Source: https://patents.google.com/patent/US10174908B2/en
Timestamp: 2019-06-17 23:42:06
Document Index: 709179367

Matched Legal Cases: ['§ 120', '§ 119', 'application No. 09807313', 'application No. 15170016', 'Application No. 08755907', 'Application No. 11006189', 'Application No. 11006190', 'Application No. 11006191', '§282']

US10174908B2 - LED device for wide beam generation - Google Patents
US10174908B2
US10174908B2 US15/083,076 US201615083076A US10174908B2 US 10174908 B2 US10174908 B2 US 10174908B2 US 201615083076 A US201615083076 A US 201615083076A US 10174908 B2 US10174908 B2 US 10174908B2
US15/083,076
US20160252230A1 (en
2010-01-20 Priority to US12/690,794 priority patent/US7942559B2/en
2010-06-07 First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=38459646&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=US10174908(B2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
2011-05-17 Priority to US13/109,609 priority patent/US8210722B2/en
2012-07-02 Priority to US13/540,477 priority patent/US8414161B2/en
2013-04-08 Priority to US13/858,713 priority patent/US8905597B2/en
2014-12-08 Priority to US14/563,081 priority patent/US9297520B2/en
2016-03-28 Priority to US15/083,076 priority patent/US10174908B2/en
2016-03-28 Application filed by Eaton Intelligent Power Ltd filed Critical Eaton Intelligent Power Ltd
2016-06-28 Assigned to ILLUMINATION MANAGEMENT SOLUTIONS, INC. reassignment ILLUMINATION MANAGEMENT SOLUTIONS, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HOLDER, RONALD G., RHOADS, GREG
2016-09-01 Publication of US20160252230A1 publication Critical patent/US20160252230A1/en
2018-11-07 Assigned to EATON INTELLIGENT POWER LIMITED reassignment EATON INTELLIGENT POWER LIMITED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ILLUMINATION MANAGEMENT SOLUTIONS, INC.
2019-01-08 Publication of US10174908B2 publication Critical patent/US10174908B2/en
2027-04-14 Adjusted expiration legal-status Critical
The present application is a continuation of and claims priority under 35 U.S.C. § 120 to U.S. patent application Ser. No. 14/563,081 filed on Dec. 8, 2014, which is a continuation of and claims priority to U.S. patent application Ser. No. 13/858,713 filed on Apr. 8, 2013, which is a continuation of U.S. patent application Ser. No. 13/540,477 filed on Jul. 2, 2012, now U.S. Pat. No. 8,414,161, which was a continuation of U.S. patent application Ser. No. 13/109,609 filed on May 17, 2011, now U.S. Pat. No. 8,210,722, which was a continuation of U.S. patent application Ser. No. 12/690,794 filed on Jan. 20, 2010 now U.S. Pat. No. 7,942,559; which was a division of U.S. patent application Ser. No. 11/711,218 filed on Feb. 26, 2007 now U.S. Pat. No. 7,674,018, which claims priority under 35 U.S.C. § 119 to U.S. Provisional Patent Application Ser. No. 60/777,310, filed on Feb. 27, 2006; U.S. Provisional Patent Application Ser. No. 60/838,035, filed on Aug. 15, 2006; and U.S. Provisional Patent Application Ser. No. 60/861,789, filed on Nov. 29, 2006, each of which are incorporated herein by reference. This application is also related to U.S. patent application Ser. No. 12/690,821 filed on Jan. 20, 2010 now U.S. Pat. No. 7,993,036; and U.S. patent application Ser. No. 13/109,582 filed on May 17, 2011.
FIG. 29 is a two dimensional iso-foot-candle plot of the light beam projected onto the ‘street’ from a device of the invention. This shows the nonradially symmetric output of a device of FIGS. 21-26. The designer has the freedom to control the shape of the lens to alter the output to match the requirements of the lighting task.
The method used to design the embodiment shown is to first select the primary director angle 6 for the highest intensity, shown in the polar graph of FIG. 3 as point 14. It has been determined by empirical testing that if this director angle passes much beyond 60-62 degrees from the centerline, the resultant effect is to limit the ability of the device 10 to perform its primary task of providing a significant increase in the iso-candela plot of the off-axis energy as shown by point 14 of FIG. 3 and still achieve the goal of a smooth, useful beam. In the embodiment of FIG. 3 the maximum intensity occurs at about 52 degrees off axis.
FIG. 5 shows a three quarter perspective view of another preferred embodiment 20 of the invention whereby the resultant beam energy pattern is not azimuthally symmetric. Circular lip 18 of FIGS. 6-9 represents a sealing feature that optionally allows the device 20 to be sealed when built into a light fixture or an array. The cross sectional view of FIG. 9 is taken through section line D-D of FIG. 5. The top plan view of the device 20 is represented by the diametrically opposing ‘blob’ segments 14 and the diametrically opposing smoother side segments 15 azimuthally orthogonal to the blob segments 14. It is easier to understand these profiles by looking at FIGS. 7 and 8, which show the profiles of the segments 14 and 15 from both horizontal and vertical directions respectively, and FIG. 6 which shows the device 20 in a rotated oblique view that shows its elongated profile. It can be seen in FIG. 7 that the illustrated profile in this view is similar to the device 20 shown in FIGS. 1 and 2. However, the similarity is lost when you examine the azimuthally orthogonal profile of FIG. 8. The ‘blob’ shape in the embodiment of FIG. 7 is defined by multiple cross-sections of segments 14 and 15 rotated about the centerline 23 in which the surface of lens 21 is lofted between cross-sections of segments 14 and 15 much like the lofting of a boat hull. By manipulating the shape of cross-sections of segments 14 and 15, the ‘blob’ or lobed segment 14 is defined as well as the smoothing of surface segments between the diametrically opposing ‘blobs’ or lobes 14.
FIGS. 12 and 13 are ray trace plots of the device of FIGS. 5-9.
These plots show graphically the path of energy from the LED emitter 29 in the planes corresponding to FIGS. 7 and 8 respectively. As in the device 10 of FIGS. 1 and 2, the surface of zone C of FIG. 9 is both refractive and totally internally reflective in this embodiment of the invention.
FIGS. 14 and 15 illustrate a further embodiment of the invention which incorporates a plurality of devices 21 or 20 of the invention by which a light module 40 is provided. This light module 40, either individually or in multiple copies, can be the basis of a flat luminaire that is used for street lighting, pathway lighting, parking structure lighting, decorative lighting and any other type of spread beam application. Light module 40 is shown as a rectangular flat bar, but can assume any two dimensional planar shape, such as square, circular, hexagonal, triangular or an arbitrary free form shape. Inasmuch as light module 40 is flat it can be mounted in its corresponding fixture parallel to the two dimensional plane that it is intended to illuminate, such as the street, walk or floor. This results in the light be directed in a spread beam toward the useful two dimensional pattern for which it is intended and not skyward or in other nonuseful directions. The light module 40 is a very simple and low cost means to provide LED lighting to luminaire manufacturers where the light module 40 can be treated in the designs of as a single ‘light bulb’. With the addition of heat sinking and power incorporated on or into module 40, the light module 40 can be easily incorporated into existing luminaires or integrated into new designs.
Optional surface 53 is a blended contour between surfaces 52 and 58. Surface 57 is mirrored across intersection 54 in FIG. 23 and is lofted in the embodiment shown to redirect the centerline energy of the LED down the ‘curb’ direction. Surface 57 allows for very high efficiency for the lens 21 in both the street and the curb side of its light pattern.
FIG. 33 summarizes an overall conceptualization of the methodology of the invention. The problem solved by the invention is defined by two boundary conditions, namely the light pattern of the light source which is chosen at step 100 and the two dimensional iso-foot candle plot which is to be projected onto the surface which is intended to be illuminated in step 106. In the illustrated embodiment the problem of providing a wide beam street light pattern is assumed for the boundary condition of step 106 and the Lambertian pattern of an LED is assumed in the boundary condition 100. Thus, it can readily be understood that the same problem defined by different characterizations of the boundary conditions of steps 100 and 106 are expressly included within the scope of the claimed invention. For example, if has already be expressly mentioned that boundary condition 100 need not assume the Lambertian pattern of an LED, but may take as the boundary condition the three dimensional energy distribution pattern of a high intensity discharge (HID) lamp.
an array of a number of light sources mounted to the substrate such that each light source is pointing in a same direction, each light source comprising:
a light emitting diode that has an axis; and
an optic that receives light from the light emitting diode and directs the received light to produce an illumination pattern that has a first intensity, wherein the optic comprises an inner hemispherical surface, the optic is symmetric with respect to a first reference plane passing through the axis, and the optic comprises a reflecting feature on a first side of a second reference plane, the second reference plane perpendicular to the first reference plane, wherein the reflecting feature reflects a portion of the light toward a second side of the second reference plane that is opposite the first side of the second reference plane,
wherein the array of the number of light sources produces a scaled version of the illumination pattern with a second intensity that substantially equals to the first intensity multiplied by the number.
2. The luminaire of claim 1, wherein the luminaire comprises a streetlight, and
wherein the illumination pattern is skewed so as to bias the scaled version of the illumination pattern street side relative to curbside for a streetlight installation.
3. The luminaire of claim 1, wherein the reflecting feature is a totally internally reflective surface that is oriented to skew the illumination pattern relative to the axis, and
wherein the array of the number of light sources comprises at least one light module.
4. The luminaire of claim 1, wherein the optic comprises an indentation, and
wherein the optic is substantially symmetrical about a plane of symmetry that is aligned with the indentation.
5. The luminaire of claim 1, wherein the optic comprises an indentation, and
wherein the optic is symmetrical about a reference plane that passes through the indentation.
a substrate configured for mounting above an area to be illuminated; and
a plurality of light sources that are mounted to the substrate such that each light source is disposed at a same angle with respect to the substrate, each light source comprising:
an optic that receives light from the light emitting diode and directs the received light to produce an illumination pattern, wherein the optic comprises an inner hemispherical surface, the optic is symmetric with respect to a first reference plane, and the optic comprises a light redirecting feature on a first side of a second reference plane, the second reference plane perpendicular to the first reference plane, wherein the light redirecting feature redirects a portion of the light toward a second side of the second reference plane that is opposite the first side of the second reference plane.
7. The luminaire of claim 6, wherein the plurality of light sources comprises an array of light sources within a streetlight.
8. The luminaire of claim 6, wherein the light redirecting feature is a refractive surface of the optic.
9. The luminaire of claim 6, wherein the light redirecting feature is a reflective surface of the optic.
10. The luminaire of claim 6, wherein the light redirecting feature is a surface of the optic that is both refractive and reflective.
11. The luminaire of claim 6, wherein the optic comprises an indentation on an outer surface of the optic.
12. The luminaire of claim 11, wherein the indentation is symmetric with respect to the first reference plane.
13. The luminaire of claim 6, wherein the substrate and the light sources form a light module.
14. The luminaire of claim 6, wherein the light emitting diode is centered with respect to the inner hemispherical surface of the optic.
15. The luminaire of claim 6, wherein each light emitting diode of the plurality of light sources has an axis and the first reference plane and the second reference plane pass through the axis.
16. A luminaire comprising:
a plurality of light sources that are mounted to the substrate at the same angle to the substrate and that collectively provide a collective beam pattern for illuminating the area, each of the light sources comprising:
an optic disposed adjacent the light emitting diode to form an individual beam pattern from light emitted by the light emitting diode, the optic comprising:
a first surface defining a hemispherical cavity disposed to receive the light emitted by the light emitting diode; and
a second surface that is disposed opposite the first surface and that is configured for creating asymmetry in the individual beam pattern.
17. The luminaire of claim 16, wherein the plurality of light sources comprises are disposed within a streetlight.
18. The luminaire of claim 16, wherein the second surface comprises a reflecting portion.
19. The luminaire of claim 18, wherein the reflecting portion is disposed at a periphery of the second surface.
20. The luminaire of claim 16, wherein the optic comprises an indentation on an outer surface of the optic.
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