GB2271117A - Low pressure mercury vapour lamp and luminescent materials therefor - Google Patents
Low pressure mercury vapour lamp and luminescent materials therefor Download PDFInfo
- Publication number
- GB2271117A GB2271117A GB9220762A GB9220762A GB2271117A GB 2271117 A GB2271117 A GB 2271117A GB 9220762 A GB9220762 A GB 9220762A GB 9220762 A GB9220762 A GB 9220762A GB 2271117 A GB2271117 A GB 2271117A
- Authority
- GB
- United Kingdom
- Prior art keywords
- per cent
- envelope
- weight
- mercury vapour
- 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.)
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
- C09K11/7766—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals
- C09K11/7774—Aluminates
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
- C09K11/7706—Aluminates
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
- C09K11/7715—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing cerium
- C09K11/7721—Aluminates
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
- C09K11/7728—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing europium
- C09K11/7734—Aluminates
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/04—Electrodes; Screens; Shields
- H01J61/06—Main electrodes
- H01J61/067—Main electrodes for low-pressure discharge lamps
- H01J61/0675—Main electrodes for low-pressure discharge lamps characterised by the material of the electrode
-
- 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
- H01J61/54—Igniting arrangements, e.g. promoting ionisation for starting
- H01J61/545—Igniting arrangements, e.g. promoting ionisation for starting using an auxiliary electrode inside the vessel
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/56—One or more circuit elements structurally associated with the lamp
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/70—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr
- H01J61/72—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr having a main light-emitting filling of easily vaporisable metal vapour, e.g. mercury
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Vessels And Coating Films For Discharge Lamps (AREA)
Abstract
Low pressure mercury vapour lamp has a rod-form starting electrode close to one of the main electrodes to reduce the starting voltage. The electrodes are of aluminium or nickel or nickel coated metal, and have surface coating of barium or strontium or calcium oxide. The discharge tube is mounted within an external envelope having the external form of a conventional incandescent lamp, and likewise the screw or push-fit connection means thereof. A ballast resistor for the lamp is located within the screw of push-fit connector. A fluorescent coating on the inner envelope comprises rare-earth elements and converts the ultra-violet frequencies to visible wavelengths. A fluorescent powder which produces visible radiation in the green wavelength may be represented as (Ce2Tb)BMg3Al40O64, formulated from a composition having the weight percent constituents: basic magnesium carbonate (5 - 15), cerium oxide (5 - 15), activated carbon (1 - 3), boric acid (0.1 - 0.3) and alumina (the balance to 100). A fluorescent powder which produces a corresponding blue-coloured radiation may be represented as Ba2MgBAl20FO34Eu4, formulated from a composition having the weight percent constituents: europium oxide (1.2 - 3.5), barium carbonate (8.8 - 26.3), barium fluoride (0.8 - 2.5), basic magnesium carbonate (5.3 - 15.9), boric acid (0.1 - 0.3), activated carbon (0.3 - 1.1) and alumina (the balance to 100).
Description
FLUORESCENT POWDERS FOR LOW PRESSURE MERCURY VAPOUR DISCHARGE
LAMPS
This invention relates to fluorescent powders for low pressure mercury vapour discharge lamps comprising a vacuum-tight and radiation-permeable envelope, and to such lamps themselves. Within the envelope there are provided spaced electrodes for connection to an electrical power source. The envelope is substantially evacuated and contains mercury vapour and an inert gas.
Prior proposals in this field include GB-B-1 452 083 and GB-B-2 003 315 and GB-B-2 050 046.
The shortcomings of prior proposals in this field include the following.
Firstly, there is a need for improvements in relation to the easy-starting of discharge lamps of this kind, whereby the not infrequently encountered uncertainty of starting and indeterminate time taken for completion of the starting process are significantly improved.
Then, there is a need for improvements in relation to safety. In the case of discharge lamps used for decorative purposes, it is usual that the power supply requirements include the use of a high voltage from a step-up transformer.
Accordingly, the installation work for such lamps needs to be carried out by qualified personnel, and necessarily involves the use with the lamp of associated safety accessories, which add to installation cost. Such lamps are considered unsafe for use in the domestic situation, due to the high voltages employed, and the relatively complex installation techniques.
A further factor concerns the appearance of the installed lamp, and its convenience of use. Whereas incandescent lamps have widely-accepted and attractive physical forms to enable their exposed use in domestic and other situations, the same cannot be said for a large proportion of low-pressure mercury vapour discharge lamps currently available, the form of the latter being dictated, at least to some extent, by the technical requirements of such lamps in relation to the provision of a sufficient length of discharge tube for visible wavelength light emission, and related factors.
Finally, there is the question of colour. We have identified a need for a mercury vapour discharge lamp and a fluorescent powder therefor, offering more attractive colours in terms of the wavelength of light emitted
Accordingly, a general object of the invention is to provide a low-pressure mercury vapour discharge lamp and/or a fluorescent powder therefor offering improvements in relation to the easy-starting of the lamp, and/or
to provide such a discharge lamp and/or a fluorescent powder therefor in which safety of use aspects of its performance are improved, notably the avoidance of the provision of relatively high voltage connections, and the avoidance of the need for technically qualified personnel to effect same; and/or to provide such a discharge lamp and/or a fluorescent powder therefor offering convenience and ease of installation; and/or
to provide such a discharge lamp in which the physical appearance of the lamp is improved, and in which the physical appearance more nearly resembles the accepted appearance of incandescent lamps; and/or
to provide a low pressure mercury vapour discharge lamp offering improvements in the colours of visible spectrum radiation emitted.
According to the invention there is provided a low pressure mercury vapour discharge lamp and a fluorescent powder therefor as defined in the accompanying claims.
In a preferred embodiment there is provided a vacuum-tight and radiation-permeable envelope. Spaced electrodes are disposed within the envelope for connection to an electrical power source. The envelope is substantially evacuated and contains mercury vapour and an inert gas.
An additional starting electrode is mounted adjacent but spaced from one of said spaced electrodes, which can be considered the cathode thereof, and is electrically connected to the other of said electrodes, which can be considered the anode thereof, through a current-limiting resistance.
The provision of such an additional starting electrode enables and facilitates easy starting of the lamp by providing a relatively short discharge path between the additional electrode and its associated main electrode, whereby a preliminary discharge is easily commenced and this facilitates the establishment of the main discharge between the more widely spaced main electrodes.
The additional electrode may be of generally rodlike form having a diameter of 0.1 to 0.6 millimetres and being located at a distance of 0.5 to 3.0 millimetres from its associated main electrode. The additional electrode may comprise aluminium or nickel or a nickel-coated metal.
In accordance with another aspect of the invention the low pressure mercury vapour discharge lamp has its vacuumtight radiation-permeable envelope contained within an outer radiation-permeable envelope which is spaced from the firstmentioned envelope to define a space between the envelopes and around a major part of the surface of the first-mentioned envelope. Connection means is provided for connecting the first-mentioned or primary envelope and its electrodes to the electrical power source, and said connection means is provided on the outer envelope and has screw or push-fit elements for this purpose.
By the provision of the outer envelope and its associated connection means, the discharge lamp can be provided with an external form meeting aesthetic requirements, such as a form similar to that of an incandescent lamp, and without compromising the technical requirements imposed on the primary radiation-permeable envelope for discharge purposes.
Moreover, the use of a screw or push-fit connection means enables the discharge lamp to be fitted in exactly the same manner as a conventional incandescent lamp.
The discharge lamp may have ballast means mounted within the confines defined by said outer radiation-permeable envelope and said connection means, the ballast means being connected in series with one of said spaced electrodes. The ballast means may provide inductive or resistive or capacitative ballast characteristics. A preferred form of the ballast means comprises a capacitor of 200 to 300 picofarads.
By providing the ballast means for the discharge lamp within the confines of its external envelope, simplicity of use and installation is greatly facilitated.
The main electrodes comprise aluminium or nickel or a nickel alloy having a layer of barium oxide or strontium oxide or calcium oxide thereon.
In order to produce radiation within the visible wavelength range, there is provided, as a coating on the inner radiation-permeable envelope, a fluorescent powder coating.
This powder coating may be represented as (Ce2Tb)BMg3Al40O.
This composition is formulated from a composition having the weight percentage constituents indicated below, and produces visible radiation in the green wavelength range :
a) Basic magnesium carbonate (5 - 15 per cent)
b) Cerium Oxide (5 - 15 per cent)
c) Activated carbon (1 - 3 per cent)
d) Boric Acid (0.1 - 0.3 per cent)
e) Alumina (balance to 100 per cent).
The above constituents are processed, as more fully described below, by mixing and milling and heating in a muffler.
For a corresponding blue-coloured radiation, the fluorescent powder may be represented as Ba2MgBAl20FO34En4 and is formulated from the following constituents :
a) Europium Oxide (1.2 - 3.5 per cent)
b) Barium Carbonate (8.8 - 26.3 per cent)
c) Barium Fluoride (0.8 - 2.5 per cent)
d) Basic magnesium carbonate (5.3 - 15.9 per cent)
e) Boric Acid (0.1 - 0.3 per cent)
f) activated carbon (0.3 - 1.1 per cent)
g) Alumina (balance to 100 per cent).
Alternative fluorescent compositions may produce a variety of other soft and bright-coloured lights including red, yellow, purple, white etc. In the embodiment, a specially-designed cold cathode is used in association with the fluorescent powder and produces a service life of about ten thousand hours. The lamp uses international lamp bases
E27, B22 or E14, which can be easily manually inserted into widely available lamp sockets at 220 or 110 volts, or thereabouts.
The vacuum-tight and radiation-permeable envelope contains argon and/or neon in association with the mercury vapour. The radiation thus produced is mainly in the ultraviolet spectrum at about 253.7 nm. The proportions of argon and neon and mercury used are chosen to minimise the starting voltage in accordance with the "panning" effect.
In the embodiment, the additional starting electrode has a current limiting resistance connected in series therewith. The pressure within the envelope is from 2 to 4 torr, preferably 3 torr. The amount of mercury vapour used, per envelope, is 3 to 8 milligrams.
The ballast means used in the cathode circuit of the lamp is preferably a capacitor of 200 to 330 picofarads, in view of its small size and low power loss. Alternatively, an inductance, or a resistor (for example transparent tin chloride SnCl4) may be employed.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig 1 shows a first embodiment of the low-pressure mercury vapour discharge lamp, together with the associated supply circuit;
Fig 2 shows a second embodiment, corresponding to the first;
Figs 3, 4,5 and 6 show elevation views of four embodiments of the invention in which the discharge tube is incorporated into an external envelope having the form of a globe (Fig 3), a pear (Fig 4), a candle (Fig 5) and a column (Fig 6).
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Preferred embodiments of the invention will now be explained with reference to the accompanying drawings.
As shown in Fig 1, a low-pressure mercury vapour discharge lamp 10 for connection to an alternating current power source 12 having a voltage V comprises a vacuum-tight and radiation-permeable envelope 14. Spaced electrodes 16, 18 are disposed within the envelope and connected to power source 12 through conductors 20, 22, 24, and an external conductive coating 26 on envelope 14.
Coating 26 comprises transparent SNcl4 providing a ballast resistor for the lamp 10 (corresponding to ballast means 34 in Fig 2, described below).
There is provided close to electrode 16, an additional starting electrode 28. Electrode 28 is of pure aluminium or nickel or a nickel-coated metal and of diameter 0.1 to 0.6 millimetres and located at a distance of 0.5 to 3.0 millimetres from electrode 16. Starting electrode 28 is connected to conductor 24 through a ballast resistor Ra.
Envelope 14 is largely evacuated and contains argon or neon together with an amount of mercury vapour of from 3 to 8 milligrams. The pressure within the envelope is 3 torr.
The envelope 14 is coated with a fluorescent powder layer. Details of this layer are as follows.
Manufacture of the fluorescent powders will now be described.
The formulation of a fluorescent powder producing wavelengths in the green range comprises :
1 Alumina 1000.
2 Terbium oxide 76.
3 Cerium oxide 148.
4 Basic magnesium carbonate 156.
5 Boric acid 3.
6 Activated carbon 30.
Items 1 to 5 above are mixed and milled and placed in an alundum crucible. The activated carbon is placed in another wide mouthed crucible. Both crucibles are heated in a muffle furnace to 1500 degrees celsius for a eight hours in a weekly reducing atmosphere. After cooling to 800 degrees celsius, the mixture is shattered and ground in a ball crusher at 30 rpm pm for 20 hours. The mixture is then screened at 200 mesh, ultrasonically treated, dried and packaged.
In the case of a fluorescent powder producing blue radiation in the visible spectrum, the formulation comprises
1 Alumina 1000.
2 Europium oxide 34.5.
3 Barium carbonate 261.
4 Barium fluoride 25.8.
5 Basic magnesium carbonate 158.
6 Boric acid 3.
7 Activated carbon 10.
The production technique is similar to that described above for the fluorescent powder which produces green light.
The main electrodes 16, 18 are of pure aluminium or nickel or a nickel alloy having a coating of barium oxide, strontium oxide or calcium oxide, or a mixture of these.
In the embodiment of Fig 2, starting electrode 28 is connected to main electrode 18 directly via a discrete ballast resistor Ra and conductor 32, instead of via coating 26.
There is also shown in Fig 2 the ballast means 34, which may be capacitative, inductive or resistive. It is provided in series with electrode 16 in conductor 20.
Otherwise, this embodiment is constructed and operates as described above.
There is also shown in Fig 2 the overall height "H" and the overall width "W" of envelope 14. These quantities are set out in the accompanying chart, Fig 7.
Figs 3 to 6 show the lamp 10 of Fig 1 (or the lamp 36 of Fig 2) installed within variously-shaped outer envelopes 38, 40, 42 and 44. These are globe, pear, candle and columnshaped, respectively.
Each of the lamps of Figs 3 to 6 has connection means 46 provided at the base of its outer envelope, for cooperation with a screw-threaded lamp holder (not shown). As shown in Figs 6, an alternative push-fit connection means 48 may be provided for any of the lamps of Figs 3 to 6.
Ballast means 34 of each lamp is located within the connection means 46, 48 of the lamp, thereby conveniently housing this otherwise vulnerable component, which would have safety implications if exposed.
Fig 7 provides a tabulation of data relating to various embodiments of the above lamps. Five embodiments are shown which are operational at 220 volts ac supply, and likewise five embodiments at 110 volts ' ac supply. The tabulation shows the voltage applied to the lamp, the resistance Ra, the capacitance (C) or resistance (R) of the ballast means 34, and the overall lamp current (I) in milliamps.
In use, these lamps provide a convenient and easilystarted discharge lamp offering a great variety of soft and bright-coloured lights. Safety requirements are met and the product has the convenience and aesthetic qualities of the widely accepted incandescent lamps.
Claims (10)
1 A fluorescent powder for a low pressure mercury vapour discharge lamp formulated from :
a) Basic magnesium carbonate (5 to 15 per cent by weight).
b) Cerium oxide (5 to 15 per cent by weight).
c) Activated carbon (l to 3 per cent by weight).
d) Boric Acid (0.1 to 0.3 per cent by weight).
e) Alumina (the balance to 100 per cent); said fluorescent powder being produced by a process comprising mixing and heating in a furnace the above-mentioned constituents.
2 A fluorescent powder for a low pressure mercury vapour discharge lamp formulated from :
a) europium oxide (1.2 to 3.5 per cent by weight)
b) barium carbonate (8.8 to 26.3 per cent by weight)
c) barium fluoride (0.8 to 2.5 per cent by weight;
d) basic magnesium carbonate (5.3 to 15.9 per cent) by weight
e) boric acid (0.1 to 03 per cent by weight)
f) activated carbon (0.3 to 1.1 per cent by weight)
g) alumina (balance to 100 per cent).
said fluorescent powder being produced by a process comprising mixing and heating in a furnace the above-mentioned constituents.
3 A fluorescent powder for a low pressure mercury vapour discharge lamp comprising :
a) a rare earth oxide (1.2 to 15 per cent by weight);
b) basic magnesium carbonate (5 to 16 per cent) by weight;
c) boric acid (0.1 to 0.3 per cent by weight);
d) activated carbon (0.1 to 3.0 per cent by weight);
e) alumina (balance to 100 per cent) said fluorescent powder being produced by a process comprising mixing and heating in a furnace the above-mentioned constituents.
4 A low pressure mercury vapour discharge lamp comprising a fluorescent powder according to any one of claims 1 to 3.
5 A low pressure mercury vapour discharge lamp comprising :
a) a vacuum-tight and radiation-permeable envelope;
b) spaced electrodes disposed within said envelope for connection to an electrical power source;
c) said envelope being substantially evacuated and containing mercury vapour and an inert gas;
characterised by
d) an additional starting electrode mounting adjacent but spaced from one of said electrodes, and electrically connected to the other electrode through a current limiting resistance.
6 The discharge lamp of claim 5 characterised by said additional electrode being generally of rod-like form, of diameter 0.1 to 0.6 millimetres and located at a distance of 0.5 to 3.0 millimetres from said one of said electrodes, and comprising aluminium or nickel or a nickel-coated metal.
7 A low pressure mercury vapour discharge lamp comprising :
a) a vacuum-tight and radiation-permeable envelope;
b) spaced electrodes disposed within said envelope for connection to an electrical power source;
c) said envelope being substantially evacuated and containing mercury vapour and an inert gas;
characterised by
d) said envelope being contained within an outer radiation-permeable envelope spaced from said vacuum-tight radiation-permeable envelope to define a space around a major part of the external surface of said vacuum-tight envelope;
e) connection means for connecting said spaced electrodes to said power source, said connection means being provided on said outer envelope and having screw or push-fit elements for this purpose.
8 The discharge lamp of claim 7 characterised by ballast means mounted within the confines of said outer radiation permeable envelope and of said connection means, and said ballast means being connected in series with one of said spaced electrodes, and said ballast means being selected from the group consisting of inductive and resistive and capacitative elements.
9 The discharge tube of claim 8 characterised by said ballast means comprising a capacitor of 200 to 330 picofarads.
10 The discharge lamp of claim 8 characterised by said main electrodes comprising aluminium or nickel or a nickel alloy coated with a layer of an oxide selected from the group consisting of barium oxide, strontium oxide, and calcium oxide.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9220762A GB2271117A (en) | 1992-10-02 | 1992-10-02 | Low pressure mercury vapour lamp and luminescent materials therefor |
| FI925119A FI925119A (en) | 1992-10-02 | 1992-11-11 | Fluorescerande Pulver Foer kvicksilverurladdningslampor med laogtryck |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9220762A GB2271117A (en) | 1992-10-02 | 1992-10-02 | Low pressure mercury vapour lamp and luminescent materials therefor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9220762D0 GB9220762D0 (en) | 1992-11-18 |
| GB2271117A true GB2271117A (en) | 1994-04-06 |
Family
ID=10722859
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9220762A Withdrawn GB2271117A (en) | 1992-10-02 | 1992-10-02 | Low pressure mercury vapour lamp and luminescent materials therefor |
Country Status (2)
| Country | Link |
|---|---|
| FI (1) | FI925119A (en) |
| GB (1) | GB2271117A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0694952A2 (en) * | 1994-07-30 | 1996-01-31 | Schiller, Christa | Compact fluorescent lamp with incandescent lamp socket, in particular with socket thread of the E27 or E14 type |
| EP0934683A1 (en) * | 1996-10-16 | 1999-08-11 | Tapeswitch Corporation | Inductive-resistive fluorescent apparatus and method |
| EP1193735A1 (en) * | 2000-09-28 | 2002-04-03 | Toshiba Lighting & Technology Corporation | High pressure discharge lamp and lighting apparatus using the lamp |
| EP1357610A1 (en) * | 2001-01-24 | 2003-10-29 | Nichia Corporation | Light emitting diode, optical semiconductor elemet and epoxy resin composition suitable for optical semiconductor element and production methods therefor |
| WO2014009414A1 (en) * | 2012-07-11 | 2014-01-16 | Centre National De La Recherche Scientifique (Cnrs) | Glow-discharge lamp |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1482301A (en) * | 1974-01-08 | 1977-08-10 | Philips Electronic Associated | Low pressure mercury vapour discharge lamp |
| US4258285A (en) * | 1979-06-22 | 1981-03-24 | Gte Products Corporation | Two-component phosphor in a cool white lamp |
| US4847533A (en) * | 1986-02-05 | 1989-07-11 | General Electric Company | Low pressure mercury discharge fluorescent lamp utilizing multilayer phosphor combination for white color illumination |
-
1992
- 1992-10-02 GB GB9220762A patent/GB2271117A/en not_active Withdrawn
- 1992-11-11 FI FI925119A patent/FI925119A/en not_active Application Discontinuation
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1482301A (en) * | 1974-01-08 | 1977-08-10 | Philips Electronic Associated | Low pressure mercury vapour discharge lamp |
| US4258285A (en) * | 1979-06-22 | 1981-03-24 | Gte Products Corporation | Two-component phosphor in a cool white lamp |
| US4847533A (en) * | 1986-02-05 | 1989-07-11 | General Electric Company | Low pressure mercury discharge fluorescent lamp utilizing multilayer phosphor combination for white color illumination |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0694952A2 (en) * | 1994-07-30 | 1996-01-31 | Schiller, Christa | Compact fluorescent lamp with incandescent lamp socket, in particular with socket thread of the E27 or E14 type |
| EP0694952A3 (en) * | 1994-07-30 | 1998-03-18 | Schiller, Christa | Compact fluorescent lamp with incandescent lamp socket, in particular with socket thread of the E27 or E14 type |
| EP0934683A1 (en) * | 1996-10-16 | 1999-08-11 | Tapeswitch Corporation | Inductive-resistive fluorescent apparatus and method |
| EP0934683A4 (en) * | 1996-10-16 | 2002-01-09 | Tapeswitch Corp | Inductive-resistive fluorescent apparatus and method |
| EP1193735A1 (en) * | 2000-09-28 | 2002-04-03 | Toshiba Lighting & Technology Corporation | High pressure discharge lamp and lighting apparatus using the lamp |
| EP1357610A1 (en) * | 2001-01-24 | 2003-10-29 | Nichia Corporation | Light emitting diode, optical semiconductor elemet and epoxy resin composition suitable for optical semiconductor element and production methods therefor |
| EP1357610A4 (en) * | 2001-01-24 | 2006-08-02 | Nichia Corp | Light emitting diode, optical semiconductor elemet and epoxy resin composition suitable for optical semiconductor element and production methods therefor |
| US7342357B2 (en) | 2001-01-24 | 2008-03-11 | Nichia Corporation | Light emitting diode, optical semiconductor device, epoxy resin composition suited for optical semiconductor device, and method for manufacturing the same |
| SG145544A1 (en) * | 2001-01-24 | 2008-09-29 | Nichia Corp | Light emitting diode, optical semiconductor device, epoxy resin composition suited for optical semiconductor device, and method for manufacturing the same |
| US7550096B2 (en) | 2001-01-24 | 2009-06-23 | Nichia Corporation | Light emitting diode, optical semiconductor device, epoxy resin composition and phosphor suited for optical semiconductor device, and method for manufacturing the same |
| WO2014009414A1 (en) * | 2012-07-11 | 2014-01-16 | Centre National De La Recherche Scientifique (Cnrs) | Glow-discharge lamp |
| US9485848B2 (en) | 2012-07-11 | 2016-11-01 | Universite Joseph Fourier—Grenoble 1 | Glow discharge lamp |
Also Published As
| Publication number | Publication date |
|---|---|
| FI925119A (en) | 1994-04-03 |
| FI925119A0 (en) | 1992-11-11 |
| GB9220762D0 (en) | 1992-11-18 |
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