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Lighting units

  • US 5,890,794 A
  • Filed: 04/03/1996
  • Issued: 04/06/1999
  • Est. Priority Date: 04/03/1996
  • Status: Expired due to Fees
First Claim
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1. A lighting unit comprising:

  • a circuit board assembly having an insulating substrate with an outer side and an inner side opposite said outer side, and a plurality of conductive circuit lands extending along said inner side;

    a plurality of LED packages mounted on said outer side, with leads extending through holes in said insulating substrate and individually soldered to said conductive circuit lands, wherein each LED package within said plurality thereof includes a light-emitting segment in a base portion, a light transmitting portion extending from said base portion along an optical axis of said LED package, and a lens portion at an end of said light transmitting portion to direct light from said light-emitting segment away from said LED package, and wherein each said LED package is mounted with said optical axis thereof extending outward from said outer side and perpendicular thereto;

    a transparent cover extending outwardly adjacent said LED packages, wherein a first cavity between said transparent cover and said LED packages is sealed from ambient air;

    a housing extending from said inner side, with said circuit board assembly being attached to said housing and supported thereby, wherein a second cavity within said housing is sealed from ambient air, wherein said housing has a generally cylindrical outer surface extending between first and second ends thereof, and a generally cylindrical inner surface, coaxial with said generally cylindrical outer surface, extending around said second cavity, wherein said insulating substrate is flexible and is curved around said generally cylindrical outer surface, with said optical axis of each said LED package extending radially outward from said outer surface; and

    a plurality of circuit wires individually attached to various of said circuit lands and extending outward through a hole in said housing; and

    ,a base extending outward from said first end of said housing, with said first end of said housing being attached to said base;

    wherein said transparent cover has a cylindrical cover portion extending around said circuit board assembly and said plurality of LED packages from a peripheral portion of said base, and an end cover portion extending across said second end of said housing, wherein said base includes an outer threaded portion, wherein said transparent cover includes a threaded surface at a first end thereof engaging said outer threaded portion, wherein said lighting unit includes a first gasket which is compressed as said threaded surface at said first end of said transparent cover is screwed into engagement with said outer threaded portion, and wherein said end cover portion extends across a second end of said transparent cover, said second end thereof being opposite said first end thereof, as an integral portion of said transparent cover.

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