EP4239244A1 - Optique de commande de faisceau de coupure extrême - Google Patents

Optique de commande de faisceau de coupure extrême Download PDF

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Publication number
EP4239244A1
EP4239244A1 EP23160000.8A EP23160000A EP4239244A1 EP 4239244 A1 EP4239244 A1 EP 4239244A1 EP 23160000 A EP23160000 A EP 23160000A EP 4239244 A1 EP4239244 A1 EP 4239244A1
Authority
EP
European Patent Office
Prior art keywords
reflector
lenses
base
leds
optical assembly
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP23160000.8A
Other languages
German (de)
English (en)
Inventor
Qi AI
Jie Chen
Craig Eugene Marquardt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ABL IP Holding LLC
Original Assignee
ABL IP Holding LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US17/686,799 external-priority patent/US11746989B1/en
Application filed by ABL IP Holding LLC filed Critical ABL IP Holding LLC
Publication of EP4239244A1 publication Critical patent/EP4239244A1/fr
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00—Lighting devices intended for fixed installation
    • F21S8/08—Lighting devices intended for fixed installation with a standard
    • F21S8/085—Lighting devices intended for fixed installation with a standard of high-built type, e.g. street light
    • F21S8/086—Lighting devices intended for fixed installation with a standard of high-built type, e.g. street light with lighting device attached sideways of the standard, e.g. for roads and highways
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V13/00—Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
    • F21V13/02—Combinations of only two kinds of elements
    • F21V13/04—Combinations of only two kinds of elements the elements being reflectors and refractors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • F21V5/007—Array of lenses or refractors for a cluster of light sources, e.g. for arrangement of multiple light sources in one plane
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/0083—Array of reflectors for a cluster of light sources, e.g. arrangement of multiple light sources in one plane
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/04—Optical design
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V11/00—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/04—Optical design
    • F21V7/06—Optical design with parabolic curvature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/04—Optical design
    • F21V7/09—Optical design with a combination of different curvatures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2131/00—Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
    • F21W2131/10—Outdoor lighting
    • F21W2131/103—Outdoor lighting of streets or roads
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2105/00—Planar light sources
    • F21Y2105/10—Planar light sources comprising a two-dimensional array of point-like light-generating elements
    • F21Y2105/14—Planar light sources comprising a two-dimensional array of point-like light-generating elements characterised by the overall shape of the two-dimensional array
    • F21Y2105/16—Planar light sources comprising a two-dimensional array of point-like light-generating elements characterised by the overall shape of the two-dimensional array square or rectangular, e.g. for light panels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • This disclosure relates generally to an optical assembly that can be used in luminaires and other light elements, and more particularly to reflectors around light emitting diodes (LED) to direct light beams from LEDs in a desired direction while cutting off the light beams from travelling in an undesired direction.
  • LED light emitting diodes
  • LED Light emitting diodes
  • LED lights used in roadway luminaires typically include a series of LEDs arranged in rows, with the LEDs being covered by an optic designed to provide a particular light distribution profile.
  • it may be desirable to direct light toward a desired direction such as toward a street, parking lot, or other area
  • a desired direction such as toward a street, parking lot, or other area
  • light from being directed toward an undesired direction to leave other areas, such as unpaved areas, buildings, yards, and the like, unlit.
  • traditional lighting systems may not provide the ability to carefully cutoff off light such that predominately all light emitted from the lighting system is emitted in a desired direction. Therefore, improvements in light cutoff capabilities of lighting systems are desired.
  • the optical assembly configured to direct light in a desired direction.
  • the optical assembly includes a base, a plurality of lenses disposed on the base and spaced from each other in a row. Each lens may have a dome shape with a central or optical axis perpendicular to a plane of the base.
  • the optical assembly can include a plurality of light emitting diodes (LED). Each LED can be disposed between the base and a respective lens of the plurality of lenses. Each LED can have a central axis perpendicular to a plane of the LED. The central axis of an LED may be offset from the central axis of the respective lens of the plurality of lenses.
  • LED light emitting diodes
  • At least one reflector having a curved surface may be disposed adjacent to at least one of the plurality of LEDs such that the at least one of the plurality of LEDs are at a first side of the at least one reflector.
  • the curved surface may extend from the base and curve over the at least one of the plurality of LEDs and beyond the central axis of each of the at least one of the plurality of LEDs.
  • the curved surface can be configured to direct light emitted by the at least one of the plurality of LEDs toward the first side and prevent the light from leaking toward a second side of the at least one reflector that is opposite the first side.
  • each lens of the plurality of lenses defines a cavity
  • each LED of the plurality of LEDs may be disposed in a respective one of the cavities such that the central axis of the LED is offset relative to a central axis of the respective lens in a direction of the curved surface of the at least one reflector.
  • the curved surface of the reflector may have a free form shape characterized by multiple curvatures between end points of the curved surface, a first end point being at the base and a second end point being positioned above at least some of the plurality of lenses.
  • a first curvature may be between the first end point at the base and an intermediate point between the first end point and the second end point
  • a second curvature may be between the intermediate point and the second end point of the curved surface.
  • the curved surface of the reflector may be characterized by a first angle between a plane of the base and a first line (e.g., joining a distal end of a lens furthest from the curved surface and a distal end of the curved surface located over the lens).
  • the first angle is in a range between 60° and 90°.
  • the curved surface of the reflector may be characterized by a second angle between the plane of the base and a second line (e.g., a line joining a point on the lens located at the central axis of the LED and the distal end of the curved surface located over the lens).
  • the second angle is in a range between 70° and 130°.
  • the luminaire includes a base, a plurality of lenses disposed on the base and spaced from each other, a plurality of light emitting diodes (LED) disposed between the base and a respective lens of the plurality of lenses, at least one reflector having a curved surface and disposed proximate to at least one of the plurality of LEDs, and a frame supporting the base and the at least one reflector.
  • LED light emitting diodes
  • each lens may have a dome shape having a central axis perpendicular to a plane of the base.
  • each LED may have a central axis perpendicular to a plane of the LED, and the central axis of an LED may be offset from the central axis of a respective lens of the plurality of lenses.
  • the curved surface of the reflector may extend from a surface of the base and curve over the at least one of the plurality of LEDs and beyond the central axis of the at least one of the plurality of LEDs.
  • the curved surface may be configured to direct light emitted by the at least one of the plurality of LEDs toward the first side and prevent the light from leaking toward a second side of the at least one reflector that is opposite the first side.
  • the frame may be oriented such that the curved surface of the at least one reflector curves toward the street to direct the light from the at least one of the plurality of LEDs toward a street side and prevent light from leaking in a direction that is away from the street.
  • top,” “bottom,” “front,” “side,” “length,” “lower,” “interior,” “inner,” “outer,” and the like merely describe points of reference and do not necessarily limit embodiments of the present disclosure to any particular orientation or configuration.
  • terms such as “first,” “second,” “third,” etc. merely identify one of a number of portions, components, steps, operations, functions, and/or points of reference as disclosed herein, and likewise do not necessarily limit embodiments of the present disclosure to any particular configuration or orientation.
  • the optical assembly herein comprises a reflector frame that offers extreme light cut off while also reflecting a greater portion of light in the desired direction to improve light coverage.
  • the extreme light cut off may be characterized by mounting height to back light distance ratio. For example, if the optical assembly is mounted at a height of 20 feet, the back light cutoff will be less than 5 feet rearward of the pole.
  • ratios of back light cutoff to mounting height that are less than 0.5, less than 0.4. less than 0.3, less than 0.25, less than 0.2, less than 0.15, less than 0.1, or less may be achieved.
  • comparing a first cut off line 15 (in Figure 1 ) and another cut off line 25 (in Figure 2 ) shows that the cut off line 25 is much closer to the street than the house side, thereby achieving much sharper cut off using the optical assembly of the present disclosure.
  • an asymmetric lens design is provided that can reduce the reflector size while offering more precise and/or sharp light cutoff.
  • the structure of the lens can take various forms.
  • the lens may include a clear optic that is co-molded into a base (e.g., a black or other colored base), a clear optic that is glued and/or otherwise secured to a base (e.g., a black or other colored base), and/or may include an integrally formed base and optic, with a surface of the base being painted or otherwise colored (e.g., black or another color).
  • the lens and/or base may include a silicone material, as silicone can offer desirable photometric and thermal performance.
  • the lens material it may be desirable for as much of the surface of the base 100 that is exposed to the emitted light (e.g., first surface 100f in Figure 4A ) to incorporate a light absorbing mechanism (e.g., one that absorbs at least 90% of the light that impinges upon it).
  • a light absorbing mechanism e.g., one that absorbs at least 90% of the light that impinges upon it.
  • the exposed surface (e.g., first surface 100f) of the base 100 may be painted a dark color (e.g., black).
  • the portion of the lenses that couple to the base 100 e.g., that flat portion of strips 110 in FIG. 4A
  • Lenses formed of a silicone material cannot be painted.
  • a dark (e.g., black) material e.g., felt, paper, etc.
  • a dark material e.g., felt, paper, etc.
  • the clear portion of the lenses can be co-molded with and/or adhered to a darker material that forms the portion of the lenses that couple to the base 100.
  • the optical assembly comprises one or more light sources, a number of lenses (e.g., made of PMMA or silicone material) placed over the light sources, and one or more reflectors (e.g., made of pure black plastic and vacuum metalized reflective surface) placed proximate the lens.
  • a number of lenses e.g., made of PMMA or silicone material
  • one or more reflectors e.g., made of pure black plastic and vacuum metalized reflective surface
  • the optical assembly 10 includes a base 100, a plurality of lenses (e.g., lenses 111-115 and lenses 121-125) disposed on the base 100 and over a plurality of light sources 150 (e.g., shown in Figure 4C ), and one or more reflectors 201-204 that each have a reflector surface 201c-203c disposed adjacent to one or more of the plurality of light sources 150 and/or the plurality of lenses (e.g., lenses 111-115 and lenses 121-125).
  • Each of reflector surfaces 201c-203c can be a reflective surface configured to reflect light from the LEDs, as such can be alternatively referred as the reflective surfaces 201c-203c.
  • Reflector surface 201c may project over at least a portion of one or more of the light sources 150.
  • the reflector surface 201c-203c may be formed from one or more angled and/or curved sections so as to project upward from the base 100 and over at least of portion of one or more of the light sources 150.
  • the reflector surface 201c may include a single planar surface that is angled relative to the base 100 to extend over at least of portion of one or more of the light sources 150, while in other embodiments the reflector surface 201c may be formed from multiple planar portions that are at different angles relative to one another.
  • all or part of the reflector surface 201c may be curved, and may include a constant or varying degree of curvature.
  • the light sources 150 can be light emitting diodes (LED) 150.
  • the reflector surface 201c in combination with the lenses 111-115 and LEDs 150 allows the light to be directed in a desired direction.
  • the reflector surface 201c is also configured to cutoff light from traveling in undesired directions.
  • the reflectors 201 may be positioned relative to the LEDs 150 and lenses 111-115 such that light emitted from each lens 111-115 in undesired directions may contact one of the surfaces 201c, which then reflects such light in a desired direction and/or otherwise away from the undesired direction.
  • the base 100 can also prevent the light from the LEDs from traveling in other directions than the desired direction.
  • the base 100 may be formed from and/or coated with a black (or other dark color) material.
  • the base 100 may absorb at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or more of light. This may enable the base 100 to absorb light directed toward the base 100 to prevent and/or reduce the amount of light reflected by the base 100, some of which may otherwise be reflected in an undesired direction.
  • the optical assembly 10 can be a luminaire used to light a street.
  • the optical assembly is configured to project light in a desired direction (in this case, a street side), while limiting or preventing the projection of light in an undesired direction (in this case, a house side such as a front yard or a back yard or any other area that should not be illuminated/does not allow light trespass).
  • the components of the optical assembly including the lenses, the LEDs and reflectors are further discussed in detail below.
  • a light source emits light that can be received and further distributed by the lens, as discussed herein.
  • the light source can be or can comprise one or more light emitting diodes, for example.
  • the light source and/or the emitted light can have an associated optical axis.
  • the light source can be deployed in applications where it is desirable to bias illumination laterally relative to the optical axis. For example, as shown in Figures 2 and 7B , in a street luminaire where the optical axis is pointed down towards the ground, it may be beneficial to direct light towards a street side of the optical axis, rather than towards a row of houses that are beside the street (e.g., see Figure 2 ).
  • the light source can be positioned relative to a lens that receives light propagating on one side or both sides of the optical axis and redirects that light toward the reflector and/or sends the light forward toward the street side.
  • the lens can receive light that is headed towards the houses and redirect that light towards the street via the reflector 201.
  • the plurality of lenses 111-115 are disposed on the base 100 and spaced from each other in a row 110. Similarly, another plurality of lenses 121-125 are disposed in another row 120.
  • the lenses 111-115 may be provided as individual components, as sheets containing multiple rows of lenses, as strips 110s containing a single row of lenses, and/or other forms. Providing the lenses in one or more sheets or strips 110s may facilitate coupling multiple lenses to a corresponding array of LEDs and/or to the base 100.
  • the lens strips 110s and 120s are coupled to a first surface 100f (e.g., a front, upper, or exposed surface in Figure 4A ) of the base 100.
  • An inner surface of each lens 111-115 may define a cavity 140 (as shown in Figure 4C ) or other volume that may receive light from a respective one of the LEDs 150.
  • the base 100 can include a plurality of apertures or openings (e.g., 131-135).
  • the openings 131-135 can be accessed from an opposite second surface 100b of the base 100 (e.g., a back, lower, or rear surface in Figure 4B ) of the base 100.
  • the array of LEDs can be disposed through the openings 131-135 from the second surface 100b.
  • an optical assembly or an illumination system can comprise a two-dimensional array of LEDs.
  • the resulting two-dimensional array of LEDs can comprise a light module or light bar, one or more of which can be disposed in a luminaire or other lighting apparatus, for example.
  • the lenses can be formed of optical grade silicone and can be pliable and/or elastic.
  • the lenses can be formed of an optical plastic such as poly-methyl-methacrylate (PMMA), polycarbonate, silicone, or an appropriate acrylic, to mention a few representative material options without limitation.
  • the base 100 may be configured to absorb light and/or redirect light in a desired direction.
  • the base 100 may be colored such that the base 100 has desired reflectance and/or absorption properties.
  • the base 100 may be a colored black, or any dark color that absorbs a high percentage of light (e.g., greater than 90%).
  • the base 100 may include a host material and a colorant in the base material.
  • the colorant may be a pigment, a dye, etc. that colors the host material, thereby adjusting its absorption/reflection properties.
  • the material of the base 100 may be selected to absorb at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or more of light.
  • suitable host materials include PMMA, silicone, and/or other polymeric materials.
  • the base 100 may include a host material having a first surface and a second surface opposite the first surface. The first surface may be an upward facing surface. A colored layer may be disposed on the first surface. The colored layer may be a layer of paint, dye, etc.
  • any light incident on the first surface 100f can be absorbed and not reflected thereby preventing light leakage toward an undesired direction (e.g., the house side).
  • the plurality of lenses 111-115 and 121-125 can be individually coupled to the base 100.
  • the plurality of lenses 111-115 and 121-125 can be glued or co-molded with the base 100.
  • the plurality of lenses 111-115 and 121-125 can be attached to the base 100 by an adhesive.
  • the lenses 111-115 may be snapped, fastened, and/or otherwise mechanically secured with the base 100.
  • the lenses 111-115 can have a dome-shaped outer surface 111o with a central axis perpendicular to a plane of the base 100.
  • the lenses 111 and 121 have central axes 111a and 121a, respectively, as shown in Figure 4C .
  • the central axis 111a or 121a can be an axis passing through a center of the lens 111 or 121.
  • the central axis of a lens lies within a plane (perpendicular to plane 311 in Figure 8A ) (1) that extends through the lens in a direction that is parallel to the house side to street side direction (i.e., the x direction in Figure 8A ) and/or extends perpendicular to the length of the reflector (i.e., the y direction in Figure 8A ) and ( 2 ) that extends through the optical cavity 140.
  • plane perpendicular to plane 311 in Figure 8A
  • the central axis of the lens extends along the height of the lens (i.e., along the z direction) and bisects the midpoint of the linear distance between the end points 901, 904 of the outer surface 111o (i.e., where the outer surface intersects the plane of the base 100).
  • the LED 150 of the plurality of LEDs is disposed in a cavity 140 of lens 111 of the plurality of the lens 111-115 such that the central or optical axis 150a of the LED is offset from the central axis 111a of the lens 111 in a direction toward the reflector surface 201c of the reflector 201.
  • the plurality of lenses 111-115 have a corresponding plurality of LEDs 150 disposed therein such that the central axes of the lenses are offset toward and/or close to the reflector 201.
  • each of the plurality of light emitting diodes (LED) 150 are placed in a corresponding lens of the plurality of lenses 111-115.
  • the LED 150 has an optical axis 150a perpendicular to a plane of the LED or perpendicular to the base 100.
  • the optical axis 150a of an LED 150 is offset from the central axis 11 1a of an outer surface of the lens 111 of the plurality of lenses 111-115.
  • each LED 150 may be provided on a printed circuit board (PCB) 160 and/or other substrate.
  • the PCB 160 can be attached to the second surface 100b of the base 100 such that the LEDs reside within and/or emits light into the cavities 140 of the lenses.
  • the PCB 160 and/or other substrate may be configured to absorb at least 90% of light incident thereon, such as by including a light-absorbing material (e.g., a material containing a pigment that absorbs at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or more of light).
  • a light-absorbing material e.g., a material containing a pigment that absorbs at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or more of light.
  • Figures 7A and 8A illustrate a cross-section view showing structure of an exemplary lens 111, according to one embodiment.
  • the lens 111 has a dome shape with an inner surface 111i facing the LED 150 and an outer surface 111o facing away from the LED 150, opposite the inner surface 111i.
  • the inner surface 111i can include a refractive surface that receives light headed away from the optical axis of the LED 150, for example away from the street to be lighted.
  • the inner surface 111i can be a concave lens surface facing toward the LED 150, with the inner surface 111i being spaced apart from an outer surface of the LED 150.
  • the inner surface 111i can receive the incident light from the LED 150 and create a refracted beam that exits the lens 111 through the outer surface 111o, which causes the beam to diverge.
  • the outer surface 111o can be a convex lens surface, for example.
  • the inner surface 111i may have a shape that differs from a shape of the outer surface 111o.
  • the inner surface 111i may have a concave shape that is different from the convex shape of the outer surface 111o.
  • the concave shape of the inner surface 111i is offset from the outer surface 111o.
  • each lens 111-115 can comprise a cavity 140 (see Figure 4C and 7A ) that has a concave shape.
  • the walls of the lens may be asymmetric in some embodiments.
  • a rear wall e.g., closest to the reflector 201
  • a front wall e.g., further from the reflector 201
  • the cavity 140 can be filled with air between the inner surface 111i and the LED 150.
  • the cavity 140 receives light from the LED 150.
  • the lens 111 comprises a receptacle in which the LED 150 can be seated or is otherwise disposed.
  • the receptacle can be irregularly shaped to receive a circuit board to which one or more light emitting diodes is mounted, for example.
  • a lens e.g., lens 111 is symmetric in a reference plane 311 extending through the optical axis 150a of the LED 150 along they direction (in FIG. 8A ) and when viewed in the x direction (in FIG. 8A ). Additionally, referring to Figures 8A and 8C , the lens is asymmetric about the reference plane 311 when viewed in the y direction (in FIG. 8A ) in that the central axis 111a of the lens is offset from the reference plane 311. As shown in Figure 8C , the reference plane 311 separates the lens into a street-side portion and a house-side portion.
  • the street-side portion is larger in size than the house-side portion in order to reduce the size of the optical system while providing better cut-off.
  • the street-side portion controls a main beam emitted from the LED 150 and directs the beam toward a desired direction (e.g., between 55°-75° relative to nadir).
  • the house-side portion acts as the light transmission layer which sends the light to the reflector 201.
  • Such lens construction advantageously sends more light towards a desired direction through the lens.
  • a reduced size of a lens portion e.g., the house-side lens portion
  • the optical axis 150a of the LED 150 may be positioned closer to the reflector 201, which may enable a height of the reflector 201 to be reduced while still providing a desired cutoff angle for light.
  • each reflector 201 may protrude from the base 100 at a first end 905 (proximate the base) and terminate at a second end 903 and may have a reflective surface 201c that extends between the first end 905 and the second end 903 (see FIGS. 9A, 9B ).
  • each reflector 201 may include a first side that includes the reflective surface 201c (e.g., street side) and an opposite second side 201b (e.g., a house-side or a side behind the reflective surface 201c).
  • the reflector 201 is an elongated member having a reflective material or coating on the reflective surface 201c, while the second side may be painted black (or other dark color) to prevent light from a different row of LEDs from reflecting toward the house side.
  • Each reflector 201 is disposed adjacent to the plurality of lenses 111-115 having corresponding plurality of LEDs 150 therein such that the plurality of LEDs 150 or lenses 111-115 are at the first side (e.g., street side).
  • the reflective surface 201c extends in a direction perpendicular to the plane of the base 100, however in other embodiments the reflective surface 201c may extend from the base 100 at other angles.
  • the reflective surface 201c curves over the plurality of LEDs 150 located in the corresponding plurality of lenses 111-115.
  • the reflective surface 201c i.e., the second end 903 further extends beyond the optical axis 150a of the LED 150. Accordingly, the reflective surface 201c is configured to direct light emitted by the plurality of LEDs 150 toward the first side (e.g., the street side) and prevent the light from leaking toward the second side (e.g., the house side) of the reflector 201.
  • the optical assembly 10 can include a plurality of reflectors 201, 202, 203 and 204 and corresponding rows of lenses and LEDs.
  • each reflector 201-204 has the same construction and is positioned in a similar manner with respect to the corresponding plurality of LEDs.
  • the reflector 202 is positioned adjacent to the second plurality of lenses 121-125 covering a corresponding plurality of LEDs 150 such that the reflective surface 202c extends over and beyond a central axis of the LEDs 150. While shown with a single reflector extending along a length of each row of LEDs 150, it will be appreciated that in some embodiments multiple reflectors may be provided for each row of LEDs 150.
  • each LED 150 and lens pair may include a dedicated reflector.
  • the plurality of lenses, the plurality of LEDs, and reflectors are disposed in a number of rows.
  • the first plurality of lenses 111-115 are arranged in a first row and a first plurality of LEDs (e.g., see 111 in Figure 4C ) disposed in corresponding lens of the first plurality of lenses 111-115.
  • the first reflector 201 is disposed adjacent to the first plurality of lenses 111-115 such that the reflective surface 201c of the first reflector 201 extends over the first plurality of lenses 111-115.
  • the second plurality of lenses 121-125 are arranged in a second row spaced from the first row and a second plurality of LEDs (e.g., see LED 150 in lens 121 in Figure 4C ) disposed in the corresponding second plurality of lenses 121-125.
  • the second reflector 202 is disposed between the first plurality of lenses 111-115 and the second plurality of lenses 121-125 such that a reflective surface 202c of the second reflector 202 extends over the second plurality of lenses 121-125.
  • the second plurality of LEDs in the lenses 121-125 are located at the first side of reflector 202 (e.g., street side), and the first plurality of lenses 111-115 are located at the second side of reflector 202 (e.g., house side).
  • the second side of the reflectors 201-204 can be coated or formed from a black (or other dark color) material to absorb light emitted by LEDs on the second side or partially reflective to reflect light emitted by LEDs on the second side without interfering with the light emitted by LEDs on the first side.
  • the LEDs 150 and lenses 111-115, 121-125 may be arranged in two parallel rows, it will be appreciated that other arrangements are possible in embodiments.
  • the LEDs and lenses may be arranged in any number of rows, columns, and/or other patterns.
  • the LEDs and lenses may be arranged at regular and/or irregular intervals in one or more directions. Additionally, a total number of LEDs and lenses and/or a number of LEDs and lenses in a given row, column, or other array may vary across embodiments to meet the needs of a particular lighting application.
  • the reflector 201 (and 202-204) can include side reflectors between each lens to redirect and reflect the light traveling in a direction that is aligned with or substantially aligned with a length of reflector 201 in a desired direction (e.g., street side) thereby improving the illumination profile at the street side.
  • the side reflectors may also prevent light interference between adjacent LEDs thereby improving efficiency of light utilization.
  • the reflector 201 includes side reflectors 211, 212, 213 and 214 projecting from the reflective surface 201c toward the first side (e.g., street side).
  • the side reflectors 211-214 may be curved or transition from the surface of the reflector 201.
  • the side reflectors 211-214 may be angled (e.g., up to 5°) with respect to a perpendicular to the base 100.
  • the side reflector 211 has a reflecting surface 211r facing the LED in the lens 111.
  • the side reflector 212 located between the lenses 111 and 112 has two reflecting surfaces 212r, one surface 212r faces the lens 111 and another surface 212r faces the lens 112.
  • each of the side reflectors 213 and 214 has reflecting surfaces 213r and 214r facing the lenses between which each is interposed.
  • the optical assembly 10 can be configured to direct light from each row of LEDs via a corresponding reflector toward the street without light interference between LEDs or light interference between adjacent rows of LEDs.
  • light emitted from each LED or rows of LEDs can be better directed to a desired direction (e.g., street side) to improve light utilization, while cutting off or otherwise preventing light emitted by the optical assembly 10 from being directed toward undesired directions (e.g., house side).
  • the reflective surface 201c of the reflector 201 can have a partially concave shape.
  • the present disclosure is not limited to a concave shape.
  • different linear and/or curved surfaces can be created to direct light in a desired direction.
  • the reflective surface 201c of the reflector 201 can have a parabolic shape extending from the base 100 toward and beyond the central axis of the plurality of LEDs.
  • the reflective surface 201c of the reflector 201 can have a free form shape characterized by multiple curvatures between end points of the reflective surface 201c, with a first end point being at the junction of the reflective surface 201c and the base 100 and a second end point being a distal end of the reflective surface 201c that extends over the plurality of lenses 111-115.
  • the free form shape comprises a first curvature between the first end point at the base 100 and an intermediate point between the first end point and the second end point; and a second curvature between the intermediate point and the second end point of the curved surface.
  • the free form may be generally characterized by the curved portion elongating in a direction of the selected area (e.g., a street-side direction).
  • the reflector 201 has a reflective surface 201c with a linear segment or base extending approximately perpendicularly from the base 100 up to a height corresponding to a top of the outer surface 111o of the lens 111. Extending from the linear segment, the reflective surface 201c can extend further with a curve toward the central axis of the LED.
  • the curve can be characterized by a plurality of points connected by curved line segments.
  • the series of curved segments each comprise a reflective surface and a curvature having a profile of an arc segment of an ellipse, a parabolic curvature, a hyperbolic curve, or other second or higher degree curve portions.
  • the reflective surface 201c of the reflector 201 can be characterized by a first angle ⁇ , a second angle ⁇ , or both.
  • the first angle ⁇ is formed between the base 100 and a line 902 that extends between a distal end 901 (e.g., street side) of the lens 111 furthest from the reflective surface 201c and a distal end 903 of the reflective surface 201c located over the lens 111.
  • the second angle ⁇ is formed between the base 100 and a line 912 that extends from a position 911 on the outer surface 111o of the lens 111 that is aligned with the optical axis 150a of the LED 150 and the distal end 903 of the reflective surface 201c located over the lens 111.
  • the first angle ⁇ can be in a range between 60° and 90° (e.g., between 60°-70°, 70°-80°, 80°-90° or other narrow ranges). In some embodiments, greater angles may further enable the height of the reflector to be decreased and/or may provide sharper backlight cutoff.
  • the second angle ⁇ can be in a range between 70° and 130°.
  • the reflector 201 that satisfies the first angle ⁇ , the second angle ⁇ , or both facilitates a compact design, while providing a desired cutoff of the backlight (e.g., light directed toward the house side).
  • the reflective surface 201c of the reflector that satisfies the first angle and the second angle conditions facilitates reducing a height of the reflector 201 required to cut toff the backlight and also allows positioning of the LEDs 150 proximate to the reflective surface 201c so that the light from the LEDs can be directed in a desired direction (e.g., street side).
  • the first angle ⁇ and the second angle ⁇ bring the distal end 903 of the reflective surface 201c closer to the LEDs while facilitating cutoff of the backlight (e.g., light directed toward the house side).
  • the reflective surface 201c of the reflector 201 facilitates compact design compared to a straight edge reflector 250 (see Figure 9C ).
  • the reflective surface 201c extends over the optical axis 150a of the LED 150 which allows the beam emitting from the LED and transmitted by the lens 111 to be cutoff close to the lens 111 before the beam can spread.
  • the height of the reflective surface 201c can be H1.
  • a height H2 of the straight edge reflector 250 from the base 100 is needed to intercept a beam 922 transmitted at the distal end 901 of the lens 111. Comparing Figures 9A and 9C shows that the beam 922 in FIG.
  • the height H1 of the reflector 201 can be substantially smaller than the height H2 of the straight edge reflector 250 while still providing the desired backlight cutoff ability.
  • the H1/H2 ratio may be between 1/3 to 1/2.
  • a reflector can have an angular shape to light a corner space.
  • a reflector 400 can be angular in shape comprising a first surface portion 401, a second surface portion 403 disposed at an angle with the first surface portion 401, and a corner surface portion 402 connecting the first surface portion 401 and the second surface portion 401.
  • the first surface portion 401 and the second surface portion 403 have surfaces 401c and 403c, respectively.
  • the surfaces 401c and 403c can have similar structure as the reflective surface 201c of the reflector 201 discussed herein.
  • the corner surface portion 402 also has a surface 402c to direct the light emitted towards a corner back to a desired direction (e.g., street side).
  • the surface portion 402 curves along multiple axes to connect the first surface portion 401 and the second surface portion 403.
  • the surface 402c of the surface portion 402 also curves along multiple axes (e.g., x and y axis in the plane defined by the base 100) connecting the surfaces 401c and 403c and also further curves along another axis (e.g., z axis perpendicular to the base 100) and extends over the lens to at least partially cover the lens.
  • Figure 11 illustrates an exemplary corner optical assembly 40 comprising a plurality of corner reflectors such as reflectors 400 and 410.
  • an LED 150 is located in each of the lenses 111 and 112, respectively.
  • the surfaces 401c, 402c and 403c of the reflector 400 face the LED 150 in the lens 111.
  • the surfaces 411c, 412c and 413c of the reflector 410 face the LED 150 in the lens 112.
  • the optical assembly 40 includes additional similar corner reflectors, and lenses, although not numbered. As discussed herein, the reflectors 400 and 410, and lenses 111 and 112 of the optical assembly 40 can be installed on the base 100.
  • the base 100 along with the reflectors, lens, and LEDs can be further supported by a frame 450.
  • the frame 450 can provide a support structure for the base and reflectors.
  • the frame 450 can be further adapted to be installed in a casing of a luminaire.
  • Figure 12 illustrates an example luminaire 20 implementing an optical assembly 10.
  • the optical assembly 10 can be installed in a casing 50 coupled to a pole 60.
  • the pole 60 can be installed at the housing side and the casing 50 can extend toward the street or a corner desired to be illuminated.
  • the optical assembly 40 may be incorporated into a luminaire, e.g., by replacing the optical assembly 10 of the luminaire 20 with the optical assembly 40.
  • the optical assembly can be used to illuminate a selected area (e.g., a street) while cutting off and/or otherwise preventing leakage of the light away from the selected area (e.g., towards a house).
  • the reflector can be curved as discussed herein.
  • the optical assembly can be oriented downwardly towards ground such that the optical axes 150a of the LEDs 150 are oriented in a general downward direction (e.g., see Figures 2 and 7B ), and the curved surface of the reflector directs the light toward a selected area (e.g., the street, a pathway, or other indoor or outdoor areas).
  • the reflector can be configured as a corner reflector (e.g., see Figures 10-11 ) to direct light to a particular corner.
  • the optical assembly can include a combination of curved reflectors (e.g., reflector 201) and corner reflectors (e.g., 400).
  • the optical axis 150a of the LEDs 150 can be oriented upward and reflectors can be positioned to direct light to a particular wall, porch, or an object of interest for decorative purposes. It can be understood that the present application uses a selected area as a street to illustrate the concepts.
  • the optical assembly may be configured to direct light to any selected area or region that is indoor (e.g., a wall inside a house) or outdoor (e.g., a street, a walkway, a porch, etc.).
  • Figure 13 illustrates an optical assembly 500, according to another embodiment.
  • the optical assembly 500 may be similar to optical assembly 10 and may include any of the features described in relation to optical assembly 10.
  • Optical assembly 500 may include a base 502, a plurality of lenses 504 disposed on or coupled with the base 502 so as to extend from and/or above the exposed surface of the base, a plurality of light sources (not shown) disposed in or behind the plurality of lenses 504, and one or more reflectors 506 that each have a reflective surface 508 (which may be similar to the reflective surface 201) disposed adjacent to one or more of the plurality of light sources and/or the plurality of lenses 504.
  • the lenses 504 and/or light sources may be arranged in one or more rows that are spaced apart from one another.
  • Each row of lenses 504 and/or light sources may include one or more of the reflectors 506, with the reflective surface 508 of each reflector 506 extending from the base 502 and extending over at least a portion of one or more of the lenses 504 and/or light sources such as described previously with respect to reflectors 201.
  • Figures 14 and 15 illustrate top and bottom perspective views of the base 502 and lenses 504.
  • the base 502 may be configured to prevent the light from the LEDs from traveling in other directions than the desired direction.
  • the base 502 may be configured to absorb at least 90%, or greater of light incident thereon.
  • the base 502 may be formed from and/or coated with a light-absorbing material, such as a material that contains a dark pigment that absorbs substantially all light (e.g., absorbs at least 90). This may enable the base 502 to absorb light directed toward the base 502 to prevent and/or reduce the amount of light reflected by the base 502, some of which may otherwise be reflected in an undesired direction.
  • the base 502 may define a number of apertures 510, with each of the apertures 510 receiving a respective one of the lenses 504 and/or light sources.
  • each lens 504 may include a dome that extends from a backside of the base 502 and extends at least partially through a respective one of the apertures 510. As described in relation to lenses 111-115, the dome may be asymmetric along at least one axis that is parallel to the base 502.
  • each lens 504 may have an elliptical shape having a major axis and a minor axis that extend in a direction parallel to the base 502.
  • each lens 504 may protrude away from the base 502 and may be asymmetric along the major axis (or other axis that extends through the lens 504 and the corresponding reflector 506).
  • a slope of the dome may be greater on a reflector-side of the dome than on an opposite surface along the major axis.
  • the light sources may be disposed closer to the reflector-side of the dome in some embodiments, which may enable the corresponding reflector 506 to be positioned closer to the light source to provide a sharper light cut off angle.
  • the light sources may include a number of LEDs that are provided on a printed circuit board and/or other substrate.
  • the lenses 504 may be inserted through the apertures 510 of the base 502 from a rear side of the base 502 such that the lenses 504 are sandwiched between the printed circuit board and the base 502.
  • a surface area of the base 502 that is exposed on the optical assembly 500 may be increased.
  • the base 502 is configured to absorb substantially all light incident thereon, the increased surface area may enable greater levels of light directed toward the base 502 to be absorbed, and may thereby help prevent light from being directed in an undesired direction.
  • Such embodiments may enable the optical assembly 500 to direct at least or about 95%, at least or about 96%, at least or about 97%, at least or about 98%, at least or about 99%, at least or about 99.5%, at least or about 99.7%, or more of the light in a desired direction (e.g., a street side), with less than about 5%, less than about 4%, less than about 3%, less than about 2%, less than about 1%, less than about 0.5%, less than 0.3%, or less of the light being directed toward an undesired (e.g., opposite) direction (e.g., a house side).
  • a desired direction e.g., a street side
  • a cut off plane of the light may be in vertical alignment with a rearmost (e.g., closest to the undesired direction) light source and/or reflector of the optical assembly.
  • the light cutoff plane (1) may extend through the optical axis of one or more of the plurality of LEDs located within the optical assembly at a location most distal from the desired direction and (2) may extend parallel to the optical axis of those one or more LEDs and perpendicular to the desired direction.
  • the base 502 may include a front surface 512 and a rear surface 514 that is opposite the front surface 512.
  • the reflectors 506 may be disposed on the front surface 512.
  • the rear surface 514 may define one or more recesses 516 that may receive the lenses 504.
  • the lenses 504 may be provided as one or more strips and/or sheets of optical material that may each include one or more rows of lenses 504. The strips of material may be inserted within the recesses 516 to seat the lenses 504 within the apertures 510 defined within the base 502.
  • a thickness of the strips of material may be substantially the same as a depth of the recesses 516 such that a rear surface of each strip of material is substantially flush with the rear surface 514 of the base 502.
  • the base 502 defines two recesses 516 that are parallel to one another. A strip of material containing a first row of lenses 504 is inserted within a first of the recesses 516 and a second strip of material containing a second row of lenses 504 is inserted within a second of the recesses 516. It will be appreciated that other arrangements are possible in various embodiments.
  • each lens 504 may be a separate component, each sheet and/or strip of material may include multiple rows of lenses 504, the lenses 504 may be arranged in non-row arrays, and/or other variations are possible. Additionally, some embodiments may include multiple bases positioned side-by-side with one another.
  • the rear surface 514 of the base 502 may include one or more adhesive channels 520 for receiving adhesive to attach the lenses and/or PCB (e.g., 160 in FIG. 4C ) to the rear surface 514 of the base 502.
  • the adhesive channels 520 can contain the adhesive within the channels so that the adhesive cannot enter apertures/openings (e.g., openings 131-135 in FIG. 4B ) in the base 502 so as to detrimentally impact operation of the lenses 504 and/or LEDs.
  • the adhesive channels 520 can extend along any length of the rear surface 514.
  • the adhesive channels 520 can also extend along a width of the rear surface 514 towards the apertures through which the lenses 504 can be disposed.
  • a cutoff plane 602 is a vertical plane that crosses the optical center of the fixture (e.g., the plane that separates the street side and house side). The area that is illustrated as being above the cutoff plane 602 is a desired direction (e.g., the "street-side" or the forward direction with regard to the fixture head and the pole, counting from the optical center per IES LM-63).
  • the area that is illustrated as being lower than the cutoff plane 602 is an undesired direction (e.g., the "house-side” or the backward direction with regard to the fixture head and the pole, counting from the optical center per IES LM-63-02 and LM-63-19).
  • the fixture with optical assembly 500 produced the lighting application layout 600a as shown in Figure 16 .
  • the optical assembly 500 directed 99.7% of emitted light toward a desired direction (e.g., a street side) relative to cutoff plane 602, while only 0.3% of the emitted light was directed toward an undesired direction (e.g., a house side) and achieved a B0 backlight rating up to 65,000 lumen pursuant to the IES LM-79 goniophotometer test result.
  • Lighting application layouts 600b-600f illustrate the performance of several competitor fixtures at the same lumen output and same application layout condition.
  • the lighting fixture with optical assembly 500 produced better backlight control than each of the tested competitor optical assemblies, the best of which directed 2% of emitted light in the undesired direction.
  • the lighting fixture with optical assembly 500 also produced better illuminance uniformity and coverage area compared to the competitor light fixtures.
  • the optical assembly provided more uniform rectangular illuminance pattern on the target area that extended along both length (e.g., orthogonal to plane 602) and width (e.g., along the 602) axes.
  • lighting fixture with optical assembly 500 delivered 1 foot-candle ("fc") of light to an area approximately 50 feet wide and 60 feet long, 0.5 fc of light to an area approximately 60 feet wide and 68 feet long, and 0.1 fc of light to an area approximately 95 feet wide and 95 feet long.
  • fc 1 foot-candle
  • multiple fixtures including optical assemblies 500 may provide better coverage (and better backlight control) than the competitor optical assemblies, as illustrated in Figure 17 .
  • the light coverage achieved by the fixtures with optical assemblies 500 is shown in lighting application layout 700a, while the competitor fixture coverage is illustrated in lighting application layouts 700b-700f.
  • the fixtures for testing were spaced apart by 146 feet laterally (e.g., along the cutoff plane 602) and 151 feet lengthwise (e.g., for fixtures on opposite sides of the area).
  • Lighting application layout 800a illustrates the corner control provided by the fixture including the corner optical assembly of the present invention
  • lighting application layouts 800b-800d illustrate the performance of the competitor optical assemblies.
  • Examples providing additional description of a variety of example types in accordance with the concepts described herein are provided below. These examples are not meant to be mutually exclusive, exhaustive, or restrictive; and the present disclosure is not limited to these example examples but rather encompasses all possible modifications and variations within the scope of the issued claims and their equivalents.
  • Example 1 An optical assembly comprising: a base; a plurality of lenses disposed on the base and spaced from each other in a row, each lens having a dome shape having a central axis perpendicular to a plane of the base; a plurality of light emitting diodes (LED), each LED being disposed between the base and a respective lens of the plurality of lenses, each LED having a central axis perpendicular to a plane of the LED, the central axis of an LED being offset from the central axis of the respective lens of the plurality of lenses; and at least one reflector having a curved surface the at least one reflector being disposed adjacent to at least one of the plurality of LEDs such that the at least one of the plurality of LEDs are at a first side of the at least one reflector, the curved surface extending from the base and curving over the at least one of the plurality of LEDs and beyond the central axis of each of the at least one of the plurality of LEDs, the curved surface being configured
  • Example 2 The optical assembly of any of the preceding or subsequent examples or combination of examples, wherein each lens of the plurality of lenses defines a cavity, and each LED of the plurality of LEDs is disposed in a respective one of the cavities such that the central axis of the LED is offset relative to a central axis of the respective lens in a direction of the curved surface of the at least one reflector.
  • Example 3 The optical assembly of any of the preceding or subsequent examples or combination of examples, wherein the curved surface of the reflector has a concave shape.
  • Example 4 The optical assembly of any of the preceding or subsequent examples or combination of examples, wherein the curved surface of the reflector has a parabolic shape extending from the base toward and beyond the central axis of the plurality of LEDs.
  • Example 5 The optical assembly of any of the preceding or subsequent examples or combination of examples, wherein the curved surface of the reflector has a free form shape characterized by multiple curvatures between end points of the curved surface, a first end point being at the base and a second end point being positioned above at least some of the plurality of lenses.
  • Example 6 The optical assembly of any of the preceding or subsequent examples or combination of examples, wherein the free form shape comprises: a first curvature between the first end point at the base and an intermediate point between the first end point and the second end point; and a second curvature between the intermediate point and the second end point of the curved surface.
  • Example 7 The optical assembly of any of the preceding or subsequent examples or combination of examples, wherein the reflector is an elongated member having a reflective coating on the curved surface.
  • Example 8 The optical assembly of any of the preceding or subsequent examples or combination of examples, wherein the curved surface of the reflector is characterized by at least one of: a first angle between a first line and a plane of the base, the first line joining a distal end of a lens furthest from the curved surface and a distal end of the curved surface located over the lens, and a second angle between a second line and the plane of the base, the second line joining a point on the lens located at the central axis of the LED and the distal end of the curved surface located over the lens.
  • Example 9 The optical assembly of any of the preceding or subsequent examples or combination of examples, wherein the first angle is in a range between 60° and 90°.
  • Example 10 The optical assembly of any of the preceding or subsequent examples or combination of examples, wherein the second angle is in a range between 70° and 130°.
  • Example 11 The optical assembly of any of the preceding or subsequent examples or combination of examples, wherein the base comprises light absorbing material or coating.
  • Example 12 The optical assembly of any of the preceding or subsequent examples or combination of examples, wherein the plurality of lenses are attached to the base by an adhesive.
  • Example 13 The optical assembly of any of the preceding or subsequent examples or combination of examples, wherein the plurality of lenses are attached to the base by an adhesive.
  • the plurality of lenses comprises: a first plurality of lenses arranged in a first row; and a second plurality of lenses arranged in a second row; and the plurality of LEDs comprises: a first plurality of LEDs disposed in the first plurality of lenses; and a second plurality of LEDs disposed in the second plurality of lenses.
  • Example 14 The optical assembly of any of the preceding or subsequent examples or combination of examples, wherein the at least one reflector comprises: a first reflector disposed proximate to the first plurality of lenses on an opposite side of the second plurality of lenses such that a curved surface of the first reflector extends over the first plurality of lenses; and a second reflector disposed between the first plurality of lenses and the second plurality of lenses such that a curved surface of the second reflector extends over the second plurality of lenses.
  • Example 15 The optical assembly of any of the preceding or subsequent examples or combination of examples, wherein the at least one reflector extends along a single lens of the plurality of lenses.
  • Example 16 The optical assembly of any of the preceding or subsequent examples or combination of examples, wherein the at least one reflector has an angular shape comprising a first curved surface portion, a second curved surface portion disposed at an angle with the first curved surface portion, and a corner portion between the first curved surface portion and the second curved surface portion, the corner portion having a curved surface extending along multiple axes.
  • Example 17 The optical assembly of any of the preceding or subsequent examples or combination of examples, wherein the curved surface of the corner portion of the at least one reflector curves between the first curved surface portion and the second curved surface portion, and also curves in a plane perpendicular to the base.
  • Example 18 The optical assembly of any of the preceding or subsequent examples or combination of examples, wherein a lens of the plurality of lenses is located at the corner such that the curved surface of the corner portion curves at least partially over the lens.
  • Example 19 An luminaire configured to illuminate a selected area, the luminaire comprising: a base; a plurality of lenses disposed on the base and spaced from each other in a row, each lens having a dome shape having a central axis perpendicular to a plane of the base; a plurality of light emitting diodes (LED) disposed between the base and a respective lens of the plurality of lenses, each LED having a central axis perpendicular to a plane of the LED, the central axis of an LED being offset from the central axis of a respective lens of the plurality of lenses; at least one reflector having a curved surface, the at least one reflector being disposed proximate to at least one of the plurality of LEDs such that the at least one of the plurality of LEDs are at a first side of the at least one reflector, the curved surface extending from a surface of the base and curving over the at least one of the plurality of LEDs and beyond the central axis of each of the at
  • Example 20 The luminaire of any of the preceding or subsequent examples or combination of examples, wherein the curved surface of the reflector has at least one of: a concave shape; a parabolic shape extending from the base toward and beyond the central axis of the plurality of LEDs; or a free form shape characterized by multiple curvatures between end points of the curved surface, a first end point being at the base and a second end point being positioned above at least some of the plurality of lenses.
  • Example 21 An optical assembly comprising: a base comprising a first surface, a second surface opposite the first surface, and a plurality of apertures extending through the base from the first surface to the second surface; a plurality of lenses coupled to the base, each of the lenses having a lens central axis perpendicular to a plane of the base, wherein each lens is attached to the second surface of the base and extends at least partially through a respective one of the plurality of apertures so as to be at least partially exposed on the first surface of the base; a plurality of light emitting diodes (LEDs), each of the LEDs positioned to emit light into a respective one of the plurality of lenses, each of the LEDs having an optical axis; and at least one reflector disposed adjacent to at least one of the LEDs such that the at least one of the LEDs is at a first side of the at least one reflector, wherein: the at least one reflector comprises a first end proximate the base, a second end opposite the first end, and a
  • Example 22 The optical assembly of any of the preceding or subsequent examples or combination of examples, wherein: each of the lenses defines a cavity, and each of the LEDs seats within a respective one of the cavities.
  • Example 23 The optical assembly of any of the preceding or subsequent examples or combination of examples, wherein: the reflective surface of the at least one reflector has at least one of a concave shape or a parabolic shape.
  • Example 24 The optical assembly of any of the preceding or subsequent examples or combination of examples, wherein: each of the LEDs is aligned with a respective one of the plurality of apertures.
  • Example 25 The optical assembly of any of the preceding or subsequent examples or combination of examples, wherein: the first surface of the base is configured to absorb at least 90% of emitted light incident on the first surface.
  • Example 26 The optical assembly of any of the preceding or subsequent examples or combination of examples, wherein the first surface of the base comprises a light absorbing material or coating.
  • Example 27 The optical assembly of any of the preceding or subsequent examples or combination of examples, wherein the reflector comprises a light absorbing material or coating on a side of the reflector opposite the reflective surface.
  • Example 28 The optical assembly of any of the preceding or subsequent examples or combination of examples, wherein the reflective surface is a curved surface characterized by at least one of: a first angle between a first line and a plane of the base, the first line joining a distal end of a lens furthest laterally from the first end of the reflector and the second end of the reflector located over the lens; and a second angle between a second line and the plane of the base, the second line joining a point on the lens located at the optical axis of the LED and the second end of the reflector located over the lens.
  • Example 29 The optical assembly of any of the preceding or subsequent examples or combination of examples, wherein the first angle is in a range between 60° and 90°.
  • Example 30 The optical assembly of any of the preceding or subsequent examples or combination of examples, wherein the second angle is in a range between 70° and 130°.
  • Example 31 The optical assembly of any of the preceding or subsequent examples or combination of examples, wherein: the reflective surface comprises one or more linear segments.
  • Example 32 The optical assembly of any of the preceding or subsequent examples or combination of examples, wherein the plurality of lenses is coupled to the base with adhesive, and wherein the second surface of the base defines channels for the adhesive.
  • Example 33 The optical assembly of any of the preceding or subsequent examples or combination of examples, wherein: each of the lenses comprises a dome that extends through the respective one of the plurality of apertures; and the dome is asymmetric along at least one axis that is parallel to the base.
  • Example 34 The optical assembly of any of the preceding or subsequent examples or combination of examples, wherein the second surface of the base defines at least one recess and wherein the plurality of lenses are seated within the at least one recess.
  • Example 35 The optical assembly of any of the preceding or subsequent examples or combination of examples, wherein: the at least one recess comprises a first recess and a second recess that extend parallel to each other; the plurality of lenses comprise a first row of lenses and a second row of lenses; the first row of lenses is disposed within the first recess; and the second row of lenses is disposed within the second recess.
  • Example 36 The optical assembly of any of the preceding or subsequent examples or combination of examples, wherein: the plurality of LEDs are provided on a substrate; and the plurality of lenses are sandwiched between the substrate and the base.
  • Example 37 The optical assembly of any of the preceding or subsequent examples or combination of examples, wherein: each of the lenses comprises a first side most proximate the at least one reflector and a second side opposite the first side; and each of the LEDs is disposed closer to the first side than the second side of a respective one of the plurality of lenses.
  • Example 38 An optical assembly comprising: a plurality of lenses, each of the lenses having a lens central axis; a plurality of light emitting diodes (LEDs), each of the LEDs oriented to emit light into a respective one of the plurality of lenses, each of the LEDs having an optical axis; and at least one reflector disposed adjacent to at least one of the LEDs such that the at least one of the LEDs is at a first side of the at least one reflector, wherein: the at least one reflector has a reflective surface extending over the at least one of the LEDs and beyond the optical axis; and the optical axis of the at least one of the LEDs is laterally offset from the lens central axis of the respective one of the lenses in a direction toward the at least one reflector so as to be located more proximate the at least one reflector than the lens central axis, wherein the LEDs are configured to emit light from the optical assembly and wherein the optical assembly is configured to direct at least 95% of the emitted light in
  • Example 39 The optical assembly of any of the preceding or subsequent examples or combination of examples, further comprising: a base defining a plurality of apertures, wherein each of the lenses extends through a respective one of the plurality of apertures so as to be visible on a first surface of the base.
  • Example 40 The optical assembly of any of the preceding or subsequent examples or combination of examples, wherein: the plurality of LEDs are provided on a substrate; and the substrate is configured to absorb at least 90% of light incident on the substrate.
  • Example 41 The optical assembly of any of the preceding or subsequent examples or combination of examples, wherein: the reflective surface comprises a curved surface.
  • Example 42 The optical assembly of any of the preceding or subsequent examples or combination of examples, further comprising: a base, wherein the at least one reflector is coupled with the base.
  • Example 43 The optical assembly of any of the preceding or subsequent examples or combination of examples, wherein: the plurality of lenses are arranged in a plurality of rows; the at least one reflector comprises a plurality of reflectors; and at least one of the plurality of reflectors extends between adjacent rows of the plurality of rows of lenses.
  • Example 44 An optical assembly comprising: a plurality of lenses, each of the lenses having a dome shape portion and a lens central axis; a plurality of light emitting diodes (LEDs), each of the LEDs oriented to emit light into a respective one of the plurality of lenses and each of the LEDs having an optical axis; and at least one reflector disposed adjacent to at least one of the LEDs such that the at least one of the LEDs is at a first side of the at least one reflector, wherein the at least one reflector has a reflective surface extending over the at least one of the LEDs and beyond the optical axis of the at least one of the LEDs and wherein the optical axis of the at least one of the LEDs is laterally offset from the lens central axis of the respective one of the lenses in a direction toward the at least one reflector so as to be located more proximate the at least one reflector than the lens central axis, wherein the optical assembly comprises a surface from which the dome shape portions of the plurality of
  • Example 45 The optical assembly of any of the preceding or subsequent examples or combination of examples, wherein surface comprises a light absorbing material or coating.
  • Example 46 The optical assembly of any of the preceding or subsequent examples or combination of examples, wherein: the plurality of LEDs are provided on a substrate comprising the surface.
  • Example 47 The optical assembly of any of the preceding or subsequent examples or combination of examples, wherein: the plurality of lenses are coupled to a base and the base comprises the surface.
  • Example 48 A luminaire configured to illuminate a selected area, the luminaire comprising: an optical assembly comprising: a base comprising a first surface, a second surface opposite the first surface, and a plurality of apertures extending through the base from the first surface to the second surface; a plurality of lenses coupled to the base, each of the lenses having a lens central axis perpendicular to a plane of the base, wherein each lens is attached to the second surface of the base and extends at least partially through a respective one of the plurality of apertures so as to be at least partially exposed on the first surface of the base; a plurality of light emitting diodes (LEDs), each of the LEDs positioned to emit light into a respective one of the plurality of lenses, each of the LEDs having an optical axis; and at least one reflector disposed adjacent to at least one of the LEDs such that the at least one of the LEDs is at a first side of the at least one reflector, wherein: the at least one reflector comprises a first end prox
  • Example 49 The luminaire of any of the preceding examples or combination of examples, wherein the reflective surface is a curved surface of the reflector, the curved surface comprising at least one of: a concave shape; a parabolic shape extending from the base toward and beyond the optical axis of the one of the plurality of LEDs; or a free form shape characterized by multiple curvatures between end points of the curved surface, a first end point being at the base and a second end point being positioned above at least some of the plurality of lenses.
  • the reflective surface is a curved surface of the reflector, the curved surface comprising at least one of: a concave shape; a parabolic shape extending from the base toward and beyond the optical axis of the one of the plurality of LEDs; or a free form shape characterized by multiple curvatures between end points of the curved surface, a first end point being at the base and a second end point being positioned above at least some of the plurality of lenses.
  • Example 50 An optical assembly comprising: a base comprising a first surface; a plurality of lenses provided on the first surface of the base, each lens having a dome shape having a central axis perpendicular to a plane of the base; a plurality of light emitting diodes (LED), each LED positioned to emit light into a respective lens of the plurality of lenses, each LED having a central axis perpendicular to a plane of the LED, the central axis of an LED being offset from the central axis of the respective lens of the plurality of lenses; and at least one reflector extending from the base and having a curved surface, the at least one reflector being disposed adjacent to at least one of the plurality of LEDs such that the at least one of the plurality of LEDs is at a first side of the at least one reflector, the curved surface extending from the base and curving over the at least one of the plurality of LEDs and beyond the central axis of the at least one of the plurality of LEDs, the curved
  • Example 51 The optical assembly of any of the preceding or subsequent examples or combination of examples, wherein each lens of the plurality of lenses defines a cavity, and each LED of the plurality of LEDs is disposed in the cavity of the respective lens such that the central axis of the LED is offset relative to a central axis of the respective lens in a direction toward the curved surface of the at least one reflector.
  • Example 52 The optical assembly of any of the preceding or subsequent examples or combination of examples, wherein the curved surface of the reflector has at least one of: a concave shape; a parabolic shape extending from the base toward and beyond the central axis of the at least one of the plurality of LEDs; or a free form shape characterized by multiple curvatures between end points of the curved surface, a first end point being at the base and a second end point being positioned above at least some of the plurality of lenses.
  • Example 53 The optical assembly of any of the preceding or subsequent examples or combination of examples, wherein the free form shape comprises: a first curvature between the first end point at the base and an intermediate point between the first end point and the second end point; and a second curvature between the intermediate point and the second end point of the curved surface.
  • Example 54 The optical assembly of any of the preceding or subsequent examples or combination of examples, wherein the curved surface of the reflector is characterized by at least one of: a first angle between a first line and a plane of the base, the first line joining a distal end of a lens furthest laterally from the reflector at the base and a distal end of the reflector located over the lens, and a second angle between a second line and the plane of the base, the second line joining a point on the lens located at the central axis of the LED and the distal end of the reflector located over the lens.
  • Example 55 The optical assembly of any of the preceding or subsequent examples or combination of examples, wherein the first angle is in a range between 60° and 90° or wherein the second angle is in a range between 70° and 130°.
  • Example 56 The optical assembly of any of the preceding or subsequent examples or combination of examples, wherein the first surface of the base is configured to absorb at least 90% of emitted light incident on the first surface.
  • Example 57 The optical assembly of any of the preceding or subsequent examples or combination of examples, wherein the first surface of the base comprises a light absorbing material or coating.
  • Example 58 The optical assembly of any of the preceding or subsequent examples or combination of examples, wherein the base further comprises a second surface opposite the first surface and a plurality of apertures extending through the base from the first surface to the second surface, wherein each of the plurality of lenses extends at least partially through a respective one of the plurality of apertures so as to be provided on the first surface of the base.
  • Example 59 The optical assembly of any of the preceding or subsequent examples or combination of examples, wherein the plurality of lenses is attached to the base with an adhesive.
  • Example 60 The optical assembly of any of the preceding or subsequent examples or combination of examples, wherein: the plurality of lenses comprises a first plurality of lenses arranged in a first row and a second plurality of lenses arranged in a second row; and the plurality of LEDs comprises a first plurality of LEDs disposed in the first plurality of lenses and a second plurality of LEDs disposed in the second plurality of lenses.
  • Example 61 The optical assembly of any of the preceding or subsequent examples or combination of examples, wherein the at least one reflector comprises: a first reflector disposed proximate to the first plurality of lenses such that a curved surface of the first reflector extends over the first plurality of lenses; and a second reflector disposed between the first plurality of lenses and the second plurality of lenses such that a curved surface of the second reflector extends over the second plurality of lenses.
  • Example 62 The optical assembly of any of the preceding or subsequent examples or combination of examples, wherein the at least one reflector extends along a single lens of the plurality of lenses.
  • Example 63 The optical assembly of any of the preceding or subsequent examples or combination of examples, wherein: the at least one reflector has an angular shape comprising a first curved surface portion, a second curved surface portion disposed at an angle with the first curved surface portion, and a corner portion between the first curved surface portion and the second curved surface portion, the corner portion having a curved surface extending along multiple axes; the curved surface of the corner portion of the at least one reflector curves between the first curved surface portion and the second curved surface portion, and also curves in a plane perpendicular to the base; and a lens of the plurality of lenses is located at the corner such that the curved surface of the corner portion curves at least partially over the lens.
  • Example 64 A luminaire configured to illuminate a selected area and comprising: the optical assembly of any preceding claim; and a frame supporting the optical assembly, the frame being oriented such that the curved surface of the at least one reflector curves toward the selected area to direct the light from the at least one of the plurality of LEDs toward the selected area and prevent light from leaking in a direction that is away from the selected area.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Lenses (AREA)
  • Securing Globes, Refractors, Reflectors Or The Like (AREA)
EP23160000.8A 2022-03-04 2023-03-03 Optique de commande de faisceau de coupure extrême Pending EP4239244A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US17/686,799 US11746989B1 (en) 2022-03-04 2022-03-04 Extreme cutoff beam control optics
US202263356130P 2022-06-28 2022-06-28

Publications (1)

Publication Number Publication Date
EP4239244A1 true EP4239244A1 (fr) 2023-09-06

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CA (1) CA3191948A1 (fr)
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1988576A1 (fr) * 2007-05-03 2008-11-05 Ruud Lighting, Inc. Élément de protection dans appareil à DEL
CA2630114A1 (fr) * 2008-04-29 2009-10-29 Michael R. Pearse Deflecteur del
US20140063802A1 (en) * 2012-08-31 2014-03-06 Koninklijke Philips Electronics N.V. Optical System for LEDs for Controlling Light Utilizing Reflectors
US10168023B1 (en) * 2015-10-28 2019-01-01 NLS Lighting, LLC Reflector based illumination system
WO2019215265A1 (fr) * 2018-05-08 2019-11-14 Schreder S.A. Appareil d'éclairage vers le bas et mât d'éclairage comprenant un module de poteau lumineux associé

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1988576A1 (fr) * 2007-05-03 2008-11-05 Ruud Lighting, Inc. Élément de protection dans appareil à DEL
CA2630114A1 (fr) * 2008-04-29 2009-10-29 Michael R. Pearse Deflecteur del
US20140063802A1 (en) * 2012-08-31 2014-03-06 Koninklijke Philips Electronics N.V. Optical System for LEDs for Controlling Light Utilizing Reflectors
US10168023B1 (en) * 2015-10-28 2019-01-01 NLS Lighting, LLC Reflector based illumination system
WO2019215265A1 (fr) * 2018-05-08 2019-11-14 Schreder S.A. Appareil d'éclairage vers le bas et mât d'éclairage comprenant un module de poteau lumineux associé

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MX2023002668A (es) 2023-09-05

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