EP0359200A2 - Lampe à décharge à halogénures métalliques à rendu de couleurs amélioré - Google Patents
Lampe à décharge à halogénures métalliques à rendu de couleurs amélioré Download PDFInfo
- Publication number
- EP0359200A2 EP0359200A2 EP89116864A EP89116864A EP0359200A2 EP 0359200 A2 EP0359200 A2 EP 0359200A2 EP 89116864 A EP89116864 A EP 89116864A EP 89116864 A EP89116864 A EP 89116864A EP 0359200 A2 EP0359200 A2 EP 0359200A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- metal halide
- accordance
- arc tube
- discharge lamp
- 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
- H01J61/82—Lamps with high-pressure unconstricted discharge having a cold pressure > 400 Torr
- H01J61/827—Metal halide arc lamps
-
- 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
Definitions
- the present invention relates to high intensity discharge lamps and more particularly metal halide discharge lamps having warm color, high luminous efficacy, and good color rendering properties.
- Metal halide lamps of the intermediate and high wattage variety e.g., 175 to 1500 watts, provide efficacy, color temperature, and a color rendering index (CRI) which meets most higher wattage commercial lighting needs.
- CRI color rendering index
- low wattage metal halide lamps e.g., less than 175 watts, however, produce light of a lower CRI than the intermediate and higher wattage variety metal halide discharge lamps.
- low wattage metal halide lamps having good efficacy and warm color temperature have been disclosed, such lamps typically have a lower CRI than is desirable for many commercial lighting applications, i.e., such lamps have a CRI of 65 or less.
- U.S. Patent No. 4,709,184 issued to Keeffe et al. on November 24, 1987, entitled Low Wattage Metal Halide Lamp.
- these lamps are not suitable for use in low wattage commercial lighting applications requiring a CRI of about 70 or higher.
- a low wattage metal halide lamp having improved CRI.
- the low wattage metal halide discharge lamp of the present invention comprises an outer sealed glass envelope; a pair of electrical conductors sealed into and passing through the glass envelope; an arc tube disposed within the outer glass envelope, the arc tube including a pair of spaced electrodes therein with the electrodes being electrically connected to the electrical conductors; a chemical fill disposed within the arc tube, the chemical fill comprising mercury, scandium metal, sodium iodide, scandium iodide, lithium iodide, and a starting gas; and a support structure disposed within the outer glass envelope to support the arc tube therein, the support structure being electrically isolated from the electrical circuit of the lamp.
- the present invention is directed to a low wattage metal halide lamp having improved CRI.
- the low wattage metal halide discharge lamp of the present invention comprises an outer sealed glass envelope; a pair of electrical conductors sealed into and passing through the glass envelope; an arc tube disposed within the outer glass envelope, the arc tube including a pair of spaced electrodes therein with the electrodes being electrically connected to the electrical conductors such that one electrode is electrically connected to one electrical conductor; a chemical fill disposed within the arc tube, the chemical fill comprising mercury, scandium metal, sodium iodide, scandium iodide, lithium iodide, and a starting gas; and a support structure disposed within the outer glass envelope to support the arc tube therein, the support structure being electrically isolated from the electrical circuit of the lamp.
- FIGURE 1 of the drawings there is shown an example of a preferred embodiment of a lamp in accordance with the present invention.
- the illustrated lamp includes a quartz discharge tube 1 (also referred to herein as "arc tube") disposed within an outer sealed glass envelope 11.
- the outer envelope is most preferably evacuated, although the outer envelope of a lamp of the present invention need not be evacuated.
- the outer envelope 11 is hermetically sealed to a glass stem member 14 having an external base member 10 affixed thereto.
- a pair of electrical conductors 18 and 19 are sealed into and pass through the stem member 14 and provide access for energization of the discharge lamp by an external source (not shown).
- a support member 12 is secured to the glass stem member 14 and extends substantially parallel to the longitudinal axis of the lamp and forms a circular configuration 15 near the upper portion of the envelope 11.
- the circular configuration 15 in conjunction with a dimpled upper portion of the envelope 11 tends to maintain the support structure 12 in proper alignment and resistant to deformation caused by external shock.
- a radiating shield 13 is supported from the support structure 12 by means of a first strap member 16 and a second strap member 17.
- the first and second strap members 16 and 17 are welded to the support member 12 so as to extend therefrom in a direction normal to the longitudinal axis and the direction of the support member 12.
- the first and second strap members 16 and 17 are spaced apart from each other along the longitudinal axis of the lamp by a distance selected according to the length dimension of a radiating shield 13 so as to provide maximum support therefor.
- the discharge tube 1 has a pinch seal at each end thereof.
- a pair of electrodes 2 and 3 are sealed into the pinch seals of the discharge tube and project into the interior of the discharge tube 1.
- the electrodes are connected to metal foil members 4 and 5, preferably comprising molybdenum, which are sealed into the press seals.
- Electrical conductors 6 and 7 are attached to the foil members 4 and 5 and extend outwardly from the press seals. Electrical conductors 6 and 7 are in electrical connection with the first pair of electrical conductors 18 and 19 projecting from the glass stem member 14.
- a pair of getters 20 and 21 are affixed to the support structure 12 and serve to provide and maintain the vacuum within the evacuated outer envelope 11 in accordance with a most preferred embodiment of the invention.
- the discharge tube for use in a 100 watt size lamp, for example, has an internal diameter of 10 mm and an arc length of 14 mm.
- a single ended design (shown in FIG. 1) with a mogul type base, e.g., an E27 screw base, facilitates universal lamp operation with the full output rating in all burning positions and a life rating of 10,000 hours.
- the lamp may alternatively have a double-ended configuration (not shown) with a recessed single-contact base.
- the support structure 12 comprises an electrically conductive "floating-frame", which means that the frame is electrically isolated from the lamp's circuit.
- the frame 12 also supports the radiation shield 13 which surrounds the discharge tube 1.
- radiation shield is typically a quartz sleeve which can be open at one or both ends. When an end is closed it typically has a domed configuration.
- the "floating-frame” structure design is used to control the sodium loss from the arc tube fill by interrupting the electrical circuit between the frame and electrical conductors, arc tube electrodes, and external power source (not shown).
- the "floating-frame” structure provides electrical isolation between the radiation shield/arc tube support structure and the external circuit, resulting in the frame and shield floating at a positive potential thereby reversing the sodium electrolysis process.
- the features and advantages of the "floating-frame” structure are described in more complete detail in co-pending U.S. Patent Application Serial No. 814,140 of Robert S. White and James C. Morris, filed 27 December 1985, for "Low Wattage Metal Halide Discharge Lamp" and assigned to the Assignee of the present application, which application is hereby incorporated herein by reference.
- the "floating-frame" design permits the inclusion of lithium iodide in the chemical fill. It is the inclusion of the lithium iodide additive in the fill in the specified amounts which advantageously has been found to provide a low wattage metal halide type lamp having a color rendering index of at least 70, which has been heretofore unachievable by this low wattage type lamp.
- a preferred embodiment of the lamp of the present invention includes a transparent radiation shield 13 of fused quartz which surrounds the arc tube (to capture and return thermal radiation to the arc tube) and the radiation shield is immersed in vacuum (to eliminate heat conduction losses from the shield).
- the diameter and length of the radiation shield are chosen with respect to the arc tube dimensions to achieve the optimal radiation redistribution resulting in uniform arc tube wall temperatures. See, for example, U.S. Patent Application Serial Number 185,755, filed April 25, 1988, the disclosure of which is hereby incorporated herein by reference.
- the discharge tube 1 contains a chemical fill which is at least partially vaporized during lamp operation.
- the chemical fill comprises an inert starting gas, mercury, scandium metal, and a mixture of sodium iodide, scandium iodide, and lithium iodide.
- the scandium metal weight dosage is preferably from about 90 to 110 micrograms per cubic centimeter of arc tube volume.
- the molar ratio of sodium iodide to scandium iodide in the chemical fill is in the range of about 20:1 to 28:1 in order to obtain a desired color temperature and high luminous efficacy. See U.S. Patent 4,709,184, the disclosure of which is hereby incorporated herein by reference.
- the chemical fill included in the lamp of the present invention further includes a controlled amount of lithium iodide.
- the addition of lithium iodide has advantageously been found to significantly increase the lamp color rendering index (CRI) without detriment to the lamp luminous efficacy and other lamp parameters.
- FIGURE 2 shows lamp voltage and efficacy as a function of the amount of lithium iodide included in the chemical fill of a lamp in accordance with the present invention.
- the data set forth in Figure 2 was obtained using a 100 watt lamp having a configuration similar to that shown in Figure 1 and including a quartz arc tube having an internal diameter of 10 mm and an arc length of 14 mm.
- the amount of lithium iodide was varied from 0.5 to 6.0 milligrams.
- the fill otherwise otherwise comprised 13 mg mercury, 0.13 mg scandium metal, 10.7 mg sodium iodide, 1.3 mg scandium iodide, and 100 torr of argon starting gas.
- lithium iodide, sodium iodide, and scandium iodide correspond to a molar ratio of alkali metal iodides (lithium iodide plus sodium iodide) to scandium iodide from about 27:1 to about 40:1.
- Curve a of FIGURE 2 shows that while luminous efficacy linearly decreases with the increase of LiI amount, the operating voltage increases (see Curve b).
- the Color Temperature (Curve c) and CRI (Curve d) is shown as a function of the amount of lithium iodide.
- the lamps used to generate the results shown in FIGURE 3 are the same lamps which were described above in connection with FIGURE 2.
- the color temperature remains close to 3000 ⁇ 100°K.
- CRI increases from about 65 for a lamp including no lithium iodide in the chemical fill to about 74.5, for a lamp including 6 mg lithium iodide in its chemical fill.
- the amount of LiI included in the chemical fill of the lamp of the present invention is about 3-5 mg per 1.3 cubic centimeters, i.e., about 2-4 mg/cm3.
- Such lamps are characterized by a CRI greater than about 70 and a lumen per watt (LPW) value of about 90.
- the amount of lithium iodide (LiI) in the chemical fill of the lamp of the present invention is about 4 mg per 1.3 cubic centimeters, i.e., about 3 mg/cm3.
- Such lamps are characterized by an LPW value of about 91, CRI figure of about 72, and a color temperature of about 3000K.
- the lamp improvement in color rendering properties obtained with the addition of LiI to th NaI and ScI3 metal halide additives of the fill mixture is very important because it provides a new commercial application and market for low wattage type metal halide lamps, e.g., lighting applications requiring a Color Rendering Index greater than or equal to 70, such as Class II installations in Europe.
- composition of the chemical fill of the metal halide lamp of the present invention in combination with the arc tube wall loading level and the floating mount design provides a lamp for which the color shift is least sensitive to design deviations or aging effects.
- a preferred wall loading level for a low wattage metal halide discharge lamp of the present invention is in the range of about 14 to 17 watts/cm2.
- the color rendering index is plotted over lamp life (in hours) in FIGURE 4 showing that the color quality remains relatively constant as the lamp ages.
- the lamps used to obtain the data included in FIGURE 10 were similar to that shown in FIGURE 1 and described above.
- the lamp of the invention will provide equal luminous efficacy in both vertical and horizontal burning positions.
- the lamp of the invention will further provide uniform color constancy in all burning positions, allowing use of the lamp in all burning positions without sacrificing any of lamp performance.
- the lamp of the present invention will provide the still further advantage of providing lamp-to-lamp color uniformity over life.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US24337088A | 1988-09-12 | 1988-09-12 | |
US243370 | 1988-09-12 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0359200A2 true EP0359200A2 (fr) | 1990-03-21 |
EP0359200A3 EP0359200A3 (fr) | 1991-05-08 |
EP0359200B1 EP0359200B1 (fr) | 1994-06-22 |
Family
ID=22918490
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19890116864 Expired - Lifetime EP0359200B1 (fr) | 1988-09-12 | 1989-09-12 | Lampe à décharge à halogénures métalliques à rendu de couleurs amélioré |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0359200B1 (fr) |
JP (1) | JPH02177245A (fr) |
CA (1) | CA1324633C (fr) |
DE (1) | DE68916346T2 (fr) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0363991A2 (fr) * | 1988-10-14 | 1990-04-18 | Gte Products Corporation | Assemblage de lampe aux halogénures métalliques |
EP0540019A1 (fr) * | 1991-10-31 | 1993-05-05 | Gte Products Corporation | Assemblage de lampe à décharge à arc contenant un halogénure métallique |
EP0583113A1 (fr) * | 1992-07-29 | 1994-02-16 | Flowil International Lighting (Holding) B.V. | Tubes à arc pour lampes à décharge |
EP0784334A1 (fr) * | 1996-01-11 | 1997-07-16 | Osram Sylvania Inc. | Lampe à halogénures métalliques |
EP0806791A2 (fr) * | 1996-05-08 | 1997-11-12 | Osram Sylvania Inc. | Lampe à halogénure métallique |
EP0703601A3 (fr) * | 1994-09-26 | 1998-05-06 | Osram Sylvania Inc. | Support de la capsule émettrice de lumière dans une lampe |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007508663A (ja) * | 2003-10-10 | 2007-04-05 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | 高圧放電ランプ |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3979624A (en) * | 1975-04-29 | 1976-09-07 | Westinghouse Electric Corporation | High-efficiency discharge lamp which incorporates a small molar excess of alkali metal halide as compared to scandium halide |
GB1533345A (en) * | 1977-05-12 | 1978-11-22 | Gen Electric Co Ltd | High pressure electric discharge lamps |
EP0134426A1 (fr) * | 1983-06-09 | 1985-03-20 | GTE Products Corporation | Lampe à décharge aux halogénures avec des électrodes à un côté avec séparation des couleurs minimale |
EP0173235A2 (fr) * | 1984-08-20 | 1986-03-05 | GTE Products Corporation | Lampe à halogénure métallique à basse puissance |
EP0210626A2 (fr) * | 1985-08-01 | 1987-02-04 | General Electric Company | Lampe à décharge électrique à halogénure métallique |
-
1989
- 1989-09-11 CA CA000610989A patent/CA1324633C/fr not_active Expired - Fee Related
- 1989-09-12 EP EP19890116864 patent/EP0359200B1/fr not_active Expired - Lifetime
- 1989-09-12 JP JP23484189A patent/JPH02177245A/ja active Pending
- 1989-09-12 DE DE1989616346 patent/DE68916346T2/de not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3979624A (en) * | 1975-04-29 | 1976-09-07 | Westinghouse Electric Corporation | High-efficiency discharge lamp which incorporates a small molar excess of alkali metal halide as compared to scandium halide |
GB1533345A (en) * | 1977-05-12 | 1978-11-22 | Gen Electric Co Ltd | High pressure electric discharge lamps |
EP0134426A1 (fr) * | 1983-06-09 | 1985-03-20 | GTE Products Corporation | Lampe à décharge aux halogénures avec des électrodes à un côté avec séparation des couleurs minimale |
EP0173235A2 (fr) * | 1984-08-20 | 1986-03-05 | GTE Products Corporation | Lampe à halogénure métallique à basse puissance |
EP0210626A2 (fr) * | 1985-08-01 | 1987-02-04 | General Electric Company | Lampe à décharge électrique à halogénure métallique |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0363991A2 (fr) * | 1988-10-14 | 1990-04-18 | Gte Products Corporation | Assemblage de lampe aux halogénures métalliques |
EP0363991B1 (fr) * | 1988-10-14 | 1998-03-04 | Gte Products Corporation | Assemblage de lampe aux halogénures métalliques |
EP0540019A1 (fr) * | 1991-10-31 | 1993-05-05 | Gte Products Corporation | Assemblage de lampe à décharge à arc contenant un halogénure métallique |
EP0583113A1 (fr) * | 1992-07-29 | 1994-02-16 | Flowil International Lighting (Holding) B.V. | Tubes à arc pour lampes à décharge |
EP0703601A3 (fr) * | 1994-09-26 | 1998-05-06 | Osram Sylvania Inc. | Support de la capsule émettrice de lumière dans une lampe |
EP0784334A1 (fr) * | 1996-01-11 | 1997-07-16 | Osram Sylvania Inc. | Lampe à halogénures métalliques |
EP0806791A2 (fr) * | 1996-05-08 | 1997-11-12 | Osram Sylvania Inc. | Lampe à halogénure métallique |
EP0806791A3 (fr) * | 1996-05-08 | 1998-01-07 | Osram Sylvania Inc. | Lampe à halogénure métallique |
Also Published As
Publication number | Publication date |
---|---|
EP0359200A3 (fr) | 1991-05-08 |
CA1324633C (fr) | 1993-11-23 |
JPH02177245A (ja) | 1990-07-10 |
DE68916346T2 (de) | 1995-02-16 |
DE68916346D1 (de) | 1994-07-28 |
EP0359200B1 (fr) | 1994-06-22 |
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