LED Lamp Replacement of Low Power Incandescent Lamp

• US 20100277069A1
• Filed: 06/30/2010
• Published: 11/04/2010
• Est. Priority Date: 01/10/2008
• Status: Active Grant

• Current Assignee: Feit Electric Company Incorporated
• Original Assignee: Goeken Group Corp.
• Inventors: Scianna, Carlo, Janik, Raymond
• Granted Patent: US 8,408,748 B2
• Time in Patent Office: Days
• US Class Current: 315/35
• CPC Class Codes: F21K 9/23 Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
• CPC Class Codes: F21K 9/232 specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
• CPC Class Codes: F21K 9/235 Details of bases or caps, i.e. the parts that connect the light source to a fitting; Arrangement of components within bases or caps F21K9/238 takes precedence
• CPC Class Codes: F21K 9/237 Details of housings or cases, i.e. the parts between the light-generating element and the bases; Arrangement of components within housings or cases F21K9/238 takes precedence
• CPC Class Codes: F21K 9/238 Arrangement or mounting of circuit elements integrated in the light source
• CPC Class Codes: F21V 19/005 by permanent fixing means, e.g. gluing, riveting or embedding in a potting compound
• CPC Class Codes: F21V 19/006 of point-like light sources, e.g. incandescent or halogen lamps, with screw-threaded or bayonet base of sources having contact pins, wires or blades F21V19/0005; of LEDs or sources mounted on printed-circuit board F21V19/001
• CPC Class Codes: F21V 23/005 the substrate is supporting also the light source
• CPC Class Codes: F21V 29/70 characterised by passive heat-dissipating elements, e.g. heat-sinks
• CPC Class Codes: F21V 29/80 with pins or wires
• CPC Class Codes: F21V 29/83 the elements having apertures, ducts or channels, e.g. heat radiation holes
• CPC Class Codes: F21V 3/02 characterised by the shape
• CPC Class Codes: F21Y 2101/00 Point-like light sources
• CPC Class Codes: F21Y 2107/90 on two opposite sides of supports or substrates
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H05B 45/10 Controlling the intensity of the light
• CPC Class Codes: H05K 1/0207 using internal conductor planes parallel to the surface for thermal conduction, e.g. power planes

Abstract

An LED lamp that can take the place of incandescent lamps. An elevated light source is positioned above a screw-type base. A first plurality of LEDs is connected in a series on one side of a flat substrate and a second plurality of LEDs, equal in number to the first, is connected in series on an opposite side of the substrate. Each LED of the first and second plurality of LEDs is mounted proximate a heat sink and a drive circuit is provided for the LEDs, with the drive circuit being located proximate and electrically connected to the screw base.

Claims

1. An LED lamp comprising

a. a base,

b. an elevated light source, comprising

i. a first plurality of LEDs connected in series and mounted on one side of a generally flat substrate, said substrate being spaced from said base, and

ii. a second plurality of LEDs, equal in number to said first plurality of LEDs, connected in series and mounted on an opposite side of said generally flat substrate, said second plurality of LEDs being located generally in registration with said first plurality of LEDs,

b. a heat sink in said substrate, each LED of said first and second plurality of LEDs being mounted proximate said heat sink, and

c. a drive circuit for said LEDs, said drive circuit being located proximate and electrically connected to said base.

2. The LED lamp according to claim 1, in which said base is a screw-type base.

3. The LED lamp according to claim 1, in which said drive circuit is mounted on a circuit board extending from said flat substrate, said circuit board extending into said base.

4. The LED lamp according to claim 1, in which said heat sink comprises at least one conductive heat island on each side of said substrate, each LED of said first plurality of LEDs being proximate a heat island on said one side, and each LED of said second plurality of LEDs being proximate a heat island on said opposite side.

5. The LED lamp according to claim 4, in which said heat sink includes at least one conductive heat spreader, each heat island being connected to said heat spreader.

6. The LED lamp according to claim 5, in which said heat spreader is located in said substrate, said heat spreader extending to said base.

7. The LED lamp according to claim 5, including first and second heat spreaders, each heat island on said one side of said substrate being connected to said first heat spreader and each heat island on said opposite side being connected to said second heat spreader.

8. The LED lamp according to claim 7, in which said heat spreaders are unitary.

9. The LED lamp according to claim 1, including a globe connected to said base.

10. The LED lamp according to claim 1, in which said first and second plurality of LEDs are oriented generally in an arc.

11. The LED lamp according to claim 1, in which said drive circuit comprises a surge suppressor, a rectifier, a smoothing capacitor and resistor, said first plurality of LEDs and said second plurality of LEDs being connected in parallel to said resistor.

12. The LED lamp according to claim 1, in which said substrate is oriented parallel to a line extending from said base.

13. The LED lamp according to claim 1, in which said substrate is oriented perpendicular to a line extending from said base.

14. The LED lamp according to claim 13, in which said heat sink comprises a plurality of conductive heat spreader rods extending from proximate said base to said substrate.

15. The LED lamp according to claim 14, in which said heat sink includes at least one conductive heat island on each side of said substrate, each LED of said first plurality of LEDs being proximate a heat island on said one side, and each LED of said second plurality of LEDs being proximate a heat island on said opposite side.