LAMP HAVING OUTER SHELL TO RADIATE HEAT OF LIGHT SOURCE

• US 20110309386A1
• Filed: 08/30/2011
• Published: 12/22/2011
• Est. Priority Date: 04/08/2005
• Status: Active Grant

• Current Assignee: Toshiba Lighting & Technology Corporation (Toshiba Corporation)
• Original Assignee: Toshiba Lighting & Technology Corporation (Toshiba Corporation)
• Inventors: Osawa, Shigeru, Morikawa, Kazuto
• Granted Patent: US 8,858,041 B2
• Time in Patent Office: Days
• US Class Current: 257/88
• 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

A lamp includes an outer shell having heat conductivity, a base provided in the outer shell, and a cover provided in the outer shell. The outer shell has a light source support, and a heat radiating surface exposed to the outside of the outer shell. The light source support is formed integral with the heat radiating surface. A light source is supported on the light source support. The light source is heated during lighting, and thermally connected to the light source support. The light source is covered with the cover.

Claims

1. A lamp comprising:

an outer shell with heat conductivity which includes a light source support, and a heat radiating surface exposed to the out side of the outer shell, and the light source support formed integrally with the heat radiating surface;

a base which is provided in the outer shell;

a board which is fixed to the light source support through a screw at the center thereof, and being thermally connected to the light source support;

a plurality of heat generating light-emitting elements mounted on the board, the light-emitting elements provided at positions almost evenly apart from the center of the board so as to surround the screw; and

a translucent cover which is provided in the outer shell so as to cover the light-emitting elements.

2. The lamp of claim 1, wherein the light-emitting elements are arranged around the screw with intervals between each other.

3. The lamp of claim 1, wherein the board is thermally connected to the light source support so as to conduct heat generated by the light-emitting elements to the light source support.

4. The lamp of claim 1, wherein the light source support of the outer shell comprises a flat supporting surface to which the board is faced, and a screw hole opened at the center of the supporting surface, the screw penetrating the board and inserted into the screw hole.