Halogen incandescent capsule having filament leg clamped in press seal
First Claim
1. A halogen incandescent capsule comprising:
- a light-transmitting capsule envelope which encloses a sealed cavity, said envelope having at least one end which is formed by a pinch, an inert gas containing halogen in said cavity, a tungsten filament having a pair of legs and a barrel portion therebetween, said barrel portion being arranged in said cavity, at least one of said pair of legs extending substantially non-linearly beyond one end of said barrel portion and into said pinch, and a pair of current supply wires extending into said pinch, at least one of said supply wires having a uniform size in said pinch and being attached at said pinch to a portion of the at least one of said pair of legs substantially extending non-linearly beyond one end of said barrel portion.
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Accused Products
Abstract
A hard-glass halogen gas-filled incandescent capsule with a single-end or a double-end has a tungsten filament with a primary coil extending from the barrel into the legs, and a secondary coil forming the barrel. One of the legs of the tungsten filament of the single-ended capsule extends into a pinch or press seal of the glass envelope to result in passive extinction of the electric arc at end-of-life. The end of the filament leg near the press seal may be connected to and/or supported by a molybdenum lead wire of the capsule that is within the pinch or the press seal via a clamp formed on the molybdenum lead wire. The passive extinction occurs when the electric arc is conducted through the filament extending into the press seal. Reliable extinction of the arc within the capsule is achieved with simplicity in construction and minimal materials. The primary coil is preferably stretched out to assume the diameter of the tungsten wire where it is embedded in a pinch seal. This hastens extinction of the arc at end of life and also simplifies manufacture by eliminating close tolerance requirements in the clamp.
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Citations
20 Claims
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1. A halogen incandescent capsule comprising:
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a light-transmitting capsule envelope which encloses a sealed cavity, said envelope having at least one end which is formed by a pinch, an inert gas containing halogen in said cavity, a tungsten filament having a pair of legs and a barrel portion therebetween, said barrel portion being arranged in said cavity, at least one of said pair of legs extending substantially non-linearly beyond one end of said barrel portion and into said pinch, and a pair of current supply wires extending into said pinch, at least one of said supply wires having a uniform size in said pinch and being attached at said pinch to a portion of the at least one of said pair of legs substantially extending non-linearly beyond one end of said barrel portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A halogen incandescent capsule comprising:
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a hard-glass envelope which encloses a sealed cavity, said envelope having at least one end which is firmed by a pinch, an inert gas containing halogen in said cavity, a tungsten filament having a pair of legs extending substantially non-linearly in opposite directions therefrom and a barrel portion therebetween, said barrel portion being a tungsten wire formed as a primary coil extending through said barrel portion and into said pair of legs, and a secondary coil forming said barrel portion, and a pair of molybdenum current supply wires extending into said envelope, said supply wires each being formed with a clamp which is clamped to a respective one of said pair of legs, at least one of said clamps and a portion of at least one of said pair of legs being located in said pinch, wherein said pair of molybdenum current supply wires has a uniform size in said cinch. - View Dependent Claims (18)
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19. A lamp comprising:
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a light-transmitting envelope which encloses a sealed cavity, said envelope having at least one end which is formed by a pinch;
a filament having a pair of legs extending substantially non-linearly in opposite directions therefrom and a barrel portion therebetween, said barrel portion being arranged in said cavity; and
a pair of wires extending into said pinch, at least one of said wires being attached to a portion of at least one of said pair of legs at said pitch and having a uniform size in said pinch. - View Dependent Claims (20)
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Specification