Lamp having outer shell to radiate heat of light source

• US 9,080,759 B2
• Filed: 06/04/2010
• Issued: 07/14/2015
• 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:
  US12/794,509
• Publication Number:
  US 20100237779A1
• Time in Patent Office: 1,866 Days
• Field of Search: 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, 362/363, 313/498, 313/318.04
• 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

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 configured to be installable in a lamp socket, the lamp comprising:

a shell with heat conductivity, the shell including;

a light source support provided at one end of the shell,

a peripheral wall extending from the light source support to another end of the shell, the peripheral wall having a shape whose outer diameter reduces from the one end of the shell to the other end of the shell, the peripheral wall including a heat radiating surface exposed to an exterior of the lamp, and

a receptacle provided inside the peripheral wall and having an open end on an opposite side of the light source support;

a heat generating light source supported on the light source support;

a lighting circuit configured to light the light source, the lighting circuit disposed in the receptacle and having a circuit board on which circuit components are mounted;

a translucent cover provided on the shell so as to cover the light source;

a base comprising;

a metal base shell configured to be installable in and directly contact the lamp socket to supply a current from the lamp socket to the lighting circuit; and

a connecting member having electrical insulation, the connecting member physically separating the metal base shell from the heat conductive shell and being fixed to the metal base shell,

wherein the connecting member further comprises a distal end on which an engaging portion is formed, wherein the connecting member is configured to be connected to the heat conductive shell by fitting the distal end inside the open end of the receptacle and inserting, in a radial direction, the engaging portion into a groove defined on an interior surface of the heat conductive shell,

wherein the connecting member separates the metal base shell and the heat conductive shell such that the heat conductive shell does not directly contact the lamp socket when the metal base shell is installed in the lamp socket,

wherein the heat conductive shell is not configured to supply current from the lamp socket to the lighting circuit,

wherein the receptacle extends into the connecting member, and

wherein the peripheral wall is configured such that a thickness of the peripheral wall decreases from the one end of the shell to the other end of the shell.

2. A lighting device comprising:

a shell having heat conductivity and including;

a light source support provided at one end of the shell, a peripheral wall extending from the light source support to another end of the shell, the peripheral wall having a shape whose outer diameter reduces from the one end of the shell to the other end of the shell and having an heat radiating surface exposed to an exterior of the lighting device, and a receptacle provided inside the peripheral wall and having an open end on the opposite side of the light source support;

a heat generating light source supported on the light source support;

a base portion including;

a metal base shell configured to directly contact a lamp socket to supply a current from the lamp socket to heat generating light source; and

a connecting member having electrical insulation and physically separating the metal base shell from the heat conductive shell, the connecting member being fixed to the base portion at one end and having an engaging portion at another end, wherein the engaging portion is configured to be inserted into, in a radial direction, a groove defined on an interior surface of the receptacle,

wherein the connecting member separates the metal base shell and the heat conductive shell such that the heat conductive shell does not directly contact the lamp socket when the metal base shell is installed in the lamp socket,

wherein the heat conductive shell is not configured to supply power to the heat generating light source,

wherein the receptacle extends into the base portion, and

wherein the peripheral wall is configured such that a thickness of the peripheral wall decreases from the one end of the shell to the other end of the shell.

3. A lamp configured to be installable in a lamp socket, the lamp comprising:

a shell with heat conductivity which includes a light source support, a receptacle having an open end on the opposite side of the light source support, and an end wall partitioning the light source support and the receptacle;

a heat generating light source supported on the light source support;

a lighting circuit configured to light the light source, the lighting circuit disposed in the receptacle and having a circuit board on which circuit components are mounted;

an electrical insulating layer interposed between a portion of the receptacle and the lighting circuit, wherein a heat shielding gap is provided between the end wall and the electrical insulating layer;

a translucent cover provided on the shell so as to cover the light source; and

a base comprising a metal base shell configured to be installable in and directly contact the lamp socket to supply a current from the lamp socket to the lighting circuit and a connecting member having electrical insulation, being fixed to the metal base shell, and having a distal end on which an engaging portion is formed, wherein the base is connected to the shell by fitting, in a radial direction, the engaging portion formed on the distal end of the connecting member into a groove defined in a surface of the receptacle,

wherein the metal base shell is physically separate from the shell, and

wherein the lamp is configured such that the shell does not directly contact the lamp socket when the lamp is installed in the lamp socket.

4. The lamp of claim 3, wherein the shell has a heat radiating surface exposed to the outside of the shell, and the connecting member has a peripheral surface which is adjacent to and continuous with the heat radiating surface of the shell.