Lens for an LED-based light

• US 9,267,650 B2
• Filed: 03/13/2014
• Issued: 02/23/2016
• Est. Priority Date: 10/09/2013
• Status: Active Grant

• Current Assignee: Ilumisys Incorporated (Altair Engineering Incorporated)
• Original Assignee: Ilumisys Incorporated (Altair Engineering Incorporated)
• Inventors: Simon, David L., Amrine, James M. Jr.
• Primary Examiner(s): Sawhney, Hargobind S
• Application Number:
  US14/208,546
• Publication Number:
  US 20150098228A1
• Time in Patent Office: 712 Days
• Field of Search: 362/217.01, 362/219, 362/222, 362/223, 362/217.02, 362/217.04, 362/217.08, 362/217.13, 362/240, 362/244, 362/246, 362/249.01, 362/249.02, 362/260, 362/326, 362/329, 362/800
• US Class Current: 1/1
• CPC Class Codes: F21K 9/27 Retrofit light sources for lighting devices with two fittings for each light source, e.g. for substitution of fluorescent tubes
• CPC Class Codes: F21K 9/275 Details of bases or housings, i.e. the parts between the light-generating element and the end caps; Arrangement of components within bases or housings F21K9/278 takes precedence
• CPC Class Codes: F21K 9/60 Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
• CPC Class Codes: F21K 9/66 Details of globes or covers forming part of the light source
• CPC Class Codes: F21Y 2103/10 comprising a linear array of point-like light-generating elements
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

An LED-based replacement light for a fluorescent light includes a plurality of LEDs and an elongate housing for the LEDs. The housing is defined at least in part by a lens and has a cross sectional profile that partially falls along a cross sectional profile of a fluorescent light that the LED-based light is designed to replace. In addition, at least a portion of the lens extends beyond the cross sectional profile of the fluorescent light. The LED-based light also includes at least one connector arranged at an end of the housing that is configured for engagement with a socket of a fluorescent light fixture.

Claims

1. An LED-based replacement light for a fluorescent light, comprising:

a plurality of LEDs;

an elongate housing for the LEDs, the housing defined at least in part by an inner lens having a cross sectional profile that follows a portion of a cross sectional profile of a fluorescent light that the LED-based light is designed to replace, with an outer lens extending beyond the cross sectional profile of the fluorescent light and forming a space between the inner lens and the outer lens; and

at least one connector arranged at an end of the housing, the connector configured for engagement with a socket of a fluorescent light fixture.

2. The LED-based light of claim 1, wherein the inner lens at least partially encloses the plurality of LEDs and is configured to pass light that is emanated from the plurality of LEDs, and the outer lens is configured to diffusively transmit the light passed by the inner lens.

3. The LED-based light of claim 1, wherein both the inner lens and the outer lens have an at least partially curved cross sectional profile, with the inner lens and the outer lens sharing opposing longitudinally extending edges.

4. The LED-based light of claim 1, wherein the space between the inner lens and the outer lens is at least partially filled with a light transmitting material.

5. The LED-based light of claim 1, wherein the housing is further defined at least in part by an opaque lower portion, with the inner lens being attached to the lower portion such that an elongate junction is formed between the inner lens and the lower portion at the cross sectional profile of the housing, and wherein the outer lens at least partially projects beyond the junction.

6. The LED-based light of claim 5, wherein the outer lens that at least partially projects beyond the junction is a bulge.

7. The LED-based light of claim 5, wherein the outer lens is an angled side wall.

8. The LED-based light of claim 5, wherein at least a portion of the lower portion falls along the cross sectional profile of the fluorescent light.

9. The LED-based light of claim 1, wherein the plurality of LEDs are configured to emanate light at a first angle less than 180 degrees, and the inner lens and outer lens are configured to transmit light that is emanated from the LEDs at a second angle greater than 180 degrees.

10. An LED-based replacement light for a fluorescent light, comprising:

a plurality of LEDs;

an elongate housing for the LEDs, the housing at least partially defined by an opaque lower portion, an inner lens and an outer lens spaced apart from the inner lens, wherein the cross sectional profiles of the lower portion and the inner lens at least partially fall along a cross sectional profile of a fluorescent light that the LED-based light is designed to replace, with the outer lens extending beyond the cross sectional profile of the fluorescent light; and

at least one connector arranged at an end of the housing, the connector configured for engagement with a socket of a fluorescent light fixture.

11. The LED-based light of claim 10, wherein radially outer portions of the cross sectional profiles of the lower portion and the inner lens substantially fall along the cross sectional profile of the fluorescent light.

12. The LED-based light of claim 10, wherein a radially outer portion of a cross sectional profile of the inner lens substantially falls along only a minor arc of the cross sectional profile of the fluorescent light, both the inner lens and the outer lens share opposing longitudinally extending edges located at opposing elongate junctions formed at the lower portion, and the outer lens at least partially projects beyond each of the junctions.

13. The LED-based light of claim 12, wherein a portion of the outer lens projects beyond each of the junctions as a bulge.

14. The LED-based light of claim 12, wherein a portion of the outer lens projects beyond each of the junctions as an angled side wall.

15. The LED-based light of claim 12, wherein both the inner lens and the outer lens have an at least partially curved cross sectional profile.

16. The LED-based light of claim 10, wherein the inner lens at least partially encloses the plurality of LEDs and is configured to substantially pass light that is emanated from the plurality of LEDs, and the outer lens is configured to diffusively transmit the light passed by the inner lens at an angle greater than 180 degrees.

17. An LED-based light, comprising:

a plurality of LEDs;

an elongate housing for the LEDs, the housing at least partially defined by an inner lens and an outer lens spaced from the inner lens, wherein both the inner lens and the outer lens have an at least partially curved cross sectional profile facing in a common direction away from the plurality of LEDs the housing having a circular cross-section with the inner lens forming a portion of the circumference of the circular cross section; and

at least one connector arranged at an end of the housing, the connector configured for engagement with a socket of a fluorescent light fixture.

18. The LED-based light of claim 17, wherein the outer lens overlays the inner lens and is attached to the inner lens at opposed longitudinally extending edges, with the inner lens and the outer lens together forming a closed and generally crescent shaped cross sectional profile.