LED light source mimicking a filamented lamp

• US 6,880,962 B2
• Filed: 12/09/2002
• Issued: 04/19/2005
• Est. Priority Date: 12/09/2002
• Status: Expired due to Term

• Current Assignee: OSRAM Sylvania Inc. (Ams-Osram AG)
• Original Assignee: OSRAM Sylvania Inc. (Ams-Osram AG)
• Inventors: Tucker, Michael, Tessnow, Thomas, Coushaine, Charles M., Sidwell, Steve C.
• Primary Examiner(s): Husar, Stephen
• Assistant Examiner(s): Sawhney, Hargobind S.
• Application Number:
  US10/314,714
• Publication Number:
  US 20040109327A1
• Time in Patent Office: 862 Days
• Field of Search: 362/543, 362/544, 362/545, 362/540, 362/548, 362/549, 362/226, 362/234, 362/236, 362/240, 362/254, 362/310, 362/364, 362/429, 362/368, 362/800, 362/810, 313/318.01, 313/318.05, 313/318.12, 313/512, 439/890
• US Class Current: 362/555
• 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 9/61 using light guides
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G02B 6/0021 for housing at least a part of the light source, e.g. by forming holes or recesses
• CPC Class Codes: G02B 6/0068 Arrangements of plural sources, e.g. multi-colour light sources
• CPC Class Codes: G02B 6/0073 Light emitting diode [LED]
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H01L 33/54 having a particular shape
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

A solid-state light source (10) that is compatible with the existing sockets normally reserved for filamented lamps (100). The solid-state light source (10) includes a hollow base (12) formed to mechanically and electrically adapt to an existing socket normally reserved for lamps (100). A sub-assembly (14) is adapted to cooperate with and fit into the hollow base (12). The sub-assembly (14) includes a circuit board (16) with a plurality of solid-state light sources (18) mechanically and electrically connected to one side (20) of the circuit board. Two electrical contacts (22, 24) are positioned on the other side (26) of the circuit board for connection to an electrical circuit. A light pipe (28) covers the plurality of light sources (18) and extends away therefrom to a terminal end (30). A light radiator (34) is affixed to the terminal end (30) and a light-opaque shroud (33) surrounds the light pipe (32) to keep all of the light generated by the solid-state light source within the light pipe (32) to exit out of the light radiator (34).

Claims

1. A solid-state light source compatible with existing sockets normally reserved for filamented lamps comprising:

a hollow base formed to mechanically and electrically adapt to a socket; and

a sub-assembly adapted to cooperate with and fit into said hollow base, said sub-assembly comprising;

a circuit board;

a plurality of solid-state light sources mechanically and electrically connected to a first side of said circuit board;

two electrical contacts positioned on a second side of said circuit board for connection to an electrical circuit;

a light pipe covering said plurality of light sources and extending away therefrom to a terminal end;

a light radiator affixed to said terminal end; and

a light-opaque shroud surrounding said light pipe, and

wherein said two electrical contacts each comprise;

an elongated flange extending along said second side of said circuit board;

a substantially triangular segment depending from said flange at substantially a right angle and a terminal portion extending away from the apex of said triangular segment.

2. The solid-state light source of claim 1 wherein said terminal portion extends through said hollow base and is formed back upon itself to seat on an external surface of said base.

3. A solid-state light source compatible with an existing socket normally reserved for a known filamented lamp, comprising:

a base formed to mechanically and electrically adapt to a socket; and

a sub-assembly adapted to cooperate with and fit into said base, said sub-assembly comprising;

a plurality of solid-state light sources mechanically supported in the base;

two electrical contacts electrically connected to the solid-state light sources and extending to exterior electrical contacts as adapted to the socket;

a light pipe receiving input light from said plurality of light sources and extending away therefrom to a terminal end;

a light radiator affixed to said terminal end, the light radiator being shaped to radiate light that mimics the radiation of a filament; and

a light-opaque shroud substantially surrounding said light pipe between the light sources and the light radiator.