Light-emitting element lamp and lighting equipment

• US 8,294,356 B2
• Filed: 06/04/2009
• Issued: 10/23/2012
• Est. Priority Date: 06/27/2008
• Status: Expired due to Fees

• Current Assignee: Toshiba Lighting & Technology Corporation (Toshiba Corporation)
• Original Assignee: Toshiba Lighting & Technology Corporation (Toshiba Corporation)
• Inventors: Osawa, Shigeru, Suwa, Takumi, Tanaka, Toshiya, Hisayasu, Takeshi
• Primary Examiner(s): Mai, Anh
• Assistant Examiner(s): QUARTERMAN, KEVIN J
• Application Number:
  US12/933,969
• Publication Number:
  US 20110089806A1
• Time in Patent Office: 1,237 Days
• Field of Search: 313 44- 46, 313/113, 313/493, 313/498, 313/512, 313/634, 313/318.01
• US Class Current: 313/498
• CPC Class Codes: F21K 9/23 Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
• CPC Class Codes: F21K 9/238 Arrangement or mounting of circuit elements integrated in the light source
• CPC Class Codes: F21K 9/68 Details of reflectors forming part of the light source
• CPC Class Codes: F21V 17/12 by screwing
• CPC Class Codes: F21V 21/30 Pivoted housings or frames
• CPC Class Codes: F21V 23/001 the elements being electrical wires or cables
• CPC Class Codes: F21V 23/006 the substrate being distinct from the light source holder
• CPC Class Codes: F21V 29/87 Organic material, e.g. filled polymer composites; Thermo-conductive additives or coatings therefor
• CPC Class Codes: F21V 31/005 Sealing arrangements therefor
• CPC Class Codes: F21V 31/04 Provision of filling media
• CPC Class Codes: F21V 7/0083 Array of reflectors for a cluster of light sources, e.g. arrangement of multiple light sources in one plane combination of two or more reflectors F21V7/0025
• 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
• CPC Class Codes: H01L 33/60 Reflective elements
• CPC Class Codes: H05B 45/30 Driver circuits
• CPC Class Codes: H05B 45/3574 Emulating the electrical or functional characteristics of incandescent lamps
• CPC Class Codes: Y02B 20/30 Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Abstract

The present invention provides a light-emitting element lamp 1 capable of preventing a temperature rise of a substrate 9, on which light-emitting elements 4 are mounted, by effectively utilizing a thermally conductive casing 2 and a thermally conductive cover 5.

The light emitting element lamp 1 includes a thermally conductive casing 2, a light source part 3, a thermally conductive cover 5, and an insulative cover 6. The thermally conductive casing 2 includes an irradiation opening 2b, is formed so as to be widened toward the irradiation opening 2b, has its outer circumferential surface exposed outwardly, and has a substrate mounting part 2c secured on its inner circumferential surface. The light source part 3 has a substrate 9 having the light-emitting elements 4 mounted thereon and causes the substrate 9 to be thermally coupled to and attached to the substrate mounting part 2c of the thermally conductive casing 2. The thermally conductive cover 5 is thermally coupled to and connected to the outer circumferential surface of the thermally conductive casing 2 in a surface-contacted state. The insulative cover 6 has one end side thereof connected to the thermally conductive cover 5, and the cap 7 is connected to the other end side thereof. The lighting circuit 12 controls lighting of the light-emitting elements 4 accommodated in the insulative cover 6.

Claims

1. A light-emitting element lamp including:

a thermally conductive substrate mounting part comprising a screw through-hole and an outer circumferential surface exposed outwardly;

a light source part comprising a substrate with light-emitting elements mounted thereon, the substrate being attached to the substrate mounting part so as to be thermally coupled to the substrate mounting part;

a thermally conductive cover comprising a first end with an annular connection part and a second end, the annular connection part being thermally coupled to and connected to the substrate mounting part, wherein a screw hole is disposed in the cover at a position opposing the screw through-hole of substrate mounting part, the cover is tapered radially inward from the first end to the second end, and a width of an inner space defined by an inside of the cover decreases from a portion of the inner space near the first end to a portion of the inner space near the second end;

an insulative cover comprising a first end and a second end, wherein the first end is connected to the thermally conductive cover and the second end comprises a cap connected thereto;

a lighting circuit which is accommodated in the insulative cover and is configured to control lighting of the light-emitting elements; and

a screw which is screwed in the screw hole of the thermally conductive cover via the screw through-hole of the substrate mounting part, the screw pressing and fixing the substrate mounting part against the connection part of the thermally conductive cover.

2. The light-emitting element lamp according to claim 1, wherein an annular groove is formed in the connection part of the thermally conductive cover, an O-ring is fitted in the groove, and the O-ring is pressed against the substrate mounting part and resiliently deformed.

3. Lighting equipment including:

an equipment main body comprising a socket;

a light-emitting element lamp according to claim 1, which is mounted in the socket of the equipment main body.

4. Lighting equipment including:

an equipment main body comprising a socket;

a light-emitting element lamp according to claim 2, which is mounted in the socket of the equipment main body,

5. The light-emitting element lamp according to claim 1, wherein the screw presses and fixes the light source part against the connection part of the thermally conductive cover together with the substrate mounting part.