Led lamp

• US 6,220,722 B1
• Filed: 09/16/1999
• Issued: 04/24/2001
• Est. Priority Date: 09/17/1998
• Status: Expired due to Fees

• Current Assignee: US Philips Corporation (Koninklijke Philips N.V.)
• Original Assignee: US Philips Corporation (Koninklijke Philips N.V.)
• Inventors: Begemann, Simon H. A.
• Primary Examiner(s): O'Shea, Sandra
• Assistant Examiner(s): Lee, Guiyoung
• Application Number:
  US09/397,741
• Time in Patent Office: 586 Days
• Field of Search: 362/231, 362/294, 362/373, 362/545, 362/555, 362/547, 362/264, 362/230, 362/241, 362/247, 362/226, 362/800, 362/249, 313/35, 313/36
• US Class Current: 362/231
• CPC Class Codes: F21K 9/232 specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
• CPC Class Codes: F21S 8/036 by means of a rigid support, e.g. bracket or arm
• CPC Class Codes: F21V 23/04 the elements being switches safety devices F21V25/00
• CPC Class Codes: F21V 29/67 characterised by the arrangement of fans
• CPC Class Codes: F21V 29/677 the fans being used for discharging
• CPC Class Codes: F21V 29/70 characterised by passive heat-dissipating elements, e.g. heat-sinks
• CPC Class Codes: F21V 29/83 the elements having apertures, ducts or channels, e.g. heat radiation holes
• CPC Class Codes: F21V 3/00 Globes; Bowls; Cover glasses with refracting properties F21V5/00; with reflecting properties F21V7/00; characterised by cooling arrangements F21V29/506
• CPC Class Codes: F21W 2131/10 Outdoor lighting
• CPC Class Codes: F21Y 2107/40 on the sides of polyhedrons, e.g. cubes or pyramids
• CPC Class Codes: F21Y 2113/17 forming a single encapsulated light source
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: Y10S 362/80 Light emitting diode
• CPC Class Codes: Y10S 362/802 Position or condition responsive switch

Abstract

The invention relates to a LED lamp having a gear column which is connected, at its first end, to a lamp cap and, at its other end, to a substrate. The substrate is provided with a regular polyhedron of at least four planes, the planes having at least one LED having a luminous flux of at least 5 lm. The gear column also have heat-dissipating means which interconnect the substrate and the lamp cap. A continuous and regular illumination with a high luminous flux can be obtained using a LED lamp of this type.

Claims

1. A LED lamp comprising a gear column, a lamp cap which is connected to an end of the gear column and a substrate which is connected to the other end of the gear column, wherein the substrate comprises a regular polyhedron of at least four faces, wherein faces of the polyhedron are each provided with at least one LED which, during operation of the lamp, has a luminous flux of at least 5 lm, and wherein the column comprises heat-dissipating means interconnecting the substrate and the lamp cap.

2. A LED lamp as claimed in claim 1, characterized in that the lamp is also provided with a (semi-)transparent envelope.

3. A LED lamp as claimed in claim 1, characterized in that the heat-dissipating means comprise a metal connection between the substrate and the lamp cap.

4. A LED lamp as claimed in claim 1, further comprising cooling means in the gear column, which are used to generate an air flow in the lamp.

5. A LED lamp as claimed in claim 1, characterized in that the faces of the polyhedron are provided with an array of LEDs, which preferably comprises at least one green, at least one red and at least one blue LED or at least one green, at least one red, at least one yellow and at least one blue LED or at least one white LED.

6. A LED lamp as claimed in claim 1, characterized in that the lamp is provided with means for changing the luminous flux of the LEDs.

7. A LED lamp as claimed in claim 1, characterized in that the lamp is provided with means for mutually varying the luminous flux of the LEDs provided on the various faces of the substrate.