Light emitting diode bulb

• US 8,210,735 B2
• Filed: 05/10/2011
• Issued: 07/03/2012
• Est. Priority Date: 07/20/2010
• Status: Active Grant

• Current Assignee: Kumho Electric Inc.
• Original Assignee: Kumho Electric Inc.
• Inventors: Choi, Woo Sun
• Primary Examiner(s): Choi, Jacob Y
• Assistant Examiner(s): Arpin, Anthony
• Application Number:
  US13/104,690
• Publication Number:
  US 20120019139A1
• Time in Patent Office: 420 Days
• Field of Search: 362649-652, 362/657, 362/264
• US Class Current: 362/650
• CPC Class Codes: F21K 9/233 specially adapted for generating a spot light distribution, e.g. for substitution of reflector lamps
• CPC Class Codes: F21V 17/12 by screwing
• CPC Class Codes: F21V 29/773 the planes containing the fins or blades having the direction of the light emitting axis
• 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: F21Y 2103/33 annular
• CPC Class Codes: F21Y 2105/10 comprising a two-dimensional array of point-like light-generating elements
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

An LED bulb includes an LED module having a PCB on which at least one LED element is mounted. A housing has a plurality of heat dissipating protrusions which protrude from an outer circumferential surface thereof, with a thread being formed on a predetermined portion of the housing. A light transmitting cover has a thread by which the cover can be fastened to the thread which is formed on the predetermined portion of the housing, in a threaded manner. Further, the LED bulb includes a bottom case into which an inverter for supplying a direct current to the LED module is inserted. The bottom case is inserted into the housing to be fastened to the housing. A socket is fastened to the bottom case.

Claims

1. A LED bulb, comprising:

a LED module having a PCB on which at least one LED element is mounted;

a housing having on a predetermined portion thereof a thread, and integrated with a plurality of heat dissipating protrusions which protrude from an outer circumferential surface thereof, an inverter through-hole into which an upper protrusion of an inverter is inserted, and a fastening screw hole which is configured to fasten the housing to a bottom case using a fastening screw;

a light transmitting cover having a thread by which the cover can be fastened to the corresponding thread which is formed on the predetermined portion of the housing, in a threaded manner;

the bottom case into which the inverter, for supplying a direct current to the LED module, is inserted, the bottom case being inserted into the housing to be fastened to the housing;

a thermal conductive resin comprising silicone and molded in an internal space of the bottom case except for an area into which the inverter is inserted; and

a socket into which the bottom case is inserted and which is fastened to the bottom case,

wherein the light transmitting cover is hemisphere,

wherein the bottom case has an inverter groove into which the inverter is inserted, and a fastening screw groove configured to fasten the bottom case to the housing the fastening screw, and

wherein the lower part of the inverter slides and is inserted into the inverter groove of the bottom case, the upper protrusion of the inverter being inserted into the inverter through-hole of the housing, such that the inverter is placed in the inverter groove of the bottom case, being held by the inverter groove of the bottom case and the inverter through-hole of the housing.

2. The LED bulb as set forth in claim 1, wherein the plurality of heat dissipating protrusions are radially arranged on the outer circumferential surface of the housing in such a way as to protrude in a direction perpendicular to an axial direction of the housing.

3. The LED bulb as set forth in claim 2, wherein each of the heat dissipating protrusions is tapered such that an area thereof increases in a direction from a lower portion to an upper portion of the housing.

4. The LED bulb as set forth in claim 1, wherein the inverter is connected to the socket via an electrode wire, and converts an alternating current, which is input from an outside through the socket, into a direct current, thus providing the direct current to the LED module.

5. The LED bulb as set forth in claim 3, wherein the housing is made of at least one of aluminum and magnesium.