LED light source lamp having drive circuit arranged in outer periphery of led light source

• US 8,604,679 B2
• Filed: 02/02/2011
• Issued: 12/10/2013
• 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, Namura, Toshiyuki, Kakuno, Yoshinori, Sugita, Kazushige
• Primary Examiner(s): Green, Tracie Y
• Application Number:
  US13/574,048
• Publication Number:
  US 20120319555A1
• Time in Patent Office: 1,042 Days
• Field of Search: 362/296.01, 362/485, 362/487, 257 98- 99, 313/116
• 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 configured to be used by being attached to a lamp holder, the LED light source lamp comprising:

a housing configured to be attached to the lamp holder;

a drive circuit provided in the housing;

an LED installation plate arranged, in a main space in the housing, on an attachment side of the LED light source lamp 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 to block an optical axis of light emitted by each of the at least one LED of the LED module, the light diffusion member transmitting light, wherein

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

the LED light source lamp 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 a part of light, emitted from the LED module, that is not directly incident onto the light diffusion member, toward the light diffusion member.

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

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

3. The LED light source lamp according to claim 1, wherein the drive circuit

is arranged in the outer peripheral space, divided in two portions spaced from each other, and

includes

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

a switching transistor located at the other of the two portions.

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

the LED installation plate has a rear surface, opposite the surface on which the LED module is installed, serving as an attachment surface for the lamp holder, and

the rear surface comprises a part of the housing.

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

the LED installation plate has a higher thermal conductivity than a member provided around the attachment side of the LED light source lamp to the lamp holder.

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

7. The LED light source lamp according to claim 6, 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 the external power line when the LED light source lamp is attached to the lamp holder.

8. The LED light source lamp according to claim 1, wherein the entire light diffusion member is positioned in front of the LED module in a direction of light emission from the LED light source lamp.

9. The LED light source lamp according to claim 1, wherein the drive circuit is positioned in the outer peripheral space between the LED module and the light diffusion member, in a direction transverse to a longitudinal direction of the LED light source lamp where a direction from the LED module toward the light diffusion member is the longitudinal direction.

10. The LED light source lamp according to claim 1, wherein the drive circuit is positioned in front of the LED module, in a direction of light emission from the LED light source lamp.

11. The LED light source lamp according to claim 1, wherein the housing extends in a direction of light emission from the LED light source lamp,

the LED module is provided on the LED installation plate, which is attached to an end of the housing in the direction of light emission, and

the light diffusion member is attached to an other end of the housing in the direction of light emission.

12. The LED light source lamp according to claim 1, wherein the separation member has a tapered shape expanding from the attachment side of the LED light source lamp to the lamp holder to a light emission side,

the LED module is positioned inside the tapered separation member, in a radial direction, and at an end of the separation member at the attachment side of the LED light source lamp,

the drive circuit is positioned outside the tapered separation member in the radial direction, and

the light diffusion member is positioned at an other end of the separation member.