LED bulb

• US 20030031015A1
• Filed: 05/16/2002
• Published: 02/13/2003
• Est. Priority Date: 08/13/2001
• Status: Active Grant

• Current Assignee: Atex Co., Ltd.
• Original Assignee: Atex Co., Ltd.
• Inventors: Ishibashi, Kazuo
• Granted Patent: US 6,709,132 B2
• Time in Patent Office: Days
• US Class Current: 362/249
• CPC Class Codes: F21K 9/232 specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
• 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 2107/00 Light sources with three-dimensionally disposed light-generating elements
• CPC Class Codes: F21Y 2107/20 on convex supports or substrates, e.g. on the outer surface of spheres
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H01L 25/13 the devices being of a type provided for in group H01L33/00
• 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: Y10S 362/80 Light emitting diode

Abstract

Provided is an LED bulb with a higher distribution of luminous intensity which is close to those of tungsten bulbs, in which the problem in directivity of the prior art LED bulbs has been solved while maintaining the advantages of an LED, that is, a long life and an energy saving characteristic. The LED bulb comprises a printed circuit board 5 which is flat when developed and is bendable to form a cage, a plurality of LEDs 6 which are disposed on the printed circuit board 5, and a transparent or semi-transparent cover 2 which encloses the printed circuit board 5 formed into the cage. The printed circuit board 5 may have a plurality of belt-like branches 5a which extend in radial directions from the center of the printed circuit board 5. The LED bulb may further comprise a power unit housing 8 for containing a power unit which supplies electric current to each of the LEDs 6.

Claims

1. An LED bulb comprising:

a printed circuit board which is flat when developed and is bendable to form a cage;

a plurality of LEDs which are disposed on the printed circuit board; and

a transparent or semi-transparent cover which encloses the printed circuit board formed into the cage.

2. The LED bulb according to claim 1, wherein said printed circuit board has a plurality of belt-like branches which extend in radial directions from a center of the printed circuit board.

3. The LED bulb according to claim 1, further comprising a housing for containing a power unit which supplies electric current to each of the LEDs.

4. The LED bulb according to claim 2, further comprising a housing for containing a power unit which supplies electric current to each of the LEDs.