Light bulb assembly having internal redirection element for improved directional light distribution

• US 9,651,219 B2
• Filed: 08/10/2015
• Issued: 05/16/2017
• Est. Priority Date: 08/20/2014
• Status: Active Grant

• Current Assignee: Elumigen Llc
• Original Assignee: Elumigen Llc
• Inventors: Dassanayake, Mahendra, Petku, Brian
• Primary Examiner(s): Tso, Laura
• Application Number:
  US14/821,864
• Publication Number:
  US 20160053966A1
• Time in Patent Office: 645 Days
• Field of Search: 36229606, 362650, 362235, 36224902, 362247, 362244
• 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 9/65 specially adapted for changing the characteristics or the distribution of the light, e.g. by adjustment of parts
• CPC Class Codes: F21V 14/04 by movement of reflectors in vehicle head lamps F21S41/675
• CPC Class Codes: F21V 7/0008 providing for indirect lighting
• CPC Class Codes: F21V 7/0016 on lighting devices that also provide for direct lighting, e.g. by means of independent light sources, by splitting of the light beam, by switching between both lighting modes
• CPC Class Codes: F21V 7/041 with conical or pyramidal surface
• CPC Class Codes: F21V 7/045 with spherical surface
• CPC Class Codes: F21V 7/06 with parabolic curvature
• CPC Class Codes: F21V 7/07 with hyperbolic curvature
• CPC Class Codes: F21V 7/08 with elliptical curvature
• CPC Class Codes: F21Y 2103/33 annular
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

A light assembly includes a cover having an upper portion and a redirection portion. The cover has a longitudinal axis and a housing that is coupled to the cover. A lamp base is coupled to the housing. A circuit board is disposed within the housing. The circuit board has a plurality of light sources thereon. An internal redirection element is coupled to the circuit board and has a curvilinear shaped surface for reflecting a first portion of light from the plurality of light sources through the redirection portion of the cover and transmitting a second portion of light therethrough.

Claims

1. A light assembly comprising:

a cover having an upper portion and a redirection portion, said cover having a longitudinal axis and an interior;

a housing coupled to the cover;

a lamp base coupled to the housing;

a circuit board disposed within the housing, said circuit board having a plurality of light sources thereon; and

an internal redirection element coupled to the circuit board having a curvilinear shaped surface for reflecting a first portion of light from the plurality of light sources toward the redirection portion of the cover and transmitting a second portion of light through the internal redirection element,

wherein at least a first part of the first portion of light is reflected from the redirection portion of the cover and is reflected to the interior of the cover and then through the cover.

2. The light assembly as recited in claim 1 wherein a second part of the first portion of light is directed out of the light assembly through the redirection portion.

3. The light assembly as recited in claim 1 wherein the curvilinear shaped surface comprises a conic cross section.

4. The light assembly as recited in claim 1 wherein the curvilinear shaped surface comprises a conic cross section rotated about the longitudinal axis.

5. The light assembly as recited in claim 4 wherein the conic cross section comprises a partial paraboloid.

6. The light assembly as recited in claim 4 wherein the conic cross section comprises a partial ellipsoid.

7. The light assembly as recited in claim 4 wherein the conic cross section comprises a partial spheroid.

8. The light assembly as recited in claim 4 wherein the conic cross section comprises a partial hyperboloid.

9. The light assembly as recited in claim 1 wherein the curvilinear shaped surface comprises a conic cross section having an axis disposed at an angle relative to a surface of the circuit board, said conic cross section is rotated about the longitudinal axis of the light assembly.

10. The light assembly as recited in claim 1 wherein the curvilinear shaped surface comprises a conic cross section having an axis disposed at an angle relative to a surface of the circuit board by a predetermined angle, said conic cross section is rotated about the longitudinal axis of the light assembly.

11. The light assembly as recited in claim 10 wherein the axis intersects a ring comprising the plurality of light sources.

12. The light assembly as recited in claim 11 wherein the ring is a focal line for the redirection portion of the cover.

13. The light assembly as recited in claim 12 wherein the redirection portion of the cover comprises a partial ellipsoid.

14. A light assembly comprising:

a cover having an upper portion and a redirection portion, said cover having a longitudinal axis;

a housing coupled to the cover;

a lamp base coupled to the housing;

a circuit board disposed within the housing, said circuit board having a plurality of light sources thereon; and

an internal redirection element coupled to the circuit board having a curvilinear shaped surface for reflecting a first portion of light from the plurality of light sources toward the redirection portion of the cover and transmitting a second portion of light through the internal redirection element,

wherein the internal redirection element comprises a transparent portion.

15. A light assembly comprising:

a cover having an upper portion and a redirection portion, said cover having a longitudinal axis;

a housing coupled to the cover;

a lamp base coupled to the housing;

a circuit board disposed within the housing, said circuit board having a plurality of light sources thereon; and

an internal redirection element coupled to the circuit board having a curvilinear shaped surface for reflecting a first portion of light from the plurality of light sources toward the redirection portion of the cover and transmitting a second portion of light through the internal redirection element,

wherein the internal redirection element comprises a gap between the circuit board and a plurality of supports coupling the internal redirection element to the circuit board.