Bulbtype lamp with light emitting diodes using alternating current

• US 8,545,050 B2
• Filed: 10/29/2008
• Issued: 10/01/2013
• Est. Priority Date: 11/27/2007
• Status: Expired due to Fees

• Current Assignee: Gwangsung Lighting Industry Co., Ltd.
• Original Assignee: Gwangsung Lighting Industry Co., Ltd.
• Inventors: Lee, Choong Hae
• Primary Examiner(s): Mai, Anh
• Assistant Examiner(s): COUGHLIN, ANDREW J
• Application Number:
  US12/744,922
• Publication Number:
  US 20110037386A1
• Time in Patent Office: 1,798 Days
• Field of Search: 362/244, 362/246, 313/45
• US Class Current: 362/246
• 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 9/61 using light guides
• 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 2115/10 Light-emitting diodes [LED]

Abstract

Provided is a bulbtype AC power LED lamp. The bulbtype AC power LED lamp includes an AC power LED board, a diffuser, a board base, an insulation base, a socket, and a bulb. The AC power LED board is in contact with the board base on which a heat sink is disposed to maximize heat emission efficiency during turn-on of the AC power LED. Also, light is diffused by the diffuser during turn-on of the AC power LED to prevent dazzling phenomenon as well as extend a lighting area.

Claims

1. A bulbtype AC power LED lamp comprising:

an AC power LED board (20) on which an AC power LED (21) is mounted;

a diffuser (20a) fixed to the AC power LED board (20) to surround the AC power LED (21), the diffuser (20a) diffusing light of the AC power LED (21);

a board base (30) in which the AC power LED board (20) is insertedly attached to the inside of a board fixing groove (31), side surfaces and a bottom surface of the AC power LED board (20) are in contact with an inner surface of the board fixing groove (31), a bulb fixing groove (31′

) extends along a circumference of the board fixing groove (31), a first power connection hole (32) passes through the board base (30);

a heat sink (33) disposed along an entire outer surface of the board base (30), wherein the heat sink (33) comes in contact with an outer periphery of the board base (30);

an insulation base (40) in which a second power connection hole (41) passing through the inside of the insulation base (40) and communicating with the first power connection hole (32) is defined, the insulation base (40) being connected to a lower end of the board base (30);

a socket (50) connected to a lower end of the insulation base (40), the socket (50) being inserted into the first power connection hole (32) and the second power connection hole (42) to supply an AC power to the AC power LED (21) through a power connection unit electrically connected to the AC power LED board (20); and

a bulb (60) inserted into the bulb fixing groove (31′

) to cover the AC power LED board (20),

wherein two or more AC power LEDs (21) are mounted on the AC power LED board (20), and all of the two or more AC power LEDs (21) are surrounded by a single diffuser (20b) to diffuse light, the single diffuser (20b) having a tube shape with a threaded outer periphery surface.

2. The bulbtype AC power LED lamp of claim 1, wherein:

the board base (30) includes an inner surface that faces the first power connection hole (32) in a radially inward direction and an outer periphery surface that faces an exterior in a radially outward direction;

the heat sink (33) includes an inner surface that faces in a radially inward direction and an outer surface that faces an exterior in a radially outward direction; and

the inner surface of the heat sink (33) covers and comes in contact with the outer periphery surface of the board base (30).

3. The bulbtype AC power LED lamp of claim 1, wherein:

the board base (30) has a shape of a hollow cylinder that includes an inner surface defining the first power connection hole (32) and an outer circumferential surface that faces an exterior in a radially outward direction;

the heat sink (33) includes an inner surface that faces in a radially inward direction and an outer surface that faces an exterior in a radially outward direction; and

the inner surface of the heat sink (33) covers and comes in contact with the outer circumferential surface of the board base (30).