EP0000966A1 - Low-pressure mercury vapour discharge lamp - Google Patents
Low-pressure mercury vapour discharge lamp Download PDFInfo
- Publication number
- EP0000966A1 EP0000966A1 EP78200124A EP78200124A EP0000966A1 EP 0000966 A1 EP0000966 A1 EP 0000966A1 EP 78200124 A EP78200124 A EP 78200124A EP 78200124 A EP78200124 A EP 78200124A EP 0000966 A1 EP0000966 A1 EP 0000966A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- lamp
- low
- cylindrical body
- pressure mercury
- discharge lamp
- 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
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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
Definitions
- the invention relates to a low-pressure mercury vapour discharge lamp comprising at least one U-shaped discharge tube.
- German patent specification 837.892 describes such a lamp as being suitable for use in luminaires for incandescent lamps for general illumination purposes.
- the U-shaped discharge tube is enclosed by an outer bulb which is in the form of an envelope of an incandescent lamp, the lamp base being of a type customary for incandescent lamps.
- an inductive stabilisation ballast is present in the lamp base.
- a drawback of the lamp described in the above-mentioned German patent specification is, that, by enclosing the U-shaped discharge tube in an outer bulb, the temperature in the discharge tube increases to such a value that the critical vapour pressure for an optimum conversion of electric power into ultra-violet radiation can easily be exceeded.As a consequence the efficiency of the lamp and the electric power consumed by the lamp decrease.
- a low-pressure discharge lamp of the type mentioned in the preamble is characterized in accordance with the invention, that the lamp comprises an at least for the greater part cylindrical body having recesses, wherein at least each of the legs of the discharge tube are accommodated over its circumference over an angle of at least 150°.
- a lamp according to the invention is easy to handle owing to its cylindrical geometry.
- a suitable lamp base in which a glow discharge starter and an electric stabilisation ballast are disposed such a lamp can be used for screwing into luminaires for incandescent lamps for general illumination purposes.
- the force which is exercised on the discharge tube itself during screwing is low; this force is, namely, absorbed by the cylindrical body.
- the temperature in the discharge tube is adversely affected to the least possible degree because a relatively large portion of the discharge tube wall is in contact with the cool environment.
- the cylindrical body is preferably transmissive to light; the loss of light is low then.
- the cylindrical body consists, for example, of a solid transparent synthetic resin material, such as polished "Perspex" (trade name). In such a cylindrical body the recesses for the discharge tube can be applied in a simple manner.
- the cylindrical body is hollow.
- the wall of such a hollow cylindrical body consists, for example, of a synthetic resin material; the hollow body can be produced in a simple manner by moulding or injection moulding by means of a mould.
- the light output of a lamp according to the invention can be increased by providing the wall of the recesses in the cylindrical body, which faces the discharge tube, with a reflecting layer.
- a reflecting layer is a vacuum-deposited metal layer, such as aluminium.
- Lamps according to the invention are an excellent alternative for incandescent lamps.
- the dimensions of lamps according to the invention are substantially the same as those of incandescent lamps but, in addition, the efficiency of the discharge lamps is a few times greater.
- a colour temperature can be achieved with low-pressure mercury vapour discharge lamps according to the invention which is equal to that of the incandescent lamp; this makes the use of the small discharge lamps according to the invention attractive for use in living rooms.
- a low-pressure mercury vapour discharge lamp is indicated by 1.
- This lamp comprises a cylindrical solid body 2, consisting of a suitable transparent synthetic resin material, such as, for example, polished "Perspex" (trade name).
- the cylindrical body 2 comprises two diametrically opposite recesses 3 and 4 respectively (see figure 3) which extend into the longitudinal direction and in which the legs 5 and 6 respectively of the U-shaped discharge tube are accommodated over a circumference over an angle of approximately 200°.
- the bent portion 7 of the discharge tube is also accommodated in a recess in the cylindrical body.
- the electrodes 8 and 9 are disposed at the ends of the legs of the discharge tube.
- the inner wall of the discharge tube is provided with a luminescent coating 10 (see figure 3), consisting of a mixture of phosphors, namely blue luminescent bivalent europium-activated barium magnesium aluminate, green luminescent terbium-activated cerium magnesium aluminate and red luminescent trivalent europium-activated yttrium oxide.
- the tube is filled with mercury vapour and a rare gas or combination of rare gases.
- the end of the lamp comprises a lamp base 11, which is provided with a sleeve 12 with screwthread.
- the cylindrical body is secured to this lamp base by means of a glue.
- An inductive stabilisation element can be disposed in the lamp base.
- a glow discharge starter in the sleeve or in the lamp base.
- the length of the entire lamp, so including the lamp base, is approximately 18 cm.
- the diameter or the lamp, that is to say the diameter of the cylindrical body is approximately 3.5 cm.
- the inside diameter of the discharge tube is approximately 1.0 cm. At an applied power of 10 V and an argon pressure of 3 torr the total luminous flux of the lamp is 750 1m.
- Figure 3 shows a cross-section of a lamp shown in figure 1.
- the numerals refer to the same components as in figure 1.
- FIG. 4 shows a cross-section of an embodiment of a low-pressure mercury vapour discharge lamp according to the invention wherein the cylindrical body 13, in which the U-shaped discharge tube is disposed, is hollow.
- the wall consists of a synthetic resin material, which, for example, contains a polycarbonate.
- the wall thickness is approximately 2 mm.
- the legs of the U-shaped discharge tube are indicated by 14 and 15.
- the inner sides of the wall of the recesses 16 and 17 which face the discharge tube are coated with a layer of reflective material 18 and 19 respectively, such as a vacuum-deposited aluminium layer.
- the reflecting layer can also be used for facilitating starting of the lamp.
- a stabilisation element and/or a glow discharge starter can be disposed in the hollow room within the cylindrical body.
- a rod or tube, whose wall is provided with reflecting material in the hollow part of the cylindrical body instead of reflecting layers 18 and 19.
- the dimensions of the lamp are the same as of the lamp shown in figures 1 and 2.
- FIG. 5 shows a cross-section of a low-pressure mercury vapour discharge lamp according to the invention, wherein a hollow or solid cylindrical body 20 has four recesses, for accommodating two U-shaped discharge tubes, the legs of which are indicated by 21 and 22 and 23 and 24 respectively.
- the U-shaped discharge tubes can, for example, be electrically arranged in series with one stabilisation element. In this manner a lamp is obtained which has a uniform light distribution.
Landscapes
- Vessels And Coating Films For Discharge Lamps (AREA)
- Common Detailed Techniques For Electron Tubes Or Discharge Tubes (AREA)
Abstract
Description
- The invention relates to a low-pressure mercury vapour discharge lamp comprising at least one U-shaped discharge tube.
- German patent specification 837.892 describes such a lamp as being suitable for use in luminaires for incandescent lamps for general illumination purposes. In this German patent specification the U-shaped discharge tube is enclosed by an outer bulb which is in the form of an envelope of an incandescent lamp, the lamp base being of a type customary for incandescent lamps. In this prior art lamp an inductive stabilisation ballast is present in the lamp base. A drawback of the lamp described in the above-mentioned German patent specification is, that, by enclosing the U-shaped discharge tube in an outer bulb, the temperature in the discharge tube increases to such a value that the critical vapour pressure for an optimum conversion of electric power into ultra-violet radiation can easily be exceeded.As a consequence the efficiency of the lamp and the electric power consumed by the lamp decrease.
- It is an object of the invention to provide a low-pressure mercury vapour discharge lamp which does not have the above-mentioned drawbacks.
- A low-pressure discharge lamp of the type mentioned in the preamble is characterized in accordance with the invention, that the lamp comprises an at least for the greater part cylindrical body having recesses, wherein at least each of the legs of the discharge tube are accommodated over its circumference over an angle of at least 150°.
- A lamp according to the invention is easy to handle owing to its cylindrical geometry. Provided with a suitable lamp base in which a glow discharge starter and an electric stabilisation ballast are disposed such a lamp can be used for screwing into luminaires for incandescent lamps for general illumination purposes. When accommodating the discharge tube over its circumference over an angle exceeding 1500 the force which is exercised on the discharge tube itself during screwing is low; this force is, namely, absorbed by the cylindrical body. It is also possible to secure the cylindrical body to the lamp base by means of a suitable glue. So the risk of fracturing of the discharge tube is small. Furthermore, in a lamp according to the invention the temperature in the discharge tube is adversely affected to the least possible degree because a relatively large portion of the discharge tube wall is in contact with the cool environment.
- The cylindrical body is preferably transmissive to light; the loss of light is low then. The cylindrical body consists, for example, of a solid transparent synthetic resin material, such as polished "Perspex" (trade name). In such a cylindrical body the recesses for the discharge tube can be applied in a simple manner.
- In a further embodiment of the lamp according to the invention the cylindrical body is hollow. This has the advantage that the weight of the lamp is as low as possible. In addition, there is room in the body for applying an inductive stabilisation element and/or a glow discharge starter. In that case it is not necessary to provide additional provisions in the incandescent lamp luminaire itself for said electric units. The wall of such a hollow cylindrical body consists, for example, of a synthetic resin material; the hollow body can be produced in a simple manner by moulding or injection moulding by means of a mould.
- The light output of a lamp according to the invention can be increased by providing the wall of the recesses in the cylindrical body, which faces the discharge tube, with a reflecting layer. An example of such a layer is a vacuum-deposited metal layer, such as aluminium.
- Lamps according to the invention are an excellent alternative for incandescent lamps. For, not only the dimensions of lamps according to the invention are substantially the same as those of incandescent lamps but, in addition, the efficiency of the discharge lamps is a few times greater. By a suitable choice of the luminescent material a colour temperature can be achieved with low-pressure mercury vapour discharge lamps according to the invention which is equal to that of the incandescent lamp; this makes the use of the small discharge lamps according to the invention attractive for use in living rooms.
- The invention will be further explained with reference to a drawing.
- In the drawing figure 1 shows an embodiment of a low-pressure mercury vapour discharge lamp according to the invention, and
- figure 2 shows a perspective view of an upper portion of the lamp shown in figure 1 and
- figure 3 shows a cross-section of a lamp shown in figure 1.
- Figure 4 shows a cross-section of a low-pressure mercury vapour discharge lamp according to the invention, the body being hollow.
- Figure 5 shows an embodiment of a low-pressure mercury vapour discharge lamp wherein two U-shaped discharge tubes are disposed in the cylindrical body.
- In figures 1 and 2 a low-pressure mercury vapour discharge lamp is indicated by 1. This lamp comprises a cylindrical
solid body 2, consisting of a suitable transparent synthetic resin material, such as, for example, polished "Perspex" (trade name). Thecylindrical body 2 comprises two diametrically opposite recesses 3 and 4 respectively (see figure 3) which extend into the longitudinal direction and in which thelegs electrodes 8 and 9 are disposed at the ends of the legs of the discharge tube. The inner wall of the discharge tube is provided with a luminescent coating 10 (see figure 3), consisting of a mixture of phosphors, namely blue luminescent bivalent europium-activated barium magnesium aluminate, green luminescent terbium-activated cerium magnesium aluminate and red luminescent trivalent europium-activated yttrium oxide. The tube is filled with mercury vapour and a rare gas or combination of rare gases. The end of the lamp comprises alamp base 11, which is provided with asleeve 12 with screwthread. The cylindrical body is secured to this lamp base by means of a glue. An inductive stabilisation element can be disposed in the lamp base. Furthermore, there is the possibility of fitting a glow discharge starter in the sleeve or in the lamp base. The length of the entire lamp, so including the lamp base, is approximately 18 cm. The diameter or the lamp, that is to say the diameter of the cylindrical body is approximately 3.5 cm. The inside diameter of the discharge tube is approximately 1.0 cm. At an applied power of 10 V and an argon pressure of 3 torr the total luminous flux of the lamp is 750 1m. - Figure 3 shows a cross-section of a lamp shown in figure 1. The numerals refer to the same components as in figure 1.
- Figure 4 shows a cross-section of an embodiment of a low-pressure mercury vapour discharge lamp according to the invention wherein the
cylindrical body 13, in which the U-shaped discharge tube is disposed, is hollow. The wall consists of a synthetic resin material, which, for example, contains a polycarbonate. The wall thickness is approximately 2 mm. The legs of the U-shaped discharge tube are indicated by 14 and 15. The inner sides of the wall of therecesses reflective material layers 18 and 19.The dimensions of the lamp are the same as of the lamp shown in figures 1 and 2. - Figure 5 shows a cross-section of a low-pressure mercury vapour discharge lamp according to the invention, wherein a hollow or solid
cylindrical body 20 has four recesses, for accommodating two U-shaped discharge tubes, the legs of which are indicated by 21 and 22 and 23 and 24 respectively. The U-shaped discharge tubes can, for example, be electrically arranged in series with one stabilisation element. In this manner a lamp is obtained which has a uniform light distribution.
Claims (5)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL7709266 | 1977-08-23 | ||
NL7709266A NL7709266A (en) | 1977-08-23 | 1977-08-23 | LOW-PRESSURE MERCURY DISCHARGE LAMP. |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0000966A1 true EP0000966A1 (en) | 1979-03-07 |
EP0000966B1 EP0000966B1 (en) | 1980-08-06 |
Family
ID=19829055
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP78200124A Expired EP0000966B1 (en) | 1977-08-23 | 1978-07-31 | Low-pressure mercury vapour discharge lamp |
Country Status (7)
Country | Link |
---|---|
US (1) | US4208604A (en) |
EP (1) | EP0000966B1 (en) |
JP (1) | JPS5442873A (en) |
CA (1) | CA1119234A (en) |
DE (1) | DE2860118D1 (en) |
IT (2) | IT1098162B (en) |
NL (1) | NL7709266A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3027535A1 (en) * | 1979-08-15 | 1981-03-26 | N.V. Philips' Gloeilampenfabrieken, Eindhoven | LOW PRESSURE DISCHARGE LAMP |
EP0044195A1 (en) * | 1980-07-11 | 1982-01-20 | Kabushiki Kaisha Toshiba | Compact fluorescent lamp arrangement |
EP0062713A1 (en) * | 1981-04-10 | 1982-10-20 | Kabushiki Kaisha Toshiba | A method of manufacturing a fluorescent lamp and a fluorescent lamp obtained by this method |
Families Citing this family (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4300073A (en) * | 1979-02-13 | 1981-11-10 | Westinghouse Electric Corp. | Screw-in type lighting unit having a convoluted tridimensional fluorescent lamp |
JPS5638765A (en) * | 1979-09-04 | 1981-04-14 | Toshiba Electric Equip Corp | Electric discharge lamp device |
US4347460A (en) * | 1980-03-03 | 1982-08-31 | Gte Products Corporation | Compact fluorescent lamp assembly |
JPS5999652A (en) * | 1982-11-29 | 1984-06-08 | Matsushita Electronics Corp | Fluorescent lamp with single-ended base |
JPS59103266A (en) * | 1982-12-06 | 1984-06-14 | Mitsubishi Electric Corp | Discharge lamp |
US4575344A (en) * | 1983-04-01 | 1986-03-11 | Gte Products Corporation | Metal arc director for compact fluorescent lamp |
US4495443A (en) * | 1984-01-27 | 1985-01-22 | Cummings John H | Compact fluorescent lamp combination, and method of making it |
US4521837A (en) * | 1984-06-20 | 1985-06-04 | Gte Products Corporation | Compact fluorescent lamp having increased light output |
US4683402A (en) * | 1985-04-25 | 1987-07-28 | Truman Aubrey | Adaptors for fluorescent lamps |
JPH0331516Y2 (en) * | 1985-07-08 | 1991-07-04 | ||
JPS6257367U (en) * | 1985-09-30 | 1987-04-09 | ||
US4733123A (en) * | 1986-10-14 | 1988-03-22 | Gte Products Corporation | Diffuser for an arc discharge lamp |
US4754197A (en) * | 1986-10-14 | 1988-06-28 | Gte Products Corporation | Arc discharge lamp assembly simulating gaslight |
DE29518894U1 (en) * | 1995-11-30 | 1996-01-25 | Holzer Walter Prof Dr H C Ing | Compact fluorescent lamp with reflector |
USD382081S (en) * | 1996-02-07 | 1997-08-05 | Moriyama Sangyo Kabushiki Kaisha | Decorative lamp |
US6796677B1 (en) | 1999-07-23 | 2004-09-28 | Everbrite, Inc. | High intensity lamp |
DE102005019113A1 (en) * | 2005-04-25 | 2006-10-26 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Halogen incandescent lamp and method for its production |
TWI374990B (en) * | 2009-06-16 | 2012-10-21 | Wellypower Optronics Corp | Lamp device and frame |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE837892C (en) * | 1950-06-14 | 1952-05-02 | Dominitwerke | Fluorescent or mercury vapor lamp in the form of an ordinary incandescent lamp |
GB861122A (en) * | 1957-02-22 | 1961-02-15 | Gen Electric Co Ltd | Improvements in or relating to sodium vapour electric discharge lamps |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US673277A (en) * | 1898-11-08 | 1901-04-30 | Jules Edgard De Marcay | Incandescent electric lamp. |
US1774842A (en) * | 1928-07-07 | 1930-09-02 | Thomas K Peters | Beacon light |
US1857120A (en) * | 1930-05-29 | 1932-05-03 | Transom Frederick | Projector lamp |
US1870147A (en) * | 1931-04-02 | 1932-08-02 | Emanuel C Smally | Illuminating device |
US3775609A (en) * | 1972-08-07 | 1973-11-27 | Litton Business Systems Inc | Lamp arrangement |
US3953761A (en) * | 1974-04-03 | 1976-04-27 | Thomas Lo Giudice | Fluorescent light bulb for use in conventional incandescent bulb fixture |
-
1977
- 1977-08-23 NL NL7709266A patent/NL7709266A/en not_active Application Discontinuation
-
1978
- 1978-07-31 EP EP78200124A patent/EP0000966B1/en not_active Expired
- 1978-07-31 DE DE7878200124T patent/DE2860118D1/en not_active Expired
- 1978-08-15 CA CA000309397A patent/CA1119234A/en not_active Expired
- 1978-08-18 IT IT26851/78A patent/IT1098162B/en active
- 1978-08-18 US US05/934,684 patent/US4208604A/en not_active Expired - Lifetime
- 1978-08-18 IT IT7822588U patent/IT7822588V0/en unknown
- 1978-08-21 JP JP10099978A patent/JPS5442873A/en active Granted
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE837892C (en) * | 1950-06-14 | 1952-05-02 | Dominitwerke | Fluorescent or mercury vapor lamp in the form of an ordinary incandescent lamp |
GB861122A (en) * | 1957-02-22 | 1961-02-15 | Gen Electric Co Ltd | Improvements in or relating to sodium vapour electric discharge lamps |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3027535A1 (en) * | 1979-08-15 | 1981-03-26 | N.V. Philips' Gloeilampenfabrieken, Eindhoven | LOW PRESSURE DISCHARGE LAMP |
EP0044195A1 (en) * | 1980-07-11 | 1982-01-20 | Kabushiki Kaisha Toshiba | Compact fluorescent lamp arrangement |
EP0062713A1 (en) * | 1981-04-10 | 1982-10-20 | Kabushiki Kaisha Toshiba | A method of manufacturing a fluorescent lamp and a fluorescent lamp obtained by this method |
Also Published As
Publication number | Publication date |
---|---|
JPS6131591B2 (en) | 1986-07-21 |
NL7709266A (en) | 1979-02-27 |
US4208604A (en) | 1980-06-17 |
DE2860118D1 (en) | 1980-11-27 |
JPS5442873A (en) | 1979-04-05 |
EP0000966B1 (en) | 1980-08-06 |
IT1098162B (en) | 1985-09-07 |
CA1119234A (en) | 1982-03-02 |
IT7826851A0 (en) | 1978-08-18 |
IT7822588V0 (en) | 1978-08-18 |
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