Halogen incandescent lamp and a lighting apparatus using the lamp
AssigneeToshiba Lighting & Technology Corporation
InventorsMakoto Sakai, Hideto Mochizuki, Makoto Bessho, Kazuhiro Ikejiri, Masayuki Takahashi
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Abstract
A halogen incandescent lamp comprises a light-transmitting envelope filled with a gas including a halogen gas and an inert gas. A pair of inner conductive wires is arranged in the envelope. A triple-coiled filament, which has a first coiling, a second coiling, and a third coiling having about 1.5 to about 4 turns, is re-crystallized, is arranged in the envelope, and is connected between ends of the inner conductive wires. The triple-coiled filament is held by a support member. The halogen incandescent lamp may be utilized to a lighting apparatus.
Claims5
A halogen incandescent lamp, comprising:
- a light-transmitting envelope, filled with gas including halogen gas and inert gas;
- a pair of inner conductive wires arranged in the envelope;
- a triple-coiled filament, which has a first coiling, a second coiling, and a third coiling, is re-crystallized, is connected between ends of the inner conductive wire, and meets the following condition:
- % p1≧% p2≧% p3, wherein
- % p1 is a pitch ratio of the first coiling defined by the following formula:
- % p1=(p1/D)*100, wherein D is a diameter of a filament wire;
- % p2 is a pitch ratio of the second coiling defined by the following formula:
- % p2=(p2/D)*100, wherein D is an outer diameter of the first coiling, and
- % p3 is a pitch ratio of the third coiling defined by the following formula:
- % p3=(p3/D)*100, wherein D is an outer diameter of the second coiling,
- p1, p2 and p3 are respectively a distance from center to center of two adjacent coil turns of the first coiling, the second coiling, and the third coiling.
A lighting apparatus, comprising:
- a halogen incandescent lamp having a reflector, wherein the lamp comprises:
- a light-transmitting envelope, filled with gas including halogen gas and inert gas;
- a pair of inner conductive wires arranged in the envelope;
- a triple-coiled filament, which has a first coiling, a second coiling, and a third coiling is re-crystallized, is connected between ends of the inner conductive wires, and meets the following condition:
- % p1≧% p2≧% p3, wherein
- % p1 is a pitch ratio of the first coiling defined by the following formula:
- % p1=(p1/D)*100, wherein D is a diameter of a filament wire;
- % p2 is a pitch ratio of the second coiling defined by the following formula:
- % p2=(p2/D)*100, wherein D is an outer diameter of the first coiling, and
- % p3 is a pitch ratio of the third coiling defined by the following formula:
- % p3=(p3/D)*100, wherein D is an outer diameter of the second coiling,
- p1, p2, and p3 represent a distance from center to center of two adjacent coil turns of the first coiling, the second coiling, and the third coiling, respectively, and
- a housing accommodating the lamp.
Dependencies are inferred from the claim text.