Lamp having outer shell to radiate heat of light source

• US 9,234,657 B2
• Filed: 08/03/2012
• Issued: 01/12/2016
• Est. Priority Date: 04/08/2005
• Status: Expired due to Fees

• Current Assignee: Toshiba Lighting & Technology Corporation (Toshiba Corporation)
• Original Assignee: Toshiba Lighting & Technology Corporation (Toshiba Corporation)
• Inventors: Osawa, Shigeru, Morikawa, Kazuto
• Primary Examiner(s): McManmon, Mary
• Application Number:
  US13/566,453
• Publication Number:
  US 20120294005A1
• Time in Patent Office: 1,257 Days
• Field of Search: 313 44- 46, 362/218, 362/240, 362/249.01, 362/249.05, 362/264, 362/265, 362/294, 362/345, 362/373, 362543-545, 362/646, 362/650
• US Class Current: 1/1
• 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: F21K 9/238 Arrangement or mounting of circuit elements integrated in the light source
• CPC Class Codes: F21V 17/101 permanently, e.g. welding, gluing or riveting
• CPC Class Codes: F21V 23/002 Arrangements of cables or conductors inside a lighting device, e.g. means for guiding along parts of the housing or in a pivoting arm
• CPC Class Codes: F21V 23/006 the substrate being distinct from the light source holder
• CPC Class Codes: F21V 29/507 of means for protecting lighting devices from damage, e.g. housings
• CPC Class Codes: F21V 29/70 characterised by passive heat-dissipating elements, e.g. heat-sinks
• CPC Class Codes: F21V 29/713 in direct thermal and mechanical contact of each other to form a single system
• 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: F21V 29/89 Metals
• CPC Class Codes: F21V 3/00 Globes; Bowls; Cover glasses with refracting properties F21V5/00; with reflecting properties F21V7/00; characterised by cooling arrangements F21V29/506
• CPC Class Codes: F21V 9/08 for producing coloured light, e.g. monochromatic; for reducing intensity of light with provision for controlling the colour F21V9/40
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H05B 45/30 Driver circuits
• CPC Class Codes: Y02B 20/30 Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Abstract

According to one or more arrangements, a lamp may include a device body having heat conductive properties. The device body may include a light source support and a heat radiating surface forming at least a portion of an exterior surface of the lamp device. In some examples, the light source support may be integrally formed with the heat radiating surface. The light source support may further be thermally connected or fixed to a board in various manners (e.g., screw). The board may include a plurality of light-emitting elements mounted thereon. The lamp may further include a cover. In one example, the cover may be constructed of a translucent material.

Claims

1. A lamp device comprising:

a metallic device body having heat conductive properties, the device body including;

a light source support having a flat surface,

a heat radiating surface forming at least a portion of an exterior surface of the lamp device, wherein the light source support is integrally formed with the heat radiating surface,

an edge projecting farther in a certain direction than the flat surface, the edge having a first side provided on a side of the light source support so as to form an obtuse angle with respect to the flat surface and a second side facing an exterior of the lamp device; and

a receiving portion, a part of the receiving portion being at least partially composed of a side surface of the light source support;

a board fixed to the flat surface of the light source support through a screw, and being thermally connected to the light source support;

a plurality of light-emitting elements provided around the screw and mounted on the board;

a cover which is provided to the device body without using an adhesive so as to cover the plurality of light-emitting elements, while facing the flat surface of the light source support, a portion of the cover positioned inside the receiving portion contacting at least a part of the side surface of the light source support and contacting at least a part of the edge;

a base portion provided so as to be power-feedable to the light-emitting elements; and

a light-reflecting member, at least a portion of the light-reflecting member being positioned in the receiving portion, and provided along the first side of the edge and having a reflecting surface extending in at least the certain direction, the reflecting surface configured to reflect light from the plurality of light-emitting elements in a direction of the cover,

wherein the edge has an external surface forming a first heat radiating surface of the heat radiating surface, and

wherein a shape of at least a portion of the exterior surface of the device body reduces in diameter toward the base portion and the at least a portion of the exterior surface forms a second heat radiating surface of the heat radiating surface, the second heat radiating surface being different from the first heat radiating surface.

2. The lamp device of claim 1, wherein the cover is a translucent cover.

3. The lamp device of claim 1, wherein the light-emitting element is a heat generating light-emitting element.

4. The lamp device of claim 1, wherein the device body further comprises an opening along at least a portion of a central axis of the lamp device.

5. The lamp device of claim 1, wherein the second heat radiating surface extends in at least the other direction, different from the certain direction, perpendicular to the flat surface.

6. The lamp device of claim 1, wherein the device body has an engaged portion, the cover has an engagement edge, part of the light-reflecting member is provided along an inner surface of the engagement edge, and the engagement edge is engaged into the engaged portion, together with the light-reflecting member.

7. The lamp device of claim 1, wherein the board includes an electrical connection part for feeding the plurality of light-emitting elements, and the device body has a through hole from which one end of a wire, is extended out from the through hole to be connected, in a curved state, to the electric connection part, wherein another end of the wire is electrically connected to a lighting circuit.

8. The lamp device of claim 1, wherein the certain direction is perpendicular to the flat surface of the light source support.

9. The lamp device of claim 1, wherein the edge projects diagonally away from the flat surface of the light source support.

10. The lamp device of claim 1, wherein the cover is translucent and the light-reflecting member is disposed on an interior side of the cover.

11. A lamp device comprising:

a metallic device body having heat conductive properties, the device body including;

a light source support having a flat surface,

a heat radiating surface forming at least a portion of an exterior surface of the lamp device, wherein the light source support is integrally formed with the heat radiating surface,

an edge projecting farther in a certain direction than the flat surface, the edge having a first side provided on a side of the light source support so as to form an obtuse angle with respect to the flat surface and a second side facing an exterior of the lamp device; and

a receiving portion, a part of the receiving portion being composed of a side surface of the light source support;

a board fixed to the flat surface of the light source support through a fixing member, and being thermally connected to the light source support;

a plurality of light-emitting elements provided around the fixing member and mounted on the board;

a cover which is provided to the device body without using an adhesive so as to cover the plurality of light-emitting elements, while facing the flat surface of the light source support, a portion of the cover contacting at least a part of the a side surface of the light source support, and contacting at least a part of the edge, the side surface of the light source support being disposed closer to the flat surface, in a direction parallel to the flat surface, than the edge to the flat surface;

a base portion provided so as to be power-feedable to the light-emitting elements; and

a light-reflecting member, at least a portion of the light-reflecting member being positioned in the receiving portion, and provided along the first side of the edge and having a reflecting surface extending in at least the certain direction, the reflecting surface configured to reflect light from the plurality of light-emitting elements in a direction of the cover,

wherein the edge has an external surface forming a first heat radiating surface of the heat radiating surface, and

wherein a shape of at least a portion of the exterior surface of the device body reduces in diameter toward the base portion and the at least a portion of the exterior surface forms a second heat radiating surface of the heat radiating surface, the second heat radiating surface being different from the first heat radiating surface.

12. The lamp device of claim 11, wherein the cover further contacts a surface on the first side of the edge, the surface of the edge being spaced apart from the side surface of the light source support.