LED LIGHT MODULE FOR OMNIDIRECTIONAL LUMINAIRE

• US 20080192480A1
• Filed: 10/31/2007
• Published: 08/14/2008
• Est. Priority Date: 05/08/2000
• Status: Active Grant

• Current Assignee: Farlight, LLC
• Original Assignee: Farlight, LLC
• Inventors: Rizkin, Alexander, Tudhope, Robert H.
• Granted Patent: US 8,360,615 B2
• Time in Patent Office: Days
• US Class Current: 362/310
• CPC Class Codes: B64D 2203/00 Aircraft or airfield lights using LEDs
• CPC Class Codes: B64F 1/20 Arrangement of optical beacons
• CPC Class Codes: E01F 9/559 illuminated
• CPC Class Codes: F21V 21/0824 Ground spikes
• CPC Class Codes: F21V 7/0008 providing for indirect lighting
• CPC Class Codes: F21V 7/0058 adapted to cooperate with light sources of shapes different from point-like or linear, e.g. circular light sources
• CPC Class Codes: F21V 7/0091 using total internal reflection
• CPC Class Codes: F21V 7/04 Optical design
• CPC Class Codes: F21V 7/048 with facets structure
• CPC Class Codes: F21W 2111/06 for aircraft runways or the like
• CPC Class Codes: F21Y 2103/10 comprising a linear array of point-like light-generating elements
• CPC Class Codes: F21Y 2103/33 annular
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

A light module including a single light emitting diode (LED) and a rotationally symmetrical reflective light transformer providing an omnidirectional pattern with a pre-calculated intensity distribution. In alternative embodiments the light module may consist of a plurality of LEDs and the reflective light transformer, having plurality of identical segments, provides an omnidirectional pattern with a pre-calculated intensity distribution as a result of superposition of the limited angle pattern reflected by each segment. In order to provide high efficiency the light transformer reflective surface profile is designed using a given LED'"'"'s spatial intensity distribution and required intensity distribution across the emitted omnidirectional pattern as a design parameters.

Claims

1. A light module including:

at least one light emitting diode (LED) emitting light with wide divergence; and

rotationally symmetrical reflective light transformer having a vertex located on the axis of symmetry coincident with LED optical axis, wherein in order to obtain high efficiency reflective light transformer surface profile is defined by the equation

R(α

;

θ

)=F{I_s(α

);

I_p(θ

) }

wherein R(α

;

θ

) is a light transformer reflective surface profile, α

is an angular coordinate relative to light transformer axis of symmetry belonging to the light source domain, θ

is an angular coordinate relative to orthogonal axis to light transformer axis of symmetry belonging to the pattern domain, I_s is a light source spatial intensity distribution, I_p(θ

) is required intensity distribution across emitted pattern, and F{ } is an arbitrary functional determined by the method of design, wherein reflective light transformer collects light emitted by LED, compresses, redistributes, and directs collected light with high efficiency in omnidirectional pattern with pre-calculated intensity distribution.

2. The light module according to claim 1, wherein the reflective light transformer surface consists of a plurality of circular facets, each facet collects a portion of the light emitted by the LED, compresses, redistributes and directs the collected light with high efficiency in the same omnidirectional pattern and superposition of light pattern from all facets results in omnidirectional pattern with pre-calculated intensity distribution.

3. A light module including:

a plurality of light emitting diodes (LEDs), each LED emitting light with wide divergence; and

a reflective light reflective light transformer consisting of a plurality of identical concave curved segments, each segment corresponding to an LED, wherein the LEDs optical axes parallel to reflective light transformer axis and in plane perpendicular to LEDs optical axes LEDS forming substantially a circular array with center of circle located on reflective light transformer axis, wherein concave curved segments reflective surface profile is defined by equation

R[(α

,β

);

θ

]=F{I_s(α

,β

);

I_p(θ

)}

where R[(α

,β

);

θ

] is a segment reflective surface profile, α

, β

are two dimensional angular coordinates belonging to the light source domain, θ

is an angular coordinate relative to orthogonal axis to light transformer axis of symmetry belonging to the pattern domain, α

, β

is a light source spatial intensity distribution, θ

is required intensity distribution across emitted pattern, and F{ } is an arbitrary functional determined by the method of design, wherein segment of reflective light transformer collects light emitted by associated LED, compresses, redistributes, and directs collected light with high efficiency in limited angle in the plane perpendicular to LEDs optical axes, and superposition of beams reflected by plurality of segments provided omnidirectional pattern with pre-calculated intensity distribution.

4. The light module according to claim 3, wherein concave curved segments reflective surface consist of plurality of facets, each facet collects portion of the light emitted by corresponding LED, compresses, redistributes, and directs collected light with high efficiency in the same limited angle pattern in the plane perpendicular to LEDs optical axes, and superposition of light pattern from all facets and all segments result omnidirectional pattern with pre-calculated intensity distribution.

5. A light module including:

a plurality of light emitting diodes (LEDs), each LED emitting light with wide divergence; and

a reflective light reflective light transformer consisting of a plurality of identical concave curved segments, wherein LEDs optical axes parallel to reflective light transformer axis and in plane perpendicular to LEDs optical axes LEDS forming substantially a polygon array with equal number of LED in each polygon side, number of polygon sides equal to number of concave curved segments and each segment corresponds to polygon side, wherein concave curved segments reflective surface profile is defined by equation

R[(α

,β

),θ

]=F{Σ

_nI_s(α

,β

);

I_p(θ

)}

where R[(α

,β

);

θ

] is a segment reflective surface profile, α

, β

are two dimensional angular coordinates belonging to the light source domain, θ

is an angular coordinate relative to orthogonal axis to light transformer axis belonging to the pattern domain, Σ

_nI_s(α

,β

) is combine spatial intensity distribution of all LEDs located on corresponding polygon side, _n is number of LED on polygon side, I_p(θ

)} is required intensity distribution across emitted pattern, and F{ } is an arbitrary functional determined by the method of design, wherein each segment of reflective light transformer collects light emitted by all LEDs located on corresponding polygon side, compresses, redistributes and directs collected light with high efficiency in limited angle in the plane perpendicular to LEDs optical axes, and superposition of pattern from plurality of segments provided omnidirectional pattern with pre-calculated intensity distribution.

6. The light module according to claim 5, wherein concave curved segments reflective surface consist of plurality of facets, each facet collects portion of the light emitted by all LEDs located on the corresponding polygon side, compresses, redistributes, and directs collected light with high efficiency in the same limited angle pattern in the plane perpendicular to LEDs optical axes, and superposition of light pattern from all facets and all segments result omnidirectional pattern with pre-calculated intensity distribution.