High intensity discharge lamp with ignition aid
First Claim
1. A high intensity discharge lamp comprising:
- an electrically insulating arc tube comprised of light transmissive material having a central portion and two legs each of which extends from said central portion, said central portion forming an interior discharge region;
electrical conductors each extending through one of said legs and being spaced apart from each other in said discharge region;
a sealed shroud comprised of light transmissive material enclosing said arc tube and electrical connection to said electrical conductors through said sealed shroud;
an electrically conductive frame member disposed in an interior of said shroud that is electrically connected to one of said electrical conductors;
an ignition aid comprising electrically conductive foil that is fastened to said frame member and forms a closed loop that encircles one of said legs of said arc tube around one of said electrical conductors, wherein said foil encircles said leg by a range of at least 270 degrees to 360 degrees; and
wherein said foil includes two end portions, and a central portion therebetween that encircles said arc tube leg, a first said end portion of said foil being connected to said frame member and a second said end portion of said foil being connected to said foil between said central portion and said first end portion of said foil.
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0 Petitions
Accused Products
Abstract
A high intensity discharge lamp includes an electrically insulating arc tube. A sealed shroud encloses the arc tube. An electrically conductive frame member is disposed inside the shroud and is electrically connected to an electrical conductor that extends in the arc tube. Electrically conductive foil is fastened to the frame member and forms a closed loop that encircles a leg of the arc tube by an angle in a range of at least 270 degrees to 360 degrees. The foil can be connected to the frame member and to itself. A distance from an outer surface of a flange of the arc tube leg to a proximal edge of the foil can range from 1.5 to 8 mm. A width of the foil can range from 1 mm to 4 mm.
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Citations
31 Claims
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1. A high intensity discharge lamp comprising:
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an electrically insulating arc tube comprised of light transmissive material having a central portion and two legs each of which extends from said central portion, said central portion forming an interior discharge region; electrical conductors each extending through one of said legs and being spaced apart from each other in said discharge region; a sealed shroud comprised of light transmissive material enclosing said arc tube and electrical connection to said electrical conductors through said sealed shroud; an electrically conductive frame member disposed in an interior of said shroud that is electrically connected to one of said electrical conductors; an ignition aid comprising electrically conductive foil that is fastened to said frame member and forms a closed loop that encircles one of said legs of said arc tube around one of said electrical conductors, wherein said foil encircles said leg by a range of at least 270 degrees to 360 degrees; and wherein said foil includes two end portions, and a central portion therebetween that encircles said arc tube leg, a first said end portion of said foil being connected to said frame member and a second said end portion of said foil being connected to said foil between said central portion and said first end portion of said foil. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 15, 17, 18, 19, 20, 28, 29, 30, 31)
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13. A high intensity discharge lamp comprising:
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an electrically insulating arc tube comprised of light transmissive material having a central portion and two legs each of which extends from said central portion, said central portion forming an interior discharge region, wherein each of said legs includes a flange and a boss extending from said flange into said discharge region so that said flange abuts said central portion; electrical conductors each extending through one of said legs and being spaced apart from each other in said discharge region; a sealed shroud comprised of light transmissive material enclosing said arc tube and electrical connection to said electrical conductors through said sealed shroud; an electrically conductive frame member disposed in an interior of said shroud that is electrically connected to one of said electrical conductors; an ignition aid comprising electrically conductive foil that is fastened to said frame member and forms a closed loop that encircles one of said legs of said arc tube around one of said electrical conductors, wherein said foil encircles said leg by a range of at least 270 degrees to 360 degrees; and wherein said foil includes two end portions, and a central portion therebetween that encircles said arc tube leg, a first said end portion of said foil being connected to said frame member and a second said end portion of said foil being connected to said foil between said central portion and said first end portion of said foil; wherein a distance from an outer surface of said flange to a proximal edge of said foil is not more than 8 mm.
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14. A high intensity discharge lamp comprising:
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an electrically insulating arc tube comprised of light transmissive material having a central portion and two legs each of which extends from said central portion, said central portion forming an interior discharge region, wherein each of said legs includes a flange and a boss extending from said flange into said discharge region so that said flange abuts said central portion; electrical conductors each extending through one of said legs and being spaced apart from each other in said discharge region; a sealed shroud comprised of light transmissive material enclosing said arc tube and electrical connection to said electrical conductors through said sealed shroud; an electrically conductive frame member disposed in an interior of said shroud that is electrically connected to one of said electrical conductors; an ignition aid comprising electrically conductive foil that is fastened to said frame member and forms a closed loop that encircles one of said legs of said arc tube around one of said electrical conductors, wherein said foil encircles said leg by a range of at least 270 degrees to 360 degrees; and wherein said foil includes two end portions, and a central portion therebetween that encircles said arc tube leg, a first said end portion of said foil being connected to said frame member and a second said end portion of said foil being connected to said foil between said central portion and said first end portion of said foil;
wherein a distance from an outer surface of said flange to a proximal edge of said foil is not more than 2 mm.
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16. A high intensity discharge lamp comprising:
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an electrically insulating arc tube comprised of light transmissive material having a central portion and two legs each of which extends from said central portion, said central portion forming an interior discharge region, wherein said discharge region comprises inert gas, krypton gas and a dose of mercury and metal halides, wherein a mixture of argon gas and Kr85 gas present in the discharge region has an activity concentration of not greater than 0.16 MBq/liter; electrical conductors each extending through one of said legs and being spaced apart from each other in said discharge region; a sealed shroud comprised of light transmissive material enclosing said arc tube and electrical connection to said electrical conductors through said sealed shroud; an electrically conductive frame member disposed in an interior of said shroud that is electrically connected to one of said electrical conductors; an ignition aid comprising electrically conductive foil that is fastened to said frame member and forms a closed loop that encircles one of said legs of said arc tube around one of said electrical conductors, wherein said foil encircles said leg by a range of at least 270 degrees to 360 degrees; and wherein said foil includes two end portions, and a central portion therebetween that encircles said arc tube leg, a first said end portion of said foil being connected to said frame member and a second said end portion of said foil being connected to said foil between said central portion and said first end portion of said foil.
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21. A high intensity discharge lamp comprising:
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an electrically insulating arc tube comprised of light transmissive material having a central portion and two legs each of which extends from said central portion, said central portion forming an interior discharge region, wherein each of said legs includes a flange and a boss extending from said flange into said discharge region so that said flange abuts said central portion; electrical conductors each extending through one of said legs and being spaced apart from each other in said discharge region; a sealed shroud comprised of light transmissive material enclosing said arc tube and electrical connection to said electrical conductors through said sealed shroud; an electrically conductive frame member disposed in an interior of said shroud that is electrically connected to one of said electrical conductors; an ignition aid comprising electrically conductive foil that is fastened to said frame member and forms a closed loop that encircles one of said legs of said arc tube around one of said electrical conductors, wherein said foil encircles said leg by a range of at least 270 degrees to 360 degrees; wherein a distance from an outer surface of said flange to a proximal edge of said foil ranges from 1.5 to 8 mm. - View Dependent Claims (22, 23, 24)
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25. A high intensity discharge lamp comprising:
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an electrically insulating arc tube comprised of light transmissive material having a central portion and two legs each of which extends from said central portion, said central portion forming an interior discharge region; electrical conductors each extending through one of said legs and being spaced apart from each other in said discharge region; a sealed shroud comprised of light transmissive material enclosing said arc tube and electrical connection to said electrical conductors through said sealed shroud; an electrically conductive frame member disposed in an interior of said shroud that is electrically connected to one of said electrical conductors; an ignition aid comprising electrically conductive foil that is fastened to said frame member and forms a closed loop that encircles one of said legs of said arc tube around one of said electrical conductors, wherein said foil encircles said leg by a range of at least 270 degrees to 360 degrees; wherein a width of said foil ranges from 1 mm to 4 mm; wherein each of said legs includes a flange and a boss extending from said flange into said discharge region so that said flange abuts said central portion, wherein a distance from an outer surface of said flange to a proximal edge of said foil ranges from 1.5 to 8 mm. - View Dependent Claims (26)
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27. A high intensity discharge lamp comprising:
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an electrically insulating arc tube comprised of light transmissive material having a central portion and two legs each of which extends from said central portion, said central portion forming an interior discharge region, wherein a mixture of argon gas and Kr85 gas present in the discharge region has an activity concentration of not greater than 0.16 MBq/liter; electrical conductors each extending through one of said legs and being spaced apart from each other in said discharge region; a sealed shroud comprised of light transmissive material enclosing said arc tube and electrical connection to said electrical conductors through said sealed shroud; an electrically conductive frame member disposed in an interior of said shroud that is electrically connected to one of said electrical conductors; an ignition aid comprising electrically conductive foil that is fastened to said frame member and forms a closed loop that encircles one of said legs of said arc tube around one of said electrical conductors, wherein said foil encircles said leg by a range of at least 270 degrees to 360 degrees; wherein a width of said foil ranges from 1 mm to 4 mm.
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Specification