LAMP HAVING OUTER SHELL TO RADIATE HEAT OF LIGHT SOURCE

• US 20100244694A1
• Filed: 06/04/2010
• Published: 09/30/2010
• Est. Priority Date: 04/08/2005
• Status: Abandoned Application

• Current Assignee: Toshiba Lighting & Technology Corporation (Toshiba Corporation)
• Original Assignee: Toshiba Lighting & Technology Corporation (Toshiba Corporation)
• Inventors: Morikawa, Kazuto, OSAWA, SHIGERU
• Application Number:
  US12/794,476
• Publication Number:
  US 20100244694A1
• Time in Patent Office: Days
• US Class Current: 315/32
• 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, a heat radiating surface exposed to the outside of the outer shell, and a receptacle provided inside the heat radiating surface, and the light source support formed integrally with the heat radiating surface;

a base coupled to the outer shell;

a heat generating light source which is supported on the light source support, and thermally connected to the light source support;

a lighting circuit which lights the light source, the lighting circuit having a circuit board on which circuit components are mounted, and contained in the receptacle so that the circuit board extends along the axial direction of the outer shell; and

a translucent cover which is provided in the outer shell so as to cover the light source.

2. The lamp of claim 1, wherein the receptacle is opened to a space inside the base, and a part of the lighting circuit is projected to the space inside the base.

3. The lamp of claim 1, further comprising an electrical insulating layer interposed between the receptacle and the lighting circuit.

4. The lamp of claim 3, wherein the outer shell includes a peripheral wall having the heat radiating surface and an end wall partitioning the receptacle and the light source support;

the receptacle has an open end faced to the end wall; and

the base closes the open end (12a) of the receptacle.

5. The lamp of claim 4, wherein a part of the circuit board is projected from the open end of the receptacle to the inside of the base.

6. The lamp of claim 5, wherein the circuit board of the lighting circuit is held between the end wall of the outer shell and the base.

7. The lamp of claim 4, wherein the receptacle is defined by the end wall and the peripheral wall;

and the electrical insulating layer has a peripheral wall which covers the internal circumference of the peripheral wall of the outer shell, and a closed wall which covers the inside of the end wall of the outer shell.

8. The lamp of claim 7, wherein the circuit board of the lighting circuit having a first surface and a second surface opposite to the first surface, and the circuit components mounted on the first and second surfaces;

and the lighting circuit is contained in the receptacle with the first and second surfaces faced to the internal circumference of the peripheral wall.

9. The lamp of claim 1, wherein the outer shell has a recession surrounding the light source support, and the translucent cover has an edge portion to fit in the recession.

10. The lamp of claim 1, wherein the light source is a light-emitting diode.