LED LIGHT SOURCE LAMP

• US 20120319555A1
• Filed: 02/02/2011
• Published: 12/20/2012
• Est. Priority Date: 03/04/2010
• Status: Active Grant

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Nakagawa, Hiroki, Kakuno, Yoshinori, Sugita, Kazushige, Namura, Toshiyuki
• Granted Patent: US 8,604,679 B2
• Time in Patent Office: Days
• US Class Current: 313/116
• 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 9/68 Details of reflectors forming part of the light source
• CPC Class Codes: F21K 9/69 Details of refractors forming part of the light source
• CPC Class Codes: F21V 13/08 the elements being filters or photoluminescent elements and reflectors
• CPC Class Codes: F21V 19/00 Fastening of light sources or lamp holders fastening electric light source solely by the coupling device H01R33/00 ; special means for attaching candle to candle holder F21V35/003
• CPC Class Codes: F21V 23/009 the casing being inside the housing of the lighting device
• CPC Class Codes: F21V 29/70 characterised by passive heat-dissipating elements, e.g. heat-sinks
• CPC Class Codes: F21V 29/89 Metals
• CPC Class Codes: F21V 3/049 Patterns or structured surfaces for diffusing light, e.g. frosted surfaces
• CPC Class Codes: F21V 7/0033 with successive reflections from one reflector to the next or following
• CPC Class Codes: F21V 7/24 characterised by the material
• CPC Class Codes: F21Y 2105/10 comprising a two-dimensional array of point-like light-generating elements
• CPC Class Codes: F21Y 2113/13 comprising an assembly of point-like light sources
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [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

Abstract

An LED light source lamp has built-in drive circuits in a housing, and is used by being attached to a lamp holder. An LED installation plate is arranged, in a main space of the housing, on an attachment side to the lamp holder. An LED module on a surface, of the LED installation plate, opposite to the lamp holder, is a collection of LEDs driven by the drive circuit. A light diffusion member is arranged so as to block the optical axis of light emitted by each LED of the LED module. Here, the drive circuits are arranged in an outer peripheral space, between the LED module and the light diffusion member, so as not to block the optical axis of light emitted by each LED of the LED module.

Claims

1. An LED light source lamp including a built-in drive circuit in a housing thereof and configured to be used by being attached to a lamp holder, the LED light source lamp comprising:

an LED installation plate arranged, in a main space in the housing, on an attachment side to the lamp holder;

an LED module installed on a surface, of the LED installation plate, opposite to the lamp holder, and including at least one LED element that emits light by being driven by the drive circuit; and

a light diffusion member arranged so as to block an optical axis of light emitted by each of the at least one LED of the LED module, wherein

the drive circuit is arranged in an outer peripheral space, between the LED module and the light diffusion member, so as not to block the optical axis of light emitted by each of the at least one LED of the LED module.

2. The LED light source lamp according to claim 1, further comprising:

a separation member configured to separate the drive circuit from a space between the LED module and the light diffusion member to shield thermal radiation from the LED module, and configured to reflect and direct some of light, emitted from the LED module, that does not directly reach the light diffusion member, toward the light diffusion member.

3. The LED light source lamp according to claim 2, further comprising:

a reflection diffusion member arranged between the LED module and the light diffusion member so as to block some of the optical axis emitted by each of the at least one LED of the LED module, and configured to reflect and diffuse some of light emitted from the LED module.

4. The LED light source lamp according to claim 1, wherein

the drive circuit

is arranged in the outer peripheral space, divided in two positions distanced from each other, and

includes

a primary side power source circuit located at one of the two positions, and

a switching transistor located at the other position.

5. The LED light source lamp according to claim 1, wherein

the LED installation plate

has a rear surface, of the surface on which the LED module is installed, serving as an attachment surface to the lamp holder, and

forms a part of the housing.

6. The LED light source lamp according to claim 5, wherein

the LED installation plate has a higher thermal conductivity than a member around the attachment surface to the lamp holder.

7. The LED light source lamp according to claim 6, wherein

when the LED light source lamp is attached to the lamp holder, the LED installation plate closely contacts a thermal conductive member of the lamp holder.

8. The LED light source lamp according to claim 7, wherein

the drive circuit further includes

a power input terminal installed on an area where the LED installation plate is not arranged, and configured to be connected to an external power line when the LED light source lamp is attached to the lamp holder, and

the LED installation plate is not connected to an external power line when the LED light source lamp is attached to the lamp holder.