughholes 3a' and 3b' respectively formed in the disks 3a and 3b.
Sealing compounds 8a and 8b are respectively disposed on the outer surface of the disk 3a and the inner surface of the disk 3b about the respective insertion portions. The sealing compounds 7a, 7b, 8a and 8b are heat fused, filled between the respective constituent components, and hardened thereat.
Thereafter, the inside of the tube is exhausted through the exhaust tube 5b, and sodium or the like is filled therein.
As shown in Fig. 3, a second prior art example is arranged such that a monolithictype light-permeable ceramic tube tube 11 having integrally molded tube end walls 11 a and 11 b and throughhoies 1 2a and 1 2b respectively formed in the tube end walls 1 1a and 11 b is prepared. A lead-in conductor 1 4 provided with an electrode 1 3 passes through the throughhole 1 2a of the one tube end wall 11 a. An annular sealing compound 1 5 and a ceramic cap 1 6 are disposed on the outer surface of the tube end wall 1 a around the insertion portion. The sealing compound 15 is heat fused and filled and hardened between the respective constituent components.Next, the inside of the tube is exhausted through the throughhole 1 2b of the other tube end wall 11 b, and sodium or the like is enclosed thereinto. Thereafter, a lead-in conductor is inserted through the throughhole 1 2b of the other tube end wall 11 b and secured thereat in the same manner as described above. Fig.
4 shows a light emitting tube produced by this method.
In the case of the first prior art example described above and illustrated in Figs, 1 and 2, it is possible to efficiently assemble the light emitting tube because the opposite ends thereof can be sealed at the same time. Further, this example has the advantage that the exhausting and sodium-filling operations of the tube can be easily performed through the exhaust tube 5b.
This method, however, has a disadvantage that numerous applications of sealing compounds are required to assemble the tube.
The use of numerous applications of sealing compounds not only makes the production high cost, but also gives rise to the possibility of leakage at the sealed portions. Further, if some parts of the sealing compounds are exposed inside the light emitting tube, lamp characteristics, such the lamp voltage, are likely to be affected due to a reaction between the sealing compound and the sodium or the like enclosed in the tube. The deterioration in lamp characteristics is remarkable especially in an unsaturated-type high pressure sodium vapor lamp in which the quantity of sodium enclosed within the tube is minimum in comparision with a saturated-type high-pressure sodium vapor lamp, and is entirely evaporated when the lamp is operated.Accordingly, in such a construction as shown in Fig. 1, there are many problems because often large amounts of the sealing compounds are exposed within the tube.
In the second prior art example shown in
Figs. 3 and 4, on the other hand, there is an advantage that the arrangement of the light emitting tube makes it possible to lessen the amount of sealing compounds exposed within the tube, in comparison with the first prior art example, to thereby suppress the deterioration in lamp characteristics. This method, however, has a disadvantage that not only is the assembly of the light emitting tube inefficient because it is necessary to seal the opposite ends of the tube separately, but also the operation of filling sodium or the like into the tube requires a difficult technique whereby one end portion of the tube is sealed while cooling the material fed into the tube from the other end.Further, there is still some sealing compound exposed inside the light emitting tube so that it is impossible to completely eliminate the deterioration in the lamp characteristics caused by a reaction between the sealing compound and the sodium enclosed within the tube.
The reason why an adhesive agent or a sealing compound is exposed within the light emitting tube is that, when assembling the light emitting tube, the adhesive agent or sealing compound flows into the inside of the tube due to capillary action in the gaps between the various constituent components.
Moreover, it has been found that the deterioration in lamp characteristics is due to a reduction in the amount of sodium in the tube due to a reaction between the sodium and the adhesive agent or sealing compound (ordinarily composed of a mixture of aluminum oxide (Al203), calcium oxide (CaO), magnesium oxide (MgO), etc.) Especially, this tendency is remarkable in a so-called unsaturated-type high-pressure sodium vapor lamp in which a smaller quantity of sodium is employed.
In accordance with one aspect of the present invention a light emitting tube assembly for an electric discharge lamp comprises a light-permeable ceramic tube having tube end walls integrally moulded at opposite ends of the tube and throughholes formed in the tube end walls, lead-in conductors having diameters slighltly smaller than the diameters of the throughholes through which the lead-in conductors pass, and an annular plate fixed on an outer surface of each of the tube end walls with an adhesive agent, a part of the adhesive agent filling a gap between the annular plate and the tube end wall and only partially filling a gap between the throughhole and the lead-in conductor such that an inner end portion of the adhesive agent in the throughhole stops short of an inner surface of the tube end wall.
In accordance with a second aspect of the present invention a method for producing a light emitting tube assembly, comprises the steps of:
preparing a monolithic-type light permeable ceramic tube having tube end walls integrally moulded therewith and respective throughholes formed in the end walls;
inserting a lead-in conductor and an exhaust tube into respective ones of the throughholes and setting the lead-in conductor and the exhaust tube each at a predetermined position, the lead-in conductor and the exhaust tube having diameters slightly smaller than the diameters of the respective throughholes;;
successively fitting annularly pressuremoulded sealing compounds and annular plates made of a heat resistant material onto the lead-in conductor and the exhaust tube at respective portions of the lead-in conductor and the exhaust tube projecting outwardly from the respective tube end walls, and setting the sealing compounds and the annular plates on the respective outer surface of the tube walls; and
heating and fusing the sealing compounds so as to cause the sealing compounds to fill the gaps between one of the end tube walls and the lead-in conductor, between the other one of the tube end walls and the exhaust tube, and between the respective tube end walls and the annular plates, whereby the sealing compound does not completely fill the gaps between the throughholes and the leadin conductor and the exhaust tube.
In accordance with a third aspect of the present invention a method for producing a light emitting tube assembly comprises the steps of:
preparing a monolithic-type light permeable ceramic tube having tube end walls integrally moulded therewith and respective throughholes formed in the end walls;
inserting a lead-in conductor and an exhaust tube into respective ones of the throughholes and setting the lead-in conductor and the exhaust tube each at a predetermined position, the lead-in conductor and the exhaust tube having diameters slightly smaller than the diameters of the respective throughholes;;
successively fitting annular plates made of a heat resistant material and annularly pressuremoulded sealing compounds onto the lead-in conductor and the exhaust tube at the respective portions of the lead-in conductor and the exhaust tube projecting outwardly from the respective tube end walls, and setting the sealing compounds and the annular plates on the respective outer surfaces of the tube end walls; and
heating and fusing the sealing compounds so as to cause the sealing compounds to fill the gaps between one of the tube end walls and the lead-in conductor, between the other one of the tube end walls and the exhaust tube, and between the respective tube end walls and the annular plates, whereby the sealing compound does not completely fill the gaps between the througholes and the lead-in conductor and the exhaust tube.
The present invention provides a tube assembly for an electric discharge lamp having improved light output characteristics and life span by minimizing the reaction between the materials enclosed in the tube assembly and the adhesive agent or sealing compound sealing the end portions of the tube assembly.
The present invention is particularly applicable for use in an unsaturated-type highpressure sodium vapour lamp.
The assembly of the tube can be performed easily and efficiently, the amount of sealing compound used for sealing the tube can be reduced, and the sealing compound prevented from being exposed inside the tube.
Some examples of tube assemblies and methods for their manufacture according to the present invention will now be described with reference to the accompanying drawings, in which:
Figures 5 and 7 are explanatory diagrams of methods for producing two examples of light emitting tube assemblies;
Figures 6 and 8 are cross-sectional views of the tube assemblies produce by the methods of Figs. 5 and 7, respectively; and,
Figure 9 is a graph comparing conventional examples and the present invention.
A method of producing a light emitting tube will be described.
First, as shown in Fig. 5, there is prepared a monolithic-type light-permeable ceramic tube 21 having tube end walls 21a and 21b integrally molded therewith and throughholes 22a and 22b formed in the walls 21a and 21b.
Next, a lead-in conductor 23a and an exhaust tube 23b, each having a slightly smaller diameter than that of the throughholes 22a and 22b, are inserted through the throughholes 22a and 22b of the tube end walls 21a and 21b and set in an axially predetermined position. Electrodes 24a and 24b are fixed in advance at the respective internal end portions of the lead-in conductor 23a and the exhaust tube 23b. An exhaust hole 25 of the exhaust tube 23b is positioned at the inside of the tube wall 21b.
Then, annular plates 26a and 26b, made of a heat resistant metal or a heat resistant material such as ceramics or the like and annularly pressure-molded sealing compounds 27a and 27b are successively tightly set on the respective outer surfaces of the tube end walls 21a and 21b, that is, onto the respective portions of the lead-in conductor 23a and the exhaust tube 23b projecting from the tube end walls 21a and 21b. Preferably, the annular plates 26a and 26b are annular metal plates made of a high-melting point metal such as tantalum, niobium, or the like. Annular ceramic plates may be used as the annular plates 26a and 26b.
Upon completion of the placement of the respective components as described above, the sealing compounds 27a and 27b are heated and fused to seal the light emitting tube. The lower annular plate 26b is fitted between the outer surface of the tube end wall 21b and a tantalum wire welded in a suitable position at a portion of the outer periphery of the exhaust tube 23b projecting from the tube end wall 21b, the lower annular plate 26b being supported thereat. Then, the sealing compound 27b is fixed on the outer side of the annular plate 26b by a suitable support and heat fused. Liquefied sealing compound is filled between the tube end wall 21b and the exhaust tube 23b and between the tube end wall 21b and the annular plate 26b by capillary action.
In this case, if there were no annular metal plate, most of the sealing compound would spread over the internal end surface of the tube end wall 21b through the throughhole 22b. Due to the presence of the annular metal plate, however, the sealing compound filled between the metal plate and the tube end wall 21b can spread but the compound remains around the outsode surface of the tube end wall 21 b due to the wetting characteristics of the metal plate. Thus, the sealing compound is prevented from being exposed inside the light emitting tube.
Similarly to the lower end portion, the sealing compound is filled between the respective components at the upper end portion of the light-permeable ceramic tube 21 by capillary action.
Although the annular plates 26a and 26b made of heat resistant metal or heat resistant material such as ceramics or the like and the annularly pressure-molded sealing compounds 27a and 27b are tightly set on the respective outer surfaces of the tube end walls 21 a and 21 b, that is, on the respective portions of the lead-in conductor 23a and the exhaust tube 23b projecting from the tube end walls 21a and 21b in embodiment described above, they may be set on the respective outer surfaces of the tube end walls 21 a and 21 b successively in the reverse order, that is, in the order of the sealing compounds 27a and 27b and then the annular plates 26a and 26b. This approach is illustrated in Figs. 7 and 8.
Here, if the lower annular plate 26b is fixed on a suitable support, the liquefied sealing compound 27b is filled between the tube end wall 21 b and the exhaust tube 23b and between the tube end wall 21b and the annular plate 26b by their weight of the lightpermeable ceramic tube 21 and the capillary action. In this case, if there were no annular metal plate, most of the sealing compound would spread over the internal end surface of the tube end wall 21b through the throughhole 22b. However, due to the presence of the annular metal plate, the sealing compound filled between the metal plate and the tube end wall 21b may spread but is confined to the area around the outside surface of the tube end wall 21b due to the wetting characteristics of the metal plate.Thus, the sealing compound is prevented from being exposed inside the light emitting tube. Further, at the upper end portion of the light-permeable ceramic tube 21, the sealing compound is filled between the respective constituent components by their weight of the annular plate 26a and the sealing compound 27a and capillary action, similarly to the case of the lower end portion.
After the sealing compound has been filled between the respective components and hardened, the fabrication of the light emitting tube is completed through steps including exhausting the inside of the tube through the exhaust hole 25 of the exhaust tube 23b; filling sodium, mercury, a rare gas, or the like, in the tube; and press-sealing the outer end portion of the exhaust tube 23b.
As is apparent from the description above, an annular plate is disposed on the outer surface of each of the opposite tube end walls of a monolithic-type light-permeable ceramic tube, and sealing compound is put on the annular plate, or, conversely, the annular plate is placed over the sealing compound, whereby sealing compound is absorbed and filled among the respective constituent components by capillary action, not only at the upper end portion, but also at the lower end portion of the tube. Thus, the present invention has the advantages that both ends of the light emitting tube can be sealed at the same time.
Further, it is possible to control the amount of the sealing compound flowing into the gaps between the tube end wall and the leadin conductor and between the former and the exhaust tube by causing a part of the sealing compound to fill the gap between the tube end wall of the tube and the annular plate, whereby the inner end portion of the sealing compound stops short of the inner surface of the tube end wall so as to prevent the sealing compound from being exposed inside the light emitting tube. As a result, a reaction between the sealing compound and the sodium contained in the tubr is suppressed, thereby making it possible to obtain an electric discharge lamp having stable characteristics in which there occurs little change in the lamp voltage due to a loss of sodium or the like.
Especially in an unsaturated-type high-pressure sodium vapor lamp in which the quantity of sodium enclosed within the tube is minimum in comparision with a saturated-type high-pressure sodium vapor lamp, and is entirely evaporated when the lamp is operated, it is possible to obtain a lamp with much more stable characteristics than a conventional lamp.
Further, in the case of the first and second embodiments described above, there is an advantage that it is possible to provide an electric discharge lamp having stable characteristics without having to employ complex and costly manufacturing techniques.
Fig. 9 is a graph showing a comparison of changes in lamp voltage between a highpressure sodium vapor lamp provided with a light emitting tube construction as shown in
Figs. 1 and 4, and a high-pressure sodium vapor lamp according to an example of the present invention. In this Figure, A, B and C represent respectively the lamp voltage changes in the arrangement according to the present invention, in the arrangement shown in Fig. 4, and in the arrangement shown in
Fig. 1.
It can be uderstood from Fig. 9 that little reaction between sodium and adhesive agent in the light emitting tube occurs in the example according to the present invention.
This fact was proved also by the following experiment: After a light emitting tube having a fixed quality of sodium enclosed therein was operated for 400 hours at a temperature of 900"C, the quantity of residual sodium was measured by an atomic absorption method, with the result that it was found that about 100 micrograms of sodium was consumed in the light emitting tube of Fig. 1, about 40 micrograms in the tube of Fig. 4, and only about 1 5 micrograms in the light emitting tube according to an example of the present invention.
Claims (7)
1. A light emitting tube assembly for an electric discharge lamp, the assembly comprising a light-permeable ceramic tube having tube end walls integrally moulded at opposite ends of the tube and throughholes formed in the tube end walls, lead-in conductors having diameters slightly smaller than the diameters of the throughholes through which the lead-in conductors pass, and an annular plate fixed on an outer surface of each of the tube end walls with an adhesive agent, a part of the adhesive agent filling a gap between the annular plate and the tube end wall and only partially filling a gap between the throughhole and the lead-in conductor such that an inner end portion of the adhesive agent in the throughhole stops short of an inner surface of the tube end wall.
2. A light emitting tube assembly substantially as hereinbefore described with reference to any of the examples shown in Figs. 5 to 8 of the accompanying drawings.
3. An electric discharge lamp comprising a light emitting tube assembly according to claim 1 or claim 2.
4. A method for producing a light emitting tube assembly, the method comprising the steps of:
preparing a monolithic-type light permeable ceramic tube having tube end walls integrally moulded therewith and respective throughholes formed in the end walls;
inserting a lead-in conductor and an exhaust tube into respective ones of the throughholes and setting the lead-in conductor and the exhaust tube each at a predetermined position, the lead-in conductor and the exhaust tube having diameters slightly smaller than the diameters of the respective throughholes;;
successively fitting annularly pressuremoulded sealing compounds and annular plates made of a heat resistant material onto the lead-in conductor and the exhaust tube at respective portions of the lead-in conductor and the exhaust tube projecting outwardly from the respective tube end walls, and setting the sealing compounds and the annular plates on the respective outer surfaces of the tube end walls; and
heating and fusing the sealing compounds so as to cause the sealing compounds to fill the gaps between one of the end tube walls and the lead-in conductor, between the other one of the tube end walls and the exhaust tube, and between the respective tube end walls and the annular plates, whereby the sealing compound does not completely fill the gaps between the throughholes and the leadin conductor and the exhaust tube.
5. A method for producing a light emitting tube assembly, the method comprising the steps of:
preparing a monolithic-type permeable ceramic tube having tube end walls integrally moulded therewith and respective throughholes formed in the end walls;
inserting a lead-in conductor and an exhaust tube into respective ones of the throughholes and setting the lead-in conductor and the exhaust tube each at a predetermined position, the lead-in conductor and the exhaust tube having diameters slightly smaller than the diameters of the respective throughholes;;
successively fitting annular plates made of a heat resistant material and annularly pressuremoulded sealing compounds onto the lead-in conductor and the exhaust tube at the respective portions of the lead-in conductor and the exhaust tube projecting outwardly from the respective tube end walls, and setting the sealing compounds and the annular plates on the respective outer surfaces of the tube end walls; and
heating and fusing the sealing compounds so as to cause the sealing compounds to fill the gaps between one of the tube end walls and the lead-in conductor, between the other one of the tube end walls and the exhaust tube, and between the respective tube end walls and the annular plates, whereby the sealing compound does not completely fill the gaps between the througholes and the lead-in conductor and the exhaust tube.
6. A method according to claim 4 or claim 5, further comprising exhausting the tube, introducing a light emitting material into the tube, and sealing the tube.
7. A method for producing a light emitting tube assembly, substantially as hereinbefore described with reference to any of the examples shown in Figs. 5 to 8 of the accompanying drawings.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3619284A JPS60182652A (en) | 1984-02-29 | 1984-02-29 | High pressure metal vapor electric-discharge lamp |
| JP3619384A JPS60182653A (en) | 1984-02-29 | 1984-02-29 | Manufacture of light emitting tube |
| JP1360985A JPS61176031A (en) | 1985-01-29 | 1985-01-29 | Manufacture of luminous tube |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8505171D0 GB8505171D0 (en) | 1985-04-03 |
| GB2156147A true GB2156147A (en) | 1985-10-02 |
| GB2156147B GB2156147B (en) | 1988-05-18 |
Family
ID=27280336
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08505171A Expired GB2156147B (en) | 1984-02-29 | 1985-02-28 | Discharge lamp assembly and method of manufacture |
Country Status (4)
| Country | Link |
|---|---|
| CA (1) | CA1250887A (en) |
| DE (1) | DE3507105A1 (en) |
| FR (1) | FR2560435B1 (en) |
| GB (1) | GB2156147B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0225944A1 (en) * | 1985-11-28 | 1987-06-24 | Iwasaki Electric Co., Ltd. | Vapour discharge lamp |
| US4713580A (en) * | 1986-12-19 | 1987-12-15 | Gte Products Corporation | Sealing structure for metal vapor arc discharge lamps |
| US4892498A (en) * | 1988-02-04 | 1990-01-09 | Hoechst Ceramtec Aktiengesellschaft | Process for vacuum-tight sealing of a ceramic tube |
| US4975620A (en) * | 1985-11-28 | 1990-12-04 | Iwasaki Electric Co., Ltd. | Metal vapor discharge lamp and method of producing the same |
| EP0848407A2 (en) * | 1996-12-04 | 1998-06-17 | Matsushita Electric Works, Ltd. | Integrally molded flat compact fluorescent lamp |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1374063A (en) * | 1972-02-21 | 1974-11-13 | Philips Electronic Associated | Highpressure gas discharge lamps |
| GB1374488A (en) * | 1973-02-16 | 1974-11-20 | Gen Electric Co Ltd | Electric discharge lamps |
| GB1465212A (en) * | 1975-05-12 | 1977-02-23 | Gen Electric | Electric discharge lamps |
| WO1979000220A1 (en) * | 1977-10-20 | 1979-05-03 | Thorn Electrical Ind Ltd | Heat-resistant sealing materials |
| GB2083281A (en) * | 1980-09-05 | 1982-03-17 | Philips Nv | High-pressure discharge lamp |
| EP0087830A1 (en) * | 1982-02-26 | 1983-09-07 | Koninklijke Philips Electronics N.V. | High pressure discharge lamp |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2008087B (en) * | 1977-10-20 | 1982-12-01 | Thorn Electrical Ind Ltd | Heat-resistant sealing materials |
| US4366410A (en) * | 1980-11-21 | 1982-12-28 | Gte Laboratories Incorporated | Vacuum-tight assembly particularly for a discharge tube |
| EP0100091A3 (en) * | 1982-07-26 | 1984-10-24 | General Electric Company | Ceramic seal for high pressure sodium vapor lamps |
-
1985
- 1985-02-27 CA CA000475254A patent/CA1250887A/en not_active Expired
- 1985-02-28 FR FR8502973A patent/FR2560435B1/en not_active Expired
- 1985-02-28 GB GB08505171A patent/GB2156147B/en not_active Expired
- 1985-02-28 DE DE19853507105 patent/DE3507105A1/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1374063A (en) * | 1972-02-21 | 1974-11-13 | Philips Electronic Associated | Highpressure gas discharge lamps |
| GB1374488A (en) * | 1973-02-16 | 1974-11-20 | Gen Electric Co Ltd | Electric discharge lamps |
| GB1465212A (en) * | 1975-05-12 | 1977-02-23 | Gen Electric | Electric discharge lamps |
| WO1979000220A1 (en) * | 1977-10-20 | 1979-05-03 | Thorn Electrical Ind Ltd | Heat-resistant sealing materials |
| GB2083281A (en) * | 1980-09-05 | 1982-03-17 | Philips Nv | High-pressure discharge lamp |
| EP0087830A1 (en) * | 1982-02-26 | 1983-09-07 | Koninklijke Philips Electronics N.V. | High pressure discharge lamp |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0225944A1 (en) * | 1985-11-28 | 1987-06-24 | Iwasaki Electric Co., Ltd. | Vapour discharge lamp |
| US4827190A (en) * | 1985-11-28 | 1989-05-02 | Iwasaki Electric Co., Ltd. | Metal vapor discharge lamp and method of producing the same |
| US4975620A (en) * | 1985-11-28 | 1990-12-04 | Iwasaki Electric Co., Ltd. | Metal vapor discharge lamp and method of producing the same |
| US4713580A (en) * | 1986-12-19 | 1987-12-15 | Gte Products Corporation | Sealing structure for metal vapor arc discharge lamps |
| US4892498A (en) * | 1988-02-04 | 1990-01-09 | Hoechst Ceramtec Aktiengesellschaft | Process for vacuum-tight sealing of a ceramic tube |
| EP0848407A2 (en) * | 1996-12-04 | 1998-06-17 | Matsushita Electric Works, Ltd. | Integrally molded flat compact fluorescent lamp |
| EP0848407A3 (en) * | 1996-12-04 | 1998-07-22 | Matsushita Electric Works, Ltd. | Integrally molded flat compact fluorescent lamp |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8505171D0 (en) | 1985-04-03 |
| CA1250887A (en) | 1989-03-07 |
| GB2156147B (en) | 1988-05-18 |
| FR2560435B1 (en) | 1989-03-31 |
| DE3507105A1 (en) | 1985-10-10 |
| FR2560435A1 (en) | 1985-08-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |