Claims
- 1. A light bulb for an electrodeless discharge lamp,
- said light bulb having an envelope;
- said envelope having a cavity for containing means for exciting a substance inside the envelope so as to cause said light bulb to emit light;
- said envelope having a portion whose outer surface faces away from said cavity;
- said portion having a protuberance about 7 mm to 16 mm in length.
- 2. The light bulb of claim 1 wherein said protuberance is at an opposite end from said cavity.
- 3. The light bulb of claim 1 wherein said protuberance has a substantially cylindrical shape.
- 4. The light bulb of claim 1 wherein the protuberance is about 6 mm to 8 mm in diameter.
- 5. A light bulb for an electrodeless discharge lamp,
- said light bulb having an envelope;
- said envelope having a cavity for containing means for exciting a substance inside the envelope so as to cause said light bulb to emit light;
- said envelope having a portion whose outer surface faces away from said cavity;
- said portion having a protuberance such that when said lamp is lit and positioned so that said protuberance is directed downwards, said protuberance contains a cold spot of said lamp, wherein said protuberance is about 15 mm long.
- 6. A light bulb for an electrodeless discharge lamp,
- said light bulb having an envelope;
- said envelope having a cavity for containing means for exciting a substance inside the envelope so as to cause said light bulb to emit light;
- said envelope having a portion whose outer surface faces away from said cavity;
- said portion having a protuberance such that when said lamp is lit and positioned so that said protuberance is directed downwards, said protuberance contains a cold spot of said lamp,
- wherein the luminous flux generated by the light bulb when the substance is excited reaches its maximum when the temperature of the cold spot of the lamp is not higher than 60.degree. C., and
- wherein said envelope includes a substantially cylindrical surface between said cavity and said protuberance.
- 7. A discharge lamp having a light bulb, said light bulb having a first envelope which has a first portion such that an outer surface of said first portion faces, and is proximate to, a means for exciting a substance in said light bulb, wherein said substance, when excited, causes the bulb to emit light,
- said envelope having a second portion such that said second portion is separated from said means by said first portion and an outer surface of said second portion faces away from said means, wherein said second portion has a tubular protuberance extending towards an outside of said bulb, wherein:
- said second portion of the envelope comprises a cavity extending inside said light bulb,
- said protuberance is located inside said cavity, and said protuberance extends towards the outside of said bulb; and
- said light bulb includes a heat sink in said cavity which heat sink contacts said protuberance.
- 8. A lamp comprising:
- a light bulb having an envelope for containing a substance which when excited causes the light bulb to emit light, the envelope having a protuberance extending outside the envelope;
- a heat sink contacting the protuberance; and
- a second envelope surrounding said light bulb, the heat sink passing outside the second envelope.
- 9. A lamp comprising:
- a base;
- a light bulb attached to the base and having a substance inside such that when said substance is excited said light bulb emits light;
- means for exciting said substance; and
- a Peltier element contacting at least a portion of the light bulb and at least a portion of the base, for setting a predetermined temperature difference between said at least a portion of the light bulb and said at least a portion of the base.
- 10. A light bulb having an envelope which has a protuberance such that, when the light bulb is mounted on a base having a contact for contacting a power supply, said protuberance contacts said contact of said base.
- 11. A discharge lamp comprising:
- a base having a contact for contacting a contact of a power socket; and
- a light bulb comprising an envelope for containing a gaseous medium, said envelope having a protuberance contacting said contact of said base.
- 12. A light bulb having an envelope for containing a gaseous medium, said envelope having a convex portion which has a protuberance extending towards an outside of said envelope and having a diameter of about 6 mm to 8 mm.
- 13. The light bulb of claim 12 wherein said envelope has a cavity for receiving an induction coil, said cavity being at an opposite end of said envelope from said protuberance.
- 14. A lamp comprising:
- a light bulb having an envelope for containing a substance which when excited causes the light bulb to emit light, the envelope having a protuberance extending outside the envelope; and
- a heat sink contacting the protuberance,
- wherein the envelope has a cavity extending inside the envelope, the protuberance being located inside the cavity.
- 15. The lamp of claim 14 further comprising an induction coil for exciting the substance inside the light bulb, the induction coil being located in the cavity and surrounding the protuberance.
- 16. The lamp of claim 14 further comprising a base attached to the light bulb and contacting the heat sink.
- 17. The lamp of claim 15 wherein the heat sink is made of metal.
- 18. A light bulb having an envelope for containing a substance which when excited causes the light bulb to emit light, the envelope having a first cavity extending inside the envelope, the envelope having protuberance inside the first cavity, the protuberance extending outside the envelope, the envelope having a second cavity extending inside the envelope, the second cavity being spaced from the first cavity.
- 19. An electrodeless discharge lamp comprising the light bulb of claim 18 and also comprising an induction coil located in the second cavity.
- 20. An electrodeless discharge lamp comprising:
- a light bulb having an envelope which has a protuberance such that, when the light bulb is mounted on a base, the protuberance contacts the base, and
- an induction coil for exciting a substance inside the light bulb to cause the light bulb to emit light.
- 21. A method for generating light, the method comprising:
- providing a light bulb having an envelope, the envelope having a protuberance extending outside the envelope, the protuberance having a length of about 7 mm to 16 mm; and
- exciting a substance inside the envelope to cause the light bulb to emit light.
- 22. The method of claim 21 wherein the exciting step comprises:
- providing an induction coil outside the light bulb in a cavity of the envelope; and
- passing a current through the induction coil to ionize a gas inside the envelope.
- 23. A method for generating light, the method comprising:
- providing a light bulb having an envelope, the envelope having a protuberance extending outside the envelope, the protuberance having a diameter of about 6 mm to 8 mm; and
- exciting a substance inside the envelope to cause the light bulb to emit light.
- 24. The method of claim 23 wherein the exciting step comprises:
- providing an induction coil outside the light bulb in a cavity of the envelope; and
- passing a current through the induction coil to ionize a gas inside the envelope.
- 25. A method for generating light, the method comprising:
- providing a light bulb having an envelope, the envelope having a protuberance extending outside the envelope;
- exciting a substance inside the envelope to cause the light bulb to emit light; and
- contacting the protuberance with a heat sink to lower the light bulb temperature, wherein the exciting step comprises:
- providing an induction coil outside the light bulb in a cavity of the envelope; and
- passing a current through the induction coil to ionize a gas inside the envelope.
- 26. A method for generating light, the method comprising:
- providing a light bulb attached to a base and having an envelope having a protuberance, the protuberance extending outside the envelope and contacting the base; and
- exciting a substance inside the envelope to cause the light bulb to emit light,
- wherein the exciting step comprises:
- providing an induction coil in a cavity of the envelope around the protuberance; and
- passing a current through the induction coil to ionize a gas inside the envelope.
- 27. A method for generating light, the method comprising:
- providing a light bulb having an envelope, the envelope having a first cavity extending inside the envelope, the envelope having a protuberance inside the first cavity, the protuberance extending outside the envelope, the envelope having a second cavity extending inside the envelope;
- providing an induction coil in the second cavity; and
- passing a current through the induction coil to excite a substance inside the envelope to cause the light bulb to emit light.
- 28. A method for generating light, the method comprising:
- providing a light bulb attached to a base;
- exciting a substance inside the envelope to cause the light bulb to emit light; and
- passing a current through a Peltier element contacting at least a portion of the light bulb and at least a portion of the base, to set a predetermined temperature difference between said at least a portion of the light bulb and said at least a portion of the base.
- 29. A method for generating light, the method comprising:
- providing a light bulb having an envelope, the envelope having: (1) a cavity extending inside the envelope, (2) a protuberance extending outside the envelope, and (3) a substantially cylindrical surface between the cavity and the protuberance; and
- exciting a substance inside the envelope to cause the light bulb to emit light, wherein the luminous flux generated by the light bulb when the substance is excited reaches its maximum when the temperature of the cold spot of the light bulb is not higher than 60.degree. C.
- 30. The method of claim 29 wherein the exciting step comprises:
- providing an induction coil in the cavity; and
- passing a current through the induction coil to ionize a gas inside the envelope.
Parent Case Info
This application is a continuation of application Ser. No. 08/272,884, filed Jul. 7, 1994 (now abandoned), which is a continuation of application Ser. No. 07/883,971, filed May 20, 1992 (now abandoned).
US Referenced Citations (59)
Foreign Referenced Citations (2)
Number |
Date |
Country |
61-232551 |
Oct 1986 |
JPX |
710084 |
Jan 1980 |
SUX |
Non-Patent Literature Citations (1)
Entry |
Brochure of The operating principles of the Phillips QL lamp system, "QL Induction Lighting", Philips Lighting B.V., 1991. |
Continuations (2)
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Number |
Date |
Country |
Parent |
272884 |
Jul 1994 |
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Parent |
883971 |
May 1992 |
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