Lamp having outer shell to radiate heat of light source

• US 8,398,272 B2
• Filed: 03/09/2011
• Issued: 03/19/2013
• 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
• Primary Examiner(s): McManmon, Mary
• Application Number:
  US13/044,369
• Publication Number:
  US 20110156569A1
• Time in Patent Office: 741 Days
• Field of Search: 362/240, 362/249.01, 362/249.05, 362/264, 362/265, 362/373, 362/543, 362/544, 362/545, 362/646, 362/650, 362/218, 362/294, 362/345, 362/547, 362/249.02, 165/80.3, 165/185
• US Class Current: 362/294
• 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:

a heat conductive outer shell having;

a peripheral portion,

a light source provided on one end of the peripheral portion, and

a recess opening provided at another end of the peripheral portion;

a base provided at an end of the outer shell;

a light source mounted on the light source support to transfer heat to the light source support;

a lighting circuit housed in the recess;

an insulating member provided between the lighting circuit and an inner surface of the recess;

a plurality of fins having a first end and a second end; and

a heat shielding cover physically supporting the first end of each of the plurality of fins, the plurality of fins defining a plurality of distinct heat radiating paths extending in the axial direction of the outer shell,

wherein the plurality of fins are configured to define the plurality of distinct heat radiating paths such that an ascending air current generated in each of the heat radiating paths flows from the lower side to the upper side of the heat radiating paths when a heat of the light source is conducted to the outer shell;

wherein the outer shell further includes an end wall partitioning the light source support and the recess, and wherein a heat shielding gap is provided between the end wall and the insulating member.

2. The lamp of claim 1, wherein the heat radiating paths are disposed between the peripheral portion of the outer shell and an inner surface of the heat shielding cover.

3. The lamp of claim 2, wherein each of the plurality of heat radiating fins protrude from the peripheral portion and extend to the heat shielding cover.

4. The lamp of claim 1, wherein the plurality of distinct heat radiating paths are circumferentially distinct from one another.

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

6. The lamp of claim 1, wherein one end of the heat radiating paths is opened to the outside of the outer shell through a first port and another end of the heat radiating paths is opened to the outside of the outer shell through a second port.

7. The lamp of claim 1, wherein one or more of the heat radiating paths are devoid of other fins.

8. The lamp of claim 1, wherein the second end of each of the plurality of fins is physically supported by heat conductive outer shell.

9. A lamp comprising:

an outer shell with a light source support and a recess;

a lighting circuit housed in the recess;

a light source supported on the light source support to transfer heat to the light source support; and

a heat shielding cover physically supporting an end of each of a plurality of fins configured to define a plurality of distinct heat radiating paths extending continuously in the axial direction of the outer shell, the heat radiating paths having a first end which is connected to the outside of the outer shell by a first port and a second end which is connected to the outside of the outer shell by a second port, wherein the plurality of fins are configured to define the plurality of distinct heat radiating paths such that an ascending air current is generated in each of the heat radiating paths when a heat of the light source is conducted to the outer shell,

wherein the outer shell further includes an end wall partitioning the light source support and the recess, and wherein a heat shielding gap is provided between the end wall and the insulating member.

10. A lamp comprising:

a heat conductive outer shell having a peripheral portion, a light source support provided on one end of the peripheral portion and a recess opening provided at another end of the peripheral portion;

a base provided on an end of the outer shell;

a light source mounted on the light source support to transfer heat to the light source support;

a lighting circuit housed in the recess;

an insulating member provided between the lighting circuit and an inner surface of the recess; and

a heat shielding cover defining, with the peripheral portion of the outer shell, a heat radiating path, the heat radiating path extending in the axial direction of the outer shell, wherein the heat shielding cover and the peripheral portion of the outer shell are configured to define the heat radiating path such that an ascending air current generated in the heat radiating path flows from the lower side to the upper side of the heat radiating path when a heat of the light source is conducted to the outer shell, wherein the outer shell further includes an end wall partitioning the light source support and the recess, and wherein a heat shielding gap is provided between the end wall and the insulating member.