Direct view LED lamp with snap fit housing

• US 20090034283A1
• Filed: 01/24/2008
• Published: 02/05/2009
• Est. Priority Date: 08/01/2007
• Status: Active Grant

• Current Assignee: OSRAM Sylvania Inc. (Ams-Osram AG)
• Original Assignee: OSRAM Sylvania Inc. (Ams-Osram AG)
• Inventors: Tessnow, Thomas, Albright, Kim M.
• Granted Patent: US 7,972,038 B2
• Time in Patent Office: Days
• US Class Current: 362/545
• CPC Class Codes: F21S 41/24 Light guides
• CPC Class Codes: F21S 43/14 Light emitting diodes [LED]
• CPC Class Codes: F21S 43/15 Strips of light sources
• CPC Class Codes: F21S 43/249 with two or more light sources being coupled into the light guide
• CPC Class Codes: F21S 43/251 the light guides being used to transmit light from remote light sources
• CPC Class Codes: F21S 45/48 with means for conducting heat from the inside to the outside of the lighting devices, e.g. with fins on the outer surface of the lighting device
• CPC Class Codes: F21V 29/74 with fins or blades
• CPC Class Codes: F21V 29/773 the planes containing the fins or blades having the direction of the light emitting axis
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G02B 6/0008 the light being emitted at the end of the fibre

Abstract

A direct view LED lamp (10) comprising: a heat sink body (12) having a longitudinal axis (14) and a wall (16) having an exterior (18) and an interior (20). A cavity (22) is formed in the interior (20) and is defined by a circumferential side wall (24) and a back wall (26). A circuit board (28) is positioned in the cavity (22) adjacent the back wall (26). At least one LED (30) is mounted on the circuit board (28) facing in an axial direction parallel to the longitudinal axis (14) and away from the circuit board (28). An optical light guide (32) is positioned adjacent the at least one LED (30). A housing (42) spans the cavity (22) and has a coupling face (44) to mate with the heat sink body (12).

Claims

1. A direct view LED lamp comprising:

a heat sink body having a longitudinal axis and a wall having an exterior side and an interior side;

a cavity formed by said interior side and defined by a circumferential side wall and a back wall;

a circuit board positioned in said cavity adjacent said back wall;

at least one LED mounted on said circuit board facing in an axial direction parallel to said longitudinal axis and away from said circuit board;

an optical light guide adjacent said at least one LED, said optical light guide having a guide portion having an internally reflective surface and at least one optical input window, the guide portion extending axially away from the optical input window to an optical output window in a direction parallel to said longitudinal axis;

a housing at least spanning the cavity, and having a coupling face to mate with said heat sink body; and

at least one first closure feature associated with said housing to latch said housing in a fixed relation to said heat sink body, the heat sink body having a second closure feature to cooperate with said first closure feature, said housing having an optical passage permitting the passage of light from said output window to the lamp exterior.

2. The direct view LED lamp of claim 1 wherein said housing includes at least one pressure foot to pin said circuit board in close thermal contact with said back wall.

3. The direct view LED lamp of claim 1 wherein said housing includes a compressible pressure element to pin said optical light guide in close optical connection to said at least one LED.

4. The direct view LED lamp of claim 1 including a gasket intermediate said housing and said heat sink body that seals said cavity.

5. The direct view LED lamp of claim 1, wherein said closing feature includes a tensioned female portion on said housing and a male portion formed on an said exterior of said heat sink body.

6. The direct view LED lamp of claim 1 wherein said circuit board includes an alignment registration, and said optical light guide includes an alignment fitting mated in registration to said alignment registration.

7. The direct view LED lamp of claim 1 wherein said alignment registration is an opening in said circuit board, and said alignment fitting is a key, sized and shaped to fit a keyway.

8. The direct view LED lamp of claim 1, wherein said heat sink body roughly defines a cylindrically shaped body including a plurality of heat conductive fins exposed to exterior air.

9. The direct view LED lamp of claim 1, wherein said heat sink body includes a socket receptacle containing electrical connections, and said electrical connections extend from said socket receptacle to said circuit board.

10. A direct view LED lamp comprising:

a heat sink body having a longitudinal axis and a wall having an exterior and an interior;

a cavity formed in said interior defined by a circumferential side wall and a back wall;

said heat sink body roughly defining a cylindrically shape including a plurality of heat conductive fins;

said heat sink body including a socket receptacle containing electrical connections, said electrical connection extending from said socket receptacle to a circuit board positioned in said cavity adjacent said back wall;

at least one LED mounted on said circuit board facing in a direction parallel to said longitudinal axis and axially away from said circuit board;

an optical light guide having at least one optical input window adjacent said at least one LED and including a guide portion having an internally reflective surface, said guide portion extending axially away from said optical input window to an optical output window;

said circuit board including an alignment registration, and said optical light guide including an alignment fitting mated in registration to said alignment registration;

the alignment registration being an opening in said circuit board, and the alignment fitting being a clip, said clip being sized and shaped to fit said opening;

a housing at least spanning the cavity and having a coupling face to mate with said heat sink body, and at leas a first closure feature to latch the housing in a fixed relation to the heat sink body, said closing feature including a tensioned female contact latched in tension with a male contact on said exterior of said heat sink body, said housing further having an optical passage permitting the passage of light from the output window to the lamp exterior, and said housing including at least one pressure foot to pin said circuit board in close thermal contact with said back wall;

a gasket intermediate said housing and said heat sink body sealing said cavity; and

a compressible pressure element intermediate said housing and said light guide to pin said optical light guide in close optical connection to said at least one LED.