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

• US 8,710,724 B2
• Filed: 11/18/2013
• Issued: 04/29/2014
• 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:
  US14/082,939
• Publication Number:
  US 20140071690A1
• Time in Patent Office: 162 Days
• Field of Search: 362/485, 362/487, 362/296.01, 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 includes a housing configured to be attached to a lamp holder; an LED module provided in the housing; a drive circuit provided in the housing and configured to drive the LED module to cause the LED module to emit light; an LED installation plate on which the LED module is installed; a cover arranged to block an optical axis of the LED module and configured to transmit light emitted from the LED module; and a separation member configured to separate the drive circuit from a space between the LED module and the cover in the housing. The LED installation plate has a rear surface, opposite the surface on which the LED module is installed. The rear surface is configured to closely contact the lamp holder, and is a part of the housing.

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;

an LED module provided in the housing;

a drive circuit provided in the housing and configured to drive the LED module to cause the LED module to emit light;

an LED installation plate on which the LED module is installed;

a cover arranged so as to block an optical axis of the LED module and configured to transmit light emitted from the LED module; and

a separation member configured to separate the drive circuit from a space between the LED module and the cover in the housing, wherein

the LED installation plate has a rear surface, opposite the surface on which the LED module is installed, the rear surface being configured to closely contact the lamp holder, and comprising a part of the housing.

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

the drive circuit is positioned in an outer peripheral space, between the LED module and the cover, in the housing and on a cover side relative to the LED module.

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

the drive circuit includes a power input terminal configured to be connected to an external power line when the LED light source lamp is attached to the lamp holder, and

the power input terminal is on a power supply terminal installation part positioned around the LED installation plate.

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

the separation member reflects and directs a part of light, emitted from the LED module, that is not directly incident onto the cover, toward the cover.

5. The LED light source lamp according to claim 1, further comprising a reflection diffusion member in the space between the LED module and the cover in the housing and configured to reflect and diffuse a part of light emitted from the LED module.

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

the drive circuit includes a primary side power source circuit and a switching transistor,

the primary side power source circuit and the switching transistor are positioned in an outer peripheral space, between the LED module and the cover, in the housing and at positions spaced from each other.

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

the LED installation plate has a higher thermal conductivity than a member provided around the rear surface of the LED installation plate.

8. The LED light source lamp according to claim 1, 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.

9. A lighting apparatus comprising:

the LED light source lamp according to claim 1; and

a lamp holder to which the LED light source lamp is attached, wherein

the lamp holder includes;

a thermal conductive member; and

an elastic deformation body configured to elastically deform to cause the thermal conductive member to closely contact the rear surface of the LED installation plate when the LED light source lamp is attached to the lamp holder.

10. The lighting apparatus according to claim 9, wherein

the elastic deformation body is a blade spring serving also as the thermal conductive member, and

the blade spring elastically deforms to closely contact the rear surface of the LED installation plate when the LED light source lamp is attached to the lamp holder.

11. The lighting apparatus according to claim 9, wherein

the elastic deformation body is a coil spring.

12. The lighting apparatus according to claim 9, wherein

the elastic deformation body is a rubber member.

13. A lighting apparatus comprising:

the LED light source lamp according to claim 1; and

a lamp holder to which the LED light source lamp is attached, wherein

the lamp holder includes a thermal conductive member configured to closely contact the rear surface of the LED installation plate when the LED light source lamp is attached to the lamp holder, and

at least one of the LED installation plate and the thermal conductive member is a magnet, and the other is a material that is attracted by the magnet.