Light-emitting device and illumination device

• US 8,360,606 B2
• Filed: 09/13/2010
• Issued: 01/29/2013
• Est. Priority Date: 09/14/2009
• Status: Expired due to Fees

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation), Toshiba Lighting & Technology Corporation (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation), Toshiba Lighting & Technology Corporation (Toshiba Corporation)
• Inventors: Kawashima, Seiko, Takei, Haruki, Oyaizu, Tsuyoshi, Yamaguchi, Yasunori
• Primary Examiner(s): Husar, Stephen F
• Assistant Examiner(s): CRANSON JR, JAMES W
• Application Number:
  US12/880,490
• Publication Number:
  US 20110063842A1
• Time in Patent Office: 869 Days
• Field of Search: 362/249.01, 362/249.02, 362/218, 362/294, 362/373, 362/396
• US Class Current: 362/249.01
• 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 9/232 specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
• CPC Class Codes: F21V 19/004 by deformation of parts or snap action mountings, e.g. using clips
• CPC Class Codes: F21V 19/0055 by screwing
• CPC Class Codes: F21V 29/773 the planes containing the fins or blades having the direction of the light emitting axis
• CPC Class Codes: F21V 29/83 the elements having apertures, ducts or channels, e.g. heat radiation holes
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H01L 23/40 Mountings or securing means for detachable cooling or heating arrangements heating H01L23/345; fixed by friction, plugs or springs
• 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

According to one embodiment, a light-emitting device includes a ceramic substrate, a plurality of light-emitting elements, and pressure member. The substrate includes a first surface in contact with a thermally radiative member, a second surface positioned in a side opposite to the first surface, and an outer circumferential surface which bridges outer circumferential edges of the first surface and the second surface. The light-emitting elements are mounted on the second surface of the substrate. The pressure member elastically press the substrate toward the thermally radiative member. A gap is provided between the pressure member and the outer circumferential surface of the substrate.

Claims

1. A light-emitting device comprising:

a ceramic substrate which comprises a first surface in contact with a thermally radiative member, a second surface positioned in a side opposite to the first surface, and an outer circumferential surface which bridges outer circumferential edges of the first surface and the second surface;

a plurality of light-emitting elements mounted on the second surface of the substrate; and

a pressure member which elastically presses the substrate toward the thermally radiative member, with a gap provided between the pressure member and the outer circumferential surface of the substrate.

2. The light-emitting device of claim 1, wherein the pressure member applies a load to the substrate in a direction toward the thermally radiative member, and the load applied to the substrate is 200 to 300 g.

3. The light-emitting device of claim 1, further comprising a power supply terminal provided on the second surface of the substrate, wherein the pressure member makes elastic contact with the power supply terminal, thereby applying a load to the substrate toward the thermally radiative member, and the load applied to the substrate is 70 to 300 g.

4. An illumination device comprising:

a body comprising a thermally radiative member;

a light-emitting device supported on the body; and

a lighting device which is provided on the body and turns on the light-emitting device, wherein

the light-emitting device comprises

a ceramic substrate which comprises a first surface in contact with the body, a second surface positioned in a side opposite to the first surface, and an outer circumferential surface which bridges outer circumferential edges of the first surface and the second surface,

a plurality of light-emitting elements mounted on the second surface of the substrate, and

a pressure member which elastically presses the substrate toward the body, with a gap provided between the pressure member and the outer circumferential surface of the substrate.

5. The illumination device of claim 4, wherein

the pressure member of the light-emitting device is a metal plate spring,

the plate spring comprises a fixing part fixed to the body, a pressure part in elastic contact with the second surface of the substrate, and a rising part bridging the fixing part and the pressure part, and

the gap is provided between the rising part and the outer circumferential surface of the substrate.

6. The illumination device of claim 5, wherein the light-emitting device further comprises a power supply terminal provided on the second surface of the substrate, and the pressure part is in elastic contact with the power supply terminal.

7. The illumination device of claim 4, wherein the light-emitting device further comprises a power supply terminal provided on the second surface of the substrate, and the pressure member of the light-emitting device comprises a holder supported on the body and an elastically deformable contact element provided on the holder, and

the gap is provided between the holder and the outer circumferential surface of the substrate, and the contact element makes elastic contact with the power supply terminal, thereby applying a load to the substrate toward the body.